A lithium iron phosphate battery module and energy storage device

Abstract

The present invention discloses a lithium iron phosphate battery module and energy storage equipment, comprising a module support plate and a plurality of battery modules above the module support plate, wherein a controller connecting the plurality of battery modules is arranged on the module support plate, a module upper cover is arranged above the battery module, an air outlet groove is arranged at one end of the module upper cover, a protective cover covering the plurality of battery modules is arranged on the module support plate, a gas circulation and heat dissipation mechanism is arranged inside the battery module, and the heat dissipation gas flows outward at the air outlet groove; the lithium iron phosphate battery module and the energy storage equipment have a reasonable and stable overall structure, can ensure internal heat dissipation during use, avoid heat accumulation affecting the normal operation of the module, and the internal battery cells can be limited in multiple directions to avoid the battery cells from loosening or detaching, and can also effectively buffer external impact force to protect the internal module, which is suitable for popularization and use.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy batteries, and in particular to a lithium iron phosphate battery module and energy storage equipment. Background Art

[0002] The battery module is a key component in new energy vehicles. It is mainly composed of multiple battery cells assembled in series or parallel. It is designed to provide higher voltage and capacity to meet the vehicle's power needs during operation.

[0003] Lithium iron phosphate batteries themselves have good thermal stability and are not prone to thermal runaway. In addition, lithium iron phosphate batteries have the advantages of long cycle life, high energy density and efficient charging. They are widely used in new energy vehicles and energy storage systems.

[0004] The invention patent with announcement number CN106129533B discloses a ventilation type lithium battery heat dissipation module structure, which includes a heat dissipation module a, a heat dissipation module b, a hose I, a hose II, an exhaust fan and a control device; the hose I is installed on the left side of the heat dissipation module a, and the hose II is installed on the right side of the heat dissipation module b; one end of the hose II is connected to the right side of the heat dissipation module b, and the other end is connected to the exhaust fan; the control device is installed on the outside of the exhaust fan; the heat dissipation module a includes a module component, a base plate, an exhaust plastic male head and an exhaust plastic female head; the bottom of the module component is installed with a base plate; the exhaust plastic male head is installed on the left top of the module component; the exhaust plastic female head is installed on the right top of the aluminum module; the technical problem of low module heat dissipation efficiency is solved.

[0005] The source of heat inside the battery module is the battery cell. When in use, the above-mentioned heat dissipation module structure mainly extracts air to dissipate heat from the module itself or its surroundings. It cannot directly ventilate and dissipate heat from the heat source (internal battery cell), which is inefficient and inconvenient to use. In addition, the above-mentioned module structure has poor stability, cannot effectively fix the internal battery cell, and cannot protect the module when impacted by external force, resulting in unsatisfactory use effect. Summary of the invention

[0006] The purpose of the present invention is to solve the above-mentioned problems and provide a lithium iron phosphate battery module and energy storage device which can ensure internal heat dissipation during use to prevent heat accumulation from affecting the normal operation of the module, and the internal battery cells can be limited in multiple directions to prevent the battery cells from loosening or detaching. In addition, it can effectively buffer external impact forces to protect the internal modules.

[0007] To achieve the above-mentioned purpose, the technical solution of the present invention is: a lithium iron phosphate battery module, comprising a module pallet and multiple battery modules above the module pallet, a controller connected to the multiple battery modules is provided on the module pallet, a module top cover is provided above the battery module, an air outlet groove is provided at one end of the module top cover, a protective cover covering the multiple battery modules is provided on the module pallet, a gas circulation and heat dissipation mechanism is provided in the battery module, and the heat dissipation gas flows outward at the air outlet groove.

[0008] Preferably, the battery module includes internal lithium iron phosphate battery cells, side plates on both sides and end plates at both ends, the battery cells are arranged in an even-numbered array, a partition is provided between each two adjacent rows of battery cells, the adjacent battery cells on both sides of the partition are connected in series through pole pieces, the inner side of the side plate is provided with a first arc-shaped depression, and the two sides of the partition are provided with a second arc-shaped depression and a third arc-shaped depression, the second arc-shaped depression and the third arc-shaped depression are arranged in sequence at intervals, the first arc-shaped depression, the second arc-shaped depression and the third arc-shaped depression are all matched with the outer circumference of the battery cell, and the two sides of the end plate are welded to the side plate to fix multiple battery cells.

[0009] Preferably, every two adjacent rows of battery cells are spaced apart, with a gap left between two adjacent battery cells in the same row, and limiting grooves are downwardly provided at both ends of the partition, and the length of the limiting grooves is half the height of the partition, and limiting blocks cooperating with the limiting grooves are provided on the inner side of the end plate, and the end plate cooperates with all partitions through the limiting blocks, and the limiting grooves and the limiting blocks are both T-shaped, and slopes are provided on both sides of the end plate, and the side plate and the end plate are welded at the slopes.

[0010] Preferably, a surface of the module support plate is provided with a groove corresponding to the battery module, and the gas circulation and heat dissipation mechanism is arranged in the groove.

[0011] Preferably, the gas circulation and heat dissipation mechanism includes a connecting pipe and a plurality of branch pipes, the connecting pipe is fixed inside the groove, the plurality of branch pipes are respectively connected to the connecting pipe, the branch pipe is arranged directly below between each adjacent two partitions, a plurality of duckbill-shaped nozzles are arranged in an array above the branch pipe, and the nozzles are arranged between each adjacent two battery cells.

[0012] Preferably, the module support plate is also provided with a first air collecting channel, a connecting elbow is provided on one side of the first air collecting channel, one end of the connecting elbow is connected with the first air collecting channel, and the other end extends into the groove to be connected with the connecting pipe, the connecting elbow and the groove correspond one to one, and a centrifugal fan is provided on the bottom surface of the module support plate, the air outlet of the centrifugal fan is connected with the second air collecting channel, the first air collecting channel is connected with the second air collecting channel, and the gas flows out from the air outlet groove after the centrifugal fan is operated.

[0013] Preferably, a fixed support plate is also provided in the groove, the surface of the support plate is provided with countersunk holes corresponding to the battery cells one by one, the surface of the support plate is also provided with a heat dissipation port, the heat dissipation port penetrates the support plate, the nozzle extends vertically into the heat dissipation port, and the heat dissipation port corresponds one by one to the nozzle below.

[0014] Preferably, a notch corresponding to the air outlet groove is provided on one side of the protective cover, an extended heat dissipation channel is provided on the inner side of the notch, a port of the heat dissipation channel covers the air outlet groove, and a supporting mechanism for protecting the battery module is provided on the inner top wall of the protective cover.

[0015] Preferably, the supporting mechanism comprises an upper elastic fin and a lower elastic fin, each of which is two and arc-shaped, and each of which is provided with a cross groove, and the upper elastic fin and the lower elastic fin are cross-arranged in the cross groove, and the upper elastic fin and the lower elastic fin are cross-arranged in opposite directions at the cross groove, and connecting plates are provided at both ends of the cross groove, and waist holes are provided on the connecting plates, and the upper elastic fin is connected to the inner top wall of the protective cover at the waist hole by bolts, and the lower elastic fin is connected to the module upper cover at the waist hole by bolts.

[0016] An energy storage device for a lithium iron phosphate battery module, the energy storage device comprising a module management system, an energy storage converter, a charge and discharge controller, a DC distributor and auxiliary equipment, the module management system manages and monitors the state, temperature, balance and faults of the battery module, the energy storage converter realizes the charge and discharge process of the battery module, the charge and discharge controller monitors the charge and discharge state, current demand, voltage and temperature parameters, the DC distributor comprises a DC switch, a current sensor and a protector of the control device, and the auxiliary equipment comprises a temperature sensor and a humidity sensor in the energy storage device.

[0017] A lithium iron phosphate battery module and energy storage device disclosed in the present invention include a module support plate and multiple battery modules above the module support plate, wherein a controller connecting the multiple battery modules is provided on the module support plate, a module upper cover is provided above the battery module, an air outlet groove is provided at one end of the module upper cover, a protective cover covering the multiple battery modules is provided on the module support plate, a gas circulation and heat dissipation mechanism is provided inside the battery module, and the heat dissipation gas flows outward at the air outlet groove; compared with the prior art, the lithium iron phosphate battery module and energy storage device have the advantages of ensuring internal heat dissipation when in use, avoiding heat accumulation affecting the normal operation of the module, and the internal battery cells can be limited in multiple directions to avoid the battery cells from loosening or detaching, and can also effectively buffer external impact force to protect the internal module. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The structure of the battery module and the battery support plate in the present invention is shown in FIG. Figure 1 .

[0019] Figure 2 The structure of the battery module and the battery support plate in the present invention is shown in FIG. Figure 2 .

[0020] Figure 3 The structure of the battery module and the battery support plate in the present invention is shown in FIG. Figure 3 .

[0021] Figure 4 The structure of the protective cover in the present invention is shown in FIG. Figure 1 .

[0022] Figure 5 The structure of the protective cover in the present invention is shown in FIG. Figure 2 .

[0023] Figure 6 For the present invention Figure 5 Schematic diagram of the enlarged structure at point A in the middle.

[0024] Figure 7 It is a schematic diagram of the structure of the battery module in the present invention.

[0025] Figure 8 It is a schematic diagram of the explosion structure of the battery module in the present invention.

[0026] Fig. 9 It is a schematic diagram of the structure of the separator in the battery module of the present invention.

[0027] Fig.10 For the present invention Figure 8 Schematic diagram of the enlarged structure at point B in the middle.

[0028] Fig.11 It is a schematic diagram of the local structure of the battery module in the present invention.

[0029] Fig.12 The structure of the module support plate in the present invention is shown in FIG. Figure 1 .

[0030] Fig.13 The structure of the module support plate in the present invention is shown in FIG. Figure 2 .

[0031] Fig.14 The structure of the module support plate in the present invention is shown in FIG. Figure 3 .

[0032] Fig.15 For the present invention Fig.13 Schematic diagram of the enlarged structure at point C in the middle.

[0033] Fig.16 For the present invention Fig.14 Schematic diagram of the enlarged structure at D in the middle.

[0034] Fig.17It is a schematic diagram of the structure of the gas circulation and heat dissipation mechanism and the battery module in the present invention.

[0035] Fig.18 It is a schematic diagram of the principle of the energy storage device in the present invention.

[0036] In the figure: 1. module support plate; 11. groove; 12. connecting pipe; 13. branch pipe; 14. nozzle; 15. support plate; 16. countersunk hole; 17. heat dissipation port; 2. battery module; 21. battery cell; 22. side plate; 221. first arc-shaped depression; 23. end plate; 231. slope; 232. limit plug; 24. pole piece; 25. partition; 251. second arc-shaped depression; 252. third arc-shaped depression; 253. limit groove; 3. module upper cover; 31. air outlet groove; 4. protective cover; 41. notch; 42. heat dissipation channel; 43. support mechanism; 431. upper elastic fin; 432. lower elastic fin; 433. cross groove; 434. connecting plate; 435. waist hole; 5. Controller; 6. First air collecting channel; 61. Connecting elbow; 7. Centrifugal fan; 71. Second air collecting channel. DETAILED DESCRIPTION

[0037] The present invention will now be described in further detail with reference to the accompanying drawings. The accompanying drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and thus only show the components related to the present invention.

[0038] Please refer to Figure 1-17 A lithium iron phosphate battery module comprises a module support plate 1 and a plurality of battery modules 2 above the module support plate 1, wherein the module support plate 1 is provided with a controller 5 connected to the plurality of battery modules 2, a module upper cover 3 is provided above the battery module 2, an air outlet groove 31 is provided at one end of the module upper cover 3, and a protective cover 4 covering the plurality of battery modules 2 is provided on the module support plate 1, wherein the module upper cover 3 protects the battery module 2 below, and the protective cover 4 protects all battery modules as a whole to avoid damage and failure of the battery module 2 caused by external force impact, wherein the module upper cover is fixed to the surrounding side plates and end plates by bolts, and the protective cover 4 can be fixed to the surface of the module support plate 1 by bolts, and a gas circulation heat dissipation mechanism is provided in the battery module 2, and the heat dissipation gas flows outward at the air outlet groove 31, and the internal battery core is cooled by the gas circulation heat dissipation mechanism during use to avoid internal aggregation affecting the module performance.

[0039] Specifically, the battery module 2 includes an internal lithium iron phosphate battery cell 21, side plates 22 on both sides, and end plates 23 at both ends. The battery cells 21 are arranged in an even number of rows, and a partition 25 is provided between each two adjacent rows of battery cells 21. The battery cells 21 adjacent to each other on both sides of the partition 25 are connected in series through the pole piece 24. The inner side of the side plate 22 is provided with a first arc-shaped recess 221, and the two sides of the partition 25 are provided with a second arc-shaped recess 251 and a third arc-shaped recess 252. The second arc-shaped recess 251 and the third arc-shaped recess 252 are arranged in sequence. The first arc-shaped recess 221, the second arc-shaped recess 251 and the third arc-shaped recess 252 are all matched with the outer circumference of the battery cell 21, and the two sides of the end plate 23 are welded to the side plates 22. After welding, the two side plates 22 and the two end plates 23 form a fixed frame to fix the multiple battery cells 21 around and prevent any battery cell from loosening. In addition, since the first arc-shaped recess 221, the second arc-shaped recess 251 and the third arc-shaped recess 252 are all matched with the outer circumference of the battery cell 21, the battery cell 21 can also be limited, which greatly improves the stability of the battery cell.

[0040] The battery cells 21 of each adjacent row are arranged at intervals, and a gap is left between two adjacent battery cells 21 in the same row. Limiting grooves 253 are downwardly opened at both ends of the partition 25, and the length of the limiting groove 253 is half the height of the partition 25. The inner side of the end plate 23 is provided with a limiting plug 232 that cooperates with the limiting groove 253. The end plate 23 cooperates with all the partitions 25 through the limiting plug 232. The limiting groove 253 and the limiting plug 232 are both T-shaped, and slopes 231 are provided on both sides of the end plate 23. The side plate 22 and the end plate 23 are welded at the slope; that is to say, the limiting plug 232 on the inner side of the end plate 23 is the same as the number of the partition 25. One by one, when mating, the end plate 23 moves downward from the top, so that the corresponding limit groove 253 is plugged into the limit plug block 232. After mating, all the internal partitions 25 are limited and fixed. Since the battery cell 21 is always in contact with the partition 25, the battery cell 21 is always in a stable state after the partition 25 is limited and fixed; in addition, since slopes 231 are provided on both sides of the end plate 23, the side plate 22 and the end plate 23 are welded at the slope 231, the whole can be reinforced after welding, and the setting of the slope 231 can avoid leakage of the weld, and at the same time, it can ensure the effective transmission of the tensile and compressive stresses of the frame after being hit by external force, ensure the rigid nodes of the welding parts, and improve the overall strength.

[0041] In the solution of the present invention, a groove 11 corresponding to the battery module 2 is provided on the surface of the module support plate 1 , and the gas circulation and heat dissipation mechanism is provided in the groove 11 .

[0042] Please refer again Figure 14-17In this embodiment, the gas circulation and heat dissipation mechanism includes a connecting pipe 12 and a plurality of branch pipes 13. The connecting pipe 12 is fixed to one side of the inner part of the groove 11. The plurality of branch pipes 13 are respectively connected to the connecting pipe 12. The branch pipe 13 is arranged directly below each adjacent two partitions 25 (i.e., directly below the battery cell 21). A plurality of duckbill-shaped nozzles 14 are arranged in an array above the branch pipe 13. The nozzles 14 are arranged in the gap between each adjacent two battery cells 21. Specifically, the module support plate 1 is also provided with a first gas collecting channel 6. The first gas collecting channel 6 A connecting elbow 61 is provided on one side, one end of the connecting elbow 61 is connected to the first air collecting channel 6, and the other end extends into the groove 11 and is connected to the connecting pipe 12. The connecting elbow 61 corresponds to the groove 11 one by one. A centrifugal fan 7 is provided on the bottom surface of the module support plate 1, and the air outlet of the centrifugal fan 7 is connected to the second air collecting channel 71. The first air collecting channel 6 is connected to the second air collecting channel 71. After the centrifugal fan 7 is running, the gas flows out from the air outlet groove 31; the centrifugal fan 7 is arranged on the bottom surface of the module support plate, which can also occupy a smaller area, facilitating the overall installation.

[0043] That is to say, the centrifugal fan 7, the first air collecting channel 6, the connecting pipe 12, the branch pipe 13 are connected to the battery module 2 as a whole. When the centrifugal fan 7 is running, the gas enters the first air collecting channel 6 through the second air collecting channel 71. The first air collecting channel 6 is connected to the connecting pipes 12 in each groove 11 through a plurality of connecting elbows 61. Since the connecting pipe 12 is connected to a plurality of branch pipes 13, and a plurality of nozzles 14 are provided on the branch pipes 13; therefore, the gas enters the connecting pipe 12 and is ejected from the nozzle 14. The duckbill-shaped nozzle 14 can increase the gas flow rate and can quickly take away a large amount of heat; since the nozzle 14 is provided in the gap between each adjacent two battery cells 21, the gas ejected upward can take away a large amount of heat from the battery cells, and the air carrying the heat eventually flows out from the air outlet groove 31 at the end of the module cover 3, thereby realizing internal air circulation.

[0044] When in use, all the internal battery cells 21 can spray gas through the nozzle 14 to dissipate heat inside the module; and the outermost battery cells 21 transfer heat to the side plates through heat transfer, and dissipate heat through the side plates.

[0045] Based on the above embodiment, a temperature sensor may be further provided in the module upper cover 3. When the temperature rises to reach a set temperature value, the temperature sensor controls the operation of the centrifugal fan through a signal, thereby achieving automatic heat dissipation.

[0046] In addition, a fixed support plate 15 is provided in the groove 11, and a countersunk hole 16 corresponding to the battery cell 21 is provided on the surface of the support plate 15. A heat dissipation port 17 is provided on the surface of the support plate 15, and the heat dissipation port 17 penetrates the support plate 15. The nozzle 14 extends vertically into the heat dissipation port 17, and the heat dissipation port 17 corresponds to the nozzle 14 below.

[0047] The setting of the support plate 15 can not only improve the restriction of the gas flow direction, but also limit the battery cell 21; since the support plate 15 is provided with a heat dissipation port 17, and the nozzle 14 extends vertically into the heat dissipation port 17; therefore, when the gas is ejected from the nozzle, it can be directly blown to the top of the support plate 15 (between the two battery cells 21), avoiding the gas from flowing around and ensuring the heat dissipation quality.

[0048] The battery cell 21 is limited in the battery module 2 by the side plate 22, the end plate 23 and the partition 25. In this state, the circumference of the battery cell 21 is in contact with the end plate 23 and the partition 25, which can prevent the battery cell 21 from swaying horizontally or deviating from the original position, but the battery cell 21 may move up and down. In order to prevent the battery cell 21 from moving up and down, a countersunk hole 16 is set on the surface of the support plate 15. The bottom of each battery cell 21 is set in the countersunk hole 16, and the top is blocked by the module cover, which can ensure the multi-directional limitation of the battery cell up and down, left and right, and improve the overall stability. That is to say, all the battery cells 21 in the battery module 2 fall into the corresponding countersunk holes 16, and the side plates and end plates around the battery module 2 are welded or glued to the surface of the module support plate 1 to ensure the overall stability of the battery module.

[0049] Please refer again Figure 4-6 A notch 41 corresponding to the air outlet groove 31 is provided on one side of the protective cover 4, and an extended heat dissipation channel 42 is provided on the inner side of the notch 41. The port of the heat dissipation channel 42 covers the air outlet groove 31 and is used to receive the heat dissipation gas in the battery module 2; when the centrifugal fan 7 is running, the gas passes through the second air collecting channel 71, the first air collecting channel 6, the connecting elbow 61, the connecting pipe 12, the branch pipe 13, the nozzle 14, the air outlet groove 31 and the heat dissipation channel 42 in sequence, and is dispersed outward at the notch 41. Such a cycle can achieve heat dissipation of all internal battery modules. The inner top wall of the protective cover 4 is provided with a support mechanism 43 for protecting the battery module 2. The setting of the support mechanism 43 can prevent the protective cover 4 from deforming and squeezing the internal battery module.

[0050] Specifically, the support mechanism 43 includes an upper elastic fin 431 and a lower elastic fin 432 made of carbon spring steel. The upper elastic fin 431 and the lower elastic fin 432 are both arc-shaped and symmetrically arranged. A cross groove 433 is provided in each of the upper elastic fin 431 and the lower elastic fin 432. The upper elastic fin 431 and the lower elastic fin 432 are cross-arranged in opposite directions at the cross groove 433. Connecting plates 434 are provided at both ends of the cross groove 433. The connecting plates 434 are provided with waist holes 435. The upper elastic fin 431 is connected to the inner top wall of the protective cover 4 at the waist holes 435 by bolts, and the lower elastic fin 432 is connected to the module upper cover 3 at the waist holes 435 by bolts, wherein the lowest point of the upper elastic fin 431 contacts the surface of the module upper cover 3, and the highest point of the lower elastic fin 432 contacts the inner top wall of the protective cover 4.

[0051] The surface of the protective cover 4 will be concave and deformed when impacted by external force. When the protective cover 4 is deformed, the upper elastic fin 431 and the lower elastic fin 432 can extend to both sides through the reaction force, and the overall length of the elastic fin increases. The setting of the upper elastic fin 431 and the lower elastic fin 432 can effectively buffer the external impact force, avoid the deformed part from impacting the battery module, and can also isolate the protective cover and the module upper cover, which can effectively protect the battery module in the protective cover 4.

[0052] In addition, the present invention also discloses an energy storage device of a lithium iron phosphate battery module. Fig.18 The energy storage device includes a module management system, an energy storage inverter, a charge and discharge controller, a DC distributor and auxiliary equipment, wherein multiple battery modules can be placed in the energy storage device, and the module management system manages and monitors the status, temperature, balance and faults of the battery modules to ensure the safe, stable and long-life operation of the battery modules; the energy storage inverter realizes the AC / DC conversion of the charging and discharging process of the battery module, and converts the stored DC power into AC power for use in the power grid or specific loads; the charge and discharge controller monitors the charging and discharging status, current demand, voltage and temperature parameters, and controls the charging current and charging time as needed to ensure the safety performance of the battery module; the DC distributor includes a DC switch, a current sensor and a protector of the control device to ensure the safe and stable transmission of current and electric energy; the auxiliary equipment includes a temperature sensor and a humidity sensor in the energy storage device to realize comprehensive monitoring and management of the system for the overall environmental parameters and power parameters of the energy storage device.

[0053] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A lithium iron phosphate battery module, characterized in that: It comprises a module support plate and a plurality of battery modules above the module support plate, wherein a controller for connecting the plurality of battery modules is arranged on the module support plate, a module upper cover is arranged above the battery module, an air outlet groove is arranged at one end of the module upper cover, a protective cover covering the plurality of battery modules is arranged on the module support plate, a gas circulation and heat dissipation mechanism is arranged inside the battery module, and the heat dissipation gas flows outward at the air outlet groove; the gas circulation and heat dissipation mechanism comprises a connecting pipe and a plurality of branch pipes, the connecting pipe is fixed inside the groove, the plurality of branch pipes are respectively connected with the connecting pipe, the branch pipe is arranged directly below between each two adjacent partitions, a plurality of duckbill-shaped nozzles are arranged in an array above the branch pipe, and the nozzles are arranged between each two adjacent battery cells; The module support plate is also provided with a first air collecting channel, a connecting elbow is provided on one side of the first air collecting channel, one end of the connecting elbow is communicated with the first air collecting channel, and the other end extends into the groove to communicate with the connecting pipe, the connecting elbow and the groove correspond one to one, a centrifugal fan is provided on the bottom surface of the module support plate, the air outlet of the centrifugal fan is communicated with the second air collecting channel, the first air collecting channel is communicated with the second air collecting channel, and the gas flows out from the air outlet groove after the centrifugal fan is operated; a fixed support plate is also provided in the groove, the surface of the support plate is provided with countersunk holes corresponding one to one with the battery cells, the surface of the support plate is also provided with a heat dissipation port, the heat dissipation port penetrates the support plate, the nozzle extends vertically into the heat dissipation port, and the heat dissipation port corresponds one to one with the nozzle below; The inner top wall of the protective cover is provided with a supporting mechanism for protecting the battery module, and the supporting mechanism includes an upper elastic fin and a lower elastic fin, and the upper elastic fin and the lower elastic fin are both provided with two and arc-shaped, and cross grooves are provided in the upper elastic fin and the lower elastic fin. The upper elastic fin and the lower elastic fin are cross-arranged in the cross grooves, and connecting plates are provided at both ends of the cross grooves, and waist holes are provided on the connecting plates. The upper elastic fin is connected to the inner top wall of the protective cover at the waist hole by bolts, and the lower elastic fin is connected to the module upper cover at the waist hole by bolts.

2. The lithium iron phosphate battery module according to claim 1, characterized in that: The battery module includes internal lithium iron phosphate cells, side plates on both sides and end plates at both ends. The cells are arranged in an even-numbered array, with a partition between each two adjacent rows of cells. The adjacent cells on both sides of the partition are connected in series through pole pieces. A first arc-shaped depression is provided on the inner side of the side plate, and a second arc-shaped depression and a third arc-shaped depression are provided on both sides of the partition. The second arc-shaped depression and the third arc-shaped depression are arranged in sequence at intervals. The first arc-shaped depression, the second arc-shaped depression and the third arc-shaped depression are all matched with the outer circumference of the cell, and the two sides of the end plate are welded to the side plate to fix multiple cells.

3. The lithium iron phosphate battery module according to claim 2, characterized in that: The battery cells in every two adjacent rows are spaced apart, with a gap left between two adjacent battery cells in the same row; limiting grooves are downwardly provided at both ends of the partition; the length of the limiting grooves is half the height of the partition; limiting blocks cooperating with the limiting grooves are provided on the inner side of the end plate; the end plate cooperates with all the partitions through the limiting blocks; the limiting grooves and the limiting blocks are both T-shaped; slopes are provided on both sides of the end plate; the side plate and the end plate are welded at the slopes.

4. The lithium iron phosphate battery module according to claim 1, characterized in that: A groove corresponding to the battery module is provided on the surface of the module support plate, and the gas circulation and heat dissipation mechanism is arranged in the groove.

5. The acid-iron lithium battery module according to claim 1, characterized in that: A notch corresponding to the air outlet slot is provided on one side of the protective cover, an extended heat dissipation channel is provided inside the notch, and a port of the heat dissipation channel covers the air outlet slot.

6. An energy storage device according to any one of claims 1 to 5, characterized in that: The energy storage device includes a module management system, an energy storage inverter, a charge and discharge controller, a DC distributor and auxiliary equipment. The module management system manages and monitors the status, temperature, balance and faults of the battery module. The energy storage inverter realizes the charge and discharge process of the battery module. The charge and discharge controller monitors the charge and discharge status, current demand, voltage and temperature parameters. The DC distributor includes a DC switch, a current sensor and a protector of the control device. The auxiliary equipment includes a temperature sensor and a humidity sensor in the energy storage device.

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