CN219558546U - Battery pack - Google Patents

Abstract

The utility model belongs to the technical field of power batteries, and particularly relates to a battery pack. Comprises a box body, a battery module, a structural member and a one-way valve; the battery module is arranged in the box body; the structural member is arranged in the box body and positioned among the plurality of battery modules, and a medium cavity for conveying fire extinguishing medium and/or storing the fire extinguishing medium is arranged in the structural member; the one-way valve is arranged on the structural member, is communicated with the medium cavity in a sealing way, and can open and spray the fire extinguishing medium and close and block the fire extinguishing medium from being sprayed. The battery pack of the utility model has at least the following beneficial effects: structural members and one-way valves are arranged between the battery modules so as to prevent the battery modules from blocking the one-way valves to spray fire extinguishing medium when thermal runaway occurs, the spraying range of the one-way valves is wide, and sprayed medium can act on a plurality of battery modules, so that fire extinguishment and cooling effects are improved, and the safety of a battery pack is improved.

Description

Battery pack

Technical Field

The utility model belongs to the technical field of power batteries, and particularly relates to a battery pack.

Background

With the popularization of electric automobiles, the thermal safety problem of power batteries is receiving more and more attention. The research of the thermal runaway characteristics of the power battery in different triggering modes and the passive safety protection problem of the battery module and the battery pack after the thermal runaway are the key points of the thermal safety research of the power battery. Thermal management systems are one of the effective methods for reducing the risk of thermal runaway, and the current thermal management includes various modes such as liquid cooling, air cooling, phase change materials, and the like.

When the battery is in thermal runaway, the temperature can be quickly increased and fire accidents are accompanied, and the prior art mostly adopts a passive mode to control the thermal runaway, so that the control effect is poor and the safety of the battery pack is affected.

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 problem of difficulty in fire extinguishment and temperature reduction when thermal runaway occurs in a battery in the prior art, so as to make the safety higher.

To achieve the above and other related objects, the present utility model provides a battery pack comprising:

a case;

the battery module is arranged in the box body;

the structural part is arranged in the box body and positioned among the plurality of battery modules, and a medium cavity for conveying fire extinguishing medium and/or storing the fire extinguishing medium is arranged in the structural part; and

the one-way valve is arranged on the structural member, is communicated with the medium cavity in a sealing way, and can open and spray the fire extinguishing medium and close and block the fire extinguishing medium from being sprayed.

Optionally, an intermediate beam is disposed at the bottom in the box, and the intermediate beam is formed as the structural member.

Optionally, the medium cavity stores a fire extinguishing agent.

Optionally, the battery module further comprises a cooling assembly for cooling the battery module, wherein the cooling assembly comprises a liquid cooling plate, and a cooling channel which is communicated with the medium cavity in a sealing way is arranged in the liquid cooling plate.

Optionally, the liquid cooling plate is laid at the bottom in the box, and the battery module and the structural member are laid on the liquid cooling plate.

Optionally, a liquid cooling plate is laid at the bottom in the box, a part of liquid cooling plate is towards the top of box is uplifted in order to form the uplift, uplift is located adjacent between the battery module, uplift is formed into the structure.

Optionally, a plurality of battery modules are juxtaposed in a plurality of rows, the structure is disposed between two adjacent rows of battery modules, and a plurality of check valves distributed along the arrangement direction of the battery modules are installed on the structure.

Optionally, the check valve has a plurality of injection ports, and an injection direction of at least one of the injection ports is toward a top of the case.

Optionally, the one-way valve includes:

the valve body is provided with an input channel which is communicated with the medium cavity in a sealing way, and the injection port is arranged on the valve body and is communicated with the input channel;

a blocking body movably installed in the valve body;

the spring is used for forming a pretightening force of the plugging body for plugging the input channel; and

and the electromagnetic coil is used for forming electromagnetic force for enabling the plugging body to move against the pretightening force so as to open the input channel.

Optionally, the device further comprises a battery management system, wherein the battery management system is electrically connected with the one-way valve and controls the opening and closing of the one-way valve.

As described above, the battery pack of the present utility model has at least the following advantageous effects: structural members and one-way valves are arranged between the battery modules so as to prevent the battery modules from blocking the one-way valves to spray fire extinguishing medium when thermal runaway occurs, the spraying range of the one-way valves is wide, and sprayed medium can act on a plurality of battery modules, so that fire extinguishment and cooling effects are improved, and the safety of a battery pack is improved.

Drawings

Fig. 1 is a schematic view showing a partial structure of an embodiment of a battery pack according to the present utility model;

FIG. 2 is a schematic exploded view of a part of the battery pack of FIG. 1;

FIG. 3 is a partial top view of the battery pack of FIG. 1;

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

FIG. 5 is an enlarged schematic view of portion B of FIG. 4;

FIG. 6 is a schematic view of the check valve of FIG. 1;

FIG. 7 is a perspective view of the check valve of FIG. 6;

FIG. 8 is a top view of the check valve of FIG. 6;

FIG. 9 is a cross-sectional view of C-C of FIG. 8;

fig. 10 is a cross-sectional view of D-D in fig. 8.

Description of the part reference numerals

The battery pack comprises a case 10, a battery module 20, a structural member 30, a mounting hole 301, a medium cavity 302, a check valve 40, a valve body 401, an input channel 4011, a horizontal section 4012, an injection port 4013, a vertical section 4014, a blocking body 402, a magnetic force acting portion 4021, an elastic blocking portion 4022, a spring 403, an electromagnetic coil 404, a liquid cooling plate 50, a battery management system 60 and an explosion-proof valve 70.

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 4, in some alternative embodiments, the present utility model provides a battery pack including a case 10, a battery module 20, a structural member 30, and a check valve 40. The battery pack may include an explosion-proof valve 70 and/or a battery management system (BatteryManagement System, BMS) 60 and/or a cooling assembly, in addition to the above-described components.

Alternatively, the battery module 20 is mounted in the case 10; the structural member 30 is installed in the case 10 and positioned between the plurality of battery modules 20, and a medium cavity 302 for the delivery of the fire extinguishing medium and/or the storage of the fire extinguishing medium is provided in the structural member 30; the check valve 40 is mounted on the structural member 30 in sealing communication with the medium chamber 302 and is capable of opening the discharge of the fire extinguishing medium and closing the discharge of the fire extinguishing medium.

Optionally, the plurality of battery modules 20 are juxtaposed in a plurality of rows, the structural member 30 is disposed between two adjacent rows of battery modules 20, and the structural member 30 is provided with a plurality of check valves 40 distributed along the arrangement direction of the battery modules 20. Further, the plurality of battery modules 20 may be juxtaposed in two or more rows, and the arrangement direction of the plurality of check valves 40 mounted on the same structural member 30 is the same as the arrangement direction of the plurality of battery modules 20 in the same row.

Optionally, the fire extinguishing medium stored in the structural member 30 may be a liquid fire extinguishing medium, a foam fire extinguishing medium, a dry powder fire extinguishing medium, a gaseous fire extinguishing medium or other fire extinguishing medium capable of extinguishing and cooling. When the fire extinguishing medium is a liquid fire extinguishing medium, the liquid fire extinguishing medium has larger specific heat capacity and vaporization latent heat, and the water mist sprayed by the check valve 40 can rapidly pour the fire flame, so that the temperature in the battery pack can be rapidly reduced.

Alternatively, the explosion-proof valve 70 is installed on the case 10, and the explosion-proof valve 70 is opened to communicate the inside of the case 10 with the outside of the case 10, so as to discharge the smoke inside the case 10 when thermal runaway occurs.

The battery pack of the embodiment is characterized in that the structural member 30 and the check valve 40 are arranged among the plurality of battery modules 20, the check valve 40 is prevented from being blocked by the battery modules 20 to spray fire extinguishing medium, when thermal runaway occurs, the check valve 40 can timely spray the fire extinguishing medium in the structural member 30, the sprayed fire extinguishing medium can be dispersed and acted on the plurality of battery modules 20 from all directions, large-area fire extinguishing and cooling are realized, the temperature in the battery pack is effectively reduced, and the safety performance is improved.

Referring to fig. 1-4, in some alternative embodiments, the bottom within the cabinet 10 is provided with an intermediate beam formed as a structural member 30. Therefore, the fire extinguishing medium is not required to be stored or conveyed by a separate structure, the space inside the battery pack is prevented from being occupied, and the energy density of the battery pack is improved.

Optionally, a fire extinguishing agent is stored in the medium chamber 302. Further, the fire extinguishing agent can be stored in the medium cavity 302 in advance as the fire extinguishing medium, and the medium cavity 302 and the outside of the structural member 30 have a certain pressure difference, the pressure in the medium cavity 302 is larger than the pressure outside the medium cavity 302, and when the one-way valve 40 is opened, the fire extinguishing agent in the medium cavity 302 can be directly sprayed out under the action of the pressure difference, so that no additional power component is needed, and the structure is simplified and the cost is reduced. It will be appreciated that the manner of spraying the fire suppressant within the medium chamber 302 is not limited to the above-described example of a pressure differential, and that the fire suppressant may be assisted by providing a motive means capable of providing a motive force for spraying the fire suppressant from within the medium chamber 302.

In the battery pack in the above embodiment, the structural member 30 and the case 10 are integrally formed, so that the overall structural strength of the case 10 can be enhanced, and the medium cavity 302 inside the structural member 30 can be used for conveying and/or storing the fire extinguishing medium, so that a conveying pipeline is not required to be additionally arranged, the structure is simplified, and the installation space is saved.

Referring to fig. 2 to 4, in some alternative embodiments, a cooling assembly is used to cool the battery module 20, the cooling assembly including a liquid cooling plate 50, and a cooling passage is provided in the liquid cooling plate 50 in sealed communication with the medium cavity 302. The medium cavity 302 may be in sealed communication with the cooling channel via a pipe, or may be in sealed communication via a fitting or other sealed connection.

Optionally, the liquid cooling plate 50 is disposed at the bottom of the case 10, and the battery module 20 and the structural member 30 are disposed on the liquid cooling plate 50.

Optionally, the cooling assembly further includes a cooling medium input pipe and a cooling medium output pipe, the cooling medium enters the liquid cooling plate 50 from the cooling medium input pipe, the cooling plate 50 cools each battery module 20, and the cooling medium in the liquid cooling plate 50 can be output through the cooling medium output pipe, so that continuous flow of the cooling medium is realized, and the cooling effect is ensured; wherein, part of the cooling medium can enter the structural member 30, that is, the fire extinguishing medium conveyed in the structural member 30 can be the cooling medium in the liquid cooling plate 50, and when thermal runaway occurs, the cooling medium is ejected out through the check valve 40. Thus, a separate fire extinguishing medium source is not required.

In the battery pack of the above embodiment, the liquid cooling plate 50 is arranged at the bottom of the battery module 20 and cooperates with the structural member 30 to convey the cooling medium between two adjacent rows of battery modules 20, so that the cooling medium is not hindered by the battery modules 20 when being sprayed out, the sprayed cooling medium has a wide application range, the cooling effect of the liquid cooling plate 50 on each battery module 20 in a normal state is ensured, and the heat absorption and heat dissipation balance capability is improved when thermal runaway occurs, so that the effects of fire extinguishment and cooling are rapidly achieved.

Referring to fig. 1 to 4, in some alternative embodiments, a liquid cooling plate 50 is laid at the bottom inside the case 10, a portion of the liquid cooling plate 50 bulges toward the top of the case 10 to form a bulge portion between adjacent battery modules 20, and the bulge portion is formed as a structural member 30 such that the check valve 40 mounted on the structural member 30 can be positioned in a gap region between the adjacent battery modules 20, facilitating smooth ejection of a medium from the check valve 40. The structural member 30 and the liquid cooling plate 50 are of an integrated structure, and the structure is simple and the production cost is low.

In summary, the structural member 30 may be an independently sealed structural member having a fire extinguishing agent stored therein to extinguish and cool the battery module 20 using the separate fire extinguishing agent; or the structural member 30 may be in communication with the liquid cooling plate 50 to extinguish fire and cool the battery module 20 using the cooling medium in the liquid cooling plate 50.

Referring to fig. 2, 4 to 7, in some alternative embodiments, the check valve 40 has a plurality of injection ports 4013, and the injection direction of at least one injection port 4013 of the plurality of injection ports 4013 is toward the top of the case 10, so that the fire extinguishing medium injected from the injection port 4013 can be injected above the case 10, so that the fire extinguishing medium can be scattered to act on the plurality of battery modules 20, the range of cooling and extinguishing is larger, and the cooling and extinguishing effect is improved.

Alternatively, the injection directions of the plurality of injection ports 4013 are each toward the top of the case 10, and the plurality of injection ports 4013 may be distributed along the circumferential direction of the valve body 401.

Referring to fig. 4-10, in some alternative embodiments, the check valve 40 includes a valve body 401, a blocking body 402, a spring 403, and a solenoid 404. An input channel 4011 communicated with the medium cavity 302 in a sealing way is arranged on the valve body 401, and an injection port 4013 is arranged on the valve body 401 and communicated with the input channel 4011; the blocking body 402 is movably installed in the valve body 401, and can block and open the input channel 4011; the spring 403 is used for forming a pre-tightening force of the blocking body 402 for blocking the input channel 4011; the electromagnetic coil 404 is used to form an electromagnetic force that moves the blocking body 402 against the preload force to open the input channel 4011.

Alternatively, the blocking body 402 includes a magnetic force acting portion 4021 and an elastic blocking portion 4022 connected to each other, when the electromagnetic coil 404 is energized to form an electromagnetic force, the magnetic force acting portion 4021 moves together with the elastic blocking portion 4022 against the pre-tightening force of the spring 403 under the action of the electromagnetic force, so that the elastic blocking portion 4022 is separated from the outlet end of the input channel 4011, and the input channel 4011 is opened, so that the medium can be ejected through the ejection opening 4013; when the electromagnetic coil 404 is de-energized, the electromagnetic force disappears, and the magnetic force acting portion 4021 and the elastic blocking portion 4022 move together to reset under the action of the elastic pre-tightening force formed by the spring 403, and the outlet end of the input channel 4011 is blocked tightly, so that the input channel 4011 is closed. Further, the magnetic force acting portion 4021 may be a magnet, and the elastic blocking portion 4022 may be a rubber sheet.

Optionally, the valve body 401 is provided with a mounting groove, the bottom of the mounting groove is provided with an opening communicated with the outlet end of the input channel 4011, and the plugging body 402 is movably installed in the mounting groove and can plug the opening, so that the outlet end of the input channel 4011 is plugged. The electromagnetic coil 404 is fixedly installed in the installation groove and is covered on the blocking body 402, and the spring 403 is located between the electromagnetic coil 404 and the blocking body 402, wherein two ends of the spring 403 respectively act on the electromagnetic coil 404 and the magnetic force acting part 4021. Further, one end of the spring 403 may be abutted or connected to the electromagnetic coil 404, and the other end of the spring 403 may be abutted or connected to the magnetic force applying portion 4021.

Referring to fig. 2, 4 to 10, in some alternative embodiments, a plurality of output passages are provided on the valve body 401, inlet ends of the output passages are communicated with the input passage 4011, outlet ends of the output passages are formed as injection ports 4013, and the plurality of output passages may be distributed along the circumferential direction of the valve body 401. The fire extinguishing medium discharged from the outlet end of the inlet channel 4011 enters the outlet channel and is discharged from the discharge port 4013.

Alternatively, the valve body 401 may be in a stepped columnar shape, the structural member 30 is provided with a mounting hole 301, and the small diameter end of the valve body 401 extends into the mounting hole 301 and is in sealing connection with the structural member 30.

Alternatively, the mounting groove and the output passage are provided at the large diameter end of the valve body 401, and the input passage 4011 is provided at the small diameter end of the valve body 401.

Optionally, the output channel can be of an inverted T shape, and the output channel adopting the structural design is beneficial to reducing the processing difficulty. The output channel comprises a horizontal section 4012 and a vertical section 4014, the horizontal section 4012 is arranged along the radial direction of the valve body 401, the vertical section 4014 is arranged along the axial direction of the valve body 401, the inlet end of the horizontal section 4012 is communicated with the outlet end of the input channel 4011, the outlet end of the horizontal section 4012 penetrates through the side wall of the valve body 401, the outlet end of the vertical section 4014 is formed into an injection port 4013, and the inlet end of the vertical section 4014 is communicated with the positions between the two ends of the horizontal section 4012. After the processing of the output channel is finished, when the valve body is used, the outlet end of the horizontal section 4012 is blocked, and the outlet end of the horizontal section 4012 is in a blocking state, so that fire extinguishing medium can be sprayed out from the outlet end of the vertical section 4014, and the fire extinguishing medium sprayed out from the spraying port 4013 can be sprayed out from the bottom of the battery pack to the top of the battery pack, so that the effects of rapidly cooling and extinguishing fire are achieved.

In the battery pack of the above embodiment, the output channel is arranged in the check valve 40, so that the fire extinguishing medium can be sprayed out from the top of the valve body 401 through the spraying opening 4013, and the fire extinguishing medium is subjected to omnibearing cooling and fire extinguishing in the process of reaching the bottom of the battery pack from the top of the battery pack, so that the cooling and fire extinguishing effects are improved; in addition, the output channel has simple structure and compact and reasonable layout, which is beneficial to reducing the volume of the one-way valve 40 and the occupied space.

Referring to fig. 2, 4, and 5, in some alternative embodiments, a battery management system 60 is electrically coupled to the check valve 40 and controls the opening and closing of the check valve 40.

Alternatively, the battery management system 60 is installed in the case 10 at the top of the liquid cooling plate 50, and the battery management system 60 may be electrically connected to the electromagnetic coil 404, and the power on and off of the electromagnetic coil 404 is controlled by the battery management system 60. When the battery module 20 operates normally, the battery management system 60 controls the solenoid 404 to be powered off, and the check valve 40 maintains a closed state; when the battery module 20 is out of control, the battery management system 60 can give out early warning and control the electromagnetic coil 404 to be electrified, and the check valve 40 is opened to spray fire extinguishing medium, so as to play roles in cooling and fire extinguishing.

According to the battery pack disclosed by the utility model, the structural part 30 and the one-way valve 40 are arranged between the adjacent battery modules 20, so that a certain gap is formed between the one-way valve 40 and the battery modules 20, the battery modules 20 are prevented from blocking the medium from being smoothly sprayed out of the one-way valve 40, and the fire extinguishing medium can be smoothly sprayed from the bottom of the battery pack to the top of the battery pack, so that the fire extinguishing medium is dispersed and acted on the plurality of battery modules 20, the cooling and fire extinguishing effects are improved, and the safety performance of the battery pack is improved.

In the description of the present specification, the descriptions of the terms "present embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

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 (10)

1. A battery pack, comprising:

a case;

the battery module is arranged in the box body;

the structural part is arranged in the box body and positioned among the plurality of battery modules, and a medium cavity for conveying fire extinguishing medium and/or storing the fire extinguishing medium is arranged in the structural part; and

the one-way valve is arranged on the structural member, is communicated with the medium cavity in a sealing way, and can open and spray the fire extinguishing medium and close and block the fire extinguishing medium from being sprayed.

2. The battery pack according to claim 1, wherein a bottom portion in the case is provided with a middle beam formed as the structural member.

3. The battery pack of claim 2, wherein the medium chamber stores a fire suppressant therein.

4. The battery pack of claim 1, further comprising a cooling assembly for cooling the battery module, the cooling assembly comprising a liquid cooling plate having a cooling channel disposed therein in sealed communication with the medium cavity.

5. The battery pack of claim 4, wherein the liquid cooling plate is disposed at the bottom of the case, and the battery module and the structural member are disposed on the liquid cooling plate.

6. The battery pack according to claim 1, wherein a liquid cooling plate is laid at the bottom in the case, a portion of the liquid cooling plate bulges toward the top of the case to form a bulge portion, the bulge portion is located between adjacent battery modules, and the bulge portion is formed as the structural member.

7. The battery pack according to claim 1, wherein a plurality of the battery modules are juxtaposed in a plurality of rows, the structural member is disposed between two adjacent rows of the battery modules, and a plurality of the check valves distributed along the arrangement direction of the battery modules are mounted on the structural member.

8. The battery pack according to any one of claims 1 to 7, wherein the check valve has a plurality of injection ports, and an injection direction of at least one of the injection ports is toward a top of the case.

9. The battery pack of claim 8, wherein the one-way valve comprises:

the valve body is provided with an input channel which is communicated with the medium cavity in a sealing way, and the injection port is arranged on the valve body and is communicated with the input channel;

a blocking body movably installed in the valve body;

the spring is used for forming a pretightening force of the plugging body for plugging the input channel; and

and the electromagnetic coil is used for forming electromagnetic force for enabling the plugging body to move against the pretightening force so as to open the input channel.

10. The battery pack according to claim 1, wherein: the battery management system is electrically connected with the one-way valve and controls the one-way valve to be opened and closed.