CN216536631U

CN216536631U - Power battery and two-wheeled electric vehicle

Info

Publication number: CN216536631U
Application number: CN202122190081.4U
Authority: CN
Inventors: 王宇豪; 张成相; 周兴才; 冀宪胜; 张旭超; 马志杰; 蔡笃诚; 李飞
Original assignee: Zephyr Intelligent System Shanghai Co Ltd
Current assignee: Zephyr Intelligent System Shanghai Co Ltd
Priority date: 2021-09-10
Filing date: 2021-09-10
Publication date: 2022-05-17
Anticipated expiration: 2031-09-10

Abstract

The utility model relates to a power battery and a two-wheeled electric vehicle. When the temperature of the battery module rises rapidly and combustible smoke is generated, the temperature in the housing will rise gradually to a first preset temperature and the firewire tube will be broken. The liquid fire extinguishing agent in the bottle body is sprayed out from the crack of the fire detection pipe, and further the thermal runaway of the battery pack is continuously inhibited. When an open flame occurs, the temperature within the housing will further rise to a second preset temperature. At the moment, the aerosol fire extinguisher is triggered and releases fire extinguishing gas into the shell to extinguish fire. The liquid fire extinguishing agent can be cooled through heat absorption, so that the continuous inhibition of thermal runaway is facilitated, the gas fire extinguishing gas can be rapidly diffused to all places, and the effect of extinguishing open fire is better. Therefore, the fire extinguishing device is matched with the aerosol fire extinguisher, so that the power battery has a better fire extinguishing effect.

Description

Power battery and two-wheeled electric vehicle

Technical Field

The utility model relates to the technical field of new energy, in particular to a power battery and a two-wheeled electric vehicle.

Background

With the development of new energy technology, more and more electric vehicles adopt lithium ion batteries as power batteries. However, lithium ion batteries are susceptible to thermal runaway when the temperature is too high or overcharged, resulting in vehicle fires and irreparable loss of personnel and vehicles.

For this reason, more and more manufacturers are beginning to consider equipping power batteries with fire extinguishing devices. Conventionally, a temperature sensor is arranged outside or inside the power battery, and when the temperature rise is detected, the temperature sensor triggers the power battery to spray the fire extinguishing agent stored in the bottle body to the power battery, so as to achieve the purpose of automatic fire extinguishing. However, this method has a limited fire extinguishing effect, and is likely to cause failure in fire extinguishing due to reignition.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is desirable to provide a power battery and a two-wheeled electric vehicle having a good fire extinguishing effect.

A power cell, comprising:

a housing;

the battery pack is accommodated and fixed in the shell and is provided with a plurality of battery modules which are arranged according to a preset rule;

the fire extinguishing device accommodated in the shell comprises a bottle body and a fire detection pipe, wherein the bottle body is used for accommodating a liquid fire extinguishing agent, and the fire detection pipe is communicated with the bottle body and can be broken when a first preset temperature is reached; and

accept in aerosol fire extinguisher in the shell, aerosol fire extinguisher can trigger when the temperature is predetermine to the second, and to release fire extinguishing gas in the shell, the temperature is greater than is predetermine to the second first temperature of predetermineeing.

In one embodiment, the bottle body and the plurality of battery modules are integrated together in the battery pack.

In one embodiment, the bottle body is configured to conform to the outer contour of the battery module, and the bottle body is inserted between the adjacent battery modules.

In one embodiment, the bottle mouth of the bottle body is provided with a siphon pipe, and the siphon pipe extends towards the bottom of the bottle body.

In one embodiment, the bottle body is provided with an air inflation port.

In one embodiment, the fire detection pipe is provided in plurality, and the fire detection pipes are arranged at intervals in the arrangement direction of the battery modules.

In one embodiment, the liquid fire extinguishing agent is perfluorohexanone.

In one embodiment, the aerosol fire extinguisher comprises an aerosol shell containing gas generating agent, a heat-sensitive wire and an electric signal trigger wire, wherein the heat-sensitive wire and the electric signal trigger wire can be triggered when the temperature reaches the second preset temperature and ignite the gas generating agent.

In one embodiment, the aerosol fire extinguisher is mounted to the bottom of the housing.

A two-wheeled electric vehicle comprising a vehicle body and a power battery as described in any of the above preferred embodiments, said power battery being mounted within a battery compartment of said vehicle body.

Above-mentioned power battery and two-wheeled electric motor car, when the temperature of battery module risees rapidly and produces combustible flue gas, the temperature in the shell will rise gradually to first preset temperature to make the fire-detecting pipe break. The liquid fire extinguishing agent in the bottle body is sprayed out from the crack of the fire detection pipe, and further the thermal runaway of the battery pack is continuously inhibited. When an open flame occurs, the temperature within the housing will further rise to a second preset temperature. At the moment, the aerosol fire extinguisher is triggered and releases fire extinguishing gas into the shell to extinguish fire. The liquid fire extinguishing agent can be cooled through heat absorption, so that the continuous inhibition of thermal runaway is facilitated, the gas fire extinguishing gas can be rapidly diffused to all places, and the effect of extinguishing open fire is better. Therefore, the fire extinguishing device is matched with the aerosol fire extinguisher, so that the power battery has a better fire extinguishing effect.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a power battery according to a preferred embodiment of the utility model;

FIG. 2 is a cross-sectional view A-A of the fire suppression device of the power cell of FIG. 1;

fig. 3 is a schematic structural view of the aerosol fire extinguisher in the power battery shown in fig. 1.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the utility model.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Referring to fig. 1, the present invention provides a power battery 100 and a two-wheeled electric vehicle. The two-wheeled electric vehicle includes a vehicle body (not shown) and a power battery 100, and the power battery 100 is mounted in a battery compartment of the vehicle body. Obviously, the power battery 100 can also be applied to other vehicles or devices that need to be driven by a battery.

Further, the power battery 100 of the preferred embodiment of the present invention includes a housing 110, a battery pack 120, a fire extinguishing device 130, and an aerosol fire extinguisher 140.

The housing 110 may be a casing structure formed by plastic, metal or resin materials, and is used for accommodating other elements such as the battery pack 120 and the fire extinguishing apparatus 130, and has protection and packaging functions. The outer contour of the outer case 110 matches the inner contour of the battery compartment of the vehicle body, and may be square, cylindrical, or the like.

The battery pack 120 is accommodated and fixed in the housing 110, and the battery pack 120 has a plurality of battery modules 121 arranged according to a predetermined rule. Specifically, the plurality of battery modules 121 may be arranged in a plurality of rows and columns. The battery module 121 may be a single battery cell, or may be a composite battery cell structure formed by combining a plurality of single battery cells. The single battery cell generally adopts a lithium ion battery cell and has higher energy density. In addition, the power battery 100 is generally provided with a BMS and a thermal management system for monitoring and managing the operation state of the battery pack 120.

The fire extinguishing device 130 is housed in the housing 110. Referring also to fig. 2, the fire extinguishing apparatus 130 includes a bottle 131 and a fire-detecting tube 132. The bottle body 131 of the fire extinguishing apparatus 130 may be single or plural. The bottle 131 is used to contain and store a liquid fire suppressant. In this embodiment, the liquid fire extinguishing agent is perfluorohexanone. The perfluorohexanone is colorless, tasteless, volatile and has excellent environmental protection performance. Obviously, in other embodiments, perfluorohexanone may be replaced by other fire extinguishing agents such as heptafluoropropane.

In order to smoothly discharge the liquid fire extinguishing agent stored in the bottle 131 when necessary, the bottle 131 may be pressurized by filling a sufficient amount of nitrogen gas therein. Specifically, in the embodiment, the bottle 131 is provided with an air inlet 1311. The bottle 131 may be pressurized by filling nitrogen gas through the gas filling port 1311. In normal operation, the charging port 1311 is normally closed.

The fire probe 132 is in communication with the bottle 131 and is capable of rupturing at a first predetermined temperature. The probe tube 132 typically includes a length of relatively temperature sensitive gas tube that is ruptured in a high temperature environment of 150 to 180 degrees celsius. The initial state of the probe 132 has a high pressure therein, which is in equilibrium with the pressure in the bottle 131.

The aerosol fire extinguisher 140 is housed within the housing 110. Wherein the aerosol fire extinguisher 140 is capable of being triggered at a second predetermined temperature and releasing fire suppressing gas into the housing 110. Moreover, the second preset temperature is greater than the first preset temperature.

Referring also to fig. 3, in the present embodiment, the aerosol fire extinguisher 140 includes an aerosol housing 141, a heat sensitive wire 142 and an electrical signal trigger wire 143. The aerosol shell 141 contains gas generating agent, and the heat-sensitive wire 142 and the electric signal trigger wire 143 can be triggered when the temperature reaches a second preset temperature, and the gas generating agent is ignited.

The heat-sensitive wire can generate self-ignition when the temperature reaches a second preset temperature, so that the gas-producing medicament is ignited. The electrical signal trigger line 143 generates an electrical signal when the temperature reaches a second predetermined temperature, and the electrical signal is converted into heat energy and ignites the ignition head, and finally ignites the gas generating agent. After the gas generating agent is ignited, a large amount of high-temperature fire extinguishing gas can be generated, and the gas is cooled by the heat absorption ceramic and then flows into the shell 110, so that the purpose of fire extinguishing can be achieved.

When the battery pack 120 is overcharged or short-circuited and aged, the temperature of the battery module 121 will rise rapidly, and when the temperature exceeds the threshold value, the electrolyte will be sprayed out immediately and generate combustible smoke. The temperature may be raised to a first predetermined temperature before an open flame is generated within the housing 110. At this time, the fire tube 132 is broken, and the balance between the bottle body 131 and the fire tube 132 is broken. Due to the pressure inside the bottle 131, the slit of the fire-detecting tube 132 becomes a pressure relief opening, and the fire-extinguishing agent in the bottle 131 is released from the slit of the fire-detecting tube 132 under the action of the air pressure. The sprayed liquid fire extinguishing agent enters the housing 110 and continuously suppresses the thermal runaway of the battery pack 120 by absorbing heat and reducing the temperature.

Specifically, in the present embodiment, a siphon 1312 is provided at the mouth of the bottle 131, and the siphon 1312 extends toward the bottom of the bottle 131. The liquid fire extinguishing agent in the bottle 131 can be guided out to the bottle opening through the siphon 1312, which is beneficial for fully discharging the liquid fire extinguishing agent at the bottom of the bottle 131.

If the fire extinguishing device 130 successfully suppresses the thermal runaway, the temperature in the housing 110 decreases, and the fire is released. If the suppression against thermal runaway fails, the temperature within the housing 110 will continue to rise to the second preset temperature. The combustible gas is burned at high temperature, thereby generating open fire. At this point, the aerosol fire extinguisher 140 is triggered and releases the fire suppressing gas into the housing 110. The fire suppressing gas can be rapidly diffused to all over the inside of the housing 110, so that the open fire can be rapidly extinguished. And the liquid extinguishing agent can continuously inhibit thermal runaway and effectively prevent afterburning.

In particular, in this embodiment, the aerosol fire extinguisher 140 is mounted to the bottom of the housing 110. Fire extinguishing fumes are light in weight and generally have a tendency to rise. Thus, the aerosol fire extinguisher 140 is located at the bottom of the housing 110, which aids in the even diffusion of fire suppressing fumes.

Referring to fig. 1 again, in the present embodiment, the bottle 131 and the plurality of battery modules 121 are integrated into the battery pack 120. That is, the bottle 131 is not free in the case 110, but is included as a part of the battery pack 120. Therefore, the arrangement of the bottle 131 is only equivalent to replacing one battery module 121 in the battery pack 120 with the bottle 131, and the volume of the battery pack 120 is not increased, so that the occupied space is not increased. Therefore, compared with the conventional power battery capable of automatically extinguishing fire, the power battery 100 has smaller size, higher integration level and higher miniaturization degree.

In the present embodiment, the bottle bodies 131 are configured to conform to the outer contour of the battery modules 121, and the bottle bodies 131 are inserted between the adjacent battery modules 121.

Specifically, when the battery module 121 is cylindrical, the bottle 131 is cylindrical; when the battery module 121 has a square shape, the bottle 131 is configured to have a square shape. In this way, the bottle 131 and the plurality of battery modules 121 can be better integrated and close to each other, thereby further reducing the volume of the power battery 100.

In the present embodiment, the fire probe 132 is provided in plurality, and the plurality of fire probe 132 are arranged at intervals in the arrangement direction of the battery modules 121. As shown in fig. 1, the plurality of battery modules 121 are arranged in the horizontal direction, and the plurality of fire probes 132 are arranged at intervals in the horizontal direction. Thus, when any one of the battery modules 121 is out of thermal runaway, the corresponding fire detection pipe 132 can be used for detecting dangerous situations in time and conveying the liquid fire extinguishing agent to a fire point in time.

Further, in the present embodiment, the bottle 131 is located at the middle of the battery pack 120. When a fire occurs in the power battery 100, the liquid fire extinguishing agent in the bottle 131 can more uniformly reach the crack of each fire detection pipe 132 due to the centering of the bottle 131, so as to rapidly extinguish the fire.

When the temperature of the battery module 121 rises rapidly and combustible smoke is generated, the temperature in the housing 110 rises gradually to the first preset temperature, and the fire-detecting tube 132 is broken. The liquid fire extinguishing agent in the bottle 131 is sprayed from the crack of the fire-detecting pipe 132, and thus the thermal runaway of the battery pack 120 is continuously suppressed. When an open flame is generated, the temperature within the housing 110 will further increase to a second preset temperature. At this point, the aerosol fire extinguisher 140 is triggered and releases the fire suppressing gas into the housing 110 to extinguish the fire. The liquid fire extinguishing agent can be cooled through heat absorption, so that the continuous inhibition of thermal runaway is facilitated, the gas fire extinguishing gas can be rapidly diffused to all places, and the effect of extinguishing open fire is better. Therefore, the fire extinguishing device 130 is matched with the aerosol fire extinguisher 140, so that the power battery 100 has a good fire extinguishing effect.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A power cell, comprising:

a housing;

accept in the aerosol fire extinguisher in the shell, the aerosol fire extinguisher can trigger when the second is predetermine the temperature, and to release fire extinguishing gas in the shell, the second is predetermine the temperature and is greater than first predetermined temperature.

2. The power battery as claimed in claim 1, wherein the bottle body and the plurality of battery modules are integrated together in the battery pack.

3. The power battery as claimed in claim 2, wherein the bottle body is configured to conform to the outer contour of the battery modules, and the bottle body is inserted between the adjacent battery modules.

4. The power battery of claim 1, wherein the bottle mouth of the bottle body is provided with a siphon, and the siphon extends towards the bottom of the bottle body.

5. The power battery as claimed in claim 1, wherein the bottle body is provided with an air inflation port.

6. The power battery according to claim 1, wherein the fire probe tube is provided in plurality, and the fire probe tubes are arranged at intervals in the arrangement direction of the battery modules.

7. The power cell of claim 1, wherein the liquid fire extinguishing agent is perfluorohexanone.

8. The power battery of claim 1, wherein the aerosol fire extinguisher comprises an aerosol housing containing a gas generating agent, a heat sensitive wire and an electrical signal trigger wire, the heat sensitive wire and the electrical signal trigger wire being capable of being triggered when the temperature reaches the second predetermined temperature and igniting the gas generating agent.

9. The power cell of claim 8, wherein the aerosol fire extinguisher is mounted to the bottom of the housing.

10. A two-wheeled electric vehicle comprising a vehicle body and a power battery as claimed in any one of claims 1 to 9, said power battery being mounted in a battery compartment of said vehicle body.