CN220691075U - Liquid leakage detection device and battery - Google Patents

Abstract

The embodiment of the application relates to the field of batteries and provides a leakage detection device and a battery. The leakage detection device comprises a plurality of sampling points which are arranged on an insulating base below the battery cell at intervals; the battery management system is electrically connected with the plurality of sampling points and is used for detecting resistance change among the plurality of sampling points, the sampling points are arranged on the insulating base of the battery at intervals, the battery management system inside the battery is used for connecting the sampling points, under the condition that liquid leakage occurs in the battery, the resistance between the sampling points can be changed, the battery management system can detect the resistance change, so that the condition that liquid leakage exists in the battery is determined, the sampling points are only required to be arranged on the insulating base of the battery, and the resistance change between the sampling points is detected by the battery management system inside the battery, so that the liquid leakage state of the battery core can be accurately detected, and the implementation cost can be effectively reduced.

Description

Liquid leakage detection device and battery

Technical Field

The application relates to the technical field of batteries, in particular to a liquid leakage detection device and a battery.

Background

Batteries typically include electrolyte and therefore there is a risk of leakage which can affect the operational safety of the battery. Therefore, it is necessary to detect whether the battery leaks.

The current leakage detection mode generally adopts a mode of adding a sensor outside a battery core of a battery to realize detection, however, the detection mode has higher realization cost; the detection accuracy is insufficient if the sensor is not provided and only the operation parameters such as the temperature and the voltage of the battery cell are used for detection.

In view of the foregoing, there is a need to provide a leakage detection scheme that can save costs and accurately detect the leakage condition of a battery.

Disclosure of Invention

The application provides a weeping detection device and battery can provide a battery weeping detection scheme of low cost, high reliability, can effectively reduce the realization cost of battery weeping detection, improves the degree of accuracy that battery weeping detected.

In order to achieve the above purpose, the present application adopts the following technical scheme:

in a first aspect, there is provided a leakage detection device including: the plurality of sampling points are arranged on the insulating base below the battery cell at intervals;

and the battery management system is electrically connected with the plurality of sampling points and is used for detecting the resistance change among the plurality of sampling points.

In this embodiment of the present application, when the electrolyte of the battery cell in the battery leaks, the leaked electrolyte will flow to the insulating base below the battery cell due to the gravity. Through being provided with a plurality of sample points in insulating base interval, when the electrolyte that leaks flows to insulating base on, the electrolyte can make the resistance between two sample points change, becomes the resistance corresponding with the resistance of electrolyte by the resistance of open circuit, and whether the battery management system through the battery inside just can accurately confirm whether the leakage of electrolyte takes place for the electric core in the battery to the resistance between any two sample points change to realize effectively detecting the battery and take place the leakage, reduce implementation cost.

In an implementation manner of the first aspect, the insulating base is provided with a groove, and the plurality of sampling points are directly fixed in the groove.

In this embodiment of the application, because the position of recess is in the below, consequently in the battery takes place the condition that electrolyte leaked, the electrolyte that leaks can flow to the recess in to make the sampling point that sets up in the recess can contact the electrolyte that leaks and make between two at least sampling points by the intercommunication even take place the short circuit, make battery management system can detect the resistance change condition between the sampling point, effectively improve the detection sensitivity to the weeping condition.

In an implementation manner of the first aspect, the plurality of sampling points are fixed in the groove by an adhesive manner. In an implementation manner of the first aspect, the plurality of sampling points are disposed on the insulating base at equal intervals.

In this embodiment of the application, equidistant sampling point that sets up for under the condition that any electric core takes place the weeping in the battery, the sampling point can be by the electrolyte intercommunication and the short circuit of leaking, thereby can detect the resistance change, improves the sensitivity that the weeping detected.

In an implementation manner of the first aspect, positions of the plurality of sampling points are set according to positions of the battery cells.

In this embodiment of the application, according to the position setting sampling point's of electric core position for under the condition that any electric core takes place the weeping in the battery, can be by the electrolyte intercommunication and the short circuit that leak between the sampling point of the corresponding position in below of the electric core of weeping take place, thereby can detect the resistance change, improve the sensitivity that the weeping detected.

In one implementation of the first aspect, the plurality of sampling points are electrically connected to the battery management system by wires.

In the embodiment of the application, the battery management system and the sampling point are connected through the lead, so that reliable signal transmission can be provided, and the implementation cost is optimized.

In one implementation manner of the first aspect, the battery management system includes:

the voltage sampling unit is used for collecting voltage values corresponding to the communication condition between any two sampling points;

and the power supply unit is connected with the plurality of sampling points and is used for providing preset voltage.

In an implementation manner of the first aspect, the battery management system further includes:

the resistance value calculation unit is used for calculating an equivalent resistance value between the sampling points according to the acquired voltage values;

and the detection unit is used for judging whether electrolyte leakage occurs according to the equivalent resistance value.

In the embodiment of the application, whether the electrolyte leakage or other solution leakage occurs is further judged by detecting the equivalent resistance value, so that the situation that the cooling liquid in the battery leaks can be reduced and mistakenly identified as the battery leakage, and the identification accuracy is improved.

In one implementation of the first aspect, the voltage divider device includes a sampling resistor.

In a second aspect, there is provided a battery comprising the leakage detection device according to any one of the first aspects and an electrical cell.

Sampling points in the liquid leakage detection device are arranged below the battery cell.

It will be appreciated that the advantages of the second aspect may be found in the relevant description of the first aspect, and will not be described in detail herein.

The foregoing description is only an overview of the technical solutions of the present application, and may be implemented according to the content of the specification in order to make the technical means of the present application more clearly understood, and in order to make the above-mentioned and other objects, features and advantages of the present application more clearly understood, the following detailed description of the present application will be given.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the accompanying drawings. In the drawings:

fig. 1 is a schematic structural view of a battery provided in some embodiments of the present application;

FIG. 2 is a schematic illustration of a vehicle provided in some embodiments of the present application;

fig. 3 is a schematic structural diagram of a leak detection device provided in an embodiment of the present application;

fig. 4 is a schematic structural diagram of a battery management system in the leakage detection device according to the embodiment of the present application;

FIG. 5 is a schematic view of a leakage detection device according to other embodiments of the present disclosure;

FIG. 6 is a schematic structural diagram of a leakage detection device according to other embodiments of the present disclosure;

fig. 7 is a schematic structural diagram of a leak detection apparatus according to other embodiments of the present disclosure.

Detailed Description

Embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical solutions of the present application, and thus are only examples, and are not intended to limit the scope of protection of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first," "second," etc. are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is merely an association relationship describing an association object, which means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two), and "plural sheets" refers to two or more (including two).

In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to the specific circumstances.

In order to more clearly illustrate the technical scheme of the application, the concepts related to the application are described as follows:

a cell, which is a basic unit device that directly converts chemical energy into electrical energy, generally includes: an electrode, a separator, an electrolyte, a housing, and a terminal. In an embodiment of the present application, the electrolyte of the foregoing electrical cell may include an electrolyte.

The battery module is a device which is formed by combining more than one electric core in a serial, parallel or serial-parallel mode and only has a pair of positive and negative output terminals.

The battery can comprise a box body, a battery module and a battery management system module, wherein the battery module and the battery management system module are accommodated in the box body, and the battery is electrically connected with an electric element and an interface connected with the outside.

Referring to fig. 1, fig. 1 shows a schematic structure of a battery according to an embodiment of the present application. As shown in fig. 1, the battery 100 may include a battery module 110, where the battery module 110 includes more than one battery cell 111; a fastening case 120 for fixing the battery cell 111, the fastening case 120 may include a fastening upper case 121 and a fastening lower case 122; a base 130, and a battery management system (Battery Management System, BMS) 140.

Since the battery has a risk of electrolyte leakage, it is necessary to detect whether the electrolyte of the battery leaks or not in order to improve the safety of the battery operation. The current leakage detection of the battery generally adopts the following two modes:

in the mode 1, various sensors (such as a leakage sensor, an insulation resistance sensor, and a current sensor) are arranged outside the battery cell to detect whether the battery leaks.

And 2, measuring and calculating whether the battery leaks according to the temperature and voltage parameters of the battery core.

However, although the implementation cost of the mode 2 is low, the temperature and voltage change of the battery core may be caused by other reasons, and the detection mode of measuring whether the battery leaks or not is only measured by the temperature and voltage parameters of the battery core, so that the problems of high false detection rate and insufficient detection accuracy exist.

Based on the above-mentioned problem, this embodiment of the application provides a weeping detection device, set up the sample point that a plurality of intervals set up on the insulating base through the battery, utilize the inside battery management system of battery to connect the sample point, under the condition that the weeping appears in the battery, resistance between the sample point can change, battery management system just can detect this resistance change, thereby confirm that the battery exists the condition of weeping, only need set up the sample point at the insulating base of battery, and utilize the inside battery management system of battery to detect the resistance change between the sample point, can accurately detect the weeping state of electric core, can reduce implementation cost effectively again.

The battery disclosed by the embodiment of the application can be used for an electric device using the battery as a power supply or various energy storage systems using the battery as an energy storage element. The electrical device may be, but is not limited to, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among other things, spacecraft may include airplanes, rockets, space shuttles, spacecraft, and the like.

For convenience of description, the following embodiment will take an electric device according to an embodiment of the present application as an example of the vehicle 1000.

Referring to fig. 2, fig. 2 illustrates a schematic structure of a vehicle 1000 according to some embodiments of the present application. The vehicle 1000 may be a new energy vehicle, which may be a pure electric vehicle, a hybrid vehicle, or an extended range vehicle. The battery 100 is provided in the interior of the vehicle 1000, and the battery 100 may be provided at the bottom or the head or the tail of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000, for example, the battery 100 may be used as an operating power source of the vehicle 1000.

In some embodiments of the present application, battery 100 may not only serve as an operating power source for vehicle 1000, but may also serve as a driving power source for vehicle 1000, instead of or in part instead of fuel oil or natural gas, to provide driving power for vehicle 1000.

In some embodiments of the present application, the battery 100 may include a battery cell or a battery module. The plurality of electric cores can be connected in series or in parallel, and the series-parallel connection means that the plurality of electric cores are connected in series or in parallel. The multiple electric cores can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the multiple electric cores is accommodated in the box body; the battery modules are connected in series, in parallel or in series-parallel to form a whole and are accommodated in the box body. Battery 100 may also include other structures such as a secure housing and an insulating base for the cells.

Wherein each cell may include a secondary battery or a primary battery; lithium sulfur batteries, sodium ion batteries, or magnesium ion batteries may also be included. The battery cell can be in a cylinder, a flat body, a cuboid or other shapes, etc.

Of course, the vehicle 1000 described above may also include the battery management system 140 and the motor 300. The main functions of the battery management system (Battery Management System, BMS) 200 are battery parameter monitoring, battery state estimation, on-line fault diagnosis, charge control, automatic balancing, thermal management, etc.

In this embodiment of the present application, the battery management system 140 is integrated in the battery 100 and is connected with the sampling points set in the insulating base of the battery 100, so as to detect the resistance change between the sampling points, and further realize the detection function of the leakage detection device provided in this embodiment of the present application.

The following describes a leak detection apparatus provided in an embodiment of the present application with reference to the accompanying drawings:

referring to fig. 3, fig. 3 illustrates a schematic structure of a leak detection apparatus provided in an embodiment of the present application. As shown in fig. 3, the leakage detection device may include a plurality of sampling points 21, for example, 2, 3, 4, 6, 8, etc., where the plurality of sampling points 21 are disposed on the insulating base 130 below the battery cell 111 at intervals; in particular, the sampling points 21 are directly fixedly connected to the insulating base 130, for example by means of adhesive bonding, whereby the sampling points can be arranged in a simple and effective manner. The plurality of sampling points 12 are electrically connected to the battery management system 140 of the battery 100.

The battery management system 140 may detect a change in resistance between different sampling points 21.

In the embodiment of the present application, the above-mentioned detection of the change in the resistance value between the different sampling points 21 by the battery management system 140 may be the detection of the change in the resistance value between any two sampling points 21.

In a specific application, the plurality of sampling points 21 may be electrically connected to the battery management system 140 through a wire, so as to achieve reliable electrical connection, so that the battery management system 140 can detect whether the electrolyte leakage exists in the battery in real time.

In a specific application, the battery management system 140 may detect the resistance change condition between any two sampling points 21, and if the resistance change condition between one set of sampling points (i.e. a certain two sampling points 21) meets the requirement, the condition that the electrolyte leaks in the battery can be determined.

In a specific application, the condition that the resistance value between the two sampling points 21 is changed according to the requirement means that the resistance between the two sampling points is changed from infinite corresponding to open circuit to a resistance value corresponding to the resistance value when the two sampling points 21 are communicated with the electrolyte.

It will be appreciated that the materials of the different electrolytes are different, so that the corresponding resistances when the two sampling points 21 are connected are also different.

In particular applications, the insulating base includes, but is not limited to, plastic bases, rubber bases, and the like.

As can be seen from the above, when the electrolyte of the battery cell 111 in the battery 100 leaks, the leaked electrolyte flows to the insulating base 130 under the battery cell 111 due to the gravity. A plurality of sampling points 21 are arranged in the insulation base 130, when leaked electrolyte flows to the insulation base 130, the electrolyte is electrically communicated with the two sampling points 21, so that the resistance value between the two sampling points 21 is changed, and the resistance value of the open circuit is changed into a resistance value corresponding to the resistance value of the electrolyte. Whether the battery cell 111 in the battery 100 leaks electrolyte or not can be accurately determined by the battery management system 140 on whether the resistance value between any two sampling points 21 changes, so that the realization cost is reduced while the leakage of the battery is effectively detected.

In an embodiment, referring to fig. 4, fig. 4 is a schematic structural diagram of a battery management system in the leakage detection device according to the embodiment of the present application. As shown in fig. 4, the battery management system 140 may include a voltage sampling unit 141 and a power supply unit 142.

The voltage sampling unit is used for collecting voltage values corresponding to the communication condition between any two sampling points.

The power supply unit 142 is connected to the plurality of sampling points 21 for providing a predetermined voltage.

A voltage (i.e., the preset voltage) is applied between any two sampling points 21 through the power supply unit 142, and a voltage value corresponding to a communication condition between any two sampling points 21 is collected through the voltage sampling unit 141, so that a resistance value between the two sampling points 21 is calculated. When the electrolyte leaks from the cell 111 of the battery 100, the leaked electrolyte flows to the insulating base 130 under the cell 111 due to gravity, so that two sampling points 21, which are not originally connected, in the insulating base 130 are connected, and a resistor corresponding to a resistance value when the electrolyte is connected to the two sampling points 21 is generated, and the voltage sampling unit 141 can detect a voltage change condition generated due to a change in a connection condition between the two sampling points 21, so that a resistance value between the two sampling points 21 can be determined. Based on this, the battery management system 140 can determine the resistance change between the two sampling points 21 through the voltage change condition acquired by the voltage sampling unit 141.

In a specific application, the voltage sampling unit 141 may include a sampling resistor, where the sampling resistor may be connected between the battery management system 140 and the sampling point 21 in a pull-up resistor manner, that is, the sampling resistor and the resistor between the two sampling points are connected between a preset voltage and a ground point in a series manner, so as to form a sampling circuit; the voltage change condition can be determined by collecting the voltages at the two ends of the sampling resistor, so that the resistance change between the sampling points 21 is determined. Specifically, when the two sampling points 21 are open, the sampling circuit is in an open state, and the current is 0, so that the voltage on the sampling resistor is the preset voltage; when the two sampling points 21 are connected through the electrolyte, the sampling resistor and the resistor between the two sampling points 21 form a series voltage division, and then the voltage on the sampling resistor is smaller than the preset voltage, so that whether the electrolyte exists between the two sampling points 21 can be judged, and whether the electrolyte leaks or not can be judged.

Of course, alternatively, the sampling resistor may be disposed between the sampling point and the ground point to constitute a pull-down resistor, and by detecting a voltage change on the sampling resistor, the communication condition between the sampling points can also be determined, thereby judging whether or not there is a leak, or even whether it is a coolant leak or an electrolyte leak.

It should be noted that, the above-mentioned battery management system 140 may determine the resistance change condition between the two sampling points 21 by other methods, for example, may reflect the resistance change condition between the two sampling points 21 by the current change condition, etc.

Since there may be a leakage of the cooling liquid in the battery 100, in order to reduce misidentification of the leakage of the battery, the battery management system 140 may determine whether the leakage of the electrolyte is due to the equivalent resistance value between the sampling points 21 after detecting the change of the resistance between the sampling points 21.

In a specific application, the above determination of whether the electrolyte leakage is based on the equivalent resistance value between the sampling points 21 may be: and calculating to obtain an equivalent resistance value according to the voltage value obtained by detection on the sampling resistor and the current value obtained by resistance value of the sampling resistor, and determining that liquid leakage occurs if the equivalent resistance value is within a preset resistance range.

In a specific application, the preset resistance range may be set according to parameters such as the resistance of the electrolyte and the equivalent resistance of the wire.

In an embodiment of the present application, the battery management system 140 is further configured to identify whether the electrolyte leakage occurs according to the voltage change condition. Since the corresponding resistances of different electrolytes or other solutions are different, the generated divided voltage values are also different, so that the resistance between two sampling points can be further determined according to the voltage value acquired by the voltage acquisition unit 141 to determine whether the leakage of the electrolyte or the leakage of other solutions occurs.

Specifically, if the resistance value between the two sampling points corresponds to the resistance value corresponding to the electrolyte, it is determined that the electrolyte leakage occurs, and if the resistance value between the two sampling points corresponds to the resistance value corresponding to the other solution, it is determined that the other solution leakage occurs.

For example, referring to fig. 5, fig. 5 shows a schematic structure of a liquid leakage detection device according to other embodiments of the present application. As shown in fig. 5, the sampling points 21 may include only the first sampling points 211 and the second sampling points 212.

The first sampling point 211 and the second sampling point 212 are electrically connected to the battery management system 140.

In this application embodiment, just can realize the detection of battery weeping through setting up two sampling points, realization with low costs and easy realization.

In a specific application, the first sampling point 211 and the second sampling point 212 may be electrically connected to the battery management system 140 through the wires 22.

In the embodiment of the application, the battery management system and the sampling point are connected through the lead, so that reliable signal transmission can be provided, and the implementation cost is optimized.

In an embodiment of the present application, the insulating base 130 of the battery 100 is further provided with a groove 131, and the sampling point 21 is directly fixed in the groove 131.

For example, referring to fig. 6, fig. 6 shows a schematic structure of a leak detection apparatus according to other embodiments of the present application. As shown in fig. 6, the insulating base 130 of the battery 100 is further provided with a groove 131, and the first sampling point 211 and the second sampling point 212 are disposed in the groove 131, and since the position of the groove 131 is at the lowest position of the upper surface of the insulating base 130, in case of leakage of electrolyte in the battery, the leaked electrolyte flows into the groove 131, so that the first sampling point 211 and the second sampling point 212 disposed in the groove 131 can contact the leaked electrolyte to generate a short circuit, and the battery management system 140 can detect a resistance change condition between the first sampling point 211 and the second sampling point 212, thereby effectively improving the detection sensitivity to the leakage condition. And can just can form the gathering in the recess 131 of bottom when electrolyte weeping is less, and then detect the weeping problem through the weeping detection device of this application.

In one embodiment of the present application, the plurality of sampling points 21 may be disposed on the insulating base 130 at equal intervals.

For example, referring to fig. 7, fig. 7 shows a schematic structure of a liquid leakage detection device according to other embodiments of the present application. As shown in fig. 7, 5 sampling points 21 (P1, P2, P3, P4, and P5, respectively) are provided on the insulating base 130, and the P1, P2, P3, P4, and P5 are provided at equal intervals (assuming that the interval is Y1), so that when any one of the cells 111 in the battery 100 leaks, and the leaked electrolyte flows onto the insulating base 130 of the battery 100 due to the gravity, the sampling points 21 can be connected by the leaked electrolyte and short-circuited, thereby detecting a change in resistance and improving the sensitivity of the leakage detection.

In an embodiment of the present application, the positions of the plurality of sampling points 21 may be set according to the positions of the battery cells 111.

In this embodiment of the present application, the setting of the positions of the plurality of sampling points 21 according to the position of the electrical core 111 may be that two sampling points 21 are set below the position where the electrical core is prone to leak, or may be that two sampling points 21 are set below the corresponding gap positions of two adjacent electrical cores 111 while two sampling points 21 are set below the position where each electrical core 111 is prone to leak.

The position of the cell where leakage is easy to occur can be near an electrode of the cell or can be a joint of the cell.

It will be appreciated that in other implementations, the positions of the plurality of sampling points 21 may be set according to actual requirements.

In this embodiment, the positions of the sampling points 21 are set according to the positions of the battery cells 111, so that when the battery cells 111 in the battery 100 leak, the sampling points 21 at corresponding positions below the battery cells 111 where the leakage occurs are communicated by leaked electrolyte to be short-circuited, thereby detecting the change of resistance and improving the sensitivity of the leakage detection

The embodiment of the application further provides a battery, where the battery includes the leakage detection device 20, the insulating base 130, the battery module 110, and the battery cell 111 according to any one of the embodiments.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the embodiments, and are intended to be included within the scope of the claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (10)

1. A liquid leakage detection device, characterized by comprising:

the plurality of sampling points are arranged on the insulating base below the battery cell at intervals;

and the battery management system is electrically connected with the plurality of sampling points and is used for detecting the resistance change among the plurality of sampling points.

2. The liquid leakage detection device of claim 1, wherein the insulating base is provided with a groove, and the plurality of sampling points are directly fixed in the groove.

3. The leakage detection device of claim 2, wherein the plurality of sampling points are adhesively secured in the recess.

4. The leakage detection device of claim 1, wherein the plurality of sampling points are equally spaced on the insulating base.

5. The leakage detection device of claim 1, wherein the locations of the plurality of sampling points are set according to the locations of the cells.

6. The leakage detection device of claim 5, wherein the plurality of sampling points are electrically connected to the battery management system by wires.

7. The leakage detection apparatus according to any one of claims 1 to 6, wherein the battery management system includes:

the voltage sampling unit is used for collecting voltage values corresponding to the communication condition between any two sampling points;

and the power supply unit is connected with the plurality of sampling points and is used for providing preset voltage.

8. The leakage detection device of claim 7, wherein the battery management system further comprises:

the resistance value calculation unit is used for calculating an equivalent resistance value between the sampling points according to the acquired voltage values;

and the detection unit is used for judging whether electrolyte leakage occurs according to the equivalent resistance value.

9. The liquid leakage detection device of claim 7, wherein the voltage sampling unit comprises a sampling resistor.

10. A battery comprising an electric core and the leakage detection device according to any one of claims 1 to 9.