Waterproof lithium battery

Abstract

The utility model belongs to the battery packaging technical field, concretely relates to a waterproof lithium battery, including the waterproof case of encapsulation lithium battery, a plurality of conical heat conduction plates are fixed with the bottom plate array of waterproof case, the waterproof case inside detachably is equipped with the heat absorption plate, the heat absorption plate bottom integrative has with the multiple groups of convex ball array corresponding with conical heat conduction plate, the convex ball array with conical heat conduction plate top surface is pasted, the waterproof case is fixedly connected with the frame board along the bottom periphery, the sidewall of frame board all is opened in the ventilation groove, the utility model discloses through the heat absorption plate absorption lithium battery generates the heat, and through the convex ball array will heat efficient conduction to conical heat conduction plate, combines the circulating air of ventilation groove introduction and accelerates the heat of conical heat conduction plate to dissipate, forms " absorption - conduction - diffusion - discharge " closed loop heat radiation path, and the waterproof sealing property and heat dissipation efficiency are given full play to.

Description

Technical Field

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

[0002] Lithium batteries, typically referring to lithium-ion batteries, are rechargeable batteries that store and release electrical energy by moving lithium ions between the positive and negative electrodes. Waterproofing lithium batteries requires a multi-layered protective design to ensure their waterproof performance, and various waterproofing methods are available, such as heat-shrink film, epoxy resin potting, and high-performance plastics. In some industrial applications (such as watercraft and electric vehicles), sealed stainless steel metal cases are used to encase lithium batteries for even better waterproofing.

[0003] Currently, stainless steel sealed enclosures used for waterproof protection of lithium batteries generally adopt a fully welded sealed structure without heat dissipation holes in order to meet the IP68 protection level requirements. They rely solely on the thermal conductivity of stainless steel itself (thermal conductivity 16W / mK), which means that the heat generated by high-power battery packs cannot be dissipated in time. Long-term high-temperature environments will cause lithium battery capacity decay. Therefore, how to improve heat dissipation efficiency while ensuring waterproof sealing has become a technical problem that urgently needs to be solved in this field. Utility Model Content

[0004] The purpose of this invention is to provide a waterproof lithium battery that absorbs the heat generated by the lithium battery through a heat-absorbing plate and efficiently conducts the heat to a conical heat-conducting plate through a convex ball array. Combined with the airflow introduced by the ventilation slots, the heat of the conical heat-conducting plate is dissipated more quickly, forming a closed-loop heat dissipation path of "absorption-conduction-diffusion-emission", which takes into account both waterproof sealing and heat dissipation efficiency.

[0005] The specific technical solution adopted by this utility model is as follows:

[0006] A waterproof lithium battery includes a waterproof case for encapsulating the lithium battery. The bottom plate of the waterproof case is fixed with a plurality of conical heat-conducting plates. A heat-absorbing plate is detachably provided inside the waterproof case. The bottom of the heat-absorbing plate is integrally formed with a plurality of sets of convex ball arrays corresponding to the conical heat-conducting plates. The convex ball arrays are in contact with the top surface of the conical heat-conducting plates. A frame plate is fixedly connected to the bottom periphery of the waterproof case. Ventilation slots are provided through the side walls of the frame plate.

[0007] The conical surface of the conical heat-conducting plate is coated with a transparent anti-corrosion paint, and the top of the conical heat-conducting plate is coated with thermal grease.

[0008] The gaps between the convex ball arrays are provided with support columns, and countersunk bolts are movably embedded in the center of the support columns. The inner wall of the bottom plate of the waterproof box is provided with threaded grooves for the countersunk bolts to be screwed in.

[0009] The vertical height of the support column is adapted to the height of the convex spherical array.

[0010] The bottom of the frame plate has water-permeable holes.

[0011] The technical effect achieved by this utility model is as follows: the heat generated by the lithium battery is absorbed by the heat-absorbing plate, and the heat is efficiently conducted to the conical heat-conducting plate by the convex ball array. Combined with the airflow introduced by the ventilation slot, the heat of the conical heat-conducting plate is dissipated more quickly, forming a closed-loop heat dissipation path of "absorption-conduction-diffusion-emission", which takes into account both waterproof sealing and heat dissipation efficiency. Attached Figure Description

[0012] Figure 1 This is an overall view of the waterproof box provided in an embodiment of this utility model;

[0013] Figure 2 This is a bottom view of the structure of the waterproof box provided in an embodiment of this utility model;

[0014] Figure 3 This is an exploded view of the waterproof box provided in an embodiment of this utility model;

[0015] Figure 4 yes Figure 3 A magnified view of a section at point A in the middle;

[0016] Figure 5 This is an exploded bottom view of the waterproof box provided in an embodiment of this utility model;

[0017] Figure 6 yes Figure 5 A magnified view of a section at point B.

[0018] The attached diagram lists the components represented by each number as follows:

[0019] 1. Waterproof box; 101. Conical heat-conducting plate; 102. Heat-absorbing plate; 103. Convex spherical array; 104. Support column; 105. Countersunk bolt; 106. Frame plate; 107. Ventilation slot; 108. Water-permeable hole. Detailed Implementation

[0020] To make the objectives and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of this utility model and does not strictly limit the scope of protection specifically claimed by this utility model.

[0021] like Figures 1-6As shown, a waterproof lithium battery includes a waterproof case 1 for encapsulating the lithium battery. A plurality of conical heat-conducting plates 101 are fixedly arranged on the bottom plate of the waterproof case 1. The conical surfaces of the conical heat-conducting plates 101 are coated with a transparent anti-corrosion paint. A heat-absorbing plate 102 is detachably installed inside the waterproof case 1. Multiple sets of convex ball arrays 103 corresponding to the conical heat-conducting plates 101 are integrally formed on the bottom of the heat-absorbing plate 102. Support columns 104 are provided at the gaps between the convex ball arrays 103, and a countersunk head is movably embedded in the center of each support column 104. Bolt 105, the inner wall of the bottom plate of the waterproof box 1 is provided with a threaded groove for the countersunk bolt 105 to be screwed in, the vertical height of the support column 104 is adapted to the height of the convex ball array 103, the top of the conical heat-conducting plate 101 is coated with thermal grease, the convex ball array 103 is attached to the top surface of the conical heat-conducting plate 101, the waterproof box 1 is fixedly connected to the bottom periphery of the frame plate 106, the side walls of the frame plate 106 are provided with ventilation slots 107, and the bottom of the frame plate 106 is provided with water-permeable holes 108.

[0022] According to the above structure, the waterproof box 1 and the conical heat-conducting plate 101 can be connected and fixed by means of, but not limited to, ultrasonic welding of filler nickel foil, brazing + peripheral bonding, etc., to maintain sealing and firmness. The conical heat-conducting plate 101 and the heat-absorbing plate 102 are made of the same heat-conducting material, such as copper. Thermal grease is applied to the top surface of the conical heat-conducting plate 101, which is the bottom plate of the waterproof box 1. The heat-absorbing plate 102 is threadedly fixed to the threaded hole of the bottom plate of the waterproof box 1 by countersunk bolts 105. The support column 104 is attached to the bottom plate of the waterproof box 1 to support the heat-absorbing plate 102. The convex ball array 103 is also attached to the top surface of the conical heat-conducting plate 101. The lithium battery is placed on the top of the heat-absorbing plate 102.

[0023] Furthermore, when the battery generates heat during operation, the heat-absorbing plate 102 absorbs and conducts the heat from the battery. Through the convex ball array 103, it forms multiple sets of multi-point contacts with the top surface of the conical heat-conducting plate 101, increasing the effective contact area and reducing the contact thermal resistance. This allows the heat to be efficiently conducted to the conical heat-conducting plate 101. The conical surface of the conical heat-conducting plate 101 increases the heat dissipation area. The transparent anti-corrosion paint coating on its surface is extremely thin, about 10-50 μm, allowing heat to pass through while isolating water, oxygen, and corrosive ions. At the same time, the conical surface can directionally guide condensate, preventing liquid accumulation from affecting heat exchange efficiency. The frame plate 106 makes the waterproof box 1 and the conical heat-conducting plate 101 float off the ground. The airflow of the ventilation slot 107 washes the conical surface, further accelerating the heat dissipation of the conical heat-conducting plate 101. When the frame plate 106 is in contact with the ground or other load-bearing objects, the water-permeable holes 108 allow any water that may be present in the frame plate 106 to drain outwards.

[0024] The working principle of this utility model is as follows: the waterproof box 1 and the conical heat-conducting plate 101 can be connected and fixed by means of, but not limited to, ultrasonic welding of filler nickel foil, brazing + peripheral adhesive bonding, etc., to maintain sealing and firmness. The conical heat-conducting plate 101 and the heat-absorbing plate 102 are made of the same heat-conducting material, such as copper. Thermal grease is applied to the top surface of the conical heat-conducting plate 101, which is the bottom plate of the waterproof box 1. The heat-absorbing plate 102 is threadedly fixed to the threaded hole of the bottom plate of the waterproof box 1 by countersunk bolts 105. The support column 104 is attached to the bottom plate of the waterproof box 1 to support the heat-absorbing plate 102. The convex ball array 103 is also attached to the top surface of the conical heat-conducting plate 101. The lithium battery is placed on the top of the heat-absorbing plate 102.

[0025] Furthermore, when the battery generates heat during operation, the heat-absorbing plate 102 absorbs and conducts the heat from the battery. Through the convex ball array 103, it forms multiple sets of multi-point contacts with the top surface of the conical heat-conducting plate 101, increasing the effective contact area and reducing the contact thermal resistance. This allows the heat to be efficiently conducted to the conical heat-conducting plate 101. The conical surface of the conical heat-conducting plate 101 increases the heat dissipation area. The transparent anti-corrosion paint coating on its surface is extremely thin, about 10-50 μm, allowing heat to pass through while isolating water, oxygen, and corrosive ions. At the same time, the conical surface can directionally guide condensate, preventing liquid accumulation from affecting heat exchange efficiency. The frame plate 106 makes the waterproof box 1 and the conical heat-conducting plate 101 float off the ground. The airflow of the ventilation slot 107 washes the conical surface, further accelerating the heat dissipation of the conical heat-conducting plate 101. When the frame plate 106 is in contact with the ground or other load-bearing objects, the water-permeable holes 108 allow any water that may be present in the frame plate 106 to drain outwards.

[0026] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented using conventional methods in the field.

Claims

1. A waterproof lithium battery, comprising a waterproof case (1) for encapsulating the lithium battery, characterized in that: The bottom plate of the waterproof box (1) is fixed with several conical heat-conducting plates (101). The waterproof box (1) is detachably equipped with a heat-absorbing plate (102). The bottom of the heat-absorbing plate (102) is integrally formed with multiple sets of convex ball arrays (103) corresponding to the conical heat-conducting plates (101). The convex ball arrays (103) are attached to the top surface of the conical heat-conducting plates (101). The waterproof box (1) is fixedly connected with a frame plate (106) along the bottom periphery. The side walls of the frame plate (106) are all provided with ventilation slots (107).

2. A waterproof lithium battery according to claim 1, characterized in that: The conical surface of the conical heat-conducting plate (101) is coated with a transparent anti-corrosion paint, and the top of the conical heat-conducting plate (101) is coated with thermal grease.

3. A waterproof lithium battery according to claim 1, characterized in that: A support column (104) is provided at the gap of the convex ball array (103), and a countersunk bolt (105) is movably embedded in the center of the support column (104). The inner wall of the bottom plate of the waterproof box (1) is provided with a threaded groove for the countersunk bolt (105) to be screwed in.

4. A waterproof lithium battery according to claim 3, characterized in that: The vertical height of the support column (104) is adapted to the height of the convex spherical array (103).

5. A waterproof lithium battery according to claim 1, characterized in that: The bottom of the frame plate (106) is provided with a water-permeable hole (108).

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