Battery pack with fire protection and power-off protection functions

Abstract

The utility model discloses a battery pack with fire protection and power-off protection functions. The battery pack comprises a box body assembly welding piece and a module, and the module is assembled in a box body of the box body assembly welding piece; a hot aerosol fire extinguishing device and a fuse assembly are further arranged in the inner space of the box body of the box body installing and welding piece. The hot aerosol fire extinguishing device is located outside the module and fixed to the aerosol support through a fastener, and the aerosol support is fixed to the box body installing and welding piece. The fuse assembly comprises a fuse, and the fuse is connected with a high-voltage plug-in of the battery pack through an adapter bar. According to the novel battery pack, under the condition that the structure and the appearance size of an original battery pack box body are not increased, the hot aerosol fire extinguishing device and the fuse are additionally arranged inside the box body assembly welding piece and outside the battery module, the functions of fire fighting and power-off protection are achieved, the effect of rapid fire extinguishing is achieved, and meanwhile the safety risk caused by too high voltage of a series circuit is reduced.

Description

Technical Field

[0001] The utility model relates to a battery pack, in particular to a battery pack with fire protection and power failure protection functions, belonging to the field of new energy lithium battery storage and charging piles. Background Art

[0002] At present, most battery packs use fuses placed inside the battery pack (on the total positive or negative side), and most fire-fighting devices are installed on the outside of the box. However, once a lithium-ion battery pack catches fire, it will take some time for the relevant firefighters to extinguish the fire through the fire-fighting device. However, since there is a battery box body and a box cover between the battery cell module and the fire-fighting device, the fire-fighting device on the outside of the box plays a relatively small role. On the other hand, after the battery pack catches fire, the electrolyte in the battery cell releases a large amount of flammable gas due to high temperature and high pressure. When the air pressure in the battery pack shell has a large pressure difference with the outside, the air pressure in the battery pack shell will expand rapidly, causing the shell to explode and release pressure. However, due to the uncertainty of the explosion time and location, it is very likely to cause harm to the relevant personnel.

[0003] In view of the above situation, some battery packs currently extinguish fires by adding liquid cooling pipes inside the box. However, adding liquid cooling pipes inside the box requires laying a related cooling circuit at the bottom of the box, which has the disadvantage of high cost. Utility Model Content

[0004] In order to solve the deficiencies existing in the above-mentioned technologies, the utility model provides a battery pack with fire protection and power-off protection functions.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: a battery pack with fire protection and power-off protection functions, including a box body assembly weldment and a module, wherein the module is assembled in the box body of the box body assembly weldment;

[0006] A hot aerosol fire extinguishing device and a fuse assembly are also arranged in the inner space of the box body of the box body assembly weldment;

[0007] The hot aerosol fire extinguishing device is located outside the module and is fixed to the aerosol bracket by fasteners, and the aerosol bracket is fixed to the box assembly weldment;

[0008] The fuse assembly includes a fuse, and the fuse is connected to the high-voltage plug-in of the battery pack through an adapter bar.

[0009] Preferably, the hot aerosol fire extinguishing device is provided with a thermally sensitive wire, which is bonded to the cover plate of the module by a cloth-based tape.

[0010] Preferably, the aerosol support is located at one side of the BMS assembly, and the BMS assembly includes a BMS support and a BMS device fixed to the BMS support by a fastener.

[0011] Preferably, the fuse assembly further comprises a fuse cover and a fuse base, the fuse is integrated in a mounting slot of the fuse base, and the fuse cover is covered on the fuse base by snapping.

[0012] Preferably, a fuse base bracket is fixed by the box assembly welding piece, the fuse base bracket is located at a top angle position outside the module, and the fuse assembly is fixed on the fuse base bracket.

[0013] Preferably, the high-voltage plug-in includes a total positive plug-in and a total negative plug-in, the total positive plug-in is correspondingly connected to a total positive connection row, the total negative plug-in is correspondingly connected to a total negative connection row; the module is correspondingly connected to a module connection row and a U-shaped row;

[0014] The modules, high-voltage plug-ins and fuses are connected in series through the U-shaped bar, the module connection bar, the total negative connection bar, the total positive connection bar and the transfer bar.

[0015] Preferably, the module is confined within the box assembly weldment by a module fixing member.

[0016] Preferably, a box bottom pad is provided at the bottom of the box body assembly weldment, and an insulating plate is provided below the box body assembly weldment;

[0017] A sealing ring is arranged on the top edge of the box body assembly weldment, and a box cover is assembled above the box body assembly weldment.

[0018] Preferably, an explosion-proof valve is installed on one side of the box body weldment.

[0019] Preferably, a crossbeam adapted to be connected to the module fixing piece is provided in the box assembly weldment.

[0020] The utility model discloses a battery pack with fire protection and power-off protection functions. Without increasing the original battery pack box structure and external volume, a hot aerosol fire extinguishing device and a fuse are added inside the box assembly weldment and outside the battery module. Among them, the hot aerosol fire extinguishing device can quickly extinguish the fire. When a fire occurs in the battery pack, the fire extinguishing device triggers the aerosol generator in the fire extinguishing device through a thermistor, thereby generating a chemical reaction to achieve the effect of rapid fire extinguishing. At the same time, for the short circuit problem in the battery pack, the fuse set between the high-voltage plug-in and the module series row can protect the relevant components outside the battery pack, thereby reducing the safety risk caused by the excessive voltage of the series circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1It is an exploded diagram of the composition structure of the battery pack of the utility model.

[0022] Figure 2 This is a schematic structural diagram of the hot aerosol fire extinguishing device used in the utility model.

[0023] Figure 3 It is a structural schematic diagram of the fuse base of the utility model.

[0024] Figure 4 It is a structural schematic diagram of the fuse upper cover of the utility model.

[0025] In the figure: 1. Box body welding parts; 2. Module; 3. Box cover; 4. Sealing ring; 5. Module fixing assembly; 51. Pull rod; 52. Pressure strip; 53. Bushing; 6. Explosion-proof valve; 7. Main positive connection bar; 8. Fuse cover; 9. Fuse base; 10. Adapter bar; 11. Heating plug-in; 12. Main positive plug-in; 13. BMS bracket; 14. BMS device; 15. Fuse base bracket; 16. Hot aerosol fire extinguishing device; 17. Aerosol bracket; 18. Insulating board; 19. Main negative plug-in; 20. Main negative connection bar; 21. Module connection bar; 22. U-shaped bar; 23. Box bottom pad; 24. Crossbeam; 25. Communication plug-in. DETAILED DESCRIPTION

[0026] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0027] In order to solve the problem that it is too late to extinguish the battery pack or disconnect other circuits outside the battery pack in a short period of time when a fire or short circuit occurs in the battery pack, the utility model designs a battery pack with both fire protection and short circuit protection functions, such as Figure 1 As shown in FIG. 1 , it is an exploded view of the structure of the battery pack designed by the present invention. As can be seen from the figure, the battery pack includes a box assembly weldment 1, which is composed of a box part, a circle of box bottom pads 23 at the bottom of the box, a crossbeam 24 inside the box, and a lifting ear on the side of the box.

[0028] The module 2 is assembled inside the box of the box assembly weldment 1. The module 2 contacts the insulating plate 18 at the bottom. The module 2 is confined in the box assembly weldment 1 by the crossbeam 24 and the module fixing member 5. At the same time, a hot aerosol fire extinguishing device 16 and a fuse assembly are also arranged in the box interior space of the box assembly weldment 1, which respectively realize the fire protection and power-off protection functions.

[0029] The hot aerosol fire extinguishing device 16 is located inside the battery pack and outside the module 2. Once a fire occurs inside the battery pack, the fire extinguishing device can extinguish the fire immediately. The hot aerosol fire extinguishing device 16 is specifically set inside the box assembly weldment 1 through the aerosol bracket 17 structure. The hot aerosol fire extinguishing device 16 is first fixed to the aerosol bracket 17 through fasteners, and then the aerosol bracket 17 is fixed to the box assembly weldment 1. In terms of the choice of position setting, the aerosol bracket 17 is set on one side of the BMS component, such as Figure 1 As shown, the BMS assembly includes a BMS bracket 13 and a BMS device 14 fixed to the BMS bracket 13 by fasteners.

[0030] The hot aerosol fire extinguishing device used is as follows: Figure 2 As shown, it has its own sensing element and leads to a thermistor. When the battery pack is assembled, the thermistor is bonded to the cover plate of module 2 through cloth-based tape. When a fire occurs, the fire extinguishing device can sense the aerosol generator in the fire extinguishing device through an electric start signal, or an open flame ignites the thermistor to trigger the aerosol generator in the fire extinguishing device. As the temperature in the battery pack rises sharply, the heat spreads rapidly. At this time, the aerosol generator absorbs the heat on the surface of the burning object through its own tiny particles, preventing the surface temperature of the burning object from rising, so that it cannot provide enough energy to maintain combustion. At the same time, the tiny particles in the aerosol interact with the surface of the burning object to form a layer of inhibitor, which can prevent the basis of oxygen, fuel and heat, thereby achieving the effect of inhibiting the burning process. An effective fire extinguishing effect is achieved by spraying the aerosol to every corner of the battery pack.

[0031] Among them, the fuse assembly is also located inside the battery pack and outside the module 2. The fuse assembly includes a fuse. In the event of a short circuit in the internal components of the box, the added fuse can disconnect the path between the internal components and the external components of the box, thereby ensuring the safety of other equipment and reducing the loss of the entire product.

[0032] As a preferred embodiment, the fuse assembly further includes a fuse cover 8 and a fuse base 9 for realizing the setting of the fuse. The structure of the fuse cover 8 is as follows: Figure 4 As shown, the structure of the fuse base 9 is as follows Figure 3 During assembly, the fuse is first integrated into the installation slot of the fuse base 9, and then the fuse base 9 is fixed to the fuse base bracket 15, and then the fuse is connected to the high-voltage plug-in of the battery pack through the adapter bar 10 (close to the fuse side). After installation and fixation, the fuse cover 8 can be covered on the fuse base 9 by snapping, and the buckle structure can be used for matching assembly, thereby completing the installation of the fuse assembly.

[0033] As for the fuse base bracket 15, it is fixed on the box wall of the box body assembly 1, and the fuse base bracket 15 is located at a top corner position outside the module 2, so as to realize the layout of the fuse assembly inside the battery pack and outside the module 2.

[0034] The fuse is connected in series between the high-voltage plug-in and the module series row. When an abnormal short circuit occurs, it can cut off the path to the external devices of the battery pack, thereby protecting the relevant components outside the battery pack and reducing the safety risks caused by excessive voltage in the series circuit. Figure 1 As shown, the high-voltage devices provided include a total positive plug-in 12 and a total negative plug-in 19. The total positive plug-in 12 is correspondingly connected to a total positive connection bar 7, and the total negative plug-in 19 is correspondingly connected to a total negative connection bar 20; at the same time, the module 2 is correspondingly connected to a module connection bar 21 and a U-shaped bar 22. Through the U-shaped bar 22, the module connection bar 21, the total negative connection bar 20, the total positive connection bar 7 and the adapter bar 10, the module 2, the high-voltage plug-in and the fuse are connected in series.

[0035] In addition, the battery pack disclosed in the present invention is also provided with components such as a communication plug-in 25 and a heating plug-in 11, and an explosion-proof valve 6 for explosion-proof is installed on one side of the box assembly weldment 1.

[0036] In summary, for the battery pack with fire protection and power-off protection functions disclosed in the utility model, the assembly process is as follows: before the overall assembly, the box body assembly welding 1 has been pre-welded; first, the insulating plate 18 is placed at the bottom of the box body assembly welding 1, and the explosion-proof valve 6 is installed in the side end mounting hole of the box body assembly welding 1; secondly, the total positive plug-in 12, the heating plug-in 11, the total negative plug-in 19, the communication plug-in 25, the BMS assembly and the aerosol fire extinguishing device assembly (the aerosol fire extinguishing device 16 is assembled on the aerosol bracket 17 to form an aerosol fire extinguishing device assembly) are fixedly connected to the corresponding positions of the box body welding assembly 1;

[0037] Then, the battery module is installed. The module 2 has been pre-assembled through the module connection row 21 and connected to the U-shaped row 22. The module is assembled and fixed by using the module fixing member 5 and the crossbeam in the box welding assembly 1. The module fixing member 5 includes a tie rod 51, a pressure strip 52 and a sleeve 53. The module is placed in the box welding assembly 1 and on the upper part of the insulating plate 18 by using the corresponding lifting tools, and the module is fixed by the tie rod, pressure strip and sleeve.

[0038] After the module is fixed, the fuse assembly is fixed by using the fuse base bracket 15, and then the series connection between the module, the high-voltage plug-in and the fuse is completed through the U-shaped bar 22, the module connection bar 21, the total negative connection bar 20, the total positive connection bar 7 and the adapter bar 10; the assembly of the box assembly is completed by installing the above components;

[0039] The edge of the box assembly weldment 1 to which the box assembly belongs is provided with a corresponding sealing ring 4, and the box cover assembly weldment 3 can complete the fixed sealing of the box assembly weldment 1 through the box sealing screws, thereby completing the sealing protection of the box assembly.

[0040] The above steps can complete the assembly of the PACK battery pack. The battery pack box maintains the original battery pack components and adds a hot aerosol fire extinguishing device and fuse components. The battery pack can have both fire protection and power-off protection functions without increasing the original space size and volume of the box. Compared with the existing technology, it has the following technical advantages:

[0041] 1) Improvements are made on the basis of existing battery packs, which not only have the basic functions of the original battery packs (charging, discharging, pressure relief, etc.), but also greatly improve the fire safety protection level of the battery packs;

[0042] 2) Compared with other existing liquid-cooled fire-fighting battery packs, the hot aerosol fire-extinguishing device has a convenient structure, easy installation and storage, etc., which reduces production costs and can be used for mass industrial production;

[0043] 3) The hot aerosol fire extinguishing device 16 is located inside the battery pack and outside the module 2, which can extinguish the fire more quickly and effectively;

[0044] 4) When an abnormal situation occurs in the battery pack, such as the electrolyte leakage of the battery cell due to external factors (long use time, impact of foreign objects, etc.), which leads to a short circuit in the battery pack, the fuse can disconnect the path to the external parts of the box, and if a short circuit fire occurs, the hot aerosol fire extinguishing device receives an electric start signal or an open flame ignites the thermistor wire, which can activate the aerosol generator in the fire extinguishing device to achieve fire extinguishing. With the joint action of the two, the safety protection level of the battery pack can be greatly improved.

[0045] The above implementation modes are not limitations of the present invention, and the present invention is not limited to the above examples. Any changes, modifications, additions or substitutions made by technicians in this technical field within the technical solution of the present invention also belong to the protection scope of the present invention.

Claims

1. A battery pack with fire protection and power failure protection functions, comprising a box assembly weldment (1) and a module (2), characterized in that: The module (2) is assembled in the box body of the box body assembly weldment (1); A hot aerosol fire extinguishing device (16) and a fuse assembly are also arranged in the internal space of the box body of the box body assembly weldment (1); The hot aerosol fire extinguishing device (16) is located outside the module (2) and is fixed to an aerosol bracket (17) via a fastener, and the aerosol bracket (17) is fixed to the box assembly weldment (1); The fuse assembly comprises a fuse, and the fuse is connected to the high-voltage plug-in of the battery pack via an adapter bar (10).

2. The battery pack with fire protection and power failure protection functions according to claim 1, characterized in that: The hot aerosol fire extinguishing device (16) is provided with a heat-sensitive wire, which is bonded to the cover plate of the module (2) by means of a cloth-based adhesive tape.

3. The battery pack with fire protection and power failure protection functions according to claim 2, characterized in that: The aerosol support (17) is located on one side of a BMS component, and the BMS component comprises a BMS support (13) and a BMS device (14) fixed to the BMS support (13) by a fastener.

4. The battery pack with fire protection and power failure protection functions according to claim 1, characterized in that: The fuse assembly also includes a fuse cover (8) and a fuse base (9); the fuse is integrated in a mounting groove of the fuse base (9); and the fuse cover (8) is covered on the fuse base (9) by snapping.

5. The battery pack with fire protection and power failure protection functions according to claim 4, characterized in that: A fuse base bracket (15) is fixed via the box body assembly weldment (1), the fuse base bracket (15) is located at a top angle position outside the module (2), and the fuse assembly is fixed on the fuse base bracket (15).

6. The battery pack with fire protection and power failure protection functions according to claim 2 or 4, characterized in that: The high-voltage plug-in comprises a total positive plug-in (12) and a total negative plug-in (19); the total positive plug-in (12) is correspondingly connected to a total positive connection bar (7), and the total negative plug-in (19) is correspondingly connected to a total negative connection bar (20); the module (2) is correspondingly connected to a module connection bar (21) and a U-shaped bar (22); The module (2), the high-voltage plug-in and the fuse are connected in series via the U-shaped bar (22), the module connection bar (21), the total negative connection bar (20), the total positive connection bar (7) and the adapter bar (10).

7. The battery pack with fire protection and power failure protection functions according to claim 6, characterized in that: The module (2) is confined within the box assembly weldment (1) by means of a module fixing member (5).

8. The battery pack with fire protection and power failure protection functions according to claim 7, characterized in that: A box bottom pad (23) is provided at the bottom of the box body assembly weldment (1), and an insulating plate (18) is provided below the box body assembly weldment (1); A sealing ring (4) is provided on the top edge of the box body assembly weldment (1), and a box cover (3) is assembled above the box body assembly weldment (1).

9. The battery pack with fire protection and power failure protection functions according to claim 8, characterized in that: An explosion-proof valve (6) is installed on one side of the box body assembly weldment (1).

10. The battery pack with fire protection and power failure protection functions according to claim 8, characterized in that: A crossbeam (24) adapted to be connected to the module fixing member (5) is arranged in the box assembly weldment (1).

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