CN220585371U

CN220585371U - Battery pack

Info

Publication number: CN220585371U
Application number: CN202321370943.4U
Authority: CN
Inventors: 郭志杰; 吕彬彬; 张道红; 郭佳明
Original assignee: Shanghai Sigeyuan Intelligent Technology Co ltd
Current assignee: Shanghai Sigeyuan Intelligent Technology Co ltd
Priority date: 2023-05-31
Filing date: 2023-05-31
Publication date: 2024-03-12
Anticipated expiration: 2033-05-31

Abstract

The utility model provides a battery pack, and belongs to the technical field of energy storage devices. The battery pack comprises a shell, wherein an installation space is formed in the shell, a separation structure is arranged in the installation space, the separation structure separates the installation space into at least two installation cavities, and a battery cell module is arranged in each installation cavity; the fire extinguishing agent is filled in the accommodating cavity, an opening valve is arranged on the accommodating cavity corresponding to the adjacent mounting cavity, and when the opening valve is opened, the accommodating cavity is communicated with the mounting cavity corresponding to the opening valve through the opening valve. When parameters such as temperature, pressure and the like in the battery pack exceed preset standard values, the opening valve can be opened, the accommodating cavity is communicated with the mounting cavity, and the fire extinguishing agent in the accommodating cavity enters the mounting cavity to extinguish and cool the mounting cavity. Because the holding cavity is arranged in the separation structure, independent arrangement is not needed, the space utilization rate of the inside of the battery pack shell is improved, and the improvement of the total electric quantity and the energy density of the battery pack is facilitated.

Description

Battery pack

Technical Field

The utility model belongs to the technical field of energy storage devices, and particularly relates to a battery pack.

Background

In the field of electric automobiles and the like, a battery pack is used as a power supply device for supplying power to a power utilization device such as a motor and the like. The battery pack generally includes a case and a battery module disposed in the case. In order to ensure sufficient electric quantity, a plurality of battery modules are usually arranged in the shell, and a plurality of electric cores are arranged in the battery modules. The battery core can generate a large amount of heat in the use and charge-discharge processes, so that the battery is raised, and after the temperature of the battery is too high, the battery can possibly be ignited and exploded. As the number of battery cells increases, and under the influence of vibration and possible collision of the electric vehicle during running, the safety risk of the battery pack increases accordingly. Therefore, in the current battery pack, a fire extinguishing device is generally arranged, and when the temperature of the battery is too high or a fire occurs, the fire extinguishing device extinguishes and cools the interior of the battery pack. In the prior art, fire extinguishing devices are generally arranged in a shell of a battery pack, the space inside the shell of the battery pack is limited, and the battery modules are required to be installed as much as possible, so that the total electric quantity of the battery pack is improved, and the energy density of the battery pack is increased. The fire extinguishing device is independently arranged in the shell, so that a large amount of space is occupied, the total electric quantity of the battery pack is reduced, and the energy density of the battery pack is reduced

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, an object of the present utility model is to provide a battery pack for solving the problems of reduced total power and reduced energy density of the battery pack caused by the separate arrangement of the fire extinguishing device in the prior art.

To achieve the above and other related objects, the present utility model provides a battery pack, including a housing having an installation space therein, a partition structure provided in the installation space, the partition structure partitioning the installation space into at least two installation cavities, and a battery cell module provided in the installation cavity;

the fire extinguishing device is characterized in that a containing cavity is arranged in the separation structure, fire extinguishing agents are filled in the containing cavity, an opening valve is arranged on the containing cavity corresponding to the adjacent installation cavity, and when the opening valve is opened, the containing cavity is communicated with the installation cavity corresponding to the opening valve through the opening valve.

Optionally, the battery pack further comprises a controller and fault sensors arranged in the mounting cavity, and the controller is respectively connected with the opening valves and the fault sensors in a signal mode.

Optionally, the fault sensor is a temperature sensor and/or a pressure sensor.

Optionally, an explosion-proof valve is opened on the housing corresponding to the installation cavity, and when the explosion-proof valve is opened, the installation cavity is communicated with the outside of the housing.

Optionally, the explosion-proof valve is in signal connection with the controller.

Optionally, the separation structure comprises two partition boards arranged side by side, the partition boards are connected with the inner wall of the shell, and the accommodating cavity is formed between the two partition boards.

Optionally, the opening valve is disposed on the partition plate.

Optionally, the partition board is made of a heat conducting material.

Optionally, an insulating layer is disposed on a side of the partition corresponding to the mounting cavity.

Optionally, the fire extinguishing agent is perfluorinated hexanone.

As described above, the battery pack of the present utility model has the following advantageous effects: because the separation structure is internally provided with the accommodating cavity and the opening valve, the accommodating cavity is filled with the fire extinguishing agent. When parameters such as temperature, pressure in the battery package surpass preset's standard value, the opening valve can be opened, makes hold chamber and installation cavity intercommunication, holds the fire extinguishing agent in the chamber and gets into the installation cavity in, puts out a fire the cooling to the installation cavity. Because the holding cavity is arranged in the separation structure, independent arrangement is not needed, the space utilization rate of the inside of the battery pack shell is improved, and the improvement of the total electric quantity and the energy density of the battery pack is facilitated.

Drawings

FIG. 1 is a schematic view of a lower case in an embodiment of the present utility model;

fig. 2 is a schematic structural diagram of a lower case provided with a cell stack in an embodiment of the present utility model;

fig. 3 is a schematic cross-sectional view of a battery pack according to an embodiment of the present utility model;

fig. 4 is a schematic diagram illustrating connection of a controller according to an embodiment of the utility model.

Reference numerals illustrate: cover plate 1, lower box 2, battery stack 3, installation chamber 4, holding chamber 5, opening valve 6, explosion-proof valve 7, baffle 8, strengthening rib 9.

Detailed Description

Further advantages and effects of the present utility model will become apparent to those skilled in the art from the disclosure of the present utility model, which is described by the following specific examples.

It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the utility model to the extent that it can be practiced, since modifications, changes in the proportions, or otherwise, used in the practice of the utility model, are not intended to be critical to the essential characteristics of the utility model, but are intended to fall within the spirit and scope of the utility model. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the utility model, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the utility model may be practiced.

Referring to fig. 1 to 3, the present utility model provides a battery pack, which includes a housing, wherein an installation space is provided in the housing, a separation structure is provided in the installation space, the separation structure separates the installation space into at least two installation cavities 4, and a battery cell module is provided in the installation cavities 4.

The separation structure is internally provided with a containing cavity 5, fire extinguishing agent is filled in the containing cavity 5, an opening valve 6 is arranged on the containing cavity 5 corresponding to the adjacent installation cavity 4, and when the opening valve 6 is opened, the containing cavity 5 is communicated with the installation cavity 4 corresponding to the opening valve 6 through the opening valve 6. Specifically, in this embodiment, the housing includes a lower case 2 and a cover plate 1 covered in the lower case 2, and a space enclosed by the cover plate 1 and the lower case 2 is an installation space.

When parameters such as temperature, pressure in the battery pack exceed preset standard values, the opening valve 6 can be opened, so that the accommodating cavity 5 is communicated with the mounting cavity 4, and the fire extinguishing agent in the accommodating cavity 5 enters the mounting cavity 4 to extinguish fire and cool the mounting cavity 4. Because the holding cavity is arranged in the separation structure, independent arrangement is not needed, the space utilization rate of the inside of the battery pack shell is improved, and the improvement of the total electric quantity and the energy density of the battery pack is facilitated.

Specifically, as shown in fig. 2 and 3, in this embodiment, the partition structure includes two partition boards 8 arranged side by side, the partition boards 8 are connected to the inner wall of the housing, and the accommodating chamber 5 is formed between the two partition boards 8. The partition 8 plays a role in separating the installation space in the housing and, at the same time, also plays a role in supporting the inner wall of the housing. Specifically, in the present embodiment, the opening valve 6 is provided on the partition 8.

In this embodiment, the partition 8 is made of a heat conductive material such as aluminum. The heat conduction material has high heat conductivity coefficient, is favorable for transmitting heat in the shell to the shell through the partition plate 8, and dissipates heat by the shell, so that heat accumulation in the battery pack is reduced.

In this embodiment, the spacer 8 is provided with an insulating layer on the side corresponding to the mounting chamber 4. The insulating layer plays the insulating effect, is favorable to promoting the insulating properties of baffle 8, avoids electric core module to pass through baffle 8 electric leakage.

As shown in fig. 3, in the present embodiment, the partition plate 8 is provided with a reinforcing rib 9 on the side facing the accommodation chamber 5, the reinforcing rib 9 being provided along the length direction of the partition plate 8. The strengthening rib 9 can increase the baffle 8 at length direction's intensity to reinforcing baffle 8 is to shells inner wall's supporting effect, and strengthening rib 9 occupies smallly simultaneously, holds more fire extinguishing agent in the chamber 5 in the advantage holds.

In this embodiment, the number of the partition structures is 1, and in other embodiments, the number of the partition structures may be plural, and the plural partition structures partition the installation space inside the housing into the plural installation cavities 4.

As shown in fig. 4, the battery pack in this embodiment further includes a controller and fault sensors disposed in the installation cavity 4, where the controller is respectively connected with each of the opening valves 6 and each of the fault sensors, and the controller can control the opening and closing of the opening valves 6 according to the detection results of the fault sensors.

In some embodiments, the fault sensor is a temperature sensor, and the controller compares the detected temperature with a preset safety temperature threshold by detecting the temperature in the battery pack, and when the temperature detected by the fault sensor exceeds the safety temperature threshold, the controller can determine that the battery pack has a safety risk. In other embodiments, the fault sensor is a pressure sensor, and the controller compares the detected pressure with a preset safety pressure threshold by detecting the pressure in the battery pack, and when the pressure detected by the fault sensor exceeds the safety pressure threshold, the controller can determine that the battery pack has a safety risk.

In this embodiment, the fault sensor is composed of a temperature sensor and a pressure sensor, and can detect the temperature and the pressure in the battery pack at the same time. The safety risk of the battery pack can be judged when the temperature detected by the fault sensor exceeds a safety temperature threshold value, and the safety risk of the battery pack can be judged when the detected pressure exceeds a safety pressure threshold value. And when the temperature detected by the fault sensor exceeds a safety temperature threshold value and the detected pressure exceeds a safety pressure threshold value, judging that the battery pack has safety risk. The specific judgment logic is reasonably adjusted according to actual conditions. The fault sensor detects the temperature and the pressure in the battery pack simultaneously, so that the sensitivity and the accuracy of fault detection can be improved, and the fault detection effect is improved.

In this embodiment, the housing is provided with an explosion-proof valve 7 corresponding to the installation cavity 4, and when the explosion-proof valve 7 is opened, the installation cavity 4 communicates with the outside of the housing. The explosion-proof valve 7 is used for releasing pressure in the shell, when the pressure in the installation cavity 4 exceeds a preset safety threshold, the explosion-proof valve 7 can be opened, the pressure in the shell is removed, and explosion of the battery pack due to overlarge pressure of the shell is prevented. As shown in fig. 4, in the present embodiment, the controller is also connected to the explosion-proof valve 7 in a signal manner, so that the controller can also control the opening and closing of the explosion-proof valve 7.

In this embodiment, the fire extinguishing agent is a low boiling point fire extinguishing agent such as perfluoro-hexanone, and when the fire extinguishing agent enters the installation cavity 4, the fire extinguishing agent is vaporized to absorb a large amount of heat, so as to perform the functions of extinguishing fire and reducing temperature. In this embodiment, the pressure generated after the fire extinguishing agent enters the installation cavity 4 is greater than the pressure of the explosion-proof valve 7. Therefore, after the fire extinguishing agent enters the installation cavity 4, the explosion-proof valve 7 can be opened to release pressure to the battery pack in advance, so that the safety performance of the battery pack is improved. The pressure generated after the fire extinguishing agent enters the installation cavity 4 can be reasonably selected according to the actual situation, and the fire extinguishing agent can be controlled by changing the parameters of the opening valve 6, the filling quantity of the fire extinguishing agent and the like.

In summary, in the battery pack of the embodiment, the accommodating cavity 5 and the opening valve 6 are disposed in the partition structure, and the extinguishing agent is filled in the accommodating cavity 5. When parameters such as temperature, pressure in the battery pack exceed preset standard values, the opening valve 6 can be opened, so that the accommodating cavity 5 is communicated with the mounting cavity 4, and the fire extinguishing agent in the accommodating cavity 5 enters the mounting cavity 4 to extinguish fire and cool the mounting cavity 4. Because the holding cavity is arranged in the separation structure, independent arrangement is not needed, the space utilization rate of the inside of the battery pack shell is improved, and the improvement of the total electric quantity and the energy density of the battery pack is facilitated.

The above embodiments are merely illustrative of the principles of the present utility model and its effectiveness, and are not intended to limit the utility model. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the utility model. Accordingly, it is intended that all equivalent modifications and variations of the utility model be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims

1. A battery pack, characterized in that: the battery pack comprises a shell, wherein an installation space is formed in the shell, a separation structure is arranged in the installation space, the separation structure separates the installation space into at least two installation cavities, and a battery cell module is arranged in each installation cavity;

2. The battery pack according to claim 1, wherein: the battery pack also comprises a controller and fault sensors arranged in the mounting cavity, and the controller is respectively connected with the opening valves and the fault sensors in a signal mode.

3. The battery pack according to claim 2, wherein: the fault sensor is a temperature sensor and/or a pressure sensor.

4. The battery pack according to claim 2, wherein: and an explosion-proof valve is arranged on the shell corresponding to the mounting cavity, and when the explosion-proof valve is opened, the mounting cavity is communicated with the outside of the shell.

5. The battery pack according to claim 4, wherein: the explosion-proof valve is in signal connection with the controller.

6. The battery pack according to claim 1, wherein: the separation structure comprises two partition boards which are arranged side by side, the partition boards are connected with the inner wall of the shell, and the accommodating cavity is formed between the two partition boards.

7. The battery pack according to claim 6, wherein: the opening valve is arranged on the partition board.

8. The battery pack according to claim 6, wherein: the partition board is made of heat conducting materials.

9. The battery pack according to claim 6, wherein: an insulating layer is arranged on the side surface of the partition plate corresponding to the mounting cavity.

10. The battery pack according to claim 1, wherein: the fire extinguishing agent is perfluoro-hexanone.