Battery pack coolant leakage detection method, circuit and vehicle having the same

Abstract

The present disclosure relates to a battery pack coolant leakage detection method, circuit and vehicle having the same, and relates to the field of battery technology. The method includes: charging the first parasitic capacitor and the second parasitic capacitor of the battery pack respectively; wherein the first parasitic capacitor is composed of the main positive electrode in the battery pack and the battery pack shell, and the second parasitic capacitor is composed of the main negative electrode in the battery pack and the battery pack shell; detecting the charging time of the first parasitic capacitor and the charging time of the second parasitic capacitor; and detecting whether the coolant of the battery pack has leaked according to the charging time of the first parasitic capacitor and the charging time of the second parasitic capacitor. The present disclosure determines whether the coolant of the battery pack has leaked by charging the first parasitic capacitor and the second parasitic capacitor of the battery pack respectively, detecting the charging time of the first parasitic capacitor and the second parasitic capacitor, and can accurately detect the coolant leakage of the battery pack when a small amount of coolant has leaked and no insulation failure has been caused.

Description

Technical Field

[0001] The present disclosure relates to the field of battery technology, and in particular to a battery pack coolant leakage detection method and circuit, and a vehicle having the same. Background Art

[0002] In recent years, new energy electric vehicles have become increasingly popular in my country, and the performance of power batteries has become one of the important indicators for evaluating the quality of an electric vehicle. In order to make the power battery have better performance, the battery will be kept at a suitable operating temperature through liquid cooling / heating. However, during the use of the power battery, liquid may leak from the water cooling plate or water pipe, which will reduce the cooling / heating function of the power battery on the one hand, and may cause the insulation of the battery pack to fail on the other hand, bringing high-voltage safety risks. Summary of the invention

[0003] In order to overcome the problems existing in the related art, the present disclosure provides a battery pack coolant leakage detection method, circuit and vehicle having the same.

[0004] According to a first aspect of an embodiment of the present disclosure, a method for detecting a battery pack coolant leakage is provided, comprising:

[0005] Charging a first parasitic capacitor and a second parasitic capacitor of the battery pack respectively; wherein the first parasitic capacitor is formed by a main positive electrode in the battery pack and a battery pack shell, and the second parasitic capacitor is formed by a main negative electrode in the battery pack and the battery pack shell;

[0006] detecting a charging time of the first parasitic capacitor and a charging time of the second parasitic capacitor;

[0007] Whether the coolant of the battery pack leaks is detected according to the charging time of the first parasitic capacitor and the charging time of the second parasitic capacitor.

[0008] In some embodiments of the present disclosure, the detection of the charging time of the first parasitic capacitor and the charging time of the second parasitic capacitor includes: determining a first time to start charging the first parasitic capacitor; determining a second time when the voltage of the first parasitic capacitor reaches a first target voltage; calculating the difference between the second time and the first time, and determining the obtained time difference as the charging time of the first parasitic capacitor; determining a third time to start charging the second parasitic capacitor; determining a fourth time when the voltage of the second parasitic capacitor reaches a second target voltage; calculating the difference between the fourth time and the third time, and determining the obtained time difference as the charging time of the second parasitic capacitor; wherein the first target voltage and the second target voltage are the same voltage or different voltages.

[0009] In some embodiments of the present disclosure, the method further includes: determining a current voltage of the battery pack, and determining the current voltage of the battery pack as the first target voltage and / or the second target voltage; or, determining a pre-set fixed voltage, and determining the fixed voltage as the first target voltage and / or the second target voltage.

[0010] In some embodiments of the present disclosure, detecting whether the coolant of the battery pack has leaked based on the charging time of the first parasitic capacitor and the charging time of the second parasitic capacitor includes: comparing the charging time of the first parasitic capacitor with a preset first time threshold; comparing the charging time of the second parasitic capacitor with a preset second time threshold; determining that the coolant of the battery pack has leaked in response to the charging time of the first parasitic capacitor being greater than the first time threshold, and / or the charging time of the second parasitic capacitor being greater than the second time threshold.

[0011] In some embodiments of the present disclosure, the method further includes: in response to the charging time of the first parasitic capacitor being less than or equal to the first time threshold, and the charging time of the second parasitic capacitor being less than or equal to the second time threshold, determining that the coolant of the battery pack has not leaked.

[0012] In some embodiments of the present disclosure, the method further includes: in response to a coolant leakage in the battery pack, generating a prompt message of the coolant leakage, and providing the prompt message to a user.

[0013] In some embodiments of the present disclosure, the generating of the prompt information of the coolant leakage includes: determining a target charging time greater than a corresponding time threshold based on the charging time of the first parasitic capacitor and the charging time of the second parasitic capacitor; determining a degree of capacitance change of the parasitic capacitor corresponding to the target charging time based on the target charging time greater than the corresponding time threshold; determining leakage level information of the coolant based on the capacitance change degree; generating the prompt information of the coolant leakage, wherein the prompt information carries the leakage level information.

[0014] According to a second aspect of an embodiment of the present disclosure, a battery pack coolant leakage detection circuit is provided, comprising: a first parasitic capacitor, a second parasitic capacitor, a first charging module, a second charging module, a first resistor, a second resistor, a first switch, a second switch and a detection module, wherein:

[0015] The first parasitic capacitor is formed by the main positive electrode in the battery pack and the battery pack shell;

[0016] One end of the first charging module is connected to the main positive electrode in the battery pack, and the other end of the first charging module is connected to the battery pack shell and one end of the first resistor respectively, wherein the first charging module is used to charge the first parasitic capacitor;

[0017] The other end of the first resistor is connected to the first end of the first switch;

[0018] The second end of the first switch is connected to the battery pack housing;

[0019] The second parasitic capacitor is formed by the main negative electrode in the battery pack and the battery pack shell;

[0020] One end of the second charging module is connected to the main negative electrode in the battery pack, and the other end of the second charging module is respectively connected to the battery pack shell and one end of the second resistor, wherein the second charging module is used to charge the second parasitic capacitor;

[0021] The other end of the second resistor is connected to the first end of the second switch;

[0022] The second end of the second switch is connected to the battery pack housing;

[0023] The detection module is connected to the third end of the first switch and the third end of the second switch respectively. The detection module is used to detect the charging time of the first parasitic capacitor and the charging time of the second parasitic capacitor when the first switch and the second switch are controlled to be closed, and detect whether the coolant of the battery pack leaks according to the charging time of the first parasitic capacitor and the charging time of the second parasitic capacitor.

[0024] In some embodiments of the present disclosure, the detection module is specifically used to: determine a first time to start charging the first parasitic capacitor; determine a second time when the voltage of the first parasitic capacitor reaches a first target voltage; calculate the difference between the second time and the first time, and determine the obtained time difference as the charging time of the first parasitic capacitor. Determine a third time to start charging the second parasitic capacitor; determine a fourth time when the voltage of the second parasitic capacitor reaches a second target voltage; calculate the difference between the fourth time and the third time, and determine the obtained time difference as the charging time of the second parasitic capacitor; wherein the first target voltage and the second target voltage are the same voltage or different voltages.

[0025] In some embodiments of the present disclosure, the circuit also includes a determination module, wherein the determination module is specifically used to: determine a current voltage of the battery pack, and determine the current voltage of the battery pack as the first target voltage and / or the second target voltage; or, determine a pre-set fixed voltage, and determine the fixed voltage as the first target voltage and / or the second target voltage.

[0026] In some embodiments of the present disclosure, the detection module is specifically used to: compare the charging time of the first parasitic capacitor with a preset first time threshold; compare the charging time of the second parasitic capacitor with a preset second time threshold; in response to the charging time of the first parasitic capacitor being greater than the first time threshold, and / or the charging time of the second parasitic capacitor being greater than the second time threshold, determine that the coolant of the battery pack is leaking.

[0027] In some embodiments of the present disclosure, the detection module is further used to: determine that the coolant of the battery pack has not leaked in response to the charging time of the first parasitic capacitor being less than or equal to the first time threshold, and the charging time of the second parasitic capacitor being less than or equal to the second time threshold.

[0028] In some embodiments of the present disclosure, the circuit further includes a prompt module for generating a prompt message of coolant leakage when coolant leakage occurs in the battery pack, and providing the prompt message to a user.

[0029] In some embodiments of the present disclosure, the prompt module is specifically used to: determine a target charging time that is greater than a corresponding time threshold based on the charging time of the first parasitic capacitor and the charging time of the second parasitic capacitor; determine a degree of capacitance change of the parasitic capacitor corresponding to the target charging time based on the target charging time that is greater than the corresponding time threshold; determine leakage level information of the coolant based on the degree of capacitance change; and generate prompt information of coolant leakage, wherein the prompt information carries the leakage level information.

[0030] According to a third aspect of an embodiment of the present disclosure, a vehicle is provided, comprising: a processor; and a memory for storing processor executable instructions; wherein the instructions are executed by the processor so that the processor can execute the battery pack coolant leakage detection method described in the first aspect above.

[0031] According to a fourth aspect of an embodiment of the present disclosure, a vehicle is provided, comprising the battery pack coolant leakage detection circuit described in the second aspect above.

[0032] According to a fifth aspect of an embodiment of the present disclosure, a computer-readable storage medium is provided. When instructions in the storage medium are executed by a processor of an electronic device, the electronic device is enabled to execute the battery pack coolant leakage detection method described in the first aspect above.

[0033] The technical solution provided by the embodiment of the present disclosure may include the following beneficial effects: charging the first parasitic capacitor and the second parasitic capacitor of the battery pack respectively, and determining whether the coolant of the battery pack has leaked by detecting the charging time of the first parasitic capacitor and the second parasitic capacitor. The present disclosure can accurately detect the coolant leakage of the battery pack when a small amount of coolant leaks and does not cause insulation failure.

[0034] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0036] Figure 1 The figure is a flow chart of a method for detecting battery pack coolant leakage according to an exemplary embodiment.

[0037] Figure 2 is a flow chart showing another method for detecting battery pack coolant leakage according to an exemplary embodiment.

[0038] Figure 3 is a flow chart of yet another method for detecting battery pack coolant leakage according to an exemplary embodiment.

[0039] Figure 4 is a schematic diagram of a battery pack coolant leakage detection circuit according to an exemplary embodiment.

[0040] Figure 5 is a block diagram of a vehicle according to an exemplary embodiment. DETAILED DESCRIPTION

[0041] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples of devices and methods consistent with some aspects of the present invention as detailed in the appended claims.

[0042] In the related art, most of the insulation resistances of the positive terminal of the battery pack to the ground and the negative terminal of the battery pack to the ground are used to determine whether the insulation of the battery pack has failed, and then to determine whether the coolant has leaked. However, when the coolant leakage is small and does not cause the insulation failure of the battery pack, this method cannot effectively detect whether the coolant has leaked.

[0043] Therefore, the present disclosure provides a battery pack coolant leakage detection method, circuit and vehicle having the same, which can accurately detect whether a battery pack coolant leaks when a small amount of coolant leaks and does not cause insulation failure. Figure 1 FIG. 1 is a flow chart showing a method for detecting a battery pack coolant leakage according to an exemplary embodiment. Figure 1 As shown, the battery pack coolant leakage detection method includes the following steps.

[0044] In step 101 , a first parasitic capacitor and a second parasitic capacitor of a battery pack are charged respectively.

[0045] The first parasitic capacitor is formed by the main positive electrode in the battery pack and the battery pack shell, and the second parasitic capacitor is formed by the main negative electrode in the battery pack and the battery pack shell.

[0046] It should be noted that in the battery pack, the main positive electrode of the battery pack and the battery pack shell, and the main negative electrode of the battery pack and the battery pack shell are respectively equivalent to the two plates of the capacitor, and the main positive electrode of the battery pack and the battery pack shell, and the non-metallic material and air between the main negative electrode of the battery pack and the battery pack shell are equivalent to the dielectric in the capacitor. Therefore, the main positive electrode of the battery pack and the battery pack shell and the dielectric therebetween can be regarded as the first parasitic capacitor of the battery pack, and the main negative electrode of the battery pack and the battery pack shell and the dielectric therebetween can be regarded as the second parasitic capacitor of the battery pack. When the coolant leaks from the water cooling plate / water pipe of the battery pack, the leaked coolant replaces the air as the dielectric of the first parasitic capacitor and / or the second parasitic capacitor, thereby changing the capacitance value of the first parasitic capacitor and / or the second parasitic capacitor of the battery pack. The calculation formula of the capacitance can refer to formula (1).

[0047]

[0048] Where C is the capacitance, ε0 is the vacuum permittivity (8.855F / m), ε r is the relative permittivity of the dielectric, S is the electrode area, and d is the distance between the electrodes. From formula (1), we can see that the electrode area S, the distance between the electrodes d, and the permittivity of the dielectric ε r It is an important factor affecting the capacitance.

[0049] However, in the battery pack, taking the first parasitic capacitor as an example, the electrode area and the distance between the electrodes of the first parasitic capacitor remain basically unchanged, and the dielectric mainly includes non-metallic materials and air between the main positive electrode of the battery pack and the battery pack shell in the first parasitic capacitor. When the coolant leaks out from the water cooling plate / water pipe, the coolant fills the space originally occupied by the air between the main positive electrode of the battery pack and the battery pack shell, and serves as the dielectric between the plates of the first parasitic capacitor. Since the relative permittivity of the coolant is dozens of times that of the air, the capacitance of the first parasitic capacitor becomes larger. The size of the capacitance affects the charging time of the first parasitic capacitor. The larger the capacitance, the longer the charging time. The same is true for the second parasitic capacitor. Based on this principle, the present disclosure charges the first parasitic capacitor and the second parasitic capacitor in the battery pack respectively, and determines whether the coolant of the battery pack has leaked by detecting the charging time of the first parasitic capacitor and the charging time of the second parasitic capacitor.

[0050] In step 102, a charging time of a first parasitic capacitor and a charging time of a second parasitic capacitor are detected.

[0051] As a possible implementation, the time when the first parasitic capacitor starts to charge and the time when the capacitor voltage reaches a preset voltage value can be calculated to obtain the charging time of the first parasitic capacitor. The time when the second parasitic capacitor starts to charge and the time when the capacitor voltage reaches a preset voltage value can be calculated to obtain the charging time of the second parasitic capacitor.

[0052] In step 103, whether the coolant of the battery pack leaks is detected according to the charging time of the first parasitic capacitor and the charging time of the second parasitic capacitor.

[0053] In some embodiments of the present disclosure, the charging time of the first parasitic capacitor can be compared with a preset first time threshold, and the charging time of the second parasitic capacitor can be compared with a preset second time threshold. The preset first time threshold and the preset second time threshold can be the charging time of the first parasitic capacitor and the second parasitic capacitor of the same battery pack obtained through multiple experiments when the coolant of the battery pack does not leak. If the charging time of the first parasitic capacitor is greater than the first time threshold, or the charging time of the second parasitic capacitor is greater than the second time threshold, or the charging time of the first parasitic capacitor is greater than the first time threshold, and the charging time of the second parasitic capacitor is greater than the second time threshold, it can be determined that the coolant of the battery pack has leaked; if the charging time of the first parasitic capacitor is less than or equal to the first time threshold, and the charging time of the second parasitic capacitor is less than or equal to the second time threshold, it can be determined that the coolant of the battery pack has not leaked.

[0054] According to the battery pack coolant leakage detection method of the embodiment of the present disclosure, the first parasitic capacitor and the second parasitic capacitor of the battery pack are charged respectively, and by detecting the charging time of the first parasitic capacitor and the second parasitic capacitor, it is determined whether the coolant of the battery pack has leaked. The present disclosure can accurately detect the coolant leakage of the battery pack when a small amount of coolant leaks and does not cause insulation failure.

[0055] Figure 2 is a flow chart showing another method for detecting battery pack coolant leakage according to an exemplary embodiment. Figure 2 As shown, the battery pack coolant leakage detection method includes the following steps.

[0056] In step 201 , a first parasitic capacitor and a second parasitic capacitor of a battery pack are charged respectively.

[0057] In step 202, a first time for starting to charge a first parasitic capacitor is determined.

[0058] In step 203 , a second time when the voltage of the first parasitic capacitor reaches the first target voltage is determined.

[0059] As a possible implementation manner, the current voltage of the battery pack may be determined, the current voltage of the battery pack may be determined as the first target voltage, and the second time when the voltage of the first parasitic capacitor reaches the first target voltage may be further determined.

[0060] As another possible implementation, a pre-designed fixed voltage may be determined and the fixed voltage may be determined as the first target voltage. The fixed voltage may be a fixed voltage applicable to a large number of battery packs and set based on the performance of a large number of battery packs; or, it may be a fixed voltage applicable to the current battery pack and set based on the performance of the battery pack itself. When the voltage of the first parasitic capacitor reaches the preset fixed voltage, a second time when the voltage of the first parasitic capacitor reaches the preset fixed voltage is determined.

[0061] In step 204, a difference is calculated between the second time and the first time, and the obtained time difference is determined as the charging time of the first parasitic capacitor.

[0062] In step 205 , a third time for starting to charge the second parasitic capacitor is determined.

[0063] In step 206 , a fourth time when the voltage of the second parasitic capacitor reaches the second target voltage is determined.

[0064] As a possible implementation, the current voltage of the battery pack may be determined, the current voltage of the battery pack may be determined as the second target voltage, and the fourth time when the voltage of the second parasitic capacitor reaches the second target voltage may be further determined. It should be noted that the first target voltage and the second target voltage may be the same voltage or different voltages.

[0065] As another possible implementation, a pre-designed fixed voltage may be determined and the fixed voltage may be determined as the second target voltage. The fixed voltage may be a fixed voltage applicable to a large number of battery packs and set based on the performance of a large number of battery packs; or, it may be a fixed voltage applicable to the current battery pack and set based on the performance of the battery pack itself. When the voltage of the second parasitic capacitor reaches the preset fixed voltage, a fourth time when the voltage of the second parasitic capacitor reaches the preset fixed voltage is determined.

[0066] In step 207, a difference is calculated between the fourth time and the third time, and the obtained time difference is determined as the charging time of the second parasitic capacitor.

[0067] In step 208 , whether the coolant of the battery pack leaks is detected based on the charging time of the first parasitic capacitor and the charging time of the second parasitic capacitor.

[0068] According to the battery pack coolant leakage detection method of the embodiment of the present disclosure, the first parasitic capacitor and the second parasitic capacitor of the battery pack are charged respectively, and the charging time of the first parasitic capacitor is determined by the first time when the first parasitic capacitor starts to be charged and the second time when the voltage of the first parasitic capacitor reaches the first target voltage, and the charging time of the second parasitic capacitor is determined by the third time when the second parasitic capacitor starts to be charged and the fourth time when the voltage of the second parasitic capacitor reaches the second target voltage. According to the charging time of the first parasitic capacitor and the charging time of the second parasitic capacitor, it is determined whether the coolant of the battery pack has leaked. The present disclosure can more accurately detect the coolant leakage of the battery pack when a small amount of coolant leaks and does not cause insulation failure.

[0069] In order to ensure user safety when the coolant of the battery pack leaks, the present disclosure also proposes a battery pack coolant leakage detection method, which reminds the user when the coolant leakage of the battery pack is detected. Figure 3 is a flow chart showing another method for detecting battery pack coolant leakage according to an exemplary embodiment. Figure 3 As shown, the battery pack coolant leakage detection method includes the following steps.

[0070] In step 301 , a first parasitic capacitor and a second parasitic capacitor of a battery pack are charged respectively.

[0071] The first parasitic capacitor is formed by the main positive electrode in the battery pack and the battery pack shell, and the second parasitic capacitor is formed by the main negative electrode in the battery pack and the battery pack shell.

[0072] In step 302, a charging time of a first parasitic capacitor and a charging time of a second parasitic capacitor are detected.

[0073] In step 303, whether the coolant of the battery pack leaks is detected according to the charging time of the first parasitic capacitor and the charging time of the second parasitic capacitor.

[0074] In step 304 , in response to a coolant leak in the battery pack, a coolant leak prompt message is generated and provided to a user.

[0075] As a possible implementation method, an alarm prompt can be made through the vehicle-mounted device, and / or the prompt information can be sent to the user's terminal device. The prompt information can be a voice broadcast or an alarm alarm. If the alarm prompt is made through the user's terminal device, the prompt information can be a voice broadcast, a short message prompt, a push notification message, etc.

[0076] Furthermore, in order to more accurately reflect the leakage level of the coolant, in some embodiments of the present disclosure, a target charging time greater than a corresponding time threshold may be determined based on the charging time of the first parasitic capacitor and the charging time of the second parasitic capacitor. Based on the target charging time greater than the corresponding time threshold, the degree of capacitance change of the parasitic capacitor corresponding to the target charging time is determined. Based on the degree of capacitance change, the leakage level information of the coolant is determined and a prompt message of coolant leakage is generated. The prompt message carries the leakage level information.

[0077] As an example, assuming that the charging time of the first parasitic capacitor is greater than the first time threshold, the charging time of the first parasitic capacitor can be determined as the target charging time. According to the target charging time, the capacitance change degree of the parasitic capacitor corresponding to the target charging time is determined, and the leakage level information of the coolant is further determined to be a first-level coolant leakage, and a prompt message carrying the leakage level information is generated, for example, the prompt message may be "a first-level coolant leakage is currently occurring".

[0078] According to the battery pack coolant leakage detection method of the embodiment of the present disclosure, the first parasitic capacitor and the second parasitic capacitor of the battery pack are charged respectively, and by detecting the charging time of the first parasitic capacitor and the second parasitic capacitor, it is determined whether the coolant of the battery pack has leaked. And according to the target charging time that is greater than the corresponding time threshold, a corresponding coolant leakage prompt message is generated to remind the user to pay attention to the current coolant leakage so as to take certain measures to deal with it. The present disclosure can accurately detect the coolant leakage of the battery pack when a small amount of coolant leaks and does not cause insulation failure. In the event of coolant leakage in the battery pack, a fault alarm is issued in time and the leakage level is accurately reflected to ensure user safety.

[0079] Figure 4 FIG. 1 is a schematic diagram of a battery pack coolant leakage detection circuit according to an exemplary embodiment. Figure 4 As shown, the battery pack coolant leakage detection circuit includes: a first parasitic capacitor 401, a first charging module 402, a first resistor 403, a first switch 404, a second parasitic capacitor, a second charging module, a second resistor, a second switch and a detection module, wherein the second parasitic capacitor, the second charging module, the second resistor, the second switch and the detection module are not in Figure 4 Shown in.

[0080] The first parasitic capacitor 401 is formed by the main positive electrode in the battery pack and the battery pack shell.

[0081] One end of the first charging module 402 (positive power pole) is connected to the main positive pole in the battery pack, and the other end of the first charging module 402 is respectively connected to the battery pack shell (equivalent to ground) and one end of the first resistor 403, wherein the first charging module 402 is used to charge the first parasitic capacitor 401.

[0082] The other end of the first resistor 403 is connected to the first end of the first switch 404 .

[0083] The second end of the first switch 404 is connected to the battery pack housing in the first capacitor.

[0084] The second parasitic capacitor is formed by the main negative electrode in the battery pack and the battery pack shell.

[0085] One end of the second charging module (negative power supply electrode) is connected to the main negative electrode in the battery pack, and the other end of the second charging module is respectively connected to the battery pack shell and one end of the second resistor, wherein the second charging module is used to charge the second parasitic capacitor.

[0086] The other end of the second resistor is connected to the first end of the second switch.

[0087] The second end of the second switch is connected to the battery pack housing.

[0088] The detection module is connected to the third end of the first switch 404 and the third end of the second switch respectively. The detection module is used to detect the charging time of the first parasitic capacitor 401 and the charging time of the second parasitic capacitor when the first switch 404 and the second switch are controlled to be closed, and detect whether the coolant of the battery pack leaks according to the charging time of the first parasitic capacitor 401 and the charging time of the second parasitic capacitor.

[0089] It should be noted that the connection relationship between the second parasitic capacitor, the second charging module, the second resistor, the second switch and the detection module is not shown in this embodiment. Figure 4 The connection relationship among the first parasitic capacitor, the first charging module, the first resistor, the first switch and the detection module is the same.

[0090] In some embodiments of the present disclosure, the detection module is specifically used to: determine a first time to start charging the first parasitic capacitor; determine a second time when the voltage of the first parasitic capacitor reaches a first target voltage; calculate the difference between the second time and the first time, and determine the obtained time difference as the charging time of the first parasitic capacitor; determine a third time to start charging the second parasitic capacitor; determine a fourth time when the voltage of the second parasitic capacitor reaches a second target voltage; calculate the difference between the fourth time and the third time, and determine the obtained time difference as the charging time of the second parasitic capacitor; wherein the first target voltage and the second target voltage are the same voltage or different voltages.

[0091] In some embodiments of the present disclosure, the detection module is specifically used to: compare the charging time of the first parasitic capacitor with a preset first time threshold; compare the charging time of the second parasitic capacitor with a preset second time threshold; in response to the charging time of the first parasitic capacitor being greater than the first time threshold, and / or the charging time of the second parasitic capacitor being greater than the second time threshold, determine that the coolant of the battery pack is leaking.

[0092] In some embodiments of the present disclosure, the detection module is also used to: determine that the coolant of the battery pack has not leaked in response to the charging time of the first parasitic capacitor being less than or equal to the first time threshold, and the charging time of the second parasitic capacitor being less than or equal to the second time threshold.

[0093] In some embodiments of the present disclosure, the battery pack coolant leakage detection circuit may further include a determination module, wherein the determination module is specifically used to: determine a current voltage of the battery pack, and determine the current voltage of the battery pack as a first target voltage and / or a second target voltage; or, determine a pre-set fixed voltage, and determine the fixed voltage as the first target voltage and / or the second target voltage.

[0094] In some embodiments of the present disclosure, the battery pack coolant leakage detection circuit may further include a prompt module, wherein the prompt module is used to generate a coolant leakage prompt message when the coolant of the battery pack leaks, and provide the prompt message to the user.

[0095] In some embodiments of the present disclosure, the prompt module is specifically used to: determine a target charging time greater than a corresponding time threshold based on the charging time of the first parasitic capacitor and the charging time of the second parasitic capacitor; determine a degree of change in capacitance of the parasitic capacitor corresponding to the target charging time based on the target charging time greater than the corresponding time threshold; determine leakage level information of the coolant based on the degree of change in capacitance; and generate prompt information of coolant leakage, wherein the prompt information carries the leakage level information.

[0096] Regarding the circuit in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0097] According to the battery pack coolant leakage detection circuit of the embodiment of the present disclosure, the first parasitic capacitor and the second parasitic capacitor of the battery pack are charged respectively, and by detecting the charging time of the first parasitic capacitor and the second parasitic capacitor, it is determined whether the coolant of the battery pack has leaked. The present disclosure can accurately detect the coolant leakage of the battery pack when a small amount of coolant leaks and does not cause insulation failure.

[0098] The present disclosure also provides a vehicle, comprising a battery pack coolant leakage detection circuit as described in any of the above embodiments.

[0099] The present disclosure also proposes another vehicle, Figure 5 is a block diagram of a vehicle 500 according to an exemplary embodiment. Figure 5 , the vehicle 500 may include one or more of the following components: a processing component 502 , a memory 504 , a power component 506 , a multimedia component 508 , an audio component 510 , an input / output (I / O) interface 512 , a sensor component 514 , and a communication component 516 .

[0100] The processing component 502 generally controls the overall operation of the vehicle 500, such as operations associated with display, phone calls, data communications, camera operations, and recording operations. The processing component 502 may include one or more processors 520 to execute instructions to complete all or part of the steps of the above-described method. In addition, the processing component 502 may include one or more modules to facilitate interaction between the processing component 502 and other components. For example, the processing component 502 may include a multimedia module to facilitate interaction between the multimedia component 508 and the processing component 502.

[0101] The memory 504 is configured to store various types of data to support operations on the device 500. Examples of such data include instructions for any application or method operating on the vehicle 500, contact data, phone book data, messages, pictures, videos, etc. The memory 504 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk.

[0102] Power components 506 provide power to various components of vehicle 500. Power components 506 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power to vehicle 500.

[0103] The multimedia component 508 includes a screen that provides an output interface between the vehicle 500 and the user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive input signals from the user. The touch panel includes one or more touch sensors to sense touch, slide, and gestures on the touch panel. The touch sensor may not only sense the boundaries of the touch or slide action, but also detect the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 508 includes a front camera and / or a rear camera. When the device 500 is in an operating mode, such as a shooting mode or a video mode, the front camera and / or the rear camera may receive external multimedia data. Each front camera and rear camera may be a fixed optical lens system or have focal length and optical zoom capabilities.

[0104] The audio component 510 is configured to output and / or input audio signals. For example, the audio component 510 includes a microphone (MIC), and when the vehicle 500 is in an operating mode, such as a call mode, a recording mode, and a voice recognition mode, the microphone is configured to receive an external audio signal. The received audio signal can be further stored in the memory 504 or sent via the communication component 516. In some embodiments, the audio component 510 also includes a speaker for outputting audio signals.

[0105] I / O interface 512 provides an interface between processing component 502 and peripheral interface modules, such as keyboards, click wheels, buttons, etc. These buttons may include but are not limited to: a home button, a volume button, a start button, and a lock button.

[0106] The sensor assembly 514 includes one or more sensors for providing various aspects of status assessment for the vehicle 500. For example, the sensor assembly 514 can detect the open / closed state of the device 500, the relative positioning of the components, such as the display and keypad of the vehicle 500, and the sensor assembly 514 can also detect the position change of the vehicle 500 or a component of the vehicle 500, the presence or absence of user contact with the vehicle 500, the orientation or acceleration / deceleration of the vehicle 500, and the temperature change of the vehicle 500. The sensor assembly 514 may include a proximity sensor configured to detect the presence of nearby objects without any physical contact. The sensor assembly 514 may also include an optical sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 514 may also include an accelerometer, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

[0107] The communication component 516 is configured to facilitate wired or wireless communication between the vehicle 500 and other devices. The vehicle 500 can access a wireless network based on a communication standard, such as WiFi, 2G or 3G, or a combination thereof. In an exemplary embodiment, the communication component 516 receives a broadcast signal or broadcast-related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 516 also includes a near field communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology and other technologies.

[0108] In an exemplary embodiment, the vehicle 500 may be implemented by one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components to perform the above-described methods.

[0109] In an exemplary embodiment, a non-transitory computer-readable storage medium including instructions is also provided, such as a memory 504 including instructions, which can be executed by a processor 520 of the vehicle 500 to perform the above method. For example, the non-transitory computer-readable storage medium can be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, etc.

[0110] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present disclosure is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The description and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0111] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A battery pack coolant leakage detection method, characterized in that: include: Charging a first parasitic capacitor and a second parasitic capacitor of the battery pack respectively; wherein the first parasitic capacitor is formed by a main positive electrode in the battery pack and a battery pack shell, and the second parasitic capacitor is formed by a main negative electrode in the battery pack and the battery pack shell; detecting a charging time of the first parasitic capacitor and a charging time of the second parasitic capacitor; Based on the comparison result of the charging time of the first parasitic capacitor and the preset first time threshold, and / or the comparison result of the charging time of the second parasitic capacitor and the preset second time threshold, detect whether the coolant of the battery pack is leaking.

2. The method according to claim 1, characterized in that The detecting the charging time of the first parasitic capacitor and the charging time of the second parasitic capacitor includes: Determining a first time to start charging the first parasitic capacitor; determining a second time when the voltage of the first parasitic capacitor reaches a first target voltage; Calculating the difference between the second time and the first time, and determining the obtained time difference as the charging time of the first parasitic capacitor; determining a third time to start charging the second parasitic capacitor; determining a fourth time when the voltage of the second parasitic capacitor reaches a second target voltage; Calculating the difference between the fourth time and the third time, and determining the obtained time difference as the charging time of the second parasitic capacitor; The first target voltage and the second target voltage are the same voltage or different voltages.

3. The method according to claim 2, characterized in that Also includes: Determining a current voltage of the battery pack, and determining the current voltage of the battery pack as the first target voltage and / or the second target voltage; or, A preset fixed voltage is determined, and the fixed voltage is determined as the first target voltage and / or the second target voltage.

4. The method according to claim 1, characterized in that The detecting whether the coolant of the battery pack leaks according to a comparison result of the charging time of the first parasitic capacitor with a preset first time threshold, and / or a comparison result of the charging time of the second parasitic capacitor with a preset second time threshold, includes: In response to the charging time of the first parasitic capacitor being greater than the first time threshold, and / or the charging time of the second parasitic capacitor being greater than the second time threshold, it is determined that the coolant of the battery pack is leaking.

5. The method according to claim 4, characterized in that Also includes: In response to the charging time of the first parasitic capacitor being less than or equal to the first time threshold, and the charging time of the second parasitic capacitor being less than or equal to the second time threshold, it is determined that the coolant of the battery pack has not leaked.

6. The method according to any one of claims 1 to 5, characterized in that Also includes: In response to a coolant leak in the battery pack, prompt information of the coolant leak is generated and provided to a user.

7. The method according to claim 6, characterized in that The generating the coolant leakage prompt information includes: Determining a target charging time greater than a corresponding time threshold according to a charging time of the first parasitic capacitor and a charging time of the second parasitic capacitor; According to the target charging time greater than the corresponding time threshold, determining a capacitance change degree of the parasitic capacitor corresponding to the target charging time; Determining leakage level information of the coolant according to the degree of change of the capacitance; Generate prompt information of the coolant leakage, wherein the prompt information carries the leakage level information.

8. A battery pack coolant leakage detection circuit, characterized in that: include: A first parasitic capacitor, a second parasitic capacitor, a first charging module, a second charging module, a first resistor, a second resistor, a first switch, a second switch and a detection module, wherein: The first parasitic capacitor is formed by the main positive electrode in the battery pack and the battery pack shell; One end of the first charging module is connected to the main positive electrode in the battery pack, and the other end of the first charging module is connected to the battery pack shell and one end of the first resistor respectively, wherein the first charging module is used to charge the first parasitic capacitor; The other end of the first resistor is connected to the first end of the first switch; The second end of the first switch is connected to the battery pack housing; The second parasitic capacitor is formed by the main negative electrode in the battery pack and the battery pack shell; One end of the second charging module is connected to the main negative electrode in the battery pack, and the other end of the second charging module is respectively connected to the battery pack shell and one end of the second resistor, wherein the second charging module is used to charge the second parasitic capacitor; The other end of the second resistor is connected to the first end of the second switch; The second end of the second switch is connected to the battery pack housing; The detection module is connected to the third end of the first switch and the third end of the second switch respectively. The detection module is used to detect the charging time of the first parasitic capacitor and the charging time of the second parasitic capacitor when controlling the first switch and the second switch to be closed, and detect whether the coolant of the battery pack is leaking based on the comparison result of the charging time of the first parasitic capacitor with a preset first time threshold, and / or the comparison result of the charging time of the second parasitic capacitor with a preset second time threshold.

9. The circuit according to claim 8, characterized in that The detection module is specifically used for: Determining a first time to start charging the first parasitic capacitor; determining a second time when the voltage of the first parasitic capacitor reaches a first target voltage; Calculating the difference between the second time and the first time, and determining the obtained time difference as the charging time of the first parasitic capacitor; determining a third time to start charging the second parasitic capacitor; determining a fourth time when the voltage of the second parasitic capacitor reaches a second target voltage; Calculating the difference between the fourth time and the third time, and determining the obtained time difference as the charging time of the second parasitic capacitor; The first target voltage and the second target voltage are the same voltage or different voltages.

10. The circuit according to claim 9, characterized in that The system further includes a determination module, wherein the determination module is specifically configured to: Determining a current voltage of the battery pack, and determining the current voltage of the battery pack as the first target voltage and / or the second target voltage; or, A preset fixed voltage is determined, and the fixed voltage is determined as the first target voltage and / or the second target voltage.

11. The circuit according to claim 8, characterized in that The detection module is specifically used for: In response to the charging time of the first parasitic capacitor being greater than the first time threshold, and / or the charging time of the second parasitic capacitor being greater than the second time threshold, it is determined that the coolant of the battery pack is leaking.

12. The circuit according to claim 11, characterized in that The detection module is also used for: In response to the charging time of the first parasitic capacitor being less than or equal to the first time threshold, and the charging time of the second parasitic capacitor being less than or equal to the second time threshold, it is determined that the coolant of the battery pack has not leaked.

13. The circuit according to any one of claims 8 to 12, characterized in that Also includes: The prompt module is used to generate a prompt message of coolant leakage when the coolant of the battery pack leaks, and provide the prompt message to the user.

14. The circuit according to claim 13, characterized in that The prompt module is specifically used for: Determining a target charging time greater than a corresponding time threshold according to a charging time of the first parasitic capacitor and a charging time of the second parasitic capacitor; According to the target charging time greater than the corresponding time threshold, determining a capacitance change degree of the parasitic capacitor corresponding to the target charging time; Determining leakage level information of the coolant according to the degree of change of the capacitance; Generate prompt information of the coolant leakage, wherein the prompt information carries the leakage level information.

15. A vehicle, characterized in that: include: processor; A memory for storing processor executable instructions; wherein the instructions are executed by the processor to enable the processor to execute the battery pack coolant leakage detection method according to any one of claims 1 to 7.

16. A vehicle, characterized in that: The invention comprises a battery pack coolant leakage detection circuit as claimed in any one of claims 8 to 14.

17. A computer-readable storage medium, characterized in that: When the instructions in the storage medium are executed by a processor of an electronic device, the electronic device is enabled to execute the battery pack coolant leakage detection method as described in any one of claims 1 to 7.

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