An external composite thermal runaway detection device for battery pack

Abstract

The utility model provides an external composite thermal runaway detection device for a battery pack, comprising a battery pack frame, a battery pack is placed in the battery pack frame, and a first through hole is provided in the battery pack frame; a first fixing member, the first fixing member is provided with a first connecting portion and is fixedly connected to the battery pack frame, and a second through hole is provided in the first fixing member; a fan assembly comprises a fan and a motor, the fan assembly is fixedly connected to the first fixing member and is arranged in the second through hole; a first sealing member is arranged between the battery pack frame and the first fixing member; a second fixing member is detachably connected to the first fixing member; a second sealing member is arranged between the first fixing member and the second fixing member; a detection circuit module, the detection circuit module is arranged on a side of the fan assembly facing away from the battery pack frame, and the detection circuit module is fixedly connected in the first fixing member or in the second fixing member. The utility model has fast response, high sensitivity, and is easy to disassemble.

Description

Technical Field

[0001] The utility model relates to the technical field of battery pack safety prevention and control, and in particular to an external composite thermal runaway detection device for a battery pack. Background Art

[0002] The existing thermal runaway detection devices mainly detect the concentration of gases such as hydrogen, VOC, carbon monoxide, carbon dioxide, etc. in the air, as well as the gas temperature and other information, and use the detection circuit module to determine whether thermal runaway has occurred in the battery pack. However, with the improvement of the degree of integration of batteries and circuits in the battery pack, the structure inside the battery pack is compact and the gas flow channel is narrow, which makes it difficult for the gas in the battery pack to flow. When the battery has thermal runaway, the detectable gas generated by the battery cannot be transmitted to the inside of the detection device in time, resulting in the inability of the detection device to issue an early warning.

[0003] The components used in the detection circuit module to detect hydrogen, VOC and other gases are electrochemical components, which have the characteristics of high sensitivity but short service life. Since the battery pack has strict sealing requirements for the interior, it is difficult to carry out later maintenance and replacement. The existing external detection devices need to be disassembled and the detection circuit module replaced during maintenance, which is complicated to operate. In addition, the detection circuit module has a large number of precision parts and electronic circuits, which are easy to cause damage and are of high value. Utility Model Content

[0004] In view of the technical problems in the prior art that battery pack detectors are inconvenient to repair and replace and have low sensitivity and slow response in detecting thermal runaway phenomena, the utility model provides an external composite thermal runaway detection device for a battery pack.

[0005] The utility model provides an external composite thermal runaway detection device for a battery pack, comprising: a battery pack frame, a battery pack is placed in the battery pack frame, and a first through hole is provided in the battery pack frame; a first fixing member, the first fixing member is provided with a first connecting portion capable of passing through the first through hole, the first fixing member is fixedly connected to the battery pack frame, and a second through hole is provided in the first fixing member that penetrates into the battery pack frame; a fan assembly, the fan assembly comprises a fan and a motor, the fan assembly is fixedly connected to the first fixing member and is arranged in the second through hole; a first sealing member, the first sealing member is arranged between the battery pack frame and the first fixing member; a second fixing member, the second fixing member is detachably connected to the first fixing member; a second sealing member, the second sealing member is arranged between the first fixing member and the second fixing member; a detection circuit module, the detection circuit module is arranged on a side of the fan assembly facing away from the battery pack frame, and the detection circuit module is fixedly connected in the first fixing member or in the second fixing member.

[0006] Furthermore, the first connection portion is connected to the second connection portion in a direction facing away from the battery pack frame, and the second connection portion is fixedly connected to the battery pack frame.

[0007] Furthermore, the second fixing member is provided with a limiting portion, and the second fixing member is fixedly connected to the battery pack frame.

[0008] Furthermore, the detection circuit module is fixedly connected to the first fixing member, and the detection circuit module is installed in the second through hole.

[0009] Furthermore, a detection circuit module is fixed to one end of the second fixing member facing the first fixing member, and a second through hole penetrating into the battery pack frame is opened in the first fixing member. When the first fixing member is fixedly connected to the second fixing member, the detection circuit module is located in the second through hole.

[0010] Furthermore, the detection circuit module is provided with one or more sensors selected from the group consisting of a CO sensor, a VOC sensor, a hydrogen sensor, a smoke sensor, and a temperature sensor.

[0011] Furthermore, the second fixing member is sealingly connected to a sealing connecting member, the sealing connecting member is provided with a sealing hole, and the wire connected to the detection circuit module passes through the sealing hole.

[0012] Furthermore, a nut is fixedly connected inside the battery pack frame, a bolt hole corresponding to the position of the nut is opened at a corresponding position of the first fixing member, and the first bolt passes through the bolt hole and is connected to the nut to fix the first fixing member to the battery pack frame.

[0013] Furthermore, the nut is fixed to the inner side of the battery pack frame by riveting or welding.

[0014] Furthermore, the first fixing member is provided with a threaded hole, the second fixing member is provided with a bolt mounting hole, and the second bolt passes through the bolt mounting hole and is installed in the threaded hole to fix the first fixing member and the second fixing member together.

[0015] The beneficial effects of the utility model are:

[0016] At present, most fire detection devices make judgments by detecting gas information such as the concentration of various gases, temperature and smoke in the air. Due to the difficulty of gas circulation, when a battery far away from the detector has thermal runaway, the gas information takes a longer time to reach the detector. The fan blades are driven by a motor to form a negative pressure area at the air vents of the lower shell, which accelerates the entry of external gas from the detector into the detector through the air vents, while enhancing the air circulation in the battery pack and improving the detection sensitivity and response speed.

[0017] The utility model does not need to install or disassemble the detection device from the inside of the battery pack frame, which facilitates the installation and disassembly operations. For later inspection and maintenance, the entire detector can be directly removed and replaced. There is no need to expose the expensive and easily damaged detection circuit module to the external environment, which avoids damage to the detection circuit module during the inspection and maintenance process, and improves the reliability of the detection circuit module.

[0018] The utility model adopts the first sealing member, the second sealing member and other components to detect the environment inside the battery pack frame, thereby maintaining the sealing of the environment inside the battery pack frame, preventing external factors from damaging the battery pack, protecting the battery pack from stable operation, and reducing the impact on the battery pack caused by detecting thermal runaway. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 It is a structural schematic diagram of an exploded view of an embodiment of the utility model;

[0021] Figure 2 It is a structural schematic diagram of an embodiment of the utility model;

[0022] Figure 3 It is a structural schematic diagram of an embodiment of the utility model;

[0023] Description of main reference numerals

[0024] 1-battery pack frame, 11-first through hole, 2-first fixing piece, 21-first connecting part, 211-second through hole, 22-second connecting part, 31-fan, 32-motor, 4-first sealing piece, 5-second fixing piece, 6-second sealing piece, 7-detection circuit module, 81-nut, 82-bolt hole, 83-first bolt, 91-threaded hole, 92-second bolt, 10-sealing connecting piece. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0026] The utility model provides an external composite thermal runaway detection device for a battery pack, comprising a battery pack frame 1, wherein a battery pack is installed inside the battery pack frame 1, and the battery pack frame 1 is provided with a first through hole 11; a first fixing member 2, wherein the first fixing member 2 is provided with a first connecting portion 21 capable of passing through the first through hole 11, the first fixing member 2 is fixedly connected to the battery pack frame 1, and a second through hole 211 penetrating into the battery pack frame 1 is provided in the first fixing member 2; a fan 31 assembly, wherein the fan 31 assembly comprises a fan 31 and a motor 32, and the fan 31 assembly is fixedly connected to the first fixing member 2 and arranged in the second through hole 211; a first sealing member 4, wherein the first sealing member 4 is arranged between the battery pack frame 1 and the first fixing member 2; a second fixing member 5, wherein the second fixing member 5 is detachably connected to the first fixing member 2; a second sealing member 6, wherein the second sealing member 6 is arranged between the first fixing member 2 and the second fixing member 5; and a detection circuit module 7, wherein the detection circuit module 7 is arranged on a side of the fan 31 assembly facing away from the battery pack frame 1, and the detection circuit module 7 is fixedly connected in the first sealing member 4 or in the second sealing member 6.

[0027] In one embodiment of the utility model, the first fixing member 2 includes a first connection portion 21 and a second connection portion 22, the first connection portion 21 passes through the first through hole 11, the second through hole 211 passes through the first connection portion 21, a portion of the first connection portion 21 is located inside the battery pack frame 1 or one end of the first connection portion 21 facing the battery pack frame 1 is flush with the inner side of the battery pack frame 1, the second through hole 211 is connected to the inner side of the battery pack, the second connection portion 22 is located outside the battery pack frame 1, the second connection portion 22 contacts the outer side of the battery pack frame 1, the area of ​​the second connection portion 22 contacting the outer side of the battery pack frame 1 is greater than the area of ​​the first through hole 11, and the second connection portion 22 plays a limiting role. In one embodiment, the first fixing member 2 can be inserted into the battery pack frame 1, and the second fixing member 5 is provided with a limiting portion fixedly connected to the battery pack frame 1 to play a limiting and fixing role.

[0028] In one embodiment of the utility model, the detection circuit module 7 is fixedly connected to the first fixing member 2, the detection circuit module 7 is installed in the second through hole 211, and the detection circuit module 7 is arranged on the side of the fan 31 assembly facing away from the battery pack frame 1. The fan 31 is driven to rotate by the motor 32. The rotation of the fan blades of the fan 31 sucks the air in the battery pack frame 1, that is, the battery pack, and blows it from the fan 31 to the detection circuit module 7. The detection circuit module 7 is provided with one or more sensors selected from the group consisting of a CO sensor, a VOC sensor, a hydrogen sensor, a smoke sensor, and a temperature sensor to monitor data such as CO, VOC, hydrogen, smoke, and temperature. Since the fan 31 sucks the gas from the battery pack, the flow of the gas in the battery pack is accelerated, and the air circulation in the battery pack is enhanced. Therefore, the data monitored by the detection circuit module 7 is more accurate, and can provide more accurate data that is more in line with the battery pack environment, and the response speed is faster. In another embodiment of the utility model, a detection circuit module 7 is fixed to one end of the second fixing member 5 facing the first fixing member 2, a second through hole 211 penetrating into the battery pack frame 1 is opened in the first fixing member 2, when the first fixing member 2 is fixedly connected to the second fixing member 5, the detection circuit module 7 is located in the second through hole 211, the detection circuit module 7 is arranged on the side of the fan 31 assembly facing away from the battery pack frame 1, the fan 31 is driven to rotate by the motor 32, the fan blades of the fan 31 rotate to suck the air in the battery pack frame 1, i.e., the battery pack, and blow it from the fan 31 to the detection circuit module 7, the detection circuit module 7 is provided with one or more sensors selected from the group consisting of a CO sensor, a VOC sensor, a hydrogen sensor, a smoke sensor, and a temperature sensor to monitor data such as CO, VOC, hydrogen, smoke, and temperature, because the fan 31 sucks the gas in the battery pack, accelerates the flow of the gas in the battery pack, and enhances the air circulation in the battery pack, so the data monitored by the detection circuit module 7 is more accurate, can provide more accurate data that is more in line with the battery pack environment, and has a faster response speed.

[0029] In one embodiment of the utility model, the second fixing member 5 is sealed and connected with a sealing connector 10. The sealing connector 10 is provided with a sealing hole. The wire connected to the detection circuit module 7 passes through the sealing hole. Due to the interference fit between the sealing connector 10 and the wire, a sealing effect is achieved. The sealing connector 10 is made of a sealing elastic material. The wire passes through the sealing connector and is used for the detection circuit module 7 to communicate with the outside and supply power.

[0030] In one embodiment of the utility model, a nut 81 is fixedly connected inside the battery pack frame 1. Preferably, the nut 81 is fixed to the inner side of the battery pack frame 1 by riveting or welding. A bolt hole 82 corresponding to the position of the nut 81 is opened at the corresponding position of the first fixing member 2. The first bolt 83 passes through the bolt hole 82 and is connected to the nut 81 to fix the first fixing member 2 to the battery pack frame 1. When disassembly is required, the first bolt 83 can be unscrewed to separate the first fixing member 2 and the battery pack frame 1, and the parts other than the battery pack frame 1 can be repaired or directly replaced. In one embodiment of the utility model, the first fixing member 2 is provided with a threaded hole 91, and the second fixing member 5 is provided with a bolt mounting hole. The second bolt 92 passes through the bolt mounting hole and is installed in the threaded hole 91 to fix the first fixing member 2 and the second fixing member 5. The first fixing member 2 and the second fixing member 5 can be separated by unscrewing the first bolt 83, and both repair and replacement are possible.

[0031] The utility model can realize installation and disassembly without the need for installation from the inside of the battery pack frame 1, which provides convenience for installation and disassembly operations. For later inspection and maintenance, the entire detector can be directly removed from the battery pack frame 1 for replacement. There is no need to expose the expensive and easily damaged detection circuit module 7 to the external environment, which avoids damage to the detection circuit module 7 during the inspection process and improves the reliability of the detection circuit module 7.

[0032] Although the present invention is described in detail by referring to the accompanying drawings and in combination with the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, a person skilled in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions shall be within the scope of the present invention. Any person skilled in the art who is familiar with the present technical field may easily think of changes or substitutions within the technical scope disclosed in the present invention, and these shall be within the scope of protection of the present invention.

Claims

1. An external composite thermal runaway detection device for a battery pack, characterized in that: include: A battery pack frame, in which a battery pack is placed, and the battery pack frame is provided with a first through hole; a first fixing member, the first fixing member is provided with a first connecting portion capable of passing through the first through hole, the first fixing member is fixedly connected to the battery pack frame, and the first fixing member is provided with a second through hole penetrating into the battery pack frame; A fan assembly, the fan assembly includes a fan and a motor, the fan assembly is fixedly connected to the first fixing member and is disposed in the second through hole; A first sealing member, the first sealing member is arranged between the battery pack frame and the first fixing member; a second fixing member, the second fixing member being detachably connected to the first fixing member; a second sealing member, the second sealing member being disposed between the first fixing member and the second fixing member; The detection circuit module is arranged on a side of the fan assembly facing away from the battery pack frame, and the detection circuit module is fixedly connected in the first fixing member or the second fixing member.

2. An external composite thermal runaway detection device for a battery pack as claimed in claim 1, characterized in that: The first connection portion is connected to the second connection portion in a direction facing away from the battery pack frame, and the second connection portion is fixedly connected to the battery pack frame.

3. The external composite thermal runaway detection device for a battery pack according to claim 1, characterized in that: The second fixing member is provided with a limiting portion, and the second fixing member is fixedly connected to the battery pack frame.

4. The external composite thermal runaway detection device for a battery pack according to claim 1, characterized in that: The detection circuit module is fixedly connected to the first fixing member, and the detection circuit module is installed in the second through hole.

5. The external composite thermal runaway detection device for a battery pack according to claim 1, characterized in that: A detection circuit module is fixed to one end of the second fixing member facing the first fixing member. A second through hole penetrating into the battery pack frame is opened in the first fixing member. When the first fixing member is fixedly connected to the second fixing member, the detection circuit module is located in the second through hole.

6. The external composite thermal runaway detection device for a battery pack according to claim 1, characterized in that: The detection circuit module is provided with one or more sensors selected from the group consisting of a CO sensor, a VOC sensor, a hydrogen sensor, a smoke sensor, and a temperature sensor.

7. The external composite thermal runaway detection device for a battery pack according to claim 1, characterized in that: The second fixing member is sealingly connected to a sealing connecting member, the sealing connecting member is provided with a sealing hole, and the wire connected to the detection circuit module passes through the sealing hole.

8. The external composite thermal runaway detection device for a battery pack according to claim 1, characterized in that: A nut is fixedly connected inside the battery pack frame, a bolt hole corresponding to the position of the nut is opened at a corresponding position of the first fixing member, and the first bolt passes through the bolt hole and is connected to the nut to fix the first fixing member to the battery pack frame.

9. An external composite thermal runaway detection device for a battery pack as claimed in claim 8, characterized in that: The nuts are fixed to the inside of the battery pack frame by riveting or welding.

10. An external composite thermal runaway detection device for a battery pack as claimed in claim 8, characterized in that: The first fixing member is provided with a threaded hole, the second fixing member is provided with a bolt installation hole, and the second bolt passes through the bolt installation hole and is installed in the threaded hole to fix the first fixing member and the second fixing member together.

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