Rechargeable lithium battery for electric tool

Abstract

The utility model provides a rechargeable lithium battery for an electric tool, and relates to the technical field of lithium batteries. Comprising a lithium battery body, a reinforcing shell is detachably arranged on the outer side of the lithium battery body, the reinforcing shell is a frame body wrapping the periphery of the lithium battery body, an end cover is arranged on one side of the reinforcing shell, heat dissipation grooves are evenly formed in the two sides of the reinforcing shell, and fixing holes are symmetrically formed in the two sides, adjacent to the heat dissipation grooves, of the reinforcing shell. A fixing insertion piece is arranged under the fixing hole, and the fixing insertion piece is fixedly connected with the reinforcing shell. The lithium battery solves the problems that the existing lithium battery is easy to damage and bend, and a plurality of lithium batteries are directly wound and wrapped by an aluminum-plastic composite film when being combined for use, so that the disassembly and assembly are not changed, and the heat dissipation is influenced.

Description

Technical Field

[0001] The utility model provides a rechargeable lithium battery for power tools, relating to the technical field of lithium batteries. Background Art

[0002] With the progress and development of technology, lithium batteries are currently an essential new energy source in various fields of the national economy and have been widely used in electric vehicles, electric bicycles, mobile phones, laptop computers, aerospace, military and other fields. According to the different electrolyte materials used in lithium-ion batteries, lithium-ion batteries are divided into liquid lithium-ion batteries and polymer lithium-ion batteries or plastic lithium-ion batteries. The positive and negative electrode materials used in polymer lithium-ion batteries are the same as those in liquid lithium-ion batteries. The positive electrode materials are divided into lithium cobaltate, lithium manganate, ternary materials and lithium iron phosphate materials, and the negative electrode is graphite. The battery working principles are also basically the same. Their main difference lies in the different electrolytes. Liquid lithium-ion batteries use liquid electrolytes, while polymer lithium-ion batteries use solid polymer electrolytes instead. This polymer can be "dry" or "colloidal", and currently most use polymer gel electrolytes.

[0003] In the transportation of existing polymer lithium batteries, due to bumps and squeezes, the batteries collide with each other, resulting in damage and a certain degree of bending of the lithium batteries, making the lithium batteries unable to be used normally. In addition, when existing polymer lithium batteries are used in combination, they are usually directly bundled together and then wrapped with an aluminum-plastic composite film. This method not only makes it inconvenient to disassemble and assemble the polymer lithium batteries, but also the heat dissipated between individual lithium batteries during operation is transmitted to each other, resulting in heat accumulation and posing a risk of high-temperature spontaneous combustion. For this reason, we propose a rechargeable lithium battery for power tools. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is that existing lithium batteries are prone to damage and bending, and when multiple lithium batteries are used in combination, they are directly wrapped with an aluminum-plastic composite film, resulting in inconvenient disassembly and assembly and affecting heat dissipation.

[0005] To solve the above technical problems, the technical solution provided by the utility model is: a rechargeable lithium battery for power tools, including a lithium battery body. A reinforcing outer shell is detachably arranged on the outer side of the lithium battery body. The reinforcing outer shell is a frame body that wraps around the lithium battery body on all sides and is provided with an end cover on one side. Heat dissipation grooves are evenly opened on both sides of the reinforcing outer shell. Fixing holes are symmetrically opened on both sides of the reinforcing outer shell adjacent to the heat dissipation grooves. A fixing insert is arranged directly below the fixing hole, and the fixing insert is fixedly connected to the reinforcing outer shell.

[0006] Preferably, the fixing hole includes an insertion section, a transition section and a limiting section. The transition section is connected between the insertion section and the limiting section. A convex block that cooperates with the limiting section is fixedly connected to the inner side of the fixing insert.

[0007] Preferably, one side of the top of the reinforcement housing is fixedly connected with a first heat dissipation fin, and the other side is fixedly connected with a second heat dissipation fin. One side of the bottom of the reinforcement housing is fixedly connected with a third heat dissipation fin, and the other side is fixedly connected with a fourth heat dissipation fin.

[0008] Preferably, an opening adapted to the end cover is provided on one side of the reinforcement housing. The end cover is fixedly connected to the inner side of the opening by bolts, and a sealing ring is fixedly connected to the outer side of the end cover in the circumferential direction. A sealing groove adapted to the sealing ring is formed on the inner side of the opening.

[0009] Preferably, the first heat dissipation fin, the second heat dissipation fin, the third heat dissipation fin and the fourth heat dissipation fin each include a heat conduction plate and heat dissipation fins vertically fixedly connected to the heat conduction plate. The heat conduction plate is fixedly connected to the inner side of the reinforcement housing and closely adheres to the outer surface of the lithium battery body.

[0010] Preferably, a limiting step is provided at the top of the heat dissipation fin, and the directions of the limiting steps of the first heat dissipation fin and the second heat dissipation fin are opposite, the directions of the limiting steps of the third heat dissipation fin and the fourth heat dissipation fin are opposite, the directions of the limiting steps of the first heat dissipation fin and the third heat dissipation fin are opposite, and the directions of the limiting steps of the second heat dissipation fin and the fourth heat dissipation fin are opposite.

[0011] Advantages of the present utility model:

[0012] Through the arrangement of the reinforcement housing, the strength of the lithium battery body is enhanced, and the situation that the lithium battery body is damaged and bent, resulting in the inability to use the lithium battery body normally, is avoided.

[0013] Through the arrangement of the fixing holes and the fixing inserts, when multiple lithium battery bodies are used in combination, two adjacent reinforcement housings can be fixed together, which is more convenient for disassembly and assembly compared with the traditional method of winding and wrapping with an aluminum plastic film.

[0014] Through the arrangement of the heat conduction plate, the heat dissipation fins and the heat dissipation grooves, when multiple lithium battery bodies are used in combination, gaps and heat dissipation channels can be formed between the lithium battery bodies for heat dissipation, and the heat dissipation effect is better compared with the traditional form of being closely attached together. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of a rechargeable lithium battery for an electric tool according to the present utility model.

[0016] Figure 2 It is a schematic diagram of the fixing hole structure of a rechargeable lithium battery for an electric tool according to the present utility model.

[0017] Figure 3 It is a bottom view of a rechargeable lithium battery for an electric tool according to the present utility model.

[0018] Figure 4 The front view of heat dissipation fins 1, 2, 3, and 4 of a rechargeable lithium battery for an electric tool according to the present utility model.

[0019] Figure 5 Schematic diagram of the usage state of multiple lithium batteries of a rechargeable lithium battery for an electric tool according to the present utility model. (1. Reinforcing shell; 2. Fixing hole; 3. Fixing insert; 4. End cover; 5. Lithium battery body; 6. Heat dissipation fin 1; 7. Heat dissipation fin 2; 8. Heat dissipation groove; 9. Transition section; 10. Limiting section; 11. Insertion section; 12. Heat dissipation fin 3; 13. Heat dissipation fin 4; 14. Protrusion; 15. Heat dissipation fin; 16. Limiting step; 17. Heat conduction plate) Specific embodiments

[0020] The preferred embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.

[0021] Referring to Figures 1 to 5 , the present utility model provides a rechargeable lithium battery for an electric tool, including a lithium battery body 5. A reinforcing shell 1 is detachably arranged outside the lithium battery body 5. The reinforcing shell 1 is a frame surrounding the lithium battery body 5 on all sides, and an end cover 4 is arranged on one side. An opening is provided on one side of the reinforcing shell 1 and is matched with the end cover 4. The end cover 4 is fixedly connected to the inner side of the opening by bolts, and a sealing ring is fixedly connected to the outer side of the end cover 4 in a circumferential direction. A sealing groove matched with the sealing ring is opened on the inner side of the opening. Specifically, through the arrangement of the reinforcing shell 1, the strength of the lithium battery body 5 is enhanced, avoiding the situation that the lithium battery body 5 is damaged and bent, resulting in the lithium battery body 5 being unable to be used normally.

[0022] Furthermore, as shown in Figure 1 and Figure 3 , heat dissipation grooves 8 are evenly opened on both sides of the reinforcing shell 1. On one side of the top of the reinforcing shell 1, a heat dissipation fin 1 6 is fixedly connected, and on the other side, a heat dissipation fin 2 7 is fixedly connected. On one side of the bottom of the reinforcing shell 1, a heat dissipation fin 3 12 is fixedly connected, and on the other side, a heat dissipation fin 4 13 is fixedly connected. The heat dissipation fins 1 6, 2 7, 3 12, and 4 13 all include a heat conduction plate 17 and heat dissipation fins 15 vertically fixedly connected to the heat conduction plate 17. The heat conduction plate 17 is fixedly connected to the inner side of the reinforcing shell 1, and the heat conduction plate 17 is closely attached to the outer surface of the lithium battery body 5. Specifically, by closely attaching the heat conduction plate 17 to the lithium battery body 5, the heat of the lithium battery body 5 can be transferred to the heat dissipation fins 15, and then dissipated outward through the heat dissipation fins 15, thereby dissipating heat from the lithium battery body 5. The positions of the heat dissipation grooves 8 and the heat dissipation fins 15 are staggered, so as to form a through airflow channel between the heat dissipation fins 15, which can improve the heat dissipation effect.

[0023] Furthermore, as shown in Figure 1 and Figure 2As shown in the figure, fixing holes 2 are symmetrically opened on two sides of the reinforced outer shell 1 adjacent to the heat dissipation grooves 8. A fixing insert 3 is arranged directly below the fixing hole 2, and the fixing insert 3 is fixedly connected to the reinforced outer shell 1. The fixing hole 2 includes an insertion section 11, a transition section 9, and a limiting section 10. The transition section 9 is connected between the insertion section 11 and the limiting section 10. A convex block 14 that cooperates with the limiting section 10 is fixedly connected to the inner side of the fixing insert 3. Specifically, when multiple lithium battery bodies 5 are used in combination, the fixing inserts 3 of two adjacent lithium battery bodies 5 can be aligned with the insertion section 11 of the fixing hole 2 and inserted, and then pulled towards the transition section 9. Apply a certain external force to slide the convex block 14 into the limiting section 10, so as to connect two adjacent reinforced outer shells 1 together.

[0024] Furthermore, as Figure 4 shown in the figure, a limiting step 16 is provided at the top of the heat sink 15, and the directions of the limiting steps 16 of the first heat dissipation fin 6 and the second heat dissipation fin 7 are opposite, the directions of the limiting steps 16 of the third heat dissipation fin 12 and the fourth heat dissipation fin 13 are opposite, the directions of the limiting steps 16 of the first heat dissipation fin 6 and the third heat dissipation fin 12 are opposite, and the directions of the limiting steps 16 of the second heat dissipation fin 7 and the fourth heat dissipation fin 13 are opposite. Specifically, when multiple lithium battery bodies 5 are used in combination, after the reinforced outer shells 1 are fixed together through the cooperation of the fixing holes 2 and the fixing inserts 3, the upper and lower and left and right heat sinks 15 are clamped together through the limiting steps 16, and because the directions of the limiting steps 16 are different, the left and right movement of two adjacent reinforced outer shells 1 in the up and down direction is limited.

[0025] Working principle: The lithium battery body 5 is placed into the reinforced outer shell 1 through the opening, the end cover 4 is covered, and then fixed by bolts. The strength of the lithium battery body 5 is enhanced through the reinforced outer shell 1, so as to avoid damage and deformation of the lithium battery body 5; when multiple lithium battery bodies 5 need to be used in combination, the fixing insert 3 is aligned with the insertion section 11 of the fixing hole 2 and inserted, and then pulled towards the transition section 9. Apply a certain external force to slide the convex block 14 into the limiting section 10, so as to connect two adjacent reinforced outer shells 1 together. At this time, gaps and heat dissipation channels can be formed between two adjacent reinforced outer shells 1 under the action of the heat sinks 15 and the heat dissipation grooves 8, so as to ensure the heat dissipation effect.

[0026] The above describes the present invention and its implementation manners. This description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present invention, and the actual structure is not limited thereto. All in all, if those of ordinary skill in the art are inspired by it and design similar structural manners and embodiments without creative work without departing from the creative purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A rechargeable lithium battery for an electric tool, comprising a lithium battery body, characterized in that: A reinforced shell is detachably provided on the outside of the lithium battery body. The reinforced shell is a frame wrapped around the lithium battery body and is provided with an end cover on one side. Heat dissipation grooves are evenly provided on both sides of the reinforced shell. Fixing holes are symmetrically provided on both sides of the reinforced shell adjacent to the heat dissipation grooves. A fixing plug is provided directly below the fixing hole, and the fixing plug is fixedly connected to the reinforced shell.

2. A rechargeable lithium battery for an electric tool according to claim 1, characterized in that: The fixing hole comprises an insertion section, a transition section and a limiting section, wherein the transition section is connected between the insertion section and the limiting section, and a protrusion matched with the limiting section is fixedly connected to the inner side of the fixing insert.

3. A rechargeable lithium battery for an electric tool according to claim 1, characterized in that: One side of the top of the reinforced shell is fixedly connected with a first heat sink fin and the other side is fixedly connected with a second heat sink fin. One side of the bottom of the reinforced shell is fixedly connected with a third heat sink fin and the other side is fixedly connected with a fourth heat sink fin.

4. A rechargeable lithium battery for an electric tool according to claim 1, characterized in that: An opening matching with the end cover is provided on one side of the reinforced shell, the end cover is fixedly connected to the inner side of the opening by bolts, and a sealing ring is fixedly connected to the outer side of the end cover around the circumference, and a sealing groove matching with the sealing ring is provided on the inner side of the opening.

5. The rechargeable lithium battery for electric tools according to claim 3, characterized in that: The heat dissipation fins 1, 2, 3 and 4 all include a heat conduction plate and a heat sink vertically fixed on the heat conduction plate. The heat conduction plate is fixed on the inner side of the reinforced shell, and the heat conduction plate is closely attached to the outer surface of the lithium battery body.

6. A rechargeable lithium battery for an electric tool according to claim 5, characterized in that: A limiting step is provided on the top of the heat sink, and the limiting steps of heat sink fin one and heat sink fin two are in opposite directions, the limiting steps of heat sink fin three and heat sink fin four are in opposite directions, the limiting steps of heat sink fin one and heat sink fin three are in opposite directions, and the limiting steps of heat sink fin two and heat sink four are in opposite directions.

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