Lithium battery pack

Abstract

The invention belongs to the technical field of battery packs, and particularly relates to a lithium battery pack which comprises a battery pack body, a circulation type ventilation mechanism, a compressed air cooling mechanism, a safety mechanism, a pair of rebound type pressure relief mechanisms and a plurality of pairs of separation vacuum mechanisms. A circulation type ventilation mechanism is arranged in the battery pack body and is used for dissipating heat of the battery spacers, the circulation type ventilation mechanism comprises a vacuum heat insulation partition bin, a pair of circulation supporting plates is connected in the vacuum heat insulation partition bin, and a plurality of circulation heat dissipation pipelines which are uniformly distributed are connected between the pair of circulation supporting plates. According to the lithium battery pack, through arrangement of corresponding mechanisms, heat accumulated in the battery pack is dissipated, damage to the battery pack is reduced, the service life of the battery pack is prolonged, meanwhile, the operation efficiency of the battery pack is improved, the use and maintenance cost is correspondingly reduced, the possibility of fire breakout is reduced, and the safety is high.

Description

Technical Field

[0001] The present invention belongs to the technical field of battery packs, and particularly relates to a lithium battery pack. Background Art

[0002] Lithium batteries are a type of battery with lithium metal or lithium alloy as the positive / negative electrode material and using a non-aqueous electrolyte solution. Lithium-ion batteries have been widely used in various fields due to their advantages in energy density and no emission pollution. However, due to the very active chemical properties of lithium metal, the processing, storage, and use of lithium metal have very high environmental requirements.

[0003] Lithium battery packs are internally connected in series or parallel with lithium battery groups, and a circuit board integrating charge and discharge protection is used to manage the charge and discharge of lithium batteries. As a power source to supply power to DC tools, the charge and discharge protection board adopts a dual-chip & dual-channel charging MOS series design, with redundant design and high safety. The charge and discharge protection board is provided with an external fast discharge function circuit to solve the problem that the whole machine has capacitors that need to be quickly started.

[0004] Currently, when a lithium battery pack is in use, its internal battery group will generate a certain amount of heat. At present, the battery pack does not have a mechanism for rapid heat dissipation. These accumulated heats in the battery pack will damage the lithium battery group, reduce the service life of the lithium battery, and at the same time, the overheating operation of the lithium battery will also lead to a reduction in the operating efficiency of the lithium battery group, and the use and maintenance costs will also increase accordingly. In severe cases, it may even catch fire, with relatively high risks.

[0005] The information disclosed in this background art section is only intended to enhance the overall understanding of the present invention and should not be regarded as an admission or any form of suggestion that this information constitutes prior art already known to those of ordinary skill in the art. Summary of the Invention

[0006] The purpose of the present invention is to provide a lithium battery pack, which can solve the problems that the heat accumulation in the battery pack not only damages the battery group, but also affects the operating efficiency of the battery group, and at the same time, the safety is relatively poor.

[0007] To achieve the above purpose, the technical solution provided by a specific embodiment of the present invention is as follows:

[0008] A lithium battery pack includes: a battery pack body, a flow-through ventilation mechanism, a gas compression cooling mechanism, an insurance mechanism, and several pairs of partition vacuum mechanisms;

[0009] A number of evenly distributed battery separators are provided inside the battery pack body;

[0010] A flow-through ventilation mechanism is provided inside the battery pack body for dissipating heat from the battery separators;

[0011] Among them, the flow-through ventilation mechanism includes a vacuum insulation partition chamber, and a pair of flow-through support plates are connected inside the vacuum insulation partition chamber. A number of evenly distributed flow-through heat dissipation pipes are connected between the pair of flow-through support plates. A flow-through support chamber is connected inside the vacuum insulation partition chamber, and a flow-through heat conduction air pump is connected inside the flow-through support chamber;

[0012] A number of pairs of partition vacuum mechanisms are provided inside the battery pack body to improve the heat dissipation efficiency of the battery separator;

[0013] A gas compression cooling mechanism is connected inside the battery pack body to reduce the temperature inside the battery pack body;

[0014] An insurance mechanism is connected inside the battery pack body to reduce the risk of fire inside the battery pack body.

[0015] In one or more embodiments of the present invention, the flow-through heat dissipation pipes are arranged on the lower side of the battery separator to facilitate ventilation of the lower side of the battery separator, so that the heat inside the battery separator can be dissipated through the flow of air inside the flow-through heat dissipation pipes;

[0016] A pair of flow-through dust-proof nets are connected to the battery pack body, which facilitates the flow of air inside the battery pack body, reduces the dust entering the battery pack body, improves the cleanliness inside the battery pack body, improves the heat dissipation effect inside the battery pack body, and reduces the influence of dust on heat dissipation;

[0017] Ventilation grooves matching the flow-through dust-proof nets are drilled on the battery pack body, which facilitates the installation of the flow-through dust-proof nets, improves the stability of the flow-through dust-proof nets, reduces the probability of the flow-through dust-proof nets falling off, and the flow-through heat conduction air pump penetrates through the flow-through support chamber.

[0018] In one or more embodiments of the present invention, the partition vacuum mechanism includes a partition vacuum pipe, which facilitates the accommodation of the partition vacuum heat dissipation wire layer, provides corresponding space for the installation of the partition vacuum heat dissipation wire layer, and at the same time avoids the leakage of alcohol inside the partition vacuum pipe. The partition vacuum pipe penetrates through the vacuum insulation partition chamber;

[0019] A partition vacuum heat dissipation wire layer is connected inside the partition vacuum pipe, which can absorb alcohol, make the alcohol evaporate more quickly, and make the heat absorption efficiency inside the partition vacuum pipe higher;

[0020] The inside of the partition vacuum pipe is set to be vacuum, which can not only reduce the leakage of alcohol, but also improve the heat absorption efficiency of alcohol. The partition vacuum heat dissipation wire layer is filled with alcohol, which can absorb the heat inside the vacuum insulation partition chamber. After the alcohol evaporates, it rises along the guidance of the partition vacuum pipe and cools inside the battery pack body to form a cycle.

[0021] In one or more embodiments of the present invention, the air compression and temperature reduction mechanism includes a pair of compressed air intake chambers, which can be connected to a number of compressed air intake pipes, enabling the high-pressure efficiency-enhancing air pump to better extract the air outside the battery pack body;

[0022] A number of compressed air intake pipes are connected to the compressed air intake chamber, connecting the compressed air intake chamber with the outside air, enabling the outside air to better enter the battery pack body. The compressed air intake pipes penetrate through the battery pack body;

[0023] A compressed dust-proof net is connected inside the compressed air intake pipe, reducing the possibility of dust entering the battery pack body, improving the cleanliness inside the battery pack body, and reducing the coverage of dust on the partition vacuum pipe and the pressurizing fine cotton.

[0024] In one or more embodiments of the present invention, a high-pressure efficiency-enhancing air pump is connected to the lower side of the compressed air intake chamber, which can extract the air inside the compressed air intake chamber, continuously inject air into the battery pack body, compress the air inside the battery pack body, increase the air pressure inside the battery pack body, and reducing the air temperature by pressurizing the air pressure can increase the heat dissipation effect inside the battery pack body;

[0025] The high-pressure efficiency-enhancing air pump penetrates through the compressed air intake chamber, facilitating the extraction of the air inside the compressed air intake chamber by the high-pressure efficiency-enhancing air pump. A pressurizing fine cotton is connected inside the battery pack body. When extracting the outside air into the battery pack body, it is inevitable to draw the outside moisture into the battery pack body. The pressurizing fine cotton can absorb moisture and can cool the inside of the vacuum heat insulation partition chamber when it is in contact with the vacuum heat insulation partition chamber.

[0026] In one or more embodiments of the present invention, a pair of pressure relief pipes are fixedly installed on the lower side of the battery pack body, and a pressure relief electronic valve is fixedly installed inside the pressure relief pipes.

[0027] In one or more embodiments of the present invention, the insurance mechanism includes an insurance chamber, which facilitates the accommodation of dry ice, reduces the possibility of dry ice leakage, and enables the dry ice to be used for a longer time;

[0028] An insurance leakage pipe is connected to the lower side of the insurance chamber, facilitating the installation of the insurance electronic valve and providing a corresponding channel for the discharge of dry ice. The insurance leakage pipe penetrates through the insurance chamber.

[0029] In one or more embodiments of the present invention, an insurance electronic valve is connected to the insurance leakage pipe. When the temperature inside the battery pack body is too high, the insurance electronic valve opens, causing the dry ice to leak, quickly cooling the inside of the battery pack body, and reducing the risk of the battery separator catching fire. Dry ice is provided inside the insurance chamber.

[0030] Compared with the prior art, a lithium battery pack of the present invention, through the setting of corresponding mechanisms, dissipates the heat accumulated in the battery pack, reduces the damage to the battery pack, improves the service life of the battery pack, and at the same time improves the operating efficiency of the battery pack. The use and maintenance costs are correspondingly reduced, and the possibility of fire is reduced, and the safety is relatively high. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0032] Figure 1 is the formal sectional view of a lithium battery pack in an embodiment of the present invention;

[0033] Figure 2 is Figure 1 the structural schematic diagram of part A in

[0034] Figure 3 is Figure 1 the structural schematic diagram of part B in

[0035] Figure 4 is Figure 1 the structural schematic diagram of part C in

[0036] Figure 5 is Figure 1 the structural schematic diagram of part D in

[0037] Figure 6 is Figure 1 the structural schematic diagram of part E in

[0038] Figure 7 is Figure 1 the structural schematic diagram of part F in

[0039] Figure 8 is the perspective view of a lithium battery pack in an embodiment of the present invention.

[0040] MAIN REFERENCE NUMERAL DESCRIPTION:

[0041] 1 - Battery pack body, 101 - Battery separator, 2 - Circulating ventilation mechanism, 201 - Vacuum insulation partition chamber, 202 - Circulating support plate, 203 - Circulating heat dissipation pipeline, 204 - Circulating support chamber, 205 - Circulating heat conduction air pump, 206 - Circulating dust screen, 3 - Partition vacuum mechanism, 301 - Partition vacuum pipeline, 302 - Partition vacuum heat dissipation wire layer, 4 - Compressed air cooling mechanism, 401 - Compressed air intake chamber, 402 - Compressed air intake pipeline, 403 - Compressed dust screen, 404 - High-pressure boosting air pump, 405 - Boosting fine cotton, 406 - Pressure relief pipeline, 407 - Pressure relief electronic valve, 6 - Insurance mechanism, 601 - Insurance chamber, 602 - Insurance leakage pipeline, 603 - Insurance electronic valve, 604 - Dry ice. Detailed implementation mode

[0042] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0043] As Figures 1 to 8 shown, a lithium-ion battery pack in an embodiment of the present invention includes: a battery pack body 1, a circulating ventilation mechanism 2, a compressed air cooling mechanism 4, an insurance mechanism 6, and several pairs of partition vacuum mechanisms 3.

[0044] As Figures 1 to 3 shown, a plurality of uniformly distributed battery separators 101 are provided in the battery pack body 1, and a circulating ventilation mechanism 2 is provided in the battery pack body 1 for dissipating heat from the battery separators 101. Among them, the circulating ventilation mechanism 2 includes a vacuum insulation partition chamber 201, which can partition the space inside the battery pack body 1 to form two cavities inside the battery pack body 1.

[0045] Among them, a pair of circulating support plates 202 are connected inside the vacuum insulation partition chamber 201, which can support the circulating heat dissipation pipeline 203, improve the balance of the circulating heat dissipation pipeline 203, and reduce the probability of the circulating heat dissipation pipeline 203 tilting.

[0046] In addition, a plurality of uniformly distributed circulating heat dissipation pipelines 203 are connected between a pair of circulating support plates 202, which can support the battery separators 101 and at the same time enable the air around the battery separators 101 to circulate.

[0047] Among them, a circulation support chamber 204 is connected inside the vacuum insulation partition chamber 201, which can support the circulation heat conduction air pump 205 and at the same time form a cavity, enabling the circulation support chamber 204 to better extract and discharge the air inside the vacuum insulation partition chamber 201.

[0048] In addition, a circulation heat conduction air pump 205 is connected inside the circulation support chamber 204, which can extract the air inside the vacuum insulation partition chamber 201, enable the air inside the vacuum insulation partition chamber 201 to circulate, and discharge the air that has absorbed heat inside the vacuum insulation partition chamber 201.

[0049] As Figures 1 to 8 shown, the circulation heat dissipation pipeline 203 is arranged on the lower side of the battery separator 101, facilitating the ventilation of the lower side of the battery separator 101, and enabling the heat inside the battery separator 101 to be dissipated through the circulation of the air inside the circulation heat dissipation pipeline 203.

[0050] Among them, a pair of circulation dust-proof nets 206 are connected to the battery pack body 1, facilitating the circulation of the air inside the battery pack body 1, reducing the dust entering the battery pack body 1, improving the cleanliness inside the battery pack body 1, enhancing the heat dissipation effect inside the battery pack body 1, and reducing the influence of dust on heat dissipation.

[0051] In addition, ventilation grooves matching the circulation dust-proof nets 206 are drilled on the battery pack body 1, facilitating the installation of the circulation dust-proof nets 206, enhancing the stability of the circulation dust-proof nets 206, reducing the probability of the circulation dust-proof nets 206 falling off, and the circulation heat conduction air pump 205 is arranged through the circulation support chamber 204.

[0052] As Figures 1 to 4 shown, a number of pairs of partition vacuum mechanisms 3 are arranged inside the battery pack body 1 for improving the heat dissipation efficiency of the battery separator 101. The partition vacuum mechanism 3 includes a partition vacuum pipeline 301, which facilitates the accommodation of the partition vacuum heat dissipation wire layer 302, provides a corresponding space for the installation of the partition vacuum heat dissipation wire layer 302, and at the same time avoids the leakage of alcohol inside the partition vacuum pipeline 301. The partition vacuum pipeline 301 is arranged through the vacuum insulation partition chamber 201.

[0053] Among them, a partition vacuum heat dissipation wire layer 302 is connected inside the partition vacuum pipeline 301, which can absorb alcohol, enable the alcohol to evaporate more quickly, and make the heat absorption efficiency inside the partition vacuum pipeline 301 higher.

[0054] In addition, the inside of the partition vacuum pipeline 301 is set to be vacuum, which can not only reduce the leakage of alcohol, but also improve the heat absorption efficiency of alcohol. The partition vacuum heat dissipation wire layer 302 is filled with alcohol, which can absorb the heat inside the vacuum insulation partition chamber 201. After the alcohol evaporates, it rises along the guide of the partition vacuum pipeline 301 and cools inside the battery pack body 1 to form a cycle.

[0055] As shown Figures 1 to 5 in the figure, a pneumatic cooling mechanism 4 is connected inside the battery pack body 1 for reducing the temperature inside the battery pack body 1. The pneumatic cooling mechanism 4 includes a pair of compressed air intake chambers 401, which can communicate with a number of compressed air intake pipes 402, enabling the high-pressure boosting air pump 404 to better extract the air outside the battery pack body 1.

[0056] Among them, a number of compressed air intake pipes 402 are connected to the compressed air intake chamber 401, communicating the compressed air intake chamber 401 with the outside air, enabling the outside air to better enter the battery pack body 1. The compressed air intake pipes 402 are arranged through the battery pack body 1.

[0057] In addition, a compressed dust-proof net 403 is connected inside the compressed air intake pipe 402, reducing the possibility of dust entering the battery pack body 1, improving the cleanliness inside the battery pack body 1, and reducing the coverage of dust on the partition vacuum pipe 301 and the boosting fine cotton 405.

[0058] As shown Figures 1 to 6 in the figure, a high-pressure boosting air pump 404 is connected to the lower side of the compressed air intake chamber 401, which can extract the air inside the compressed air intake chamber 401, continuously inject air into the battery pack body 1, compress the air inside the battery pack body 1, increase the air pressure inside the battery pack body 1, and the increase in air pressure will reduce the temperature of the air, which can increase the heat dissipation effect inside the battery pack body 1.

[0059] In addition, the high-pressure boosting air pump 404 is arranged through the compressed air intake chamber 401, facilitating the extraction of the air inside the compressed air intake chamber 401 by the high-pressure boosting air pump 404. A boosting fine cotton 405 is connected inside the battery pack body 1. When extracting the outside air into the battery pack body 1, it is inevitable to draw the outside moisture into the battery pack body 1. The boosting fine cotton 405 can absorb moisture and can cool the inside of the vacuum heat insulation partition chamber 201 when it is attached to the vacuum heat insulation partition chamber 201.

[0060] As shown Figures 1 to 7 in the figure, a pair of pressure relief pipes 406 are fixedly installed on the lower side of the battery pack body 1, and a pressure relief electronic valve 407 is fixedly installed inside the pressure relief pipes 406.

[0061] As shown Figures 1 to 7 in the figure, an insurance mechanism 6 is connected inside the battery pack body 1 for reducing the risk of fire inside the battery pack body 1. The insurance mechanism 6 includes an insurance chamber 601, which facilitates the accommodation of dry ice 604, reduces the possibility of leakage of dry ice 604, and enables the dry ice 604 to be used for a longer time.

[0062] Among them, an insurance leakage pipe 602 is connected to the lower side of the insurance bin 601, which facilitates the installation of the insurance electronic valve 603 and provides a corresponding channel for the discharge of dry ice 604. The insurance leakage pipe 602 penetrates through the insurance bin 601.

[0063] As Figures 1 to 7 shown, an insurance electronic valve 603 is connected to the insurance leakage pipe 602. When the temperature inside the battery pack body 1 is too high, the insurance electronic valve 603 is opened, causing the dry ice 604 to leak, quickly cooling the inside of the battery pack body 1 and reducing the risk of the battery separator 101 catching fire. Dry ice 604 is provided inside the insurance bin 601.

[0064] During the compression of air, the work done by the outside on the gas will cause an increase in its internal energy. According to the first law of thermodynamics, this will significantly increase the air temperature, especially during adiabatic compression (without heat dissipation), and this phenomenon conforms to the basic principles of thermodynamics, that is, mechanical energy is converted into the thermal energy of the gas;

[0065] However, due to the barrier of the vacuum heat insulation partition bin 201 on both sides, the heat on both sides of the vacuum heat insulation partition bin 201 can be isolated. At the same time, since alcohol will rise to the top of the partition vacuum pipe 301 after evaporation and gasification, the remaining space of the partition vacuum pipe 301 does not conduct heat due to the vacuum setting, and the heat generated by air compression can be isolated outside the vacuum heat insulation partition bin 201.

[0066] When high-pressure air suddenly decompresses and expands, such as when the pressure relief electronic valve 407 is opened and the air quickly discharges from the pressure relief pipe 406, it will rapidly absorb the surrounding heat, causing the heat inside the vaporized alcohol to be absorbed and resulting in a temperature drop. This principle is used in refrigeration equipment and vortex tube coolers. For example, a refrigerator uses the expansion and heat absorption of compressed gas to achieve cooling.

[0067] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0068] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A lithium battery pack, characterized in that, Comprising: A battery pack body, within which a number of evenly distributed battery separators are provided; A flow-through ventilation mechanism, provided within the battery pack body for dissipating heat from the battery separators; Among them, the flow-through ventilation mechanism includes a vacuum insulation partition chamber, within which a pair of flow-through support plates are connected. A number of evenly distributed flow-through heat dissipation pipes are connected between the pair of flow-through support plates. A flow-through support chamber is connected within the vacuum insulation partition chamber, and a flow-through heat conduction air pump is connected within the flow-through support chamber; A number of pairs of partition vacuum mechanisms, connected within the battery pack body for improving the heat dissipation efficiency of the battery separators; A compressed air cooling mechanism, connected within the battery pack body for reducing the temperature within the battery pack body; An insurance mechanism, connected within the battery pack body for reducing the risk of fire within the battery pack body.

2. The lithium battery pack according to claim 1, wherein The flow-through heat dissipation pipes are provided on the lower side of the battery separators. A pair of flow-through dust screens are connected to the battery pack body, and ventilation slots matching the flow-through dust screens are drilled on the battery pack body. The flow-through heat conduction air pump is arranged through the flow-through support chamber.

3. A lithium battery pack according to claim 1, characterized in that, The partition vacuum mechanism includes a partition vacuum pipe, which is arranged through the vacuum insulation partition chamber.

4. A lithium battery pack according to claim 3, characterized in that, A partition vacuum heat dissipation wire layer is connected within the partition vacuum pipe. The interior of the partition vacuum pipe is set to be vacuum, and alcohol is filled within the partition vacuum heat dissipation wire layer.

5. A lithium battery pack according to claim 1, characterized in that, The compressed air cooling mechanism includes a pair of compressed air intake chambers, and a number of compressed air intake pipes are connected to the compressed air intake chambers.

6. A lithium battery pack according to claim 5, characterized in that, The compressed air intake pipes are arranged through the battery pack body. A compressed dust screen is connected within the compressed air intake pipes. A high-pressure boosting air pump is connected to the lower side of the compressed air intake chamber.

7. A lithium battery pack according to claim 6, characterized in that, The high-pressure boosting air pump is arranged through the compressed air intake chamber, and boosting fine cotton is connected within the battery pack body.

8. A lithium battery pack according to claim 7, wherein, A pair of pressure relief pipes are fixedly installed on the lower side of the battery pack body, and a pressure relief electronic valve is fixedly installed within the pressure relief pipes.

9. A lithium battery pack according to claim 1, characterized in that, The insurance mechanism includes an insurance chamber, and an insurance leakage pipe is connected to the lower side of the insurance chamber, which is arranged through the insurance chamber.

10. A lithium battery pack according to claim 9, characterized in that, An insurance electronic valve is connected to the insurance leakage pipe, and dry ice is provided within the insurance chamber.

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