Battery liquid leakage detection device and battery pack

Abstract

The utility model relates to a battery liquid leakage detection device and a battery pack. The battery liquid leakage detection device comprises a shell with a liquid inlet hole, and a power supply, a conductor assembly and a signal transmitter which are arranged in the shell, the power supply comprises a first electrode and a second electrode which are opposite in polarity, the signal transmitter is provided with two power connection ends opposite in polarity, and the power connection end, opposite in polarity, of the signal transmitter and the first electrode is electrically connected with the first electrode. The conductor assembly comprises a first conductor electrically connected with the second electrode and a second conductor electrically connected with the other power connection end of the signal transmitter, and the first conductor and the second conductor have a conduction state and a disconnection state. And the first conductor and the second conductor are in a conducting state, so that the power supply supplies power to the signal transmitter. The signal transmitter can transmit a liquid leakage signal indicating that the cooling liquid of the cooling system leaks to the BMS module of the battery pack when powered on, so that the safety of the battery pack can be improved.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a battery leakage detection device and a battery pack. Background Art

[0002] With the popularization of new energy vehicles, batteries are more and more widely used in vehicles. During the operation of the battery, a large amount of heat is generated, and a liquid cooling system is usually configured to cool the battery. Due to problems such as easy vibration during vehicle driving or lack of sealing of the pipe joints of the liquid cooling system, the coolant is likely to leak from the liquid cooling system into the battery. The leaked coolant directly contacts the battery modules inside the battery, resulting in a battery short circuit and reducing the battery safety. Utility Model Content

[0003] Based on this, it is necessary to provide a battery leakage detection device and a battery pack for the problem of reducing battery safety due to coolant leakage.

[0004] In a first aspect, this application provides a battery leakage detection device for detecting the leakage of the cooling system in a battery pack, including:

[0005] A housing having a liquid inlet hole;

[0006] A power source, a conductor assembly, and a signal transmitter, all disposed inside the housing; the power source includes a first electrode and a second electrode with opposite polarities, and the signal transmitter has two power connection terminals with opposite polarities; one of the power connection terminals of the signal transmitter with opposite polarity to the first electrode is electrically connected to the first electrode;

[0007] The conductor assembly includes a first conductor electrically connected to the second electrode and a second conductor electrically connected to the other power connection terminal of the signal transmitter. There are two states between the first conductor and the second conductor: a conducting state or a disconnected state. When the coolant leaked from the cooling system enters the housing through the liquid inlet hole, the first conductor and the second conductor are in a conducting state, so that the power source supplies power to the signal transmitter;

[0008] The signal transmitter can transmit a leakage signal indicating that there is coolant leakage in the cooling system to the BMS module of the battery pack when it is powered on.

[0009] In some embodiments, the housing includes a base, the power source, the conductor assembly, and the signal transmitter are all installed on the base, and the liquid inlet hole is provided on the base;

[0010] The first conductor and the second conductor are arranged at intervals.

[0011] In some embodiments, at least partially opposite first and second channels are formed in the base, and the liquid inlet hole separates and communicates the first and second channels;

[0012] The first conductor is embedded in the first channel, and the second conductor is embedded in the second channel.

[0013] In some embodiments, a mounting groove and an insertion port are formed in the base, the insertion port is arranged opposite to the notch of the mounting groove and communicates with the outside of the base;

[0014] The insertion port is for the power supply to be inserted from the outside of the base into the mounting groove.

[0015] In some embodiments, the battery leakage detection device further includes a power supply clamping member, one end of the power supply clamping member is connected to the power supply, and the other end is clamped to the base.

[0016] In some embodiments, the power supply clamping member includes a mating portion, a hook portion and a connecting portion, and the connecting portion connects the mating portion and the hook portion;

[0017] The base is provided with a first card hole and an avoidance groove, the avoidance groove opens towards the outside of the base and communicates between the first card hole and the insertion port, the connecting portion is arranged in the avoidance groove, the hook portion passes through the first card hole and hooks the inner side of the base, and the mating portion passes through the insertion port and mates with the power supply.

[0018] In some embodiments, a third channel is further formed in the base, and the third channel communicates with the mounting groove;

[0019] The conductor assembly further includes a third conductor, the third conductor is embedded in the third channel and electrically connects the signal transmitter and the first electrode.

[0020] In some embodiments, a groove portion is formed on the signal transmitter, and part of the second conductor is installed in the groove portion and electrically connected to the signal transmitter.

[0021] In some embodiments, the housing further includes a cover body, the base has an open end, and the cover body is detachably covered on the open end of the base.

[0022] In a second aspect, the present application provides a battery pack, including:

[0023] The battery leakage detection device according to any one of the above embodiments;

[0024] A battery module;

[0025] A BMS module, connected to the battery module; and

[0026] A cooling system for performing heat exchange treatment on the battery module;

[0027] The signal transmitter is communicatively connected to the BMS module and is configured to transmit a liquid leakage signal indicating that there is a coolant leakage in the cooling system to the BMS module.

[0028] Compared with the prior art, the present application has the following beneficial effects:

[0029] In the above battery liquid leakage detection device and battery pack, when there is a coolant leakage in the cooling system within the battery pack, the coolant enters the housing through the liquid inlet hole on the housing, causing the first conductor and the second conductor to be immersed in the coolant. Under the conduction of the coolant, the first conductor and the second conductor are in a conductive state, enabling the current loop where the power supply and the signal transmitter are located to be conducted, and the power supply supplies power to the signal transmitter. The energized signal transmitter can transmit a liquid leakage signal to the BMS module inside the outer battery pack. This liquid leakage signal can be used to alert that there is a coolant leakage in the cooling system within the battery pack, playing a role of reminder and warning, facilitating maintenance by the staff, and improving the safety of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered to be a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0031] Figure 1 It is a system schematic diagram of a battery pack for some embodiments.

[0032] Figure 2 It is a schematic diagram of the principle of a battery liquid leakage detection device for some embodiments.

[0033] Figure 3 It is an external shape schematic diagram of a battery liquid leakage detection device for some embodiments.

[0034] Figure 4 For Figure 3 The internal structure schematic diagram of the battery liquid leakage detection device shown.

[0035] Figure 5 It is an exploded view of the battery liquid leakage detection device shown in FIG. 2.

[0036] Figure 6 For Figure 5 The cross-sectional view of the structure shown.

[0037] Figure 7 It is a schematic diagram of the base of a battery liquid leakage detection device for some embodiments.

[0038] The reference numerals in the specific embodiments are as follows:

[0039] 1000, battery pack; 100, battery leakage detection device; 10, housing; 11, base; T1, first channel; T2, second channel; T3, third channel; C, mounting groove; k1, insertion port; k2, first card hole; k3, avoidance groove; k4, second card hole; k5, fastening hole; J, liquid inlet hole; 11a, boss; 11b, outer frame; 12, cover; 12a, buckle; 20, power supply; 21, first electrode; 22, second electrode; 30, conductor assembly; 31, first conductor; 32, second conductor; 33, third conductor; 40, signal transmitter; 41, plate body; 41a, groove part; 42, signal emitting part; 50, power supply clamping part; 51, mating part; 52, hook part; 53, connecting part; 60, fastener; 200, battery module; 300, BMS module; 400, cooling system. Specific embodiments

[0040] In order to make the above objects, features, and advantages of the present application more apparent and understandable, the following detailed description of the specific embodiments of the present application will be made in conjunction with the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0041] In the description of the present application, it should be understood that if present, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application.

[0042] In addition, if present, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0043] In this application, unless otherwise clearly defined and limited, if the terms "installed", "connected", "linked", "fixed", etc. appear, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0044] In this application, if it appears, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature is at a higher horizontal level than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature is at a lower horizontal level than the second feature.

[0045] It should be noted that if it appears, when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0046] In response to the problems raised in the background art, an embodiment of this application provides a battery leakage detection device that can be used to detect whether a coolant leakage occurs in a battery pack, and a battery pack including the battery leakage detection device.

[0047] Refer to Figure 1 , the battery pack 1000 provided by the embodiment of this application includes a battery leakage detection device 100, a battery module 200, a BMS module 300, and a cooling system 400. The cooling system 400 is used to perform heat exchange processing on the battery module 200. The battery leakage detection device 100 is communicatively connected to the BMS module 300 and is used to transmit a leakage signal indicating that a coolant leakage has occurred in the cooling system 400 to the BMS module 300.

[0048] Among them, the battery module 200 generally includes multiple battery cells. A battery cell is the smallest unit for electrochemical reactions in the battery pack 1000. In some examples, a battery cell includes a housing, and an electrode assembly and an electrolyte accommodated in the housing, etc. The housing can be an aluminum shell, a steel shell, etc., and the specific material is not limited. The electrode assembly includes a positive electrode plate, a negative electrode plate, and a separator insulatingly isolated between the positive electrode plate and the negative electrode plate. The separator can be a separator membrane that allows ions to pass through. The electrode assembly can be a stacked structure or a wound structure. In some examples, a liquid injection hole for injecting the electrolyte into the housing is provided on the housing. Generally, a pole column is also provided on the housing, and the pole column is electrically connected to the electrode assembly to connect the electrode assembly to an external circuit.

[0049] The BMS module 300 (Battery Management System) is a system for monitoring, evaluating, controlling, and managing the battery, ensuring the safe, efficient, and balanced operation of the battery pack, extending the battery life, and providing accurate battery state information. Specifically, a signal receiver can be set on the BMS module 300. The signal receiver is paired with the signal transmitter 40 and can receive the leakage signal fed back by the signal transmitter 40. When the BMS module 300 receives the leakage signal, it can feedback to an electrical device such as a vehicle using the battery pack 1000 that there is a leakage abnormality in the battery pack 1000.

[0050] The cooling system 400 is used for heat exchange with the battery module 200. In one embodiment, the cooling system 400 includes a liquid cooling plate. The liquid cooling plate can be arranged at the bottom, top, or side of the battery module 200, etc., and a coolant can flow through it, and heat exchange is carried out between the coolant and the battery module 200. The battery leakage detection device 100 in the embodiment of the present application can emit a leakage signal to the BMS module 300 when there is a coolant leakage in the cooling system 400.

[0051] Regarding the specific structures of the battery module 200, the BMS module 300, and the cooling system 400, please refer to the conventional settings and are not limited herein.

[0052] The battery leakage detection device 100 in the embodiment of the present application will be introduced in detail below.

[0053] Please refer to Figure 2 、 Figure 3 and Figure 4, the battery leakage detection device 100 provided by the embodiment of the present application includes a housing 10, a power supply 20, a conductor assembly 30, and a signal transmitter 40. The housing 10 has a liquid inlet hole J. The power supply 20, the conductor assembly 30, and the signal transmitter 40 are all arranged inside the housing 10. The power supply 20 includes a first electrode 21 and a second electrode 22 with opposite polarities. The signal transmitter 40 has two power connection terminals with opposite polarities. One power connection terminal of the signal transmitter 40 with the opposite polarity to the first electrode 21 is electrically connected to the first electrode 21. The conductor assembly 30 includes a first conductor 31 electrically connected to the second electrode 22 and a second conductor 32 electrically connected to the other power connection terminal of the signal transmitter 40. There are two states between the first conductor 31 and the second conductor 32: conduction or disconnection. When the coolant leaked from the cooling system 400 enters the housing 10 through the liquid inlet hole J, the first conductor 31 and the second conductor 32 are in a conductive state, so that the power supply 20 supplies power to the signal transmitter 40. The signal transmitter 40 can transmit a leakage signal indicating that there is a coolant leakage in the cooling system 400 to the BMS module 300 of the battery pack 1000 when powered on.

[0054] In practical applications, the battery leakage detection device 100 is arranged inside the battery pack 1000 and is usually arranged at the bottom of the battery pack 1000. The liquid inlet hole J is usually arranged at the bottom of the housing 10, which is convenient for the coolant to enter the housing 10 more smoothly and quickly even when the amount of leaked coolant is small.

[0055] The first electrode 21 and the second electrode 22 have opposite polarities, one of which is the positive electrode and the other is the negative electrode. The signal transmitter 40 can transmit a wireless signal when powered on. Its specific type is not limited here, and those skilled in the art can flexibly set it according to actual needs. The signal transmitter 40 has two power connection terminals with opposite polarities. One power connection terminal is electrically connected to the first electrode and has the opposite polarity to the first electrode 21, and the other power connection terminal is electrically connected to the second conductor 32.

[0056] The first conductor 31 and the second conductor 32 are used to transmit current and have conductivity, and can be but are not limited to metal materials. The first conductor 31 and the second conductor 32 are located on the current loop where the power supply 20 and the signal transmitter 40 are located, and there are two states between them: a conductive state for conducting the current loop or a disconnected state for disconnecting the current loop. When they are in the conductive state, the power supply 20 is allowed to supply power to the signal transmitter 40. When they are in the disconnected state, the power supply 20 cannot supply power to the signal generator 40.

[0057] Specifically, when there is no coolant leakage in the cooling system 400 and no coolant enters the housing 10, the first conductor 31 and the second conductor 32 are in a disconnected state, the current loop where the power supply 20 and the signal transmitter 40 are located is truncated, and the power supply 20 cannot supply power to the signal transmitter 40.

[0058] When the cooling system 400 has a coolant leak, the coolant enters the housing 10 through the liquid inlet hole J on the housing 10, causing the first conductor 31 and the second conductor 32 to be immersed in the coolant. Under the conduction of the coolant, the first conductor 31 and the second conductor 32 are in an electrically conductive state, enabling the current loop where the power supply 20 and the signal transmitter 40 are located to be conducted, and the power supply 20 can supply power to the signal transmitter 40. The energized signal transmitter 40 can transmit a liquid leakage signal to the BMS module 300. This liquid leakage signal can be used to indicate the occurrence of coolant leakage in the cooling system 400, serving as a reminder and warning, facilitating maintenance by the staff, and improving the safety of the battery pack 1000.

[0059] In some embodiments, the first conductor 31 and the second conductor 32 are arranged at intervals.

[0060] The first conductor 31 and the second conductor 32 are arranged at intervals and do not come into direct contact. At this time, when the coolant does not enter the housing 10, the first conductor 31 and the second conductor 32 are insulated by air and in an open state. In this way, the insulation of the first conductor 31 and the second conductor 32 is simple and easy to implement.

[0061] Of course, in other embodiments, an insulating member can also be provided between the first conductor 31 and the second conductor 32 to connect the two.

[0062] In some embodiments, the housing 10 includes a base 11, and the power supply 20, the conductor assembly 30, and the signal transmitter 40 are all installed on the base 11, and the liquid inlet hole J is provided on the base 11.

[0063] Specifically, the liquid inlet hole J is provided at the bottom of the base 11 and extends upward, facilitating the entry of the coolant. At this time, the base 11 is located below the housing 10, and the liquid inlet hole J is provided on the base 11. When a small amount of coolant leaks, it can also enter the housing 10 to conduct the first conductor 31 and the second conductor 32. In this way, the leakage monitoring of the coolant is more timely.

[0064] In some embodiments, referring to Figure 4 and Figure 6 , at least partially opposite first channels T1 and second channels T2 are formed in the base 11, and the liquid inlet hole J separates and connects the first channels T1 and the second channels T2. The first conductor 31 is embedded in the first channel T1, and the second conductor 32 is embedded in the second channel T2.

[0065] In practical applications, the base 11 can be made of insulating plastic material. The first conductor 31 and the second conductor 32 can be embedded in the base 11 and integrally injection-molded with the base 11. The position where the first conductor 31 is located is the first channel T1, and the position where the second conductor 32 is located is the second channel T2. The liquid inlet hole J is arranged between the first channel T1 and the second channel T2 and separates the two. When the coolant enters the liquid inlet hole J, the coolant in the liquid inlet hole J can form a conductor to electrically connect the first conductor 31 and the second conductor 32.

[0066] At this time, the first conductor 31 and the second conductor 32 can be integrally injection-molded in the base 11, with a fast molding speed and low cost. Moreover, the first conductor 31 and the second conductor 32 are embedded in the base 11, and their installation reliability is high.

[0067] In some embodiments, referring to Figure 5 and Figure 6 , an installation groove C and an insertion port k1 are formed in the base 11. The insertion port k1 is arranged opposite to the notch of the installation groove C and communicates with the outside of the base 11. The insertion port k1 is for the power supply 20 to be inserted from the outside of the base 11 into the installation groove C.

[0068] The insertion port k1 communicates the inside and outside of the base 11. The installation groove C is used to install the power supply 20 and is located inside the base 11. In practical applications, the power supply 20 can be inserted into the installation groove C from the outside of the base 11 through the notch of the installation groove C via the insertion port k1. When the power supply 20 is inserted in place, the second electrode 22 of the power supply 20 can be electrically connected to the second conductor 32 embedded in the base 11. The installation groove C and the insertion port k1 can be formed in the base 11 during the injection molding of the base 11, or can be formed in the base 11 by mechanical processing later.

[0069] At this time, the power supply 20 can be inserted on the base 11 from the outside of the base 11, which is convenient to operate.

[0070] In some embodiments, the battery leakage detection device 100 further includes a power supply clamping member 50. One end of the power supply clamping member 50 is connected to the power supply 20, and the other end is clamped to the base 11.

[0071] One end of the power supply clamping member 50 is connected to the power supply 20, and the other end is used to be clamped to the base 11 to enhance the connection strength between the power supply 20 and the base 11 and improve the safety and reliability of the power supply 20. Among them, the power supply clamping member 50 and the power supply 20 can be fixedly connected, clamped, integrally connected, etc.

[0072] Specifically in the embodiment, referring to Figure 4 , Figure 5 and Figure 6, the power supply connector 50 includes a mating portion 51, a hook portion 52, and a connecting portion 53. The connecting portion 53 connects the mating portion 51 and the hook portion 52. A first card hole k2 and an avoidance groove k3 are provided on the base 11. The avoidance groove k3 opens towards the outside of the base 11 and communicates between the first card hole k2 and the insertion port k1. The connecting portion 53 is disposed in the avoidance groove k3. The hook portion 52 passes through the first card hole k2 and hooks the inner side of the base 11. The mating portion 51 is mated with the insertion port k1 and connects to the power supply 20.

[0073] The first card hole k2 penetrates through the inside and outside of the base 11. The hook portion 52 can be snapped into the inside of the base 11 from the outside of the base 11 through the first card hole k2 to hook the base 11, realizing the snap connection between the power supply 20 connector and the base 11. The connecting portion 53, as the connection hub between the mating portion 51 and the snap connection portion, is received in the avoidance groove k3 to avoid being exposed outside the base 11 and affecting the appearance. The mating portion 51 can be connected to the power supply 20 by means of snap connection, fastening connection, integral connection, etc. The fitting portion can pass through the insertion port k1 and be mated with the insertion port k1 to realize the sealing of the insertion port k1.

[0074] In actual application, the power supply 20 and the power supply connector 50 are assembled together, and then the power supply 20 is inserted into the installation groove C from the insertion port k1. When the power supply 20 is inserted in place, the mating portion 51 is located in the insertion port k1 and closes the insertion port k1, preventing the coolant from eroding the power supply 20 through the insertion port k1 and affecting the use of the power supply 20. At the same time, the connecting portion 53 is snapped into the avoidance groove k3, and the hook portion 52 is snapped into the first card hole k2 to realize the snap connection between the power supply connector 50 and the base 11.

[0075] Regarding the specific structure of the power supply connector 50, it is not limited to the above method, and those skilled in the art can make other conventional settings based on conventional means.

[0076] In some embodiments, referring to Figure 4 and Figure 6 , a third channel T3 is further formed in the base 11. The third channel T3 communicates with the installation groove C. The conductor assembly 30 further includes a third conductor 33. The third conductor 33 is embedded in the third channel T3 and electrically connects the signal transmitter 40 and the first electrode 21.

[0077] The third conductor 33 has conductivity and can be, but is not limited to, a metal material. In actual application, the third conductor 33 can be integrally injection-molded with the base 11, and the position where the third conductor 33 is located is the third channel T3.

[0078] At this time, the circuit connection between the power supply 20 and the signal transmitter 40 is realized by using the first conductor 31, the second conductor 32, and the third conductor 33. There is no need for complicated wire connection, and the layout is simple, which can improve the production efficiency of the battery leakage detection device 100. In actual application, only by installing the power supply 20 in the installation groove C, the electrical connection between the power supply 20 and the first conductor 31 and the third conductor 33 can be realized, and the assembly efficiency of the battery leakage detection device 100 is relatively fast.

[0079] In some embodiments, in combination with Figure 5 and Figure 4 it is understood that a groove portion 41a is formed on the signal transmitter 40, and a part of the second conductor 32 is installed in the groove portion 41a and is electrically connected to the signal transmitter 40.

[0080] It can be understood that the groove portion 41a is located at the power connection end of the signal transmitter 40. A part of the second conductor 32 is directly inserted into the groove portion 41a at the corresponding power connection end, thereby realizing the electrical connection with the signal transmitter 40. In this way, the contact area between the second conductor 32 and the signal transmitter 40 is relatively large, and the electrical connection is reliable.

[0081] Similarly, a part of the third conductor 33 can also be inserted into the groove portion 41a at the other power connection end of the signal transmitter 40, thereby realizing the electrical connection with the signal transmitter 40.

[0082] In a specific example, the base 11 includes an outer frame 11b and a boss 11a located inside the outer frame 11b. The boss 11a and the outer frame 11b can be integrally formed. A first channel T1, a second channel T2, a third channel T3, and an installation groove C are formed on the boss 11a. The liquid inlet hole J penetrates through the outer frame 11b and extends into the boss 11a. The insertion port k1, the first clamping hole k2, and the avoidance groove k3 can be provided on the outer frame 11b.

[0083] In a specific example, referring to Figure 7 and in combination with Figures 4 to 6 the signal transmitter 40 is installed on the surface of the boss 11a of the base 11 and is fixed on the boss 11a by a fastener 60 such as a screw. For example, a fastening hole k5 is provided on the boss 11a, and the fastener 60 is installed in the fastening hole k5 to lock the signal transmitter 40 on the boss 11a.

[0084] It is possible to refer to Figure 5, the signal transmitter 40 includes a board body 41 and a signal transmitting portion 42. A printed circuit is provided on the board body 41, and the signal transmitting portion 42 is electrically connected to the first conductor 31 and the third conductor 33 through the printed circuit. The groove portion 41a in the above embodiment can penetrate the printed circuit of the board body 41 to be electrically connected to the printed circuit, so that the second conductor 32 and the third conductor 33 are connected to the signal transmitting portion 42 through the printed circuit. The signal transmitting portion 42 is used to transmit a liquid leakage signal, which can be a Bluetooth signal transmitting chip, a WIFI signal transmitting chip, a 4G signal transmitting chip, etc., and the specific type can be set conventionally.

[0085] In some embodiments, referring to Figure 6 , the housing 10 further includes a cover body 12. The base 11 has an open end, and the cover body 12 is detachably covered on the open end of the base 11.

[0086] Specifically, the cover body 12 and the base 11 can be detachably connected by a snap connection method. For example, a second snap hole k4 is provided on the base 11, and a snap 12a is provided on the cover body 12. The snap 12a is detachably snapped with the second snap hole 14.

[0087] At this time, the housing 10 is detachably connected by the base 11 and the cover body 12, which is convenient for overhauling the internal devices.

[0088] It can be understood that the battery pack 1000 provided by the embodiment of the present application includes all the beneficial effects of the battery liquid leakage detection device 100 in the above embodiment.

[0089] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0090] The above embodiments only represent several implementation manners of the present application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A battery leakage detection device (100), used to detect leakage of a cooling system (400) in a battery pack (1000), characterized in that: include: A housing (10) having a liquid inlet hole (J); A power source (20), a conductor assembly (30) and a signal transmitter (40) are all arranged in the housing (10); the power source (20) comprises a first electrode (21) and a second electrode (22) of opposite polarities, and the signal transmitter (40) has two power terminals of opposite polarities; one power terminal of the signal transmitter (40) having a polarity opposite to that of the first electrode (21) is electrically connected to the first electrode (21); The conductor assembly (30) comprises a first conductor (31) electrically connected to the second electrode (22), and a second conductor (32) electrically connected to the other electrical terminal of the signal transmitter (40), and the first conductor (31) and the second conductor (32) have two states of being on or off; When the coolant leaked from the cooling system (400) enters the housing (10) through the liquid inlet hole (J), the first conductor (31) and the second conductor (32) are in a conductive state, so that the power supply (20) supplies power to the signal transmitter (40), and the signal transmitter (40) can transmit a leakage signal indicating that the coolant in the cooling system (400) is leaking to the BMS module (300) of the battery pack (1000) when powered on.

2. The battery leakage detection device (100) according to claim 1, characterized in that: The housing (10) comprises a base (11), the power source (20), the conductor assembly (30) and the signal transmitter (40) are all installed on the base (11), and the liquid inlet (J) is provided on the base (11); The first conductor (31) and the second conductor (32) are arranged at intervals.

3. The battery leakage detection device (100) according to claim 2, characterized in that: A first channel (T1) and a second channel (T2) are formed in the base (11) and are at least partially arranged opposite to each other, and the liquid inlet hole (J) separates and connects the first channel (T1) and the second channel (T2); The first conductor (31) is embedded in the first channel (T1), and the second conductor (32) is embedded in the second channel (T2).

4. The battery leakage detection device (100) according to claim 3, characterized in that: A mounting groove (C) and an insertion opening (k1) are formed in the base (11); the insertion opening (k1) is arranged opposite to the notch of the mounting groove (C) and is connected to the outside of the base (11); The insertion port (k1) is used for the power source (20) to be inserted from the outside of the base (11) into the installation slot (C).

5. The battery leakage detection device (100) according to claim 4, characterized in that: The battery leakage detection device (100) further comprises a power supply clamping component (50), one end of which is connected to the power supply (20) and the other end of which is clamped to the base (11).

6. The battery leakage detection device (100) according to claim 5, characterized in that: The power supply connector (50) comprises a matching portion (51), a hook portion (52) and a connecting portion (53), wherein the connecting portion (53) connects the matching portion (51) and the hook portion (52); The base (11) is provided with a first latch hole (k2) and an avoidance groove (k3); the avoidance groove (k3) opens toward the outside of the base (11) and is connected between the first latch hole (k2) and the insertion port (k1); the connecting portion (53) is provided in the avoidance groove (k3); the hook portion (52) passes through the first latch hole (k2) and hooks the inner side of the base (11); the matching portion (51) is matched with the insertion port (k1) and connected to the power supply (20).

7. The battery leakage detection device (100) according to claim 4, characterized in that: A third channel (T3) is also formed in the base (11), and the third channel (T3) is connected to the mounting groove (C); The conductor assembly (30) further comprises a third conductor (33), wherein the third conductor (33) is embedded in the third channel (T3) and electrically connects the signal transmitter (40) and the first electrode (21).

8. The battery leakage detection device (100) according to claim 2, characterized in that: The signal transmitter (40) is provided with a groove (41a), and part of the second conductor (32) is installed in the groove (41a) and is electrically connected to the signal transmitter (40).

9. The battery leakage detection device (100) according to claim 2, characterized in that: The shell (10) further comprises a cover (12); the base (11) has an open end; and the cover (12) is detachably covered on the open end of the base (11).

10. A battery pack (1000), characterized in that: include: A battery leakage detection device (100) as claimed in any one of claims 1 to 9; A battery module (200); A BMS module (300) connected to the battery module (200); and A cooling system (400) for performing heat exchange processing on the battery module (200); The signal transmitter (40) is communicatively connected to the BMS module (300) and is used to transmit a leakage signal indicating a coolant leakage in the cooling system (400) to the BMS module (300).

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