Lithium battery

Abstract

The utility model discloses a lithium battery, which relates to the technical field of lithium batteries and comprises a lithium battery body, the top of the lithium battery body is provided with a cap, the interior of the cap is slidably connected with a telescopic cap, the bottom of the telescopic cap is provided with a circular groove, and the interior of the circular groove is slidably fitted with an electric contact block. A second spring is fixedly connected between the electric contact block and the inner wall of the circular groove, an electric contact piece is connected to the top end of the lithium battery body, the electric contact block is matched with the electric contact piece, a circular ring is fixedly connected to the top end of the telescopic cap, and a pull plate is fixedly connected to the circular ring and is in an L shape. According to the lithium battery, the telescopic cap, the cap cover and other structures are arranged, and the telescopic cap is recycled towards the interior of the cap cover, so that the lithium battery can be conveniently mounted in a battery holder, and abrasion in the mounting process is reduced; meanwhile, one end of the positive electrode of the lithium battery can be taken out from the battery holder by pulling the pulling plate, so that the whole lithium battery can be taken out quickly.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, and particularly relates to a lithium battery. Background Art

[0002] A lithium battery refers to a battery containing lithium (including metallic lithium, lithium alloy, lithium ion, and lithium polymer) in an electrochemical system. Lithium batteries usually have two shapes: cylindrical and square. The battery internally adopts a spiral winding structure, and a very fine and highly permeable polyethylene film isolation material is used to separate the positive and negative electrodes. The positive electrode includes a current collector composed of lithium cobaltate (or lithium nickel cobalt manganese oxide, lithium manganate, lithium iron phosphate, etc.) and aluminum foil. The negative electrode consists of a current collector composed of graphitized carbon material and copper foil. The battery is filled with an organic electrolyte solution. In addition, a safety valve and a PTC component (used in some cylindrical types) are also installed to protect the battery from damage when the battery is in an abnormal state or the output is short-circuited. The voltage of a single lithium battery is 3.7V (3.2V for the one with lithium iron phosphate positive electrode), and the battery capacity cannot be infinitely large. Therefore, single lithium batteries are often connected in series and parallel to meet the requirements of different occasions.

[0003] When the existing cylindrical lithium battery is installed and used, it is usually pressed into the battery holder by force, and the positive electrode of the lithium battery is easily worn, which is likely to cause poor contact.

[0004] Therefore, it is necessary to propose a lithium battery to solve the above problems. Content of the Utility Model

[0005] The purpose of the utility model is to provide a lithium battery to solve the problem that when the existing cylindrical lithium battery is installed and used, it is usually pressed into the battery holder by force, and the positive electrode of the lithium battery is easily worn, which is likely to cause poor contact.

[0006] To achieve the above purpose, the utility model provides the following technical solution: A lithium battery includes a lithium battery body. A cap is arranged at the top of the lithium battery body. An expansion cap is slidably connected inside the cap. A circular groove is opened at the bottom of the expansion cap. An electric contact block is slidably fitted inside the circular groove. A second spring is fixedly connected between the electric contact block and the inner wall of the circular groove. An electric contact piece is connected to the top end of the lithium battery body. The electric contact block cooperates with the electric contact piece. A circular ring is fixedly connected to the top end of the expansion cap. A pull plate is fixedly connected to the circular ring, and the pull plate is L-shaped.

[0007] Preferably, sliding grooves are opened on both sides of the inner wall of the cap. Sliding blocks are slidably connected inside the sliding grooves. The sliding blocks are fixedly connected to the expansion cap.

[0008] Preferably, a first spring is fixedly connected to the upper surface of the sliding block. The top of the first spring is fixedly connected to the inner wall of the sliding groove.

[0009] Preferably, the electrical contact block includes a lower contact block, a middle contact block, an upper contact block, and a sliding part. The lower contact block, the middle contact block, the upper contact block, and the sliding part are arranged from bottom to top, and the outer diameters of the lower contact block, the middle contact block, the upper contact block, and the sliding part increase in sequence.

[0010] Preferably, the outer walls of the lower contact block, the middle contact block, and the upper contact block are arc-shaped, and the sliding part is cylindrical.

[0011] The technical effects and advantages of the present utility model are as follows:

[0012] 1. By providing structures such as a telescopic cap and a cap, the telescopic cap retracts into the interior of the cap, facilitating the installation of the lithium battery into the battery holder and reducing wear during the installation process. At the same time, by pulling the pull plate, the positive electrode end of the lithium battery can be taken out from the battery holder first, and then the entire lithium battery can be quickly taken out.

[0013] 2. The electrical contact block of the present utility model includes a lower contact block, a middle contact block, an upper contact block, and a sliding part, and the lower contact block is thinner than other parts. When the lithium battery has a short circuit, the thinner part generates more Joule heat and will fuse and disconnect the circuit first, thereby improving the safety of the lithium battery. Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of the lithium battery of the present utility model.

[0015] Figure 2 It is a schematic cross-sectional structural diagram of the lithium battery of the present utility model.

[0016] Figure 3 For the present utility model Figure 2 The enlarged schematic diagram of the structure at A.

[0017] Figure 4 It is a schematic structural diagram of the electrical contact block of the present utility model.

[0018] In the figure: 1. Lithium battery body; 2. Cap; 3. Telescopic cap; 4. Slide groove; 5. Slide block; 6. Electrical contact piece; 7. Electrical contact block; 8. Lower contact block; 9. Middle contact block; 10. Upper contact block; 11. Ring; 12. Pull plate; 13. First spring; 14. Sliding part; 15. Circular groove; 16. Second spring. Detailed Embodiment

[0019] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0020] The present utility model provides a lithium battery as shown in Figures 1 to 4 Figure 5. The lithium battery includes a lithium battery body 1. Inside the lithium battery body 1, there are battery cells, electrolyte solution, etc. Its internal structure and working principle are common existing technologies and will not be elaborated here. And this lithium battery is in a cylindrical structure, and its dimensions are: diameter 18.0 mm to 20 mm, battery length: 66 mm to 75 mm.

[0021] Considering that when the lithium battery is installed and used, it is usually pressed hard into the battery holder by squeezing, and the positive electrode is extremely vulnerable to wear. To avoid the occurrence of wear, a cap 2 is provided at the top of the lithium battery body 1. Inside the cap 2, a telescopic cap 3 is slidably connected. The telescopic cap 3 retracts into the cap 2, which is convenient for installing the lithium battery into the battery holder and reducing wear during the installation process. After installation, the telescopic cap 3 extends out of the cap 2 to ensure normal electrical connection.

[0022] To improve the sliding stability of the telescopic cap 3, sliding grooves 4 are provided on both sides of the inner wall of the cap 2. Inside the sliding grooves 4, sliding blocks 5 are slidably connected. The sliding blocks 5 are fixedly connected to the telescopic cap 3.

[0023] To achieve the reset of the telescopic cap 3, a first spring 13 is fixedly connected to the upper surface of the sliding block 5. The top of the first spring 13 is fixedly connected to the inner wall of the sliding groove 4. When the telescopic cap 3 retracts into the cap 2, it will squeeze the first spring 13 to contract. After the lithium battery is pressed into the battery holder, the reset elastic force of the first spring 13 causes the telescopic cap 3 to reset and extend to ensure normal electrical contact.

[0024] A circular groove 15 is provided at the bottom of the telescopic cap 3. Inside the circular groove 15, an electrical contact block 7 is slidably fitted. A second spring 16 is fixedly connected between the electrical contact block 7 and the inner wall of the circular groove 15. The inner wall of the circular groove 15 and the top end of the electrical contact block 7 are both circular to ensure sufficient cross-sectional area. An electrical contact piece 6 is connected to the top end of the lithium battery body 1. The electrical contact block 7 cooperates with the electrical contact piece 6. The electrical contact piece 6 is the positive electrode part of the lithium battery body 1. The electrical contact block 7 is fitted on the inner wall of the circular groove 15, and the electrical contact block 7 is in contact and cooperation with the electrical contact piece 6 to ensure electrical connection between them.

[0025] Considering that when an existing lithium battery is taken out of the battery holder, it is usually triggered by an operator's finger, with low efficiency. A ring 11 is fixedly connected to the top end of the telescopic cap 3, and a pull plate 12 is fixedly connected to the ring 11. The pull plate 12 is L-shaped. The operator can pull the pull plate 12 to first take out the positive electrode end of the lithium battery from the battery holder, and then quickly take out the entire lithium battery; during the taking-out process, the telescopic cap 3 will adaptively slide into the cap 2.

[0026] Considering that the positive electrode tab of an existing lithium battery has the same thickness in the axial length direction, when a short circuit occurs outside the battery, the tab cannot melt, so the short circuit continues to occur, causing the battery to continuously heat up and even catch fire and explode. The electric contact block 7 of the present invention includes a lower contact block 8, a middle contact block 9, an upper contact block 10, and a sliding portion 14. The lower contact block 8, the middle contact block 9, the upper contact block 10, and the sliding portion 14 are arranged from bottom to top, and the outer diameters of the lower contact block 8, the middle contact block 9, the upper contact block 10, and the sliding portion 14 gradually increase.

[0027] The lower contact block 8 is thinner than other parts. When a short circuit occurs in the lithium battery, the thinner part generates more Joule heat and will melt and disconnect the circuit first, thereby improving the safety of the lithium battery.

[0028] The outer walls of the lower contact block 8, the middle contact block 9, and the upper contact block 10 are arc-shaped, and the sliding portion 14 is cylindrical. Since the telescopic movement of the telescopic cap 3 will squeeze the electric contact block 7, and the outer walls of the lower contact block 8, the middle contact block 9, and the upper contact block 10 are arc-shaped, stress concentration will not occur, thereby improving the service life.

Claims

1. A lithium battery, comprising a lithium battery body (1), characterized in that: The top of the lithium battery body (1) is provided with a cap (2), the interior of the cap (2) is slidably connected to a telescopic cap (3), the bottom of the telescopic cap (3) is provided with a circular groove (15), the interior of the circular groove (15) is slidably fitted with an electric contact block (7), a second spring (16) is fixedly connected between the electric contact block (7) and the inner wall of the circular groove (15), the top of the lithium battery body (1) is connected to an electric contact sheet (6), the electric contact block (7) cooperates with the electric contact sheet (6), the top of the telescopic cap (3) is fixedly connected to a circular ring (11), the circular ring (11) is fixedly connected to a pull plate (12), and the pull plate (12) is L-shaped.

2. A lithium battery according to claim 1, characterized in that: Slide grooves (4) are provided on both sides of the inner wall of the cap (2), and a slider (5) is slidably connected inside the slide groove (4), and the slider (5) is fixedly connected to the telescopic cap (3).

3. A lithium battery according to claim 2, characterized in that: A first spring (13) is fixedly connected to the upper surface of the sliding block (5), and the top of the first spring (13) is fixedly connected to the inner wall of the sliding groove (4).

4. A lithium battery according to claim 1, characterized in that: The electric contact block (7) comprises a contact block lower portion (8), a contact block middle portion (9), a contact block upper portion (10) and a sliding portion (14); the contact block lower portion (8), the contact block middle portion (9), the contact block upper portion (10) and the sliding portion (14) are arranged from bottom to top, and the outer diameters of the contact block lower portion (8), the contact block middle portion (9), the contact block upper portion (10) and the sliding portion (14) increase in sequence.

5. A lithium battery according to claim 4, characterized in that: The outer walls of the contact block lower part (8), the contact block middle part (9) and the contact block upper part (10) are in an arc shape, and the sliding part (14) is in a cylindrical shape.

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