Lithium battery pack with short circuit prevention function

Abstract

The utility model discloses a lithium battery pack with a short circuit prevention function, and relates to the technical field of lithium batteries. The device consists of a lithium battery box body, a box cover, a lithium battery pack, a heat conducting plate, a water wheel, an infrared thermometer, a PLC (Programmable Logic Controller) and a drain valve. Wherein the lithium battery box body and the box cover are fixed through bolts, a heat conducting plate and a lithium battery pack are arranged in the lithium battery box body, a water injection cavity for absorbing heat is arranged between the heat conducting plate and the lithium battery box body, a plurality of ventilation openings and a dustproof filter screen are arranged on the side wall of the lithium battery box body, and a cooling fan is arranged on the inner wall of the lithium battery box body to form an air channel for cooling; an infrared thermometer monitors the temperature of the water injection cavity, a PLC controls a cooling fan to be started according to the temperature, a drainage valve is arranged at the bottom of a heat conduction plate to facilitate liquid drainage, and therefore the lithium battery pack is effectively cooled through the heat conduction plate, the short circuit risk caused by overheating of the lithium battery pack is reduced, and cost is low; the anti-short-circuit effect is good, and the practicability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, in particular to a lithium battery pack with a short-circuit prevention function. Background Art

[0002] Lithium battery packs (NCA for short) are improved and optimized based on the original lithium-ion battery packs. They use battery packs with higher energy density, greater safety, reliability and long cycle life to meet the needs of mobile power products such as mobile power supplies and energy storage devices. NCA battery packs are made of high-quality positive and negative electrode materials, electrolytes, diaphragms, and packaging materials. They have a high cycle life, excellent charge and discharge performance and good safety performance.

[0003] Lithium battery packs generate heat during use. High temperature will accelerate the chemical reaction inside the battery, causing aging and corrosion of the diaphragm and liquid electrolyte inside the battery. At the same time, aging and corrosion may damage the internal structure of the battery, causing unnecessary contact between the positive and negative electrodes, thereby causing a short circuit. High temperature will cause the expansion and contraction of the positive and negative electrode materials of the battery, resulting in stress changes inside the battery. This stress change may damage the battery structure and further cause a short circuit inside the battery. High temperature will also increase the self-discharge rate inside the battery and accelerate the oxidation reaction at the electrode interface. At the same time, it may also further increase the temperature inside the battery, thereby exacerbating the risk of short circuit and diaphragm tearing. In a high temperature environment, the diaphragm separating the negative and positive electrodes of the lithium-ion battery may tear, causing a short circuit. However, some existing lithium battery packs have poor heat dissipation and may cause short circuit problems due to high temperature.

[0004] Therefore, we propose a lithium battery pack with an anti-short circuit function to solve the above-mentioned technical problems. Utility Model Content

[0005] In view of this, the main purpose of the present invention is to provide a lithium battery pack with an anti-short circuit function, which is used to solve the above problems.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: it includes a lithium battery box, a box cover arranged at the upper end of the lithium battery box and a lithium battery pack arranged inside the lithium battery box, a heat conduction plate is arranged inside the lithium battery box, a water injection cavity is arranged between the lithium battery box and the heat conduction plate, a plurality of ventilation holes are opened on the side wall of the lithium battery box, dust-proof filters are arranged on the outer sides of the plurality of ventilation holes, and a plurality of cooling fans are arranged on the inner wall of the lithium battery box.

[0007] As a preferred solution, the plurality of cooling fans are respectively fixed on the inner wall of the lithium battery case where the ventilation opening is opened, and the plurality of cooling fans are symmetrical along the horizontal center line and the vertical center line of the lithium battery case.

[0008] As a preferred solution, the inner wall corners of the lithium battery box are provided with inward concave curvatures, and the outer wall corners of the heat conducting plate are provided with outward concave curvatures.

[0009] As a preferred solution, a plurality of water wheels are arranged inside the lithium battery box.

[0010] As a preferred solution, a plurality of the water wheels are respectively fixed on the inner wall of the lithium battery box close to a plurality of the cooling fans.

[0011] As a preferred solution, the inner wall of the lithium battery box is provided with an infrared thermometer for detecting the temperature of the water filling cavity.

[0012] As a preferred solution, the liquid depth of the water injection chamber is not higher than the lowest point of the infrared thermometer.

[0013] As a preferred solution, a drain valve for draining liquid from the water injection cavity is provided at the bottom of the heat conducting plate.

[0014] As a preferred solution, a PLC controller is provided on the inner wall of the lithium battery box, and the PLC controller is electrically connected to the cooling fan and the infrared thermometer.

[0015] As a preferred solution, the inner wall of the heat conducting plate is in contact with the outer wall of the lithium battery pack.

[0016] Compared with the prior art, the utility model has obvious advantages and beneficial effects. Specifically, it can be seen from the above technical solution that it mainly has the following advantages:

[0017] The utility model provides a lithium battery pack with an anti-short circuit function, which is mainly composed of a lithium battery box, a box cover, a lithium battery pack, a heat conducting plate, a water wheel, an infrared thermometer, a PLC controller and a drain valve. The lithium battery box and the box cover are fixed by bolts, and a heat conducting plate and a lithium battery pack are arranged inside. A water injection cavity is arranged between the heat conducting plate and the lithium battery box for absorbing heat. The side wall of the lithium battery box is provided with a plurality of vents and a dust filter. A heat dissipation fan is arranged on the inner wall to form an air duct for heat dissipation. The water wheel is located on the inner wall of the lithium battery box, and the liquid in the water injection cavity is stirred by wind power to enhance the heat dissipation effect. The infrared thermometer monitors the temperature of the water injection cavity. The PLC controller controls the start of the heat dissipation fan according to the temperature. A drain valve is arranged at the bottom of the heat conducting plate to facilitate the discharge of liquid. Thus, the lithium battery pack is effectively cooled through the heat conducting plate, and the short circuit risk caused by overheating of the lithium battery pack is reduced. The utility model has low cost, good anti-short circuit effect and strong practicality.

[0018] In order to more clearly illustrate the structural features and functions of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the top view of the structure of an embodiment of the utility model;

[0020] Figure 2 This is a schematic diagram of the cross-sectional structure of an embodiment of the utility model. Figure 1 ;

[0021] Figure 3 This is a schematic diagram of the cross-sectional structure of an embodiment of the utility model. Figure 2 ;

[0022] Figure 4 This is a schematic diagram of the cross-sectional structure of an embodiment of the utility model Figure 1 ;

[0023] Figure 5 This is a schematic diagram of the cross-sectional structure of an embodiment of the utility model Figure 2 .

[0024] Explanation of the accompanying drawings: 1. lithium battery box; 2. box cover; 3. heat conduction plate; 4. lithium battery pack; 5. vent; 6. dust filter; 7. cooling fan; 8. water wheel; 9. infrared thermometer; 10. PLC controller; 11. drain valve. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below with reference to the accompanying drawings and implementation examples. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0026] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0027] See also Figures 1 to 5The embodiment of the utility model provides a lithium battery pack with an anti-short circuit function, including a lithium battery case 1, a case cover 2 arranged at the upper end of the lithium battery case 1, and a lithium battery pack 4 arranged inside the lithium battery case 1. The lithium battery case 1 and the case cover 2 are fixed by bolts, and the lithium battery case 1 and the case cover 2 can be separated by removing the bolts. A heat conducting plate 3 is arranged inside the lithium battery case 1, and the inner wall of the heat conducting plate 3 is in contact with the outer wall of the lithium battery pack 4. The lithium battery pack 4 is specifically placed inside the heat conducting plate 3, and the lithium battery pack 4 is in contact with the heat conducting plate 3, so the heat of the lithium battery pack 4 can be transferred to the heat conducting plate 3. A water injection cavity is arranged between the lithium battery case 1 and the heat conducting plate 3. By injecting water into the water injection cavity Water is injected into the interior to absorb the temperature of the heat conducting plate 3, and the heat conducting plate 3 can transfer the temperature of the lithium battery pack 4. A plurality of vents 5 are provided on the side wall of the lithium battery case 1, and a dust filter 6 is provided on the outside of the plurality of vents 5. A plurality of cooling fans 7 are provided on the inner wall of the lithium battery case 1, and the plurality of cooling fans 7 are respectively fixed on the inner wall of the lithium battery case 1 where the vents 5 are provided, and the plurality of cooling fans 7 are symmetrical along the horizontal center line and the vertical center line of the lithium battery case 1. Specifically, four vents 5 can be provided, which are distributed in a rectangular shape on two opposite side walls of the lithium battery case 1. The vents 5 are used to connect the internal space after the lithium battery case 1 and the case cover 2 are combined with the outside world, and the dust filter 6 is fixed to the ventilation holes 5 by bolts. The opening 5 is used to filter large particles of dust and impurities when connected, and reduce the situation that they enter the internal space after the lithium battery box 1 and the box cover 2 are combined. There are two cooling fans 7, which are respectively located on the two side walls where the four ventilation openings 5 ​​are located, and the cooling fans 7 are asymmetric. Two air ducts consisting of one group of ventilation openings 5, the cooling fans 7 and another group of ventilation openings 5 ​​can be formed by the four ventilation openings 5 ​​and the two cooling fans 7. Therefore, two air ducts can be formed inside the lithium battery box 1 through the four ventilation openings 5 ​​and the two cooling fans 7, and the directions of the air ducts are opposite. Therefore, when the device is in use, the lithium battery box 1 is placed flatly, and when the lithium battery pack 4 generates heat during operation, when the cooling fans 7 are When the hot fan 7 is started, it drives the air flow, so that the heat emitted by the lithium battery pack 4 can be blown away and then discharged through the vent 5. At the same time, when the device is in use, after the water injection cavity is formed between the heat conductive plate 3 and the lithium battery case 1, the water inside the water injection cavity cools the heat conductive plate 3 when the heat conductive plate 3 transfers the temperature generated when the lithium battery pack 4 is working, thereby ensuring that the temperature generated by the operation of the lithium battery pack 4 can be transferred to the lithium battery pack 4 by the air duct formed above and the heat conductive plate 3 to avoid the situation where the temperature is too high and affects the internal structure of the lithium battery pack 4, thereby reducing the occurrence of short circuits, thereby realizing the anti-short circuit function, and the water injection cavity of the device can be directly realized by water injection, with low cost.

[0028] See also Figures 2 to 5A plurality of water wheels 8 are arranged inside the lithium battery case 1, and the plurality of water wheels 8 are respectively fixed on the inner side wall of the lithium battery case 1 close to the plurality of cooling fans 7. The inner wall corner of the lithium battery case 1 is provided with an inward concave arc, and the outer wall corner of the heat conducting plate 3 is provided with an outward concave arc. There are two water wheels 8, which are respectively located on the front and rear opposite sides of the lithium battery case 1, and the water wheels 8 are arranged close to the corresponding cooling fans 7, and then fixed to the inner wall of the lithium battery case 1 by bolts. It should be noted that the cross section of the water wheel 8 is concave toward the inner wall of the lithium battery case 1, because After water is injected into the water filling chamber, when the water wheel 8 is rotated by the wind force of the cooling fan 7, the generated water flow is toward the other end of the wind force, and only the water surface will be shaken to flow. At the same time, the water wheel 8 will only produce very small water splashes, and will not splash into the heat conduction plate 3 or the lithium battery pack 4. In addition, the inner wall corners of the lithium battery case 1 are provided with an inner concave arc and the outer wall corners of the heat conduction plate 3 are provided with an outer concave arc, which can make the water in the water filling chamber flow more smoothly when stirred by the water wheel 8, so that the temperature of the heat conduction plate 3 can be absorbed cyclically.

[0029] See also Figures 2 to 5 The inner wall of the lithium battery case 1 is provided with an infrared thermometer 9 for detecting the temperature of the water injection chamber. The liquid depth of the water injection chamber is not higher than the lowest point of the infrared thermometer 9. The infrared thermometer 9 is used to measure the internal space temperature of the lithium battery case 1. The inner wall of the lithium battery case 1 is provided with a PLC controller 10. The PLC controller 10 is electrically connected to the cooling fan 7 and the infrared thermometer 9, and then the temperature information is fed back to the PLC controller 10. When the infrared thermometer 9 detects that the internal space temperature of the lithium battery case 1 reaches a preset high temperature threshold, the PLC controller 10 starts cooling, and the liquid depth of the water injection chamber is not higher than the lowest point of the infrared thermometer 9. This can further ensure that the solution inside the water injection chamber will not contact the lithium battery pack 4.

[0030] See also Figures 2 to 5 A drain valve 11 for discharging liquid from the water injection cavity is provided at the bottom of the heat conducting plate 3. The drain valve 11 is used for discharging the water inside the water injection cavity after use.

[0031] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A lithium battery pack with short-circuit prevention function, comprising a lithium battery box (1), a box cover (2) arranged on the upper end of the lithium battery box (1), and a lithium battery pack (4) arranged inside the lithium battery box (1), characterized in that: A heat conducting plate (3) is arranged inside the lithium battery box (1), a water injection cavity is arranged between the lithium battery box (1) and the heat conducting plate (3), a plurality of ventilation openings (5) are opened on the side wall of the lithium battery box (1), dustproof filters (6) are arranged on the outside of the plurality of ventilation openings (5), and a plurality of cooling fans (7) are arranged on the inner wall of the lithium battery box (1).

2. A lithium battery pack with short-circuit protection function according to claim 1, characterized in that: The plurality of cooling fans (7) are respectively fixed on the inner wall of the lithium battery box (1) where the ventilation opening (5) is opened, and the plurality of cooling fans (7) are symmetrical along the horizontal center line and the vertical center line of the lithium battery box (1).

3. The lithium battery pack with short circuit protection function according to claim 1, characterized in that: The inner wall corners of the lithium battery box (1) are provided with an inward concave curvature, and the outer wall corners of the heat conducting plate (3) are provided with an outward concave curvature.

4. The lithium battery pack with short-circuit protection function according to claim 1, characterized in that: A plurality of water wheels (8) are arranged inside the lithium battery box (1).

5. A lithium battery pack with short-circuit protection function according to claim 4, characterized in that: The plurality of water wheels (8) are respectively fixed on the inner side wall of the lithium battery box (1) in close proximity to the plurality of cooling fans (7).

6. A lithium battery pack with short circuit protection function according to claim 1, characterized in that: The inner wall of the lithium battery box (1) is provided with an infrared thermometer (9) for detecting the temperature of the water injection cavity.

7. A lithium battery pack with short-circuit protection function according to claim 6, characterized in that: The liquid depth of the water injection cavity is no higher than the lowest point of the infrared thermometer (9).

8. The lithium battery pack with short circuit protection function according to claim 1, characterized in that: A drainage valve (11) for discharging liquid from the water injection cavity is provided at the bottom of the heat conduction plate (3).

9. The lithium battery pack with short circuit protection function according to claim 1, characterized in that: A PLC controller (10) is provided on the inner wall of the lithium battery box (1), and the PLC controller (10) is electrically connected to the cooling fan (7) and the infrared thermometer (9).

10. The lithium battery pack with short circuit prevention function according to claim 1, characterized in that: The inner wall of the heat conducting plate (3) is in contact with the outer wall of the lithium battery pack (4).

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