High-safety new energy battery pack

Abstract

The application discloses a new energy battery pack with high safety, which comprises a box body, a cell assembly, a pressing plate assembly and a gas flow guide system. The cell assembly is fastened in the box body through the pressing plate assembly, and a ventilation hole is formed in the side wall of the box body. The pressing plate assembly has a air supply chamber and an air exhaust chamber, the gas flow guide system is in communication with the air supply chamber to form an air supply channel, and the gas flow guide system is in communication with the air exhaust chamber to form an air exhaust channel. The cell assembly comprises a plurality of cell monomers connected with each other, each cell monomer is provided with a pressure relief valve, and the pressure relief valve is in communication with the air exhaust chamber. The application improves the structure of the traditional pressing plate, sets the pressing plate assembly and cooperates with the gas flow guide system, when the cell works normally, the pressing plate can cooperate with the fan to realize air supply, so as to heat the cell, when the cell is abnormal, the pressing plate can also cooperate with the fan to realize air exhaust, and the high-temperature and high-pressure gas generated is discharged outside the box body in time, so that the use safety of the whole battery pack is improved.

Description

Technical Field

[0001] This invention relates to the field of new energy battery technology, and in particular to a high-safety new energy battery pack. Background Technology

[0002] The prior art (CN112635883A) discloses a new energy vehicle battery pack. Paragraphs 44 and 45 of the specification state that the battery assembly 2 further includes one or more pressure plates 24, which are pressed against the top of the cell group 21. Both ends of the pressure plates 24 are fixedly connected to the lower housing 11. Lugs extend outward from both ends of the pressure plates 24, and connecting holes are provided on the lugs. Screws passing through the connecting holes fix the pressure plates 24 to the lower housing 11. An opening 241 is provided on the pressure plate 24, corresponding to the position of the pressure relief valve of the cell 22. When the pressure relief valve is activated, gas is released through the opening 241.

[0003] As described above, the pressure plate 24 only serves to compress the cell assembly 21. When the pressure relief valve of the cell assembly 21 is activated, the gas will be released through the opening 241. Since the cell assembly 21 is sealed inside the casing, when a cell experiences thermal runaway, high-temperature and high-pressure gas will be ejected from the pressure relief valve. This high-temperature and high-pressure gas will then affect other cells, causing a chain reaction. The entire battery pack is highly susceptible to ignition and explosion.

[0004] Therefore, how to optimize the design of the pressure plate structure so that when the battery cell is working normally, the pressure plate can work with the fan to deliver air and dissipate heat from the battery cell, and when the battery cell malfunctions, the pressure plate can also work with the fan to exhaust air and expel the generated high-temperature and high-pressure gas from the casing in a timely manner, thereby improving the overall safety of the battery pack, is a technical problem that needs to be solved. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a high-safety new energy battery pack. When the battery cell is working normally, the pressure plate can work with the fan to deliver air and dissipate heat from the battery cell. When the battery cell malfunctions, the pressure plate can also work with the fan to exhaust air and promptly discharge the generated high-temperature and high-pressure gas outside the casing, thereby improving the overall safety of the battery pack.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] A high-safety new energy battery pack includes: a housing, a cell assembly, a pressure plate assembly, and a gas guiding system;

[0008] The battery cell assembly is fastened to the housing by the pressure plate assembly, and ventilation holes are provided on the side wall of the housing;

[0009] The pressing plate assembly has a gas supply chamber and a gas extraction chamber, the gas guide system forms a gas supply passage with the gas supply chamber, and the gas guide system forms a gas extraction passage with the gas extraction chamber.

[0010] The electric core assembly includes a plurality of electric core monomers connected with each other, each of the electric core monomers has a pressure relief valve, and the pressure relief valve is communicated with the gas extraction chamber.

[0011] In one of the embodiments,

[0012] The pressing plate assembly includes an upper cover plate, a lower cover plate and an intermediate partition plate, the upper cover plate is connected with the lower cover plate to form a hollow cavity, the intermediate partition plate is arranged in the hollow cavity, and the intermediate partition plate separates the hollow cavity into the gas supply chamber and the gas extraction chamber.

[0013] The upper cover plate is provided with a heat dissipation air inlet communicated with the gas supply chamber.

[0014] The gas extraction chamber is further provided with a pressure relief baffle, a pressure relief chamber is formed between the pressure relief baffle and the lower cover plate, the lower cover plate and the pressure relief baffle are respectively provided with a gas pressure relief first outlet and a gas pressure relief second outlet corresponding to the pressure relief valve, and the gas pressure relief second outlet is provided with a gas anti-channeling inclined plate.

[0015] In one of the embodiments,

[0016] The gas guide system includes a refrigeration device and a vortex fan, the refrigeration device generates cold air which is sent into the hollow cavity through forward rotation of the vortex fan, and the vortex fan is used for extracting the gas in the hollow cavity through reverse rotation.

[0017] In one of the embodiments, the gas guide system has a refrigeration chamber communicated with the hollow cavity.

[0018] In one of the embodiments, the lower cover plate is provided with a gas supply and extraction integrated hole.

[0019] In one of the embodiments, the high-safety new energy battery pack further includes a control board and a signal sensor.

[0020] The signal sensor is used for sensing a pressure relief signal at the pressure relief valve, and the control board is used for controlling forward rotation or reverse rotation of the vortex fan according to the pressure relief signal.

[0021] In one of the embodiments, the signal sensor is a smoke sensor or a temperature sensor.

[0022] In one of the embodiments, a plurality of independent pressure relief chambers are formed between the pressure relief baffle and the lower cover plate, and each of the pressure relief chambers corresponds to the pressure relief valve of each of the electric core monomers.

[0023] The high-safety new energy battery pack of the present application improves the structure of the traditional pressing plate, sets a pressing plate assembly, and uses the pressing plate assembly in cooperation with a gas flow guide system. When the battery cell is working normally, the pressing plate can cooperate with the fan to realize air supply, thereby cooling the battery cell. When the battery cell is abnormal, the pressing plate can also cooperate with the fan to realize air extraction, thereby discharging the high-temperature and high-pressure gas outside the box in time, and improving the use safety of the whole battery pack. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0025] Figure 1 Assembled view of the high-safety new energy battery pack of an embodiment of the present application;

[0026] Figure 2 Assembled view of the high-safety new energy battery pack of an embodiment of the present application; Figure 1 Exploded view of the high-safety new energy battery pack shown in FIG. 1;

[0027] Figure 3 Assembled view of the high-safety new energy battery pack of an embodiment of the present application; Figure 1 Cross-sectional view of the high-safety new energy battery pack shown in FIG. 1;

[0028] Figure 4 Assembled view of the high-safety new energy battery pack of an embodiment of the present application; Figure 1 Exploded view of the high-safety new energy battery pack of an embodiment of the present application;

[0029] Figure 5 Assembled view of the high-safety new energy battery pack of an embodiment of the present application; Figure 4 Exploded view of the high-safety new energy battery pack of an embodiment of the present application;

[0030] Figure 6 Assembled view of the high-safety new energy battery pack of an embodiment of the present application; Figure 3 Partial view of the high-safety new energy battery pack shown in FIG. 1;

[0031] Figure 7 Assembled view of the high-safety new energy battery pack of an embodiment of the present application; Figure 4 Cross-sectional view of the high-safety new energy battery pack of an embodiment of the present application;

[0032] Figure 8 Gas flow direction schematic diagram of air supply under normal conditions;

[0033] Figure 9 Gas flow direction schematic diagram of air extraction under abnormal conditions. DETAILED DESCRIPTION

[0034] For the purposes of promoting an understanding of the principles of the application, reference will now be made to the embodiments illustrated in the drawings. The embodiments shown are meant as non-limiting examples of the application. The application can be realized in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. The application is embodied in the combinations of the various features and aspects specifically described herein.

[0035] It is to be understood that where the terms "fixed" or "attached" are used herein, they can be direct or indirect. Where the terms "connected" or "coupled" are used herein, they can be direct or indirect. The terms "vertical", "horizontal", "left", "right", and the like as used herein are made only for purposes of illustration and are not intended to be limiting.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising", or "includes" and / or "including" when used herein, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0037] Referring to the drawings in which Figure 1 and Figure 2 , a high-safety new energy battery pack 10 is disclosed, comprising: a box body 100, a cell assembly 200, a pressing plate assembly 300, and a gas flow guide system 400.

[0038] As shown in Figure 1 , the cell assembly 200 is fastened in the box body 100 by the pressing plate assembly 300, and the side wall of the box body 100 is provided with a ventilation hole 110.

[0039] Referring to the drawings in which Figure 6 and Figure 7 , the pressing plate assembly 300 has a supply air chamber 301 and an exhaust air chamber 302, the gas flow guide system 400 penetrates the supply air chamber 301 to form a supply air passage 500 (as shown by the flow direction of the arrow), and the gas flow guide system 400 penetrates the exhaust air chamber 302 to form an exhaust air passage 600 (as shown by the flow direction of the arrow). Figure 8 Figure 9

[0040] As shown in Figure 3 , the cell assembly 200 comprises a plurality of cell monomers 210 connected to each other, and each cell monomer 210 is provided with a pressure relief valve 211, which is in communication with the exhaust air chamber 302.

[0041] The specific structure of the pressing plate assembly 300 will be described below.​​

[0042] Please see Figure 4 and Figure 5 , the pressing plate assembly 300 comprises: an upper cover plate 310, a lower cover plate 320, and an intermediate partition plate 330. The upper cover plate 310 is connected with the lower cover plate 320 to form a hollow cavity 700 (as shown in Figure 7 ), and the intermediate partition plate 330 is arranged in the hollow cavity 700. The intermediate partition plate 330 separates the hollow cavity 700 into a blowing chamber 301 and an exhaust chamber 302 (as shown in Figure 7 ).

[0043] The upper cover plate 310 is provided with a heat dissipation air port 311 (as shown in Figure 4 ) which communicates with the blowing chamber 301.

[0044] The exhaust chamber 302 is further provided with a pressure relief baffle 340 (as shown in Figure 5 ), and the pressure relief baffle 340 and the lower cover plate 320 form a pressure relief chamber 303 (as shown in Figure 7 ). The lower cover plate 320 and the pressure relief baffle 340 are respectively provided with a gas pressure relief first outlet 321 and a gas pressure relief second outlet 341 (as shown in Figure 7 ) which correspond to the pressure relief valve 211. The gas pressure relief second outlet 341 is provided with a gas anti-channeling inclined plate 342 (as shown in Figure 7 ).

[0045] Further, the gas guiding system 400 comprises a refrigerating device 410 and a vortex fan 420 (as shown in Figure 3 ). The refrigerating device 410 generates cold air which is sent into the hollow cavity 700 through the forward rotation of the vortex fan 420. The vortex fan 420 is reversely rotated to exhaust the gas in the hollow cavity 700.

[0046] Next, the working principle of the new energy battery pack 10 with high safety and the above structure will be described.

[0047] Under normal circumstances, the refrigerating device 410 generates cold air which is sent into the hollow cavity 700 through the forward rotation of the vortex fan 420. The cold air passes through the blowing passage 500, and since the heat dissipation air port 311 is provided at the upper cover plate 310 and communicates with the blowing chamber 301, the cold air can be discharged from the heat dissipation air port 311, thereby achieving heat dissipation of the battery cell. In the present application, the refrigerating device 410 generates cold air to achieve heat dissipation of the battery cell. Compared with the traditional pure natural blowing or natural exhaust, the cold air has better heat dissipation effect and is suitable for some application environments with high requirements.

[0048] The entire pressing plate assembly 300 is located at the upper part of the battery cell assembly 200. The cold air is sprayed out from the heat dissipation air port 311 and easily settles down, thereby achieving better heat dissipation.

[0049] When the battery cell is in thermal runaway, the high-temperature and high-pressure gas generated in the battery cell will be discharged through the pressure relief valve 211, and the high-temperature and high-pressure gas with a fire core will first reach the pressure relief chamber 303 (as shown in Figure 9 The high-temperature and high-pressure gas with a fire core will effectively be extinguished by impacting on the pressure relief chamber 303, reducing the probability of the fire core spewing out; it should be particularly pointed out that in the present application, the intermediate partition plate 330 is specially arranged to form a relatively sealed air extraction chamber 302, so that the high-temperature and high-pressure gas with a fire core cannot spew out through the heat dissipation air outlet 311, and can only be discharged through the air extraction channel 600;

[0050] At the same time, the turbofan 420 will be reversed to start the air extraction mode, and the airflow in the air supply channel 500 will flow in the opposite direction and form a negative pressure at the channel opening of the air extraction channel 600, and the high-temperature and high-pressure gas with a fire core will further reach the air extraction chamber 302 (as shown in Figure 9 After passing through the pressure relief chamber 303, it is extracted to the outside of the box through the air extraction channel 600, avoiding the influence of the adjacent battery cell to produce a chain reaction, thereby improving the use safety of the entire battery pack.

[0051] In the present embodiment, the gas flow guide system 400 has a refrigeration chamber 800 in communication with the hollow cavity 700, and preferably, the air supply and extraction integrated hole 322 (as shown in Figure 4 It can be understood that the gas flow guide system 400 and the pressure plate assembly 300 form a relatively closed air flow channel, which is not only beneficial to air supply, but also beneficial to air extraction.

[0052] In the present application, the new energy battery pack 10 with high safety further comprises a control board and a signal sensor; the signal sensor is used for sensing the pressure relief signal at the pressure relief valve 211, and the control board is used for controlling the turbofan to rotate forward or reverse according to the pressure relief signal. For example, the signal sensor is a smoke sensor or a temperature sensor. In the normal state, there is no high-temperature and high-pressure gas overflowing at the pressure relief valve 211, and the signal sensor will not generate a sensing signal, and the control board controls the turbofan to rotate forward to realize cold air delivery; when the battery cell is in thermal runaway, the high-temperature and high-pressure gas generated in the battery cell will be discharged through the pressure relief valve 211, and the signal sensor will generate a sensing signal and send it to the control board, and the control board will control the turbofan to reverse, thereby rapidly discharging the high-temperature and high-pressure gas from the box.

[0053] In the present application, a plurality of mutually independent pressure relief chambers 303 (as shown in Figure 7As shown in the figure, each pressure relief chamber 303 corresponds to the pressure relief valve 211 of each battery cell monomer 210, and a gas anti-channeling inclined plate 342 is arranged at the gas pressure relief second outlet 341. In this way, when a certain battery cell monomer 210 occurs thermal runaway, it will not directly affect the adjacent battery cell monomer, preventing thermal runaway chain reaction, and improving the overall safety of the battery pack.

[0054] The new energy battery pack 10 with high safety of the present application improves the structure of the traditional pressing plate, sets the pressing plate assembly 300, and uses the pressing plate assembly 300 in cooperation with the gas flow guide system 400. When the battery cell works normally, the pressing plate can cooperate with the fan to realize air supply, thereby realizing heat dissipation of the battery cell. When the battery cell abnormally works, the pressing plate can also cooperate with the fan to realize air exhaust, thereby discharging the high-temperature and high-pressure gas outside the box in time, and improving the use safety of the whole battery pack.

[0055] The above-mentioned embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as the limitation of the patent scope of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which belong to the protection scope of the present application. Therefore, the protection scope of the present application patent should be subject to the appended claims.

Claims

1. A high-safety new energy battery pack, characterized in that, include: Housing, battery cell assembly, pressure plate assembly, gas flow system; The battery cell assembly is fastened to the housing by the pressure plate assembly, and the side wall of the housing is provided with ventilation holes; the pressure plate assembly has an air supply chamber and an air exhaust chamber, the gas guiding system is connected to the air supply chamber to form an air supply channel, and the gas guiding system is connected to the air exhaust chamber to form an air exhaust channel; the battery cell assembly includes multiple interconnected battery cell units, each battery cell unit has a pressure relief valve, and the pressure relief valve is connected to the air exhaust chamber; The pressure plate assembly includes: an upper cover plate, a lower cover plate, and a middle partition plate; The upper cover plate and the lower cover plate are connected to form a hollow cavity. The middle partition plate is disposed in the hollow cavity, and the middle partition plate divides the hollow cavity into the air supply chamber and the air exhaust chamber. A heat dissipation vent communicating with the air supply chamber is opened on the upper cover plate. A pressure relief baffle is also provided in the air exhaust chamber. A pressure relief chamber is formed between the pressure relief baffle plate and the lower cover plate. A first gas pressure relief outlet and a second gas pressure relief outlet corresponding to the pressure relief valve are respectively opened on the lower cover plate and the pressure relief baffle plate. A gas anti-channeling inclined plate is provided at the second gas pressure relief outlet. The gas guiding system includes a cooler and a turbofan. The cooler produces cold air and the turbofan forward-rotates it into the hollow cavity. The turbofan reverses to extract the gas from the hollow cavity.

2. The high-safety new energy battery pack according to claim 1, characterized in that, The gas guiding system has a cooling chamber that communicates with the hollow cavity.

3. The high-safety new energy battery pack according to claim 2, characterized in that, An integrated air supply and exhaust vent is provided at the lower cover plate.

4. The high-safety new energy battery pack according to any one of claims 1 to 3, characterized in that, The high-safety new energy battery pack also includes a control board and signal sensors; The signal sensor is used to sense the pressure relief signal at the pressure relief valve, and the control board is used to control the turbine fan to rotate forward or backward according to the pressure relief signal.

5. The high-safety new energy battery pack according to claim 4, characterized in that, The signal sensor is a smoke sensor or a temperature sensor.

6. The high-safety new energy battery pack according to claim 1, characterized in that, Multiple independent pressure relief chambers are formed between the pressure relief baffle and the lower cover plate, and each pressure relief chamber corresponds to the pressure relief valve of each battery cell.

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