Liquid inlet detection structure and battery pack

Abstract

The invention relates to the technical field of electric energy storage, and discloses a liquid inlet detection structure and a battery pack, and the liquid inlet detection structure comprises a battery box body which is provided with an electrical cabin; the insulating base is mounted and fixed in the electrical cabin; wherein the insulating base is provided with a liquid storage cavity and a liquid inlet hole for communicating the liquid storage cavity to the electrical cabin; at least one electrified conductor extends into the liquid storage cavity along the Z direction, and an interval space is reserved between the electrified conductor and the cavity bottom of the liquid storage cavity; when the liquid level in the liquid storage cavity is lower than the bottom surface of the electrified conductor, the electrified conductor and the battery box body are in an open circuit state; when the liquid level in the liquid storage cavity is higher than the bottom surface of the electrified conductor, the electrified conductor and the battery box body are in a closed state; and the detection circuit is electrically connected with the battery box body and is used for detecting the electrified state of the battery box body. According to the liquid inlet detection structure and the battery pack provided by the invention, the problem that liquid inlet detection cannot be performed on the existing battery pack can be effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric energy storage, and in particular to a liquid inlet detection structure and a battery pack. Background Art

[0002] In the current market, battery packs are the core energy storage units of various electric devices, and their stability and safety are of vital importance. However, there is a common problem with existing battery packs: if water accidentally enters the battery pack or coolant leaks, the existing monitoring system often cannot detect the problem and issue an alarm in the first time. The consequence of this situation is that users or maintenance personnel will only realize the existence of the problem when the liquid accumulates to a certain level, causing obvious signs of failure inside the battery pack. But at this stage, the battery cells and other key components in the battery pack may have suffered irreversible damage.

[0003] This phenomenon of delayed problem detection not only affects the service life of the battery pack, but also may bring a series of safety hazards. First, the intrusion of moisture or coolant may cause a short circuit in the internal circuit of the battery, which may lead to serious accidents such as overheating, fire or even explosion. Secondly, damage to the internal cells of the battery pack will directly affect the performance of the battery, reduce its energy density and charging and discharging efficiency, and thus shorten the service life of the entire device. In addition, since the battery pack is one of the more expensive components in the equipment, irreversible damage also means high economic losses.

[0004] Therefore, it is necessary to test the existing battery pack to solve the problem that it cannot perform liquid ingress detection.

[0005] The above information disclosed in this Background section is included only for enhancement of understanding of the background of the present disclosure and therefore it may contain information that does not form the prior art that is currently known to a person of ordinary skill in the art. Summary of the invention

[0006] An object of the present invention is to provide a liquid ingress detection structure and a battery pack, which can effectively solve the problem that the existing battery pack cannot perform liquid ingress detection.

[0007] To achieve the above objectives, the present invention provides a liquid inlet detection structure and a battery pack, comprising:

[0008] include:

[0009] A battery box, wherein the battery box is provided with an electrical compartment;

[0010] An insulating base, the insulating base is installed and fixed in the electrical compartment; wherein the insulating base is provided with a liquid storage cavity and a liquid inlet hole connecting the liquid storage cavity to the electrical compartment;

[0011] A charged conductor, at least one of which extends into the liquid storage cavity along the Z direction and leaves a gap with the bottom of the liquid storage cavity; wherein when the liquid level in the liquid storage cavity is lower than the bottom surface of the charged conductor, the charged conductor and the battery case are in an open circuit state; when the liquid level in the liquid storage cavity is higher than the bottom surface of the charged conductor, the charged conductor and the battery case are in a connected state;

[0012] A detection circuit is electrically connected to the battery box and is used to detect the charged state of the battery box.

[0013] Optionally, the liquid inlet hole is opened on one side of the insulating base along the X direction, and the position of the liquid inlet hole is higher than the side of the charged conductor facing the bottom of the liquid storage cavity along the Z direction.

[0014] Optionally, a plurality of reinforcing beams are provided in the electrical compartment, and a liquid-passing gap is left between each of the reinforcing beams and the bottom of the electrical compartment;

[0015] The insulating base is fixedly mounted along the Z direction on a side of one of the reinforcing beams away from the bottom surface of the electrical compartment.

[0016] Optionally, also include:

[0017] A sealing ring is located between the insulating base and the reinforcing beam; wherein the sealing ring is provided with an inner hole, and the insulating base is provided with a penetrating detection hole at a position corresponding to the inner hole.

[0018] Optionally, it also includes an intermediate conductive copper bar spanning the liquid storage cavity along the Y direction, a first end conductive copper bar for electrically connecting one end of the intermediate conductive copper bar to the power supply device, and a second end conductive copper bar for electrically connecting the other end of the intermediate conductive copper bar to the power supply device;

[0019] Wherein, the live conductor is installed at the middle conductive copper bus and is electrically connected to the middle conductive copper bus.

[0020] Optionally, the live conductor is threadedly connected to the middle conductive copper busbar.

[0021] Optionally, the battery box further comprises a battery compartment located on one side of the electrical compartment along the X direction, and a liquid cooling plate located below both the electrical compartment and the battery compartment, wherein a cooling liquid flow channel is provided in the liquid cooling plate;

[0022] The battery box is provided with an internal joint connecting the coolant flow channel to the electrical compartment, an external joint connecting the electrical compartment to the external space of the battery box, and a connecting pipe connecting the internal joint and the external joint.

[0023] Optionally, the insulating base is provided with a mounting groove for mounting and fixing the Hall sensor.

[0024] Optionally, the insulating base includes a base box body provided with the liquid storage cavity and the liquid inlet hole, and a box body top cover snap-connected to the top of the base box body, and the box body top cover is provided with the mounting groove.

[0025] On the other hand, a battery pack is provided, comprising any of the liquid ingress detection structures described above.

[0026] The beneficial effects of the present invention are: providing a liquid inflow detection structure and a battery pack. Generally, when the battery case is well sealed and no liquid enters the electrical compartment, there will be no liquid in the liquid storage cavity. Therefore, the charged conductor and the battery case are in an open circuit state, and the battery case detected by the detection circuit is in a non-charged state. If the battery case is poorly sealed and liquid enters the electrical compartment, the liquid in the electrical compartment oscillates and flows, and finally enters the liquid storage cavity through the liquid inlet hole. When the liquid level in the liquid storage cavity is higher than the bottom surface of the charged conductor, the charged conductor and the battery case are connected through the liquid in the liquid storage cavity, and the battery case detected by the detection circuit is in a charged state, and an alarm can be issued or preset protection measures can be executed. Therefore, as long as the charged state of the battery case is monitored, it can be timely discovered whether liquid has entered the liquid inflow detection structure.

[0027] Therefore, the liquid ingress detection structure and battery pack provided by the present invention can effectively solve the problem that the existing battery pack cannot perform liquid ingress detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0029] Figure 1 A schematic diagram of a structure in which a liquid inlet detection structure provided in an embodiment is installed in a battery pack;

[0030] Figure 2 for Figure 1 A schematic diagram of the structure of the electrical compartment and a partially enlarged portion of the battery compartment in a battery pack provided in an embodiment;

[0031] Figure 3 A schematic diagram of the structure of the connection between the insulating base and the conductive copper busbar in the liquid inlet detection structure provided in the embodiment;

[0032] Figure 4 for Figure 3 Explosion diagram of

[0033] Figure 5 A cross-sectional schematic diagram of an insulating base provided in an embodiment;

[0034] Figure 6 An exploded schematic diagram of a battery pack provided in an embodiment.

[0035] In the figure:

[0036] 1. Battery box; 101. Electrical compartment; 102. Battery compartment; 103. Liquid cooling plate; 1031. Cooling liquid flow channel; 104. Reinforcement beam;

[0037] 2. Insulating base; 201. Base box body; 2011. Liquid storage cavity; 2012. Liquid inlet hole; 2013. Detection hole; 202. Box body top cover; 2021. Mounting slot; 203. Threaded sleeve;

[0038] 3. Live conductor;

[0039] 4. Sealing ring; 401, inner hole of the ring;

[0040] 5. Sealing structure;

[0041] 6. Conductive copper busbar at the first end;

[0042] 7. Middle conductive copper busbar;

[0043] 8. A conductive copper busbar at the second end;

[0044] 9. Tighten the bolts;

[0045] 10. Internal joints;

[0046] 11. External connector;

[0047] 12. Connect the pipeline;

[0048] 13. Hall sensor. DETAILED DESCRIPTION

[0049] The reference to "embodiment" in the present invention means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present invention. The word "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or association with other embodiments. In principle, in the present invention, as long as there is no technical contradiction or conflict, the various technical features mentioned in each embodiment can be combined in any way to form a corresponding implementable technical solution.

[0050] Unless otherwise defined, the technical terms used herein have the same meanings as those generally understood by those skilled in the art to which the present invention belongs; the use of relevant terms herein is only for describing specific embodiments and is not intended to limit the present invention.

[0051] In the description of the present invention, the term "and / or" is an expression used to describe the logical relationship between objects, indicating that three relationships may exist, for example, A and / or B, which means: A exists, B exists, and A and B exist at the same time. In addition, the character " / " in this article generally indicates that the objects before and after are in a logical relationship of "or".

[0052] In the present invention, terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship of quantity, priority or sequence between these entities or operations.

[0053] Without further restrictions, in the present invention, the words "include", "comprises", "has" or other similar expressions used in sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product including the elements, so that the process, method or product including a series of elements may include not only those limited elements, but also other elements not explicitly listed, or also include elements inherent to such process, method or product.

[0054] Similar to the understanding in the Examination Guidelines, in the present invention, expressions such as "greater than", "less than", "exceed" and the like are understood to exclude the number itself; expressions such as "above", "below", "within" and the like are understood to include the number itself. In addition, in the description of the embodiments of the present invention, the meaning of "multiple" is more than two (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups", "multiple times", etc., unless otherwise clearly and specifically limited.

[0055] In the description of the embodiments of the present invention, the space-related expressions used, such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or position relationship based on the orientation or position relationship shown in the specific embodiments or drawings, and are only for the convenience of describing the specific embodiments of the present invention or facilitating the reader's understanding, and do not indicate or imply that the referred device or component must have a specific position, a specific orientation, or be constructed or operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0056] Unless otherwise expressly specified or limited, in the description of the embodiments of the present invention, the terms such as "install", "connect", "connect", "fix", "set" and the like used should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integrated setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art of the technical field to which the present invention belongs, the specific meanings of the above terms in the embodiments of the present invention can be understood according to the specific circumstances.

[0057] The present invention provides a liquid ingress detection structure and a battery pack, which are suitable for application scenarios in which whether there is liquid in a battery pack is detected, and can effectively solve the problem that existing battery packs cannot perform liquid ingress detection.

[0058] The battery pack provided by the present invention comprises a liquid inlet detection structure, a battery module located in the liquid inlet detection structure, and a battery box cover located above the liquid inlet detection structure and cooperating with the liquid inlet detection structure to cover the battery module.

[0059] See also Figure 1~Figure 5 The liquid inlet detection structure includes a battery box 1, an insulating base 2, a charged conductor 3, and a detection circuit.

[0060] The battery box 1 is provided with an electrical compartment 101, a battery compartment 102 located on one side of the electrical compartment 101 along the X direction, and a liquid cooling plate 103 located below both the electrical compartment 101 and the battery compartment 102, and a cooling liquid flow channel 1031 is provided in the liquid cooling plate 103. The battery module is located in the battery compartment 102, and circulating cooling liquid is fed into the cooling liquid flow channel 1031 to exchange heat with the battery module, thereby realizing temperature control of the battery module.

[0061] The insulating base 2 is installed and fixed in the electrical compartment 101 . The insulating base 2 is provided with a liquid storage cavity 2011 and a liquid inlet hole 2012 connecting the liquid storage cavity 2011 to the electrical compartment 101 .

[0062] At least one charged conductor 3 extends into the liquid storage cavity 2011 along the Z direction, and leaves a gap between the charged conductor 3 and the bottom of the liquid storage cavity 2011; wherein, when the liquid level in the liquid storage cavity 2011 is lower than the bottom surface of the charged conductor 3, the charged conductor 3 and the battery case 1 are in an open circuit state; when the liquid level in the liquid storage cavity 2011 is higher than the bottom surface of the charged conductor 3, the charged conductor 3 and the battery case 1 are in a connection state.

[0063] The detection circuit is electrically connected to the battery box 1 and is used to detect the charged state of the battery box 1. It should be noted that the specific circuit structure of the detection circuit is not the focus of this embodiment, so it will not be described in detail.

[0064] The liquid inlet detection structure and battery pack provided in the present embodiment are as follows: under normal circumstances, when the battery case 1 is well sealed and no liquid has entered the electrical compartment 101, there will be no liquid in the liquid storage chamber 2011. Therefore, the charged conductor 3 and the battery case 1 are in an open circuit state, and the battery case 1 detected by the detection circuit is in a non-charged state (the battery case 1 is grounded, and the current and voltage are both zero); if the battery case 1 is poorly sealed and liquid enters the electrical compartment 101, the liquid in the electrical compartment 101 oscillates and flows, and finally enters the liquid storage chamber 2011 through the liquid inlet hole 2012. When the liquid level in the liquid storage chamber 2011 is higher than the bottom surface of the charged conductor 3, the charged conductor 3 and the battery case 1 are connected through the liquid in the liquid storage chamber 2011, and the battery case 1 detected by the detection circuit is in a charged state (the current and / or voltage of the battery case 1 are not zero). At this time, an alarm can be issued or preset protection measures can be executed, such as sending a liquid inlet prompt sound, sending a text pop-up window for liquid inlet warning, or automatically cutting off the power supply of the battery module. Therefore, as long as the charged state of the battery box 1 is monitored, it can be discovered in time whether liquid has entered the liquid inlet detection structure.

[0065] Therefore, the liquid ingress detection structure and battery pack provided by the present invention can effectively solve the problem that the existing battery pack cannot perform liquid ingress detection.

[0066] It should be noted that, under normal circumstances, when the liquid level in the electrical compartment 101 is higher than the liquid inlet hole 2012, the liquid in the electrical compartment 101 can enter the liquid storage chamber 2011 through the liquid inlet hole 2012. If the battery pack is used in scenarios such as power batteries for new energy vehicles, the battery pack will shake during the driving of the new energy vehicle. During the shaking process, even if the liquid level in the electrical compartment 101 is low, it may enter the liquid storage chamber 2011, so that the problem of liquid inflow into the battery pack can be discovered earlier.

[0067] In this embodiment, see Figure 3 and Figure 4 The liquid inlet hole 2012 is provided on one side of the insulating base 2 along the X direction, and the position of the liquid inlet hole 2012 is higher than the side of the charged conductor 3 along the Z direction facing the bottom of the liquid storage cavity 2011. It can be understood that by limiting the position of the liquid inlet hole 2012 to be higher than the bottom surface of the charged conductor 3, it is possible to prevent the liquid in the liquid storage cavity 2011 from flowing out through the liquid inlet hole 2012 before contacting the charged conductor 3, resulting in the occurrence of liquid inlet detection failure.

[0068] Optional, see Figure 5 The liquid inlet detection structure further includes a sealing ring 4 located between the insulating base 2 and the inner wall of the electrical compartment 101. The sealing ring 4 is provided with an inner hole 401, and the liquid storage cavity 2011 is provided with a penetrating detection hole 2013 corresponding to the position of the inner hole 401.

[0069] After the liquid in the electrical compartment 101 enters the liquid storage chamber 2011 through the liquid inlet hole 2012, it will first flow downward through the detection hole 2013 to the inner hole 401. Due to the sealing effect of the sealing ring 4, the liquid cannot flow out through the gap between the insulating base 2 and the battery case 1. As the amount of liquid entering the liquid storage chamber 2011 gradually increases, the liquid level in the liquid storage chamber 2011 gradually rises to a level higher than the bottom surface of the charged conductor 3. At this time, the charged conductor 3 can be electrically connected to the battery case 1 through the liquid in the liquid storage chamber 2011 and the inner hole 401 in turn, thereby making the battery case 1 charged.

[0070] In this embodiment, a plurality of reinforcing beams 104 are provided in the electrical compartment 101; a gap with liquid is left between each reinforcing beam 104 and the bottom of the electrical compartment 101. The insulating base 2 is fixedly mounted along the Z direction on one side of one of the reinforcing beams 104 away from the bottom surface of the electrical compartment 101. In the existing battery pack, a sealing coating is usually provided between the reinforcing beam 104 and the battery case 1 to prevent the liquid from flowing freely inside the battery case 1. In the present invention, a gap with liquid is left between each reinforcing beam 104 and the bottom of the electrical compartment 101, which is conducive to the free flow of liquid inside the battery case 1, thereby increasing the probability of the liquid in the electrical compartment 101 entering the liquid storage cavity 2011 through the liquid inlet hole 2012.

[0071] Optional, see Figure 6 The outer periphery of the electrical compartment 101 is coated with a sealing structure 5 such as a sealing coating or a sealing gasket to limit the liquid in the liquid inlet cavity from penetrating into the battery compartment 102, thereby further protecting the battery module in the battery compartment 102.

[0072] Optional, see Figure 3~Figure 5 The liquid inlet detection structure also includes an intermediate conductive copper bar 7 spanning the liquid storage cavity 2011 along the Y direction, a first end conductive copper bar 6 for electrically connecting one end of the intermediate conductive copper bar 7 to the power supply device, and a second end conductive copper bar 8 for electrically connecting the other end of the intermediate conductive copper bar 7 to the power supply device; wherein the live conductor 3 is installed at the intermediate conductive copper bar 7 and is electrically connected to the intermediate conductive copper bar 7.

[0073] It should be noted that the first end conductive copper bar 6, the middle conductive copper bar 7, and the second end conductive copper bar 8 are mainly provided to electrically connect the live conductor 3 to the power supply device so that the power supply device carries voltage. Specifically, the power supply device may be a battery module, or a BDU (i.e., Battery Disconnect Unit) or a BMS (i.e., Battery Management System), etc., and even an independent power supply may be specially provided for the live conductor 3 as a power supply device, which is not limited in the present invention.

[0074] Optionally, the insulating base 2 has a built-in threaded sleeve 203 , and the first end conductive copper bar 6 , the middle conductive copper bar 7 , and the second end conductive copper bar 8 are fastened and installed on the insulating base 2 by fastening bolts 9 threadably connected to the threaded sleeve 203 .

[0075] Furthermore, the live conductor 3 is threadedly connected to the middle conductive copper busbar 7. By twisting the live conductor 3, the bottom height of the live conductor 3 can be adjusted, thereby adjusting the detection sensitivity. Specifically, the lower the bottom height of the live conductor 3, the higher the sensitivity of liquid inflow detection, and a small amount of liquid inflow can make the live conductor 3 conductive with the battery case 1; conversely, the higher the bottom height of the live conductor 3, the lower the sensitivity of liquid inflow detection, and a large amount of liquid inflow can make the live conductor 3 conductive with the battery case 1. Manufacturers can adjust the bottom height of the live conductor 3 according to production and design needs so that the sensitivity of liquid inflow detection meets the needs.

[0076] In this embodiment, see Figure 4 The insulating base 2 includes a base box body 201 having a liquid storage cavity 2011 and a liquid inlet hole 2012, and a box body top cover 202 connected to the top of the base box body 201 by snapping, and a mounting groove 2021 is provided on the box body top cover 202. When the box body top cover 202 is opened, the fastening bolts 9 and the live conductor 3 can be screwed.

[0077] In this embodiment, see Figure 2 The battery box 1 is provided with an internal joint 10 connecting the coolant flow channel 1031 to the electrical compartment 101 , an external joint 11 connecting the electrical compartment 101 to the external space of the battery box 1 , and a connecting pipe 12 connecting the internal joint 10 and the external joint 11 .

[0078] Generally, the risk of leakage at the connector position is relatively high. Therefore, the risk of leakage at the external connector 11 and the internal connector 10 is relatively high. In this embodiment, the external connector 11 and the internal connector 10 are both installed in the electrical compartment 101. When the external connector 11 and the internal connector 10 leak, the liquid will first enter the electrical compartment 101, and before penetrating into the battery module in the battery compartment 102, the charged conductor 3 will be connected to the battery box 1, triggering the detection circuit to sound an alarm or execute preset protection measures, thereby providing liquid intrusion protection to the battery module to the greatest extent.

[0079] Optionally, the insulating base 2 is provided with a mounting groove 2021 for mounting and fixing the Hall sensor 13. The Hall sensor 13 is provided in the battery pack to perform non-contact current detection, helping the battery management system to monitor the charge and discharge status of the battery, and to achieve battery balancing and fault diagnosis. Therefore, the Hall sensor 13 is an electronic device that is provided in many battery packs. In this embodiment, the fixed base of the Hall sensor 13 is used as the insulating base 2, which is conducive to reducing the number of components and improving the structural compactness of the liquid inlet detection structure.

[0080] Of course, in some other embodiments, the mounting groove 2021 may also be used to install other components such as a BDU or a BMS, and the present invention is not limited to this.

[0081] In summary, the liquid inlet detection structure and battery pack provided by the present invention have the following advantages:

[0082] ① A charged conductor 3 that can conduct with the battery box 1 through the liquid is arranged in the liquid storage cavity 2011 of the insulating base 2. The detection circuit can determine the liquid ingress situation according to the charged state of the battery box 1, and then trigger an alarm or execute a preset protection measure, thereby solving the problem that the existing battery pack cannot detect liquid ingress and improving the safety performance of the battery pack;

[0083] ② The liquid storage cavity 2011 and the liquid inlet hole 2012 are designed. The liquid storage cavity 2011 provides a smaller liquid storage space, which is conducive to producing significant changes, thereby making the liquid inlet detection more sensitive and reliable, ensuring the accuracy of the detection;

[0084] ③ Install the external connector 11 and the internal connector 10 in the electrical compartment 101. Once a leak occurs, the liquid first enters the electrical compartment 101, thereby triggering the protection measures in advance to further protect the battery module;

[0085] ④ By adjusting the bottom height of the charged conductor 3, the detection sensitivity can be adjusted to meet different production and design requirements;

[0086] ⑤ The mounting base of the Hall sensor 13 and the insulating base 2 are combined into one, which reduces the number of parts and improves the compactness of the structure.

[0087] Finally, it should be noted that although the above embodiments have been described in the specification and drawings of this application, this does not limit the scope of patent protection of this application. All technical solutions generated by replacing or modifying equivalent structures or equivalent processes based on the essential concept of this application using the contents recorded in the specification and drawings of this application, as well as directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, are included in the scope of patent protection of this application.

Claims

1. A liquid inlet detection structure, characterized in that: include: A battery box (1), wherein the battery box (1) is provided with an electrical compartment (101); An insulating base (2), the insulating base (2) being installed and fixed in the electrical compartment (101); wherein the insulating base (2) is provided with a liquid storage cavity (2011) and a liquid inlet hole (2012) connecting the liquid storage cavity (2011) to the electrical compartment (101); A charged conductor (3), at least one of the charged conductors (3) extending into the liquid storage cavity (2011) along the Z direction and leaving a gap between the charged conductor and the bottom of the liquid storage cavity (2011); wherein when the liquid level in the liquid storage cavity (2011) is lower than the bottom surface of the charged conductor (3), the charged conductor (3) and the battery case (1) are in an open circuit state; and when the liquid level in the liquid storage cavity (2011) is higher than the bottom surface of the charged conductor (3), the charged conductor (3) and the battery case (1) are in a closed circuit state; A detection circuit, the detection circuit being electrically connected to the battery box (1) and being used to detect the charged state of the battery box (1).

2. The liquid inlet detection structure according to claim 1, characterized in that: The liquid inlet hole (2012) is provided on one side of the insulating base (2) along the X direction, and the position of the liquid inlet hole (2012) is higher than the side of the charged conductor (3) along the Z direction facing the bottom of the liquid storage cavity (2011).

3. The liquid inlet detection structure according to claim 1, characterized in that: A plurality of reinforcing beams (104) are provided in the electrical chamber (101), and a liquid-filled gap is left between each reinforcing beam (104) and the bottom of the chamber of the electrical chamber (101); The insulating base (2) is fixedly mounted along the Z direction on a side of one of the reinforcing beams (104) away from the inner bottom surface of the electrical compartment (101).

4. The liquid inlet detection structure according to claim 3, characterized in that: Also includes: A sealing ring (4), the sealing ring (4) being located between the insulating base (2) and the reinforcing beam (104); wherein the sealing ring (4) is provided with an inner hole (401), and the insulating base (2) is provided with a penetrating detection hole (2013) at a position corresponding to the inner hole (401).

5. The liquid inlet detection structure according to claim 1, characterized in that: It also includes an intermediate conductive copper bar (7) spanning the liquid storage cavity (2011) along the Y direction, a first end conductive copper bar (6) for electrically connecting one end of the intermediate conductive copper bar (7) to a power supply device, and a second end conductive copper bar (8) for electrically connecting the other end of the intermediate conductive copper bar (7) to a power supply device; The live conductor (3) is installed at the middle conductive copper bus (7) and is electrically connected to the middle conductive copper bus (7).

6. The liquid inlet detection structure according to claim 5, characterized in that: The live conductor (3) is threadably connected to the middle conductive copper bar (7).

7. The liquid inlet detection structure according to claim 2, characterized in that: The battery box (1) further comprises a battery compartment (102) located on one side of the electrical compartment (101) along the X direction, and a liquid cooling plate (103) located below both the electrical compartment (101) and the battery compartment (102), wherein a cooling liquid flow channel (1031) is provided in the liquid cooling plate (103); The battery box (1) is provided with an internal joint (10) connecting the coolant flow channel (1031) to the electrical compartment (101), an external joint (11) connecting the electrical compartment (101) to an external space of the battery box (1), and a connecting pipe (12) connecting the internal joint (10) and the external joint (11).

8. The liquid inlet detection structure according to claim 1, characterized in that: The insulating base (2) is provided with a mounting groove (2021) for mounting and fixing the Hall sensor (13).

9. The liquid inlet detection structure according to claim 8, characterized in that: The insulating base (2) comprises a base box body (201) provided with the liquid storage cavity (2011) and the liquid inlet hole (2012), and a box body top cover (202) connected to the top of the base box body (201) by snapping, and the box body top cover (202) is provided with the mounting groove (2021).

10. A battery pack, characterized in that: It comprises the liquid inlet detection structure as described in any one of claims 1 to 9.

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