Battery pack with automatic fire extinguishing

Abstract

The utility model discloses a battery pack of automatic fire extinguishing, including casing, set up in casing battery group and be used for the cover of casing seal, casing is provided with first assembly cavity and second assembly cavity, first assembly cavity is used for assembling battery group, and second assembly cavity is used for assembling fire extinguishing jar, the cover is equipped with cover and connecting body, and the cover is covered first assembly cavity, and the cover is equipped with the delivery pipe in, and the cover is equipped with first assembly groove, and first assembly groove is used for assembling temperature -sensitive valve, and the connecting hole of temperature -sensitive valve is connected with delivery pipe, when the environment temperature that delivery pipe is at is greater than temperature threshold value, and temperature -sensitive valve is in conduction, the connecting body is equipped with the flow -through pipe in, and one end of flow -through pipe is connected with the jar mouth of fire extinguishing jar, and the other end of flow -through pipe is connected with delivery pipe, the present application technical scheme has solved the prior art scheme only can adopt external sprinkling type fire extinguishing, and this fire extinguishing mode effect is often poor, and can not timely alleviate the spontaneous combustion situation of new energy battery.

Description

Technical Field

[0001] This utility model relates to the field of battery pack fire extinguishing technology, specifically to an automatic fire extinguishing battery pack. Background Technology

[0002] With the rapid development of new energy vehicles and the energy storage industry, lithium-ion batteries and other new energy batteries are widely used in electric vehicles, energy storage power stations, and various portable devices. As the integration and protection unit for individual battery cells, the safety of the battery pack directly affects the reliability of the entire system. However, new energy batteries still carry the risk of thermal runaway during use. When a battery cell spontaneously combusts due to overcharging, internal short circuits, mechanical impact, or high ambient temperatures, the fire can spread rapidly within a short time, causing large-scale fires or even explosions, resulting in serious personal injury and property damage.

[0003] The main reason why spontaneous combustion fires of new energy batteries cannot be effectively and quickly controlled and extinguished is that they cannot be detected immediately when a battery malfunctions and spontaneously combusts, thus preventing immediate firefighting. In practice, fires are usually only discovered after they have spread, and only external spraying methods can be used for extinguishing, which are often ineffective and cannot promptly alleviate the situation.

[0004] Based on this, we will continue to improve the battery pack structure in the existing technical solutions in order to address the technical defects of the existing technical solutions. Utility Model Content

[0005] The purpose of this invention is to provide an automatic fire extinguishing battery pack to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An automatic fire extinguishing battery pack includes a housing, a battery pack disposed in the housing, and a cover plate for sealing the housing. The housing is provided with a first assembly cavity and a second assembly cavity. The first assembly cavity is used to assemble the battery pack, and the second assembly cavity is used to assemble the fire extinguishing canister.

[0008] The cover plate has a cover body and a connecting body. The cover body covers the first assembly cavity and has a conveying pipe. The cover body has a first assembly groove for assembling a temperature sensing valve. The connection hole of the temperature sensing valve is connected to the conveying pipe. When the ambient temperature of the conveying pipe is greater than the temperature threshold, the temperature sensing valve is in the conducting state.

[0009] In the specific implementation process, there are multiple first assembly slots depending on the size of the battery pack, and each first assembly slot is equipped with a temperature sensing valve.

[0010] The connecting body is equipped with a flow tube, one end of which is connected to the mouth of the fire extinguisher, and the other end of which is connected to the delivery tube.

[0011] The above technical solution produces the following technical effects:

[0012] In the specific application of the automatic fire extinguishing battery pack of this application, when a certain battery cell in the battery pack malfunctions, causing a local temperature rise in the battery pack, the temperature-sensing valve can automatically open after the temperature exceeds the temperature threshold, allowing the fire extinguishing agent in the fire extinguishing tank to be directly sprayed to the surrounding area of ​​the burning battery cell through the delivery pipe and the temperature-sensing valve, achieving "zero-distance" rapid fire extinguishing.

[0013] As a further improvement to the automatic fire extinguishing battery pack of this utility model, the connecting body is provided with a switch groove, which passes through the flow pipe. The switch groove is used to assemble a switch valve, which is used to control the conduction state of the flow pipe.

[0014] As a further improvement to the automatic fire extinguishing battery pack of this utility model, the switch valve is provided with a switch hole. When the switch hole is connected to the flow pipe, the flow pipe is in a conductive state.

[0015] As a further improvement to the automatic fire extinguishing battery pack of this utility model, the fire extinguishing canister is designed to have at least one, and each fire extinguishing canister corresponds to a switch valve.

[0016] As a further improvement to the automatic fire extinguishing battery pack of this utility model, the delivery pipe includes a first branch pipe and a second branch pipe, both of which are provided with through holes connected to the connection holes. In specific implementation, the number of branches of the delivery pipe is the same as the number of first assembly slots.

[0017] As a further improvement to the automatic fire extinguishing battery pack of this utility model, the top of the temperature sensing valve is provided with a connecting part, which is threadedly connected to the first assembly groove.

[0018] As a further improvement to the automatic fire extinguishing battery pack of this utility model, the bottom of the temperature sensing valve is provided with a support part, and the support part is equipped with a sealing plug. The sealing plug is used to support the temperature sensing trigger tube in the temperature sensing valve. When the ambient temperature where the temperature sensing trigger tube is located exceeds the temperature threshold, the temperature sensing valve is in the conducting state.

[0019] As a further improvement to the automatic fire extinguishing battery pack of this utility model, the delivery pipe is located under the cover.

[0020] The cover contains terminals that pass through it and are used to connect the battery pack to an external electrical device.

[0021] As a further improvement to the automatic fire extinguishing battery pack of this utility model, the cover is provided with an explosion-proof pressure relief port. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall exploded structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the structure of this utility model;

[0024] Figure 3 This is a schematic diagram of the cover plate structure of this utility model;

[0025] Figure 4 This is a schematic diagram of the shell structure of this utility model;

[0026] Figure 5 This is a top view of the cover plate of this utility model;

[0027] Figure 6 for Figure 5 Sectional view along AA;

[0028] Figure 7 for Figure 6 Enlarged view of region A in the middle.

[0029] In the picture:

[0030] 1-Shell;

[0031] 11-First assembly cavity;

[0032] 12-Second assembly cavity;

[0033] 2-Battery pack;

[0034] 3-Cover plate;

[0035] 31-Cap;

[0036] 311 - Delivery pipe;

[0037] 3111 - First branch pipe;

[0038] 3112 - Second branch pipe;

[0039] 3113 - Through hole;

[0040] 312 - First assembly slot;

[0041] 313 - Temperature sensing valve;

[0042] 3131 - Connecting hole;

[0043] 3132 - Support section;

[0044] 3133 - Sealing plug;

[0045] 3134 - Temperature-sensing trigger tube; 3135 - Connector;

[0046] 314-Pole Column;

[0047] 315 - Explosion-proof pressure relief port;

[0048] 32-Connector;

[0049] 321-Flow tube;

[0050] 322-Switch slot;

[0051] 33-Switch valve;

[0052] 331 - Switch hole;

[0053] 4-Fire extinguisher;

[0054] 41 - Mouth of the can. Detailed Implementation

[0055] It is known that in existing technologies, lithium-ion battery fires are primarily extinguished and cooled by external spraying or water application to the vehicle body. While these methods can mitigate the fire to some extent, they also have significant technical drawbacks. First, spontaneous combustion of individual battery cells is often difficult to detect in time. By the time external fire suppression measures are taken, the fire has often spread to the entire battery pack, and the opportunity to extinguish it has been missed. Second, most existing fire extinguishing agents are general-purpose, with limited effectiveness against spontaneous combustion of new energy batteries, resulting in low extinguishing efficiency and an inability to effectively prevent reignition or spread of the fire. Furthermore, external spraying or gas jet methods involve "long-distance" fire suppression, making it difficult for the extinguishing agent to directly target the ignition point of the burning battery cell, leading to unsatisfactory cooling and suppression effects.

[0056] Therefore, this application is motivated by the need to develop a zero-distance, rapid-response, temperature-sensing, automatic fire extinguishing integrated battery pack that can effectively solve the problem of spontaneous combustion and runaway fire of new energy batteries.

[0057] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0058] Implementation Method 1

[0059] like Figure 1-4As shown, this application proposes an automatic fire extinguishing battery pack structure to address the technical deficiencies in the aforementioned technical solutions. The battery pack of this application adds an independent fire extinguishing assembly chamber (second chamber) to the basic structure of the original battery pack housing 1. The cover plate 3 integrates a delivery pipe 311, a temperature-sensing valve 313, and a flow pipe 321, achieving connection with the fire extinguishing canister 4. Therefore, the technical solution of this application only requires controlling the on / off state of the fire extinguishing agent in the fire extinguishing pipe. Specifically, the automatic fire extinguishing battery pack designed in this application includes a housing 1, a battery pack 2 disposed in the housing 1, and a cover plate 3 for sealing the housing 1. The housing 1 is provided with a first assembly cavity 11 and a second assembly cavity 12. The first assembly cavity 11 is used to assemble the battery pack 2, and the second assembly cavity 12 is used to assemble the fire extinguishing canister 4. The cover plate 3 is provided with a cover body 31 and a connecting body 32. The cover body 31 covers the first assembly cavity 11. A delivery pipe 311 is provided in the cover body 31. The cover body 31 is provided with a first assembly groove 312, which is used to assemble a temperature sensing valve 312. The connection hole 3131 of the temperature sensing valve 313 is connected to the delivery pipe 311. When the ambient temperature of the delivery pipe 311 is greater than the temperature threshold, the temperature sensing valve 313 is in the conducting state. A flow pipe 321 is provided in the connecting body 32. One end of the flow pipe 321 is connected to the canister opening 41 of the fire extinguishing canister 4, and the other end of the flow pipe 321 is connected to the delivery pipe 311. In the specific implementation process, there are multiple first assembly slots 312 depending on the size of the battery pack, and each first assembly slot 312 is equipped with a temperature sensing valve 312.

[0060] Furthermore, in practical implementation, when an abnormality occurs in a single battery cell within the battery pack, causing a localized temperature rise, the temperature-sensing valve 313 automatically activates after the temperature exceeds a threshold, allowing the extinguishing agent to be directly sprayed through the delivery pipe 311 to the surrounding area of ​​the burning battery cell, achieving rapid "zero-distance" fire extinguishing. The accompanying special extinguishing agent possesses properties such as insulation, thermal conductivity, high flame retardancy, non-corrosiveness, and non-pollutingness. It can rapidly cool the area around the fire point and form a flame-retardant film, thereby effectively preventing the spread, diffusion, and reignition of the fire.

[0061] Therefore, the technical solution of this application not only solves the defects of the prior art such as delayed fire extinguishing response, poor fire extinguishing agent effect, and excessive fire extinguishing distance, but also realizes rapid detection and immediate suppression of spontaneous combustion inside the battery pack, significantly improving the safety performance of the battery pack and reducing personnel and property losses.

[0062] Implementation Method 2

[0063] like Figure 1-7As shown, further, unlike the implementation method, in order to further optimize the use of the fire extinguishing canister 4 in the technical solution of this application, specifically, the connecting body 32 of this application is provided with a switch 322, which passes through the flow pipe 321. The switch 322 is used to assemble a switch valve, which is used to control the conduction state of the flow pipe 321.

[0064] In the specific implementation process, to prevent misuse of the fire extinguisher 4 due to excessively high ambient temperatures before the battery pack structure is put into use, the switching valve of this application controls the use of the flow pipe 321. Specifically, as shown in the example... Figure 1 As shown, the top of the switch valve in this application has a slotted section. When the switch valve is assembled into the switch control 322, the switch valve achieves a conductive state between the switch hole 331 and the flow pipe 321 by turning the slotted section. Specifically, when the switch hole 331 and the flow pipe 321 are connected, the flow pipe 321 is in a conductive state. When the switch hole 331 avoids the flow valve, the extinguishing agent in the fire extinguishing tank 4 can be normally introduced into the flow pipe 321.

[0065] Furthermore, the fire extinguishing tank 4 is designed to have at least one, and each fire extinguishing tank 4 corresponds to a switch valve. In the specific implementation process, as shown in the figure, this application sets two fire extinguishing tanks 4. The first fire extinguishing tank 4 is set on the outer side closest to the flow pipe 321. The first switch valve is set between the first fire extinguishing tank 4 and the second fire extinguishing tank 4. The second switch valve is also set on the side away from the two fire extinguishing pipes.

[0066] In practice, as long as the outermost switch valve is closed, the extinguishing agent from both fire extinguishing tanks 4 will not be introduced into the flow pipe 321. Furthermore, when the fire extinguishing function needs to be activated, only the outermost switch valve needs to be opened. If only the extinguishing agent from the first fire extinguishing tank 4 needs to be used, the first switch valve should be kept closed. After opening the outermost switch valve, the extinguishing agent in the first fire extinguishing tank 4 can be discharged through the flow pipe 321. If the extinguishing agents from both fire extinguishing tanks 4 need to be used simultaneously, both switch valves need to be opened so that the extinguishing agents from both fire extinguishing tanks 4 can be smoothly introduced into the flow pipe 321, thereby achieving rapid and effective fire extinguishing operation. This design ensures that the fire extinguishing tanks 4 will not be accidentally triggered by environmental factors when not in use, and also allows for flexible control of the release of the extinguishing agent according to actual fire extinguishing needs.

[0067] Furthermore, the delivery pipe 311 includes a first branch pipe 3111 and a second branch pipe 3112, both of which are provided with through holes 3113 connected to the connecting hole 3131. In specific implementation, the number of branches of the delivery pipe 311 is the same as the number of first assembly slots 312. Thus, the first branch pipe 3111 and the second branch pipe 3112 can respectively guide the extinguishing agent to different key areas within the battery pack. When a battery cell ignites abnormally, the temperature sensing valve 313 is activated, and the extinguishing agent can be sprayed more precisely to the corresponding position around the burning battery cell through the delivery path in the first branch pipe 3111 or the second branch pipe 3112 connected to the connecting hole 3131, further improving the "zero-distance" fire extinguishing effect and ensuring that the extinguishing agent can quickly and effectively cover the fire source and suppress the fire.

[0068] Other implementations that are the same as those in this implementation will not be described again in this implementation.

[0069] Implementation Method 3

[0070] like Figure 1-7 As shown, unlike the previous embodiment, the temperature-sensing valve 313 has a connecting part 3115 at its top, which is threadedly connected to the first mounting groove 312. Therefore, the temperature-sensing valve 313 can be securely installed on the cover 31 via the threaded connection. This connection method is not only convenient for installation and disassembly, but also provides a firm connection that is not easily loosened. During the use of the battery pack, if a battery cell experiences abnormal temperature rise and ignition, the temperature-sensing valve 313 can quickly sense the temperature change and activate, allowing the extinguishing agent to be sprayed quickly and accurately to the fire location via a pre-designed path.

[0071] Meanwhile, since the temperature sensing valve 313 and the cover 31 are connected by threads, when it is necessary to replace or repair the temperature sensing valve 313, there is no need for complicated operations. You can simply unscrew the old temperature sensing valve 313 and screw on the new one, which greatly improves maintenance efficiency.

[0072] Furthermore, the bottom of the temperature-sensing valve 313 is provided with a support part 3132, and the support part 3132 is equipped with a sealing plug 3133. The sealing plug 3133 is used to support the temperature-sensing trigger tube 3134 in the temperature-sensing valve 313. When the ambient temperature of the temperature-sensing trigger tube 3134 exceeds the temperature threshold, the temperature-sensing valve 313 is in the conducting state.

[0073] In addition, the delivery pipe 311 is located below the cover 31. The cover 31 is provided with a terminal post 314, which passes through the cover 31. The terminal post 314 is used to connect the battery pack 2 to an external electrical device, and the first plate is provided with an explosion-proof pressure relief port 315.

[0074] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0075] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automatic fire extinguishing battery pack, comprising a housing (1), a battery pack (2) disposed within the housing (1), and a cover plate (3) for sealing the housing (1), characterized in that, The housing (1) is provided with a first assembly cavity (11) and a second assembly cavity (12). The first assembly cavity (11) is used to assemble the battery pack (2), and the second assembly cavity (12) is used to assemble the fire extinguisher (4). The cover plate (3) is provided with a cover body (31) and a connecting body (32). The cover body (31) covers the first assembly cavity (11). A conveying pipe (311) is provided in the cover body (31). The cover body (31) is provided with a first assembly groove (312). The first assembly groove (312) is used to assemble a temperature sensing valve (313). The connecting hole (3131) of the temperature sensing valve (313) is connected to the conveying pipe (311). When the ambient temperature of the conveying pipe (311) is greater than the temperature threshold, the temperature sensing valve (313) is in the conducting state. The connector (32) is provided with a flow pipe (321), one end of which is connected to the mouth (41) of the fire extinguisher (4), and the other end of which is connected to the delivery pipe (311).

2. The automatic fire extinguishing battery pack according to claim 1, characterized in that, The connector (32) is provided with a switch groove (322), which passes through the flow pipe (321). The switch groove (322) is used to assemble a switch valve (33), which is used to control the conduction state of the flow pipe (321).

3. The automatic fire extinguishing battery pack according to claim 2, characterized in that, The switching valve (33) is provided with a switching hole (331). When the switching hole (331) is connected to the flow pipe (321), the flow pipe (321) is in a conductive state.

4. The automatic fire extinguishing battery pack according to claim 2, characterized in that, The fire extinguishing canister (4) is designed to have at least one, and each fire extinguishing canister (4) corresponds to one of the switching valves (33).

5. The automatic fire extinguishing battery pack according to claim 1, characterized in that, The conveying pipe (311) includes a first branch pipe (3111) and a second branch pipe (3112), both of which are provided with through holes (3113) connected to the connecting hole (3131).

6. The automatic fire extinguishing battery pack according to claim 1, characterized in that, The temperature-sensing valve (313) has a connecting part (3135) at its top, and the connecting part (3135) is threadedly connected to the first assembly groove (312).

7. The automatic fire extinguishing battery pack according to claim 1, characterized in that, The temperature-sensing valve (313) has a support part (3132) at its bottom. The support part (3132) is equipped with a sealing plug (3133). The sealing plug (3133) is used to support the temperature-sensing trigger tube (3134) in the temperature-sensing valve (313). When the ambient temperature of the temperature-sensing trigger tube (3134) exceeds the temperature threshold, the temperature-sensing valve (313) is in the conducting state.

8. The automatic fire extinguishing battery pack according to claim 1, characterized in that, The delivery pipe (311) is located below the cover (31).

9. The automatic fire extinguishing battery pack according to claim 8, characterized in that, The cover (31) is provided with a terminal post (314), which passes through the cover (31) and is used to connect the battery pack (2) to an external power device.

10. The automatic fire extinguishing battery pack according to claim 8, characterized in that, The cover (31) is provided with an explosion-proof pressure relief port (315).

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