Battery pack

Abstract

The utility model provides a battery pack. The battery pack specifically comprises a battery box; the battery module is arranged in the battery box; and the fire extinguishing assembly comprises a spraying part and a fire detection part, the spraying part and the fire detection part are both installed on the end face of the battery box, the fire detection part is used for detecting whether the battery box is in a fire state or not, and the spraying part is used for performing fire extinguishing on the battery module by spraying a preset fire extinguishing substance when the fire detection part detects the fire state. According to the embodiment of the invention, the fire detection part and the spraying part are arranged on the end surface of the battery box, so that the battery module in the battery box can be detected in real time through the fire detection part; the battery module can be actively extinguished in time through the preset fire extinguishing substance sprayed by the spraying part, so that the spreading of thermal runaway of the battery module is effectively prevented, and the occurrence of safety incidents is prevented.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack. Background Art

[0002] With the rapid development of battery technology, the application areas of power batteries have also expanded. For example, power batteries are used in rail transit systems. Power batteries can be used as locomotive traction power and become an important component of the rail transit system. The rail transit system has higher requirements for the safety and stability of power batteries. However, with long-term use, the battery cells in the power battery will show a certain degree of bulging.

[0003] In the related technology, since the current power batteries are mainly explosion-proofed by explosion-proof devices in the battery pack, such as pressure relief chambers and explosion-proof valves, when thermal runaway occurs in the power batteries in the rail transit system, if it cannot be controlled in time, it is easy to cause a safety incident.

[0004] Therefore, how to optimize the battery pack structure, improve the stability and safety of the battery pack, and prevent the spread of thermal runaway is a technical problem that urgently needs to be solved in the current field of battery technology. Utility Model Content

[0005] The embodiments of the present application provide a battery pack that can optimize the battery pack structure, improve the stability and safety of the battery pack, and prevent the technical problem of the spread of thermal runaway.

[0006] An embodiment of the present application provides a battery pack, comprising:

[0007] Battery box;

[0008] A battery module is arranged in the battery box;

[0009] A fire extinguishing component, the fire extinguishing component includes a spray part and a fire detection part, both of which are installed on the end surface of the battery box, the fire detection part is used to detect whether the battery box is in a fire state, and the spray part is used to extinguish the battery module by spraying a preset fire extinguishing substance when the fire detection part detects a fire state.

[0010] In one embodiment, a fixing base is further included, and the fixing base is arranged on the battery box.

[0011] In one embodiment, lifting holes are provided on both sides of the fixing base, and a connecting hole is provided on the bottom of the fixing base.

[0012] In one embodiment, a handle is further included, and the handle is arranged on the end surface of the battery box along the extension direction of the lifting hole.

[0013] In one embodiment, at least two insulating layers are provided on the outer surface and / or inner surface of the battery box.

[0014] In one embodiment, the two insulating layers include an electrophoretic layer and a powder coating layer.

[0015] In one embodiment, the battery pack further includes at least two battery management systems, at least two of which are disposed in the battery box and connected to the battery module, and one of the at least two battery management systems serves as a backup battery management system.

[0016] In one embodiment, the battery pack further includes at least two sets of temperature and pressure sampling lines, which are arranged in the battery box and are respectively connected to the battery module and the battery management system.

[0017] In one embodiment, the thickness of the battery box ranges from 1.8 mm to 5 mm.

[0018] Beneficial effects of the embodiments of the present application:

[0019] In an embodiment of the present application, a battery pack is provided, specifically comprising: a battery box; a battery module, which is arranged in the battery box; and a fire extinguishing component, wherein the fire extinguishing component comprises a spraying part and a fire detecting part, wherein the spraying part and the fire detecting part are both installed on the end surface of the battery box, wherein the fire detecting part is used to detect whether the battery box is in a fire state, and wherein the spraying part is used to extinguish the fire of the battery module by spraying a preset fire extinguishing substance when the fire detecting part detects a fire state. By arranging a fire detecting part for detecting whether the battery box is in a fire state and an spraying part for extinguishing the fire of the battery module by spraying a preset fire extinguishing substance when the fire detecting part detects a fire state on the end surface of the battery box, the battery module in the battery box can be detected in real time by the fire detecting part, and when the fire detecting part detects that the battery module is in a fire state, the preset fire extinguishing substance can be sprayed by the spraying part in time to actively extinguish the fire of the battery module, thereby effectively preventing the spread of thermal runaway of the battery module and preventing the occurrence of safety incidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 is a schematic structural diagram of a battery pack in a closed state provided by an embodiment of the present application;

[0022] Figure 2 is a schematic diagram of an exploded structure of a battery pack provided in an embodiment of the present application;

[0023] Figure 3 It is a schematic diagram of the structure of the box provided in the embodiment of the present application. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise stated, the directional words such as "upper" and "lower" used generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0025] In the related art, since the current power batteries are mainly explosion-proofed by explosion-proof devices in the battery pack, such as pressure relief chambers and explosion-proof valves, when the power batteries in the rail transit system have thermal runaway, if they cannot be timely controlled, it is easy to cause a safety incident. For this reason, the embodiment of the present application provides a battery pack, by providing a fire detection unit on the end face of the battery box for detecting whether the battery box is in a fire state, and a spray unit for extinguishing the fire of the battery module by spraying a preset fire extinguishing substance when the fire detection unit detects a fire state. In this way, the battery module in the battery box can be detected in real time by the fire detection unit. When the fire detection unit detects that the battery module is in a fire state, the preset fire extinguishing substance can be sprayed by the spray unit in time to actively extinguish the fire of the battery module, thereby effectively preventing the spread of thermal runaway of the battery module and preventing the occurrence of safety incidents. For specific solutions, please refer to the following specific description.

[0026] It should be noted that, hereinafter, the terms "battery module", "battery", "battery element", "battery cell" and "battery pack" can be used interchangeably and can refer to any of a variety of different rechargeable battery chemistries and structures, including but not limited to lithium ion (e.g., lithium ion phosphate, lithium cobalt oxide, lithium iron phosphate, other lithium metal oxides, etc.), lithium ion polymer, nickel metal hydride, nickel cadmium, nickel metal hydride, nickel zinc, silver zinc or other battery types / structures. The term "electric vehicle" is used here to refer to a fully electric vehicle, also known as an EV, a plug-in hybrid vehicle, also known as a PHEV, or a hybrid electric vehicle (HEV), wherein the hybrid vehicle uses multiple propulsion sources, one of which is an electric drive system. It should be understood that the same figure numbers are used in multiple figures to refer to the same components or components of equivalent functions, and various modifications to the preferred embodiments, general principles and features described herein will be obvious to those skilled in the art. In addition, the drawings are intended only to illustrate the scope of the present application and not to limit it and should not be considered to be drawn to scale.

[0027] Embodiments of the present application are generally applicable to systems using electric motors, and more specifically, but not exclusively, to electric vehicles using multiphase electric motors (e.g., inductive motors). Electric vehicles use one or more stored energy sources such as battery packs to provide electrical energy to the vehicle. This energy is at least partially used to propel the vehicle. The stored energy can also be used to provide energy required for other vehicle systems, such as vehicle lighting, vehicle partitionable heating, ventilation and air conditioning (HVAC) systems, auxiliary control systems (e.g., sensors, displays, navigation systems, etc.), vehicle entertainment systems (e.g., radio, DVD, MP3, etc.), etc. Conventional electric vehicles include passenger vehicles and vehicles designed to transport goods, examples of which include rail transit vehicles. Electric vehicles can also include other passenger cars, dedicated work vehicles and carts, some of which can be integrated with forklifts, scissor lifts, lifting and / or articulated boom aerial work platforms, street cleaning systems, conveyor belts, and flatbed handling platforms.

[0028] For details, please refer to Figure 1-3 , Figure 1 It is a structural schematic diagram of a battery pack provided in an embodiment of the present application, and the battery pack 10 specifically includes: a battery box 100; a battery module 200, which is arranged in the battery box 100; a fire extinguishing component, and the fire extinguishing component includes a spray part 301 and a fire detection part 302, and the spray part 301 and the fire detection part 302 are both installed on the end surface of the battery box 100, and the fire detection part 302 is used to detect whether the battery box 100 is in a fire state, and the spray part 301 is used to extinguish the battery module 200 by spraying a preset fire extinguishing substance when the fire detection part 302 detects a fire state.

[0029] In the embodiment of the present application, a fire detection unit 302 is provided on the end face of the battery box 100 for detecting whether the battery box 100 is in a fire state, and a spray unit 301 is provided for extinguishing the fire of the battery module 200 by spraying a preset fire extinguishing substance when the fire detection unit 302 detects a fire state. Thus, the battery module 200 in the battery box 100 can be detected in real time by the fire detection unit 302. When the fire detection unit 302 detects that the battery module 200 is in a fire state, the preset fire extinguishing substance can be sprayed by the spray unit 301 in time to actively extinguish the fire of the battery module 200, thereby effectively preventing the spread of thermal runaway of the battery module 200 and preventing the occurrence of safety incidents.

[0030] In the above embodiment, the injection unit 301 and the fire detection unit 302 are both installed on the same end surface of the battery box 100, or they can be different end surfaces, which can be specifically arranged according to actual needs.

[0031] The fire detection unit 302 is specifically used to detect the temperature and CO gas in the battery box 100. When the temperature and / or CO gas are higher than the corresponding preset thresholds, it is confirmed that the battery module 200 in the battery box 100 is in a fire state.

[0032] It can be understood that the battery pack 10 also includes a data processor (not shown in the figure), which can be set independently. When set independently, the data processor is connected to the injection unit 301 and the fire detection unit 302 respectively. The data processor can be used to collect or receive the detection signal generated by the fire detection unit 302, and analyze the detection signal. If it is determined that the battery box 100 is in a fire state, a control signal is sent to the injection unit 301 to control the injection unit 301 to extinguish the battery module 200 by injecting a preset fire extinguishing substance; the data processor set can also be integrated in the fire detection unit 302, then the fire detection unit 302 is connected to the injection unit 301 as a whole, and the fire detection unit 302 is used to collect the detection signal generated by the probe of the fire detection unit 302, and analyze the detection signal. If it is determined that the battery box 100 is in a fire state, a control signal is sent to the injection unit 301 to control the injection unit 301 to extinguish the battery module 200 by injecting a preset fire extinguishing substance. Specifically, whether to integrate the data processor into the fire detection unit 302 can be set according to actual needs. The above-mentioned preset fire extinguishing substances include but are not limited to perfluorohexanone.

[0033] In order to meet the requirements of high reliability, long life and high voltage safety of the rail transit system, in addition to considering the fire prevention in the above embodiments, the present application also considers the waterproof tightness of the battery box 100, the structural strength of the battery box 100, the insulation of the battery box 100 and the redundant design of the battery management system 500. For specific designs, please refer to the following embodiments:

[0034] In order to improve the waterproof and airtightness of the battery box 100, in some embodiments of the present application, Figure 2 As shown, the battery box 100 includes a box body 101, an upper cover 102 and a waterproof foam 103. The box body 101 and the upper cover 102 are fixedly connected. The waterproof foam 103 is arranged between the box body 101 and the upper cover 102. The waterproof foam 103 is used to seal the battery box 100.

[0035] Among them, the waterproof foam 103 is adapted to the openings of the upper cover 102 and the box body 101, and can fill the gap between the two. The waterproof foam 103 needs to be made of a waterproof material, such as chloroprene rubber foam, polyurethane foam, EVA foam or silicone foam. It should be noted that when selecting the material, factors such as waterproof performance, durability, cost and adaptability need to be considered to ensure that the foam can effectively improve the waterproof and airtightness of the battery box 100.

[0036] In a specific embodiment, the box body 101 and the upper cover 102 may be fixedly connected by bolts.

[0037] In order to improve the insulation of the battery box 100, in some embodiments of the present application, the outer surface and / or inner surface of the battery box 100 is provided with at least two insulating layers, and the two insulating layers include an electrophoretic layer and a powder coating layer.

[0038] Among them, the at least two insulating layers can be two layers, three layers, or more than three layers, which can be specifically set according to actual needs.

[0039] In order to further improve its insulation effect, a mixed treatment method of electrophoresis and powder coating can be adopted.

[0040] Specifically, in order to improve the insulation of the surface of the battery box 100 , it is conceivable to use a polypropylene (PP) film, a polyimide (PI) film, a polyolefin (PO) film, and a polyurethane (PU) coating as the insulation layer.

[0041] It should be noted that when selecting the material of the insulating layer, factors such as its insulation performance, durability, cost and adaptability need to be considered, and selection and testing should be performed according to specific application requirements to ensure that the surface insulation of the battery box 100 is improved.

[0042] In order to improve the structural strength of the battery box 100, in some embodiments of the present application, the battery box 100 may adopt a sheet metal structure. The upper cover 102 and / or the box body 101 of the battery box 100 are made of carbon steel. The thickness of the upper cover 102 and / or the box body 101 of the battery box 100 ranges from 1.8 mm to 5 mm.

[0043] In some preferred embodiments of the present application, the upper cover 102 and the box body 101 of the battery box 100 are both made of high-strength carbon steel sheet metal, and the thickness of the upper cover 102 and the box body 101 is 2 mm.

[0044] In order to reduce the probability of thermal runaway of the battery module 200, in some embodiments of the present application, the battery pack 10 also includes a liquid cooling plate 400, which is arranged between the bottom plate of the battery box 100 and the battery module 200, and the liquid cooling plate 400 is used to dissipate heat from the battery module 200.

[0045] Furthermore, the battery pack 10 also includes a thermally conductive adhesive (not shown in the figure), which is arranged between the liquid cooling plate 400 and the battery module 200, and the thermally conductive adhesive is used to conduct heat between the battery module 200 and the liquid cooling plate 400.

[0046] In order to improve the high-voltage resistance of the battery module 200 , in some embodiments of the present application, the material of the end plate (not shown in the figure) of the battery module 200 is an insulating composite material.

[0047] It should be noted that the strength of the composite material is greater than a preset strength threshold, so that the strength of the end plate meets the expected requirements. Specifically, the composite material can be a high-strength glass cloth laminate.

[0048] In order to improve the reliability of the battery management system 500, in some embodiments of the present application, the battery pack 10 also includes at least two sets of battery management systems 500, at least two sets of the battery management systems 500 are arranged in the battery box 100 and connected to the battery module 200, and one of the at least two sets of the battery management systems 500 serves as a backup battery management system.

[0049] Furthermore, the battery module 200 is connected to at least two battery management systems 500 by using corresponding sets of temperature and pressure sampling lines 700. The temperature and pressure sampling lines 700 are arranged in the battery box 100 and are respectively connected to the battery module and the battery management system.

[0050] Furthermore, the battery management system 500 adopts a high-voltage resistant model.

[0051] Among them, from the consideration of reliability and cost, two sets of battery management systems 500 are preferably used as a redundant design.

[0052] In other embodiments of the present application, Figure 3 As shown, in order to ensure the stability of the battery pack 10, the battery pack also includes a fixing seat 105, and the fixing seat 105 is arranged on the battery box 100. Specifically, a plurality of fixing seats 105 can be arranged on the side panels and / or end panels of the box body 101, and the fixing seat 105 is used to fix the battery pack 10 on the vehicle.

[0053] Furthermore, in order to facilitate the transportation and fixation of the battery box, in some embodiments of the present application, lifting holes 107 are provided on both sides of the fixing base, and a connecting hole 108 is provided at the bottom of the fixing base. The lifting holes 107 are used for lifting and transporting the battery pack, and the connecting holes are used to fix the battery pack 10 on the vehicle.

[0054] Furthermore, in order to facilitate subsequent installation and position adjustment, the battery pack also includes a handle 104, and the handle 104 is arranged on the end face of the battery box 100 along the extension direction of the lifting hole 107. The handle 104 can also be arranged on the box body 101, and the handle 104 is fixed on the side panel of the end plate. Preferably, two handles 104 are respectively arranged on two opposite side panels. Specifically, the handle is arranged on the end face of the box body along the extension direction of the lifting hole, and can be specifically welded.

[0055] Furthermore, at least two module cross beams 106 are arranged on the bottom plate of the box body 101 , and the module cross beams 106 are used to support the battery module 200 . The cooling plate can be arranged between two adjacent module cross beams 106 .

[0056] In some embodiments of the present application, the battery pack 10 preferably includes a copper busbar 600 and a cable assembly (not shown in the figure), wherein the copper busbar 600 is used to provide circuit connection, and the cable assembly is used for low-voltage communication.

[0057] Specifically, the battery modules 200 and the modules and the pre-installed connectors are electrically connected via the copper busbar 600 .

[0058] The battery management system 500 is fixed in the box 101, and the battery module 200, the battery management system 500 and the preset external communication are connected through a cable assembly.

[0059] In some embodiments of the present application, a water inlet and outlet connected to a cooling plate may be provided on the end surface of the box 101. Positive and negative electrode channels, channels for communication input and output lines, etc. may be specifically provided according to actual needs and will not be described in detail here.

[0060] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A battery pack, characterized in that: include: Battery box; A battery module is arranged in the battery box; A fire extinguishing component, the fire extinguishing component includes a spraying unit and a fire detecting unit, both of which are installed in the battery box, the fire detecting unit is used to detect whether the battery box is in a fire state, and the spraying unit is used to extinguish the fire of the battery module by spraying a preset fire extinguishing substance when the fire detecting unit detects a fire state; The battery box includes a box body, an upper cover and waterproof foam, the box body and the upper cover are fixedly connected, the waterproof foam is arranged between the box body and the upper cover, and the waterproof foam is used to seal the battery box.

2. The battery pack according to claim 1, characterized in that: It also includes a fixing seat, which is arranged on the battery box.

3. The battery pack according to claim 2, characterized in that: Lifting holes are arranged on both sides of the fixing seat, and a connecting hole is arranged on the bottom of the fixing seat.

4. The battery pack according to claim 3, characterized in that: It also includes a handle, which is arranged on the end surface of the battery box along the extension direction of the lifting hole.

5. The battery pack according to claim 1, characterized in that: The outer surface and / or inner surface of the battery box is provided with at least two insulating layers.

6. The battery pack according to claim 5, characterized in that: The two insulating layers include an electrophoretic layer and a powder coating layer.

7. The battery pack according to any one of claims 1 to 6, characterized in that: The battery pack also includes at least two battery management systems, at least two of which are arranged in the battery box and connected to the battery module, and one of the at least two battery management systems serves as a backup battery management system.

8. The battery pack according to claim 7, characterized in that: The battery pack also includes at least two sets of temperature and pressure sampling lines, which are arranged in the battery box and are respectively connected to the battery module and the battery management system.

9. The battery pack according to any one of claims 1 to 6, characterized in that: The thickness of the battery box ranges from 1.8 mm to 5 mm.

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