Battery pack for energy storage power station and protection system thereof

Abstract

The invention relates to the technical field of battery packs, in particular to a battery pack for an energy storage power station and a protection system thereof.The battery pack comprises a battery cell module and a battery pack shell, a battery monomer sealing shell is arranged outside the battery cell module in a packaging mode, and the battery cell module and the battery monomer sealing shell are both located inside the battery pack shell; a pressure-sensitive circular groove is formed in the upper surface of the battery monomer sealing shell in a penetrating manner, and a floating disc body is arranged in the pressure-sensitive circular groove; according to the battery pack for the energy storage power station, through structural cooperation of the floating disc body, the laser receiver, the laser transmitter and the like, the internal pressure condition of the battery monomers can be visually monitored, and through vertical floating of the floating disc body, the internal pressure fluctuation amplitude of the battery monomers can be weakened.

Description

Technical Field

[0001] The present invention relates to the technical field of battery packs, and in particular to a battery pack for an energy storage power station and a protection system thereof. Background Art

[0002] An energy storage power station is a facility that can store electrical energy. It can store electrical energy when renewable energy is generating sufficient electricity and release electrical energy when it is generating insufficient electricity, effectively regulating the supply and demand of electricity and facilitating large-scale grid connection and efficient utilization of renewable energy. A large number of battery packs constitute the energy storage unit in an energy storage power station, and the battery packs are composed of a large number of battery cells. In order to ensure the energy density of the energy storage power station, a large number of battery cells and battery packs are stacked and arranged. Once an accident such as an explosion occurs, it is very easy to trigger a chain reaction of the surrounding battery cells. Before an abnormal situation occurs in a battery cell, the internal pressure often increases first. The existing technology lacks equipment for monitoring the internal pressure of a battery cell. Traditional pressure sensors are directly arranged inside the battery cell, which will come into contact with the electrolyte to cause corrosion and short circuit problems, affecting the performance of the battery cell. Summary of the invention

[0003] The object of the present invention is to provide a battery pack for an energy storage power station and a protection system thereof to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a battery pack for an energy storage power station, comprising a battery cell module and a battery pack shell, the external packaging of the battery cell module is provided with a battery cell shell, the battery cell module and the battery cell shell are both located inside the battery pack shell, a pressure-sensitive circular groove is penetrated through the upper surface of the battery cell shell, a floating disc is provided in the pressure-sensitive circular groove, the pressure-sensitive circular groove and the floating disc are coaxially arranged, and a corrugated connecting ring is provided between the pressure-sensitive circular groove and the floating disc for sealing connection, the floating disc can move along the axial direction of the pressure-sensitive circular groove through the elastic deformation of the corrugated connecting ring, a docking top sleeve is fixedly provided on the inner surface of the battery pack shell, the docking top sleeve sealing cover is provided above the pressure-sensitive circular groove, a laser transmitter and a laser receiver are embedded and installed on the surface of the docking top sleeve, a reflective patch is affixed to the upper surface of the floating disc, the laser transmitter emits laser to irradiate the reflective patch, the reflective patch reflects the laser to the laser receiver, and the laser receiver is used to detect the position of the laser reflected by the reflective patch.

[0005] A mounting ring body is arranged above the corrugated connecting ring, a spur portion is fixedly arranged on the lower surface of the mounting ring body, the spur portion is evenly distributed in a circular array on the mounting ring body, a ring body bracket is fixedly arranged on the mounting ring body, and a special-shaped piston portion is fixedly arranged on the ring body bracket.

[0006] A conformable plug cover is fixedly provided on the inner surface of the battery pack housing, and the conformable plug cover is located in the inner area of ​​the docking top sleeve. The special-shaped piston part is located inside the conformable plug cover, and the special-shaped piston part is in sealing contact with the conformable plug cover. A primary mixed gunpowder is fixedly provided above the special-shaped piston part, and the primary mixed gunpowder is detonated by electric control.

[0007] The outside of the docking top sleeve is connected with a pressure relief branch pipe, the surface of the battery pack shell is fixedly provided with a transverse pipeline, the pressure relief branch pipe is connected with the transverse pipeline, the surface of the battery pack shell is provided with an external connection screw hole, and the external connection screw hole is connected with the transverse pipeline.

[0008] An isolation one-way eave is fixedly provided inside the pressure relief branch pipe, and an isolation matching plug is provided on the side of the isolation one-way eave away from the location of the docking top sleeve. A pipeline support rod is fixedly provided inside the pressure relief branch pipe, and a compression spring is provided between the pipeline support rod and the isolation matching plug. The compression spring applies elastic pressure to the isolation matching plug, so that the isolation matching plug contacts and seals with the isolation one-way eave.

[0009] A bottom convex portion is fixedly provided on the lower surface of the pressure relief branch pipe, an inner-tube recess is provided in the bottom convex portion, the inner-tube recess is communicated with the inner cavity of the pressure relief branch pipe, a packaging pressure plate is fixedly provided in the inner-tube recess, and the packaging pressure plate is arranged parallel to the length direction of the pressure relief branch pipe.

[0010] An impact plug body is arranged in the in-tube trough, and the impact plug body limiter is arranged below the packaging pressure plate. The impact plug body is in sealing contact with the inner wall surface of the in-tube trough and the lower surface of the packaging pressure plate. A secondary mixed gunpowder is arranged inside the in-tube trough. The secondary mixed gunpowder is located in the closed space formed by the packaging pressure plate, the impact plug body and the in-tube trough, and the secondary mixed gunpowder is detonated by electric control.

[0011] A driving push plate is fixedly arranged on the surface of the impact plug body, an extrusion slope is opened on the driving push plate, and a rotating push shaft is fixedly arranged on the mounting ring body; when the secondary mixed gunpowder is electrically detonated, the secondary mixed gunpowder pushes the impact plug body to move along the length direction of the pressure relief branch pipe through the explosion impact, so that the driving push plate and the extrusion slope move synchronously, the extrusion slope can be in extrusion contact with the rotating push shaft, and the rotating push shaft is pushed by the extrusion slope so that the rotating push shaft and the mounting ring body rotate together by a certain angle.

[0012] A mating convex ring is fixedly provided on the upper surface of the battery cell shell, and the mating convex ring is coaxially corresponding to the pressure-sensitive circular groove. The lower end of the docking top sleeve is docked with the mating convex ring. A mounting seat is fixedly provided on the surface of the docking top sleeve, and the laser emitter is embedded and installed in the mounting seat.

[0013] A protection system includes a battery pack for an energy storage power station, a central processing module and an alarm prompt module. The central processing module is used to receive data and perform command control on the battery pack for the energy storage power station. When the battery pack for the energy storage power station is abnormal, the central processing module can control the alarm prompt module to sound an alarm.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The battery pack for the energy storage power station of the present invention can intuitively monitor the internal pressure of the battery cell by cooperating with the structures such as the floating disk, the laser receiver and the laser transmitter, and the internal pressure fluctuation amplitude of the battery cell can be weakened by the up and down floating of the floating disk. When the internal pressure of the battery cell increases, the internal volume of the battery cell is increased by the floating of the floating disk, thereby weakening the pressure change, making the internal pressure of the battery cell more stable and improving safety.

[0015] The present invention cooperates with the structures such as the mounting ring body, the conformable plug cover and the pressure relief branch pipe, etc., and can control the first-level mixed gunpowder and the second-level mixed gunpowder to detonate in sequence when the internal pressure of the battery cell is detected to be too high and exceeds the set threshold. The first-level mixed gunpowder drives the spur part to move down and insert it into the corrugated connecting ring, and the second-level mixed gunpowder drives the spur part to rotate, thereby actively separating the floating disc body, so that the internal pressure of the battery cell can be actively released, reducing the probability of the diaphragm being squeezed due to the high pressure inside the battery cell, destroying its function of isolating the positive and negative electrodes and causing a violent short-circuit reaction, and generating a vicious cycle of thermal runaway; and in the case of thermal runaway explosion, the flame spray can also be limited and guided by the docking top sleeve and the pressure relief branch pipe, so as to reduce the impact on the surrounding battery cells and reduce losses. The present invention uses the method of actively cutting off the corrugated connecting ring by the spur part to actively release pressure, so that when the battery cell is produced and packaged, the floating disc body and the corrugated connecting ring can be completely welded and sealed to ensure the sealing of the battery cell shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 It is a schematic diagram of the upper portion of the battery pack housing of the present invention.

[0018] Figure 3 for Figure 2 A magnified schematic diagram of area A in the middle.

[0019] Figure 4 It is a three-dimensional half-section schematic diagram of the floating disk body of the present invention.

[0020] Figure 5 for Figure 4 Enlarged schematic diagram of area B in the middle.

[0021] Figure 6 for Figure 4 Enlarged schematic diagram of area C in the middle.

[0022] Figure 7 It is a three-dimensional half-section front view of the floating disk body of the present invention.

[0023] Figure 8 for Figure 7 Enlarged schematic diagram of area D in the middle.

[0024] In the figure: 1, battery module; 2, battery cell shell; 3, battery pack shell; 4, pressure-sensitive circular groove; 5, floating disc; 6, corrugated connecting ring; 7, docking top sleeve; 8, laser transmitter; 9, laser receiver; 10, reflective patch; 701, mounting ring body; 702, stab part; 703, ring body bracket; 704, special-shaped piston part; 705, conformable plug cover; 706, primary mixed gunpowder; 707, pressure relief branch pipe; 708, transverse pipeline; 709, external connection screw hole; 710, isolation one-way eaves; 711, isolation matching plug; 712, pipeline support rod; 713, compression spring; 714, bottom convex part; 715, inner groove of the pipe; 716, packaging pressure plate; 717, impact plug body; 718, secondary mixed gunpowder; 719, driving push plate; 720, extrusion slope; 721, rotating push shaft; 401, matching convex ring; 801, mounting seat. DETAILED DESCRIPTION

[0025] 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.

[0026] See also Figures 1 to 8 The present invention provides a technical solution: a battery pack for an energy storage power station, such as Figure 4 As shown in the figure, it includes a battery cell module 1 and a battery pack shell 3. The battery cell module 1 includes positive and negative electrodes, a separator and an electrolyte of the battery. The external packaging of the battery cell module 1 is provided with a battery cell shell 2. The battery cell module 1 and the battery cell shell 2 together constitute a battery cell.

[0027] The cell module 1 and the battery cell shell 2 are both located inside the battery pack housing 3. A pressure-sensitive circular groove 4 is formed on the upper surface of the battery cell shell 2. A floating plate 5 is disposed in the pressure-sensitive circular groove 4. The pressure-sensitive circular groove 4 and the floating plate 5 are coaxially disposed. A corrugated connecting ring 6 is provided between the pressure-sensitive circular groove 4 and the floating plate 5 for sealing connection. The corrugated connecting ring 6 is as shown in FIG. Figure 5As shown in , the cross-section is corrugated, and the floating disk body 5 can move along the axial direction of the pressure-sensitive circular groove 4 through the elastic deformation of the corrugated connecting ring 6. A docking top sleeve 7 is fixedly provided on the inner surface of the battery pack shell 3. The sealing cover of the docking top sleeve 7 is arranged above the pressure-sensitive circular groove 4. A laser transmitter 8 and a laser receiver 9 are embedded and installed on the surface of the docking top sleeve 7. A reflective patch 10 is affixed to the upper surface of the floating disk body 5. The laser transmitter 8 emits laser to irradiate the reflective patch 10, and the reflective patch 10 reflects the laser to the laser receiver 9. The laser receiver 9 is used to detect the position of the laser reflected by the reflective patch 10.

[0028] A mounting ring body 701 is arranged above the corrugated connecting ring 6, and a spur portion 702 is fixedly arranged on the lower surface of the mounting ring body 701. The spur portions 702 are evenly distributed in a circumferential array on the mounting ring body 701. A ring body bracket 703 is fixedly arranged on the mounting ring body 701, and a special-shaped piston portion 704 is fixedly arranged on the ring body bracket 703. A conformable plug cover 705 is fixedly arranged on the inner surface of the battery pack housing 3. The conformable plug cover 705 is located in the inner area of ​​the docking top sleeve 7. The special-shaped piston portion 704 is located inside the conformable plug cover 705. The special-shaped piston portion 704 is in sealing contact with the conformable plug cover 705. A primary mixed gunpowder 706 is fixedly arranged above the special-shaped piston portion 704, and the primary mixed gunpowder 706 is detonated by electric control.

[0029] A pressure relief branch pipe 707 is provided for external connection with the docking top sleeve 7, a transverse pipeline 708 is fixedly provided on the surface of the battery pack shell 3, the pressure relief branch pipe 707 is connected with the transverse pipeline 708, an external connecting screw hole 709 is provided on the surface of the battery pack shell 3, the external connecting screw hole 709 is connected with the transverse pipeline 708, when the energy storage power station is constructed, the metal pipe is matched with the external connecting screw hole 709 to guide the explosion flame spray.

[0030] An isolation one-way eaves 710 is fixedly provided inside the pressure relief branch pipe 707, and an isolation matching plug 711 is provided on the side of the isolation one-way eaves 710 away from the position of the docking top sleeve 7. A pipeline support rod 712 is fixedly provided inside the pressure relief branch pipe 707, and a compression spring 713 is provided between the pipeline support rod 712 and the isolation matching plug 711. The compression spring 713 applies elastic pressure to the isolation matching plug 711, so that the isolation matching plug 711 is in contact and sealed with the isolation one-way eaves 710. The above-mentioned structure is set up to isolate different battery cells. When the battery cells explode, the explosion flame enters the pressure relief branch pipe 707 through the docking top sleeve 7, and then enters the interior of the cross-through pipeline 708. Due to the one-way passability of the isolation matching plug 711, the flame will not pass through the other pressure relief branch pipes 707 in the reverse direction.

[0031] A bottom convex portion 714 is fixedly provided on the lower surface of the pressure relief branch pipe 707, and an inner tube sinking groove 715 is provided in the bottom convex portion 714. The inner tube sinking groove 715 is communicated with the inner cavity of the pressure relief branch pipe 707, and a packaging pressing plate 716 is fixedly provided in the inner tube sinking groove 715. The packaging pressing plate 716 is arranged parallel to the length direction of the pressure relief branch pipe 707. An impact plug body 717 is arranged in the inner tube sinking groove 715, and the impact plug body 717 is limitedly arranged below the packaging pressing plate 716. The impact plug body 717 is in sealing contact with the inner wall surface of the inner tube sinking groove 715 and the lower surface of the packaging pressing plate 716. A secondary mixed gunpowder 718 is arranged inside the inner tube sinking groove 715. The secondary mixed gunpowder 718 is located in a closed space formed by the packaging pressing plate 716, the impact plug body 717 and the inner tube sinking groove 715, and the secondary mixed gunpowder 718 is detonated by electric control.

[0032] A driving push plate 719 is fixedly arranged on the surface of the impact plug body 717, and an extrusion slope 720 is opened on the driving push plate 719, and a rotating push shaft 721 is fixedly arranged on the mounting ring body 701; when the secondary mixed gunpowder 718 is electrically controlled to be detonated, the secondary mixed gunpowder 718 pushes the impact plug body 717 to move along the length direction of the pressure relief branch pipe 707 through the explosion impact, so that the driving push plate 719 and the extrusion slope 720 move synchronously, and the extrusion slope 720 can be extruded and contacted with the rotating push shaft 721, and the rotating push shaft 721 is pushed by the extrusion slope 720 so that the rotating push shaft 721 and the mounting ring body 701 rotate together by a certain angle.

[0033] A mating convex ring 401 is fixedly provided on the upper surface of the battery cell shell 2, and the mating convex ring 401 is coaxially corresponding to the pressure-sensitive circular groove 4. The lower end of the docking top sleeve 7 is docked with the mating convex ring 401, and a mounting seat 801 is fixedly provided on the surface of the docking top sleeve 7, and the laser emitter 8 is embedded and installed in the mounting seat 801.

[0034] A protection system includes a battery pack for an energy storage power station, a central processing module and an alarm prompt module. The central processing module includes a logic processor and an additional circuit. The alarm prompt module is composed of a buzzer. The central processing module is used to receive data and control instructions for the battery pack for the energy storage power station. When the battery pack for the energy storage power station is abnormal, the central processing module can control the alarm prompt module to sound an alarm.

[0035] When the battery pack for energy storage power station of the present invention is in use, when the internal pressure of the battery cell shell 2 changes, the floating disc 5 moves up and down through the deformation of the corrugated connecting ring 6. Since the laser emitter 8 emits light to the reflective patch 10, and the light is reflected to the laser receiver 9 through the reflective patch 10, when the floating disc 5 drives the reflective patch 10 to move up and down, the point where the laser is reflected on the laser receiver 9 will change, and the position of the laser is detected in real time by the laser receiver 9, so as to detect the internal pressure of the battery cell shell 2; the specific correlation between the point where the laser is reflected on the laser receiver 9 and the pressure value inside the battery cell shell 2 is obtained by drawing a curve graph through experiments, and then judged according to the curve graph. By floating up and down the floating disc 5, the internal pressure fluctuation amplitude of the battery cell shell 2 can be weakened. For example, when the internal pressure of the battery cell shell 2 increases, the internal volume of the battery cell shell 2 is increased by floating the floating disc 5, thereby weakening the pressure change, so that the internal pressure of the battery cell shell 2 is more stable. The positive or negative pressure inside the battery cell shell 2 will bring certain negative effects. When the internal pressure of the battery cell shell 2 is positive, the slightly higher internal pressure will change the charge and discharge curve of the battery, increase the risk of leakage of the battery cell shell 2, and increase the probability of bulging; when the internal pressure of the battery cell shell 2 is negative, the air outside the battery may be sucked into the battery; the diaphragm may have local wrinkles or displacement due to insufficient pressure support, increasing the risk of direct contact between the positive and negative electrodes.

[0036] like Figure 5 As shown in , the laser receiver 9 feeds back the detection data to the central processing module, and the central processing module monitors the data in real time. When the internal pressure of the battery cell shell 2 exceeds the set value, the central processing module first controls the primary mixed gunpowder 706 to detonate, and then controls the secondary mixed gunpowder 718 to detonate; at the same time, a signal is sent to the alarm prompt module, so that the alarm prompt module alarms and prompts the on-site staff. When the primary mixed gunpowder 706 is electrically controlled to detonate, the special-shaped piston part 704 will drive the mounting ring body 701 and the spur part 702 to move downward under the impact of the explosion, so that the spur part 702 is inserted into the corrugated connecting ring 6, and the corrugated connecting ring 6 is penetrated, and the special-shaped piston part 704 moves down from the conformal plug cover 705 to break away from the limit.

[0037] When the secondary mixed gunpowder 718 is electrically detonated, Figure 6As shown in , the impact plug body 717 is driven to move rightward by the impact force, driving the driving push plate 719 to move rightward. At this time, since the rotating push shaft 721 just corresponds to the height of the extrusion slope 720 after moving down, the extrusion slope 720 can be squeezed and contacted with the rotating push shaft 721, and the rotating push shaft 721 is pushed by the extrusion slope 720 so that the rotating push shaft 721 and the mounting ring body 701 rotate together by a certain angle. At this time, the thorn part 702 separates the corrugated connecting ring 6. The internal pressure of the battery cell shell 2 can be actively released, reducing the high pressure inside the battery cell shell 2, which causes the diaphragm to be squeezed, destroying its function of isolating the positive and negative electrodes and causing a violent short-circuit reaction, resulting in the probability of a thermal runaway vicious cycle; and in the case of thermal runaway explosion, the flame spray can also be limited and guided by the docking top sleeve 7 and the pressure relief branch pipe 707 and other structures to reduce the impact on the surrounding battery cells.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A battery pack for an energy storage power station, comprising a battery cell module (1) and a battery pack casing (3), wherein the battery cell module (1) is externally packaged with a battery cell casing (2), and the battery cell module (1) and the battery cell casing (2) are both located inside the battery pack casing (3), characterized in that: The upper surface of the battery cell housing (2) is provided with a pressure-sensitive circular groove (4), a floating disc (5) is provided in the pressure-sensitive circular groove (4), the pressure-sensitive circular groove (4) and the floating disc (5) are coaxially arranged, and a corrugated connecting ring (6) is provided between the pressure-sensitive circular groove (4) and the floating disc (5) for sealing connection, the floating disc (5) being able to move along the axial direction of the pressure-sensitive circular groove (4) through the elastic deformation of the corrugated connecting ring (6), and a docking top is fixedly provided on the inner surface of the battery pack housing (3) The butt joint top sleeve (7) has a sealing cover arranged above the pressure-sensitive circular groove (4); a laser emitter (8) and a laser receiver (9) are embedded and installed on the surface of the butt joint top sleeve (7); a reflective patch (10) is attached to the upper surface of the floating disk (5); the laser emitter (8) emits laser light to irradiate the reflective patch (10); the reflective patch (10) reflects the laser light to the laser receiver (9); and the laser receiver (9) is used to detect the position of the laser light reflected by the reflective patch (10).

2. A battery pack for an energy storage power station according to claim 1, characterized in that: A mounting ring body (701) is arranged above the corrugated connecting ring (6); a thorn portion (702) is fixedly arranged on the lower surface of the mounting ring body (701); the thorn portions (702) are evenly distributed in a circular array on the mounting ring body (701); a ring body bracket (703) is fixedly arranged on the mounting ring body (701); and a special-shaped piston portion (704) is fixedly arranged on the ring body bracket (703).

3. A battery pack for an energy storage power station according to claim 2, characterized in that: A conformable plug cover (705) is fixedly arranged on the inner surface of the battery pack housing (3), the conformable plug cover (705) is located in the inner area of ​​the docking top sleeve (7), the special-shaped piston part (704) is located inside the conformable plug cover (705), the special-shaped piston part (704) and the conformable plug cover (705) are in sealed contact, and a primary mixed gunpowder (706) is fixedly arranged above the special-shaped piston part (704), and the primary mixed gunpowder (706) is detonated by electric control.

4. A battery pack for an energy storage power station according to claim 3, characterized in that: The butt-jointed top sleeve (7) is connected to the outside thereof and is provided with a pressure relief branch pipe (707); a transverse pipeline (708) is fixedly provided on the surface of the battery pack housing (3); the pressure relief branch pipe (707) is connected to the transverse pipeline (708); an external connection screw hole (709) is provided on the surface of the battery pack housing (3); the external connection screw hole (709) is connected to the transverse pipeline (708).

5. A battery pack for an energy storage power station according to claim 4, characterized in that: An isolation one-way eave (710) is fixedly provided inside the pressure relief branch pipe (707), an isolation matching plug (711) is provided on a side of the isolation one-way eave (710) away from the location of the docking top sleeve (7), a pipeline support rod (712) is fixedly provided inside the pressure relief branch pipe (707), a compression spring (713) is provided between the pipeline support rod (712) and the isolation matching plug (711), and the compression spring (713) applies elastic pressure to the isolation matching plug (711), so that the isolation matching plug (711) and the isolation one-way eave (710) are in contact and sealed.

6. A battery pack for an energy storage power station according to claim 5, characterized in that: A bottom convex portion (714) is fixedly provided on the lower surface of the pressure relief branch pipe (707), an inner tube recess (715) is provided in the bottom convex portion (714), the inner tube recess (715) is communicated with the inner cavity of the pressure relief branch pipe (707), a packaging pressure plate (716) is fixedly provided in the inner tube recess (715), and the packaging pressure plate (716) is provided in parallel along the length direction of the pressure relief branch pipe (707).

7. A battery pack for an energy storage power station according to claim 6, characterized in that: An impact plug body (717) is arranged in the in-tube trough (715); the impact plug body (717) is limitedly arranged below the packaging pressure plate (716); the impact plug body (717) is in sealing contact with the inner wall surface of the in-tube trough (715) and the lower surface of the packaging pressure plate (716); a secondary mixed gunpowder (718) is arranged inside the in-tube trough (715); the secondary mixed gunpowder (718) is located in a closed space formed by the packaging pressure plate (716), the impact plug body (717) and the in-tube trough (715); and the secondary mixed gunpowder (718) is detonated by electric control.

8. A battery pack for an energy storage power station according to claim 7, characterized in that: A driving push plate (719) is fixedly arranged on the surface of the impact plug body (717), and an extrusion inclined surface (720) is provided on the driving push plate (719). A rotating push shaft (721) is fixedly arranged on the mounting ring body (701). When the secondary mixed gunpowder (718) is electrically detonated, the secondary mixed gunpowder (718) pushes the impact plug body (717) to move along the length direction of the pressure relief branch pipe (707) through the impact of the explosion, so that the driving push plate (719) and the extrusion inclined surface (720) move synchronously, and the extrusion inclined surface (720) can be in extrusion contact with the rotating push shaft (721). The rotating push shaft (721) is pushed by the extrusion inclined surface (720), so that the rotating push shaft (721) and the mounting ring body (701) rotate together by a certain angle.

9. The battery pack for energy storage power station according to claim 1, characterized in that: A matching convex ring (401) is fixedly provided on the upper surface of the battery cell enclosure (2); the matching convex ring (401) corresponds coaxially to the pressure-sensitive circular groove (4); the lower end of the docking top sleeve (7) is docked with the matching convex ring (401); a mounting seat (801) is fixedly provided on the surface of the docking top sleeve (7); and the laser emitter (8) is embedded and mounted in the mounting seat (801).

10. A protection system, characterized in that: It comprises a battery pack for an energy storage power station, a central processing module and an alarm prompt module as described in any one of claims 1 to 9, wherein the central processing module is used to receive data and perform command control on the battery pack for the energy storage power station; when the battery pack for the energy storage power station is abnormal, the central processing module can control the alarm prompt module to sound an alarm.

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