A balanced heat dissipation lithium battery energy storage system

Abstract

The invention belongs to the field of lithium battery energy storage, and discloses a balanced heat dissipation lithium battery energy storage system, comprising: a box body, a first side of which is provided with an air outlet; a lithium battery pack, comprising M×N lithium batteries arranged in a matrix form; a temperature detection module, used for detecting the temperature of each lithium battery; three movable fan modules, respectively located on the second side, the third side and the fourth side of the lithium battery pack, and the fans of which can move along a straight line to blow air to different heat dissipation channels in the lithium battery pack; a heat dissipation path configuration module, comprising a rotatable wind shield located at each wind direction adjustment node; the wind direction adjustment node is an intersection node of the heat dissipation channel; and a control module, used for controlling the three movable fan modules and the heat dissipation path configuration module to work according to temperature data detected by the temperature detection module, so as to cooperate with the air outlet to achieve balanced heat dissipation in the lithium battery energy storage system.

Description

Technical Field

[0001] The present invention belongs to the field of lithium battery energy storage, and in particular relates to a balanced heat dissipation lithium battery energy storage system. Background Art

[0002] Batteries play an important role in the performance of electric vehicles, such as the driving range. Among them, lithium batteries have gradually become an important candidate battery in the electric vehicle industry due to their high energy density and low self-discharge rate. Lithium batteries are very sensitive to operating temperature. High temperature environments (T>35℃) will aggravate battery side reactions, causing capacity decay and shortened life, and may even cause fires due to overheating; low temperature environments (T<15℃) will cause the battery pack capacity to decrease and life to shorten due to increased internal resistance. Therefore, efficient thermal management analysis of lithium batteries is very important.

[0003] At present, thermal management for lithium battery energy storage systems includes air cooling and water cooling. Among them, air cooling is basically achieved by setting up fans in the system. For lithium battery energy storage systems that run for a long time, increasing the fan operating power can solve the problem of high operating temperature caused by long system operation time to a certain extent. However, the operating temperature and heat dissipation of each battery unit in the system are different. In addition, the battery pack area far away from the fan will be in a higher temperature working environment, which will cause uneven temperature distribution between the cells of the battery pack and affect the working life of the system. Summary of the invention

[0004] In order to solve the above problems existing in the prior art, the present invention provides a balanced heat dissipation lithium battery energy storage system.

[0005] The technical problem to be solved by the present invention is achieved through the following technical solutions:

[0006] A balanced heat dissipation lithium battery energy storage system, comprising:

[0007] A box body; a first side of the box body is provided with an air outlet;

[0008] A lithium battery pack; the lithium battery pack is located in the middle area of ​​the box; the lithium battery pack includes M×N lithium batteries arranged in a matrix; wherein a fixed spacing is provided between adjacent lithium batteries to form a heat dissipation channel in the lithium battery pack; M>2, N>2;

[0009] Temperature detection module; the temperature detection module is used to detect the temperature of each of the lithium batteries;

[0010] Three movable fan modules; the three movable fan modules are respectively located on the second side, the third side and the fourth side of the lithium battery pack; wherein the second side and the fourth side are opposite to each other; the fans in the movable fan modules can move along a straight line to blow air to different heat dissipation channels in the lithium battery pack;

[0011] A heat dissipation path configuration module; the heat dissipation path configuration module includes a rotatable wind shield located at each wind direction adjustment node; the wind direction adjustment node is an intersection node of the heat dissipation channel;

[0012] Control module; the control module is used to control the three movable fan modules and the heat dissipation path configuration module to work according to the temperature data detected by the temperature detection module, so as to cooperate with the air outlet to achieve balanced heat dissipation in the lithium battery energy storage system.

[0013] Optionally, the movable fan module comprises: a ball screw, a screw support seat, a rolling bearing, a motor and a fan;

[0014] The screw support seat is fixed to the bottom of the box body; the screw support seat cooperates with the rolling bearing to support the ball screw;

[0015] The ball screw includes a screw shaft and a sliding member; the sliding member is slidably connected to the screw shaft; the motor drives the screw shaft to rotate, so that the sliding member can perform linear motion along the screw shaft; the fan is fixed on the sliding member.

[0016] Optionally, the movable fan module further comprises: a reducer and a coupling;

[0017] Among them, one end of the ball screw is connected to the reducer through the coupling; the reducer is connected to the motor.

[0018] Optionally, two air guide plates are provided on the first side of the box body; the two air guide plates are symmetrically arranged in a mirror-like manner, and the air outlet is located in the middle of the two air guide plates.

[0019] Optionally, the air guide plate is an arc-shaped air guide plate; the arc is bent outward of the box body.

[0020] Optionally, the rotatable windshield comprises: a windshield, a rotating base and a micro reduction motor;

[0021] The windshield is fixed on the rotating base, the micro reduction motor is fixed on the bottom of the box, and the rotating base is connected to the micro reduction motor so that the rotating base and the windshield are driven to rotate by the micro reduction motor.

[0022] Optionally, the temperature detection module includes a plurality of temperature sensors whose number and position correspond to each lithium battery one by one; and the plurality of temperature sensors are installed on the top plate of the box body.

[0023] Optionally, the control module controls the three movable fan modules and the heat dissipation path configuration module to work according to the temperature data detected by the temperature detection module, including:

[0024] When it is determined according to the temperature data that there is no abnormal temperature in the lithium battery pack, controlling the three movable fan modules and the heat dissipation path configuration module to work according to a first heat dissipation strategy;

[0025] The first heat dissipation strategy includes: controlling the fan on the third side of the lithium battery pack to move back and forth in a straight line and blow air, controlling each rotatable wind shield to rotate to 0°, and controlling the movable fan modules on the second and fourth sides of the lithium battery pack to not work;

[0026] The angle of the rotatable wind shield is the angle between the rotatable wind shield and the second side or the fourth side of the lithium battery pack.

[0027] Optionally, the control module controls the three movable fan modules and the heat dissipation path configuration module to work according to the temperature data detected by the temperature detection module, including:

[0028] When it is determined according to the temperature data that a single lithium battery in the lithium battery pack is overheated, the three movable fan modules and the heat dissipation path configuration module are controlled to work according to a second heat dissipation strategy;

[0029] The second heat dissipation strategy includes: controlling the four rotatable wind shields around the single lithium battery to rotate to corresponding preset angles respectively to form a fully enclosed heat dissipation path around the lithium battery, and controlling two fans to blow air into the fully enclosed heat dissipation path; the two fans include a fan on the third side of the lithium battery pack.

[0030] Optionally, the control module controls the three movable fan modules and the heat dissipation path configuration module to work according to the temperature data detected by the temperature detection module, including:

[0031] When it is determined according to the temperature data that the overall temperature of the local area of ​​the lithium battery pack is overheated, the three movable fan modules and the heat dissipation path configuration module are controlled to work according to a third heat dissipation strategy;

[0032] The third heat dissipation strategy includes:

[0033] Determine a first heat dissipation channel at which the second boundary of the local area is located, recorded as CH2, determine a first heat dissipation channel at which the fourth boundary of the local area is located, recorded as CH4, and determine a second heat dissipation channel at which the third boundary of the local area is located, recorded as CH3; the second boundary, the fourth boundary, and the third boundary are respectively the boundaries of the local area close to the second side, the fourth side, and the third side of the lithium battery pack; the first heat dissipation channel is a heat dissipation channel parallel to the second side or the fourth side of the lithium battery pack, and the second heat dissipation channel is a heat dissipation channel parallel to the first side or the third side of the lithium battery pack;

[0034] Control the fans on the second and fourth sides of the lithium battery pack to blow air toward CH3, control the fans on the third side of the lithium battery pack to blow air toward {CH2-CH4}, and control some rotatable windshields to rotate in coordination; {CH2-CH4} represents a set consisting of CH2, CH4, and the first heat dissipation channel between CH2 and CH4;

[0035] Among them, when the fan on the third side of the lithium battery pack blows air to any first heat dissipation channel CHn in {CH2~CH4}, each rotatable wind shield in CHn is controlled to rotate to 0°, the rotatable wind shield on the second side of the wind direction adjustment node where CHn and CH3 meet is marked as P2, P2 is controlled to rotate to 45°, the rotatable wind shield between P2 and the second side of the lithium battery pack is controlled to rotate to 90°, and the rotatable wind shield between P2 and the first side of the lithium battery pack is controlled to rotate to 0°; the rotatable wind shield on the fourth side of the wind direction adjustment node where CHn and CH3 meet is marked as P4, P4 is controlled to rotate to 135°, the rotatable wind shield between P4 and the fourth side of the lithium battery pack is controlled to rotate to 90°, and the rotatable wind shield between P4 and the first side of the lithium battery pack is controlled to rotate to 0°;

[0036] The angle of the rotatable wind shield is the angle between the rotatable wind shield and the second side or the fourth side of the lithium battery pack.

[0037] The balanced heat dissipation lithium battery energy storage system provided by the present invention detects the temperature of each lithium battery in the lithium battery pack, and controls three movable fan modules and a heat dissipation path configuration module to work according to the detected temperature data, thereby effectively optimizing the uneven temperature distribution problem in the lithium battery pack caused by different heating areas in the lithium battery pack by changing the angle of each rotating wind shield and the blowing position of the three movable fan modules, achieving balanced heat dissipation in the lithium battery pack, and effectively reducing the power loss of the system, thereby improving the system life.

[0038] The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1It is a structural schematic diagram of a balanced heat dissipation lithium battery energy storage system provided by an embodiment of the present invention;

[0040] Figure 2 is a structural schematic diagram of a movable fan module proposed in an embodiment of the present invention;

[0041] Figure 3 is a schematic structural diagram of a rotatable wind shield proposed in an embodiment of the present invention;

[0042] Figure 4 The figure shows the path of the heat dissipation fluid under the first heat dissipation strategy according to the embodiment of the present invention;

[0043] Figure 5 The figure shows the path of the heat dissipation fluid under the second heat dissipation strategy according to the embodiment of the present invention;

[0044] Figure 6 A heat dissipation fluid travel path under the third heat dissipation strategy according to an embodiment of the present invention is shown;

[0045] Figure 7 Another heat dissipation fluid travel path under the third heat dissipation strategy according to an embodiment of the present invention is shown;

[0046] Figure 8 Another heat dissipation fluid travel path of an embodiment of the present invention under the third heat dissipation strategy is shown.

[0047] Reference numerals:

[0048] 1. Lithium battery; 2. Rotatable wind shield; 3. Fan; 4. Air outlet; 5. Wind guide plate; 6. Screw shaft; 7. Motor; 8. Temperature sensor; 9. Reducer; 11. Coupling; 12. Sliding part; 13. Circulator; 14. Mounting bracket; 15. Screw support seat; 16. Rolling bearing; 21. Wind shield; 22. Rotating base. DETAILED DESCRIPTION

[0049] The present invention is further described in detail below with reference to specific embodiments, but the embodiments of the present invention are not limited thereto.

[0050] In order to balance the temperature between the battery cells in the lithium battery energy storage system, thereby reducing the power loss of the lithium battery energy storage system and improving the life of the lithium battery energy storage system, an embodiment of the present invention provides a balanced heat dissipation lithium battery energy storage system. The system includes: a box, a lithium battery pack, a temperature detection module, three movable fan modules, a heat dissipation path configuration module and a control module.

[0051] Among them, the lithium battery pack, the temperature detection module, the three movable fan modules and the heat dissipation path configuration module are all located in the box, and the control module is located outside the box. The control module is electrically connected to the lithium battery pack, the temperature detection module, the three movable fan modules and the heat dissipation path configuration module. In an optional implementation, the control module can be a remote control module, but is certainly not limited thereto.

[0052] For the cabinet, see Figure 1 As shown, it can be a common rectangular parallelepiped box, and the box has a first side, a second side, a third side, and a fourth side. The first side is opposite to the third side, and the second side is opposite to the fourth side.

[0053] The main function of the box is to protect the various modules in the lithium battery energy storage system, including rain, dust, lightning protection, etc. In addition, since the lithium battery pack generates heat during the charging and discharging process, the heat needs to be discharged from the box in time, so an air outlet 4 needs to be provided on the box to discharge the heat generated inside the box. Therefore, in the embodiment of the present invention, an air outlet 4 is provided on the first side of the box.

[0054] In one implementation, in order to help heat be discharged from the box more quickly, two air guide plates 5 may be provided on the first side of the box to adjust the air flow direction so that redundant air is discharged from the box from the air outlet 4 more quickly. Figure 1 As shown, the two air guide plates 5 are arranged symmetrically and mirrored, and the middle of the two is the air outlet 4. Preferably, the air guide plate 5 can be an arc-shaped air guide plate 5, and the arc is bent toward the outside of the box, so that the redundant wind is discharged from the air outlet 4 more quickly.

[0055] Please continue to see Figure 1 The lithium battery pack is located in the middle area of ​​the box; the lithium battery pack includes M×N lithium batteries 1 arranged in a matrix form; wherein a fixed distance is set between adjacent lithium batteries 1 to form a heat dissipation channel in the lithium battery pack; M>2, N>2.

[0056] The temperature detection module is used to detect the temperature of each lithium battery 1 , and there are many specific implementation methods.

[0057] Exemplarily, in one implementation, the temperature detection module may include a plurality of temperature sensors 8 whose number and position correspond to each lithium battery 1. The plurality of temperature sensors 8 are installed on the top plate of the box. Specifically, the top plate may be provided with a plurality of grooves, and the temperature sensors 8 are installed in the grooves. Insulating materials such as glass fiber may be arranged in the grooves, thereby reducing the influence of the lithium batteries on each other's temperature and ensuring accurate temperature detection. Alternatively, it may be as follows Figure 1As shown in , it is possible to directly install the temperature sensor 8 on each lithium battery 1. Thus, by using the temperature detection module, the temperature of each lithium battery 1 can be accurately monitored, thereby achieving more refined temperature control.

[0058] In another implementation, the temperature detection module can also be an infrared thermal imaging camera, which can be installed on the top of the box, for example, on the top plate of the box. In this way, the infrared thermal imaging camera can be used to take thermal imaging images of the lithium battery pack, thereby detecting the temperature of each lithium battery 1 in the lithium battery pack.

[0059] The temperature sensor 8 or the infrared thermal imaging camera is electrically connected to the control module, so that the control module can obtain the temperature data of the lithium battery pack in real time.

[0060] Please continue to see Figure 1 , the three movable fan modules are respectively located on the second side, the third side and the fourth side of the lithium battery pack; here, the second side and the fourth side of the lithium battery pack are relative to each other, and the third side and the first side are relative to each other; it should be noted that in the embodiment of the present invention, the orientation settings of the first to fourth sides of different objects such as the box body, the lithium battery pack, and the lithium battery 1 are all kept consistent, and will not be described one by one later.

[0061] The fan 3 in the movable fan module can move in a straight line to supply air to different heat dissipation channels in the lithium battery pack. There are many specific implementation methods of the movable fan module that can achieve this function.

[0062] For example, in one implementation, see Figure 2 As shown, the movable fan module includes: a ball screw, a screw support seat 15, a rolling bearing 16, a motor 7 and a fan 3. Among them, the screw support seat 15 is fixed to the bottom of the box body; the screw support seat 15 cooperates with the rolling bearing 16 to support the ball screw; the ball screw includes a screw shaft 6 and a sliding member 12; the sliding member 12 is slidably connected with the screw shaft 6; the motor 7 drives the screw shaft 6 to rotate, so that the sliding member 12 can make a linear motion along the screw shaft 6; the fan 3 is fixed on the sliding member 12, for example, fixed on the sliding member 12 by a mounting bracket 14. Therefore, when the sliding member 12 makes a linear motion along the screw shaft 6, it can drive the fan 3 to make a linear motion together, so that the fan 3 can supply air from one side of the lithium battery pack to different heat dissipation channels in the lithium battery pack.

[0063] Specifically, the screw shaft 6 is provided with a spiral groove, and a ball is provided in the spiral groove. The ball slides in the spiral groove to push the sliding member 12 to slide along the screw shaft 6; the sliding member 12 is mainly composed of the nut of the ball screw, which can be used through a circulator 13 to make the steel ball roll in the ball spiral groove to push the sliding member 12, ensuring that the sliding member 12 always remains horizontal, so that the fan 3 can always blow air at the lithium battery pack. A reducer 9 and a coupling 11 can also be provided in the movable fan module, and one end of the ball screw is connected to the reducer 9 through the coupling 11; the reducer 9 is connected to the motor 7, so that the screw shaft 6 is driven to rotate under the coordination of the motor 7 and the reducer 9.

[0064] The motor 7, the reducer 9 and the fan 3 are all electrically connected to the control module, so that the control module controls the movable fan module by controlling the motor 7, the reducer 9 and the fan 3 to work in coordination.

[0065] In addition, the movable fan module can also be implemented using other structures, for example: using two motors 7 to drive two rollers respectively, a conveyor belt is installed on the two rollers, a connecting piece is installed on the conveyor belt, and a fan is installed on the connecting piece, so that the motor can drive the fan to move in a straight line through the conveyor belt.

[0066] The heat dissipation path configuration module includes a rotatable wind shield 2 located at each wind direction adjustment node, wherein the wind direction adjustment node refers to the intersection node of the heat dissipation channel. In the embodiment of the present invention, the rotatable wind shield 2 can rotate 360 ​​degrees.

[0067] For example, see Figure 3 As shown, the rotatable windshield 2 includes: a windshield 21, a rotating base 22 and a micro reduction motor. Figure 3 The windshield 21 is fixed on the rotating base 22, the micro-reduction motor is fixed on the bottom of the box, and the rotating base 22 is connected to the micro-reduction motor, so that the rotating base 22 and the windshield 21 are driven to rotate by the micro-reduction motor.

[0068] The micro reduction motors of the rotatable windshields 2 are electrically connected to the control module, so that the control module can control the rotation of the micro reduction motors to adjust the angle of the windshields.

[0069] The control module is used to control the three movable fan modules and the heat dissipation path configuration module to work according to the temperature data detected by the temperature detection module, so as to cooperate with the air outlet 4 to achieve balanced heat dissipation in the lithium battery energy storage system.

[0070] Specifically, the temperature data detected by the temperature detection module can reflect the temperature distribution of the lithium battery pack in real time. Different heat dissipation strategies can be used for different temperature distribution conditions to achieve better heat dissipation effects. Figure 1 The system structure shown can formulate corresponding heat dissipation strategies in advance for different temperature distribution conditions. In this way, during the actual operation of the system, the control module learns the current temperature distribution of the lithium battery pack by analyzing the temperature data, and then selects the corresponding heat dissipation strategy for heat dissipation. In practice, there are many temperature distribution conditions in the lithium battery pack. The following are examples of three common temperature distribution conditions and corresponding heat dissipation strategies.

[0071] The first temperature distribution situation: in a room where the temperature is not high or the ambient temperature is suitable, the temperature of each lithium battery 1 of the lithium battery pack is below the preset high temperature threshold, which indicates that there is no temperature abnormality in the lithium battery pack.

[0072] For the first temperature distribution situation mentioned above, the control module controls the three movable fan modules and the heat dissipation path configuration module to work according to the temperature data detected by the temperature detection module, including: when it is determined according to the temperature data that there is no temperature abnormality in the lithium battery pack, the three movable fan modules and the heat dissipation path configuration module are controlled to work according to the first heat dissipation strategy, and the first heat dissipation strategy includes: controlling the fan 3 on the third side of the lithium battery pack to move back and forth in a straight line and blow air, controlling each rotatable wind shield 2 to rotate to 0°, and controlling the movable fan modules on the second and fourth sides of the lithium battery pack not to work. It should be noted that the angle of the rotatable wind shield 2 is the angle between the rotatable wind shield 2 and the second or fourth side of the lithium battery pack.

[0073] As a result, the heat dissipation fluid in the lithium battery pack will be Figure 4 The path shown by the dashed line is discharged from the box body from the air outlet 4, wherein E11 to E44 are all lithium batteries 1. It can be understood that Figure 4 FIG. 1 shows only the path of the heat dissipation fluid when the fan 3 on the third side of the lithium battery pack blows air to the lithium battery pack at a certain moment. Figure 4 Can clearly express the path of the cooling fluid, Figure 4 The complete structure of each movable fan module and the rotating wind shield is not shown in the figure. Figure 5~Figure 8 The same is true.

[0074] The second temperature distribution situation: some lithium batteries 1 inside the lithium battery pack may have a high temperature due to long service life or large heat dissipation, which exceeds the high temperature threshold. They need to be quickly cooled to avoid abnormalities caused by overheating of the lithium battery 1, such as overheating and explosion. At the same time, the heat generated by the lithium battery 1 must also be prevented from having an adverse effect on nearby lithium batteries 1.

[0075] For the second temperature distribution situation mentioned above, the control module controls the three movable fan modules and the heat dissipation path configuration module to work according to the temperature data detected by the temperature detection module, including: when it is judged according to the temperature data that a single lithium battery 1 in the lithium battery pack is overheated, the three movable fan modules and the heat dissipation path configuration module are controlled to work according to the second heat dissipation strategy, and the second heat dissipation strategy includes: controlling the four rotatable wind shields 2 around the single lithium battery 1 to rotate to corresponding preset angles respectively to form a fully enclosed heat dissipation path around the lithium battery 1, and controlling the two fans 3 to blow air into the fully enclosed heat dissipation path; of the two fans 3 mentioned here, one is the fan 3 on the third side of the lithium battery pack, and the other fan 3 can be either the fan 3 on the second side of the lithium battery pack or the fan 3 on the fourth side of the lithium battery pack.

[0076] by Figure 5 For example, assume that the upper side of the lithium battery pack is the fourth side of the lithium battery pack, and the lower side of the lithium battery pack is the second side of the lithium battery pack. Assume that the temperature of the lithium battery 1 numbered E32 is abnormal, and among the four rotatable windshields 2 around it, the rotatable windshield 2 located at the junction of the third and fourth sides of E32 rotates to 45°, the rotatable windshield 2 located at the junction of the third and second sides of E32 rotates to 45°, the rotatable windshield 2 located at the junction of the second and first sides of E32 rotates to 45°, and the rotatable windshield 2 located at the junction of the first and fourth sides of E32 rotates to 0°; thus, the heat generated by E32 will be Figure 5 The path shown is to discharge the air from the box body through the air outlet 4 .

[0077] In addition, if it is determined based on the temperature data that there are more than one overheated lithium batteries 1 in the lithium battery pack, and they are dispersedly arranged in the lithium battery pack, the lithium batteries 1 can be cooled in sequence according to the control method in the first heat dissipation strategy in the order of high to low temperatures, or the lithium batteries 1 can be polled and cooled in cycles on the basis of the order of high to low temperatures. That is, in each cycle, each lithium battery 1 with abnormal temperature is blown and cooled in sequence according to the order of high to low temperatures; when a cycle ends, in the next cycle, each lithium battery 1 with abnormal temperature is reordered according to temperature, and then polled and cooled again, and so on.

[0078] The third temperature distribution: the lithium battery pack may be overheated due to factors such as sunlight or the mixing of old and new lithium batteries. Alternatively, when the ambient temperature is high, the long-term use of the first heat dissipation strategy for heat dissipation will cause the lithium battery 1 near the air outlet 4 to have poor heat dissipation due to being far away from the fan 3 on the first side of the lithium battery pack, so the overall temperature of the local area of ​​the lithium battery pack near the air outlet 4 will be overheated.

[0079] For the third temperature distribution situation, the control module controls the three movable fan modules and the heat dissipation path configuration module to work according to the temperature data detected by the temperature detection module, including:

[0080] When it is determined based on the temperature data that the overall temperature of a local area of ​​the lithium battery pack is overheated, the three movable fan modules and the heat dissipation path configuration module are controlled to work according to the third heat dissipation strategy, and the third heat dissipation strategy includes:

[0081] (1) Determine a first heat dissipation channel where the second boundary of the local area is located, recorded as CH2, determine a first heat dissipation channel where the fourth boundary of the local area is located, recorded as CH4, and determine a second heat dissipation channel where the third boundary of the local area is located, recorded as CH3.

[0082] Among them, the second boundary, the fourth boundary and the third boundary of the local area are respectively the boundaries of the local area close to the second side, the fourth side and the third side of the lithium battery pack; the first heat dissipation channel is a heat dissipation channel parallel to the second side or the fourth side of the lithium battery pack, and the second heat dissipation channel is a heat dissipation channel parallel to the first side or the third side of the lithium battery pack.

[0083] (2) controlling the fans 3 on the second and fourth sides of the lithium battery pack to blow air toward CH3, controlling the fans 3 on the third side of the lithium battery pack to blow air toward {CH2-CH4}, and controlling part of the rotatable windshield 2 to rotate in coordination; wherein {CH2-CH4} represents a set consisting of CH2, CH4, and the first heat dissipation channel between CH2 and CH4;

[0084] Among them, when the fan 3 on the third side of the lithium battery pack blows air toward any first heat dissipation channel CHn in {CH2~CH4}, each rotatable wind shield 2 in CHn is controlled to rotate to 0°, the rotatable wind shield 2 on the second side of the wind direction adjustment node where CHn and CH3 meet is recorded as P2, P2 is controlled to rotate to 45°, the rotatable wind shield 2 between P2 and the second side of the lithium battery pack is controlled to rotate to 90°, and the rotatable wind shield 2 between P2 and the first side of the lithium battery pack is controlled to rotate to 0°; the rotatable wind shield 2 on the fourth side of the wind direction adjustment node where CHn and CH3 meet is recorded as P4, P4 is controlled to rotate to 135°, the rotatable wind shield 2 between P2 and the fourth side of the lithium battery pack is controlled to rotate to 90°, and the rotatable wind shield 2 between P4 and the first side of the lithium battery pack is controlled to rotate to 0°.

[0085] In a specific example, see Figure 6 , assuming that the upper side of lithium battery 1 is the fourth side of lithium battery 1, and the lower side of lithium battery pack is the second side of lithium battery 1. The overall temperature of the local area formed by lithium battery 1 numbered E43, E44 and E54 is abnormal, and the corresponding positions of CH2, CH4 and CH3 are as follows Figure 6As shown in ; accordingly, the fan 3 on the third side of the lithium battery pack blows air to the first heat dissipation channels in the set {CH2~CH4} in turn, and stays for several seconds each time it moves to a first heat dissipation channel, and at the same time, each rotatable wind shield 2 in the first heat dissipation channel rotates to 0°. For example Figure 6 The fan 3 on the third side of the lithium battery 1 moves to a first heat dissipation channel CHn between CH2 and CH4, and each rotatable wind shield 2 in the first heat dissipation channel rotates to 0. At the same time, the fans 3 on the second and fourth sides of the lithium battery pack blow air to CH3 at a fixed point, and by adjusting the angle of the rotatable wind shield 2 in CH3 and the angle of the rotatable wind shield 2 between P2 and P4 and the first side of the lithium battery pack, the fans 3 on the second and fourth sides of the lithium battery pack will not blow against each other, but let the wind blown by them flow to the air outlet 4 along different paths, such as Figure 6 as shown in .

[0086] In another specific example, the upper side of the lithium battery pack is defined as the fourth side of the lithium battery pack, and the lower side of the lithium battery pack is defined as the second side of the lithium battery pack. Figure 7 and Figure 8 As shown, the lithium battery pack includes a plurality of lithium batteries 1 numbered E11 to E84, wherein a row of lithium batteries 1 near the air outlet 4 in the lithium battery pack is locally overheated due to being away from the fan 3 on the first side, and the heat dissipation control can also be performed according to the third heat dissipation strategy. Among them, when the fan 3 on the third side of the lithium battery 1 moves to the first heat dissipation channel between E51 and E61, the heat dissipation fluid in the lithium battery pack will be Figure 7 When the fan 3 on the third side of the lithium battery 1 moves to the first heat dissipation channel between E21 and E31, the heat dissipation fluid in the lithium battery pack will be discharged from the box body through the air outlet 4. Figure 8 The path shown is to discharge the air from the box body through the air outlet 4 .

[0087] It is understandable that based on Figure 1 For the system structure shown, the heat dissipation strategies that can be pre-formulated in practice are not limited to the three examples mentioned above. Due to the length of the specification, examples will not be given here one by one.

[0088] In addition, in an actual lithium battery energy storage system, the control module may have a control panel, which can be used to manually switch different heat dissipation strategies. The control panel may be a button-type or touch-screen panel, which is not limited in the embodiment of the present invention.

[0089] In summary, the balanced heat dissipation lithium battery energy storage system provided by the embodiment of the present invention detects the temperature of each lithium battery in the lithium battery pack, controls the three movable fan modules and the heat dissipation path configuration module to work according to the detected temperature data, and can accurately dissipate heat and cool down by changing the angle of each rotating wind shield and the blowing position of the three movable fan modules, thereby meeting the balanced heat dissipation and rapid heat dissipation requirements of the lithium battery pack, effectively optimizing the uneven temperature distribution problem in the lithium battery pack caused by different heating areas in the lithium battery pack, achieving balanced heat dissipation in the lithium battery pack, effectively reducing the power loss of the system, and improving the system life and the air-cooling heat dissipation efficiency of the lithium battery pack.

[0090] It should be noted that the terms "first", "second", etc. are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present disclosure described herein can be implemented in an order other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure.

[0091] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0092] Although the present application is described herein in conjunction with various embodiments, in the process of implementing the claimed application, those skilled in the art may understand and implement other changes to the disclosed embodiments by viewing the drawings and the disclosed content. In the description of the present invention, the term "comprising" does not exclude other components or steps, "one" or "an" does not exclude multiple situations, and the meaning of "multiple" is two or more, unless otherwise clearly and specifically limited. In addition, certain measures are recorded in different embodiments, but this does not mean that these measures cannot be combined to produce good results.

[0093] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0094] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0095] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A balanced heat dissipation lithium battery energy storage system, characterized in that: include: A box body; a first side of the box body is provided with an air outlet; A lithium battery pack; the lithium battery pack is located in the middle area of ​​the box; the lithium battery pack includes M×N lithium batteries arranged in a matrix; wherein a fixed spacing is provided between adjacent lithium batteries to form a heat dissipation channel in the lithium battery pack; M>2, N>2; Temperature detection module; the temperature detection module is used to detect the temperature of each of the lithium batteries; Three movable fan modules; the three movable fan modules are respectively located on the second side, the third side and the fourth side of the lithium battery pack; wherein the second side and the fourth side are opposite to each other; the fans in the movable fan modules can move along a straight line to blow air to different heat dissipation channels in the lithium battery pack; A heat dissipation path configuration module; the heat dissipation path configuration module includes a rotatable wind shield located at each wind direction adjustment node; the wind direction adjustment node is an intersection node of the heat dissipation channel; Control module; the control module is used to control the three movable fan modules and the heat dissipation path configuration module to work according to the temperature data detected by the temperature detection module, so as to cooperate with the air outlet to achieve balanced heat dissipation in the lithium battery energy storage system.

2. The balanced heat dissipation lithium battery energy storage system according to claim 1 is characterized in that: The movable fan module comprises: a ball screw, a screw support seat, a rolling bearing, a motor and a fan; The screw support seat is fixed to the bottom of the box body; the screw support seat cooperates with the rolling bearing to support the ball screw; The ball screw includes a screw shaft and a sliding member; the sliding member is slidably connected to the screw shaft; the motor drives the screw shaft to rotate, so that the sliding member can perform linear motion along the screw shaft; the fan is fixed on the sliding member.

3. The balanced heat dissipation lithium battery energy storage system according to claim 2 is characterized in that: The movable fan module further comprises: a reducer and a coupling; Among them, one end of the ball screw is connected to the reducer through the coupling; the reducer is connected to the motor.

4. The balanced heat dissipation lithium battery energy storage system according to claim 1, characterized in that: Two air guide plates are arranged on the first side of the box body; the two air guide plates are arranged symmetrically and mirror-image, and the air outlet is located between the two.

5. The balanced heat dissipation lithium battery energy storage system according to claim 4 is characterized in that: The air guide plate is an arc-shaped air guide plate; the arc is bent toward the outside of the box.

6. The balanced heat dissipation lithium battery energy storage system according to claim 1, characterized in that: The rotatable windshield comprises: a windshield, a rotating base and a micro reduction motor; The windshield is fixed on the rotating base, the micro reduction motor is fixed on the bottom of the box, and the rotating base is connected to the micro reduction motor so that the rotating base and the windshield are driven to rotate by the micro reduction motor.

7. The balanced heat dissipation lithium battery energy storage system according to claim 1, characterized in that: The temperature detection module includes a plurality of temperature sensors whose number and position correspond to each lithium battery one by one; the plurality of temperature sensors are installed on the top plate of the box body.

8. The balanced heat dissipation lithium battery energy storage system according to claim 1, characterized in that: The control module controls the three movable fan modules and the heat dissipation path configuration module to work according to the temperature data detected by the temperature detection module, including: When it is determined according to the temperature data that there is no abnormal temperature in the lithium battery pack, controlling the three movable fan modules and the heat dissipation path configuration module to work according to a first heat dissipation strategy; The first heat dissipation strategy includes: controlling the fan on the third side of the lithium battery pack to move back and forth in a straight line and blow air, controlling each rotatable wind shield to rotate to 0°, and controlling the movable fan modules on the second and fourth sides of the lithium battery pack to not work; The angle of the rotatable wind shield is the angle between the rotatable wind shield and the second side or the fourth side of the lithium battery pack.

9. The balanced heat dissipation lithium battery energy storage system according to claim 1, characterized in that: The control module controls the three movable fan modules and the heat dissipation path configuration module to work according to the temperature data detected by the temperature detection module, including: When it is determined according to the temperature data that a single lithium battery in the lithium battery pack is overheated, the three movable fan modules and the heat dissipation path configuration module are controlled to work according to a second heat dissipation strategy; The second heat dissipation strategy includes: controlling the four rotatable wind shields around the single lithium battery to rotate to corresponding preset angles respectively to form a fully enclosed heat dissipation path around the lithium battery, and controlling two fans to blow air into the fully enclosed heat dissipation path; the two fans include a fan on the third side of the lithium battery pack.

10. The balanced heat dissipation lithium battery energy storage system according to claim 1, characterized in that: The control module controls the three movable fan modules and the heat dissipation path configuration module to work according to the temperature data detected by the temperature detection module, including: When it is determined according to the temperature data that the overall temperature of the local area of ​​the lithium battery pack is overheated, the three movable fan modules and the heat dissipation path configuration module are controlled to work according to a third heat dissipation strategy; The third heat dissipation strategy includes: Determine a first heat dissipation channel at which the second boundary of the local area is located, recorded as CH2, determine a first heat dissipation channel at which the fourth boundary of the local area is located, recorded as CH4, and determine a second heat dissipation channel at which the third boundary of the local area is located, recorded as CH3; the second boundary, the fourth boundary, and the third boundary are respectively the boundaries of the local area close to the second side, the fourth side, and the third side of the lithium battery pack; the first heat dissipation channel is a heat dissipation channel parallel to the second side or the fourth side of the lithium battery pack, and the second heat dissipation channel is a heat dissipation channel parallel to the first side or the third side of the lithium battery pack; Control the fans on the second and fourth sides of the lithium battery pack to blow air toward CH3, control the fans on the third side of the lithium battery pack to blow air toward {CH2-CH4}, and control some rotatable windshields to rotate in coordination; {CH2-CH4} represents a set consisting of CH2, CH4, and the first heat dissipation channel between CH2 and CH4; Among them, when the fan on the third side of the lithium battery pack blows air to any first heat dissipation channel CHn in {CH2~CH4}, each rotatable wind shield in CHn is controlled to rotate to 0°, the rotatable wind shield on the second side of the wind direction adjustment node where CHn and CH3 meet is marked as P2, P2 is controlled to rotate to 45°, the rotatable wind shield between P2 and the second side of the lithium battery pack is controlled to rotate to 90°, and the rotatable wind shield between P2 and the first side of the lithium battery pack is controlled to rotate to 0°; the rotatable wind shield on the fourth side of the wind direction adjustment node where CHn and CH3 meet is marked as P4, P4 is controlled to rotate to 135°, the rotatable wind shield between P4 and the fourth side of the lithium battery pack is controlled to rotate to 90°, and the rotatable wind shield between P4 and the first side of the lithium battery pack is controlled to rotate to 0°; The angle of the rotatable wind shield is the angle between the rotatable wind shield and the second side or the fourth side of the lithium battery pack.

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