Fire extinguishing structure for electric forklift and battery pack

Abstract

The utility model discloses a fire extinguishing structure for an electric forklift and a battery pack, and belongs to the technical field of electric forklifts, a forklift body is provided with a battery bin, a fixing frame body is arranged outside the battery pack, an auxiliary part is arranged on the surface of the fixing frame body, and a limiting part is arranged on the side of the fixing frame body; the auxiliary part abuts against the inner wall of the battery bin. The stability of the battery pack in the battery compartment can be guaranteed through cooperation of the auxiliary part, the limiting part and the fixing frame body, so that friction between the battery pack and the inner wall of the battery compartment due to accidents in the operation process of the electric forklift can be avoided, abnormal change of the surrounding temperature of the battery pack is avoided, and the fire extinguishing and explosion preventing effects are guaranteed.

Description

Technical Field

[0001] The utility model belongs to the field of electric forklifts, and in particular relates to a fire extinguishing structure and a battery pack for an electric forklift. Background Art

[0002] An electric forklift is a forklift that uses electricity to operate. It uses batteries as the power source to drive the travel motor and the hydraulic system motor to achieve travel and loading and unloading operations. The durability, reliability and applicability of electric forklifts have been significantly improved, and they can fully compete with internal combustion engine forklifts.

[0003] However, if a malfunction and fire occurs during the operation of the battery, it will cause greater damage to the forklift if not handled in time. The existing battery pack shell structure used in electric forklifts lacks an automatic fire extinguishing function, making it difficult to extinguish the battery as soon as the battery catches fire.

[0004] The invention application with publication number WO2022012450A1 relates to a fire-proof battery pack and vehicle, including: a protective box body, in which a plurality of accommodating cavities for installing battery modules are provided, and the protective box body is surrounded by a box wall, and a hollow structure for filling a fire extinguishing agent with a preset pressure value is formed in the box wall; an ejection part, which is distributed on one side of the box wall facing each accommodating cavity and is connected to the hollow structure, and the interior of the ejection part is filled with a thermosensitive material for preventing the fire extinguishing agent in the hollow structure from being ejected, and the thermosensitive material can deform when the temperature rises to a preset deformation temperature threshold range so that the fire extinguishing agent can be ejected into the accommodating cavity through the ejection part.

[0005] The invention application with publication number EP4383408A1 discloses a battery pack configured to ensure safety even when a thermal event occurs. The battery pack includes: a battery module having at least one battery cell; a control module connected to the battery module and configured to manage the battery module; and a fire extinguishing tank containing a fire extinguishing agent, connected to the battery module. At least one of the battery module and the control module has a blocking member, and the outer surface of the blocking member at least partially extends downward.

[0006] The above-mentioned battery pack has poor structural stability during use, is easy to wear, and the fire extinguishing effect needs to be further improved. Utility Model Content

[0007] The utility model aims to provide a fire extinguishing structure and a battery pack for an electric forklift, which can ensure the structural stability of the battery pack and improve the fire extinguishing and explosion-proof effects.

[0008] The technical solution adopted by the utility model to achieve the above-mentioned purpose is:

[0009] A battery pack for an electric forklift, wherein the forklift body is provided with a battery compartment, the exterior of the battery pack is provided with a fixed frame, the surface of the fixed frame is provided with an auxiliary component, and the side of the fixed frame is provided with a limiting component; the auxiliary component and the limiting component are both in contact with the inner wall of the battery compartment.

[0010] By adopting the above technical solution, the cooperation of auxiliary parts, limit parts and fixed frame can ensure the stability of the battery pack inside the battery compartment. In this way, the battery pack can be prevented from accidentally rubbing against the inner wall of the battery compartment during the operation of the electric forklift, and abnormal changes in the temperature around the battery pack can be avoided.

[0011] Furthermore, the limiting member elastically abuts against the inner wall of the battery compartment.

[0012] According to an embodiment of the utility model, the auxiliary component includes a support frame, the support frame is configured with a first container and a second container with a hollow interior, the end surface of the first container is higher than the end surface of the second container, and the first container is made of a flexible material, such as rubber, silicone, etc. In this way, the auxiliary component can achieve elastic contact with the inner wall of the battery compartment.

[0013] The support frame comprises supporting frames arranged opposite to each other, the two supporting frames are connected and fixed by bolts, connecting rods and other components, and the first container and the second container are arranged side by side between the two supporting frames.

[0014] According to one embodiment of the present invention, the first container is a closed structure, and the second container is a cylindrical structure with openings at both ends.

[0015] The first container is filled with liquid fire extinguishing material, and two second containers are symmetrically arranged on both sides of the first container, and are filled with solid fire extinguishing material. In this way, a fire extinguishing structure is formed on the upper and lower sides of the battery pack, and different forms of fire extinguishing materials can be used to quickly extinguish the fire and avoid thermal runaway inside the battery compartment.

[0016] According to one embodiment of the utility model, the limiting member includes a limiting substrate, and a plurality of limiting substrates are arranged in an array along the outer edge of the battery pack; a mounting arc surface adapted to the fixed frame is provided on the side of the limiting substrate facing the fixed frame, and a contact arc surface is provided on the side of the limiting substrate facing away from the fixed frame.

[0017] The limiting substrate is fixedly connected to the side of the battery pack by fasteners such as bolts. Accordingly, the limiting substrate is provided with mounting holes for matching the connection of the fasteners.

[0018] When the battery pack is placed inside the battery compartment, the limit piece abuts against the inner wall of the battery compartment. The setting of the abutting arc surface can prevent the limit substrate from completely fitting against the inner wall of the battery compartment. This helps the air flow to flow on the surface of the limit substrate, which helps to promote heat exchange around the battery pack, thereby preventing local temperature from being too high and avoiding thermal runaway.

[0019] According to an embodiment of the utility model, the surface of the limiting substrate is provided with a through groove, which can not only reduce the deadweight of the limiting substrate and avoid overloading of the electric forklift, but also ensure airflow and heat exchange between the inside and outside of the limiting substrate.

[0020] The utility model also provides a fire extinguishing structure for an electric forklift, comprising a filling piece, the filling piece is arranged between a limiting base plate and a fixed frame, the filling piece comprises a tank body, and the tank body has a cavity for accommodating a fire extinguishing material.

[0021] In this way, a fire extinguishing structure is formed around the fixed frame of the battery pack. When the battery pack temperature rises and spontaneously ignites due to an accident, the filling member close to the fixed frame can play a fire extinguishing function, extinguish the flame in a short time, reduce the temperature of the battery pack, and avoid explosion.

[0022] According to an embodiment of the utility model, a plate body with a continuous bending portion is arranged on the side of the tank body, and both ends of the plate body are connected to the tank body.

[0023] The plates can be symmetrically arranged on both sides of the tank body.

[0024] In addition, structures such as fire extinguishing stickers can be provided on the outer surface of the plate body to form a new fire extinguishing structure on the side of the tank body.

[0025] Because the plate body has a continuous bending portion, the plate body forms a closed or semi-closed, irregular annular structure on the side of the can body. This irregular annular structure has a larger surface area. When the battery pack explodes due to an accident, the annular structure formed by the plate body can be used to adhere to the particulate matter released from the battery pack, and the airflow can flow outward through the annular structure and the through grooves on the limiting substrate, thereby achieving separation of the combustible material and the airflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the assembly structure of a fire extinguishing structure and a battery pack for an electric forklift according to one embodiment of the utility model;

[0027] Figure 2 for Figure 1 A schematic diagram of the structure of the battery pack shown;

[0028] Figure 3 for Figure 2 The structural schematic diagram of the limiter shown;

[0029] Figure 4 for Figure 2 A schematic diagram of the structure of the filling member shown;

[0030] Figure 5 for Figure 2 A schematic diagram of the assembly of the battery pack and auxiliary components;

[0031] Figure 6 for Figure 5 Schematic diagram of the structure of the auxiliary parts shown.

[0032] Reference numerals: forklift body 10; battery compartment 11; box door 12; battery pack 13; fixed frame 14; auxiliary part 20; support frame 21; first container 22; second container 23; limiting part 30; limiting substrate 31; mounting arc surface 32; abutting arc surface 33; mounting hole 34; through groove 35; filling part 40; tank body 41; plate body 42. DETAILED DESCRIPTION

[0033] The technical solution of the utility model is further described in detail below in combination with the specific implementation mode and the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0034] Example 1

[0035] Figure 1 to Figure 6 The fire extinguishing structure and battery pack 13 for an electric forklift according to an embodiment of the utility model are schematically shown. As shown in the figure, the electric forklift includes a forklift body 10, on which a battery compartment 11 is provided, and a box door 12 is arranged at the open end of the battery compartment 11, and the interior of the battery compartment 11 is used to place the battery pack 13. The battery pack 13 of this embodiment is provided with a fixed frame 14 on the outside, and an auxiliary part 20 is arranged on the surface of the fixed frame 14, and a limiting part 30 is arranged on the side of the fixed frame 14; the auxiliary part 20 and the limiting part 30 are both in contact with the inner wall of the battery compartment 11. Specifically, the auxiliary part 20 can be arranged on the upper and lower sides of the fixed frame 14, for contacting with the upper top and lower bottom of the battery compartment 11; the limiting part 30 can be arranged on the left and right sides of the fixed frame 14, for contacting with the left and right sides of the battery compartment 11. In this way, the cooperation between the auxiliary component 20, the limiting component 30 and the fixed frame 14 can ensure the stability of the battery pack 13 inside the battery compartment 11. In this way, the battery pack 13 can be prevented from accidentally rubbing against the inner wall of the battery compartment 11 during the operation of the electric forklift, thereby avoiding abnormal changes in the temperature around the battery pack 13.

[0036] Furthermore, the limiting member 30 elastically abuts against the inner wall of the battery compartment 11 .

[0037] The auxiliary component 20 includes a support frame 21, and the support frame 21 is fixedly connected to the upper surface or the lower surface of the fixed frame body 14. The support frame 21 is configured with a first container 22 and a second container 23 with a hollow interior. The end surface of the first container 22 is higher than the end surface of the second container 23. The first container 22 is made of a flexible material, such as rubber, silicone, etc. In this way, the auxiliary component 20 can achieve elastic contact with the inner wall of the battery compartment 11.

[0038] The support frame 21 includes supporting frames arranged opposite to each other. The two supporting frames are connected and fixed by bolts, connecting rods and other components. The first container 22 and the second container 23 are arranged side by side between the two supporting frames.

[0039] As required, the first container 22 is a cylindrical closed structure, and the second container 23 is a square cylindrical structure with openings at both ends.

[0040] The first container 22 is filled with liquid fire extinguishing material, and the two second containers 23 are symmetrically arranged on both sides of the first container 22, and are filled with solid fire extinguishing material, such as fire extinguishing stickers, etc. In this way, a fire extinguishing structure is formed on the upper and lower sides of the battery pack 13, and different forms of fire extinguishing materials can be used to quickly extinguish the fire and avoid thermal runaway inside the battery compartment 11.

[0041] In addition, the elastic first container 22 contains liquid fire extinguishing material, which enables it to deform under external squeezing, thereby achieving a buffering effect on external impact; that is, if an accident occurs during the operation of the electric forklift, causing the battery pack 13 and its peripheral fixed frame 14 to be misplaced or offset, the setting of the first container 22 can avoid direct contact between the battery pack 13 and the inner wall of the battery compartment 11, thereby preventing wear on the surface of the battery pack 13 and improving safety in use.

[0042] The fire extinguishing materials arranged in the first container 22 and the second container 23 include but are not limited to the following sources: materials disclosed in the invention patent with publication number CN114736554A entitled an environmentally friendly fire retardant coating and its preparation method, materials disclosed in the invention patent with publication number CN114748830A entitled a perfluorohexanone microcapsule fire extinguishing material and its preparation method, etc.

[0043] The limiting member 30 includes a limiting substrate 31, and a plurality of limiting substrates 31 are arranged in an array along the outer edge of the battery pack 13; in this way, the force balance of the fixing frame 14 can be ensured, and the battery pack 13 can be prevented from being squeezed due to deformation of the fixing frame 14, thereby avoiding deformation of the battery pack 13.

[0044] A mounting arc surface 32 adapted to the fixing frame 14 is disposed on a side of the limiting substrate 31 facing the fixing frame 14 , and an abutting arc surface 33 is disposed on a side of the limiting substrate 31 facing away from the fixing frame 14 .

[0045] The limiting substrate 31 is fixedly connected to the side of the battery pack 13 by fasteners such as bolts. Accordingly, the limiting substrate 31 is provided with mounting holes 34 for matching the connection of the fasteners.

[0046] The limiting substrate 31 is used to limit and protect the fixed frame 14, which can avoid direct contact between the fixed frame 14 and the battery pack 13 therein and the inner wall of the battery compartment 11, thereby reducing the generation of friction heat and the possibility of damage or combustion of the battery pack 13.

[0047] When the battery pack 13 is placed inside the battery compartment 11, the limiting member 30 abuts against the inner wall of the battery compartment 11. The setting of the abutting arc surface 33 can prevent the limiting substrate 31 from completely fitting against the inner wall of the battery compartment 11, which helps the air flow to flow on the surface of the limiting substrate 31, and helps to promote heat exchange around the battery pack 13, thereby preventing the local temperature from being too high and avoiding thermal runaway.

[0048] The surface of the limiting substrate 31 is provided with a through groove 35. The provision of the through groove 35 can not only reduce the deadweight of the limiting substrate 31 and prevent the electric forklift from being overloaded, but also ensure the airflow and heat exchange inside and outside the limiting substrate 31. In particular, when an explosion occurs inside the battery compartment 11, the granular combustibles entrained in the airflow can adhere to the surface of the through groove 35, that is, the provision of the through groove 35 increases the contact area between the limiting substrate 31 and the airflow, which helps to separate the airflow from the combustibles and avoid further combustion or secondary explosion.

[0049] In this embodiment, the fire extinguishing patch is used in conjunction with a liquid fire extinguishing agent, which can fully exert the fire extinguishing effect inside the relatively closed battery compartment 11, quickly extinguish the flame, effectively prevent the flame from spreading, and reduce the probability of battery explosion.

[0050] A fire extinguishing structure is provided between the limiting substrate 31 and the fixed frame 14, including a filling member 40, which can be matched with the curved surface of the case on the limiting substrate 31. The filling member 40 is provided between the limiting substrate 31 and the fixed frame 14, and the filling member 40 includes a tank body 41, and the tank body 41 has a cavity for accommodating fire extinguishing materials.

[0051] In this way, a fire extinguishing structure is formed on the periphery of the fixed frame 14 of the battery pack 13. When the battery pack 13 is heated up and spontaneously ignites due to an accident, the filling member 40 closely attached to the periphery of the fixed frame 14 can play a fire extinguishing function, extinguish the flame in a short time, reduce the temperature of the battery pack 13, and avoid explosion.

[0052] A plate body 42 having a continuous bending portion is disposed on the side of the can body 41 , and both ends of the plate body 42 are connected to the can body 41 .

[0053] The plate body 42 may be symmetrically arranged on both sides of the tank body 41 .

[0054] Furthermore, a fire extinguishing sticker or other structure may be provided on the outer surface of the plate body 42 to form a new fire extinguishing structure on the side of the tank body 41 .

[0055] Because the plate body 42 has a continuous bending portion, the plate body 42 forms a closed or semi-closed, irregular annular structure on the side of the tank body 41. This irregular annular structure has a larger surface area. When the battery pack 13 explodes due to an accident, the annular structure formed by the plate body 42 can be used to adhere to the particulate matter released from the inside of the battery pack 13, and the airflow can flow outward through the annular structure and the through groove 35 on the limiting substrate 31, thereby achieving the separation of the combustible material and the airflow.

[0056] In addition, the plates 42 are arranged on both sides of the tank body 41, which can improve the stability of the tank body 41 itself and enhance the stability of its connection with the limiting substrate 31. When the battery pack 13 spontaneously ignites or even explodes, the temperature inside the battery compartment 11 rises, and the matching structure of the fixed frame 14 and the auxiliary parts 20 and the limiting parts 30 will change due to the influence of temperature and airflow. In this process, the plate 42 can resist part of the airflow impact and fit with the limiting substrate 31 under the impact of airflow, thereby reducing the displacement of the tank body 41 in this process, so that the liquid fire extinguishing material inside the tank body 41 can be more evenly dispersed inside the battery compartment 11 during the impact with the external structure, thereby improving the fire extinguishing effect.

[0057] The fire extinguishing structure and the battery pack 13 provided in this embodiment can be used not only for electric forklifts, but also for electric vehicles, electric cranes, electric scooters and other vehicles that are powered by batteries and driven.

[0058] The conventional operations in the operating steps of the present invention are well known to those skilled in the art and will not be described in detail here.

[0059] The embodiments described above provide a detailed description of the technical solution of the utility model. It should be understood that the above is only a specific embodiment of the utility model and is not intended to limit the utility model. Any modifications, supplements or similar substitutions made within the scope of the principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A battery pack (13) for an electric forklift, wherein a forklift body (10) is provided with a battery compartment (11), characterized in that: The battery pack (13) is provided with a fixed frame (14) on its exterior, an auxiliary component (20) is provided on the surface of the fixed frame (14), and a limiting component (30) is provided on the side of the fixed frame (14); the auxiliary component (20) is in contact with the inner wall of the battery compartment (11).

2. The battery pack (13) for an electric forklift according to claim 1, characterized in that: The auxiliary component (20) comprises a support frame (21), wherein the support frame (21) is provided with a first container (22) and a second container (23) which are hollow inside, wherein the end surface of the first container (22) is higher than the end surface of the second container (23), and the first container (22) is made of a flexible material.

3. The battery pack (13) for an electric forklift according to claim 2, characterized in that: The first container (22) is a sealed structure, and the second container (23) is a cylindrical structure with openings at both ends.

4. The battery pack (13) for an electric forklift according to claim 1, characterized in that: The limiting member (30) comprises a limiting substrate (31), and a plurality of the limiting substrates (31) are arranged in an array along the outer edge of the battery pack (13); A mounting arc surface (32) is provided on a side of the limiting substrate (31) facing the fixed frame (14), and an abutting arc surface (33) is provided on a side of the limiting substrate (31) facing away from the fixed frame (14).

5. The battery pack (13) for an electric forklift according to claim 4, characterized in that: A through groove (35) is arranged on the surface of the limiting substrate (31).

6. A fire extinguishing structure for an electric forklift, matched with the battery pack (13) according to claim 4 or 5, characterized in that: It comprises a filling piece (40), the filling piece (40) being arranged between the limiting base plate (31) and the fixing frame (14), the filling piece (40) comprising a tank body (41), the tank body (41) having a cavity for accommodating a fire extinguishing material.

7. The fire extinguishing structure for an electric forklift according to claim 6, characterized in that: A plate body (42) having a continuous bending portion is arranged on the side of the tank body (41), and both ends of the plate body (42) are connected to the tank body (41).

Images