Fireproof battery pack for hybrid electric vehicle

Abstract

The utility model discloses a fireproof battery pack for a hybrid electric vehicle, and relates to the technical field of battery packs. The fireproof battery cell for the hybrid electric vehicle comprises a box body, a U-shaped beam is arranged in the center of the box body, a plurality of battery cells are arranged on the left side and the right side of the U-shaped beam side by side, a cooling plate body is arranged below the battery cells, the cooling plate body comprises at least two first plate bodies, a plurality of U-shaped pipes are arranged between the first plate bodies, and the U-shaped pipes are arranged in the box body. A movable base body is arranged between the U-shaped pipes. The fire extinguishing paste is pasted on the surface of the U-shaped beam, so that the functions of thermal runaway suppression, active cooling and active fire extinguishing are achieved. And meanwhile, a cooling plate body structure is additionally arranged at the bottom of the battery cell to dissipate heat of the battery cell. And the battery cell is fixed in a specific position by arranging the groove and the separation strip, so that fire catching caused by collision, extrusion and deformation of the battery cell is avoided. And the movable base body is arranged to avoid deviation of the U-shaped pipe, the cooling plate body disassembly and assembly convenience is improved, and the service life is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery packs, and in particular relates to a fireproof battery pack for a hybrid electric vehicle. Background Art

[0002] According to the state of the new energy vehicle when it caught fire, the causes of the fire can be summarized into four types: fire during charging, fire due to collision, fire due to immersion in water, and fire due to parking. Lithium batteries are "lively" and have extremely high chemical activity. When metal lithium comes into direct contact with oxygen, it will cause violent combustion and explosion. The charging and discharging of lithium-ion batteries is the process of lithium ions being embedded, moved, and de-embedded between the positive and negative electrodes. When overcharging occurs, too many lithium ions are embedded in the negative electrode carbon layer and cannot be de-embedded. At the negative end, lithium atoms are saturated, causing lithium metal to accumulate on the surface of the negative electrode material, forming dendrites - lithium dendrites. The "growth" of lithium dendrites consumes electrolyte on the one hand, and causes battery short circuit on the other hand, leading to combustion or explosion. When the vehicle is driving at high speed, the collision causes the car to deform, and the battery packs are squeezed and deformed against each other, eventually causing rupture and short circuit, resulting in local heat accumulation of the battery, combustion and fire. At the same time, violent collisions themselves may also generate sparks, which are very easy to burn when combustible substances such as electrolytes come into contact with oxygen. Most of the power battery boxes for new energy vehicles have a waterproof rating of IP67 or above, that is, they can be immersed for thirty minutes when the distance from the bottom of the battery to the water surface is 1 meter and the top to the water surface is 0.15 meters. It is no problem on rainy days, but if the sealing of the battery box does not meet the waterproof requirements or the battery box is immersed in water for a long time, it is very easy for the battery pack to get into the water, causing the internal battery cells to short-circuit and thus cause the battery to catch fire. There may be two aspects of fire in this state: First, when the car is stopped, the cooling system stops working, and the heat of the battery is not completely dissipated. The heat accumulates locally, causing high temperature and causing combustion; second, affected by the ambient temperature, a large amount of heat radiated from the ground in hot weather is absorbed by the battery pack, and long-term operation causes thermal runaway of the power battery, thus catching fire. Faced with multiple causes of fire, different technical structural improvements have been made to batteries on the market to avoid fires, but there are still many shortcomings.

[0003] The prior art provides some solutions, such as patent KR102642150B1, which provides a fire protection module for electric vehicle batteries. In the case of a fire protection module in a battery for an electric vehicle, inside a battery bag where the battery is placed; and a sensor unit, which is connected to the battery and signals the inflator to activate when the temperature of the battery rises above a certain level; and an inflator, which receives a signal from the sensor unit, generates high-pressure air and moves to the vacuum forming part; and a vacuum forming part, which moves the high-pressure air through the operation of the inflator and extracts the air from the battery bag, thereby vacuuming the battery bag. However, the fire protection structure still has the problem of complex structure, and fire extinguishing in a vacuum environment is prone to air leakage, resulting in poor fire extinguishing effect. Utility Model Content

[0004] The utility model aims to provide a battery core which can prevent battery chain combustion, extinguish fire immediately and with good fire extinguishing effect, and can reduce battery temperature at the same time.

[0005] The technical solution adopted by the utility model to achieve the above-mentioned purpose is:

[0006] A fireproof battery cell for a hybrid electric vehicle comprises a box body, a U-shaped beam is arranged at the center of the box body, a plurality of battery cells are arranged side by side on the left and right sides of the U-shaped beam, a cooling plate body is arranged below the battery cell, the cooling plate body comprises at least two first plates, a plurality of U-shaped tubes are arranged between the first plates, a movable base body is arranged between the U-shaped tubes, and a first patch is attached to any surface of the U-shaped beam, the cooling plate body and the U-shaped tube.

[0007] Furthermore, a coolant may flow through the U-shaped tube, and the coolant passes through the U-shaped tube to directly act on the first plate body to cool the battery. Since the battery cell is arranged above the first plate body, the temperature of the battery cell can be further reduced by this arrangement. The battery cells are arranged at intervals to avoid heat concentration, so that the cooling plate body laid under the battery cell can better act on each battery cell, further improving the cooling effect. The spacing between the battery cells is also conducive to preventing open flames or excessive temperatures from igniting adjacent batteries.

[0008] Furthermore, holes are provided on the U-shaped beam, and the holes are used to connect the battery cells in series to improve the overall utilization efficiency of the battery.

[0009] Furthermore, the first patch may be a fire extinguishing patch.

[0010] Furthermore, a fire extinguishing sticker can be affixed to the surface of the U-shaped beam and the surface of the cooling plate body or the inner surface of the box body, and the fire extinguishing sticker adopts a perfluorohexanone fire extinguishing patch. When the fire extinguishing sticker of the above-mentioned coating is used, it can be achieved that when the perfluorohexanone fire extinguishing patch is exposed to a temperature of 80-130°C and / or an open flame environment, it can break and vaporize to release the fire extinguishing material to achieve the purpose of cooling and / or fire prevention and / or fire extinguishing, thereby suppressing thermal runaway, actively cooling, and actively extinguishing fires; in addition, the use of perfluorohexanone as a fire extinguishing agent greatly reduces the gasification loss of perfluorohexanone in the microcapsule under normal conditions, and has a longer service life. It should be noted that perfluorohexanone quickly vaporizes after extinguishing the fire, is non-conductive, does not pollute the protected object, does not damage the battery cell and the chassis of the vehicle, can greatly reduce the loss, and can prevent other parts of the vehicle body from being damaged.

[0011] In the utility model, the box body also includes a frame unit, the U-shaped beam is arranged at the center of the square frame unit, and the battery core is arranged in the frame unit.

[0012] In the present invention, the frame unit comprises at least two transverse plates arranged parallel to the U-shaped beams and side plates vertically connected to the transverse plates, and a plurality of square holes are formed on the side plates.

[0013] Furthermore, the side panels and the horizontal panels frame the cells. After the cells are placed, the top panel can be covered to protect the entire battery pack. At the same time, the frame unit can divide the internal cells into multiple battery groups for subsequent replacement and maintenance. At the same time, the square hole design can promote air flow through the inner wall of the side panel, thereby taking away the heat of the cells attached to the surface of the side panel, further improving the service life of the battery pack.

[0014] In the utility model, the battery core is in contact with the cooling plate body, a partition bar is arranged between the cooling plate bodies, a groove is arranged above the first plate body, and the battery core is arranged in the groove.

[0015] Furthermore, by providing grooves and separators to fix the battery cells in specific positions, the battery cells can be prevented from shaking when the car starts. The shaking of the battery cells may cause the battery pack to be squeezed and deformed against each other, eventually causing rupture and short circuit, resulting in local heat accumulation in the battery and combustion and fire.

[0016] In the utility model, the movable base body arranged in the first plate body includes a first sleeve, and the first sleeve can cooperate with the U-shaped tube. The upper surface of the movable base body is also provided with a plug-in plate, and the plug-in plate is cooperated and connected with the inner wall of the first plate body.

[0017] Furthermore, the movable base can slide relative to the first plate body, and its purpose is that when the car is in a high-speed motion state, its braking and deceleration are likely to impact the internal U-shaped tube, which is likely to cause the U-shaped tube to deviate or the U-shaped tube to rupture after being impacted and leak the internal coolant. When the car is in high-speed motion, the structure of the movable base is added, and the first sleeve included in the movable base can lock the U-shaped tube to prevent it from relative displacement. At the same time, the plug-in board is slidably connected to the inner wall of the first plate body, so the impact caused by the braking or deceleration of the car can drive the movable base to move forward and backward relative to the first plate body, avoiding the displacement of the U-shaped tube, and the convenience of disassembly and assembly of the U-shaped tube can be improved by setting the movable base.

[0018] In the utility model, at least two bottom plates are arranged below the cooling plate body, and exhaust passages are opened on the bottom plates.

[0019] Furthermore, the bottom plate is arranged below the cooling plate body and is provided with an exhaust channel, which can further enhance the cooling effect. The exhaust channel arranged at the bottom can affect the cooling effect of the coolant in the U-shaped tube, thereby preventing the temperature below the first plate body from rising rapidly.

[0020] In the present invention, the bottom plate is fixedly connected to the frame unit, and there is a distance between the two bottom plates. The main purpose of this distance is to place the U-shaped tube, so that the tube body part of the U-shaped tube extending to the outside is arranged between the two bottom plates, further improving the effect of coolant heat exchange.

[0021] Compared with the prior art, the technical progress of the utility model lies in that a fire extinguishing sticker is attached to the surface of the U-shaped beam to achieve the functions of suppressing thermal runaway, active cooling, and active fire extinguishing. At the same time, a cooling plate structure is added at the bottom of the battery cell to dissipate the heat of the battery cell. The battery cell is fixed in a specific position by providing grooves and separators to prevent it from colliding, squeezing, deforming, and catching fire. The movable base is provided to prevent the U-shaped tube from shifting, improve the convenience of disassembly and assembly of the cooling plate body, and increase the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of a fireproof battery pack for a hybrid vehicle involved in the utility model;

[0023] Figure 2 This is a schematic diagram of the internal structure of the cooling plate body involved in the utility model;

[0024] Figure 3 The utility model is a schematic diagram of the plug board structure.

[0025] Explanation of the reference numerals: 1-box; 11-frame unit; 111-cross plate; 112-side plate; 113-square hole; 13-U-shaped beam; 2-cooling plate; 21-first plate; 22-U-shaped tube; 23-movable base; 231-first sleeve; 232-plug-in plate; 24-partitioning strip; 3-bottom plate; 31-exhaust channel. DETAILED DESCRIPTION

[0026] Embodiment 1:

[0027] Reference Figure 1 As shown, a fireproof battery cell for a hybrid electric vehicle comprises a box body 1, wherein a U-shaped beam 13 is arranged at the center of the box body 1, and a plurality of battery cells are arranged side by side on the left and right sides of the U-shaped beam 13, and a cooling plate body 2 is arranged below the battery cell, wherein the cooling plate body 2 comprises at least two first plates 21, and a plurality of U-shaped tubes 22 are arranged between the first plates 21, and a movable base 23 is arranged between the U-shaped tubes 22, and a first patch is attached to any surface of the U-shaped beam (13), the cooling plate body (2) and the U-shaped tube (22).

[0028] Furthermore, a coolant may flow through the U-shaped tube 22, and the coolant passes through the U-shaped tube 22 to directly act on the first plate 21 to cool the battery. Since the battery cell is arranged above the first plate 21, the temperature of the battery cell can be further reduced by this arrangement, and the battery cells are arranged at intervals to avoid heat concentration, so that the cooling plate 2 laid under the battery cell can better act on each battery cell, further improving the cooling effect. The intervals between the battery cells are also conducive to preventing open flames or excessive temperatures from igniting adjacent batteries.

[0029] Furthermore, holes are provided on the U-shaped beam 13, which can promote air circulation inside the box body 1 and prevent the battery core from overheating and causing combustion.

[0030] Furthermore, the first patch may be a fire extinguishing patch.

[0031] Furthermore, a fire extinguishing sticker can be affixed to the surface of the U-shaped beam and the surface of the cooling plate body 2 or the inner surface of the box body 1, and the fire extinguishing sticker adopts a perfluorohexanone fire extinguishing patch. When the fire extinguishing sticker of the above-mentioned coating is used, it can be achieved that when the perfluorohexanone fire extinguishing patch is exposed to a temperature of 80-130°C and / or an open flame environment, it can break and vaporize to release the fire extinguishing material to achieve the purpose of cooling and / or fire prevention and / or fire extinguishing, thereby suppressing thermal runaway, actively cooling, and actively extinguishing fires; in addition, the use of perfluorohexanone as a fire extinguishing agent greatly reduces the gasification loss of perfluorohexanone in the microcapsule under normal conditions, and has a longer service life. It should be noted that perfluorohexanone quickly vaporizes after extinguishing the fire, is non-conductive, does not pollute the protected object, does not damage the battery cell and the chassis of the vehicle, can greatly reduce the loss, and can prevent other parts of the vehicle body from being damaged.

[0032] The fire extinguishing sticker of the present invention can refer to patent CN114736554A and patent CN114748830A.

[0033] Embodiment 2:

[0034] Reference Figure 2 , Figure 3 As shown, in the present invention, the box body 1 further includes a frame unit 11 , the U-shaped beam 13 is arranged at the center of the square frame unit 11 , and the battery cell is arranged in the frame unit 11 .

[0035] In the present invention, the frame unit 11 includes at least two transverse plates 111 arranged parallel to the U-shaped beams 13 and side plates 112 vertically connected to the transverse plates 111 , and a plurality of square holes 113 are formed on the side plates 112 .

[0036] Furthermore, the side panels 112 and the horizontal panels 111 frame the cells. After the cells are placed, the top panel can be covered to protect the entire battery pack. At the same time, the frame unit 11 can divide the internal cells into multiple battery groups for subsequent replacement and maintenance. At the same time, the design of the square holes 113 can promote air flow through the inner wall of the side panels 112, thereby taking away the heat of the cells attached to the surface of the side panels 112, further improving the service life of the battery pack.

[0037] In the present invention, the battery core is in contact with the cooling plate body 2 , a partition bar 24 is provided between the cooling plate bodies 2 , a groove is provided above the first plate body 21 , and the battery core is provided in the groove.

[0038] Furthermore, by providing grooves and separators 24 to fix the battery cells in specific positions, the battery cells can be prevented from shaking when the car starts. Shaking of the battery cells may cause the battery packs to be squeezed and deformed against each other, eventually resulting in rupture and short circuit, causing local heat accumulation in the battery and burning.

[0039] In the utility model, the movable base 23 arranged in the first plate body 21 includes a first sleeve 231, and the first sleeve 231 can cooperate with the U-shaped tube 22. The upper surface of the movable base 23 is also provided with a plug-in board 232, and the plug-in board 232 is connected with the inner wall of the first plate body 21.

[0040] Furthermore, the movable base 23 can slide relative to the first plate 21. The purpose is that when the car is in a high-speed motion state, its braking and deceleration are likely to impact the internal U-shaped tube 22, which is likely to cause the U-shaped tube 22 to deviate or the U-shaped tube 22 to rupture and leak the internal coolant after being impacted. When the car is in high-speed motion, the structure of the movable base 23 is added. The first sleeve 231 included in the movable base 23 can lock the U-shaped tube 22 to prevent it from relative displacement. At the same time, the plug-in board 232 is slidably connected to the inner wall of the first plate 21. Therefore, the impact caused by the braking or deceleration of the car can drive the movable base 23 to move forward and backward relative to the first plate 21, avoiding the displacement of the U-shaped tube 22, and the convenience of disassembly and assembly of the U-shaped tube 22 can be improved by setting the movable base 23.

[0041] In the present invention, at least two bottom plates 3 are arranged below the cooling plate body 2 , and an exhaust passage 31 is opened on the bottom plate 3 .

[0042] Furthermore, the bottom plate 3 is arranged below the cooling plate body 2 and is provided with an exhaust channel 31, which can further enhance the cooling effect. The exhaust channel 31 arranged at the bottom can affect the cooling effect of the coolant in the U-shaped tube 22, thereby preventing the temperature below the first plate body 21 from rising rapidly.

[0043] In the present invention, the bottom plate 3 is fixedly connected to the frame unit 11, and there is a distance between the two bottom plates 3. The main purpose of the distance is to place the U-shaped tube 22, so that the tube body part of the U-shaped tube 22 extending to the outside is arranged between the two bottom plates 3, further improving the effect of coolant heat exchange.

[0044] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is defined by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims involved.

Claims

1. A fireproof battery pack for a hybrid electric vehicle, comprising a box body (1), wherein a U-shaped beam (13) is arranged at the center of the box body (1), and a plurality of battery cells are arranged side by side on the left and right sides of the U-shaped beam (13), characterized in that: A cooling plate (2) is provided below the battery cell, the cooling plate (2) comprising at least two first plates (21), a plurality of U-shaped tubes (22) are arranged between the first plates (21), a movable base (23) is provided between the U-shaped tubes (22), and a first patch is attached to any surface of the U-shaped beam (13), the cooling plate (2) and the U-shaped tube (22).

2. The fireproof battery pack for hybrid electric vehicles according to claim 1, characterized in that: The box body (1) further comprises a frame unit (11), the U-shaped beam (13) is arranged at the centre of the square frame unit (11), and the battery cell is arranged inside the frame unit (11).

3. The fireproof battery pack for hybrid electric vehicles according to claim 2, characterized in that: The frame unit (11) comprises at least two transverse plates (111) arranged parallel to the U-shaped beams (13) and side plates (112) vertically connected to the transverse plates (111), wherein a plurality of square holes (113) are provided on the side plates (112).

4. The fireproof battery pack for hybrid electric vehicles according to claim 1, characterized in that: The battery core is in contact with the cooling plate body (2), a partition bar (24) is provided between the cooling plate bodies (2), a groove (24) is provided above the first plate body (21), and the battery core is arranged in the groove (2).

5. The fireproof battery pack for hybrid electric vehicles according to claim 4, characterized in that: The movable base (23) disposed in the first plate body (21) comprises a first sleeve (231), the first sleeve (231) being capable of cooperating with the U-shaped tube (22), and a plug-in board (232) being disposed on the upper surface of the movable base (23), the plug-in board (232) being cooperatingly connected with the inner wall of the first plate body (21).

6. The fireproof battery pack for hybrid electric vehicles according to claim 2, characterized in that: At least two bottom plates (3) are arranged below the cooling plate body (2), and an exhaust channel (31) is provided on the bottom plate (3).

7. The fireproof battery pack for hybrid electric vehicles according to claim 6, characterized in that: The bottom plate (3) is fixedly connected to the frame unit (11), and there is a distance between the two bottom plates (3).

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