A battery pack structure, a battery pack device and its application

Abstract

The invention discloses a battery pack structure, a battery pack device and application thereof, and relates to the field of new energy batteries. Specifically, the battery pack comprises a battery pack and an outer shell with a top opening which is sleeved outside the battery pack. The battery pack comprises a piezoelectric assembly and a partition which are alternately stacked in a thickness direction. Both ends of the battery pack are partitions. The piezoelectric assembly comprises a loess piezoelectric, a protective cover which is tightly sleeved outside the loess piezoelectric, and wires which are arranged on a positive electrode and a negative electrode. Both ends of the protective cover have an extension length which exceeds the loess piezoelectric. The partition comprises a first partition and a second partition which has a thickness greater than that of the first partition. The thickness of the first partition is greater than twice the extension length. The second partition is located at the top of the battery pack. The second partition has an extension thickness which exceeds the top of the outer shell. The loess has a piezoelectric effect and generates electric energy when subjected to pressure. There is no need to rely on additional charging equipment to charge the battery pack structure. The battery pack structure is easy to use and is safe and environmentally friendly.

Description

Technical Field

[0001] The present invention relates to the field of new energy batteries, and in particular to a battery pack structure, a battery pack device and applications thereof. Background Art

[0002] New energy batteries play a vital role in the fields of electric vehicles, hybrid vehicles and power supply systems, providing people with more environmentally friendly and reliable energy solutions. However, when charging such batteries, they need to be connected to charging equipment powered by the urban power grid. The number of such charging devices is limited and their locations are fixed, which makes charging very inconvenient. In addition, traditional new energy batteries rely entirely on charging equipment for charging, which still consumes a lot of electricity and other energy, and is not environmentally friendly. Summary of the invention

[0003] The present invention provides a battery pack structure, a battery pack device and applications thereof, so as to solve the problem that the existing new energy battery relies on charging equipment for charging, is inconvenient to use, consumes energy and is not environmentally friendly.

[0004] A battery pack structure of the present invention adopts the following technical solution: the structure comprises: a battery pack and a housing with an opening on the top which is sleeved outside the battery pack; a drainage hole is provided at the bottom of the housing;

[0005] The battery pack includes piezoelectric components and separators alternately stacked in the thickness direction, and both ends of the battery pack are separators;

[0006] The piezoelectric assembly includes a loess piezoelectric body, a protective cover tightly mounted on the loess piezoelectric body, a positive electrode and a negative electrode tightly mounted on both ends of the loess piezoelectric body, and wires connected to the positive electrode and the negative electrode, respectively. A plurality of piezoelectric body assemblies are connected in series through the wires; both ends of the protective cover have an extension length beyond the loess piezoelectric body;

[0007] The partition is fitted with the protective cover in a clearance, and a through hole for passing the wire is provided on the partition; the partition includes a first partition and a second partition with a thickness greater than that of the first partition, the second partition is located at the top of the battery pack, the first partition is located at the bottom of the battery pack, and the first partition is located between the piezoelectric components; the thickness of the first partition is greater than twice the extension length; the second partition has an extension thickness beyond the top of the housing;

[0008] The outer shell is provided with a threading groove for leading the wires at the bottom end of the battery pack to the top end.

[0009] Preferably, the loess piezoelectric body is made of loess;

[0010] The water content of the loess piezoelectric body is higher than 10%, which is lower than its plastic limit;

[0011] The dry density of the loess piezoelectric body is 1.20g / cm 3~1.40g / cm 3 .

[0012] Preferably, the hardness and strength of the shell are greater than the hardness and strength of the loess piezoelectric body;

[0013] The housing and the protective cover are both made of insulating material.

[0014] Preferably, the outer edges of the positive electrode and the negative electrode are in contact with the inner wall of the protective sheath;

[0015] Both the positive electrode and the negative electrode are in a grid shape.

[0016] Preferably, the positive electrode between two adjacent piezoelectric body assemblies is adjacent to the negative electrode, and the two adjacent piezoelectric body assemblies are connected in series by a wire passing through the through hole.

[0017] A battery pack device of the present invention adopts the following technical solution: the device comprises a plurality of battery pack structures, a battery box for accommodating the plurality of battery pack structures, a humidifier arranged in the battery box, a water guide connected to the humidifier, a humidity sensor arranged in the battery box, and a control module connected to the humidity sensor;

[0018] The control module is connected with the humidifier;

[0019] A cover is slidably connected to the top of the battery box;

[0020] Multiple battery pack structures are connected in series or in parallel.

[0021] Preferably, the cover plate is sealed and connected to the battery box.

[0022] Preferably, the humidifier is connected to the water introducer through a water supply pipe, and the water supply pipe is passed through the battery box.

[0023] The application of a battery group structure below the ground of the present invention adopts the following technical solution: a plurality of battery group structures are connected in series or in parallel and buried 0.2m to 2m below the ground and connected to the city power grid.

[0024] The above-ground application of a battery pack device of the present invention adopts the following technical solution: the battery pack device is arranged on the chassis of a hybrid vehicle.

[0025] The present invention uses loess as a piezoelectric body. The experimental research results show that loess has a piezoelectric effect. The analysis mechanism reasons are as follows:

[0026] (1) The main mineral in loess is quartz, which accounts for 42% to 56%. Quartz minerals in loess exist in the form of debris particles (micrometer or nanometer scale) and are arranged randomly. From a probability perspective, there is always a part of quartz particles whose optical axis is inconsistent with the direction of force, thus producing a piezoelectric effect under the action of external mechanics.

[0027] (2) Loess is a three-phase body (solid, gas, liquid). It contains a certain amount of water, which exists in the pores of the loess. There are three types of water in the soil: bound water, capillary water and gravity water. Among them, bound water cannot flow freely and has a high density. Bound water is divided into strongly bound water and weakly bound water. The specific gravity of strongly bound water reaches more than 2.0, and the density of weakly bound water is also relatively high. Bound water is part of solid particles. When loess is subjected to external forces, part of the stress is borne by the particles, while the other part of the stress is borne by the water in the pores. Bound water that cannot flow freely can be deformed after being compressed, thereby generating a piezoelectric effect. Capillary water and gravity water will flow after being compressed and cannot be compressed, and cannot generate a piezoelectric effect. However, the flow of water, especially capillary water, will generate a streaming potential, which increases the voltage at both ends of the piezoelectric body. Even if capillary water and gravity water do not flow, their internal molecules are always in motion (such as Brownian motion), and motion will generate energy and force. In other words, when there is no external stress, the mechanical action inside the water body continues to occur, which will provide energy for the generation of the piezoelectric effect.

[0028] (3) The force between the bound water film and the particles in the loess is relatively large, which can adsorb different particles together. The force of strongly bound water is very large, which can reach the MPa level. As mentioned above, it can make the specific gravity of water reach more than 2.0 (the specific gravity of water at room temperature and pressure is 1.0). The adsorption force of weakly bound water can also reach more than 100 kPa. With strong force, deformation will occur, which will produce piezoelectric effect.

[0029] (4) According to the principles of soil mechanics, soil particles themselves carry electric charge due to molecular dissociation and isomorphous substitution on the particle surface (see "Chen Guoxing, et al. Soil Science and Soil Mechanics. Beijing: China Water Resources and Hydropower Press, 2006"); water molecules are polar molecules, so a double electric layer is formed around the particles. The piezoelectric effect significantly increases the surface charge of the particles, and the thickness of the double electric layer will further increase, and the electric potential on the particle surface will naturally increase;

[0030] (5) Piezoelectric charge is only generated on the surface of the piezoelectric body; the particle size of the mineral particles in loess is very small, so the specific surface area of ​​loess is much larger than that of the same volume of quartz, so the piezoelectric effect is stronger;

[0031] (6) Loess will undergo consolidation deformation under the action of upper loads (such as vehicle weight, soil weight, etc.). Loess is an (elastic) plastic body, so this consolidation process lasts for a very long time. That is, under the action of static force, the displacement between loess particles and the deformation of the soil body continue to occur, and piezoelectric effect can also be generated and sustained. In other words, under the action of static force, loess can also be used as a piezoelectric body to make batteries or power generation systems. For example, digging a pit to bury a battery pack or applying stress on the ground through upper loads can build a power generation system.

[0032] The indicator for evaluating the piezoelectric performance of piezoelectric materials is the piezoelectric coefficient. The piezoelectric coefficient of loess is 4 to 10 times that of quartz crystal. Under certain conditions, it can even reach more than 13 times the piezoelectric coefficient of quartz crystal. It can be seen that its piezoelectric performance is very good and its utilization value is very high. At the same time, this also shows that the effect of moisture in loess on the piezoelectricity of loess exceeds that of quartz. Natural loess contains a certain amount of moisture. Since loess can produce piezoelectric effect under static force, when the vehicle is not started and vibration is not generated, the vehicle can be ignited and started under the pressure of the human body and the car body, and it can also be used for lighting. Of course, after the vehicle is started, vibration plays a major role. The piezoelectric effect of loess will be significantly enhanced under the action of vibration, and the piezoelectric voltage will increase several times.

[0033] In summary, loess has a high piezoelectric coefficient and its cost is much lower than that of quartz, PZT, and PVDF. It can be used directly without polarization and other treatments. It has high application value. Loess can be used as a piezoelectric system to make a piezoelectric battery pack structure.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] 1. In the present invention, the main mineral of loess in the loess piezoelectric body is quartz, and the content of quartz mineral can reach 42% to 56%. Quartz minerals in loess do not exist in the form of crystals, but in the form of debris particles, which are arranged randomly. Therefore, there is always a part of quartz particles whose optical axis is inconsistent with the force direction. When the loess piezoelectric body is subjected to external force, electricity can be generated, and there is no need to use charging equipment such as charging piles to charge the battery pack structure. It is easy to use, energy-saving and environmentally friendly.

[0036] 2. In the present invention, the loess piezoelectric body is made of loess, will not burn or explode, and has good safety.

[0037] 3. In the present invention, both ends of the protective cover have an extension length that exceeds the loess piezoelectric body, ensuring that the protective cover can have a good solid effect on the loess piezoelectric body. At the same time, the thickness of the first partition is greater than twice the extension length, which can ensure that there is a gap between the stacked upper and lower protective covers, and will not affect the deformation of the loess piezoelectric body when it is under pressure, that is, the effect of the piezoelectric effect.

[0038] 4. In the present invention, the top of the battery pack is the second partition, and the second partition has an extended thickness beyond the top of the outer shell. When the second partition is subjected to pressure and the loess piezoelectric body deforms and sinks, the second partition is always higher than the edge of the outer shell, so that the outer shell will not affect the pressure applied to the loess piezoelectric body.

[0039] 5. In the present invention, the wires at the bottom of the battery pack are led out to the top through the wire threading groove to prevent the wires from being damaged by pressure.

[0040] 6. In the present invention, the loess used in the loess piezoelectric body is produced by tunnel excavation, that is, solid waste, and its disposal occupies land. However, this type of loess is used to make batteries, turning waste into treasure.

[0041] 7. In the present invention, a positive electrode and a negative electrode are arranged at both ends of the loess piezoelectric body, which can convert the bound charges generated by the piezoelectric effect into movable charges.

[0042] 8. In the present invention, the battery pack device includes a humidifier, which can ensure that the loess piezoelectric body is always kept within a certain humidity range. There is bound water in the loess with a certain humidity, and the bound water includes strongly bound water and weakly bound water. The force between the bound water film and the particles is relatively large, and different particles can be adsorbed together. The force of the strongly bound water is very large, which can reach the MPa level, and can make the specific gravity of water reach more than 2.0 (the specific gravity of water at normal temperature and pressure is 1.0). The adsorption force of the weakly bound water can also reach more than 100 kPa. With a strong effect, deformation will occur, which is helpful to produce the piezoelectric effect.

[0043] 9. In the present invention, the humidity sensor in the battery pack device can monitor the humidity in the battery box and transmit the humidity data to the control module. The control module flexibly controls the start and stop of the humidifier according to the humidity data provided by the humidity sensor, thereby ensuring the humidity of the loess piezoelectric body.

[0044] 10. In the present invention, the top of the battery box is slidably connected to the cover plate, so as to facilitate the transfer of the load borne by the cover plate to multiple battery pack structures.

[0045] 11. In the present invention, when the battery pack device is installed on the chassis of the hybrid vehicle, it can be further installed on the bottom of the engine. During the driving of the hybrid vehicle, obvious bumps will be generated. While the engine vibrates, a dynamic load is applied to the cover plate, and then the pressure is transmitted to the multiple battery pack structures. The piezoelectric effect generates electrical energy. At the same time, during the driving of the hybrid vehicle, the engine generates heat. The piezoelectric effect becomes more significant with the increase of vibration and the increase of temperature (the increase of temperature promotes the movement of water molecules). When the power of the battery pack device reaches the power requirement for driving the vehicle, the fuel engine stops working, and the electric motor powered by the battery pack device works alone to drive the hybrid vehicle. When the power of the battery pack device is not enough to drive the hybrid vehicle alone, the fuel engine starts, and the electric motor supported by the battery pack device and the fuel engine provide power for the vehicle at the same time. In this case, although the fuel engine also works, it is only auxiliary and consumes very little energy. Therefore, when the battery pack structure is applied to the field of hybrid vehicles, it can significantly save gasoline and reduce exhaust emissions, and does not need to rely on charging equipment such as charging piles.

[0046] 12. In the present invention, when the battery pack structure is buried below the road surface, the battery pack structure can be buried within the roadbed. On the one hand, the vibration of the vehicle during driving can be used to stimulate the piezoelectric effect of the loess piezoelectric body to generate electricity. On the other hand, the weight of the vehicle and the weight of the overlying soil can be used to apply a static load to the battery pack structure, which can also stimulate the piezoelectric effect of the loess piezoelectric body to generate electricity. This power generation method is green and environmentally friendly and does not occupy land alone. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0048] Figure 1 It is a cross-sectional view of the piezoelectric assembly and the upper and lower first partitions of the present invention;

[0049] Figure 2 is a cross-sectional view of the battery pack structure of the present invention;

[0050] Figure 3 It is a schematic structural diagram of the partition of the present invention;

[0051] Figure 4 It is a schematic diagram of the structure of the protective cover of the present invention;

[0052] Figure 5 is a front view of a battery pack device of the present invention;

[0053] Figure 6 It is a voltage curve diagram of the piezoelectric component of the present invention within 700ns under a static load of 100kPa;

[0054] Figure 7 The voltage curve of the piezoelectric component of the present invention within 700ns at a vibration frequency of 23Hz;

[0055] Description of Reference Numerals

[0056] 100. Battery pack structure;

[0057] 1. Battery pack; 11. Piezoelectric assembly; 111. Loess piezoelectric body; 112. Protective cover; 113. Positive electrode; 114. Negative electrode; 115. Lead wire; 12. Partition; 121. First partition; 122. Second partition; 123. Through hole;

[0058] 2. Shell; 21. Wire duct;

[0059] 200. Battery pack device;

[0060] 3. Battery box; 4. Humidifier; 5. Water inlet; 6. Humidity sensor; 7. Control module; 8. Cover plate; 9. Water supply pipe. DETAILED DESCRIPTION

[0061] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0062] An embodiment of a battery pack structure of the present invention is as follows Figures 1 to 4 As shown, the battery pack structure 100 comprises: a battery pack 1 and a housing 2 with an opening on the top and sleeved outside the battery pack 1; a drainage hole is provided at the bottom of the housing 2;

[0063] The battery pack 1 includes piezoelectric components 11 and partitions 12 alternately stacked in the thickness direction, and both ends of the battery pack 1 are partitions 12;

[0064] The piezoelectric component 11 includes a loess piezoelectric body 111, a protective cover 112 tightly sleeved outside the loess piezoelectric body 111, a positive electrode 113 and a negative electrode 114 tightly fitted at both ends of the loess piezoelectric body 111, and a wire 115 connected to the positive electrode 113 and the negative electrode 114, respectively. A plurality of piezoelectric components 11 are connected in series through the wire 115; both ends of the protective cover 112 have an extension length exceeding the loess piezoelectric body 111;

[0065] The partition 12 is fitted with the protective cover 112 in a clearance, and a through hole 123 is provided on the partition 12 for passing the wire 115; the partition 12 includes a first partition 121 and a second partition 122 with a thickness greater than that of the first partition 121, the second partition 122 is located at the top of the battery pack 1, the first partition 121 is located at the bottom of the battery pack 1, and the first partition 121 is located between the piezoelectric body components 11; the thickness of the first partition 121 is greater than twice the extension length; the second partition 122 has an extension thickness exceeding the top of the housing 2;

[0066] The housing 2 is provided with a wire threading groove 21 for leading the wire 115 at the bottom end of the battery pack 1 to the top end.

[0067] In the present embodiment, it should be noted that the loess used by the loess piezoelectric body 111 comes from loess generated by tunnel excavation, leveling, road construction or other forms. If it is natural loess, the loess itself has a certain humidity, but if it is discarded loess that has been exposed to the sun outside, the loess can be properly humidified to increase its moisture content.

[0068] In this embodiment, it should be noted that the positive electrode 113 and the negative electrode 114 are made of metal materials, metal oxides and other materials.

[0069] In this embodiment, it should be noted that the gap between the partition 12 and the protective cover 112 is matched, which facilitates the embedding of the partition 12 into the protective cover 112, and also facilitates the air outside the protective cover 112 to enter the loess piezoelectric body 111 through the gap, ensuring that the loess piezoelectric body 111 has a certain humidity.

[0070] In the present embodiment, it should be noted that the materials of the protective cover 112, the outer shell 2 and the partition 12 are all PPR, and the PPR material is characterized by corrosion resistance, acid resistance, alkali resistance, heat resistance and good durability.

[0071] In the present embodiment, it should be noted that the number of partitions 12 is one more than the number of piezoelectric components 11; the depth of the outer shell 2 is less than or equal to the height of the multiple stacked protective covers 112; the positive electrodes 113 of the multiple piezoelectric components 11 are all facing upward; both ends of the protective cover 112 have an extended length that exceeds the loess piezoelectric body 111, ensuring that the protective cover 112 can have a good solid effect on the loess piezoelectric body 111, and at the same time, the thickness of the first partition 121 is greater than twice the extended length, which can ensure that there is a gap between the stacked upper and lower protective covers 112, and will not affect the loess piezoelectric body 111 from bearing pressure.

[0072] In this embodiment, it should be noted that a second partition 122 is provided at the top of the battery pack 1. The second partition 122 has an extended thickness beyond the top of the outer shell 2. When the loess piezoelectric body 111 is deformed and sunk by an external load, the second partition 122 is always higher than the edge of the outer shell 3, thereby preventing the outer shell 2 from affecting the load-bearing ability of the loess piezoelectric body 111.

[0073] In this embodiment, it should be noted that the number of piezoelectric components 11 depends on the power requirements of the specific application scenario.

[0074] In this embodiment, it should be noted that if Q2 loess is used to make a short columnar loess piezoelectric body 111 with a diameter of 60 mm and a thickness of 10 mm, the voltage generated under vibration is 0.63V to 0.92V.

[0075] In this embodiment, it should be noted that the piezoelectric effect test data for the piezoelectric component 11 is as follows:

[0076] (1) Static load test

[0077] ① Sample: Loess piezoelectric body 111 made of disturbed soil sample, diameter 59mm, thickness 20mm, dry density 1.25g / cm 3 , moisture content 12.6%;

[0078] ② Load: 100kPa static load;

[0079] ③ Voltage measurement start time: about 2 minutes after placing the static load;

[0080] ④Measurement voltage result: Figure 6 As shown;

[0081] (2) Vibration test

[0082] ① Sample: Loess piezoelectric body 111 made of disturbed soil sample, diameter 59mm, thickness 20mm, dry density 1.25g / cm 3 , moisture content 12.6%;

[0083] ②Vibration frequency: 23Hz;

[0084] ③Measurement voltage start time: about 2 minutes after vibration starts;

[0085] ④Measurement voltage results: Figure 7 shown.

[0086] In this embodiment, the preparation process of the battery pack structure 100 is as follows:

[0087] Step 1: Making the loess piezoelectric body 111: artificially collecting loess and compacting the loess into a flat and smooth pancake-shaped structure, which is the loess piezoelectric body 111;

[0088] Step 2: Make the piezoelectric component 11: put the protective cover 112 on the loess piezoelectric body 111, determine the positive and negative electrodes of the piezoelectric body 11, and then install the positive electrode 113 and the negative electrode 114 of the lead wire 115 at both ends of the loess piezoelectric body 111 respectively;

[0089] Step 3: Test the electric quantity: Use a voltmeter to test the voltage of the piezoelectric component 11, and determine the number of piezoelectric components 11 according to the design requirements;

[0090] Step 4: Assembling the battery pack structure 100:

[0091] Step 401, prepare a plurality of piezoelectric body components 11 and the same number of first diaphragms 121 and a second diaphragm 122 that meet the design requirements;

[0092] Step 402: Pass the wire 115 at the bottom of a piezoelectric assembly 11 through the through hole 123 of a first partition 121 and the wire threading groove 21 of the housing 2 to the top of the housing 2 in sequence;

[0093] Step 403, passing the wire 115 at the top of the piezoelectric assembly 11 through the through hole 123 of another first partition 121 to connect with the wire 115 at the bottom of another piezoelectric assembly 11;

[0094] Step 404, repeat the operation of step 403, assemble all the piezoelectric components 11 and all the first diaphragms 121 in sequence and connect them in series;

[0095] Step 405, inserting all the assembled and connected piezoelectric components 11 and all the first partitions 121 into the housing 2;

[0096] Step 406 , pass the wire 115 on the top of the battery pack 1 through the through hole 123 of the second partition 122 , and insert the second partition 122 into the outer shell 2 . At this time, the upper part of the second partition 122 is located outside the outer shell 2 .

[0097] In this embodiment, it should be noted that a multimeter is used to determine the positive and negative poles of the piezoelectric component 11 .

[0098] In this embodiment, the loess piezoelectric body 111 is made of loess;

[0099] The water content of the loess piezoelectric body 111 is higher than 10% and lower than its plastic limit;

[0100] The dry density of the loess piezoelectric body 111 is 1.20 g / cm 3 ~1.40g / cm 3 .

[0101] In this embodiment, it should be noted that the plastic limit of loess is usually between 16% and 20%; the water in the loess can produce a piezoelectric effect, but if the water content of the loess is too high, it will affect the stress of the quartz in the loess.

[0102] In this embodiment, it should be noted that if the dry density of the loess is too large, the loess is not easy to deform after being subjected to force, and the piezoelectric effect is weak. If the dry density of the loess is too small, the soil is too loose, easy to crack and break, and the piezoelectric effect is destroyed.

[0103] In this embodiment, the hardness and strength of the housing 2 are greater than the hardness and strength of the loess piezoelectric body 111;

[0104] The housing 2 and the protective cover 112 are both made of insulating materials.

[0105] In this embodiment, it should be noted that since the outer shell 2 is wrapped around the outside of the loess piezoelectric body 111, the hardness and strength of the outer shell 2 are greater than the hardness and strength of the loess piezoelectric body 111, which can ensure that after the battery pack structure 100 is subjected to pressure, the deformation degree of the outer shell 2 is smaller than the deformation degree of the loess piezoelectric body 111, thereby not affecting the deformation of the loess piezoelectric body 111.

[0106] In this embodiment, the outer edges of the positive electrode 113 and the negative electrode 114 are in contact with the inner wall of the protective cover 112;

[0107] The positive electrode 113 and the negative electrode 114 are both in a grid shape.

[0108] In the present embodiment, it should be noted that the positive electrode 113 and the negative electrode 114 are both in the form of a fine grid, and the amount of electricity generated by the piezoelectric effect is proportional to the contact area between the loess piezoelectric body 111 and the positive electrode 113 and the negative electrode 114. The larger the contact area, the higher the amount of electricity generated. Therefore, the positive electrode 113 and the negative electrode 114 are both in the form of a fine grid, which is conducive to full contact with the surface of the loess piezoelectric body 111.

[0109] In this embodiment, the positive electrode 113 and the negative electrode 114 between two adjacent piezoelectric components 11 are adjacent to each other, and the two adjacent piezoelectric components 11 are connected in series by a wire 115 passing through the through hole 123 .

[0110] In the present embodiment, it should be noted that the positive electrodes 113 of the plurality of piezoelectric components 11 are all facing upwards, so the adjacent electrodes are the positive electrode 113 of a lower piezoelectric component 11 and the negative electrode 114 of an upper piezoelectric component 11. The positive electrodes 113 and the negative electrodes 114 of the adjacent piezoelectric components 11 are sequentially connected via the wires 115, thereby achieving the effect of connecting the plurality of piezoelectric components 11 in series.

[0111] An embodiment of a battery pack device of the present invention, as Figure 5 As shown, the battery pack device 200 includes a plurality of battery pack structures 100, a battery box 3 for accommodating the plurality of battery pack structures 100, a humidifier 4 disposed in the battery box 3, a water guide 5 connected to the humidifier 4, a humidity sensor 6 disposed in the battery box 3, and a control module 7 connected to the humidity sensor 6;

[0112] The control module 7 is connected to the humidifier 4;

[0113] The top of the battery box 3 is slidably connected with a cover plate 8;

[0114] A plurality of battery pack structures 100 are connected in series or in parallel.

[0115] In this embodiment, it should be noted that the humidity sensor in the battery pack device can monitor the air humidity in the battery box and transmit the humidity data to the control module. The control module flexibly controls the start and stop of the humidifier according to the humidity data provided by the humidity sensor, thereby ensuring the humidity of the loess piezoelectric body. Specifically, when the air humidity is less than 30%, the humidifier is started, and when the air humidity exceeds 40%, the humidifier is turned off.

[0116] In this example, it should be noted that the specific number of the battery pack structures 100 is determined according to the power requirement of the hybrid vehicle.

[0117] In this example, it should be noted that the battery pack device 200 is connected to the piezoelectric converter to obtain a stable electrical signal.

[0118] In this embodiment, the cover plate 8 is sealed and connected to the battery box 3 .

[0119] In this example, it should be noted that the cover plate 8 is sealedly connected to the battery box 3 , so that a certain humidity can be maintained in the battery box 3 .

[0120] In this embodiment, the humidifier 4 is connected to the water guide 5 through a water supply pipe 9 , and the water supply pipe 9 is passed through the battery box 3 .

[0121] In this example, it should be noted that the water supply pipe 9 is sealedly connected to the battery box 3 .

[0122] The application of the battery group structure of the present invention below the ground includes multiple battery group structures 100 connected in series or in parallel and buried 0.2m to 2m below the ground and connected to the city power grid.

[0123] In this embodiment, it should be noted that the following steps are included:

[0124] Step 1: Connect multiple battery pack structures 100 in series or in parallel;

[0125] Step 1: bury multiple battery pack structures 100 under the road surface;

[0126] Step 2: Apply a static load to the top of the multiple battery pack structures 100;

[0127] Step 3: Connect multiple battery pack structures 100 to the city power grid via piezoelectric converters.

[0128] In the present embodiment, it should be noted that when burying multiple battery pack structures 100, for highways or urban roads, if the foundation is in the form of compacted loess, when the construction reaches 200 mm below the bottom of the foundation, a hand-cranked drill or other form of drill is used to drill holes on the bottom surface of the pit to bury multiple battery pack structures 100. If it is a natural foundation, when excavation reaches the base, continue excavation, over-excavate 200 mm, and drill holes to bury multiple battery pack structures 100. The drill holes are arranged within the roadbed. For railways, excavation is carried out to 1.5 m below the ground, and drilling begins to bury multiple battery pack structures 100. The drilling positions are on both sides of the road within a range from 3 m outside the sleepers to 20 m outside the center line of the road. Traffic vehicles on the road can also apply stress to the battery pack structure 100.

[0129] In this embodiment, it should be noted that the drill holes have a diameter of 71 mm, a depth of 420-430 mm, a drill hole spacing of 200-300 mm, and are arranged in a grid.

[0130] In this embodiment, it should be noted that the environment below the ground meets the air humidity corresponding to the humidity requirement of the loess piezoelectric body 111 .

[0131] The battery assembly device of the present invention is applied above the ground, and the battery assembly device 200 is disposed on the chassis of the hybrid vehicle.

[0132] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery pack structure, characterized in that: The battery pack structure (100) comprises a battery pack (1) and a housing (2) with an opening on the top and sleeved outside the battery pack (1); a drainage hole is provided at the bottom of the housing (2); The battery pack (1) comprises piezoelectric body components (11) and partitions (12) alternately stacked in a thickness direction, and both ends of the battery pack (1) are partitions (12); The piezoelectric body assembly (11) comprises a loess piezoelectric body (111), a protective cover (112) tightly mounted outside the loess piezoelectric body (111), a positive electrode (113) and a negative electrode (114) respectively tightly fitted at two ends of the loess piezoelectric body (111), and a wire (115) respectively connected to the positive electrode (113) and the negative electrode (114), wherein a plurality of the piezoelectric body assemblies (11) are connected in series via the wire (115); both ends of the protective cover (112) have an extension length exceeding the loess piezoelectric body (111); The partition (12) and the protective cover (112) are loosely matched, and a through hole (123) for passing the wire (115) is provided on the partition (12); the partition (12) comprises a first partition (121) and a second partition (122) having a thickness greater than that of the first partition (121); the second partition (122) is located at the top of the battery pack (1), the first partition (121) is located at the bottom of the battery pack (1), and the first partition (121) is located between the piezoelectric components (11); the thickness of the first partition (121) is greater than twice the extension length; the second partition (122) has an extension thickness exceeding the top of the housing (2); The outer shell (2) is provided with a wire threading groove (21) for leading the wire (115) at the bottom end of the battery pack (1) to the top end.

2. A battery pack structure according to claim 1, characterized in that: The loess piezoelectric body (111) is made of loess; The water content of the loess piezoelectric body (111) is higher than 10% and lower than its plastic limit; The dry density of the loess piezoelectric body (111) is 1.20 g / cm 3 ~1.40g / cm 3 .

3. A battery pack structure according to claim 1, characterized in that: The hardness and strength of the shell (2) are greater than the hardness and strength of the loess piezoelectric body (111); The outer shell (2) and the protective cover (112) are both made of insulating material.

4. A battery pack structure according to claim 1, characterized in that: The outer edges of the positive electrode (113) and the negative electrode (114) are in contact with the inner wall of the protective sleeve (112); The positive electrode (113) and the negative electrode (114) are both in a grid shape.

5. A battery pack structure according to claim 1, characterized in that: The positive electrode (113) and the negative electrode (114) between two adjacent piezoelectric body components (11) are adjacent to each other, and the two adjacent piezoelectric body components (11) are connected in series by a wire (115) passing through the through hole (123).

6. A battery pack device, characterized in that: The battery pack device (200) comprises a plurality of battery pack structures (100) according to any one of claims 1 to 5, a battery box (3) for accommodating the plurality of battery pack structures (100), a humidifier (4) arranged in the battery box (3), a water guide (5) connected to the humidifier (4), a humidity sensor (6) arranged in the battery box (3), and a control module (7) connected to the humidity sensor (6); The control module (7) is connected to the humidifier (4); A cover plate (8) is slidably connected to the top of the battery box (3); A plurality of the battery pack structures (100) are connected in series or in parallel.

7. A battery pack device according to claim 6, characterized in that: The cover plate (8) is sealedly connected to the battery box (3).

8. A battery pack device according to claim 6, characterized in that: The humidifier (4) is connected to the water guide (5) via a water supply pipe (9), and the water supply pipe (9) is passed through the battery box (3).

9. The use of the battery pack structure according to any one of claims 1 to 5 below the ground, characterized in that: A plurality of the battery group structures (100) are connected in series or in parallel and buried 0.2m to 2m below the ground, and connected to the city power grid.

10. Use of the battery assembly device above the ground as claimed in any one of claims 6 to 8, characterized in that: The battery pack device (200) is arranged on the chassis of the hybrid vehicle.

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