Treatment device for battery thermal runaway gas and battery pack

Abstract

The utility model relates to a battery thermal runaway gas treatment device and a battery pack. Relates to the technical field of new energy batteries. The liquid cooling device is specifically arranged on an exhaust channel of the battery pack and comprises a liquid cooling pipe extending in the vertical direction, and one side of the exhaust channel of the battery pack communicates with the middle of the liquid cooling pipe; the condenser is arranged at the top of the liquid cooling pipe and used for condensing the thermal runaway gas which comes from the exhaust channel and flows through the liquid cooling pipe into liquid, and the liquid storage tank is arranged at the bottom of the liquid cooling pipe and used for collecting the liquid formed by condensing the thermal runaway gas. Electrolyte steam exhausted by the exhaust passage of the battery pack flows to the liquid cooling pipe, the condenser is arranged at the top of the liquid cooling pipe to condense the electrolyte steam into liquid, and the liquid storage tank is arranged at the bottom of the liquid cooling pipe to collect the liquid, so that the electrolyte steam exhausted by the battery pack is treated, and the safety performance of the battery is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to new energy battery technical field especially relates to a kind of battery thermal runaway gas's

[0002] Processing device and battery pack. BACKGROUND

[0003] The application field of lithium ion battery is very extensive, in recent years, with the further development of lithium ion battery energy storage field, the safe use of lithium ion battery is also concerned. Due to the principle and structural characteristics of lithium ion battery, under the influence of overcharge, overdischarge, overheating, mechanical impact and other factors, the battery separator is easy to collapse and internal short circuit, which leads to thermal runaway. After the thermal runaway of lithium ion battery, the electrolyte in the cell boils to produce a large amount of electrolyte vapor.

[0004] On the cell of lithium ion battery, an explosion-proof valve is usually provided, when a large amount of electrolyte vapor is generated in the cell, the explosion-proof valve is opened, and the electrolyte vapor is sprayed out through the explosion-proof valve; A pressure relief valve is usually provided in the battery pack of lithium ion battery, and the electrolyte vapor sprayed out through the explosion-proof valve is sprayed into the battery cabin from the pressure relief valve of the battery pack. However, the electrolyte vapor sprayed into the battery cabin will condense on the wiring harness terminal, electrical device and other devices in the battery cabin at room temperature, and become liquid electrolyte. The electrolyte attached to the electrical device and wiring harness terminal will cause corrosion, thereby causing safety problems to the use of battery. SUMMARY

[0005] The utility model aims at the deficiency of prior art, provides a kind of battery thermal runaway gas's processing device and battery pack, electrolyte vapor discharged from battery pack can be handled, to prevent it from being attached to electrical device and wiring harness terminal after condensation and causing corrosion, so as to ensure the safety performance of battery.

[0006] The utility model provides a kind of battery thermal runaway gas's processing device, is located on the exhaust passage of battery pack, including the liquid cooling pipe extending in vertical direction, the exhaust passage of battery pack is communicated with the middle part of the liquid cooling pipe at one side;Condenser is arranged at the top of the liquid cooling pipe, to condense the thermal runaway gas from the exhaust passage and flow through the liquid cooling pipe into liquid, and storage tank is arranged at the bottom of the liquid cooling pipe, to collect the liquid formed by condensing thermal runaway gas.

[0007] Further, the condenser includes a coil pipe spirally wound around the outer periphery of the liquid cooling pipe, a cooling water inlet pipe communicated with one end of the coil pipe, and a cooling water outlet pipe communicated with the other end of the coil pipe, the cooling water inlet pipe is used to transport cooling water to the coil pipe, and the cooling water outlet pipe is used to discharge the cooling water flowing through the coil pipe.

[0008] Further, the liquid storage tank is detachably connected to the bottom of the liquid cooling pipe.

[0009] Further, the liquid cooling pipe comprises a communication part in communication with an exhaust passage of the battery pack, a transition part arranged at the top of the communication part, and a condensing part arranged at the top of the transition part, the condenser is arranged at the outer periphery of the condensing part, and the liquid storage tank is arranged at the bottom of the communication part.

[0010] Further, the caliber of the transition part at the end in communication with the communication part is greater than the caliber of the transition part at the end in communication with the condensing part.

[0011] Further, the condensing part comprises a plurality of condensing units connected in series, and at least one bending angle is arranged in the condensing units.

[0012] Further, the angle of the bending angle is between 0° and 90°.

[0013] Further, the condensing unit comprises a first inclined pipe and a second inclined pipe connected to each other, the angle between the first inclined pipe and the horizontal line is between 90° and 180°, and the bending angle is formed between the first inclined pipe and the second inclined pipe.

[0014] The utility model also provides a battery pack comprising the battery thermal runaway gas processing device, and further comprises an exhaust pipe for discharging the thermal runaway gas, wherein the exhaust pipe is in communication with the liquid cooling pipe.

[0015] Further, the end of the exhaust pipe in communication with the liquid cooling pipe extends inwardly in the liquid cooling pipe.

[0016] The battery thermal runaway gas processing device and the battery pack have the following advantages:

[0017] (1) The processing device comprises a liquid cooling pipe, a condenser and a liquid storage tank, an exhaust passage of a pressure relief valve of the battery pack is in communication with the middle part of the liquid cooling pipe at one side, so that the electrolyte vapor discharged from the exhaust passage flows to the liquid cooling pipe, the condenser is arranged at the top of the liquid cooling pipe to condense the electrolyte vapor into liquid, and the liquid storage tank is arranged at the bottom of the liquid cooling pipe to collect the liquid formed by the condensation of the electrolyte vapor, thereby processing the electrolyte vapor discharged from the battery pack, preventing corrosion caused by the electrolyte vapor adhering to the electrical devices and the wire harness terminals in the battery cabin after condensation, and further ensuring the safety performance of the battery.

[0018] (2) the condenser of the processing device comprises a coil pipe, a cooling water inlet pipe and a cooling water outlet pipe, the coil pipe is spirally wound outside the liquid cooling pipe, the cooling water inlet pipe is communicated with one end of the coil pipe, so that cooling water is introduced into the coil pipe through the cooling water inlet pipe, the cooling water flowing through the coil pipe exchanges heat with the electrolyte vapor flowing through the liquid cooling pipe, and the electrolyte vapor is condensed into liquid; the cooling water outlet pipe is communicated with the other end of the coil pipe, and the cooling water after heat exchange flows into the cooling water outlet pipe after flowing through the coil pipe, so that the cooling water after heat exchange is discharged through the cooling water outlet pipe;

[0019] (3) the liquid storage tank of the processing device is detachably connected with the bottom of the liquid cooling pipe, so that after the liquid storage tank is filled with liquid, the liquid storage tank can be taken off from the liquid cooling pipe, the liquid collected in the liquid storage tank is poured out, and then the liquid storage tank is installed at the bottom of the liquid cooling pipe, so that the device can be repeatedly used, the service life of the device is prolonged, and the production cost is reduced;

[0020] (4) a transition part is arranged between the communication part and the condensing part of the processing device, the communication part and the condensing part are separated by the transition part, the distance between the communication part and the condensing part is prevented from being too close, the influence of the condensing part on the temperature of the exhaust pipe when the condensing part is cooled is reduced, and the electrolyte vapor is prevented from being condensed into liquid when flowing through the exhaust pipe, so as to further ensure the safety performance of the battery;

[0021] (5) the condensing part of the processing device is composed of a plurality of bent condensing units connected in series, on the one hand, the condensing part with multiple bends can reduce the flow rate of the electrolyte vapor in the condensing part; on the other hand, when the electrolyte vapor flows along the condensing part with multiple bends, it can better contact the inner wall of the condensing part, so as to enhance the condensing effect of the electrolyte vapor and further improve the processing effect of the device on the battery thermal runaway gas;

[0022] (6) the end of the exhaust pipe of the battery pack communicated with the liquid cooling pipe extends inward in the liquid cooling pipe for a distance, so as to prevent the electrolyte vapor condensed into liquid from flowing downward along the inner wall of the liquid cooling pipe and flowing back into the exhaust pipe through the communication port of the exhaust pipe and the liquid cooling pipe, and further ensure the safety performance of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings, which are incorporated into and form part of the specification, illustrate embodiments of the present application and, together with the description, serve to explain the principles of the application. In these drawings, like reference numerals are used to represent like elements.

[0024] Fig. 1 is a structural schematic view of a battery thermal runaway gas processing device and a battery pack according to an embodiment of the present application;

[0025] Fig. 2A structure schematic view of a battery thermal runaway gas processing device according to an embodiment of the present application;

[0026] Fig. 3 An internal structure schematic view of a condenser of a battery thermal runaway gas processing device according to an embodiment of the present application;

[0027] Fig. 4 A plan view of a battery thermal runaway gas processing device connected with an exhaust pipe according to an embodiment of the present application;

[0028] Fig. 5 For Fig. 4 An enlarged schematic view of A in the middle.

[0029] In the figure: 1, battery pack; 11, exhaust pipe; 12, liquid cooling plate; 2, liquid cooling pipe; 21, communication part; 22, transition part; 23, condensing part; 231, first inclined pipe; 232, second inclined pipe; 3, condenser; 31, coil pipe; 32, cooling water inlet pipe; 33, cooling water outlet pipe; 4, liquid storage tank. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application, and all other embodiments obtained by those skilled in the art without creative labor on the basis of the embodiments in the present application belong to the protection scope of the present application.

[0031] Please refer to Figs. 1-5 The battery thermal runaway gas processing device according to an embodiment of the present application is arranged on an exhaust passage of the battery pack 1, and includes a liquid cooling pipe 2 extending in a vertical direction, wherein the exhaust passage of the battery pack 1 is communicated with a middle part of the liquid cooling pipe 2 at one side; a condenser 3 arranged at a top part of the liquid cooling pipe 2, used for condensing thermal runaway gas from the exhaust passage and flowing through the liquid cooling pipe 2 into liquid; and a liquid storage tank 4 arranged at a bottom part of the liquid cooling pipe 2, used for collecting the liquid formed by condensing the thermal runaway gas.

[0032] In actual use, after the lithium ion battery occurs thermal runaway, under high temperature and high pressure, the electrolyte in the battery cell boils to generate a large amount of electrolyte vapor, the electrolyte vapor is discharged to the battery pack 1 through the explosion-proof valve, and then discharged to the battery cabin through the pressure relief valve of the battery pack 1, and the battery thermal runaway gas processing device of the present application is arranged on the exhaust passage of the pressure relief valve of the battery pack 1.

[0033] Specifically, in the present application, the battery thermal runaway gas treatment device comprises a liquid cooling pipe 2, a condenser 3 and a liquid storage tank 4. The liquid cooling pipe 2 extends in the vertical direction. The exhaust passage of the pressure relief valve of the battery pack 1 is in communication with the middle part of the liquid cooling pipe 2 at one side, so that when the electrolyte vapor is discharged by the exhaust passage of the pressure relief valve of the battery pack 1, the electrolyte vapor discharged by the exhaust passage flows into the liquid cooling pipe 2.

[0034] The condenser 3 is arranged at the top of the liquid cooling pipe 2. The electrolyte vapor flowing into the liquid cooling pipe 2 flows upward in the liquid cooling pipe 2. When the electrolyte vapor flows through the area where the condenser 3 is arranged, the condenser 3 condenses the electrolyte vapor, so that the electrolyte vapor is condensed into liquid.

[0035] The liquid storage tank 4 is arranged at the bottom of the liquid cooling pipe 2. The liquid formed by the condensation of the electrolyte vapor flows downward in the liquid cooling pipe 2 to the liquid storage tank 4, so that the liquid formed by the condensation of the electrolyte vapor is collected by the liquid storage tank 4. Therefore, the electrolyte vapor discharged by the battery pack 1 can be treated by the device, and corrosion caused by the attachment of the electrolyte vapor on the electrical devices and the wire harness terminals in the battery compartment after condensation can be prevented, so that the safety performance of the battery can be ensured.

[0036] In the present embodiment, a battery pack 1 is also provided, which comprises the above-mentioned battery thermal runaway gas treatment device. Specifically, the battery pack 1 further comprises an exhaust pipe 11, which is the exhaust passage of the pressure relief valve of the battery pack 1. The exhaust pipe 11 is in communication with the middle part of the liquid cooling pipe 2 at one side, so that when the electrolyte vapor is discharged by the exhaust pipe 11 of the pressure relief valve of the battery pack 1, the electrolyte vapor discharged by the exhaust pipe 11 flows into the liquid cooling pipe 2.

[0037] Specifically, in actual implementation, the exhaust pipes 11 of a plurality of battery packs 1 can be connected in parallel and then connected to the liquid cooling pipe 2 at the same time, so that the battery thermal runaway gas treatment device can treat the electrolyte vapor discharged by a plurality of battery packs 1 at the same time, thereby enhancing the practicability of the battery thermal runaway gas treatment device.

[0038] In the present embodiment, the condenser 3 comprises a coil pipe 31, a cooling water inlet pipe 32 and a cooling water outlet pipe 33. The coil pipe 31 is spirally wound around the outer periphery of the liquid cooling pipe 2. The cooling water inlet pipe 32 is in communication with one end of the coil pipe 31, so that cooling water is introduced into the coil pipe 31 through the cooling water inlet pipe 32, the cooling water flowing through the coil pipe 31 exchanges heat with the electrolyte vapor flowing through the liquid cooling pipe 2, and the electrolyte vapor is condensed into liquid. The cooling water outlet pipe 33 is in communication with the other end of the coil pipe 31. The cooling water exchanged heat flows into the cooling water outlet pipe 33 after flowing through the coil pipe 31, so that the cooling water exchanged heat is discharged through the cooling water outlet pipe 33.

[0039] Since the battery pack 1 is usually provided with a liquid cooling plate 12, and a circulating pipeline of cooling water is arranged in the liquid cooling plate 12, in actual implementation, the cooling water inlet pipe 32 and the cooling water outlet pipe 33 of the condenser 3 in the present application can be communicated with the cooling water circulating pipeline in the liquid cooling plate 12 of the battery pack 1, so that the supply and discharge of the cooling water in the condenser 3 can be realized through the cooling water circulating pipeline in the liquid cooling plate 12 of the battery pack 1, thereby saving the space in the battery pack 1 and reducing the manufacturing cost of the battery pack 1.

[0040] In the present embodiment, the liquid storage tank 4 is detachably connected with the bottom of the liquid cooling pipe 2. Since the volume of the liquid that can be loaded in the liquid storage tank 4 is limited, in the present application, the liquid storage tank 4 is detachably connected with the bottom of the liquid cooling pipe 2, so that after the liquid storage tank 4 is filled with liquid, the liquid storage tank 4 can be removed from the liquid cooling pipe 2, the liquid collected in the liquid storage tank 4 is poured out for centralized treatment, and then the liquid storage tank 4 is installed at the bottom of the liquid cooling pipe 2, thereby enabling the device to be repeatedly used, prolonging the service life of the device, and reducing the production cost.

[0041] Specifically, in actual implementation, the liquid storage tank 4 can be detachably connected with the bottom of the liquid cooling pipe 2 in a screwing, clamping or other manner. In the present application, it is preferred that the liquid storage tank 4 is detachably connected with the bottom of the liquid cooling pipe 2 in a screwing manner, that is, an inner thread is arranged on the liquid storage tank 4, an outer thread is arranged at the bottom of the liquid cooling pipe 2, and the liquid storage tank 4 is detachably connected with the bottom of the liquid cooling pipe 2 through cooperation of the inner thread and the outer thread, which not only enables the installation and removal of the liquid storage tank 4 at the bottom of the liquid cooling pipe 2 to be simple and convenient, but also ensures the sealing of the connection between the liquid storage tank 4 and the liquid cooling pipe 2.

[0042] In the present embodiment, the liquid cooling pipe 2 includes a communication portion 21, a transition portion 22 and a condensation portion 23. The exhaust pipe 11 of the battery pack 1 is communicated with the communication portion 21 at one side, so that the electrolyte vapor discharged from the exhaust pipe 11 can flow into the communication portion 21. The transition portion 22 is arranged at the top of the communication portion 21, and the condensation portion 23 is arranged at the top of the transition portion 22. The electrolyte vapor flowing into the communication portion 21 flows upward, flows through the transition portion 22, and then flows to the area where the condensation portion 23 is located.

[0043] The coil pipe 31 of the condenser 3 is spirally wound in the condensation portion 23, so that the cooling water flowing through the coil pipe 31 exchanges heat with the electrolyte vapor flowing through the liquid cooling pipe 2, and the electrolyte vapor is condensed into liquid. The liquid storage tank 4 is arranged at the bottom of the communication portion 21, and the liquid formed by the condensation of the electrolyte vapor flows downward into the liquid storage tank 4 under the action of its own gravity, so that the liquid formed by the condensation of the electrolyte vapor is collected through the liquid storage tank 4.

[0044] Since the coil pipe 31 is coiled around the outer periphery of the condensing part 23, when the cooling water flows through the coil pipe 31, the temperature of the inner wall of the condensing part 23 is reduced, so that when the electrolyte vapor flows through the condensing part 23 and contacts the inner wall of the condensing part 23, it is condensed into liquid. If the distance between the communicating part 21 and the condensing part 23 is too close, when the cooling water flows through the coil pipe 31 and the temperature of the inner wall of the condensing part 23 is reduced, the temperature of the end of the exhaust pipe 11 connected to the communicating part 21 is also reduced due to conduction through the condensing part 23 and the communicating part 21, which may cause the electrolyte vapor to be condensed into liquid when flowing through the exhaust pipe 11, and then flowing back into the battery pack 1, affecting the safety performance of the battery.

[0045] Therefore, in the present application, the transition part 22 is arranged between the communicating part 21 and the condensing part 23, and the communicating part 21 and the condensing part 23 are separated by the transition part 22, so as to prevent the distance between the communicating part 21 and the condensing part 23 from being too close, thereby reducing the influence on the temperature of the exhaust pipe 11 when the condensing part 23 is cooled, and further preventing the electrolyte vapor from being condensed into liquid when flowing through the exhaust pipe 11, and further ensuring the safety performance of the battery.

[0046] Since the transition part 22 is arranged at the top of the communicating part 21, and the condensing part 23 is arranged at the top of the transition part 22, the electrolyte vapor flowing into the communicating part 21 flows through the transition part 22 and then flows to the area where the condensing part 23 is located, so that one end of the transition part 22 is connected to the communicating part 21, and the other end is connected to the condensing part 23. In the present embodiment, the transition part 22 is arranged as a reducing pipe, so that the diameter of one end of the transition part 22 connected to the communicating part 21 is larger than the diameter of the other end of the transition part 22 connected to the condensing part 23, so that the condensing part 23 is connected to the communicating part 21 through the transition part 22, and the diameter of the condensing part 23 is smaller than the diameter of the communicating part 21.

[0047] In the previous embodiment, it is mentioned that the coil pipe 31 is coiled around the outer periphery of the condensing part 23, and when the cooling water flows through the coil pipe 31, the temperature of the inner wall of the condensing part 23 is reduced, so that when the electrolyte vapor flows through the condensing part 23 and contacts the inner wall of the condensing part 23, it is condensed into liquid. Therefore, in the present application, the diameter of the condensing part 23 is arranged to be smaller than the diameter of the communicating part 21, so that the electrolyte vapor better contacts the inner wall of the condensing part 23 when flowing through the area where the condensing part 23 is located, thereby enhancing the condensation effect of the electrolyte vapor, and further improving the processing effect of the device on the battery thermal runaway gas.

[0048] In the present embodiment, the condensing portion 23 comprises a plurality of condensing units connected in series, at least one of which comprises a bending angle, i.e., the condensing portion 23 is formed by a plurality of bending condensing units connected in series. The condensing portion 23 is designed in this structure, on the one hand, because the condensing portion 23 with multiple bends can reduce the flow rate of electrolyte vapor in the condensing portion 23; on the other hand, when the electrolyte vapor flows through the condensing portion 23 with multiple bends, it can better contact the inner wall of the condensing portion 23, thereby enhancing the condensation effect of the electrolyte vapor and further improving the processing effect of the device on the battery thermal runaway gas.

[0049] Further, in the present embodiment, the angle of the bending angle a is set to be between 0° and 90°, so that when the electrolyte vapor flows through the condensing portion 23, the flow rate of the electrolyte vapor in the condensing portion 23 is better reduced, and the electrolyte vapor better contacts the inner wall of the condensing portion 23, further enhancing the condensation effect of the electrolyte vapor and improving the processing effect of the device on the battery thermal runaway gas.

[0050] It can be predicted that the greater the angle of the bending angle, the worse the effect of reducing the flow rate of the electrolyte vapor in the condensing portion 23; the smaller the angle of the bending angle, the greater the possibility of the electrolyte vapor being condensed into liquid and remaining in the condensing portion 23. Therefore, in the present application, the angle of the bending angle a is preferably 45°, so as to both ensure the effect of reducing the flow rate of the electrolyte vapor and prevent the liquid after the electrolyte vapor is condensed from remaining in the condensing portion 23 and failing to return to the liquid storage tank 4.

[0051] In the present embodiment, the condensing unit is taken as an example for illustration, wherein the condensing unit comprises a first inclined pipe 231 and a second inclined pipe 232, and the first inclined pipe 231 and the second inclined pipe 232 are connected to each other.

[0052] The angle b between the first inclined pipe 231 and the horizontal line is between 90° and 180°, and the bending angle a is formed between the first inclined pipe 231 and the second inclined pipe 232, so that when the electrolyte vapor flows through the first inclined pipe 231 and the second inclined pipe 232, the flow rate of the electrolyte vapor is reduced, and the electrolyte vapor better contacts the inner wall of the first inclined pipe 231 and the second inclined pipe 232, thereby enhancing the condensation effect of the electrolyte vapor and improving the processing effect of the device on the battery thermal runaway gas.

[0053] In the present embodiment, the end of the exhaust pipe 11 communicating with the liquid cooling pipe 2 extends inwardly in the liquid cooling pipe 2 by a distance, so as to prevent the liquid after the electrolyte vapor is condensed from flowing downward along the inner wall of the liquid cooling pipe 2 and flowing back into the exhaust pipe 11 through the communication port of the exhaust pipe 11 and the liquid cooling pipe 2, thereby further ensuring the safety performance of the battery.

[0054] The above-described content can be implemented alone or in various combinations, and these variations are within the protection scope of the present application.

[0055] It should be noted that, in this paper, the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment containing a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "including one" does not exclude the presence of other identical elements in the process, method, article or equipment including the element.

[0056] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit it. Although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A device for treating battery thermal runaway gas, arranged on an exhaust passage of a battery pack (1), characterized in that: The battery pack (1) includes a liquid cooling pipe (2) extending in a vertical direction, an exhaust passage of the battery pack (1) is communicated with a middle part of the liquid cooling pipe (2) on one side; a condenser (3) arranged on a top of the liquid cooling pipe (2) is used to condense thermal runaway gas flowing through the liquid cooling pipe (2) into liquid; and a liquid storage tank (4) arranged on a bottom of the liquid cooling pipe (2) is used to collect the liquid condensed by the thermal runaway gas.

2. A device for treating battery thermal runaway gases as defined in claim 1, wherein: The condenser (3) includes a coil pipe (31) spirally wound on an outer periphery of the liquid cooling pipe (2), a cooling water inlet pipe (32) communicated with one end of the coil pipe (31), and a cooling water outlet pipe (33) communicated with the other end of the coil pipe (31), the cooling water inlet pipe (32) is used to deliver cooling water to the coil pipe (31), and the cooling water outlet pipe (33) is used to discharge the cooling water flowing through the coil pipe (31).

3. A device for treating battery thermal runaway gases as defined in claim 1, wherein: The liquid storage tank (4) is detachably connected with the bottom of the liquid cooling pipe (2).

4. A device for treating battery thermal runaway gases as defined in claim 1, wherein: The liquid cooling pipe (2) includes a communication part (21) communicated with the exhaust passage of the battery pack (1), a transition part (22) arranged on a top of the communication part (21), and a condensing part (23) arranged on a top of the transition part (22), the condenser (3) is arranged on an outer periphery of the condensing part (23), and the liquid storage tank (4) is arranged on a bottom of the communication part (21).

5. A battery thermal runaway gas treatment device as defined in claim 4, characterized in that: The transition part (22) has a larger diameter at a communicated end with the communication part (21) than at a communicated end with the condensing part (23).

6. A battery thermal runaway gas treatment device as defined in claim 4, characterized by: The condensing part (23) includes a plurality of condensing units connected in series, and at least one bending angle is included in the condensing units.

7. A battery thermal runaway gas treatment device as defined in claim 6, characterized by: The bending angle is between 0° and 90°.

8. A battery thermal runaway gas treatment device as defined in claim 7, characterized by: The condensing unit includes a first inclined pipe (231) and a second inclined pipe (232) connected with each other, an included angle between the first inclined pipe (231) and a horizontal line is between 90° and 180°, and the bending angle is formed between the first inclined pipe (231) and the second inclined pipe (232).

9. A battery pack, characterized by, The battery thermal runaway gas treatment device includes the battery thermal runaway gas treatment device according to any one of claims 1-8, and further includes an exhaust pipe (11) used to discharge the thermal runaway gas, the exhaust pipe (11) is communicated with the liquid cooling pipe (2).

10. A battery pack as claimed in claim 9, characterized in that: The communicated end of the exhaust pipe (11) with the liquid cooling pipe (2) extends inwardly in the liquid cooling pipe (2).

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