Battery pack and energy storage system

Abstract

The invention provides a battery pack and an energy storage system, and relates to the technical field of energy storage. The battery pack comprises a battery box body, a plurality of battery modules and a fire-fighting module, a battery bin is defined by the outer wall of the battery box body, a fire-fighting hole communicating the battery bin with the outer side of the battery box body is formed in the outer wall of the battery box body, and the battery modules are located in the battery bin; the fire-fighting module comprises a liquid spraying assembly and a detection assembly which are connected together, the liquid spraying assembly is arranged on the outer wall of the fire-fighting hole in the battery box body, and the detection assembly extends into the battery bin through the fire-fighting hole; the liquid spraying assembly comprises a nozzle located in the battery bin, and the detection assembly blocks the nozzle. And the detection assembly is configured to open the nozzle when the temperature in the battery compartment meets a preset condition, so that a fire-fighting medium is sprayed into the battery compartment through the nozzle of the liquid spraying assembly to extinguish fire.

Description

Technical Field

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

[0002] At present, in battery pack management, thermal runaway of battery cells is one of the potential safety hazards, which may cause fire or even explosion, seriously affecting the safety performance of the battery pack. Summary of the invention

[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, the battery pack comprising:

[0005] A battery box, wherein the outer wall of the battery box encloses a battery compartment, and a fire-fighting hole connecting the battery compartment and the outside of the battery box is formed on the outer wall of the battery box;

[0006] A plurality of battery modules, wherein the plurality of battery modules are located in the battery compartment;

[0007] A fire-fighting module, the fire-fighting module comprising a liquid spray component and a detection component connected together, the liquid spray component being connected to the outer wall at the fire-fighting hole on the battery case, and the detection component extending into the battery compartment through the fire-fighting hole; the liquid spray component comprising a nozzle located in the battery compartment, the detection component blocking the nozzle; the detection component being configured such that when the temperature in the battery compartment meets a preset condition, the detection component opens the nozzle so as to spray a fire-fighting medium into the battery compartment through the nozzle of the liquid spray component.

[0008] In an exemplary embodiment of the present disclosure, the detection assembly includes a heat-sensing component, which blocks the nozzle; when the temperature in the battery compartment meets a preset condition, the heat-sensing component is separated from the nozzle.

[0009] In an exemplary embodiment of the present disclosure, the thermal sensing element is filled with a thermal expansion agent, and when the temperature in the battery compartment meets a preset condition, the thermal sensing element 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 component also includes a temperature detector, a controller and a heating wire, and the heating wire is wound around the heat sensing element; when the temperature detector detects that the temperature in the battery compartment meets a preset condition, the controller controls the heating wire to heat the heat sensing element, and the heat sensing element is broken under the action of the heating of the heating wire.

[0011] In an exemplary embodiment of the present disclosure, the detection assembly also includes a bracket, a fixing block and a pre-tightening screw, one end of the bracket is connected to the spray assembly, and the fixing block is connected to an end of the bracket away from the spray assembly; the pre-tightening screw is threadedly connected to the fixing block, and the distance between the pre-tightening screw and the nozzle can be adjusted by rotation; one end of the heat sensing element abuts the nozzle, and the other end abuts the pre-tightening screw.

[0012] In an exemplary embodiment of the present disclosure, the detection assembly further includes 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 a side of the fixing block away from the bracket.

[0013] In an exemplary embodiment of the present disclosure, the spray assembly includes a fixing plate and a nozzle, the fixing plate is connected to the outer wall of the battery box, the nozzle is mounted on the fixing plate, and the nozzle extends into the battery compartment through the fire hole; the bracket is connected to the fixing plate.

[0014] In an exemplary embodiment of the present disclosure, the liquid spray assembly further includes a sealing ring, which is located between the fixing plate and the outer wall of the battery box and surrounds the fire fighting hole.

[0015] In an exemplary embodiment of the present disclosure, the thermal sensing component is a thermal sensing glass ball, and the thermal sensing glass ball blocks the nozzle.

[0016] In an exemplary embodiment of the present disclosure, protective layers are respectively provided at both ends of the heat-sensitive glass ball, and the heat-sensitive glass ball is fixed by the protective layers.

[0017] In an exemplary embodiment of the present disclosure, a positioning portion is provided on one end of the heat-sensitive glass ball facing the nozzle, and when the heat-sensitive glass ball blocks the nozzle, the positioning portion is located in the nozzle.

[0018] In an exemplary embodiment of the present disclosure, a second sealing ring is provided between the heat-sensitive glass ball and the nozzle, and the second sealing ring is configured to seal a gap between the heat-sensitive glass ball and the nozzle.

[0019] In an exemplary embodiment of the present disclosure, the liquid spraying assembly is detachably connected to the detection assembly.

[0020] In an exemplary embodiment of the present disclosure, the liquid spraying assembly is detachably connected to the battery box.

[0021] In an exemplary embodiment of the present disclosure, along the radial direction of the fire-fighting hole, the orthographic projection of the fire-fighting hole on the preset reference plane completely covers the orthographic projection of the detection assembly on the preset reference plane.

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

[0023] According to another aspect of the present disclosure, there is provided an energy storage system, which includes the above-mentioned battery pack.

[0024] The battery pack provided by the present disclosure has a detection component that can obtain the real-time temperature in the battery compartment. When the temperature in the battery compartment is greater than or equal to the preset temperature, the detection component opens the nozzle of the spray component to spray the fire-fighting medium into the battery compartment through the nozzle of the spray component, and cools down the battery compartment in time to avoid fire or even explosion caused by thermal management out of control; when a fire occurs in the battery pack, the fire can be extinguished in the battery pack through the nozzle to improve the safety performance of the battery pack. At the same time, the fire-fighting module includes a spray component and a detection component connected together, that is, the detection and fire-fighting functions are integrated into one module. When installed on the battery box, only one component needs to be fixed to realize all functions, with fewer components, low cost, and convenient installation process. In addition, the maintenance cycle of the detector used for fire fighting is generally about four years, but the life of the energy storage system is about twenty years, which is much longer than the maintenance cycle of the detector. The fire-fighting module provided by the present invention is assembled on the outer wall of the fire-fighting hole on the battery box through a liquid spray component, and the detection component can extend into the battery compartment through the fire-fighting hole, that is, the fire-fighting module is fixed from the outside of the battery box, and the fire-fighting module can be replaced without removing the battery pack. The disassembly is convenient and the maintenance is highly economical.

[0025] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

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

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

[0029] Figure 3 An exploded view of a battery pack provided in accordance with an embodiment of the present disclosure.

[0030] Figure 4 for Figure 2 The A part in the picture is the enlarged part.

[0031] Figure 5 for Figure 3 The enlarged part of part B.

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

[0033] Figure 7 for Figure 5 Cross-sectional view at CC.

[0034] Figure 8 for Figure 7 An enlarged view of section D in FIG.

[0035] Fig. 9 A schematic diagram of a fire protection module provided for an embodiment of the present disclosure.

[0036] Fig.10 A schematic diagram of a fire protection module from another perspective provided for an embodiment of the present disclosure.

[0037] Fig.11 A side view of a fire protection module provided for one embodiment of the present disclosure.

[0038] Fig.12 An exploded view is provided for one embodiment of the present disclosure.

[0039] Fig.13 for Fig.10 Enlarged view of part E in .

[0040] Fig.14 A front view of a fire protection module provided for an embodiment of the present disclosure.

[0041] Fig.15 for Fig.13 Cross-sectional view at FF.

[0042] 10. Energy storage device; 20. Power grid; 30. First power conversion device; 40. Second power conversion device;

[0043] 100. Battery pack;

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

[0045] 120. Battery module;

[0046] 130. Fire protection module;

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

[0048] 132. Detection component; 1321. Thermal sensing glass ball; 13211. Heating wire; 13212. First protective layer; 13213. Second protective layer; 13214. Positioning portion; 1322. Bracket; 1323. Fixing block; 1324. Circuit board; 1325. Power supply unit; 1326. Pre-tightening screw; 1327. Threaded connector; 1328. Second sealing ring. DETAILED DESCRIPTION

[0049] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be comprehensive and complete and will fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0050] Since the energy people need is highly temporal and spatial, in order to rationally utilize energy and improve utilization, it is necessary to use a medium or device to store one form of energy in the same energy form, or convert it into another form of energy, and then release it in a specific energy form based on future applications.

[0051] At present, green energy mainly includes solar energy, wind energy, etc., which generally have problems of strong intermittency and large volatility, which will cause unstable voltage of the green power grid (not enough electricity during peak hours and too much electricity during low hours). Unstable voltage will cause damage to electricity. Therefore, it may cause the problem of "wind and solar abandonment" due to insufficient electricity demand or insufficient grid acceptance capacity.

[0052] To solve the problem of insufficient electricity demand or insufficient grid acceptance capacity, we must rely on energy storage devices. That is, the energy storage device converts electrical energy into other forms of energy through physical or chemical means and stores it, and then converts the energy stored in the energy storage device into electrical energy when needed. In simple terms, the energy storage device is similar to a large "power bank", which stores electrical energy when there is sufficient light energy and wind energy, and releases the stored electrical energy when needed.

[0053] At present, energy storage (i.e. energy storage) has a wide range of application scenarios, including power generation side energy storage, grid side energy storage, renewable energy grid-connected energy storage and user side energy storage. The corresponding types of energy storage devices include:

[0054] (1) Large-scale energy storage power stations used in energy storage scenarios on the power generation side, such as wind power and photovoltaic power stations, can assist renewable energy generation in meeting grid connection requirements while improving the utilization rate of renewable energy. As a high-quality active / reactive regulating power source on the power supply side, energy storage power stations can achieve load matching of electric energy in time and space, enhance the ability to absorb renewable energy, reduce instantaneous power changes, reduce the impact on the power grid, improve the problem of new energy generation and absorption, and are of great significance in power grid system backup, relieving peak load power supply pressure, and peak and frequency regulation.

[0055] (2) Large energy storage containers used in grid-side energy storage scenarios mainly perform peak load regulation, frequency regulation, and grid congestion relief. Peak load regulation can achieve peak load shaving and valley filling of power loads, that is, charging the energy storage battery when the power load is low and releasing the stored electricity during the peak load period, thereby achieving a balance between power production and consumption, such as energy storage power station systems;

[0056] (3) Small and medium-sized energy storage cabinets used in industrial and commercial energy storage scenarios (banks, shopping malls, etc.) on the user side and small household energy storage boxes used in household energy storage scenarios on the user side. Their main functions are self-generation and self-use of electricity, peak shaving and valley filling, capacity cost management, and improved power supply reliability. According to different application scenarios, energy storage on the power consumption side can be divided into industrial and commercial energy storage cabinets, household energy storage devices, energy storage charging piles, etc., which are generally used in conjunction with distributed photovoltaics. Since there is a large price difference in electricity charges at peak and valley locations according to electricity demand, after users have energy storage devices, in order to reduce costs, they usually charge the energy storage devices (energy storage cabinets / boxes) during the low electricity price period; during the peak electricity price period, the electricity in the energy storage devices is discharged for use to achieve the purpose of saving electricity bills. 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, as well as areas prone to natural disasters such as earthquakes and hurricanes, the existence of household energy storage devices is equivalent to users providing backup power for themselves and the power grid, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0057] Figure 1 A schematic diagram of an energy storage system provided in accordance with an embodiment of the present disclosure, and the present disclosure Figure 1 The embodiment is described by taking the shared energy storage scenario on the power generation / distribution side as an example. The energy storage system disclosed in the present invention is not limited to the energy storage scenario on the power generation / distribution side, but can also be applied to scenarios on the industrial and commercial side or the user side.

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

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

[0060] In combination with the above-mentioned situation of storing energy by physical or electrochemical means, taking electrochemical energy storage as an example, the energy storage device 10 includes at least one chemical battery, using the chemical elements in the chemical battery as the energy storage medium, so as to realize the charging and discharging process through the chemical reaction or change 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 the chemical reaction or change of the energy storage medium, and when the use of external electric energy reaches a peak, the electric energy stored in at least one group of chemical batteries is released for use through the chemical reaction or change of the energy storage medium, or transferred to a place where electric energy is scarce for use.

[0061] The energy storage device 10 may be a battery pack, an energy storage box, an energy storage cabinet, etc., which are composed of battery cells. The battery cells may be lithium-ion secondary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, magnesium-ion batteries, etc., and the battery cells may be cylindrical, flat, rectangular, etc., which are not limited in the embodiments of the present application.

[0062] like Figure 2 and Figure 3 As shown, the energy storage device 10 includes a battery pack 100 as an example. The battery pack 100 includes a battery case 110 and a plurality of battery modules 120. The battery case 110 includes a lower case 111 and a case cover 112. The case cover 112 is fixedly / detachably connected to the lower case 111 to form a battery compartment. The plurality of battery modules 120 are located in the battery compartment.

[0063] Among them, the battery module 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 battery modules 120 there are, the higher the capacity of the battery pack 100 is, which makes it easier to meet market demand.

[0064] Each battery module 120 may include a pair of end plates arranged opposite to each other along the direction of battery cell grouping, and a plurality of battery cells located between the pair of end plates. The plurality of battery cells and the pair of end plates may be fixed by binding tools such as cable ties, and the plurality of battery cells are arranged along the length direction of the battery case 110, and the plurality of battery cells are connected by battery cell connecting sheets to realize series / parallel electrical connection between the plurality of battery cells.

[0065] Among them, multiple battery cells are connected in series in sequence, and each battery cell connecting piece is respectively connected to electrode terminals of different polarities on two battery cells; or, multiple battery cells are connected in parallel in groups of two and then connected in series between groups, and each battery cell connecting piece is firstly connected to electrode terminals of the same polarity on two battery cells, and then connected to electrode terminals of opposite polarity on the other two battery cells.

[0066] Since a battery pack usually has multiple battery modules, and multiple battery cells are connected in series / parallel in the multiple battery modules, thermal runaway of the battery cells is one of the potential safety hazards in battery pack management, which may cause fire or even explosion, seriously affecting the safety performance of the battery pack.

[0067] In view of the above technical problems, the embodiments of the present disclosure provide a battery pack, such as Figure 2 to Figure 10 As shown, the battery pack 100 includes: a battery case 110, a battery module 120 and a fire protection module 130. The outer wall of the battery case 110 encloses a battery compartment 113. A fire protection hole 1120 connecting the battery compartment 113 and the outside of the battery case 110 is formed on the outer wall of the battery case 110, and a plurality of battery modules 120 are located in the battery compartment 113; the fire protection module 130 includes a spray assembly 131 and a detection assembly 132 connected together, the spray assembly 131 is connected to the outer wall of the battery case 110 at the fire protection hole 1120, and the detection assembly 132 extends into the battery compartment 113 through the fire protection hole 1120; the spray 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 so that when the temperature in the battery compartment 113 meets a preset condition, the detection assembly 132 opens the nozzle to spray a fire protection medium into the battery compartment 113 through the nozzle of the spray assembly 131. The temperature in the battery compartment 113 satisfies a 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 provided by the present disclosure, the detection component 132 can obtain the real-time temperature in the battery compartment 113. When the temperature in the battery compartment 113 is greater than or equal to the preset temperature, the detection component 132 opens the nozzle of the spray component 131 to spray the firefighting medium into the battery compartment 113 through the nozzle of the spray component 131, and cools down the battery compartment 113 in time to avoid fire or even explosion caused by thermal management out of control; when a fire occurs in the battery pack 100, the fire can be extinguished in the battery pack 100 through the nozzle to improve the safety performance of the battery pack 100. At the same time, the firefighting module 130 includes a spray component 131 and a detection component 132 connected together, that is, the detection and fire extinguishing functions are integrated into one module. When installed on the battery box 110, only one component needs to be fixed to realize all functions, with fewer components, low cost, and convenient installation process. In addition, the maintenance cycle of the detector used for firefighting is generally about four years, but the life of the energy storage system is about twenty years, which is much longer than the maintenance cycle of the detector. The fire-fighting module 130 provided by the present invention has a spray component 131 mounted on the outer wall of the fire-fighting hole 1120 on the battery case 110, and the detection component 132 can extend into the battery compartment 113 through the fire-fighting hole 1120, that is, the fire-fighting module 130 is fixed from the outside of the battery case 110, and the fire-fighting module 130 can be replaced without disassembling the battery pack 100, which is convenient to disassemble and highly economical to maintain.

[0069] Next, we will combine Figures 4 to 15 , the fire protection module 130 provided by the present disclosure is introduced in detail.

[0070] In one embodiment, if Figures 4 to 7 As described, the box cover 112 is provided with a fire hole 1120, and the fire module 130 is assembled on the box cover 112. Usually, the lower box body 111 is usually provided with various functional modules of the battery pack 100, such as a charging and discharging interface, a manual maintenance switch (MSD), a communication interface, etc., resulting in limited installation space on the lower box body 111. If the fire module 130 needs to be assembled, the existing structure of the battery pack 100 needs to be modified, which is costly. However, the height of the box cover 112 is usually relatively large, so there is more installation space, so it is convenient for the fire module 130 to be directly on the battery box body 110, and it can avoid interference with other components in the battery compartment 113; at the same time, by assembling the fire module 130 on the box cover 112, due to gravity, when the fire medium is sprayed into the battery compartment 113 through the nozzle, the fire medium can better reach various positions in the battery compartment 113 to enhance the fire extinguishing ability.

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

[0072] In one embodiment, if Figure 8 to Figure 12 As shown, the liquid spraying assembly 131 includes a fixing plate 1311 and a nozzle 1313. The fixing plate 1311 is connected to the outer wall of the battery box 110. The nozzle 1313 is assembled on the fixing plate 1311. The nozzle 1313 extends into the battery compartment 113 through the fire hole 1120. The entire fire module 130 can be assembled on the battery box 110 by only fixing a fixing plate 1311, which has few parts, low cost and convenient installation process.

[0073] The fixing plate 1311 and the box cover 112 can be fixedly connected by bolts. The bolt connection is convenient for installation and subsequent disassembly and maintenance. Of course, the fixing plate 1311 and the box cover 112 can also be disassembled by means of clamping, direct thread connection between the fixing plate 1311 and the box cover 112, etc., which is not limited by the present disclosure.

[0074] The liquid spraying assembly 131 further includes a first sealing ring 1314, which is located between the fixing plate 1311 and the outer wall of the battery box 110 and surrounds the fire hole 1120. By setting the first sealing ring 1314, a seal can be formed between the fixing plate 1311 and the box cover 112, so as to avoid the fire hole 1120 affecting the sealing of the battery compartment 113. The shape of the first sealing ring 1314 can match the shape of the fixing plate 1311, for example, the outer contours are rectangular, so as to increase the sealing area and thus improve the sealing effect. The first sealing ring 1314 can be a rubber ring / gasket, which has a long service life and a good sealing effect.

[0075] The fixing plate 1311 may be provided with a positioning groove for positioning the first sealing ring 1314, so as to prevent the first sealing ring 1314 from being offset relative to the fixing plate 1311 during assembly, and the installation is convenient and the assembly precision is high, thereby improving the sealing effect. The depth of the positioning groove is less than the thickness of the first sealing ring 1314, so that when the fixing plate 1311 is fixed on the box cover 112, the first sealing ring 1314 can be squeezed.

[0076] Specifically, a connection nozzle 1312 is provided on the outer side of the fixing plate 1311 , and the connection nozzle 1312 is used to connect to a storage tank of the fire-fighting medium. When fire-fighting is required, the fire-fighting medium flows into the nozzle 1313 through the connection nozzle 1312 .

[0077] Among them, the connecting nozzle 1312, the fixing plate 1311 and the nozzle 1313 can be an integrated structure, that is, the connecting nozzle 1312, the fixing plate 1311 and the nozzle 1313 are formed in an injection molding process by setting a mold, which can improve the structural strength and the position accuracy of the connecting nozzle 1312 and the nozzle 1313 on the fixing plate 1311, and reduce the production cost. Of course, the connecting nozzle 1312, the fixing plate 1311 and the nozzle 1313 can be a split structure, connected together by threaded connection, welding, bonding, clamping, etc., and the present disclosure does not limit this.

[0078] Among them, Fig.14 and Fig.15 As shown, the connection nozzle 1312 may be provided with a valve core 1315. By providing the valve core 1315, the Bernoulli principle can be used to increase the speed at which the firefighting medium is ejected from the nozzle of the nozzle 1313 through the connection nozzle 1312, so that the firefighting medium can reach various areas in the battery compartment 113 more quickly to improve the firefighting effect. Of course, the valve core 1315 can also be provided in the nozzle 1313.

[0079] In one embodiment, the detection assembly 132 includes a heat-sensing component, which blocks the nozzle; when the temperature in the battery compartment 113 is greater than or equal to the preset temperature, the heat-sensing component opens the nozzle under the action of temperature. The heat-sensing component adopts the principle of thermal expansion. When the temperature is greater than or equal to the preset temperature, the heat-sensing component breaks or breaks under the expansion force, so that the part abutting the sealed nozzle falls off from the nozzle, thereby opening the nozzle to spray the fire-fighting medium into the battery compartment 113 through the nozzle. Among them, the preset temperature can be 65℃~75℃, such as 65℃, 66℃, 67℃, 68℃, 69℃, 70℃, 71℃, 72℃, 73℃, 74℃, 75℃, etc., which are not listed one by one in this disclosure. Of course, the preset temperature can also be less than 65℃ or greater than 75℃, which can be set according to the actual use conditions of the battery pack 100.

[0080] Among them, Figure 10 to Figure 13 As shown, the heat-sensing component can be a heat-sensing glass ball 1321, which blocks the nozzle; when the temperature in the battery compartment 113 is greater than or equal to the preset temperature, the heat-sensing glass ball 1321 breaks to open the nozzle. The heat-sensing glass ball 1321 has good thermal sensitivity, and the fragments produced after breaking are insulating parts, which will not cause secondary harm to the battery pack 100.

[0081] In one embodiment, the heat-sensing element is filled with a heat expansion agent. When the temperature in the battery compartment 113 is greater than or equal to a preset temperature, the heat-sensing element is broken by the heat expansion agent to open the nozzle by utilizing the principle that the heat expansion agent expands due to heat. The heat-sensing element opens the nozzle by physical control, which has high reliability.

[0082] The thermal sensing glass ball 1321 may 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 due to heat and increases in volume, thereby squeezing the thermal sensing glass ball 1321 and breaking the thermal sensing glass ball 1321 to open the nozzle.

[0083] In one embodiment, the detection assembly 132 further includes a temperature detector, a controller and a heating wire 13211, and the heating wire 13211 is wound around the heat-sensing element; 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 heat-sensing element, and the heat-sensing element is broken under the heating of the heating wire 13211 to open the nozzle. The detector and the heating wire 13211 are used in conjunction to realize active control of the heat-sensing element to open the nozzle, thereby improving the timeliness of fire extinguishing.

[0084] Among them, Fig.12 and Fig.13 As shown, a heating wire 13211 can be wound around the thermal sensing glass ball 1321. 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 sensing glass ball 1321. The thermal sensing glass ball 1321 expands and finally breaks under the heating of the heating wire 13211 to open the nozzle.

[0085] Of course, when the heating wire 13211 is wound around the thermal sensing glass ball 1321, the thermal expansion agent can be filled in the thermal sensing glass ball 1321 at the same time, using both active and passive methods to ensure that the nozzle is opened in time when thermal runaway of the battery pack 100 occurs, thereby further improving the reliability of fire protection in the battery pack 100.

[0086] Specifically, Fig.11 and Fig.12As shown, the detection component 132 also includes a bracket 1322, a fixing block 1323 and a pre-tightening screw 1326. One end of the bracket 1322 is connected to the spray component 131, and the fixing block 1323 is connected to the end of the bracket 1322 away from the spray component 131; the pre-tightening screw 1326 is threadedly connected to the fixing block 1323, and the distance between the pre-tightening screw 1326 and the nozzle can be adjusted by rotation; one end of the heat sensing element abuts the nozzle, and the other end abuts the pre-tightening screw 1326. An installation space for the thermal sensing glass ball 1321 is formed by the bracket 1322 and the fixing block 1323, so that one end of the thermal sensing glass ball 1321 is abutted and sealed on the nozzle, and the other end is abutted and fixed on the fixing block 1323; through the pre-tightening screw 1326 on the fixing block 1323, the thermal sensing glass ball 1321 can be squeezed to move toward the nozzle, thereby achieving pre-tightening of the thermal sensing glass ball 1321, so that the nozzle is sealed and stably fixed between the fixing block 1323 and the nozzle 1313.

[0087] Among them, Fig.11 and Fig.12 As shown, the detection assembly 132 also includes a circuit board 1324 and a power supply unit 1325. The power supply unit 1325, the temperature detector and the controller are arranged on the circuit board 1324. 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 around the pre-tightening screw 1326, the power supply unit 1325 can provide the heating wire 13211 with the electric energy required for heating. The controller and the power supply unit 1325 can be arranged through the circuit board 1324 to realize the integrated installation of various functional parts, thereby facilitating the reduction of the size of the detection assembly 132, so that the detection assembly 132 can smoothly enter and exit the fire hole 1120 on the box cover 112, and realize convenient disassembly and assembly.

[0088] Among them, the temperature detector can be a temperature sensor, and the temperature sensor is fixed on the circuit board 1324. The temperature sensor can obtain the temperature of the battery compartment 113 in real time under the power supply of the circuit board 1324, and transmit the obtained temperature information to the controller through the circuit board 1324; the processing rules are preset in the controller. When the temperature information obtained by the temperature sensor indicates that the temperature in the battery compartment 113 is greater than the preset temperature value, the controller controls the heating wire to heat, and the heat generated by the heating wire causes the heat-sensitive glass ball 1321 to break, so as to achieve the purpose of opening the spray port for spraying fire.

[0089] Among them, Fig.12As shown, the circuit board 1324 is connected to the fixing block 1323 through a threaded connector 1327, and a certain distance is maintained between the threaded connector 1327 and the fixing block 1323 to prevent the circuit board 1324 from being affected by the high temperature generated by the heating wire at the heat-sensitive glass ball 1321. One end of the threaded connector 1327 is an external thread column, and the other end is formed with a threaded hole; the threaded connector 1327 is connected to the fixing block 1323 through the threaded connector, and the circuit board 1324 can be fixed to the other end of the threaded connector 1327 by screws.

[0090] Among them, along the radial direction of the fire hole 1120, the orthographic projection of the fire hole 1120 on the preset reference plane completely covers the orthographic projection of the detection assembly 132 on the preset reference plane, that is, the size of the fire hole 1120 is larger than the size of the outer contour of the detection assembly 132, so that the detection assembly 132 can be assembled into the battery compartment 113 through the fire hole 1120 from the outer side 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 larger than the diameter of the detection assembly 132, so that the detection assembly 132 can extend from the outer periphery of the battery box 110 through the fire hole 1120 into the battery compartment 113. The diameter of the fire hole 1120 can be set larger to facilitate the entry and exit of the detection assembly 132, and the area surrounding the fire hole 1120 on the box cover 112 and the fixing plate 1311 can be sealed by the first sealing ring 1314.

[0091] Among them, a positioning boss matching the shape and size of the fire hole 1120 can be formed on the fixing plate 1311. After the fixing plate 1311 is fixedly connected to the box cover 112, the positioning boss is located in the fire hole 1120. The positioning boss can form a positioning assembly between the fixing plate 1311 and the box cover 112, thereby improving assembly efficiency and assembly accuracy. Among them, the fire hole 1120 can be a special-shaped hole, and the positioning boss matches its shape, so that the positioning boss and the fire hole 1120 can be positioned in the circumferential direction, so that the installation position between the positioning boss and the fire hole 1120 is unique, further improving assembly efficiency and assembly accuracy.

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

[0093] In one embodiment, protective layers are provided at both ends of the heat-sensitive glass ball 1321, and the heat-sensitive glass ball 1321 is fixed by the protective layers. Fig.13As shown, the end of the heat-sensing glass ball 1321 that abuts against the pre-tightening screw 1326 is provided with a first protective layer 13212, and the end that abuts against the nozzle 1313 is provided with a second protective layer 13213. Since the heat-sensing glass ball 1321 has a low structural strength, it is easy to break during the assembly process, resulting in high requirements for the installation process. By providing the first protective layer 13212 and the second protective layer 13213 at both ends of the heat-sensing glass ball 1321, a buffer can be formed when the heat-sensing glass ball 1321 abuts against the pre-tightening screw 1326 and the nozzle 1313, avoiding easy breakage during hard contact, which is conducive to the fixation of the heat-sensing glass ball 1321.

[0094] The first protective layer 13212 and the second protective layer 13213 can be made of rubber material, which has a long service life and high reliability, can provide a good buffering effect, and will not interfere with the heat-induced breakage process of the thermal-sensitive glass ball 1321 .

[0095] In one embodiment, if Fig.12 As shown, a second sealing ring 1328 is provided between the thermal sensing glass ball 1321 and the nozzle, and the second sealing ring 1328 is configured to seal the gap between the thermal sensing glass ball 1321 and the nozzle to enhance the sealing effect of the thermal sensing 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 sensing 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 sensing glass ball 1321 can stably squeeze the second sealing ring 1328 between the thermal sensing 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 / gasket with long service life and good sealing effect.

[0098] In one embodiment, if Figure 13 to Figure 15 As shown, a positioning portion 13214 is provided on one end of the heat-sensing glass ball 1321 facing the nozzle. When the heat-sensing glass ball 1321 blocks the nozzle, the positioning portion 13214 is located in the nozzle. When the heat-sensing glass ball 1321 is fixed, the positioning portion 13214 can form a positioning assembly between the heat-sensing glass ball 1321 and the nozzle 1313, thereby avoiding misalignment between the heat-sensing glass ball 1321 and the nozzle 1313 and improving assembly reliability.

[0099] The positioning portion 13214 may be a protruding portion of the thermal sensing glass ball 1321 , that is, an integrated structure.

[0100] In the embodiments of the present disclosure, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise expressly defined. Terms such as "installed", "connected", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to the specific circumstances.

[0101] In the description of the embodiments of the present disclosure, it is necessary to understand that the directions or positional relationships indicated by the terms "up", "down", "left", "right", "front", "back", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present disclosure and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation on the embodiments of the present disclosure.

[0102] In the description of this disclosure, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the implementation of the present disclosure. In this specification, the schematic representation 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] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. The present disclosure is intended to cover any variations, uses or adaptations of the present disclosure, which follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The description and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

Claims

1. A battery pack, characterized in that: include: A battery box, wherein the outer wall of the battery box encloses a battery compartment, and a fire-fighting hole connecting the battery compartment and the outside of the battery box is formed on the outer wall of the battery box; A plurality of battery modules, wherein the plurality of battery modules are located in the battery compartment; A fire-fighting module, the fire-fighting module comprising a liquid spray component and a detection component connected together, the liquid spray component being connected to the outer wall at the fire-fighting hole on the battery case, and the detection component extending into the battery compartment through the fire-fighting hole; the liquid spray component comprising a nozzle located in the battery compartment, the detection component blocking the nozzle; the detection component being configured such that when the temperature in the battery compartment meets a preset condition, the detection component opens the nozzle so as to spray a fire-fighting medium into the battery compartment through the nozzle of the liquid spray component.

2. The battery pack according to claim 1, characterized in that: The detection component includes a heat-sensing component, which blocks the nozzle; when the temperature in the battery compartment meets a preset condition, the heat-sensing component is separated from the nozzle.

3. The battery pack according to claim 2, characterized in that: The heat-sensing component is filled with a heat expansion agent. When the temperature in the battery compartment meets a preset condition, the heat-sensing component is broken under the action of the heat expansion agent to open the nozzle.

4. The battery pack according to claim 3, characterized in that: The detection component also includes a temperature detector, a controller and a heating wire, and the heating wire is wound around the heat-sensing component; when the temperature detector detects that the temperature in the battery compartment meets a preset condition, the controller controls the heating wire to heat the heat-sensing component, and the heat-sensing component is broken under the action of the heating wire.

5. The battery pack according to claim 4, characterized in that: The detection assembly also includes a bracket, a fixing block and a pre-tightening screw, one end of the bracket is connected to the spray assembly, and the fixing block is connected to an end of the bracket away from the spray assembly; the pre-tightening screw is threadedly connected to the fixing block, and the distance between the pre-tightening screw and the nozzle can be adjusted by rotation; one end of the heat-sensing component abuts the nozzle, and the other end abuts the pre-tightening screw.

6. The battery pack according to claim 5, characterized in that: The detection component also includes 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 a side of the fixing block away from the bracket.

7. The battery pack according to claim 5, characterized in that: The liquid spraying assembly includes a fixing plate and a nozzle, wherein the fixing plate is connected to the outer wall of the battery box, the nozzle is mounted on the fixing plate, and the nozzle extends into the battery compartment through the fire-fighting hole; and the bracket is connected to the fixing plate.

8. The battery pack according to claim 7, characterized in that: The liquid spraying assembly further comprises a first sealing ring, which is located between the fixing plate and the outer wall of the battery box and surrounds the fire fighting hole.

9. The battery pack according to any one of claims 2 to 8, characterized in that: The heat-sensing component is a heat-sensing glass ball, and the heat-sensing glass ball blocks the nozzle.

10. The battery pack according to claim 9, characterized in that: Protective layers are respectively arranged at both ends of the heat-sensitive glass ball, and the heat-sensitive glass ball is fixed by the protective layers.

11. The battery pack according to claim 9, characterized in that: A positioning portion is provided on one end of the heat-sensitive glass ball facing the nozzle. When the heat-sensitive glass ball blocks the nozzle, the positioning portion is located in the nozzle.

12. The battery pack according to claim 9, characterized in that: A second sealing ring is provided between the heat-sensitive glass ball and the nozzle, and the second sealing ring is configured to seal the gap between the heat-sensitive glass ball and the nozzle.

13. The battery pack according to claim 1, characterized in that: The liquid spraying component is detachably connected to the detection component.

14. The battery pack according to claim 1, characterized in that: The liquid spraying assembly is detachably connected to the battery box.

15. The battery pack according to claim 1, characterized in that: Along the radial direction of the fire-fighting hole, the orthographic projection of the fire-fighting hole on the preset reference plane completely covers the orthographic projection of the detection component on the preset reference plane.

16. The battery pack according to claim 1, characterized in that: The preset condition is that the temperature is greater than or equal to 65°C to 75°C.

17. An energy storage system, characterized in that: A battery pack comprising any one of claims 1 to 16.

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