阅读说明：本技术 一种电池包热失控监控系统及电动汽车 (Battery package thermal runaway monitored control system and electric automobile ) 是由 马钊 邹荣莲 赵运德 朱华昌 于 2020-06-11 设计创作，主要内容包括：本发明公开了一种电池包热失控监控系统及电动汽车,系统包括电池管理系统和设置于所述电池包内的：光信号发生器,用于发射出射光；反光部,用于反射所述出射光得到反射光；第一光信号接收器,用于接收反射光并转化为电信号；电池管理系统与光信号发生器和第一光信号接收器电连接,并对第一光信号接收器反馈的电信号进行处理,根据处理结果判定是否存在热失控风险。本发明根据烟雾对光线的阻隔会造成光强损失的原理来检测电池包是否发生热失控事件,在电池包热失控初期产生少量烟雾时就能够及时准确的检测,并且不受环境影响。本监控系统内置于电池包中,不会影响电池包的装配。本监控系统的光源没有限定,可以是任何波段,具有更好的适应性。(The invention discloses a battery pack thermal runaway monitoring system and an electric automobile, wherein the system comprises a battery management system and a battery pack, wherein the battery pack is arranged in the battery pack: an optical signal generator for emitting an outgoing light; the light reflecting part is used for reflecting the emergent light to obtain reflected light; the first optical signal receiver is used for receiving the reflected light and converting the reflected light into an electric signal; the battery management system is electrically connected with the optical signal generator and the first optical signal receiver, processes the electric signals fed back by the first optical signal receiver, and judges whether a thermal runaway risk exists according to the processing result. The invention detects whether the battery pack has a thermal runaway event according to the principle that light intensity loss is caused by light obstruction of smoke, can timely and accurately detect when a small amount of smoke is generated at the initial stage of thermal runaway of the battery pack, and is not influenced by the environment. The monitoring system is arranged in the battery pack, and the assembly of the battery pack cannot be influenced. The light source of the monitoring system is not limited, can be in any wave band, and has better adaptability.)

1. The utility model provides a battery package thermal runaway monitored control system which characterized in that, including battery management system with set up in optical signal generator, reflection of light portion and first optical signal receiver in the battery package:

the optical signal generator is positioned in the upper space of the battery module in the battery pack and used for emitting emergent light to the battery module;

the at least one light reflecting part is used for reflecting the emergent light to obtain reflected light;

the first optical signal receiver is positioned in the upper space of the battery module in the battery pack and used for receiving the reflected light and converting the reflected light into an electric signal;

the battery management system is electrically connected with the optical signal generator and the first optical signal receiver and is used for controlling the optical signal generator to emit the emitted light, carrying out signal processing on the electric signal fed back by the first optical signal receiver and judging whether the thermal runaway risk exists or not according to the processing result.

2. The system for monitoring the thermal runaway of the battery pack according to claim 1, wherein the battery management system is specifically configured to obtain the light intensity of the reflected light received by the first optical signal receiver according to an electrical signal fed back by the first optical signal receiver, and determine that smoke is generated in the battery pack and alarm if the light intensity of the reflected light is lower than a preset threshold.

3. The system for monitoring the thermal runaway of a battery pack according to claim 1, further comprising a second optical signal receiver located in a space above the battery module in the battery pack and configured to detect a wavelength of a fire occurring in the battery pack and convert the fire signal into an electrical signal.

4. The system for monitoring the thermal runaway of the battery pack according to claim 3, wherein the battery management system is specifically configured to determine that a fire has occurred in the battery pack according to the electrical signal fed back by the second optical signal receiver and to alarm.

5. The system of claim 1, further comprising a structural member located in an upper space of the battery module within the battery pack, the optical signal generator and the first optical signal receiver being disposed on the structural member.

6. The battery pack thermal runaway monitoring system of claim 5, wherein the structural member is rotatably coupled within the battery pack, and the optical signal generator scans the interior of the battery pack as the structural member rotates.

7. The system of claim 6, wherein a support column is disposed in the battery pack to support an upper shell of the battery pack, and the structural member is rotatably sleeved on the support column relative to the support column.

8. The battery pack thermal runaway monitoring system of claim 5, wherein the structural member is fixedly connected within the battery pack, the structural member comprises a cylindrical surface, and the plurality of optical signal generators are distributed on the same circumference of the cylindrical surface to scan the interior of the battery pack.

9. The battery pack thermal runaway monitoring system of claim 6 or 8, wherein the structure is disposed at a top corner of the battery pack and the scan angle of the optical signal generator is 90 °.

10. An electric vehicle comprising the battery pack thermal runaway monitoring system of any one of claims 1-9.

Technical Field

The invention belongs to the technical field of power batteries, and particularly relates to a battery pack thermal runaway monitoring system and an electric automobile.

Background

The reliability of the battery pack is an important safety performance index of the electric automobile, the mainstream battery used in the current battery pack is a lithium ion battery, the activity of the lithium ion battery is high, and serious consequences are often accompanied when a thermal runaway event of the battery pack occurs.

At present, the method for detecting the thermal runaway in the battery pack mainly comprises the following steps: (1) the smoke sensor is used for sensing smoke components in thermal runaway, and the method has certain hysteresis. (2) The pressure sensor is used for detecting the pressure which is increased steeply when the battery core bursts, but the pressure sensor is easily influenced by factors such as the altitude and the transportation mode.

Therefore, it is urgent to develop a sensitive and reliable battery pack thermal runaway monitoring system which is not affected by the environment.

Disclosure of Invention

The technical problem to be solved by the embodiments of the present invention is to provide a battery pack thermal runaway monitoring system and an electric vehicle, so as to solve the problem that the existing battery pack thermal runaway detection method is not delayed in detection or is affected by the environment.

In order to solve the above technical problem, the present invention provides a battery pack thermal runaway monitoring system, which includes a battery management system, and an optical signal generator, a light reflection portion and a first optical signal receiver that are arranged in the battery pack:

the optical signal generator is positioned in the upper space of the battery module in the battery pack and used for emitting emergent light to the battery module;

the light reflecting part is at least provided with one light reflecting part and is used for reflecting the emergent light to obtain reflected light;

the first optical signal receiver is positioned in the upper space of the battery module in the battery pack and used for receiving the reflected light and converting the reflected light into an electric signal;

the battery management system is electrically connected with the optical signal generator and the first optical signal receiver and is used for controlling the optical signal generator to emit the emitted light, carrying out signal processing on the electric signal fed back by the first optical signal receiver and judging whether the thermal runaway risk exists or not according to the processing result.

Further, the battery management system is specifically configured to obtain the light intensity of the reflected light received by the first optical signal receiver according to an electrical signal fed back by the first optical signal receiver, and if the light intensity of the reflected light is lower than a preset threshold, it is determined that smoke has been generated in the battery pack and an alarm is given.

Further, still include the second light signal receiver, be located battery module upper portion space in the battery package for detect the wavelength of the light of a fire that takes place in the battery package, and convert the light of a fire signal into the signal of telecommunication.

Further, the battery management system is specifically used for judging that the fire light is generated in the battery pack according to the electric signal fed back by the second optical signal receiver and giving an alarm.

Further, still include the structure that is located battery module headspace in the battery package, light signal generator and first light signal receiver set up on the structure.

Further, the structural part is rotatably connected in the battery pack, and when the structural part rotates, the optical signal generator scans the interior of the battery pack.

Furthermore, a support column for supporting the upper shell of the battery pack is arranged in the battery pack, and the structural member is rotatably sleeved on the support column relative to the support column.

Furthermore, the structural part is fixedly connected in the battery pack and comprises a cylindrical surface, and the optical signal generators are distributed on the same circumference of the cylindrical surface and scan the interior of the battery pack.

Further, the structural part is arranged at the top corner of the battery pack, and the scanning angle of the optical signal generator is 90 degrees.

An electric vehicle comprises the battery pack thermal runaway monitoring system.

The embodiment of the invention has the following beneficial effects: the invention detects whether the battery pack has a thermal runaway event according to the principle that light intensity loss is caused by light obstruction of smoke, can timely and accurately detect when a small amount of smoke is generated at the initial stage of thermal runaway of the battery pack, and is not influenced by the environment. The monitoring system is arranged in the battery pack, and the assembly of the battery pack cannot be influenced. In addition, the light source of the monitoring system is not limited, and can be in any wave band, so that the monitoring system has better adaptability.

Drawings

In order to more clearly illustrate the embodiments of the present invention 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 invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a block diagram of a battery pack thermal runaway monitoring system according to an embodiment of the invention.

Fig. 2 is a structural (top view) and operational schematic diagram of a battery pack thermal runaway monitoring system according to an embodiment of the present invention.

Fig. 3 is an enlarged view of a portion a of fig. 2.

Fig. 4 is a diagram of a structure (top view) and a scanning effect of another battery pack thermal runaway monitoring system according to an embodiment of the invention.

Fig. 5 is a schematic connection diagram (side view) of a structural member 9 and a battery pack according to an embodiment of the present invention.

Fig. 6 is a schematic view of another connection structure 9 and a battery pack according to an embodiment of the present invention (a cross-sectional view taken along line B-B of fig. 4).

Fig. 7 is a distribution diagram (top view) of an optical signal generator 1 on a structural member 9 according to an embodiment of the present invention.

Fig. 8 is a block diagram of a battery pack thermal runaway monitoring system according to a second embodiment of the present invention.

Detailed Description

The following description of the embodiments refers to the accompanying drawings, which are included to illustrate specific embodiments in which the invention may be practiced.

An embodiment of the present invention provides a battery pack thermal runaway monitoring system, as shown in fig. 1, which specifically includes: a Battery Management System (BMS) 4, and an optical signal generator 1, a light reflecting part 2, and a first optical signal receiver 3 disposed in the Battery pack.

The structure of the battery pack can be seen in fig. 2, and includes a housing 6 and a plurality of battery modules 7 accommodated in the housing 6 and arranged at intervals. The optical signal generator 1 and the first optical signal receiver 3 are located in the upper space of the battery module in the battery pack, namely, above the battery module 7 in the battery pack and below the upper cover of the housing 6, and the optical signal generator 1 is used for emitting emergent light to the battery module. The setting of reflection of light portion 2 is in the battery package, sets up one at least, when setting up a plurality ofly, can be along the inner wall evenly distributed of shell 6, and reflection of light portion 2 is used for the reflection emergent light to obtain the reverberation, and first light signal receiver 3 is used for receiving the reverberation and converts the signal of telecommunication into. The battery management system 4 is electrically connected to the optical signal generator 1 and the first optical signal receiver 3 (indicated by a dotted line in the figure), and is configured to control the optical signal generator 1 to emit the outgoing light, perform signal processing on the electrical signal fed back by the first optical signal receiver 3, and determine whether a thermal runaway risk exists according to a processing result.

The working process and the principle of the battery pack thermal runaway monitoring system are as follows: the BMS controls the light signal generator 1 to emit an outgoing light, wherein the light signal generator may be a light emitting diode or a light source of a specific wavelength, for example a certain wavelength in the visible or infrared band. The outgoing light is reflected at least once by the light reflecting portion 2, which is preferably a smooth curved surface with specular reflection, with minimal loss of light intensity during reflection. The resulting reflected light reaches the first optical signal receiver 3, which first optical signal receiver 3 may be a photodiode. First optical signal receiver 3 converts the light signal into the electric signal, carries out signal processing after the BMS receives the electric signal to whether there is the thermal runaway risk according to the processing result judgement. Specifically, the BMS calculates the light intensity of the reflected light received by the first optical signal receiver 3 through the acquired electrical signal, and if the light intensity of the reflected light is greater than or equal to a preset threshold, it indicates that the light is only reflected by the light reflecting portion, the loss is small, and it can be determined that the battery pack is in a safe state. When producing smog in the battery package, smog diffuses in the battery package, must hinder the light path, weakens the light intensity that first light signal receiver 3 received, and the light intensity of reverberation is less than and predetermines the threshold value this moment, recognizes smog promptly and produces, and BMS sends out the warning. Of course, the determination may be made based on the loss of the intensity of the reflected light with respect to the intensity of the emitted light (relative value), in addition to the intensity of the reflected light (absolute value).

The invention detects whether the battery pack has a thermal runaway event according to the principle that light intensity loss is caused by light obstruction of smoke, can timely and accurately detect when a small amount of smoke is generated at the initial stage of thermal runaway of the battery pack, and is not influenced by the environment. The monitoring system is arranged in the battery pack, and the assembly of the battery pack cannot be influenced. In addition, the light source of the monitoring system is not limited, and can be in any wave band, so that the monitoring system has better adaptability.

Further, referring to fig. 2 and 3, the light reflecting portion 2 may be a metal cylinder with a high surface finish or other specular-reflective inner wall structure of the battery pack, for example, a plurality of smooth curved structures may be disposed on the inner wall. In the embodiment of the present invention, the optical signal generator 1 and the first optical signal receiver 3 may be integrated, that is, disposed on the same structural component 9. The invention provides the following embodiments of the arrangement of the structural member 9 and the scanning mode of the optical signal generator 1.

In the first structure, the structural member 9 is rotatably connected in the battery pack, in one embodiment, as shown in the top view of fig. 4 and the side view of fig. 5, the structural member 9 is rotatably disposed at any position inside the upper cover of the housing 6, when the structural member 9 rotates, the optical signal generator 1 scans the inside of the battery pack for 180 °, and the height of the side wall of the housing 6 corresponding to the optical signal generator 1 is provided with a smooth curved surface, that is, the light reflecting portion 2 reflects the scanning light and is received by the first optical signal receiver 3 disposed on the structural member 9. In another embodiment, as shown in fig. 6 (a cross-sectional view taken along the line of fig. 4B-B), a supporting column 10 for supporting the upper shell of the battery pack is provided inside the battery pack, so that in order to avoid light being blocked by the supporting column 10, the structural member 9 can be sleeved on the supporting column 10, for example, by a bearing connection, and the motor drives the structural member 9 to rotate relative to the supporting column 10, so as to scan the inside of the battery pack by 180 °. In the above structure, the optical signal generator 1 and the first optical signal receiver 3 are correspondingly arranged one by one, and the scanning is completed by the assistance of the rotary driving mechanism.

In the second structure, as shown in fig. 7, the structural member 9 is fixedly connected in the battery pack, the structural member 9 includes a cylindrical surface, the optical signal generators 1 are provided with a plurality of optical signal generators, distributed on the same circumference of the cylindrical surface, similar to the horse race lamp effect, and scan the inside of the battery pack by 180 degrees. In this configuration, when the driving mechanism is simplified, the optical signal generator 1 and the first optical signal receiver 3 need to be provided in a plurality of corresponding units so as to obtain the same scanning effect.

Based on the above embodiment, the present invention provides a further optimized structure, specifically, the structural component 9 is disposed at the top corner of the battery pack, referring to fig. 2, so that the optical signal generator 1 can be fully covered by scanning only 90 °, and in the corresponding second structure, the cylindrical surface of the structural component 9 can be set as a quarter cylindrical surface. The optimization scheme can reduce power consumption or the number of components.

Based on the first embodiment, the second embodiment of the present invention provides a battery pack thermal runaway monitoring system capable of further detecting fire, as shown in fig. 8, the thermal runaway monitoring system further includes a second optical signal receiver 5 located in an upper space of a battery module in the battery pack, the second optical signal receiver 5 may also be disposed on the same structural member 9 together with the optical signal generator 1 and the first optical signal receiver 3, as shown in fig. 3, the optical signal generator 1 and the first optical signal receiver 3 are disposed on an upper portion 91 of the structural member 9, and the second optical signal receiver 5 is disposed on a lower portion 92 of the structural member 9. The second optical signal receiver 5 may also be a light-sensitive device for detecting the wavelength of the fire light generated in the battery pack and converting the detected fire light signal into an electrical signal to feed back to the BMS, and the BMS determines that the fire light is generated in the battery pack and gives an alarm according to the electrical signal fed back by the second optical signal receiver. In this embodiment, the characteristic wavelength at the initial stage of combustion is determined according to the material in the battery module, and the photosensor of the corresponding dedicated band is selected for detection.

The invention further improves the accuracy of the thermal runaway monitoring of the battery pack by arranging the second optical signal receiver 5 to monitor the flare.

Based on the battery pack thermal runaway monitoring system, the invention also provides an electric automobile, and the power battery of the electric automobile is monitored by the battery pack thermal runaway monitoring system, so that the safety performance of the electric automobile is greatly improved.

For the working principle and process of the vehicle certificate management apparatus of this embodiment, refer to the description of the first embodiment of the present invention, and are not described herein again.

As can be seen from the above description, compared with the prior art, the beneficial effects of the present invention are: the invention detects whether the battery pack has a thermal runaway event according to the principle that light intensity loss is caused by light obstruction of smoke, can timely and accurately detect when a small amount of smoke is generated at the initial stage of thermal runaway of the battery pack, and is not influenced by the environment. The monitoring system is arranged in the battery pack, and the assembly of the battery pack cannot be influenced. In addition, the light source of the monitoring system is not limited, and can be in any wave band, so that the monitoring system has better adaptability. Finally, the invention monitors the fire light by arranging the second optical signal receiver 5, thereby further improving the accuracy of the thermal runaway monitoring of the battery pack.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.