Automatic smoke alarm battery pack assembly

Abstract

The utility model discloses an automatic smoke alarm battery pack assembly which comprises a shell and a battery module, and the shell is a rectangular frame with a hollow inner cavity; the device further comprises a transverse partition plate, a longitudinal breaking strip, a wiring harness groove and a smoke sensor. An inner cavity of the shell is divided into a plurality of module cavities by the transverse partition plates and the longitudinal breaking strips; a battery module is fixedly arranged in the module cavity; the wire harness groove penetrates through the transverse partition plate, wire guide holes leading to the module cavity are formed in the two sides of the wire harness groove, and wire harnesses of the battery module enter the wire harness groove through the wire guide holes and are arranged in the direction of the wire harness groove; the plurality of smoke sensors are arranged on the wiring harness grooves, and signal wiring harnesses of the smoke sensors are laid in the wiring harness grooves and are connected with the BMS master-slave machine. According to the utility model, the wiring harness groove is utilized to standardize the regular wiring of the related wiring harnesses of the battery module and the signal wiring harness of the smoke sensor, and the wiring harnesses are effectively protected.

Description

Technical Field

[0001] The utility model relates to an automatic smoke alarm battery pack assembly. Background Art

[0002] As an important core component of new energy vehicles, the battery pack may cause emergencies such as vehicle damage, fire, and even explosion in the case of thermal runaway. Therefore, the safety of new energy vehicle battery packs has received increasing attention. According to various new energy vehicle spontaneous combustion investigation reports and related research, the fire of electric vehicles is mainly caused by excessive temperature of the internal battery cells of the battery pack. When the battery pack undergoes thermal runaway, a large amount of pungent thick smoke will be generated, and then the thermal runaway of the battery pack will cause the fire to spread to the entire vehicle, seriously threatening people's lives and safety.

[0003] The utility model patent with the Chinese patent application number 201621090495.2 discloses a power battery pack that automatically detects and extinguishes fires, including a box body. Inside the box body, there are a battery module, a detection device, a fire extinguishing device, and a controller. The detection device includes at least one temperature sensor and at least one smoke sensor. The controller is respectively connected to the temperature sensor and the smoke sensor. The fire extinguishing device includes a fire extinguishing agent storage tank, a plurality of nozzles provided on the fire extinguishing agent storage tank, and solenoid valves on the nozzles. The solenoid valves are controlled by the controller. The nozzles are arranged facing both sides of the fire extinguishing agent storage tank, and the battery modules are arranged along both sides of the fire extinguishing agent storage tank. This power battery pack detects the occurrence of thermal runaway inside the battery pack through sensors, and then the controller opens the solenoid valves, and the fire extinguishing agent is sprayed into the power battery pack, so that the fire extinguishing agent quickly fills the box body to achieve the fire extinguishing effect. This patent sets the smoke sensor directly above the battery module, and the sensor signal wire harness is routed along the outside of the battery pack box body, and then the wire harness is extended into the battery pack and connected to the control signal wire harness; although the above design can avoid damaging the sensor signal wire harness during a fire and causing signal transmission obstacles, the routing of the sensor signal wire harness is complex, affecting the overall appearance of the entire battery pack, and the position of the sensor is fixed and cannot be adjusted according to the actual situation of the battery pack. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to provide an automatic smoke alarm battery pack assembly.

[0005] To solve the above technical problem, the technical solution adopted by the utility model is that the automatic smoke alarm battery pack assembly includes a housing and a battery module. The housing is a rectangular frame with a hollow inner cavity; it also includes a transverse partition, a longitudinal dividing strip, a wire harness groove, and a smoke sensor;

[0006] The transverse partition and the longitudinal dividing strip divide the inner cavity of the housing into several module cavities; the battery modules are fixedly arranged in the module cavities; the wire harness groove penetrates through the transverse partition, wire holes leading to the module cavities are arranged on both sides of the wire harness groove, and the wire harnesses of the battery modules enter the wire harness groove through the wire holes and are arranged along its direction;

[0007] A number of smoke sensors are arranged on the wire harness groove, and the signal wire harnesses of the smoke sensors are laid in the wire harness groove and connected to the BMS master-slave unit.

[0008] Preferably, the cross-section of the wire harness groove is an inverted U shape, a number of strip holes are arranged on the top surface of the wire harness groove, each strip hole is fixedly connected to a smoke sensor respectively, and the specific position of the smoke sensor in the strip hole is adjustable.

[0009] Preferably, it further includes an excitation fuse; the excitation fuse is fixed at the other end of the housing and is opposite to the BMS master-slave unit arranged at one end of the housing.

[0010] Further preferably, a positive BDU and a negative BDU are also arranged at one end of the housing, and the positive BDU and the negative BDU are respectively arranged on the left and right sides of the BMS master-slave unit.

[0011] Preferably, each module cavity is provided with a liquid cooling plate, and the liquid cooling plate is attached to the outer surface of the battery module.

[0012] Preferably, a square window is arranged on the transverse partition, a slot is arranged on the edge of the window, a flame retardant plate is inserted into the slot, and the area of the window of the transverse partition is blocked by the flame retardant plate.

[0013] As a further preference, medicine storage grooves are arranged on both sides of the flame retardant plate, and the medicine storage grooves are designed at the window of the transverse partition; a flame retardant is filled in the medicine storage grooves, and the medicine storage grooves are sealed with a thin film.

[0014] Even further preferably, the flame retardant is a powder-type flame retardant.

[0015] Preferably, the smoke sensor is a photoelectric smoke sensor.

[0016] The beneficial effects of the present utility model are:

[0017] The wire harness groove is used to standardize the regular routing of the wire harnesses related to the battery modules, and the signal wire harnesses of the smoke sensors can also be arranged inside the wire harness groove, which plays an effective role in protecting the wire harnesses. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present utility model will be further described in detail below in conjunction with the drawings and specific embodiments.

[0019] Figure 1 It is a three-dimensional structural schematic diagram of the automatic smoke alarm battery pack assembly of the present utility model;

[0020] Figure 2 Explosion structure schematic diagram of the automatic smoke alarm battery pack assembly of the present utility model;

[0021] Figure 3 Stereoscopic structure schematic diagram of the housing of the automatic smoke alarm battery pack assembly of the present utility model;

[0022] Figure 4 Stereoscopic structure schematic diagram of the wire harness groove of the automatic smoke alarm battery pack assembly of the present utility model;

[0023] Figure 5 Cross-sectional view of the flame retardant board of the automatic smoke alarm battery pack assembly of the present utility model.

[0024] Markings in the figure: 1 - housing, 2 - battery module, 3 - BMS master-slave unit, 4 - positive BDU, 5 - negative BDU, 6 - excitation fuse, 8 - transverse partition, 9 - longitudinal breaking strip, 10 - liquid cooling plate, 11 - wire harness groove, 111 - wire hole, 112 - strip hole, 12 - optoelectronic smoke sensor, 122 - fastening nut, 13 - flame retardant board, 131 - medicine storage tank, 132 - diaphragm. Specific embodiments

[0025] Figure 1 and Figure 2 is an automatic smoke alarm battery pack assembly. It is composed of a housing 1, a battery module 2, a BMS master-slave unit 3, a positive BDU 4, a negative BDU 5, an excitation fuse 6, a transverse partition 8, a longitudinal breaking strip 9, a wire harness groove 11, and a smoke sensor 12.

[0026] The housing 1 therein is a rectangular frame with a hollow inner cavity.

[0027] In Figure 3 , two transverse partitions and a longitudinal breaking strip are perpendicularly arranged in the inner cavity of the rectangular frame of the housing. The longitudinal breaking strip is arranged along the center line of the rectangular frame of the housing and intersects with the middle of the two transverse partitions, dividing the inner cavity of the housing into 6 module cavities for installing battery modules, and the battery modules are fixedly installed in the module cavities. The entire housing can exactly accommodate 6 battery modules.

[0028] The wire harness groove is arranged directly above the longitudinal breaking strip, in the same direction as the longitudinal breaking strip and penetrates through the two transverse partitions. At the same time, both ends of the wire harness groove reach both ends of the rectangular frame of the housing. Wire holes 111 leading to the module cavities are provided on both sides of the wire harness groove, and the wire harnesses of the battery modules enter the wire harness groove through the wire holes and are arranged along its direction.

[0029] Three smoke sensors are arranged at intervals on the wire harness groove, and the signal wire harnesses of the smoke sensors are laid in the wire harness groove and connected to the BMS master-slave unit fixed at one end of the housing.

[0030] The cross-section of the wire harness groove is an inverted U shape, and three strip holes 112 are provided on the top surface of the wire harness groove, and each strip hole is installed with a smoke sensor. The smoke sensor 12 is fixedly connected to the strip hole through a fastening nut 122, and the specific position of the smoke sensor on the strip hole can be adjusted along the strip hole( Figure 4 ). After the smoke sensor is fixed by the fastening nut, the sensor signal wire harness at the lower end of the smoke sensor can extend into the interior of the wire harness groove. Due to the certain length extensibility of the sensor signal wire harness, it can be neatly routed along the direction of the wire harness groove and connected to the BMS master-slave unit.

[0031] The BMS master-slave unit and the excitation fuse are respectively fixedly arranged at both ends of the housing, and the excitation fuse is fixed at the other end of the housing and opposite to the BMS master-slave unit.

[0032] A positive BDU and a negative BDU are respectively arranged on the left and right sides of the BMS master-slave unit.

[0033] During design, the excitation fuse and the BMS master-slave unit are both arranged at both ends of the longitudinal breaking strip, so that the excitation fuse and the BMS master-slave unit are both centered on the longitudinal center line of the rectangular frame of the housing, thereby facilitating the subsequent connection of the wire harness and ensuring the neatness of the wire harness.

[0034] The excitation fuse is a separate circuit protection device, which is fixed at the front end of the inner cavity of the housing. The BMS master-slave unit is a battery control unit, which is fixed at the rear end of the inner cavity of the housing. The positive BDU and the negative BDU are respectively used as the positive protection box and the negative protection box of the power battery, and are respectively arranged on the left and right sides of the BMS master-slave unit. The circuit connection relationship of the excitation fuse, as well as the circuit connection relationships between the BMS master-slave unit, the positive BDU, the negative BDU, etc., including the cooling pipeline connection method of the liquid cooling plate, all belong to the common knowledge in the art and will not be elaborated here.

[0035] A liquid cooling plate 10 is laid in each module cavity. When the battery module is fixed in the module cavity, the liquid cooling plate is in close contact with the lower surface of the battery module to achieve heat dissipation and temperature reduction of the battery module.

[0036] The smoke sensor can select various different forms of smoke sensors. The smoke sensor in this embodiment selects a photoelectric smoke sensor. The reason for selecting a photoelectric smoke sensor is that it has a lower cost compared with a radiation smoke sensor and there is no safety risk; at the same time, compared with a semiconductor smoke sensor, its static power consumption is lower and it is less affected by temperature.

[0037] Attention should be paid during installation. The installation position of the wire harness slot should be as low as possible below the upper surface of the battery module, so that the installation position of the smoke sensor is lower. When thick smoke appears due to thermal runaway of the battery module, its flue gas is transmitted downward. Therefore, setting the position of the smoke sensor lower helps to detect thermal runaway in advance. The smoke sensor will detect the presence of smoke in the first time and feedback it to the BMS master-slave unit in time, and then send an alarm to other modules of the new energy vehicle through the BMS master-slave unit 3.

[0038] In addition, a flame retardant board can be added to the transverse partition. Specifically, a square window is set on the transverse partition, and a slot is provided on the edge of the window. The flame retardant board 13 is inserted into the slot, and the flame retardant board exactly fills the entire area of the window of the transverse partition, so that the transverse partition has a certain flame retardant effect. The flame retardant board is used to effectively isolate and retard the fire between each module cavity. When a thermal runaway occurs in one of the battery modules, it is possible to avoid the battery modules in other module cavities being affected as much as possible.

[0039] In order to further improve the flame retardant efficiency, medicine storage grooves 131 for filling flame retardants can also be added on both sides of the flame retardant board( Figure 5 ). The medicine storage grooves must be exposed at the window of the transverse partition. The powder-type flame retardant is filled in the medicine storage grooves, and the flame retardant powder is sealed in the medicine storage grooves with a diaphragm 132. Once the battery module in the corresponding module cavity undergoes thermal runaway and heats up, the diaphragm of the medicine storage groove is immediately damaged at high temperature, so that the flame retardant powder in the medicine storage groove can leak out in time to prevent the continuous combustion of the battery module.

[0040] The embodiments of the present invention described above do not constitute a limitation to the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. Automatic smoke alarm battery pack assembly, including a housing and a battery module, characterized in that: The housing is a rectangular frame with a hollow inner cavity; it also includes a transverse partition, a longitudinal dividing strip, a wiring harness slot and a smoke sensor; The transverse partition and the longitudinal dividing strip divide the inner cavity of the shell into a plurality of module cavities; the battery module is fixedly arranged in the module cavity; the harness groove is arranged through the transverse partition, and wire holes leading to the module cavity are arranged on both sides of the harness groove, and the harness of the battery module enters the harness groove through the wire holes and is arranged along the direction thereof; A plurality of the smoke sensors are arranged on the harness slot, and the signal harness of the smoke sensor is laid in the harness slot and connected to the BMS master and slave machines.

2. The automatic smoke alarm battery pack assembly according to claim 1 is characterized in that: The cross section of the harness groove is an inverted U shape, and a plurality of strip holes are arranged on the top surface of the harness groove. Each strip hole is fixedly connected to a smoke sensor, and the specific position of the smoke sensor in the strip hole is adjustable.

3. The automatic smoke alarm battery pack assembly according to claim 1 is characterized in that: It also includes an excitation fuse; the excitation fuse is fixed at the other end of the shell and is opposite to the BMS master and slave machines arranged at one end of the shell.

4. The automatic smoke alarm battery pack assembly according to claim 3 is characterized in that: A positive BDU and a negative BDU are also disposed at one end of the shell, and the positive BDU and the negative BDU are respectively disposed on the left and right sides of the BMS master and slave.

5. The automatic smoke alarm battery pack assembly according to claim 1 is characterized in that: Each module cavity is paved with a liquid cooling plate, and the liquid cooling plate is attached to the outer surface of the battery module.

6. The automatic smoke alarm battery pack assembly according to claim 1, characterized in that: A square-frame window is arranged on the transverse partition plate, a slot is arranged on the edge of the window, a flame-retardant plate is inserted into the slot, and the window area of ​​the transverse partition plate is filled and blocked by the flame-retardant plate.

7. The automatic smoke alarm battery pack assembly according to claim 6, characterized in that: Drug storage tanks are arranged on both sides of the flame retardant plate, and the drug storage tanks are designed at the windows of the transverse partitions; the drug storage tanks are filled with flame retardants, and the drug storage tanks are sealed with films.

8. The automatic smoke alarm battery pack assembly according to claim 7 is characterized in that: The flame retardant is a powder type flame retardant.

9. The automatic smoke alarm battery pack assembly according to any one of claims 1 to 8, characterized in that: The smoke sensor is a photoelectric smoke sensor.

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