Battery pack and energy storage system

Abstract

The battery pack and energy storage system provided by the present disclosure relates to the technical field of energy storage. The battery pack comprises a battery box, a plurality of battery modules and a fire-fighting module. The outer wall of the battery box encloses a battery compartment, and a fire-fighting hole is formed on the outer wall of the battery box to communicate the battery compartment with the outside of the battery box. The plurality of battery modules are located in the battery compartment. The fire-fighting module comprises a liquid spraying assembly and a detection assembly connected together. The liquid spraying assembly is arranged on the outer wall of the battery box at the fire-fighting hole, and the detection assembly extends into the battery compartment through the fire-fighting hole. The liquid spraying assembly comprises a nozzle located in the battery compartment, and the detection assembly blocks the nozzle. When the temperature in the battery compartment meets a preset condition, the detection assembly opens the nozzle to spray fire-fighting medium into the battery compartment through the nozzle of the liquid spraying assembly to extinguish the fire.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of energy storage, in particular to a battery pack and an energy storage system. BACKGROUND

[0002] At present, in the management of the battery pack, the thermal runaway of the battery cell is one of the potential safety hazards, which may cause fire and even explosion, and seriously affect the safety performance of the battery pack. CONTENT

[0003] The purpose of the present disclosure is to provide a battery pack and an energy storage system.

[0004] According to one aspect of the present disclosure, a battery pack is provided, comprising:

[0005] a battery box, an outer wall of the battery box enclosing a battery compartment, and a fire-fighting hole formed on the outer wall of the battery box and communicating the battery compartment with the outside of the battery box;

[0006] a plurality of battery modules located in the battery compartment;

[0007] a fire-fighting module, the fire-fighting module comprising a liquid spraying assembly and a detection assembly connected together, the liquid spraying assembly being connected to the outer wall at the fire-fighting hole on the battery box, and the detection assembly extending into the battery compartment through the fire-fighting hole; the liquid spraying assembly comprising a nozzle located in the battery compartment, and the detection assembly plugging the nozzle; the detection assembly being configured to open the nozzle to spray fire-fighting medium into the battery compartment through the nozzle of the liquid spraying assembly when the temperature in the battery compartment meets a preset condition.

[0008] In an exemplary embodiment of the present disclosure, the detection assembly comprises a heat-sensitive piece, the heat-sensitive piece plugging the nozzle; when the temperature in the battery compartment meets the preset condition, the heat-sensitive piece separates from the nozzle.

[0009] In an exemplary embodiment of the present disclosure, the heat-sensitive piece is filled with a thermal expansion agent, and when the temperature in the battery compartment meets the preset condition, the heat-sensitive piece is broken under the action of the thermal expansion agent to open the nozzle.

[0010] In an exemplary embodiment of the present disclosure, the detection assembly further comprises a temperature detector, a controller and a heating wire, the heating wire being wound on the heat-sensitive piece; when the temperature detector detects that the temperature in the battery compartment meets the preset condition, the controller controls the heating wire to heat the heat-sensitive piece, and the heat-sensitive piece is broken under the action of the heating wire.

[0011] In an example embodiment of the present disclosure, the detection assembly further comprises a bracket, a fixing block and a pre-tightening screw, one end of the bracket is connected with the liquid spraying assembly, the fixing block is connected with the end of the bracket away from the liquid spraying assembly; the pre-tightening screw is threadedly connected with the fixing block, and the distance between the pre-tightening screw and the nozzle can be adjusted by rotating; one end of the thermal induction piece is in abutment with the nozzle, and the other end is in abutment with the pre-tightening screw.

[0012] In an example embodiment of the present disclosure, the detection assembly further comprises a circuit board and a power supply unit, the power supply unit, the temperature detector and the controller are arranged on the circuit board, and the circuit board is connected to the side of the fixing block away from the bracket.

[0013] In an example embodiment of the present disclosure, the liquid spraying assembly comprises a fixed plate and a nozzle, the fixed plate is connected with the outer wall of the battery box, the nozzle is assembled on the fixed plate, and the nozzle extends into the battery compartment through the fire-fighting hole; the bracket is connected with the fixed plate.

[0014] In an example embodiment of the present disclosure, the liquid spraying assembly further comprises a sealing ring, the sealing ring is located between the fixed plate and the outer wall of the battery box and surrounds the fire-fighting hole.

[0015] In an example embodiment of the present disclosure, the thermal induction piece is a thermal induction glass ball, and the thermal induction glass ball blocks the nozzle.

[0016] In an example embodiment of the present disclosure, the thermal induction glass ball is provided with a protective layer at each end, and the thermal induction glass ball is fixed through the protective layer.

[0017] In an example embodiment of the present disclosure, one end of the thermal induction glass ball towards the nozzle is provided with a positioning part, and the positioning part is located in the nozzle when the thermal induction glass ball blocks the nozzle.

[0018] In an example embodiment of the present disclosure, a second sealing ring is arranged between the thermal induction glass ball and the nozzle, and the second sealing ring is configured to seal the gap between the thermal induction glass ball and the nozzle.

[0019] In an example embodiment of the present disclosure, the liquid spraying assembly and the detection assembly are detachably connected.

[0020] In an example embodiment of the present disclosure, the liquid spraying assembly and the battery box are detachably connected.

[0021] In an example embodiment of the present disclosure, the projection of the fire hole on a preset reference plane completely covers the projection of the detection assembly on the preset reference plane in the radial direction of the fire hole.

[0022] In an example embodiment of the present disclosure, the preset condition is that the temperature is greater than or equal to 65-75°C.

[0023] According to another aspect of the present disclosure, a battery pack is provided.

[0024] The battery pack provided by the present disclosure can obtain the real-time temperature in the battery compartment through the detection assembly. When the temperature in the battery compartment is greater than or equal to the preset temperature, the detection assembly opens the nozzle of the liquid spraying assembly to spray the fire-fighting medium into the battery compartment through the nozzle of the liquid spraying assembly, so as to cool the battery compartment in time and avoid fire or explosion caused by out-of-control heat management. When a fire occurs in the battery pack, the fire can be extinguished through the nozzle to improve the safety performance of the battery pack. Meanwhile, the fire-fighting module includes the liquid spraying assembly and the detection assembly connected together, that is, the detection and fire-fighting functions are integrated in one module. When the battery box is installed, only one component needs to be fixed to realize all functions, which is less in components, low in cost, and convenient in installation process. In addition, the maintenance period of the detector for fire-fighting is generally about four years, but the service life of the energy storage system is about twenty years, which is much longer than the maintenance period of the detector. The fire-fighting module provided by the present disclosure is assembled on the outer wall of the fire hole of the battery box through the liquid spraying assembly, and the detection assembly can be inserted into the battery compartment through the fire hole, that is, the fire-fighting module is fixed from the outside of the battery box, so that the fire-fighting module can be replaced without disassembling the battery pack, which is convenient to disassemble and high in maintenance economy.

[0025] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0026] The drawings incorporated into the specification and constituting a part of the specification show embodiments consistent with the present disclosure and, together with the specification, serve to explain the principles of the present disclosure. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0027] Figure 1 The schematic diagram of the energy storage system provided for an embodiment of the present disclosure.

[0028] Figure 2 The schematic diagram of the battery pack provided for an embodiment of the present disclosure.

[0029] Figure 3 An exploded view of the battery pack provided for an embodiment of the present disclosure.

[0030] Figure 4 An enlarged view of part A in Figure 2

[0031] Figure 5 An enlarged view of part B in Figure 3

[0032] Figure 6 A side view of the battery pack provided for an embodiment of the present disclosure.

[0033] Figure 7 A cross-sectional view at C-C in Figure 6

[0034] Figure 8 An enlarged view of part D in Figure 7

[0035] Figure 9 A schematic view of the fire-fighting module provided for an embodiment of the present disclosure.

[0036] Figure 10 A schematic view of the fire-fighting module from another perspective provided for an embodiment of the present disclosure.

[0037] Figure 11 A side view of the fire-fighting module provided for an embodiment of the present disclosure.

[0038] Figure 12 An exploded view provided for an embodiment of the present disclosure.

[0039] Figure 13 An enlarged view of part E in Figure 12

[0040] A front view of the fire-fighting module provided for an embodiment of the present disclosure. Figure 14

[0041] An enlarged view of part F in Figure 15 Figure 14

[0042] 10, energy storage device; 20, power grid; 30, first electric energy conversion device; 40, second electric energy conversion device;

[0043] 100, battery pack;

[0044] 110, battery box; 111, lower box; 112, box cover; 1120, fire-fighting hole; 113, battery compartment;

[0045] 120, battery module; ​​​​​​

[0046] 130. fire-fighting module;

[0047] 131. liquid spraying assembly; 1311. fixing plate; 1312. connecting nozzle; 1313. nozzle; 1314. first sealing ring; 1315. valve core;

[0048] 132. detection assembly; 1321. heat-sensitive glass ball; 13211. heating wire; 13212. first protective layer; 13213. second protective layer; 13214. positioning portion; 1322. support; 1323. fixing block; 1324. circuit board; 1325. power supply unit; 1326. pre-tightening screw; 1327. threaded connecting piece; 1328. second sealing ring. DETAILED DESCRIPTION

[0049] Example embodiments now will be described more fully hereinafter with reference to the accompanying drawings. Example embodiments, however, can be implemented in many different forms and should not be construed as limited to the implementations set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. Like reference numerals refer to like elements throughout the figures, and thus a detailed description of them will not be repeated.

[0050] Since the energy required by people has strong time and space, in order to reasonably use energy and improve the utilization rate, it is necessary to store the energy in the form of one energy form or converted into another energy form through a medium or device, and then release it in a specific energy form based on future application.

[0051] At present, green energy mainly includes light energy, wind energy, etc., and light energy and wind energy have the problems of strong intermittency and large fluctuation, which will cause the voltage instability of green power grid (not enough electricity at peak electricity consumption time, and too much electricity at low electricity consumption time), and the unstable voltage will cause damage to electricity, so it may cause the problem of "abandoning wind and light" due to insufficient electricity demand or insufficient grid accommodation capacity.

[0052] In order to solve the problem of insufficient electricity demand or insufficient grid accommodation capacity, it is necessary to rely on energy storage devices. That is, through energy storage devices, the electrical energy is converted into other forms of energy by physical or chemical means, and when needed, the energy stored in the energy storage device is converted into electrical energy and released. In short, the energy storage device is similar to a large "power bank", which stores electrical energy when light energy and wind energy are sufficient, and releases the stored electrical energy when needed.

[0053] The current energy storage (i.e. energy storage) application scenarios are relatively wide, including power generation side energy storage, power grid side energy storage, renewable energy grid-connected energy storage, and user side energy storage, etc. The corresponding types of energy storage devices include:

[0054] (1) Large-scale energy storage power station applied in power generation side energy storage scenarios such as wind power and photovoltaic power stations, which can assist renewable energy power generation to meet grid connection requirements and improve renewable energy utilization rate; as a high-quality active / reactive power regulation power source in the power supply side, the energy storage power station realizes load matching in time and space, enhances renewable energy consumption capacity, reduces instantaneous power changes, reduces the impact on the power grid, improves new energy power generation consumption, and is of great significance in terms of power grid system backup, relieving peak load power supply pressure and peak regulation.

[0055] (2) Large-scale energy storage containers applied in power grid side energy storage scenarios, the main functions of which are peak regulation, frequency regulation, and relieving power grid congestion, which can realize peak clipping and valley filling of power load, that is, charging the energy storage battery when the power load is low, and releasing the stored power during the power load peak period, so as to realize the balance between power production and consumption, such as energy storage power station system.

[0056] (3) Small and medium-sized energy storage cabinets applied in industrial and commercial energy storage scenarios (banks, shopping malls, etc.) on the user side and small household energy storage boxes applied in household energy storage scenarios on the user side, the main functions of which are power self-generation and self-use, peak clipping and valley filling, capacity cost management, and improvement of power supply reliability. According to different application scenarios, the power consumption side energy storage can be divided into industrial and commercial energy storage cabinets, household energy storage devices, and energy storage charging piles, which are generally used with distributed photovoltaic power. Since there is a large price difference between the peak and valley positions of electricity according to the electricity demand, after the user has an energy storage device, in order to reduce costs, the energy storage device (energy storage cabinet / box) is usually charged during the low electricity price period; during the high electricity price period, the electricity in the energy storage device is discharged for use, in order to achieve the purpose of saving electricity costs. In addition, communication base stations, data centers and other fields need to be equipped with energy storage for backup power supply. In addition, in remote areas and areas with high incidence of natural disasters such as earthquakes and hurricanes, the existence of household energy storage devices is equivalent to the user providing backup power supply for himself and the power grid, which eliminates the inconvenience caused by frequent power outages due to disasters or other reasons.

[0057] Figure 1 The schematic diagram of the energy storage system provided for an embodiment of the present disclosure, and the energy storage system of the present disclosure Figure 1 The embodiment takes the shared energy storage scenario of the power generation / distribution side as an example for illustration, and the energy storage system of the present disclosure is not limited to the energy storage scenario of the power generation / distribution side, but can also be applied to scenarios such as industrial and commercial sides or user sides.

[0058] As Figure 1As shown, the energy storage system includes: an energy storage device 10, a power grid 20, a first electric energy conversion device 30, and a second electric energy conversion device 40. In the case of power generation, the first electric energy conversion device 30 and the second electric energy conversion device 40 are used to convert other forms of energy into electric energy, connect with the power grid 20, and supply the power distribution network for use on the power consumption side; when the power consumption load is low and the first electric energy conversion device 30 and the second electric energy conversion device 40 generate excess power, the excess power is stored in the energy storage device 10, reducing the rate of abandoned wind and light, and improving the problem of new energy power generation consumption; when the power consumption load is high, the power grid issues an instruction to transmit the power stored in the energy storage device 10 in cooperation with the power grid 20 in a grid-connected mode to supply the power consumption side, providing peak shaving, frequency modulation, backup and other services for the operation of the power grid 20, fully utilizing the peak shaving function of the power grid 20, promoting the peak shaving and valley filling of the power grid 20, and relieving the power supply pressure of the power grid 20.

[0059] The first electric energy conversion device 30 can be a solar energy conversion device, and the second electric energy conversion device 40 can be a wind energy conversion device. Of course, the electric energy conversion device can also be a device that converts at least one of thermal energy, tidal energy, biomass energy, and mechanical energy into electric energy.

[0060] In combination with the above-mentioned energy storage by physical or electrochemical means, taking electrochemical energy storage as an example, the energy storage device 10 includes at least one chemical battery, which uses chemical elements inside the chemical battery as an energy storage medium to realize the charging and discharging process through chemical reactions or changes of the energy storage medium. In simple terms, the electric energy generated by light energy and wind energy is stored in at least one group of chemical batteries through chemical reactions or changes of the energy storage medium, and when the use of external electric energy reaches a peak, the electric energy stored in the at least one group of chemical batteries is released and used through chemical reactions or changes of the energy storage medium, or transferred to places where electric energy is in short supply for use.

[0061] The energy storage device 10 can be a battery pack composed of battery cells, an energy storage box, an energy storage cabinet, etc. The battery cells can be lithium ion secondary batteries, lithium-sulfur batteries, sodium lithium ion batteries, sodium ion batteries, magnesium ion batteries, etc., and the battery cells can be in the form of a cylinder, a flat body, a cuboid, etc., which is not limited in the embodiments of the present application.

[0062] As shown in FIGS. 1, 2, and 3, the energy storage device 10 can be in the form of a battery pack 100, an energy storage box 200, or an energy storage cabinet 300. Figure 2 As shown in FIGS. 1, 2, and 3, the energy storage device 10 can be in the form of a battery pack 100, an energy storage box 200, or an energy storage cabinet 300. Figure 3 As shown in FIGS. 1, 2, and 3, the energy storage device 10 can be in the form of a battery pack 100, an energy storage box 200, or an energy storage cabinet 300.

[0063] The battery modules 120 accommodated in the battery compartment of the battery box 110 can be at least one, such as one, two, four, five, six, seven, eight or more, and the more the number of battery modules 120, the higher the capacity of the battery pack 100, thereby more easily meeting the market demand.

[0064] The battery module 120 can include a pair of end plates oppositely arranged along the direction of grouping of the battery cells, and a plurality of battery monomers between the pair of end plates. The plurality of battery monomers and the pair of end plates can be fixed by a binding tool such as a cable tie. The plurality of battery monomers are arranged along the length direction of the battery box 110, and the plurality of battery monomers are connected by the cell connecting pieces to realize the series / parallel connection between the plurality of battery monomers.

[0065] The plurality of battery monomers are connected in series, and each cell connecting piece is connected to the electrode terminals of different polarities of two battery monomers; or, the plurality of battery monomers are connected in parallel in groups of two, and then connected in series between groups, and each cell connecting piece is connected to the electrode terminals of the same polarity of two battery monomers, and then connected to the electrode terminals of the opposite polarity of other two battery monomers.

[0066] Since the battery pack usually has a plurality of battery modules, and the plurality of battery modules have a plurality of battery monomers connected in series / parallel, in the management of the battery pack, the thermal runaway of the battery cells is one of the potential safety hazards, which can cause fire and even explosion, and seriously affect the safety performance of the battery pack.

[0067] To solve the above technical problems, the embodiments of the present disclosure provide a battery pack, as shown in Figures 2-10 As shown in the figure, the battery pack 100 includes a battery box 110, a battery module 120 and a fire-fighting module 130. The outer wall of the battery box 110 forms a battery compartment 113, and the outer wall of the battery box 110 forms a fire hole 1120 that communicates the battery compartment 113 with the outside of the battery box 110. The plurality of battery modules 120 are located in the battery compartment 113. The fire-fighting module 130 includes a liquid spraying assembly 131 and a detection assembly 132 connected together. The liquid spraying assembly 131 is connected to the outer wall at the fire hole 1120 of the battery box 110, and the detection assembly 132 extends into the battery compartment 113 through the fire hole 1120. The liquid spraying assembly 131 includes a nozzle located in the battery compartment 113, and the detection assembly 132 blocks the nozzle. The detection assembly 132 is configured to open the nozzle when the temperature in the battery compartment 113 meets a preset condition, so as to spray the fire-fighting medium into the battery compartment 113 through the nozzle of the liquid spraying assembly 131. The temperature in the battery compartment 113 meets the preset condition, for example, the temperature in the battery compartment 113 is greater than or equal to a preset temperature.

[0068] The battery pack 100 disclosed herein includes a detection component 132 capable of acquiring the real-time temperature within the battery compartment 113. When the temperature within the battery compartment 113 is greater than or equal to a preset temperature, the detection component 132 opens the nozzle of the spray component 131 to spray fire-fighting medium into the battery compartment 113, promptly cooling the battery compartment 113 and preventing thermal management runaway that could lead to fire or even explosion. In the event of a fire within the battery pack 100, the nozzle can extinguish the fire, enhancing the safety performance of the battery pack 100. Simultaneously, the fire-fighting module 130 includes the spray component 131 and the detection component 132 connected together, integrating detection and fire-fighting functions into a single module. When installed on the battery housing 110, only one component needs to be fixed to achieve all functions, resulting in fewer components, lower cost, and convenient installation. Furthermore, the maintenance cycle for fire-fighting detectors is generally around four years, but the lifespan of an energy storage system is around twenty years, far exceeding the maintenance cycle of the detectors. The fire-fighting module 130 provided in this disclosure has a spray component 131 mounted on the outer wall of the fire hole 1120 on the battery box 110, and the detection component 132 can be inserted into the battery compartment 113 through the fire hole 1120. That is, the fire-fighting module 130 is fixed from the outside of the battery box 110. The fire-fighting module 130 can be replaced without removing the battery pack 100, which is convenient to disassemble and has high maintenance economy.

[0069] Below, we will combine Figures 4-15 This document provides a detailed description of the fire protection module 130 provided in this publication.

[0070] In one embodiment, such as Figures 4-7 The cover 112 is provided with a fire vent 1120, and the fire extinguishing module 130 is mounted on the cover 112. Typically, the lower housing 111 houses various functional modules of the battery pack 100, such as charging / discharging interfaces, manual maintenance switches (MSDs), and communication interfaces, resulting in limited installation space on the lower housing 111. If the fire extinguishing module 130 is to be installed, the existing structure of the battery pack 100 needs to be modified, leading to higher costs. However, the cover 112 is generally relatively large in height, thus providing more installation space. This allows the fire extinguishing module 130 to be directly mounted on a portion of the battery housing 110, avoiding interference with other components in the battery compartment 113. Furthermore, by mounting the fire extinguishing module 130 on the cover 112, due to gravity, when the fire extinguishing medium is sprayed into the battery compartment 113 through the nozzle, the medium can reach various locations within the battery compartment 113 more effectively, enhancing fire extinguishing capabilities.

[0071] Of course, the fire-fighting module 130 can also be assembled on the lower box body 111. It can be understood that when the battery box 110 is composed of more shells, the fire-fighting module 130 can be arranged on other shells; when multiple fire-fighting modules 130 are arranged on the battery module, the multiple fire-fighting modules 130 can be arranged on the same shell or on different shells, and the present disclosure does not limit this.

[0072] In an embodiment, as shown in Figures 8-12 The liquid injection assembly 131 includes a fixed plate 1311 connected with the outer wall of the battery box 110 and a nozzle 1313 assembled on the fixed plate 1311, and the nozzle 1313 extends into the battery compartment 113 through the fire-fighting hole 1120. The entire fire-fighting module 130 only needs to be assembled on the battery box 110 by fixing a fixed plate 1311, which has fewer components, low cost, and convenient installation process.

[0073] The fixed plate 1311 and the box cover 112 can be fixedly connected by bolts. Through bolt connection, installation is convenient, and subsequent disassembly and maintenance are facilitated. Of course, connection modes such as clamping, direct threaded connection between the fixed plate 1311 and the box cover 112, etc. can also be used for disassembly, and the present disclosure does not limit this.

[0074] The liquid injection assembly 131 further includes a first sealing ring 1314 located between the fixed plate 1311 and the outer wall of the battery box 110 and surrounding the fire-fighting hole 1120. By arranging the first sealing ring 1314, the sealing between the fixed plate 1311 and the box cover 112 can be formed, avoiding the influence of the fire-fighting hole 1120 on the sealing performance of the battery compartment 113. The shape of the first sealing ring 1314 can match the shape of the fixed plate 1311, for example, the outer contours are both rectangular, so as to increase the sealing area and improve the sealing effect. The first sealing ring 1314 can be a rubber ring / matrix, which has long service life and good sealing effect.

[0075] The fixed plate 1311 can be provided with a positioning groove for positioning the first sealing ring 1314, so as to avoid position deviation of the first sealing ring 1314 relative to the fixed plate 1311 during assembly, which is convenient to install, has high assembly precision, and further improves the sealing effect. The depth of the positioning groove is less than the thickness of the first sealing ring 1314, so that the fixed plate 1311 can extrude the first sealing ring 1314 when fixed on the box cover 112.

[0076] Specifically, the outer side of the fixed plate 1311 is provided with a connecting nozzle 1312 for connecting a storage tank of fire-fighting medium. When fire extinguishing is needed, the fire-fighting medium is introduced into the nozzle 1313 through the connecting nozzle 1312.

[0077] The connecting nozzle 1312, the fixed plate 1311 and the nozzle 1313 can be an integral structure, that is, the connecting nozzle 1312, the fixed plate 1311 and the nozzle 1313 are formed by setting a mold in a one-time injection molding process, which can improve the structural strength and the position precision of the connecting nozzle 1312 and the nozzle 1313 on the fixed plate 1311, and at the same time, reduce the production cost. Of course, the connecting nozzle 1312, the fixed plate 1311 and the nozzle 1313 can be a split structure, which are connected together by means of threaded connection, welding, bonding, clamping and the like, and the present disclosure does not limit this.

[0078] As shown in Figure 14 and Figure 15 The valve core 1315 can be arranged in the connecting nozzle 1312, and by arranging the valve core 1315, the speed of the fire-fighting medium sprayed from the nozzle 1313 through the connecting nozzle 1312 can be improved by using the Bernoulli principle, so that the fire-fighting medium can reach each area in the battery compartment 113 faster to improve the fire-fighting effect. Of course, the valve core 1315 can also be arranged in the nozzle 1313.

[0079] In an embodiment, the detection assembly 132 includes a thermal response member that blocks the nozzle; when the temperature in the battery compartment 113 is greater than or equal to a preset temperature, the thermal response member opens the nozzle under the action of the temperature. The thermal response member uses the principle of thermal expansion, and when the temperature is greater than or equal to the preset temperature, the thermal response member breaks or disconnects under the expansion force, so that the part abutting and sealing the nozzle falls off the nozzle, thereby opening the nozzle to spray the fire-fighting medium into the battery compartment 113 through the nozzle. The preset temperature can be 65-75°C, for example, 65°C, 66°C, 67°C, 68°C, 69°C, 70°C, 71°C, 72°C, 73°C, 74°C, 75°C, and the like, which are not listed one by one in the present disclosure. Of course, the preset temperature can also be less than 65°C or greater than 75°C, which can be set according to the actual use conditions of the battery pack 100.

[0080] As shown in Figures 10-13 The thermal response member can be a thermal response glass ball 1321 that blocks the nozzle; when the temperature in the battery compartment 113 is greater than or equal to a preset temperature, the thermal response glass ball 1321 breaks to open the nozzle. The thermal response glass ball 1321 has good thermal sensitivity, and the fragments generated after breaking are insulating members, which will not cause secondary hazards to the battery pack 100.

[0081] In an embodiment, the thermal response member is filled with a thermal expansion agent, and when the temperature in the battery compartment 113 is greater than or equal to a preset temperature, the thermal response member breaks under the action of the thermal expansion agent to open the nozzle by using the principle that the volume of the thermal expansion agent increases under the action of heat. The thermal response member opens the nozzle by using physical control, which has high reliability.

[0082] The thermal induction glass ball 1321 can be filled with a thermal expansion agent. When the temperature in the battery compartment 113 is greater than or equal to a preset temperature, the thermal expansion agent expands in volume under the action of heat, the thermal induction glass ball 1321 is squeezed and broken, and the thermal induction glass ball 1321 is broken to open the nozzle.

[0083] In an embodiment, the detection assembly 132 further includes a temperature detector, a controller, and a heating wire 13211 wound around the thermal induction member. When the temperature detector detects that the temperature in the battery compartment 113 is greater than or equal to a preset temperature, the controller controls the heating wire 13211 to heat the thermal induction member, and the thermal induction member is broken under the action of heating of the heating wire 13211 to open the nozzle. The detector cooperates with the heating wire 13211 to actively control the thermal induction member to open the nozzle, improving the timeliness of fire extinguishing.

[0084] As shown in Figure 12 and Figure 13 , the thermal induction glass ball 1321 can be wound with a heating wire 13211. When the temperature detector detects that the temperature in the battery compartment 113 is greater than or equal to a preset temperature, the controller controls the heating wire 13211 to heat the thermal induction glass ball 1321, and the thermal induction glass ball 1321 expands and finally breaks under the action of heating of the heating wire 13211 to open the nozzle.

[0085] Of course, when the heating wire 13211 is wound on the thermal induction glass ball 1321, the thermal induction glass ball 1321 can be filled with a thermal expansion agent at the same time. Both active and passive methods are used to ensure that the nozzle is opened in time when the battery pack 100 is in thermal runaway, further improving the reliability of fire fighting in the battery pack 100.

[0086] Specifically, as shown in Figure 11 and Figure 12As shown in the figure, the detection assembly 132 further comprises a bracket 1322, a fixing block 1323 and a pre-tightening screw 1326, one end of the bracket 1322 is connected with the liquid injection assembly 131, the fixing block 1323 is connected with the other end of the bracket 1322 away from the liquid injection assembly 131; the pre-tightening screw 1326 is threadedly connected with the fixing block 1323, and the distance between the pre-tightening screw 1326 and the nozzle can be adjusted by rotating; one end of the thermal induction piece abuts against the nozzle, and the other end abuts against the pre-tightening screw 1326. Through the bracket 1322 and the fixing block 1323, a mounting space of the thermal induction glass ball 1321 is formed to abut and block one end of the thermal induction glass ball 1321 on the nozzle and abut and fix the other end on the fixing block 1323; through the pre-tightening screw 1326 on the fixing block 1323, the thermal induction glass ball 1321 can be extruded to move towards the nozzle, thereby realizing pre-tightening of the thermal induction glass ball 1321, sealing the nozzle and stably fixing between the fixing block 1323 and the nozzle 1313.

[0087] As shown in the figure, Figure 11 and Figure 12 As shown in the figure, the detection assembly 132 further comprises a circuit board 1324 and a power supply unit 1325, the power supply unit 1325 and the temperature detector are arranged on the circuit board 1324, and the circuit board 1324 is connected to the side of the fixing block 1323 away from the bracket 1322. When the heating wire 13211 is wound on the pre-tightening screw 1326, the power supply unit 1325 can provide the heating wire 13211 with the required electric energy for heating. The controller and the power supply unit 1325 can be arranged on the circuit board 1324 to realize integrated installation of various functional components, thereby facilitating reduction of the size of the detection assembly 132, so that the detection assembly 132 can smoothly enter and exit the fire-fighting hole 1120 on the box cover 112 to realize convenient disassembly and assembly.

[0088] The temperature detector can be a temperature sensor, which is fixed on the circuit board 1324. The temperature sensor can acquire the temperature of the battery compartment 113 in real time under the power supply of the circuit board 1324 and transmit the acquired temperature information to the controller through the circuit board 1324. The controller has preset processing rules. When the temperature information acquired by the temperature sensor indicates that the temperature in the battery compartment 113 is greater than a preset temperature value, the controller controls the heating wire to heat, so that the thermal induction glass ball 1321 is broken by the heat generated by the heating wire to achieve the purpose of opening the liquid injection port for liquid injection fire-fighting.

[0089] As shown in the figure, Figure 12As shown, the circuit board 1324 is connected with the fixing block 1323 through the threaded connection 1327, and is kept a certain distance between the threaded connection 1327 and the fixing block 1323, so as to avoid the influence of the high temperature generated by the heating wire at the heat-sensitive glass ball 1321 on the circuit board 1324. The threaded connection 1327 has an external threaded column at one end and a threaded hole at the other end. The threaded connection 1327 is connected with the fixing block 1323 through the threaded column, and the circuit board 1324 can be fixed on the other end of the threaded connection 1327 through a screw.

[0090] The projection of the fire hole 1120 on the preset reference plane completely covers the projection of the detection assembly 132 on the preset reference plane in the radial direction of the fire hole 1120, that is, the size of the fire hole 1120 is greater than the size of the outer contour of the detection assembly 132, so as to facilitate the assembly of the detection assembly 132 into the battery compartment 113 through the fire hole 1120 from the outside of the outer wall of the battery box 110. It can be understood that when the fire hole 1120 is a circular hole and the detection assembly 132 is a cylindrical body, the diameter of the fire hole 1120 is greater than the diameter of the detection assembly 132, so that the detection assembly 132 can be inserted into the battery compartment 113 from the periphery of the battery box 110 through the fire hole 1120. The diameter of the fire hole 1120 can be set to be larger, so as to facilitate the entry and exit of the detection assembly 132. The area around the fire hole 1120 on the box cover 112 and the fixing plate 1311 can be sealed by the first sealing ring 1314.

[0091] The fixing plate 1311 can be formed with a positioning boss matching the shape and size of the fire hole 1120. After the fixing plate 1311 is fixedly connected with the box cover 112, the positioning boss is located in the fire hole 1120. The positioning boss can form positioning assembly between the fixing plate 1311 and the box cover 112, so as to improve the assembly efficiency and assembly accuracy. The fire hole 1120 can be a special-shaped hole, and the positioning boss matches the shape of the fire hole 1120, so that the positioning assembly between the positioning boss and the fire hole 1120 is formed in the circumferential direction, so that the mounting position between the positioning boss and the fire hole 1120 is unique, and the assembly efficiency and assembly accuracy are further improved.

[0092] The positioning groove can be formed between the positioning boss and the edge of the fixing plate 1311, so as to position and assemble the first sealing ring 1314; or the first sealing ring 1314 is sleeved on the positioning boss, so as to position and assemble the first sealing ring 1314.

[0093] In an embodiment, the heat-sensitive glass ball 1321 is provided with a protective layer at each end, and the heat-sensitive glass ball 1321 is fixed through the protective layer. For example, Figure 13As shown, the end of the thermal induction glass ball 1321 abutting against the pre-tightening screw 1326 is provided with a first protective layer 13212, and the end abutting against the nozzle 1313 is provided with a second protective layer 13213. Due to the low structural strength of the thermal induction glass ball 1321, it is prone to breakage during assembly, which requires high installation process. By respectively arranging the first protective layer 13212 and the second protective layer 13213 at both ends of the thermal induction glass ball 1321, a buffer is formed when the thermal induction glass ball 1321 abuts against the pre-tightening screw 1326 and the nozzle 1313, avoiding breakage caused by hard contact, and facilitating the fixation of the thermal induction glass ball 1321.

[0094] Among them, the first protective layer 13212 and the second protective layer 13213 can be rubber material, long service life, high reliability, can provide good buffering effect, and will not interfere with the heating and breaking process of the thermal induction glass ball 1321.

[0095] In an embodiment, as shown in Figure 12 As shown, the thermal induction glass ball 1321 and the nozzle are provided with a second sealing ring 1328, and the second sealing ring 1328 is configured to seal the gap between the thermal induction glass ball 1321 and the nozzle, so as to improve the sealing effect of the thermal induction glass ball 1321 on the nozzle.

[0096] Among them, the diameter of the second sealing ring 1328 can be slightly smaller than the diameter of the nozzle, that is, after the thermal induction glass ball 1321 abuts against the nozzle 1313, the second sealing ring 1328 can be located in the nozzle of the nozzle 1313, so that the thermal induction glass ball 1321 can stably extrude the second sealing ring 1328 between the thermal induction glass ball 1321 and the nozzle 1313, further improving the sealing effect.

[0097] Among them, the second sealing ring 1328 can be a rubber ring / pad, long service life, good sealing effect.

[0098] In an embodiment, as shown in Figures 13-15 As shown, the end of the thermal induction glass ball 1321 facing the nozzle is provided with a positioning part 13214, and the positioning part 13214 is located in the nozzle when the thermal induction glass ball 1321 blocks the nozzle. When fixing the thermal induction glass ball 1321, the positioning part 13214 can form positioning assembly between the thermal induction glass ball 1321 and the nozzle 1313, avoiding misalignment between the thermal induction glass ball 1321 and the nozzle 1313, and improving the reliability of assembly.

[0099] Among them, the positioning part 13214 can be a part of the thermal induction glass ball 1321 itself protruding, that is, an integral structure.

[0100] In the description of the disclosure, it should be understood that the terms "first", "second" are used only for descriptive purposes, and are not used to indicate or imply relative importance. The term "multiple" refers to two or more, unless otherwise expressly limited. The terms "mounting", "connecting", "connecting", "fixing" and the like should be interpreted broadly, for example, "connecting" can be fixed connection, can also be detachable connection, or integral connection; "connected" can be directly connected, or indirectly connected through intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the disclosure can be understood according to the specific circumstances.

[0101] In the description of the embodiments of the disclosure, it should be understood that the terms "upper", "lower", "left", "right", "front", "back" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the disclosure and simplifying the description, and do not indicate or imply that the devices or units referred to must have a particular direction, be constructed and operated in a particular orientation, therefore, cannot be understood as a limitation on the embodiments of the disclosure.

[0102] In the description of the disclosure, the description of the terms "one embodiment", "some embodiments", "specific embodiments" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the disclosure. In the description, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0103] Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. The disclosure is intended to cover any variations, uses or adaptations of the disclosure following the general principles thereof and including such departures from the present disclosure that come within known or customary practice in the art to which the disclosure pertains. The specification and examples are to be regarded as illustrative only, and the true scope and spirit of the disclosure are indicated by the appended claims.

Claims

1. A battery pack, characterized by, The application relates to a battery box and a fire-fighting module thereof. The battery box comprises a battery box body, a plurality of battery modules and a fire-fighting module. The battery box body has an outer wall, and a battery compartment is formed by the outer wall. The battery modules are arranged in the battery compartment.

2. The battery pack of claim 1, wherein, The fire-fighting module comprises a spraying assembly and a detecting assembly which are connected together.

3. The battery pack of claim 2, wherein, The spraying assembly is connected with the outer wall at the fire-fighting hole of the battery box body.

4. The battery pack of claim 3, wherein, The detecting assembly extends into the battery compartment through the fire-fighting hole.

5. The battery pack of claim 4, wherein, The spraying assembly comprises a nozzle arranged in the battery compartment.

6. The battery pack of claim 5, wherein, The detecting assembly seals the nozzle.

7. The battery pack of claim 5, wherein, When the temperature in the battery compartment meets a preset condition, the detecting assembly opens the nozzle to spray fire-fighting medium into the battery compartment through the nozzle of the spraying assembly.

8. The battery pack of claim 7, wherein, The detecting assembly comprises a heat-sensitive piece which seals the nozzle.

9. The battery pack of any one of claims 2-8, wherein, When the temperature in the battery compartment meets the preset condition, the heat-sensitive piece separates from the nozzle.

10. The battery pack of claim 9, wherein, The heat-sensitive piece is filled with a thermal expansion agent.

11. The battery pack of claim 9, wherein, When the temperature in the battery compartment meets the preset condition, the heat-sensitive piece is broken under the action of the thermal expansion agent to open the nozzle. The detecting assembly further comprises a temperature detector, a controller and a heating wire. When the temperature detector detects that the temperature in the battery compartment meets the preset condition, the controller controls the heating wire to heat the heat-sensitive piece. The heat-sensitive piece is broken under the action of the heating wire. The detecting assembly further comprises a bracket, a fixing block and a pre-tightening screw. One end of the bracket is connected with the spraying assembly. The fixing block is connected with the other end of the bracket. The pre-tightening screw is threadedly connected with the fixing block. The distance between the pre-tightening screw and the nozzle can be adjusted by rotating the pre-tightening screw. One end of the heat-sensitive piece abuts against the nozzle, and the other end abuts against the pre-tightening screw. The detecting assembly further comprises a circuit board and a power supply unit. The power supply unit, the temperature detector and the controller are arranged on the circuit board. The circuit board is connected to the side of the fixing block away from the bracket. The spraying assembly comprises a fixing plate and a nozzle. The fixing plate is connected with the outer wall of the battery box body. The nozzle is assembled on the fixing plate and extends into the battery compartment through the fire-fighting hole. The bracket is connected with the fixing plate. The spraying assembly further comprises a first sealing ring. The first sealing ring is arranged between the fixing plate and the outer wall of the battery box body and surrounds the fire-fighting hole. The heat-sensitive piece is a heat-sensitive glass ball. The heat-sensitive glass ball seals the nozzle. The heat-sensitive glass ball is fixed through the protective layer. The heat-sensitive glass ball is provided with a positioning part on one end thereof. When the heat-sensitive glass ball seals the nozzle, the positioning part is arranged in the nozzle.

12. The battery pack of claim 9, wherein, A second sealing ring is arranged between the heat-sensitive glass ball and the nozzle, and is configured to seal a gap between the heat-sensitive glass ball and the nozzle.

13. The battery pack of claim 1, wherein, The liquid spraying assembly is detachably connected with the detection assembly.

14. The battery pack of claim 1, wherein, The liquid spraying assembly is detachably connected with the battery box.

15. The battery pack of claim 1, wherein, Along a radial direction of the fire hole, a normal projection of the fire hole on a preset reference plane completely covers a normal projection of the detection assembly on the preset reference plane.

16. The battery pack of claim 1, wherein, The preset condition is that the temperature is greater than or equal to 65℃-75℃.

17. An energy storage system characterized by, The battery pack includes any one of claims 1-16.

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