CN220357256U

CN220357256U - Battery pack and ponding monitoring device thereof

Info

Publication number: CN220357256U
Application number: CN202321373196.XU
Authority: CN
Inventors: 黄斐; 赵毅; 李正哲; 沙建荣; 李盘忠; 黄泰; 潘圣达; 昌淇正; 孟子能
Original assignee: Farasis Energy Zhenjiang Co Ltd
Current assignee: Farasis Energy Zhenjiang Co Ltd
Priority date: 2023-06-01
Filing date: 2023-06-01
Publication date: 2024-01-16
Anticipated expiration: 2033-06-01

Abstract

The application provides a battery package and ponding monitoring devices thereof, ponding monitoring devices include first casing, second casing and alarm trigger mechanism. The first shell is provided with a collecting structure and a water outlet channel, the collecting structure is used for collecting accumulated water, and the water outlet channel downwards penetrates through the first shell from the bottom of the collecting structure so as to downwards discharge the accumulated water collected by the collecting structure; the alarm triggering mechanism is positioned between the first shell and the second shell and comprises a first conductive part and a second conductive part, and a triggering open circuit positioned below the water outlet channel is formed between the first conductive part and the second conductive part; the second casing is connected with the first casing and the alarm triggering mechanism, and the second casing is used for being fixed inside the battery pack. When water accumulation is generated in the battery pack, the collecting mechanism collects the water accumulation, the collected water accumulation flows to the alarm triggering mechanism through the water outlet channel, the first conductive part and the second conductive part are electrically conducted, the triggering opening is electrically conducted, and an alarm signal is sent out. The ponding monitoring device does not need to be provided with a liquid level sensor, and the cost of the ponding monitoring device is reduced.

Description

Battery pack and ponding monitoring device thereof

Technical Field

The application relates to the field of batteries, in particular to a battery pack and a water accumulation monitoring device thereof.

Background

Along with the rapid development of lithium ion batteries, electric automobiles become a main riding tool for people to travel daily. However, as the seal of the battery pack ages, rainwater or water vapor inevitably enters the battery pack. The condensed water of rainwater or water vapor can cause water accumulation phenomenon in the battery pack; after ponding in the battery pack, the insulation function of part of the places can be weakened, and the insulation failure can be seriously caused, so that the safety of drivers and passengers is endangered.

The existing battery pack usually adopts a liquid level sensor to detect accumulated water, but the liquid level sensor is high in price and complex in working principle. The detection signal of the liquid level sensor needs to be compiled at the software end of the BMS (Battery management system ) and then calibrated. This process requires extensive testing, further increasing the cost of the final battery pack.

Therefore, how to provide a ponding monitoring device for replacing a liquid level sensor is a technical problem which needs to be solved by the person skilled in the art.

Disclosure of Invention

The application aims at solving at least one of the technical problems existing in the prior art, and provides a battery pack and a ponding monitoring device thereof, which are electrically conducted by triggering an open circuit through ponding so as to realize ponding monitoring.

In order to achieve the purpose of the application, the water accumulation monitoring device is applied to a battery pack and comprises a first shell, a second shell and an alarm triggering mechanism,

the first shell is provided with a collecting structure and a water outlet channel, the collecting structure is used for collecting accumulated water, and the water outlet channel downwards penetrates through the first shell from the bottom of the collecting structure so as to downwards discharge the accumulated water collected by the collecting structure;

the alarm triggering mechanism is positioned between the first shell and the second shell, comprises a first conductive part and a second conductive part, and forms a triggering open circuit positioned below the water outlet channel between the first conductive part and the second conductive part, and the first conductive part and the second conductive part of the triggering open circuit can be conducted by accumulated water discharged by the water outlet channel and send out an alarm signal when being conducted;

the second shell is connected with the first shell and the alarm triggering mechanism, and the second shell is used for being fixed inside the battery pack.

In some embodiments, the alarm triggering mechanism further comprises a connection part, the first conductive part and the second conductive part are electrically connected with the connection part, the connection part is further used for being connected with a battery management system of a battery pack, and when the triggering open circuit is conducted, the connection part can transmit the alarm signal to the battery management system.

In some embodiments, the alarm triggering mechanism further comprises a detection resistor connected in parallel with the trigger open circuit, the detection resistor being shorted when the trigger open circuit is turned on to generate the alarm signal.

In some embodiments, the detection resistor is a thermistor that is also used to detect a temperature condition within the battery pack.

In some embodiments, the alarm triggering mechanism further comprises a mounting plate, the first conductive portion, the second conductive portion, the detection resistor and the connection portion are all arranged on the mounting plate, the mounting plate is further provided with a water outlet penetrating in the thickness direction, the water outlet extends in the direction parallel to the connecting line of the first conductive portion and the second conductive portion, and the water outlet is arranged on at least one side of the connecting line of the first conductive portion and the second conductive portion and is used for discharging accumulated water.

In some embodiments, the collecting structure is a collecting tank arranged on the upper surface of the first shell, and the water outlet channel is located in the middle of the collecting tank.

In some embodiments, the distance between the bottom of the collecting tank and the upper surface of the first housing increases gradually in a direction approaching the water outlet passage.

In some embodiments, the second housing has a connection tab for fixedly connecting with the outer shell of the battery pack.

The application also provides a battery pack, including shell and above-mentioned arbitrary ponding monitoring devices, ponding monitoring devices set up in the bottom surface of shell is used for the monitoring whether there is ponding in the shell.

In some embodiments, the number of the ponding monitoring devices is plural, and each ponding monitoring device is distributed on the bottom surface of the housing.

The application has the following beneficial effects:

the ponding monitoring device is applied to a battery pack and comprises a first shell, a second shell and an alarm triggering mechanism, wherein the first shell is provided with a collecting structure and a water outlet channel, the collecting structure is used for collecting ponding, and the water outlet channel downwards penetrates through the first shell from the bottom of the collecting structure so as to downwards discharge the ponding collected by the collecting structure; the alarm triggering mechanism is positioned between the first shell and the second shell, comprises a first conductive part and a second conductive part, forms a triggering open circuit positioned below the water outlet channel between the first conductive part and the second conductive part, and can be conducted by accumulated water discharged by the water outlet channel and send out an alarm signal when the accumulated water is conducted; the second casing is connected with the first casing and the alarm triggering mechanism, and the second casing is used for being fixed inside the battery pack.

When ponding is generated in the battery pack, the ponding is collected by the collecting mechanism, the collected ponding passes through the water outlet channel and flows to the alarm triggering mechanism, the first conductive part and the second conductive part are electrically conducted, the triggering opening is electrically conducted, and an alarm signal is sent out. The ponding monitoring device does not need to be provided with a liquid level sensor, so that the calibration operation is omitted, and the cost of the ponding monitoring device is reduced.

The application also provides a battery pack which comprises the ponding monitoring device and has the advantages.

Drawings

FIG. 1 is an exploded view of a water accumulation monitoring device according to one embodiment of the present application;

FIG. 2 is a schematic diagram of the alarm triggering mechanism in FIG. 1;

FIG. 3 is a top view of the upper housing of FIG. 1;

FIG. 4 is a cross-sectional view of A-A of FIG. 3;

FIG. 5 is a circuit diagram of the alert trigger mechanism of FIG. 2;

fig. 6 is a schematic structural view of a case of a battery pack according to an embodiment of the present application.

Wherein reference numerals in fig. 1 to 6 are:

1. a first housing; 2. an alarm triggering mechanism; 3. a second housing; 4. a battery management system; 5. a housing; 11. a collection tank; 12. a water outlet channel; 13. a through hole; 21. a mounting plate; 22. a connector; 23. a first bonding pad; 24. a second bonding pad; 25. a thermistor; 26. and a water outlet.

Detailed Description

In order to better understand the technical solutions of the present application, the following describes in detail the battery pack and the water accumulation monitoring device thereof provided in the present application with reference to the accompanying drawings.

The ponding monitoring device is applied to the battery package. The ponding monitoring device comprises a first shell 1, a second shell 3 and an alarm triggering mechanism 2. As shown in fig. 1, the first housing 1 is provided with a collecting structure and a water outlet channel 12. Specifically, ponding monitoring devices can set up in the bottom of battery package, and ponding that produces in the shell 5 of battery package can flow to the bottom at first, and collection structure is used for collecting ponding. The water outlet channel 12 penetrates through the first shell 1 downwards from the bottom of the collecting structure, accumulated water collected by the collecting structure can be discharged downwards along the water outlet channel 12, the alarm triggering mechanism 2 is located below the first shell 1, and the accumulated water flows onto the alarm triggering mechanism 2 along the water outlet channel 12.

As shown in fig. 1, the alarm triggering mechanism 2 is located between the first housing 1 and the second housing 3. The alarm triggering mechanism 2 comprises a first conductive part and a second conductive part which are arranged at intervals. The first conductive part and the second conductive part can be respectively connected with the positive electrode and the negative electrode of the power supply, and potential difference exists between the first conductive part and the second conductive part, and the first conductive part and the second conductive part are matched to form a trigger open circuit. A gap between the first conductive portion and the second conductive portion is located below the water outlet passage 12. When the accumulated water flows to the alarm triggering mechanism 2, the accumulated water first falls between the first conductive part and the second conductive part. As the accumulated water gradually increases and finally contacts the first conductive part and the second conductive part, the first conductive part and the second conductive part are electrically conducted. At this time, the open circuit is triggered to form a closed loop, and an alarm signal is sent out.

The second housing 3 may be adapted for fixed connection with the outer shell 5 of the battery pack. The first casing 1 can be fixedly connected with the second casing 3 through a bolt connection mode, an adhesive bonding mode and the like, and meanwhile, the first casing and the second casing can fix the alarm triggering mechanism 2.

In this embodiment, the ponding monitoring device collects ponding through the collection structure to guide ponding to trigger the open circuit through the water outlet channel 12, trigger the first conductive part and the second conductive part of open circuit and form closed circuit after being led by ponding electricity, and then send alarm signal. The ponding monitoring device has a simple structure, can complete ponding monitoring without setting a liquid level sensor, and further reduces the cost of the battery pack. And the ponding monitoring device does not need to be calibrated before use, so that the calibration cost is saved, and the cost of the battery pack is further reduced.

In some embodiments, the alarm triggering mechanism 2 further includes a connection portion, as shown in fig. 2 and 3, which may be embodied as a connector 22, the connector 22 being configured to connect to the battery management system 4 of the battery pack, the battery management system 4 being configured to provide power to the water logging device via the connector 22 as a power source. The first conductive portion and the second conductive portion are each electrically connected to the connector 22. Specifically, the connector 22 includes a high-potential connector 22 and a low-potential connector 22, between which a potential difference exists, and the first conductive portion and the second conductive portion may be connected to the high-potential connector 22 and the low-potential connector 22, respectively. When the first and second conductive portions are conducted by the water, the open circuit is triggered to generate an alarm signal, and the connector 22 is capable of transmitting the alarm signal to the battery management system 4. The battery management system 4 can be connected with an alarm device, and after receiving the alarm signal, the battery management system 4 controls the alarm device to give an alarm to prompt accumulated water in the battery pack. The structure of the connector 22 is referred to in the prior art, and will not be described herein. The alarm triggering mechanism 2 generates an alarm signal through the electric conduction of the first conductive part and the second conductive part, and has simple structure and low manufacturing cost. The connection part can also be a wire specifically, and the alarm triggering mechanism 2 is connected with the battery management system 4 through the connector 22, so that the stability of connection can be improved.

Optionally, the alarm triggering mechanism 2 further includes a detection resistor, as shown in fig. 3, where the detection resistor is connected in parallel with the triggering open circuit, that is, two ends of the detection resistor are respectively connected with the high-potential connector 22 and the low-potential connector 22. When the trigger open circuit is not conducted by the accumulated water, the current passes through the detection resistor. The sense resistor may be embodied as a constant value resistor, the resistance of which is known, and the current through the sense resistor is also a determined value. When the trigger open circuit is not conducted by the accumulated water, the detection resistor is triggered to open and short circuit, the resistance value of the alarm trigger mechanism 2 and the current value passing through the alarm trigger mechanism 2 change, and an alarm signal is generated. The battery management system 4 can carry out ponding alarm after detecting the resistance value or the current change.

In some embodiments, the detection resistor may be embodied as a thermistor 25. The resistance of the thermistor 25 may vary with temperature, and the voltage applied across the thermistor 25 may be approximately constant, so that the current through the thermistor 25 may be affected by the temperature within the battery pack. The thermistor 25 is electrically connected to the battery management system 4, and the battery management system 4 can determine the temperature condition within the battery pack based on the resistance value through the thermistor 25 or the current through the thermistor 25. The battery management system 4 can discover that the temperature in the battery pack is too high through the thermosensitive electromechanical group and timely send out high-temperature alarm, so that accidents such as spontaneous combustion and the like of the battery pack are avoided. When the trigger open circuit is turned on by the accumulated water, the thermistor 25 is triggered to open and short, and the alarm trigger mechanism 2 generates an alarm signal.

Optionally, the alarm triggering mechanism 2 further includes a mounting plate 21, and the first conductive portion, the second conductive portion, the detection resistor, and the connector 22 are disposed on a side of the mounting plate 21 close to the first housing 1. The mounting plate 21 is fixed between the second housing 3 and the first housing 1, and the first housing 1 is connected with the second housing 3, so that the alarm triggering mechanism 2 can be enclosed in the housing. Specifically, the mounting plate 21 is rectangular, and has 4 fixing holes that are rectangular distribution, and one side that second casing 3 is close to first casing 1 is equipped with 4 fixed columns, and the fixed column one-to-one penetrates in the fixing hole, through interference fit or mode fixed connection such as riveting with mounting plate 21 and second casing 3. A containing cavity is formed between the first shell 1 and the second shell 3, the mounting plate 21 is positioned in the containing cavity, and the side walls of the first shell 1 and the second shell 3 can seal the containing cavity to play a role in protecting the alarm triggering mechanism 2. The mounting board 21 may refer to a PCB in the prior art, and will not be described herein.

Alternatively, as shown in fig. 2, the first conductive part is a first bonding pad 23 welded on the mounting plate 21, the second conductive part is a second bonding pad 24 welded on the mounting plate 21, and the first bonding pad 23 and the second bonding pad 24 are spaced apart, and the interval between the first bonding pad 23 and the second bonding pad 24 is located below the water outlet channel 12 of the first housing 1. The first pad 23 and the second pad 24 are made of a conductive material such as copper, aluminum, stainless steel, or the like. Of course, the user may use a conductive column, a conductive block, or the like as the conductive portion, which is not limited herein.

Alternatively, the first housing 1 has the through hole 13 corresponding to the position of the connector 22, and the connector 22 is disposed perpendicular to the mounting plate 21 and extends to the outside of the first housing 1 through the through hole 13. The connector 22 can be connected with the battery management system 4 in a plugging manner, so that the connection difficulty of the connector and the battery management system 4 is reduced, and the connection firmness of the connector and the battery management system is improved.

In some embodiments, the collecting structure is a collecting tank 11 disposed on the upper surface of the first housing 1, the bottom of the collecting tank 11 is low, and the accumulated water can flow into the collecting tank 11 along the surface of the first housing 1 and accumulate in the collecting tank 11. The water outlet passage 12 is located at the middle of the collecting tank 11, and the water outlet passage 12 penetrates the bottom of the collecting tank 11 in a direction perpendicular to the upper surface of the first housing 1. The accumulated water in the collecting tank 11 gradually increases, and the accumulated water can pass through the water outlet channel 12 under the action of gravity and drop between the first bonding pad 23 and the second bonding pad 24.

Alternatively, as shown in fig. 5, the distance between the bottom of the collecting tank 11 and the upper surface of the first housing 1 gradually increases in a direction approaching the water outlet passage 12, i.e., the height of the bottom of the collecting tank 11 gradually decreases in a direction approaching the water outlet passage 12. The bottom of the collecting tank 11 can play a role in guiding water, so that accumulated water is guided to flow to the water outlet channel 12, and a small amount of accumulated water can drop onto the alarm triggering mechanism 2 along the water outlet channel 12. The ponding monitoring device discovers that the ponding monitoring device exists when ponding is less, improves the sensitivity of monitoring, and reduces the risk caused by ponding.

Alternatively, as shown in fig. 5, the lower surface of the first housing 1 is further provided with guide portions located at both sides of the water outlet passage 12 and extending downward from the lower surface of the first housing 1. The guide portion can reduce the surface tension of the accumulated water at the lower end of the water outlet channel 12, so that the accumulated water can flow downwards along the guide portion, and the accumulated water is promoted to drop to the alarm triggering mechanism 2.

Optionally, as shown in fig. 4 and 5, the collecting tank 11 further has a baffle plate therein, and the baffle plate is located above the water outlet channel 12. The battery pack can be applied to an electric automobile, jolt is often generated in the running process of the electric automobile, and accumulated water in the water outlet channel 12 can fly out from the upper side of the water outlet channel 12 due to jolt. The baffle can block the ponding that splashes, avoids ponding to splash to battery or battery management system 4, avoids the battery package to take place circuit failure because of ponding.

In some embodiments, the mounting plate 21 is further provided with water discharge openings 26 penetrating in the thickness direction, and as shown in fig. 2, the number of water discharge openings 26 is two. The first land 23 and the second land 24 are spaced apart, and the drain openings 26 are arranged in a direction parallel to the line connecting the first land 23 and the second land 24, with the first land 23 and the second land 24 being located between 2 drain openings 26. The ponding that falls on mounting panel 21 can switch on first pad 23 and second pad 24, and unnecessary ponding can be discharged from 2 outlet 26, avoids ponding to accumulate on mounting panel 21, causes connector 22 corruption.

Optionally, the length of the drain opening 26 is greater than the distance between the first bonding pad 23 and the second bonding pad 24, and the drain opening 26 corresponds to the interval between the first bonding pad 23 and the second bonding pad 24, so that the water can flow into the drain opening 26 when flowing to the two sides of the interval, and the water can be prevented from freely flowing along the mounting plate.

Optionally, the second housing 3 has a connecting lug, as shown in fig. 1, where the second housing 3 is rectangular, and the connecting lugs are located on two opposite outer sidewalls of the second housing 3. The connecting lug is provided with a connecting hole which penetrates through the connecting lug, and the connecting lug can be fixedly connected with the shell 5 of the battery pack through bolts.

The application also provides a battery pack, which comprises a battery, a battery management system 4, a shell 5 and the ponding monitoring device in any embodiment. The battery, the battery management system 4 and the water accumulation monitoring device are all arranged in the shell 5. Specifically, the ponding monitoring device is arranged on the bottom surface of the shell 5. The ponding that produces in the shell 5 can flow into ponding monitoring devices, and ponding monitoring devices detects ponding and sends alarm signal to battery management system 4 back, and battery management system 4 sends ponding warning according to alarm signal.

Optionally, the area of the bottom surface of the housing 5 is larger, so as to improve the accuracy of water accumulation detection, the number of the water accumulation monitoring devices may be multiple (in fig. 5, 1 water accumulation monitoring device is used as an example for illustration), and each water accumulation monitoring device is distributed on the bottom surface of the housing 5 to perform multipoint monitoring on the bottom surface of the housing 5. The distribution mode of the ponding monitoring devices can be matrix distribution or can be distributed according to the distribution mode of the batteries, and the distribution mode is not limited herein.

Optionally, the bottom surface of the housing 5 may be provided with a mounting groove, and the water accumulation monitoring device may be disposed in the mounting groove, and the upper surface portion of the first housing 1 is not higher than the top of the mounting groove. The mounting groove is concavely arranged on the bottom surface of the shell 5, and accumulated water can flow into the mounting groove at first, so that the accumulated water is prevented from contacting with the battery or the battery management system 4. The ponding monitoring devices are lower in height in the shell 5, and before ponding is higher than the bottom surface of the mounting groove, the ponding monitoring devices can detect existence of ponding, and then accuracy of detection is improved, ponding in the battery pack can be found in time, and harm caused by ponding is reduced.

It is to be understood that the above embodiments are merely illustrative of the exemplary embodiments employed to illustrate the principles of the present application, however, the present application is not limited thereto. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the application, and are also considered to be within the scope of the application.

Claims

1. The ponding monitoring device is applied to a battery pack and is characterized by comprising a first shell, a second shell and an alarm triggering mechanism, wherein,

2. The water logging monitoring device of claim 1 wherein the alarm triggering mechanism further comprises a connection portion, the first conductive portion and the second conductive portion each being electrically connected to the connection portion, the connection portion further being configured to connect to a battery management system of a battery pack, the connection portion being configured to transmit the alarm signal to the battery management system when the trigger is open-circuited.

3. The water accumulation monitoring device in accordance with claim 2 wherein the alarm triggering mechanism further comprises a detection resistor connected in parallel with the trigger open circuit, the detection resistor being shorted when the trigger open circuit is conductive to generate the alarm signal.

4. The water accumulation monitoring device in accordance with claim 3 wherein the sensing resistor is a thermistor, the thermistor further configured to sense a temperature condition within the battery pack.

5. The water accumulation monitoring device as in claim 3 wherein the alarm triggering mechanism further comprises a mounting plate, the first conductive portion, the second conductive portion, the detection resistor and the connection portion are all disposed on the mounting plate, the mounting plate is further provided with a drain opening penetrating in a thickness direction, the drain opening extends in a direction parallel to a line connecting the first conductive portion and the second conductive portion, and the drain opening is disposed on at least one side of the line connecting the first conductive portion and the second conductive portion for draining water accumulation.

6. The apparatus according to any one of claims 1 to 5, wherein the collection structure is a collection tank provided on an upper surface of the first housing, and the water outlet passage is located in a middle portion of the collection tank.

7. The water accumulation monitoring device in accordance with claim 6, wherein a distance between a bottom of the collecting tank and an upper surface of the first housing gradually increases in a direction approaching the water outlet passage.

8. The water accumulation monitoring device in accordance with any one of claims 1 to 5 wherein the second housing has a connection lug for fixedly connecting with the housing of the battery pack.

9. A battery pack comprising a housing and the water accumulation monitoring device according to any one of claims 1 to 8, wherein the water accumulation monitoring device is arranged on the bottom surface of the housing and is used for monitoring whether water accumulation exists in the housing.

10. The battery pack of claim 9, wherein the number of water accumulation monitoring devices is plural, and each water accumulation monitoring device is distributed on the bottom surface of the housing.