Liquid drainage system of battery pack, battery pack assembly and vehicle

Abstract

The utility model relates to a liquid drainage system of a battery pack, a battery pack assembly and a vehicle, a heat exchange plate is arranged in an inner cavity of the battery pack, the liquid drainage system comprises a liquid drainage pipeline which can be communicated with the inner cavity of the battery pack so as to be at least used for circulating liquid leaked into the inner cavity; and the first liquid pumping device is communicated with the liquid discharging pipeline and is used for pumping the liquid in the inner cavity out of the battery pack. When an unexpected liquid leakage condition occurs in the inner cavity of the battery pack, the first liquid pumping device can drain the liquid in the inner cavity to the outside of the battery pack through the liquid drainage pipeline, so that a non-liquid-leakage state is kept in the inner cavity, the use safety of the battery pack is ensured, and thermal runaway caused by insulation failure or arc discharge is avoided.

Description

Technical Field

[0001] The present disclosure relates to the technical field of batteries, and in particular, to a liquid drainage system for a battery pack, a battery pack assembly, and a vehicle. Background Art

[0002] The inner cavity of a battery pack is usually a closed space to avoid unexpected leakage of liquid in the inner cavity. When liquid leaks into the inner cavity of the battery pack, it may cause insulation failure or arcing, posing a risk of thermal runaway. Such leakage may be caused by liquid outside the battery pack leaking into the inner cavity of the battery pack due to factors such as the vehicle wading or driving in rainy weather, or it may be caused by liquid in the heat exchange plate in the inner cavity of the battery pack leaking into the inner cavity of the battery pack. In some cases, there is also condensate generated by the heat exchange plate during the cooling operation, resulting in liquid remaining in the inner cavity and causing unexpected leakage. These unexpected leakages will all affect the safety of the battery pack during use. Summary of the Utility Model

[0003] To overcome the problems existing in the related art, the present disclosure provides a liquid drainage system for a battery pack, a battery pack assembly, and a vehicle to at least partially solve the problems existing in the related art.

[0004] According to the first aspect of the embodiments of the present disclosure, a liquid drainage system for a battery pack is provided. A heat exchange plate is disposed in the inner cavity of the battery pack. The liquid drainage system includes: a drainage pipeline capable of communicating with the inner cavity of the battery pack to at least be used for circulating the liquid leaking into the inner cavity; and a first liquid pumping device communicated with the drainage pipeline for pumping the liquid in the inner cavity to the outside of the battery pack.

[0005] Optionally, there are multiple drainage pipelines, and the multiple drainage pipelines are respectively communicated with the inner cavity of the battery pack.

[0006] Optionally, the liquid drainage system includes a liquid storage assembly for being disposed outside the battery pack. The first liquid pumping device is communicated with the drainage pipeline and the liquid storage assembly to pump the liquid in the inner cavity to the liquid storage assembly.

[0007] Optionally, the heat exchange plate is communicated with a heat exchange circuit of the battery pack. The heat exchange circuit includes a first pipeline for feeding liquid to the heat exchange plate, a second pipeline for discharging liquid from the heat exchange plate, and a liquid retention module for connecting between the first pipeline and the second pipeline. The liquid storage assembly includes the liquid retention module.

[0008] Optionally, the drainage pipeline includes the second pipeline.

[0009] Optionally, the liquid discharge pipeline includes the first pipeline, and a second liquid pumping device is connected to the first pipeline for pumping the liquid in the inner cavity of the battery pack to the liquid retention module through the first pipeline.

[0010] Optionally, stop valves are provided on both the first pipeline and the second pipeline.

[0011] Optionally, there are multiple liquid discharge pipelines, and a multi-way valve is connected between the multiple liquid discharge pipelines and the liquid storage assembly. The multi-way valve is configured to selectively connect one or more of the multiple liquid discharge pipelines to the liquid storage assembly.

[0012] According to a second aspect of the embodiments of the present disclosure, a battery pack assembly is provided, including a battery pack and the liquid discharge system of the battery pack provided by the present disclosure.

[0013] According to a third aspect of the embodiments of the present disclosure, a vehicle is provided, including the battery pack assembly provided by the present disclosure.

[0014] The technical solutions provided by the embodiments of the present disclosure may include the following beneficial effects: When an unexpected liquid leakage occurs in the inner cavity of the battery pack, the first liquid pumping device will discharge the liquid in the inner cavity to the outside of the battery pack through the liquid discharge pipeline, so that the inner cavity remains in a non-liquid-leakage state, thereby ensuring the use safety of the battery pack and avoiding thermal runaway caused by insulation failure or arcing.

[0015] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings herein are incorporated into the specification and form a part of the specification, showing embodiments consistent with the present disclosure, and are used together with the specification to explain the principles of the present disclosure.

[0017] Figure 1 is a flow path diagram of a battery pack in a normal state shown according to an exemplary embodiment.

[0018] Figure 2 is a flow path diagram of a situation where liquid leaks from the outside to the inside of the battery pack shown according to an exemplary embodiment.

[0019] Figure 3 is another flow path diagram of a situation where liquid leaks from the outside to the inside of the battery pack shown according to an exemplary embodiment.

[0020] Figure 4 is a flow path diagram of a situation where a heat exchange plate leaks inside the battery pack shown according to an exemplary embodiment.

[0021] Figure 5Another flow path diagram when the heat exchange plate leaks inside the battery pack, shown according to an exemplary embodiment.

[0022] Figure 6 Another flow path diagram when the heat exchange plate leaks inside the battery pack, shown according to an exemplary embodiment.

[0023] Figure 7 Another flow path diagram when the heat exchange plate leaks inside the battery pack, shown according to an exemplary embodiment.

[0024] Figure 8 A flow path diagram when the battery pack undergoes thermal runaway, shown according to an exemplary embodiment.

[0025] Description of reference numerals

[0026] 10 - Battery pack, 11 - Inner cavity, 12 - Heat exchange plate, 121 - First pipeline, 122 - Second pipeline, 13 - Liquid retention module, 131 - Water tank, 132 - Heat exchange flow path of other modules, 14 - Cut-off valve, 20 - Drainage pipeline, 21 - Multi-way valve, 30 - Liquid storage assembly, 41 - First liquid pumping device, 42 - Second liquid pumping device, 43 - Third liquid pumping device. Detailed implementation manners

[0027] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present disclosure. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0028] The implementation manners described in some embodiments of the present disclosure below do not represent all implementation manners consistent with the present disclosure. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0029] It should be noted that all actions of obtaining signals, information, or data in the present disclosure are carried out on the premise of complying with the corresponding data protection regulations and policies of the country where it is located and obtaining authorization from the owner of the corresponding device.

[0030] To maintain good safety performance of the battery pack 10, its inner cavity 11 is usually a closed space. Here, the inner cavity 11 refers to the cavity between the outer shell of the battery pack and other components installed inside, such as the heat exchange plate 12. When unexpected liquid leakage occurs inside the inner cavity 11 of the battery pack, it will cause insulation failure or arcing of the battery pack, leading to thermal runaway of the battery pack.

[0031] To this end, the embodiments of the present disclosure provide a liquid drainage system for a battery pack, which is used to drain the liquid leaked into the inner cavity 11. Refer to Figure 2 , the liquid drainage system includes a liquid drainage pipeline 20 and a first liquid pumping device 41. Among them, the liquid drainage pipeline 20 can be communicated with the inner cavity 11 of the battery pack 10 to at least be used for circulating the liquid leaked into the inner cavity 11. The at least used here means that the liquid drainage pipeline 20 can not only be used to drain the liquid leaked into the inner cavity 11, but also can be used for other purposes, such as the inflow or outflow of the heat exchange liquid in the heat exchange plate 12 described below. The first liquid pumping device 41 is communicated with the liquid drainage pipeline 20 and is used to pump the liquid in the inner cavity 11 to the outside of the battery pack 10, so as to provide power for the flow direction of the liquid. It can be understood that when it is detected that there is liquid leakage in the inner cavity 11, the first liquid pumping device 41 is turned on to pump out the liquid.

[0032] Through the above technical solution, when there is unexpected liquid leakage in the inner cavity 11 of the battery pack 10, the first liquid pumping device 41 will drain the liquid in the inner cavity 11 to the outside of the battery pack 10 through the liquid drainage pipeline 20, so that there is no liquid leakage in the inner cavity 11, thereby ensuring the use safety of the battery pack 10 and avoiding thermal runaway caused by insulation failure or arcing.

[0033] In the embodiments of the present disclosure, there can be multiple liquid drainage pipelines 20, and the multiple liquid drainage pipelines 20 can be respectively communicated with the inner cavity 11 of the battery pack 10, so as to turn on one or more liquid drainage pipelines 20 according to the leakage amount in the inner cavity 11, thereby improving the liquid drainage effect and reducing the risk of thermal failure when the leakage amount is large. When there are multiple liquid drainage pipelines 20, a liquid pumping device can be provided on each liquid drainage pipeline 20. Among them, the liquid pumping device can be a water pump or a centrifuge, etc.

[0034] In the embodiments of the present disclosure, the liquid drainage system can include a liquid storage assembly 30. The liquid storage assembly 30 is used to be arranged outside the battery pack 10. The liquid storage assembly 30 is communicated with the liquid drainage pipeline 20 to receive the liquid flowing out from the inner cavity 11 through the liquid drainage pipeline 20. The first liquid pumping device 41 can drain the liquid in the inner cavity 11 to the liquid storage assembly 30 through the liquid drainage pipeline 20. The liquid storage assembly 30 is arranged outside the battery pack 10, and the liquid in it can be poured out in time when the liquid storage capacity of the liquid storage assembly 30 reaches the upper limit. The liquid drainage pipeline 20 can be arranged at the lowest point of the battery pack 10 as much as possible to facilitate the complete drainage of the liquid. Correspondingly, the liquid storage assembly 30 can be arranged at a position lower than the battery pack 10 to facilitate the liquid to flow into it. In other embodiments, the liquid in the inner cavity 11 can also be directly drained to areas such as the ground.

[0035] The heat exchange circuit of the battery pack 10 is used to exchange heat for the battery so that the battery reaches a working state that meets the requirements. The heat exchange plate 12 is communicated with the heat exchange circuit of the battery pack 10 and plays a role in exchanging heat for the battery. Combined withFigures 1 to 8 , the heat exchange circuit includes a first pipeline 121 for supplying liquid to the heat exchange plate 12, a second pipeline 122 for discharging liquid from the heat exchange plate 12, and a liquid retention module 13 connected between the first pipeline 121 and the second pipeline 122. That is, the liquid in the liquid retention module 13 enters the heat exchange plate 12 through the first pipeline 121. After heat exchanging with the battery, the liquid in the heat exchange plate 12 flows out through the second pipeline 122 and returns to the liquid retention module 13, thereby realizing the heat exchange cycle. Here, the liquid retention module 13 can be a water tank 131 that supplies liquid to the heat exchange circuit; when there are multiple heat exchange flow paths connected in series in the whole vehicle to form a complete heat exchange circuit, such as having an electric drive assembly heat exchange flow path and a charger heat exchange flow path, etc., the liquid retention module 13 can be the heat exchange flow path 132 of other modules except the battery pack heat exchange flow path. In the embodiments of the present disclosure, the liquid storage assembly 30 can be a separately provided liquid storage tank (as shown in Figure 2 ), or the liquid storage assembly 30 can include the liquid retention module 13, or it can have both, and it can be selected according to the actual situation.

[0036] In one embodiment, the drain pipeline 20 can utilize the liquid discharge pipeline of the heat exchange circuit of the battery pack 10, that is, the second pipeline 122. When using the second pipeline 122 for drainage, the liquid inlet pipeline of the heat exchange circuit can be shut off to stop the liquid inlet, that is, stop the first pipeline 121 from supplying liquid to the heat exchange plate 12. Since it is in the same flow direction as the heat exchange circuit, the liquid discharge power of the second pipeline 122 can rely on the third liquid pumping device 43 in the heat exchange circuit to realize the liquid extraction.

[0037] In one embodiment, the drain pipeline 20 can utilize the liquid inlet pipeline of the heat exchange circuit of the battery pack 10, that is, the first pipeline 121. Since the flow direction of the first pipeline 121 in the heat exchange circuit is opposite to the flow direction when the first pipeline 121 is used as the drain pipeline 20, therefore, a second liquid pumping device 42 can be connected to the first pipeline 121 to pump the liquid in the inner cavity 11 of the battery pack 10 through the first pipeline 121 to the liquid retention module 13. When the first pipeline 121 is used as the drain pipeline 20, the second liquid pumping device 42 can be turned on for liquid pumping.

[0038] In the embodiments of the present disclosure, when the heat exchange plate 12 leaks, it is necessary to close the heat exchange circuit. Therefore, stop valves 14 can be provided on both the first pipeline 121 and the second pipeline 122 for opening and closing when needed.

[0039] When the drain pipe 20 includes multiple ones, for example, they can be multiple ones newly added to the battery pack 10, or they can be the pipes in the heat exchange circuit of the battery pack 10 as described above. To simplify the structure and provide multiple drainage methods, a multi-way valve 21 can be connected between the multiple drain pipes 20 and the liquid storage assembly 30. The multi-way valve 21 is configured to selectively communicate one or more of the multiple drain pipes 20 with the liquid storage assembly 30. The specific conduction path of the multi-way valve 21 can be selected according to actual needs, for example, it can be selected according to various leakage situations to be described below.

[0040] The following will Figures 1 to 8 briefly illustrate the conduction strategies of the drainage system in the embodiments of the present disclosure under different circumstances. The dotted lines in the figure represent the flow paths.

[0041] In the embodiments of the present disclosure, the leakage situation in the inner cavity 11 can be identified according to sensors. For example, a liquid leakage sensor can be arranged in the inner cavity 11 to detect whether there is liquid leakage in the inner cavity 11. And liquid leakage sensors can be arranged at multiple positions with different heights to determine the amount of liquid leakage. A pressure sensor can also be arranged in the heat exchange plate 12 or in the circuit communicated with the heat exchange plate 12 to judge whether the heat exchange plate 12 leaks by detecting the liquid pressure. When supplying liquid to the heat exchange plate 12 through a water kettle, a liquid level sensor can be arranged in the water kettle to detect the liquid level in the water kettle. Since the heat exchange process is cyclic, the liquid level in the water kettle hardly drops, or the drop amount is very small. According to the degree or speed of the liquid level drop detected by the liquid level sensor, the liquid leakage situation in the inner cavity 11 can be judged. In practical applications, the above-mentioned multiple sensors can be arranged, and corresponding judgment control strategies and alarm strategies can be set, so as to control the corresponding change of the flow path.

[0042] In Figure 1 , the flow path situation when no leakage occurs is shown. Among them, the drain pipe 20 in the middle of the drawing is closed, the heat exchange circuit exchanges heat normally, the first liquid pumping device 41 and the second liquid pumping device 42 are closed, the third liquid pumping device 43 is opened, and the liquid enters the heat exchange plate 12 through the first pipe 121 and flows out of the heat exchange plate 12 through the second pipe 122.

[0043] In Figure 2 and Figure 3 , the flow path situation when external liquid enters the inner cavity 11 of the battery pack 10 or the condensed water of the heat exchange plate 12 flows into the inner cavity 11 instead of the heat exchange plate 12 leaking is shown. At this time, on the basis of the flow path shown in Figure 1 , the first liquid pumping device 41 is opened, so that the drain pipe 20 in the middle of the drawing is opened and directly communicated with the liquid storage assembly 30, or the drain pipe 20 can be communicated with the liquid storage assembly 30 through the multi-way valve 21.

[0044] InFigure 4 In [description], the flow path situation when the internal heat exchange plate 12 of the battery pack 10 leaks is shown. At this time, Figure 2 and Figure 3 On the basis of [condition], the third liquid pumping device 43 can be closed, and the stop valves 14 at both places can also be closed to reduce the continuous inflow of the heat exchange liquid into the heat exchange plate 12 and reduce the impact.

[0045] In Figure 5 In [description], the flow path situation when the leakage amount of the heat exchange plate 12 in the battery pack 10 is relatively large is shown. On the basis of Figure 4 The third liquid pumping device 43 on the second pipeline 122 can be opened, so that the leaked liquid can be pumped out through the drain pipeline 20 in the middle of the drawing and the second pipeline 122 at the same time.

[0046] In Figure 6 In [description], the flow path diagram when the leakage amount of the heat exchange plate 12 in the battery pack 10 is very large and the leaked liquid needs to be pumped out as soon as possible is shown. On the basis of Figure 5 The second liquid pumping device 42 on the first pipeline 121 can be opened, so that the leaked liquid can be pumped out through the three pipelines shown in the drawing at the same time. In the above-mentioned multiple embodiments, after the liquid pumping is completed, the corresponding drain valve ports of the multi-way valve 21 are closed to prevent liquid backflow. Figure 7 The schematic diagram showing the heat exchange flow path 132 in which the liquid is pumped out to other modules is shown. When the liquid pumping amount is too large, it can be carried out as shown in Figure 6 and Figure 7 Pump liquid into the water tank 131 and the heat exchange flow path 132 of other modules, or a liquid storage tank can be additionally provided or directly discharged to the outside, etc.

[0047] For the battery pack 10, although the liquid inside has been discharged as much as possible, due to the liquid leaked in the early stage or part of the liquid still remaining in the battery pack 10, thermal runaway is triggered. At this time, the heat exchange circuit of the battery pack 10 can be restarted to make the liquid enter the battery pack 10 to prevent the battery pack 10 from exploding and causing other hazards.

[0048] When the thermal runaway risk of the battery pack 10 is very high, such as the thermal runaway risk can be judged by the liquid leakage amount or the temperature rise and pressure change of the battery pack 10, etc. In this case, in order to achieve temperature reduction to inhibit the harm of thermal spread, as shown in Figure 8 All pipelines can be opened and liquid can be injected into the battery pack 10 at the same time to avoid further hazards caused by the combustion of the battery pack 10.

[0049] It should be noted here that Figures 1 to 8 All are for illustrative purposes. The liquid discharged in each embodiment is not limited to being stored through the liquid storage components shown in the figure, and can also be stored through other flow paths.

[0050] According to a second aspect of the embodiments of the present disclosure, a battery pack assembly is provided, including the battery pack 10 and the drainage system of the above-mentioned battery pack, and having all the beneficial effects of the above-mentioned drainage system, which will not be elaborated here.

[0051] According to a third aspect of the embodiments of the present disclosure, a vehicle is provided, including the above-mentioned battery pack assembly, and having all the beneficial effects of the above-mentioned battery pack assembly, which will not be elaborated here. The vehicle can be a hybrid vehicle, an electric vehicle or other types of vehicles. The vehicle can be an autonomous vehicle, a semi-autonomous vehicle or a non-autonomous vehicle.

[0052] In addition, the word "exemplary" is used herein to mean serving as an example, instance, or illustration. Any aspect or design described herein as "exemplary" is not necessarily to be understood as advantageous compared to other aspects or designs. Instead, the use of the word exemplary is intended to present concepts in a concrete manner. As used herein, the term "or" is intended to mean an inclusive "or" rather than an exclusive "or". That is, unless otherwise specified or clear from the context, "X applies A or B" is intended to mean any arrangement in a natural inclusive arrangement. That is, if X applies A; X applies B; or X applies both A and B, then "X applies A or B" is satisfied in any of the foregoing instances. Additionally, unless otherwise specified or clear from the context referring to the singular form, the articles "a" and "an" as used in this application and the appended claims are generally understood to mean "one or more".

[0053] Similarly, although the present disclosure has been shown and described with respect to one or more implementations, equivalent variations and modifications will occur to those skilled in the art upon reading and understanding the specification and drawings. The present disclosure includes all such modifications and variations and is limited only by the scope of the claims. Specifically with respect to the various functions performed by the components described above (e.g., elements, resources, etc.), unless otherwise indicated, the terms used to describe such components are intended to correspond to any component (functionally equivalent) that performs the specific function of the described component, even if not structurally equivalent to the disclosed structure. Additionally, although a particular feature of the present disclosure may have been disclosed with respect to only one of several implementations, such a feature may be combined with one or more other features of other implementations as may be desired and advantageous for any given or particular application. Furthermore, with respect to the terms "comprising", "possessing", "having", "include", or variations thereof used in the detailed description or claims, such terms are intended to be inclusive in a manner similar to the term "including".

[0054] Those skilled in the art will readily conceive of other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include known common knowledge or conventional technical means in the technical field not disclosed in the present disclosure. The specification and examples are only illustrative, and the true scope and spirit of the present disclosure are pointed out by the appended claims.

[0055] It should be understood that the present disclosure is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present disclosure is only limited by the appended claims.

[0056] In the above detailed description, reference has been made to the drawings, in which specific aspects in which the present disclosure can be practiced are shown by way of illustration. In this regard, terms indicating directions or positional relationships such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. can be used with reference to the orientation of the described figures. Since the components of the described device can be positioned in a plurality of different orientations, the directional terms can be used for illustrative purposes and are not restrictive. It should be understood that other aspects can be utilized and structural or logical changes can be made without departing from the concept of the present disclosure. Therefore, the following detailed description should not be construed in a limiting sense.

[0057] It should be understood that unless otherwise specifically stated, the features of some embodiments of the present disclosure described herein can be combined with each other. As used herein, the term "and / or" includes any one of the related listed items and any combination of any two or more of them; similarly, "at least one of..." includes any one of the related listed items and any combination of any two or more of them.

[0058] It should be understood that unless otherwise clearly specified and defined, terms such as "engagement", "attachment", "installation", "connection", "coupling", "fixing", etc. used in the embodiments of the present disclosure should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral body; it can be a mechanical connection, an electrical connection, or a communication with each other; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication of the inner cavities of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in this article can be understood according to specific circumstances.

[0059] In addition, the term "above" as used herein with respect to a component, element, or layer of material formed "above" or located "above" a surface can be used to indicate that the component, element, or layer of material is "indirectly" positioned (e.g., placed, formed, deposited, etc.) on the surface such that one or more additional components, elements, or layers are disposed between the surface and the component, element, or layer of material. However, the term "above" as used herein with respect to a component, element, or layer of material formed "above" or located "above" a surface can also optionally have a specific meaning: the component, element, or layer of material is "directly" positioned (e.g., placed, formed, deposited, etc.) on the surface, e.g., in direct contact with the surface.

[0060] Although terms such as "first", "second", and "third" may be used herein to describe various components, elements, regions, layers, or sections, these components, elements, regions, layers, or sections are not limited to these terms. Rather, these terms are only used to distinguish one component, element, region, layer, or section from another. Thus, the first component, element, region, layer, or section mentioned in the examples described herein could also be termed the second component, element, region, layer, or section without departing from the teachings of the examples. Additionally, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description herein, "a plurality of" means at least two, e.g., two, three, etc., unless otherwise specifically and explicitly defined.

[0061] It should be understood that spatial relative terms, such as "above", "upper", "below", and "lower", are used herein to describe the relationship of one element shown in the figures to another element. In addition to the orientation depicted in the figures, such spatial relative terms are also intended to encompass different orientations of the device in use or operation. For example, if the device in the figures is flipped, an element described as "above" or "upper" relative to another element will then be "below" or "lower" relative to that other element. Thus, the term "above" encompasses both the above and below orientations depending on the spatial orientation of the device. The device may have other orientations (e.g., rotated 90 degrees or in other orientations), and the spatial relative terms used herein should be interpreted accordingly.

Claims

1. A liquid discharge system for a battery pack, characterized in that, The inner cavity of the battery pack is provided with a heat exchange plate, and the liquid drainage system includes: A liquid drainage pipeline capable of communicating with the inner cavity of the battery pack for at least circulating the liquid leaked into the inner cavity; and A first liquid pumping device communicated with the liquid drainage pipeline for pumping the liquid in the inner cavity to the outside of the battery pack.

2. The liquid drainage system according to claim 1, characterized in that The liquid drainage pipeline includes multiple ones, and the multiple liquid drainage pipelines are respectively communicated with the inner cavity of the battery pack.

3. The liquid drainage system according to claim 1, characterized in that, The liquid drainage system includes a liquid storage assembly for being arranged outside the battery pack, and the first liquid pumping device is communicated with the liquid drainage pipeline and the liquid storage assembly to pump the liquid in the inner cavity to the liquid storage assembly.

4. The liquid discharge system according to claim 3, wherein The heat exchange plate is communicated with a heat exchange circuit of the battery pack. The heat exchange circuit includes a first pipeline for feeding liquid to the heat exchange plate, a second pipeline for discharging liquid from the heat exchange plate, and a liquid retention module connected between the first pipeline and the second pipeline. The liquid storage assembly includes the liquid retention module.

5. The liquid drainage system according to claim 4, wherein, The liquid drainage pipeline includes the second pipeline.

6. The liquid drainage system according to claim 4, wherein The liquid drainage pipeline includes the first pipeline, and a second liquid pumping device is communicated with the first pipeline for pumping the liquid in the inner cavity of the battery pack to the liquid retention module through the first pipeline.

7. The liquid drainage system according to claim 4, characterized in that, Cut-off valves are arranged on both the first pipeline and the second pipeline.

8. The liquid drainage system according to claim 3, characterized in that, The liquid drainage pipeline includes multiple ones, and a multi-way valve is connected between the multiple liquid drainage pipelines and the liquid storage assembly. The multi-way valve is configured to selectively communicate one or more of the multiple liquid drainage pipelines with the liquid storage assembly.

9. A battery pack assembly, characterized in that, A battery pack and a liquid drainage system of the battery pack according to any one of claims 1-8.

10. A vehicle, characterized in that, A battery pack assembly according to claim 9.

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