CN116465572A - Battery detection equipment and method and device for detecting battery - Google Patents

Battery detection equipment and method and device for detecting battery Download PDF

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Publication number
CN116465572A
CN116465572A CN202310730965.5A CN202310730965A CN116465572A CN 116465572 A CN116465572 A CN 116465572A CN 202310730965 A CN202310730965 A CN 202310730965A CN 116465572 A CN116465572 A CN 116465572A
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China
Prior art keywords
gas
battery pack
battery
detection
valve group
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Granted
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CN202310730965.5A
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Chinese (zh)
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CN116465572B (en
Inventor
何甫
瞿飞
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Contemporary Amperex Technology Co Ltd
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Contemporary Amperex Technology Co Ltd
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Priority to CN202310730965.5A priority Critical patent/CN116465572B/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4285—Testing apparatus
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

The embodiment of the application discloses battery detection equipment and a method and a device for detecting batteries. The battery detection equipment comprises an inflation valve group, an exhaust valve group and a detection assembly; the first end of the air charging valve group is used for being connected with external air charging equipment, and the second end of the air charging valve group is used for being connected with a battery pack; one end of the exhaust valve group is connected with the second end of the inflation valve group; and the detection assembly is used for responding to the closing of the inflation valve group and the opening of the exhaust valve group under the condition that the battery pack is completely inflated, and acquiring the gas parameters of the gas exhausted by the battery pack so as to determine the liquid leakage detection result of the battery pack according to the gas parameters. The battery detection device provided by the embodiment of the application can improve the detection efficiency of the battery.

Description

Battery detection equipment and method and device for detecting battery
Technical Field
The application relates to the field of battery detection, in particular to battery detection equipment and a method and a device for detecting batteries.
Background
With the rapid development of new energy industry, the use of batteries is more and more popular. In order to improve the safety of the battery, it is generally necessary to detect the leakage of the battery. In the related art, for the leakage detection of a battery, the battery is usually inverted to determine whether the battery leaks by observing the appearance of the battery module. However, this method requires disassembly of the battery, which may destroy the gas tightness of the battery itself, and requires long observation, so that the detection takes a long time, resulting in low detection efficiency of the battery.
Disclosure of Invention
In view of the above problems, the present application provides a battery detection device, and a method and apparatus for detecting a battery thereof, which can improve the detection efficiency of the battery.
In a first aspect, embodiments of the present application provide a battery detection device, including an inflation valve set, an exhaust valve set, and a detection assembly; the first end of the air charging valve group is used for being connected with external air charging equipment, and the second end of the air charging valve group is used for being connected with a battery pack; one end of the exhaust valve group is connected with the second end of the inflation valve group; and the detection assembly is used for responding to the closing of the inflation valve group and the opening of the exhaust valve group under the condition that the battery pack is completely inflated, and acquiring the gas parameters of the gas exhausted by the battery pack so as to determine the liquid leakage detection result of the battery pack according to the gas parameters.
In the technical scheme of this application embodiment, provide a battery check out test set, set up and aerify valves and exhaust valves and realize the charging and discharging to the group battery to acquire the gas parameter of the gaseous gas of group battery inflation back fast through detection component and carry out the weeping detection of group battery, thereby need not to disassemble the group battery, and can obtain the weeping testing result of group battery fast through the gaseous gas parameter of exhaust, and then improve the detection efficiency of battery.
In some embodiments, the detection assembly is specifically for: determining that the detection assembly completes gas sensing correction, and under the condition that the battery pack completes gas filling, responding to closing of the gas filling valve group and opening of the gas discharging valve group, acquiring gas parameters of gas discharged by the battery pack, so as to determine a liquid leakage detection result of the battery pack according to the gas parameters; the gas sensing correction is performed through gas parameters of gas in the first target object accessed by the detection component. After the gas sensing correction is carried out on the detection assembly according to the gas parameters of the gas in the first target object accessed by the detection assembly, the detection assembly is used for rapidly acquiring the gas parameters of the gas exhausted after the battery pack is inflated to carry out the leakage detection of the battery pack, so that the accuracy of the acquired gas parameters is improved, and the detection accuracy of the battery is further improved.
In some embodiments, the detection assembly is further configured to: acquiring the current air pressure of the second end of the air charging valve group under the condition that the battery pack is in an air charging state; and under the condition that the current air pressure reaches the preset air pressure, determining that the battery pack completes the inflation. Whether the current air pressure reaches the preset air pressure or not is judged by detecting the current air pressure at the second end of the air inflation valve group, and under the condition that the current air pressure reaches the preset air pressure, the battery pack is determined to be inflated, so that whether the battery pack is inflated or not can be judged by detecting the current air pressure at the second end of the air inflation valve group, the judgment accuracy of an inflation result is improved, and the detection efficiency of a battery is further improved.
In some embodiments, the detection assembly is specifically for: determining that the detection assembly completes pressure sensing correction, and acquiring the current air pressure of the second end of the air charging valve group under the condition that the battery pack is in an air charging state; and the pressure sensing correction is performed according to the pressure output by the second target object connected with the detection assembly. Through the pressure according to the second target output of detection component access, carry out pressure sensing correction to detection component after, the rethread detection component detects the current atmospheric pressure of the second end of group battery in the state of aerifing to make the testing result to current atmospheric pressure more accurate, improved the accuracy of inflation result judgement, and then further improved the detection efficiency of battery.
In some embodiments, the detection assembly is specifically for: according to the detection results of the gas parameters of each target gas in the gas exhausted by the battery pack, obtaining battery detection results corresponding to each target gas; determining a liquid leakage detection result of the battery pack according to the battery detection result corresponding to each target gas; the target gas is generated by the battery pack under the condition of liquid leakage. And detecting the gas parameters of each target gas by the gas exhausted by the battery pack to obtain battery detection results corresponding to each target gas, so as to determine the leakage detection result of the battery pack by using the battery detection results corresponding to each target gas, and detecting whether the gas exhausted by the battery pack exists the gas possibly generated by the battery pack under the condition of leakage when the leakage of the battery pack is detected, so that the leakage detection result of the battery is more accurate.
In some embodiments, the detection assembly is specifically for: and comparing the gas parameter of the target gas with at least one preset parameter corresponding to the target gas to obtain a battery detection result corresponding to the target gas.
In some embodiments, the preset parameters are determined according to a preset crack diameter, a preset duration, a pressure of the battery pack after the battery pack is inflated, a space of the battery pack and a gas type of the target gas; the detection component is specifically used for: and comparing the gas parameter of the target gas with at least one preset parameter corresponding to the target gas to obtain the leakage duration of the target gas and the crack diameter of the battery pack for leakage of the target gas. The preset parameters are determined by preset crack diameters, preset duration, pressure of the battery pack after the battery pack is inflated, space of the battery pack and gas type of the target gas, so that the leakage duration of the target gas and the crack diameter of the battery pack when the battery pack leaks the target gas can be obtained by comparing at least one preset parameter corresponding to the target gas with the gas parameter of the target gas, and therefore the obtained battery detection result can reflect whether leakage of the target gas exists or not, the leakage duration of the target gas and the crack diameter of the battery pack, and further the battery detection equipment can detect the battery pack more comprehensively.
In some embodiments, the detection assembly is further configured to: under the condition that the battery pack is completely inflated, responding to closing of the inflation valve group and the exhaust valve group, acquiring pressure difference between the second end of the inflation valve group and the first end of the battery pack, and obtaining an air tightness detection result of the battery pack according to the pressure difference. Under the condition that the battery pack is inflated, the inflation valve group and the exhaust valve group are closed, so that the pressure difference between the second end of the inflation valve group and the first end of the battery pack can be accurately obtained to detect the air tightness of the battery pack, the air tightness of the battery pack can be accurately judged, the battery detection equipment can be used for carrying out liquid leakage detection and air tightness detection, and the comprehensiveness of battery detection is improved.
In some embodiments, the battery detection apparatus further comprises a test valve block through which the second end of the inflation valve block is connected to the battery pack; the detection component is specifically used for: under the condition that the battery pack is completely inflated, responding to closing of the inflation valve group, the test valve group and the exhaust valve group, and acquiring pressure difference between a first end and a second end of the test valve group so as to obtain an air tightness detection result of the battery pack according to the pressure difference. Through set up a test valves between inflation valves and group battery to under the condition that the group battery was accomplished to aerify, respond to inflation valves, test valves with the closing of exhaust valves, after obtaining the pressure difference between the first end of test valves and the second end, judge the gas tightness of group battery through this pressure difference, thereby can judge more accurately whether the gas leakage appears in the battery, further improve the accuracy that the gas tightness of battery detected.
In some embodiments, the detection assembly is specifically for: comparing the pressure difference with a preset value to obtain an air tightness detection result of the battery pack; the preset value is determined according to the critical diameter of the leakage hole of the battery pack, the test pressure corresponding to the air tightness level required to be achieved by the battery pack and the space of the battery pack. The preset value is determined through the critical diameter of the leakage hole of the battery pack, the test pressure corresponding to the air tightness level required to be achieved by the battery pack and the space of the battery pack, so that the obtained preset value is more accurate, the confidence of the air tightness detection result obtained through the comparison of the preset value and the pressure difference is higher, and the accuracy of the air tightness detection of the battery is further improved.
In a second aspect, the present application provides a method for detecting a battery by using a battery detection device, which is applied to the battery detection device in any one of the foregoing embodiments, and the method includes: under the condition that the battery pack completes charging, responding to closing of the charging valve group and opening of the discharging valve group, and acquiring gas parameters of gas discharged by the battery pack; and determining a leakage detection result of the battery pack according to the gas parameter.
In the technical scheme of this embodiment of application, realize the charging and discharging to the group battery through setting up charging valves and exhaust valves to acquire the gas parameter of the gaseous exhaust after the group battery is inflated fast through detecting the subassembly and carry out the weeping detection of group battery, thereby need not to disassemble the group battery, and can obtain the weeping testing result of group battery fast through the gaseous gas parameter of exhaust, and then improve the detection efficiency of battery.
In some embodiments, when the battery pack completes charging, in response to closing of the charging valve set and opening of the discharging valve set, acquiring a gas parameter of a gas discharged by the battery pack includes: determining that the detection assembly completes gas sensing correction, and under the condition that the battery pack completes gas filling, responding to closing of the gas filling valve group and opening of the gas discharging valve group, acquiring gas parameters of gas discharged by the battery pack, so as to determine a liquid leakage detection result of the battery pack according to the gas parameters; the gas sensing correction is performed through gas parameters of gas in the first target object accessed by the detection component.
In some embodiments, the method further comprises: acquiring the current air pressure of the second end of the air charging valve group under the condition that the battery pack is in an air charging state; and under the condition that the current air pressure reaches the preset air pressure, determining that the battery pack completes the inflation.
In some embodiments, when the battery pack is in an inflated state, obtaining the current air pressure of the second end of the inflation valve set includes: determining that the detection assembly completes pressure sensing correction, and acquiring the current air pressure of the second end of the air charging valve group under the condition that the battery pack is in an air charging state; and the pressure sensing correction is performed according to the pressure output by the second target object connected with the detection assembly.
In some embodiments, determining a leakage detection result of the battery pack according to the gas parameter includes: according to the detection results of the gas parameters of each target gas in the gas exhausted by the battery pack, obtaining battery detection results corresponding to each target gas; determining a liquid leakage detection result of the battery pack according to the battery detection result corresponding to each target gas; the target gas is generated by the battery pack under the condition of liquid leakage.
In some embodiments, according to the detection result of the gas parameter of each target gas in the gas exhausted from the battery pack, obtaining a battery detection result corresponding to each target gas includes: and comparing the gas parameter of the target gas with at least one preset parameter corresponding to the target gas to obtain a battery detection result corresponding to the target gas.
In some embodiments, the preset parameters are determined according to a preset crack diameter, a preset duration, a pressure of the battery pack after the battery pack is inflated, a space of the battery pack and a gas type of the target gas; comparing the gas parameter of the target gas with at least one preset parameter corresponding to the target gas to obtain a battery detection result corresponding to the target gas, wherein the battery detection result comprises: and comparing the gas parameter of the target gas with at least one preset parameter corresponding to the target gas to obtain the leakage duration of the target gas and the crack diameter of the battery pack for leakage of the target gas.
In some embodiments, the method further comprises: under the condition that the battery pack is completely inflated, responding to closing of the inflation valve group and the exhaust valve group, acquiring pressure difference between the second end of the inflation valve group and the first end of the battery pack, and obtaining an air tightness detection result of the battery pack according to the pressure difference.
In some embodiments, the battery detection apparatus further comprises a test valve block through which the second end of the inflation valve block is connected to the battery pack; under the condition that the battery pack is completely inflated, responding to closing of the inflation valve group and the exhaust valve group, acquiring pressure difference between the second end of the inflation valve group and the first end of the battery pack, so as to obtain an air tightness detection result of the battery pack according to the pressure difference, wherein the air tightness detection result comprises the following steps: under the condition that the battery pack is completely inflated, responding to closing of the inflation valve group, the test valve group and the exhaust valve group, and acquiring pressure difference between a first end and a second end of the test valve group so as to obtain an air tightness detection result of the battery pack according to the pressure difference.
In some embodiments, obtaining the air tightness detection result of the battery pack according to the pressure difference comprises: comparing the pressure difference with a preset value to obtain an air tightness detection result of the battery pack; the preset value is determined according to the critical diameter of the leakage hole of the battery pack, the test pressure corresponding to the air tightness level required to be achieved by the battery pack and the space of the battery pack.
In a third aspect, the present application provides an apparatus for detecting a battery by using a battery detection device, which is applied to the battery detection device described in any one of the foregoing embodiments, and the apparatus includes: the parameter acquisition module is used for responding to the closing of the gas charging valve group and the opening of the gas discharging valve group under the condition that the battery pack completes the charging, so as to acquire the gas parameters of the gas discharged by the battery pack; and the battery detection module is used for determining the leakage detection result of the battery pack according to the gas parameter.
In the technical scheme of this embodiment of application, realize the charging and discharging to the group battery through setting up charging valves and exhaust valves to acquire the gas parameter of the gaseous exhaust after the group battery is inflated fast through detecting the subassembly and carry out the weeping detection of group battery, thereby need not to disassemble the group battery, and can obtain the weeping testing result of group battery fast through the gaseous gas parameter of exhaust, and then improve the detection efficiency of battery.
In a fourth aspect, the present application provides an electronic device comprising a memory storing a computer program and a processor executing the method in an implementation of the second aspect when the computer program is executed.
In a fifth aspect, the present application provides a computer readable storage medium having stored thereon a computer program which when executed by a processor performs the method in an embodiment of the second aspect.
In a sixth aspect, the present application provides a computer program product which, when run on a computer, causes the computer to perform the method in an embodiment of the second aspect.
In a seventh aspect, the present application provides a power device comprising the battery detection device provided in the first aspect, or the electronic device provided in the fourth aspect.
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 view of an application environment of a battery detection device according to some embodiments of the present application;
FIG. 2 is a first block diagram of a battery detection device according to some embodiments of the present application;
FIG. 3 is a second block diagram of a battery detection device according to some embodiments of the present application;
fig. 4 is a third block diagram of a battery detection apparatus according to some embodiments of the present application;
fig. 5 is a fourth block diagram of a battery detection apparatus according to some embodiments of the present application;
FIG. 6 is a flow chart of a method of battery detection by a battery detection device according to some embodiments of the present application;
fig. 7 is a schematic structural diagram of a device for detecting a battery by using a battery detection apparatus according to some embodiments of the present application;
fig. 8 is a schematic structural diagram of an electronic device according to some embodiments of the present application.
The reference numerals of the parts in the specific embodiments are as follows:
10-battery detection device; 20-battery pack; 30-an external inflation device; 100-inflating valve group; 101-an exhaust valve group; 102-a detection component; 103-testing the valve group; 200-detecting a terminal; 201-a gas sensing device; 202-a pressure sensing device; 203-a differential pressure sensing device; 300-a parameter acquisition module; 301-a battery detection module; 400-an electronic device; 401-a processor; 402-memory; 403-communication bus.
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.
With the development of new energy industry, more and more power equipment, such as electric vehicles, are powered by batteries. In order to improve the safety of the battery, it is generally necessary to detect the leakage of the battery.
At present, the battery is inverted to judge whether liquid flows out or not by observing the appearance of the battery module, so as to judge whether the battery leaks or not. However, in order to accurately observe whether or not the appearance of the battery module has liquid flowing out when the leakage detection is performed in this manner, the battery needs to be disassembled. This would destroy the air tightness of the battery itself, and require a long time for observation, so that the detection takes a long time, resulting in low detection efficiency of the battery.
Aiming at the technical problems, the battery leakage is accompanied with the gas inside the battery cell, such as CO and H 2 、CH 4 Leakage of at least one of the gases whileIn the case of battery leakage, characteristic gases DMC, DEC, etc. of the electrolyte are also generated as the electrolyte volatilizes, so in the embodiment of the present application, leakage detection is performed on the battery by detecting the gas discharged from the battery pack. In order to perform the leakage detection more efficiently, as shown in fig. 1, the embodiment of the present application provides a battery detection apparatus 10, where the battery detection apparatus 10 is connected to a battery pack 20, and the battery detection apparatus 10 is configured to obtain gas exhausted from the battery pack after the battery pack 20 is inflated, so as to perform the leakage detection of the battery pack. And through the charging and discharging of the battery pack, the discharged gas after charging of the battery pack can be rapidly obtained to carry out the leakage detection of the battery pack, the battery pack is not required to be disassembled, and the leakage detection result of the battery pack can be rapidly obtained through the gas parameters of the discharged gas, so that the detection efficiency of the battery is improved.
A battery testing apparatus provided according to some embodiments of the present application, as shown in fig. 2, the battery testing apparatus 10 includes an inflation valve assembly 100, an exhaust valve assembly 101, and a testing assembly 102; a first end of the valve block 100 is for accessing the external inflation device 30, and a second end of the valve block 100 is for accessing the battery pack 20; one end of the exhaust valve group 101 is connected with the second end of the inflation valve group 100; the detection assembly 102 is configured to obtain a gas parameter of the gas discharged from the battery pack 20 in response to closing of the gas charging valve set 100 and opening of the gas discharging valve set 101 when the battery pack 20 completes charging, so as to determine a leakage detection result of the battery pack 20 according to the gas parameter.
In some embodiments, the inflation valve assembly 100 may include at least one inflation valve and the exhaust valve assembly 101 may include at least one exhaust valve. The charging valve and the discharging valve can comprise electric valves controlled by signals, such as hydraulic electromagnetic valves or pneumatic electromagnetic valves.
The detection assembly 102 may include a detection terminal 200 and a gas sensor 201, and the detection terminal 200 may be any terminal device such as a mobile terminal, a desktop terminal, a vehicle-mounted terminal, or a server. Wherein the vehicle-mounted terminal may be at least one of a battery management system (Battery Management System, abbreviated as BMS) and a vehicle controller (Vehicle Control Unit, abbreviated as VCU). The server can be an independent server or a server cluster formed by a plurality of servers, and can also be a cloud server for providing basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communication, middleware services, domain name services, security services, CDNs, big data and artificial intelligent sampling point devices and the like.
The gas sensor 201 may be disposed on an exhaust path formed by the battery pack 20 and the exhaust valve block 101, wherein the exhaust path refers to a path through which the gas exhausted from the battery pack 20 flows. The gas sensing device 201 may include at least one gas sensor. The battery pack 20 may include at least one battery cell.
The gas sensor device 201 may include a sensor for detecting CO, H 2 、CH 4 A first gas sensor for detecting a gas such as DMC, DEC, etc. The measurement range of the gas sensor 201 can be determined according to the concentration of the gas detected by the gas sensor 201 when the gas is completely diffused into the battery pack 20 in the battery cells of the battery pack 20. Taking a gas sensor for detecting CO in the gas sensor 201 as an example, the corresponding gas volume in the battery cell of the battery pack 20 can be calculated according to the maximum cell pressure, the atmospheric pressure and the cell volume of the battery pack 20 after the battery pack 20 is charged and discharged. For example, the maximum cell pressure after the battery pack 20 is charged and discharged is typically 0.25-0.3MPa, and the corresponding gas volume V1 in the cell can be obtained according to P (cell pressure) V2 (cell volume) =p (atmospheric pressure) V1 (gas volume). Then, the CO concentration in the battery pack 20 when the gas generated in the battery cells is completely diffused into the battery pack 20 is calculated according to the preset content of the gas generating component CO and the free space of the battery pack 20. The free space may refer to a space between the outer case of the battery pack 20 and the battery cells of the battery pack 20. Assuming that the CO content is 5% and the free space of the battery pack 20 is 60L, when the gas generated in the cell is fully diffused into the battery pack 20, the CO concentration in the battery pack 20=v1×5%/60. After the CO concentration is obtained, a gas sensor having a measurement range not smaller than the CO concentration may be selected to perform liquid leakage detection on the battery pack 20.
As one possible embodiment, the gas sensor device 201 may be disposed at one of both ends of the exhaust valve block 101 on the exhaust path formed by the battery pack 20 and the exhaust valve block 101, and if the gas sensor device 201 includes a first gas sensor and a second gas sensor, the first gas sensor may be disposed at one of both ends of the exhaust valve block 101, while the second gas sensor may be disposed at one of both ends of the exhaust valve block 101.
As another possible embodiment, the gas sensor 201 may be disposed on the exhaust path formed by the battery pack 20 and the exhaust valve block 101, at the end where the battery pack 20 is connected to the exhaust valve block 101.
As yet another possible embodiment, the gas sensing device 201 may be disposed at one of both ends of the exhaust valve block 101 and one end of the battery pack 20 connected to the exhaust valve block 101. If it is assumed that the gas sensing device 201 includes a first gas sensor and a second gas sensor, the first gas sensor may be disposed at one of both ends of the exhaust valve group 101, while the second gas sensor is disposed at the end of the battery pack 20 connected to the exhaust valve group 101.
In some embodiments, in the event that battery leak detection is desired, the inflation valve assembly 100 may be opened to inflate the battery pack 20 via an activated external inflation device 30, such as an activated inflator. In order to improve the inflation efficiency, in the case of inflating the battery pack 20 through the external inflation device 30, the exhaust valve group 101 may be closed, so that the condition of air leakage in the inflation process caused by the opening of the exhaust valve group 101 is avoided, and the inflation efficiency of the battery pack 20 is improved.
As a possible implementation manner, the detection terminal 200 may be connected to the air valve set 100 and the air exhaust valve set 101, and in a case where battery leakage detection is required, the air valve set 100 may be opened by the detection terminal 200, and the air exhaust valve set 101 may be closed at the same time, so that the opened external air charging device 30 charges the battery pack 20.
In the case where the battery pack completes the charging, the charging valve group 100 is closed, and the discharging valve group 101 is opened, so that the gas in the battery pack 20 is discharged through the discharging path formed by the battery pack 20 and the discharging valve group 101.
As a possible embodiment, the inflation valve assembly 100 and the exhaust valve assembly 101 may be provided with a timer that starts counting when the inflation valve assembly 100 is open and the exhaust valve assembly 101 is closed. When the inflation valve assembly 100 is opened and the exhaust valve assembly 101 is closed for a preset time period set by the timer, it may indicate that the battery pack is completely inflated, and at this time, the inflation valve assembly 100 is closed and the exhaust valve assembly 101 is opened. The preset time length can be set according to actual conditions.
As another possible embodiment, the detection terminal 200 of the detection assembly 102 may be connected to the inflation valve assembly 100 and the exhaust valve assembly 101, and the detection terminal 200 may be provided with a timer. In the case where the air valve group 100 is opened and the air valve group 101 is closed, if the detection terminal 200 controls the air valve group 100 to be opened and the air valve group 101 to be closed, the detection terminal 200 starts timing. When the detection terminal 200 detects that the timing duration reaches the preset duration, the battery pack can be indicated to be inflated, and at the moment, the detection terminal 200 can control the inflation valve set 100 to be closed, and the exhaust valve set 101 to be opened.
With the inflation valve assembly 100 closed and the exhaust valve assembly 101 open, the detection terminal 200 of the detection assembly 102 may obtain a gas parameter of the gas discharged from the battery pack 20 through the gas sensing device 201 disposed on the exhaust path of the detection assembly 102 in response to the closing of the inflation valve assembly 100 and the opening of the exhaust valve assembly 101.
As a possible embodiment, a flow sensor for detecting the gas flow may also be provided in the exhaust path, which flow sensor is connected to the detection terminal 200. Since the gas flow rate of the exhaust path is significantly increased when the battery pack 20 is exhausting, the detection terminal 200 can detect whether the variation of the gas flow rate of the exhaust path exceeds the threshold value by the flow sensor to determine whether the current opening and closing states of the air valve group 100 and the exhaust valve group 101 are the closing state of the air valve group 100 and the opening state of the exhaust valve group 101. If the detection terminal 200 determines, through the flow sensor, that the variation of the gas flow of the exhaust path exceeds the threshold, the detection terminal 200 may determine that the gas-filled valve group 100 is closed, and at the same time, the gas-filled valve group 101 is opened, and at this time, may receive the gas parameter of the gas uploaded by the gas sensor 201, where the gas parameter is the gas parameter of the gas exhausted by the battery.
As another possible embodiment, the detection terminal 200 may be connected to the air valve block 100 and the exhaust valve block 101, and at this time, the detection terminal 200 may directly detect the open/closed states of the air valve block 100 and the exhaust valve block 101, such as status signals transmitted through the air valve block 100 and the exhaust valve block 101, to determine the open/closed states of the air valve block 100 and the exhaust valve block 101. If the detection terminal 200 detects that the gas valve set 100 is closed and the gas valve set 101 is opened through the gas valve set 100 and the gas valve set 101, the gas parameter of the gas uploaded by the gas sensor 201 can be received, and the gas parameter is the gas parameter of the gas discharged by the battery.
As yet another possible embodiment, the detection terminal 200 may be connected to the air valve block 100 and the air valve block 101 for controlling the opening or closing of the air valve block 100 and the air valve block 101. In the case where the detection terminal 200 controls the inflation valve assembly 100 to be closed and controls the exhaust valve assembly 101 to be opened, the detection terminal 200 may receive the gas parameter of the gas uploaded by the gas sensor 201, where the gas parameter is the gas parameter of the gas exhausted from the battery pack 20.
Wherein the gas parameters may include all gas types included in the gas. After obtaining the gas parameter of the gas discharged from the battery pack 20, the detection module 102 can obtain the leakage detection result of the battery pack according to the gas type in the gas parameter. Illustratively, if the detection assembly 102 detects the presence of CO, H in the vented gases 2 、CH 4 At least one type of gas such as DMC, DEC, etc., can judge that the battery pack has weeping; otherwise, it may be determined that no leakage exists in the battery pack.
The battery pack is inflated and exhausted through the inflation valve group and the exhaust valve group, and the gas parameters of the exhaust gas after inflation of the battery pack are rapidly acquired through the detection assembly to carry out liquid leakage detection of the battery pack, so that the battery pack is not required to be disassembled, the liquid leakage detection result of the battery pack can be rapidly obtained through the gas parameters of the exhaust gas, and the detection efficiency of the battery is further improved.
To improve the accuracy of battery drain detection, in some embodiments, the detection assembly 102 is specifically configured to:
determining that the detection assembly 102 completes gas sensing correction, and in response to closing of the gas charging valve group 100 and opening of the gas discharging valve group 101 when the battery pack 20 completes gas charging, acquiring gas parameters of gas discharged by the battery pack 20 to determine a liquid leakage detection result of the battery pack 20 according to the gas parameters; the gas sensing calibration is performed according to a gas parameter of the gas in the first target object accessed by the detection component 102.
The gas sensor device 201 in the detection assembly 102 may be calibrated prior to battery leak detection. For example, a standard gas bag having a determined gas parameter, such as a known gas concentration, may be selected as the first target, and then the first target is deflated after the first target is connected to the detection module 102, so that the standard gas having the known gas parameter in the first target passes through the gas sensor device 201 of the detection module 102. After a certain period of time, the gas parameters obtained by the gas sensor 201 measuring the standard gas can be adjusted to the known gas parameters of the standard gas, so as to complete the gas sensing correction of the detection assembly 102.
Illustratively, assuming that the first target is a standard gas bag comprising CO, the actual concentration of CO in the standard gas bag is known, the gas sensing device 201 in the detection module 102 comprises a gas sensor for detecting the concentration of CO. Then, in the case that the gas sensing correction needs to be performed on the detection module 102, the standard gas bag may be connected to the second end of the inflation valve set 100, then the inflation valve set 100 is closed, and after the exhaust valve set 101 is opened, the gas in the standard gas bag is deflated through the standard gas bag, so that the gas in the standard gas bag flows through the gas sensing device 201 in the detection module 102, and the gas sensing device 201 detects the CO concentration. After a certain period of time, the CO concentration obtained by the gas sensor 201 measuring the gas in the standard gas bag is adjusted to the actual CO concentration in the standard gas bag, thereby completing the gas sensing correction of the detection module 102.
When the detection terminal 200 in the detection assembly 102 determines that the gas sensing device 201 completes the gas sensing correction, in response to the closing of the gas charging valve group 100 and the opening of the gas discharging valve group 101, the gas parameter of the gas discharged from the battery pack 20 is acquired by the gas sensing device 201 to determine the leakage detection result of the battery pack 20 according to the gas parameter in the case where the battery pack 20 completes the charging.
After the gas sensing correction is carried out on the detection assembly according to the gas parameters of the gas in the first target object accessed by the detection assembly, the detection assembly is used for rapidly acquiring the gas parameters of the gas exhausted after the battery pack is inflated to carry out the leakage detection of the battery pack, so that the accuracy of the acquired gas parameters is improved, and the detection accuracy of the battery is further improved.
To further increase the detection efficiency of the battery, in some embodiments, the detection assembly 102 is further configured to:
acquiring a current air pressure of the second end of the air valve set 100 in a state that the battery pack 20 is in an inflated state; in the case where the current air pressure reaches the preset air pressure, it is determined that the battery pack 20 is completely inflated.
In some embodiments, as shown in fig. 3, the detection assembly 102 may also include a pressure sensing device 202, the pressure sensing device 202 including at least one pressure sensor. A first end of the pressure sensing device 202 may be coupled to a second end of the valve block 100, and the second end of the pressure sensing device 202 may be coupled to a sensing terminal 200 in the sensing assembly 102.
With the battery pack 20 in an inflated state, the detection terminal 200 may detect the current air pressure of the second end of the air valve set 100 in real time through the pressure sensing device 202. If the current air pressure at the second end of the inflation valve assembly 100 reaches the preset air pressure, the current air pressure is sufficient, and the inflation of the battery pack is determined.
Whether the current air pressure reaches the preset air pressure or not is judged by detecting the current air pressure at the second end of the air inflation valve group, and under the condition that the current air pressure reaches the preset air pressure, the battery pack is determined to be inflated, so that whether the battery pack is inflated or not can be judged by detecting the current air pressure at the second end of the air inflation valve group, the judgment accuracy of an inflation result is improved, and the detection efficiency of a battery is further improved.
To further improve the accuracy of the inflation result determination, in some embodiments, the detection assembly 102 is specifically configured to: determining that the detection assembly completes pressure sensing correction, and acquiring the current air pressure of the second end of the air charging valve group through the pressure sensing device under the condition that the battery pack is in an air charging state; and the pressure sensing correction is performed according to the pressure output by the second target object connected with the detection component.
The pressure sensing device 202 in the sensing assembly 102 may be calibrated prior to battery leak detection. For example, an inflatable device such as an inflator or a pressure pump may be selected as the second target, and then the second target is coupled to the sensing assembly 102, and the second target inflates the pressure sensing device 202 of the sensing assembly 102. After the pressure is inflated to a certain degree, the pressure detected by the pressure sensing device 202 can be adjusted to the pressure displayed by the second target object, so that the pressure sensing correction of the detection assembly 102 is completed.
For example, assuming that the second target is a pressure pump, in the case that the pressure sensing correction needs to be performed on the detection assembly 102, the pressure pump may be connected to the first end of the inflation valve assembly 100, then the second end of the inflation valve assembly 100 is connected to any inflatable object such as the battery pack 20, and after the exhaust valve assembly 101 is closed, the inflation is performed by the pressure pump. After the inflation is performed to a certain pressure, the pressure sensor is kept stand for a period of time, such as 30 minutes, and then the pressure measured by the pressure sensor 202 is adjusted to the pressure displayed by the pressure pump, so that the pressure sensing correction of the detection assembly 102 is completed.
When the detection terminal 200 in the detection assembly 102 determines that the pressure sensing device 202 completes the pressure sensing correction, the current air pressure at the second end of the air valve set 100 may be detected by the pressure sensing device 202 completing the pressure sensing correction in the case that the battery pack 20 is in the inflated state, so as to determine whether the battery pack 20 completes the inflation according to the current air pressure.
Through the pressure according to the second target output of detection component access, carry out pressure sensing correction to detection component after, the rethread detection component detects the current atmospheric pressure of the second end of group battery in the state of aerifing to make the testing result to current atmospheric pressure more accurate, improved the accuracy of inflation result judgement, and then further improved the detection efficiency of battery.
To further improve the accuracy of the battery leakage detection results, in some embodiments, the detection assembly 102 is specifically configured to: obtaining a battery detection result corresponding to each target gas according to the detection result of the gas parameter of each target gas in the gas exhausted from the battery pack 20; determining a leakage detection result of the battery pack 20 according to the battery detection result corresponding to each target gas; the target gas is a gas generated by the battery pack 20 in the case of liquid leakage.
In some embodiments, it is contemplated that when the cells of the battery pack 20 leak, the vented gases may include CO, H inside the cells 2 CH (CH) 4 And the like, and DMC and DEC generated by volatilization of an electrolyte after cell leakage. Therefore, in order to perform better leakage detection, CO and H can be detected 2 、CH 4 The DMC, DEC, etc. gases are used as target gases and the gas sensor device 201 of the detection assembly 102 is used to detect these target gases. For any target gas, say CO, when the detection terminal 200 of the detection assembly 102 obtains the gas parameter of the gas discharged from the battery pack through the gas sensor device 201, the gas parameter of the target gas CO, such as the gas concentration of the target gas CO, can be obtained from the gas parameter. If the detection terminal 200 determines that the target gas CO does not exist in the gas exhausted by the battery pack through the gas parameter of the target gas CO, it may be determined that the battery detection result of the target gas CO is that the target gas CO does not leak; otherwise, it can be determined that the battery detection result of the target gas CO is that the target gas CO leaks.
Similarly, for H 2 、CH 4 Target gases such as DMC and DEC may be detected by the gas sensor device 201 to obtain a battery detection result of each target gas.
After the battery detection results of each target gas are obtained, if the battery detection result of at least one target gas is that the target gas leaks, determining that the battery pack 20 has liquid leakage; if the battery detection result of each target gas is that the target gas is not leaked, it can be determined that the battery pack 20 has no leakage.
And detecting the gas parameters of each target gas by the gas exhausted by the battery pack to obtain battery detection results corresponding to each target gas, so as to determine the leakage detection result of the battery pack by using the battery detection results corresponding to each target gas, and detecting whether the gas exhausted by the battery pack exists the gas possibly generated by the battery pack under the condition of leakage when the leakage of the battery pack is detected, so that the leakage detection result of the battery is more accurate.
To enable battery detection of the target gas, in some embodiments, the detection assembly 102 is specifically configured to: and comparing the gas parameter of the target gas with at least one preset parameter corresponding to the target gas to obtain a battery detection result corresponding to the target gas.
For example, when the detection terminal 200 of the detection assembly 102 acquires the gas parameter of the gas discharged from the battery pack through the gas sensing device 201, assuming CO for any one of the target gases, the gas parameter of the target gas CO may be obtained from the gas parameter. And then comparing the gas parameter of the target gas CO with at least one preset parameter corresponding to the target gas CO. If the gas parameter of the target gas CO is greater than the preset parameter, if the gas concentration of the target gas CO is greater than the preset concentration, determining that the battery detection result of the target gas CO is that the leakage of the target gas CO exists; otherwise, it may be determined that the cell detection result of the target gas CO is that there is no leakage of the target gas CO. The preset parameters corresponding to the target gas can be determined according to actual conditions, for example, the volatilization amount of the target gas generated by the battery pack without leakage can be determined.
In order to more fully detect the battery pack, in some embodiments, the preset parameters may be determined according to a preset crack diameter, a preset duration, a pressure of the battery pack after the battery pack is inflated, a space of the battery pack, and a gas type of the target gas;
the detection component 102 is specifically configured to:
And comparing the gas parameter of the target gas with at least one preset parameter corresponding to the target gas to obtain the leakage duration of the target gas and the crack diameter of the battery pack 20 for leakage of the target gas.
In some embodiments, multiple leak tests of target gas of either gas type may be performed first for a test battery pack having any one of the preset crack diameters. If the leakage test of target gas CO is carried out on the test battery pack with the crack diameter of 0.5um, each test records the preset crack diameter d, the preset time length t and the internal pressure P after the test battery pack completes the inflation 1 The space L of the test battery pack and the leakage quantity Q1 of the target gas CO, and then according to the leakage quantity Q1 of the target gas CO and the space L of the test battery pack, the internal pressure P after the test battery pack completes the inflation can be obtained, wherein the preset crack diameter is d, the preset duration is t 1 And under the condition that the free space of the test battery pack is L, testing the concentration of CO in the battery pack, and taking the concentration of CO as a preset parameter. Thus, d, t and P can be obtained 1 And (3) preset parameters corresponding to a data set consisting of L and the gas type CO.
The leakage amount of the target gas can be calculated according to the following theoretical calculation formula:
P 2 representing atmospheric pressure, η may represent the internal coefficient of friction.
When the detection terminal 200 of the detection assembly 102 needs to detect the gas parameter of the target gas for the gas exhausted from the battery pack 20, the corresponding target data set can be searched for from all the data sets according to the internal pressure of the inflated battery pack 20, the free space of the battery pack and the type of the target gas. If the internal pressure of the battery pack 20 after the completion of the charging is assumed to be P, the free space of the battery pack is 60L, and the type of the target gas is CO, a data set of which the internal pressure is P, the free space is 60L, and the type of the gas is CO is also found from all the data sets as the target data set. Then, after obtaining the corresponding preset parameters according to each target data set, the detection terminal 200 of the detection component 102 may compare the obtained gas parameters of the target gas with each preset parameter, so as to find out the preset parameters smaller than or equal to the gas parameters of the target gas from each preset parameter. If each preset parameter is greater than the gas parameter of the target gas, it indicates that the battery pack 20 does not have leakage of the target gas, i.e., there is no leakage duration of the target gas and no crack diameter of the leaked target gas. If the preset parameters are smaller than or equal to the preset parameters of the gas parameters of the target gas, the gas parameter closest to the target gas is obtained from the preset parameters smaller than or equal to the preset parameters of the gas parameters of the target gas as the target parameter, then the leakage duration of the target gas can be determined according to the preset duration corresponding to the target parameter, and the crack diameter of the battery pack 20 for leaking the target gas can be determined according to the preset crack diameter corresponding to the target parameter. If the preset duration corresponding to the target parameter is 12h and the corresponding preset crack diameter is 5um, the leakage duration of the target gas can be determined to exceed 12h, and the crack diameter of the battery pack 20 for leakage of the target gas is greater than 5um.
In order to further improve the obtained leakage duration of the target gas and the accuracy of the crack diameter of the battery pack 20 for leakage of the target gas, the gas parameter closest to the target gas may be obtained as the specified parameter from among the preset parameters larger than the gas parameter of the target gas while the gas parameter closest to the target gas is obtained as the target parameter from among the preset parameters smaller than or equal to the gas parameter of the target gas. So as to determine the duration interval (t 1, t 2) of the leakage duration of the target gas according to the preset duration t1 corresponding to the target parameter and the preset duration t2 corresponding to the specified parameter; and determining a diameter section (d 1, d 2) of the battery pack 20 to which the crack diameter leaking the target gas belongs according to the preset crack diameter d1 corresponding to the target parameter and the preset crack diameter d2 corresponding to the specified parameter.
After the leakage duration of all the target gases and the crack diameter of each target gas leaked from the battery pack 20 are obtained, the battery detection result with the longest corresponding leakage duration and the largest crack diameter can be used as the leakage detection result of the battery pack 20.
The preset parameters are determined by preset crack diameters, preset duration, pressure of the battery pack after the battery pack is inflated, space of the battery pack and gas type of the target gas, so that the leakage duration of the target gas and the crack diameter of the battery pack when the battery pack leaks the target gas can be obtained by comparing at least one preset parameter corresponding to the target gas with the gas parameter of the target gas, and therefore the obtained battery detection result can reflect whether leakage of the target gas exists or not, the leakage duration of the target gas and the crack diameter of the battery pack, and further the battery detection equipment can detect the battery pack more comprehensively.
To more fully detect the battery, in some embodiments, the detection component 102 is further configured to: in the case where the battery pack 20 completes the inflation, in response to the closing of the inflation valve group 100 and the exhaust valve group 101, a pressure difference between the second end of the inflation valve group 100 and the first end of the battery pack 20 is obtained to obtain a gas tightness detection result of the battery pack 20 according to the pressure difference.
In some embodiments, as shown in fig. 4, the detection assembly 102 further comprises a differential pressure sensing device 203, wherein the differential pressure sensing device 203 may comprise at least one differential pressure sensor. The first end of the differential pressure sensing device 203 is connected to the second end of the inflation valve assembly 100, the second end of the differential pressure sensing device 203 is connected to the first end of the battery pack 20 connected to the inflation valve assembly 100, and the third end of the differential pressure sensing device 203 is connected to the detection terminal 200 of the detection assembly 102, for detecting the pressure difference between the second end of the inflation valve assembly and the first end of the battery pack, so as to send the detected pressure difference to the detection terminal 200 of the detection assembly 102.
In the case where the battery pack completes the charging, the detection terminal 200 may acquire a pressure difference between the second end of the charging valve set 100 and the first end of the battery pack 20 through the differential pressure sensing device 203 in response to the closing of the charging valve set 100 and the discharging valve set 101. If the detection terminal 200 detects that the battery pack 20 is completely inflated, the inflation valve assembly 100 and the exhaust valve assembly 101 can be controlled to be closed, and after the inflation valve assembly 100 and the exhaust valve assembly 101 are controlled to be closed, the pressure difference between the second end of the inflation valve assembly 100 and the first end of the battery pack 20 is obtained through the pressure difference sensing device 203.
Considering that if the tightness of the battery pack 20 is normal, when the gas filling valve group 100 and the gas discharging valve group 101 are closed, the pressure difference between the second end of the gas filling valve group 100 and the first end of the battery pack 20 is small or even absent, so the detection terminal 200 can determine whether the pressure difference is greater than a preset value after acquiring the pressure difference between the second end of the gas filling valve group 100 and the first end of the battery pack 20, if so, whether the pressure difference is greater than 0. If the pressure difference is less than or equal to the preset value, the air tightness of the battery pack 20 is normal; otherwise, the air tightness of the assembled battery 20 is abnormal.
After the detection terminal 200 completes the air tightness detection of the battery pack 20, the air-charging valve set 100 may be kept closed, and the air-discharging valve set 101 may be opened to allow the battery pack 20 to discharge air, so that the leakage detection is performed by the air discharged from the battery pack 20. Illustratively, after the detection terminal 200 completes the air tightness detection of the battery pack 20, the controllable inflation valve assembly 100 remains closed and the exhaust valve assembly 101 is controlled to open for leakage detection by the exhaust gas of the battery pack 20.
Under the condition that the battery pack is inflated, the inflation valve group and the exhaust valve group are closed, so that the pressure difference between the second end of the inflation valve group and the first end of the battery pack can be accurately obtained to detect the air tightness of the battery pack, the air tightness of the battery pack can be accurately judged, the battery detection equipment can be used for carrying out liquid leakage detection and air tightness detection, and the comprehensiveness of battery detection is improved.
To further improve the accuracy of the air tightness detection of the battery, in some embodiments, as shown in fig. 5, the battery detection apparatus 10 further includes a test valve block 103, and the second end of the inflation valve block 100 is connected to the battery pack 20 through the test valve block 103.
The detection component 102 is specifically configured to: in the case where the battery pack 20 completes the charging, in response to the closing of the charging valve group 100, the testing valve group 103, and the discharging valve group 101, a pressure difference between the first end and the second end of the testing valve group 103 is obtained to obtain a gas tightness detection result of the battery pack 20 according to the pressure difference.
In some embodiments, the test valve assembly 103 may include at least one gas valve, which may include an electrically operated valve controlled by a signal, such as a hydraulic solenoid valve or a pneumatic solenoid valve, or the like. The first end of the test valve block 103 is connected to the second end of the inflation valve block 100, and the second end of the test valve block 103 is configured to access the battery pack 20. The differential pressure sensing device 203 of the detection assembly 102 is connected to both ends of the test valve block 103 to detect the differential pressure across the test valve block 103.
In case that the air tightness detection of the battery is required, the air valve group 100 and the test valve group 103 may be opened and the exhaust valve group 101 may be closed, for example, the air valve group 100 and the test valve group 103 may be controlled to be opened by the detection terminal 200 in the detection assembly 102 and the exhaust valve group 101 may be controlled to be closed to inflate the battery pack 20 by opening the external air charging device 30.
After the inflation of the battery pack 20 is completed, the inflation valve assembly 100 and the test valve assembly 103 can be closed, for example, the inflation valve assembly 100 and the test valve assembly 103 are controlled to be closed by the detection terminal 200 in the detection assembly 102, and then the detection terminal 200 starts to acquire the pressure difference between two ends of the test valve assembly 103 by the pressure difference sensor. Since the internal pressure between the test valve block 103 and the battery pack 20 will be reduced due to the leakage of the battery pack 20 when the air tightness of the battery pack 20 is abnormal, if the air-filled valve block 100, the air-discharged valve block 101 and the test valve block 103 are all closed, after a period of standing, it can be determined whether the air tightness of the battery pack is abnormal by comparing the pressure difference between the first end and the second end of the test valve block 103. If the pressure difference is greater than the preset value, or if the pressure difference is continuously increased, it may indicate that the battery pack 20 is leaking, and it may be determined that the air tightness of the battery pack 20 is abnormal. If the pressure difference is less than or equal to the preset value and the pressure difference is not continuously increased, it is determined that the air tightness of the battery pack 20 is normal.
If the pressure difference continuously decreases, the pressure at the first end of the test valve set 103 is smaller than the pressure at the second end, and the first end of the test valve set 103 is connected to the second end of the inflation valve set 100, that is, the first end of the test valve set 103 is connected to the inflation valve set 100 and the exhaust valve 102, so that it may be determined that the inflation valve set 100 or the exhaust valve 102 leaks.
Through set up a test valves between inflation valves and group battery to under the condition that the group battery was accomplished to aerify, respond to inflation valves, test valves with the closing of exhaust valves, after obtaining the pressure difference between the first end of test valves and the second end, judge the gas tightness of group battery through this pressure difference, thereby can judge more accurately whether the gas leakage appears in the battery, further improve the accuracy that the gas tightness of battery detected.
To further improve the accuracy of the air tightness test results, in some embodiments, the test assembly 102 is specifically configured to: comparing the pressure difference with a preset value to obtain an air tightness detection result of the battery pack; the preset value is determined according to the critical diameter of the leak hole of the battery pack 20, the test pressure corresponding to the air tightness level required to be reached by the battery pack 20, and the space of the battery pack 20.
In some embodiments, to obtain a more accurate preset value, the critical diameter of the corresponding leak hole when the battery pack 20 is in water can be obtained according to the following formula:
wherein, the liquid crystal display device comprises a liquid crystal display device,represents the critical diameter of the leak, < >>Indicating the test pressure corresponding to the level of tightness required to be achieved for the battery pack in the IPXX test, +. >Represents atmospheric pressure, +.>Indicating water surface tension.
The critical diameter of the leakage hole means that gas leakage does not occur when the battery pack 20 has a diameter of the leakage hole less than or equal to the critical diameter.
Then, the critical leakage value corresponding to the battery pack 20 can be obtained based on the following formula：
Where L represents the free space volume of the battery pack 20.
At the time of obtaining the critical leakage value corresponding to the battery pack 20After that, the preset value corresponding to the battery pack 20 can be obtained according to the following formula:
q2=v (mL) ×Δp/T; where V represents the free space volume of the battery pack 20, Δp represents a preset value corresponding to the battery pack 20, and T represents the temperature.
After the preset value is obtained, the preset value can be compared with the pressure difference at two ends of the test valve set 103. If the pressure difference is less than or equal to the preset value, the air tightness of the battery pack 20 is normal; if the pressure difference is greater than the preset value, the air tightness of the battery pack 20 is abnormal, and the detection terminal 200 of the detection assembly 102 alarms.
The preset value is determined through the critical diameter of the leakage hole of the battery pack, the test pressure corresponding to the air tightness level required to be achieved by the battery pack and the space of the battery pack, so that the obtained preset value is more accurate, the confidence of the air tightness detection result obtained through the comparison of the preset value and the pressure difference is higher, and the accuracy of the air tightness detection of the battery is further improved.
Fig. 6 shows a flowchart of a method for detecting a battery by a battery detection device according to an embodiment of the present application. The method for detecting the battery by the battery detection device is applied to the battery detection device in any embodiment, and specifically, the method can be applied to the detection assembly in any embodiment.
In some embodiments, the method of detecting a battery of the battery detection apparatus includes:
s101, under the condition that the battery pack completes inflation, responding to closing of an inflation valve group and opening of an exhaust valve group, and acquiring gas parameters of gas exhausted by the battery pack;
s102, determining a leakage detection result of the battery pack according to the gas parameters.
The battery pack is inflated and exhausted through the inflation valve group and the exhaust valve group, and the gas parameters of the exhaust gas after inflation of the battery pack are rapidly acquired through the detection assembly to carry out liquid leakage detection of the battery pack, so that the battery pack is not required to be disassembled, the liquid leakage detection result of the battery pack can be rapidly obtained through the gas parameters of the exhaust gas, and the detection efficiency of the battery is further improved.
In some embodiments, in response to closing of the inflation valve set and opening of the exhaust valve set, acquiring a gas parameter of a gas exhausted from the battery pack in a case where the battery pack completes inflation, including: determining that the detection assembly completes gas sensing correction, and under the condition that the battery pack completes gas filling, responding to closing of the gas filling valve group and opening of the gas discharging valve group to acquire gas parameters of gas discharged by the battery pack; the gas sensing correction is performed through detecting the gas parameters of the gas in the first target object accessed by the component.
In some embodiments, the above method further comprises: under the condition that the battery pack is in an inflated state, acquiring the current air pressure of the second end of the inflation valve group; and under the condition that the current air pressure reaches the preset air pressure, determining that the battery pack completes the inflation.
In some embodiments, obtaining the current air pressure at the second end of the air valve set with the battery pack in an inflated state comprises: determining that the detection assembly completes pressure sensing correction, and acquiring the current air pressure of the second end of the air charging valve group through the pressure sensing device under the condition that the battery pack is in an air charging state; and the pressure sensing correction is performed according to the pressure output by the second target object connected with the detection component.
In some embodiments, determining a leakage detection result of the battery pack according to the gas parameter includes: according to the detection results of the gas parameters of each target gas in the gas exhausted by the battery pack, obtaining battery detection results corresponding to each target gas; determining a leakage detection result of the battery pack according to the battery detection result corresponding to each target gas; the target gas is generated by the battery pack under the condition of liquid leakage.
In some embodiments, according to the detection result of the gas parameter of each target gas in the gas exhausted from the battery pack, obtaining the battery detection result corresponding to each target gas includes: and comparing the gas parameter of the target gas with at least one preset parameter corresponding to the target gas to obtain a battery detection result corresponding to the target gas.
In some embodiments, the preset parameters are determined according to a preset crack diameter, a preset duration, a pressure of the battery pack after the battery pack is inflated, a space of the battery pack and a gas type of the target gas; comparing the gas parameter of the target gas with at least one preset parameter corresponding to the target gas to obtain a battery detection result corresponding to the target gas, wherein the battery detection result comprises: and comparing the gas parameter of the target gas with at least one preset parameter corresponding to the target gas to obtain the leakage duration of the target gas and the crack diameter of the battery pack leakage target gas.
In some embodiments, the above method further comprises: under the condition that the battery pack is completely inflated, responding to closing of the inflation valve group and the exhaust valve group, acquiring pressure difference between the second end of the inflation valve group and the first end of the battery pack, and obtaining an air tightness detection result of the battery pack according to the pressure difference.
In some embodiments, under the condition that the battery pack completes the inflation, in response to closing of the inflation valve set and the exhaust valve set, acquiring a pressure difference between a second end of the inflation valve set and a first end of the battery pack to obtain an air tightness detection result of the battery pack according to the pressure difference, including: under the condition that the battery pack is completely inflated, responding to closing of the inflation valve group, the testing valve group and the exhaust valve group, and acquiring pressure difference between the first end and the second end of the testing valve group so as to obtain an air tightness detection result of the battery pack according to the pressure difference.
In some embodiments, obtaining the air tightness detection result of the battery pack according to the pressure difference comprises: comparing the pressure difference with a preset value to obtain an air tightness detection result of the battery pack; the preset value is determined according to the critical diameter of the leakage hole of the battery pack, the test pressure corresponding to the air tightness level required to be achieved by the battery pack and the space of the battery pack.
Fig. 7 is a schematic block diagram of a device for detecting a battery by using a battery detection apparatus according to an embodiment of the present application, and it should be understood that the device corresponds to the embodiment of the method performed in fig. 6, and is capable of performing the steps involved in the foregoing method, and specific functions of the device may be referred to in the foregoing description, and detailed descriptions thereof are omitted herein as appropriate to avoid redundancy. The device includes at least one software functional module that can be stored in memory in the form of software or firmware (firmware) or cured in an Operating System (OS) of the device. In particular, the device may be applied to the battery detection apparatus in any of the above embodiments, and in particular, may be applied to a detection assembly of the battery detection apparatus. The device comprises: the parameter obtaining module 300 is configured to obtain, when the battery pack completes charging, a gas parameter of a gas discharged from the battery pack in response to closing of the charging valve group and opening of the discharging valve group; and the battery detection module 301 is configured to determine a leakage detection result of the battery pack according to the gas parameter.
In the technical scheme of this embodiment of application, realize the charging and discharging to the group battery through setting up charging valves and exhaust valves to acquire the gas parameter of the gaseous exhaust after the group battery is inflated fast through detecting the subassembly and carry out the weeping detection of group battery, thereby need not to disassemble the group battery, and can obtain the weeping testing result of group battery fast through the gaseous gas parameter of exhaust, and then improve the detection efficiency of battery.
According to some embodiments of the present application, the parameter acquisition module 300 is specifically configured to: determining that the detection assembly completes gas sensing correction, and under the condition that the battery pack completes gas filling, responding to closing of the gas filling valve group and opening of the gas discharging valve group to acquire gas parameters of gas discharged by the battery pack; the gas sensing correction is performed through detecting the gas parameters of the gas in the first target object accessed by the component.
According to some embodiments of the present application, the parameter acquisition module 300 is further configured to: under the condition that the battery pack is in an inflated state, acquiring the current air pressure of the second end of the inflation valve group; and under the condition that the current air pressure reaches the preset air pressure, determining that the battery pack completes the inflation.
According to some embodiments of the present application, the parameter acquisition module 300 is specifically configured to: determining that the detection assembly completes pressure sensing correction, and acquiring the current air pressure of the second end of the air charging valve group through the pressure sensing device under the condition that the battery pack is in an air charging state; and the pressure sensing correction is performed according to the pressure output by the second target object connected with the detection component.
According to some embodiments of the present application, the battery detection module 301 is specifically configured to: according to the detection results of the gas parameters of each target gas in the gas exhausted by the battery pack, obtaining battery detection results corresponding to each target gas; determining a leakage detection result of the battery pack according to the battery detection result corresponding to each target gas; the target gas is generated by the battery pack under the condition of liquid leakage.
According to some embodiments of the present application, the battery detection module 301 is specifically configured to: and comparing the gas parameter of the target gas with at least one preset parameter corresponding to the target gas to obtain a battery detection result corresponding to the target gas.
According to some embodiments of the application, the preset parameters are determined according to preset crack diameters, preset time lengths, pressure intensity of the battery pack after the battery pack is inflated, space of the battery pack and gas type of the target gas; the battery detection module 301 specifically serves to: and comparing the gas parameter of the target gas with at least one preset parameter corresponding to the target gas to obtain the leakage duration of the target gas and the crack diameter of the battery pack leakage target gas.
According to some embodiments of the present application, the battery detection module 301 is further configured to: under the condition that the battery pack is completely inflated, responding to closing of the inflation valve group and the exhaust valve group, acquiring pressure difference between the second end of the inflation valve group and the first end of the battery pack, and obtaining an air tightness detection result of the battery pack according to the pressure difference.
According to some embodiments of the present application, the battery detection module 301 is specifically configured to: under the condition that the battery pack is completely inflated, responding to closing of the inflation valve group, the testing valve group and the exhaust valve group, and acquiring pressure difference between the first end and the second end of the testing valve group so as to obtain an air tightness detection result of the battery pack according to the pressure difference.
According to some embodiments of the present application, the battery detection module 301 is specifically configured to: comparing the pressure difference with a preset value to obtain an air tightness detection result of the battery pack; the preset value is determined according to the critical diameter of the leakage hole of the battery pack, the test pressure corresponding to the air tightness level required to be achieved by the battery pack and the space of the battery pack.
According to some embodiments of the present application, as shown in fig. 8, an embodiment of the present application provides an electronic device 400, including: processor 401 and memory 402, the processor 401 and memory 402 being interconnected and in communication with each other by a communication bus 403 and/or other form of connection mechanism (not shown), the memory 402 storing a computer program executable by the processor 401, the processor 401 executing the computer program when the computing device is running to perform the method performed by the external machine in any alternative implementation, such as: under the condition that the battery pack completes charging, responding to closing of the charging valve group and opening of the discharging valve group, and acquiring gas parameters of gas discharged by the battery pack; and determining a leakage detection result of the battery pack according to the gas parameter.
The present application provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs a method in any of the foregoing alternative implementations.
The storage medium may be implemented by any type of volatile or nonvolatile Memory device or combination thereof, such as static random access Memory (Static Random Access Memory, SRAM), electrically erasable Programmable Read-Only Memory (Electrically Erasable Programmable Read-Only Memory, EEPROM), erasable Programmable Read-Only Memory (Erasable Programmable Read Only Memory, EPROM), programmable Read-Only Memory (PROM), read-Only Memory (ROM), magnetic Memory, flash Memory, magnetic disk, or optical disk.
The present application provides a computer program product which, when run on a computer, causes the computer to perform the method in any of the alternative implementations.
The present application provides a power device including an electronic device or a battery detection device as in the above embodiments. The power plant includes, but is not limited to, electrical devices for vehicles, ships or aircraft.
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 (15)

1. The battery detection equipment is characterized by comprising an inflation valve group, an exhaust valve group and a detection assembly;
the first end of the air charging valve group is used for being connected with external air charging equipment, and the second end of the air charging valve group is used for being connected with a battery pack;
one end of the exhaust valve group is connected with the second end of the inflation valve group;
And the detection assembly is used for responding to the closing of the inflation valve group and the opening of the exhaust valve group under the condition that the battery pack is completely inflated, and acquiring the gas parameters of the gas exhausted by the battery pack so as to determine the liquid leakage detection result of the battery pack according to the gas parameters.
2. The battery detection apparatus according to claim 1, wherein the detection assembly is specifically configured to:
determining that the detection assembly completes gas sensing correction, and under the condition that the battery pack completes gas filling, responding to closing of the gas filling valve group and opening of the gas discharging valve group, acquiring gas parameters of gas discharged by the battery pack, so as to determine a liquid leakage detection result of the battery pack according to the gas parameters;
the gas sensing correction is performed through gas parameters of gas in the first target object accessed by the detection component.
3. The battery detection apparatus according to claim 1 or 2, wherein the detection assembly is further configured to:
acquiring the current air pressure of the second end of the air charging valve group under the condition that the battery pack is in an air charging state;
and under the condition that the current air pressure reaches the preset air pressure, determining that the battery pack completes the inflation.
4. The battery detection apparatus according to claim 3, wherein the detection assembly is specifically configured to:
determining that the detection assembly completes pressure sensing correction, and acquiring the current air pressure of the second end of the air charging valve group under the condition that the battery pack is in an air charging state;
and the pressure sensing correction is performed according to the pressure output by the second target object connected with the detection assembly.
5. The battery detection device according to claim 1 or 2, wherein the detection assembly is specifically configured to:
according to the detection results of the gas parameters of each target gas in the gas exhausted by the battery pack, obtaining battery detection results corresponding to each target gas;
determining a liquid leakage detection result of the battery pack according to the battery detection result corresponding to each target gas;
the target gas is generated by the battery pack under the condition of liquid leakage.
6. The battery detection apparatus according to claim 5, wherein the detection assembly is specifically configured to:
and comparing the gas parameter of the target gas with at least one preset parameter corresponding to the target gas to obtain a battery detection result corresponding to the target gas.
7. The battery detection apparatus according to claim 6, wherein the preset parameter is determined according to a preset crack diameter, a preset time period, a pressure of the battery pack after the completion of the charging, a space of the battery pack, and a gas type of the target gas;
the detection component is specifically used for:
and comparing the gas parameter of the target gas with at least one preset parameter corresponding to the target gas to obtain the leakage duration of the target gas and the crack diameter of the battery pack for leakage of the target gas.
8. The battery detection apparatus according to any one of claims 1, 2, 4, 6 or 7, wherein the detection assembly is further configured to:
under the condition that the battery pack is completely inflated, responding to closing of the inflation valve group and the exhaust valve group, acquiring pressure difference between the second end of the inflation valve group and the first end of the battery pack, and obtaining an air tightness detection result of the battery pack according to the pressure difference.
9. The battery testing device of claim 8, further comprising a test valve block through which the second end of the inflation valve block is coupled to the battery pack;
The detection component is specifically used for:
under the condition that the battery pack is completely inflated, responding to closing of the inflation valve group, the test valve group and the exhaust valve group, and acquiring pressure difference between a first end and a second end of the test valve group so as to obtain an air tightness detection result of the battery pack according to the pressure difference.
10. The battery detection apparatus according to claim 8, wherein the detection assembly is specifically configured to:
comparing the pressure difference with a preset value to obtain an air tightness detection result of the battery pack;
the preset value is determined according to the critical diameter of the leakage hole of the battery pack, the test pressure corresponding to the air tightness level required to be achieved by the battery pack and the space of the battery pack.
11. A method of detecting a battery by a battery detection apparatus, characterized in that it is applied to the battery detection apparatus as claimed in any one of claims 1 to 10, the method comprising:
under the condition that the battery pack completes charging, responding to closing of the charging valve group and opening of the discharging valve group, and acquiring gas parameters of gas discharged by the battery pack;
and determining a leakage detection result of the battery pack according to the gas parameter.
12. Apparatus for detecting a battery by a battery detection device, applied to the battery detection device according to any one of claims 1 to 10, comprising:
the parameter acquisition module is used for responding to the closing of the gas charging valve group and the opening of the gas discharging valve group under the condition that the battery pack completes the charging, so as to acquire the gas parameters of the gas discharged by the battery pack;
and the battery detection module is used for determining the leakage detection result of the battery pack according to the gas parameter.
13. An electronic device comprising a processor and a memory storing a computer program, wherein the processor, when executing the computer program, implements the method of detecting a battery of the battery detection device of claim 11.
14. A computer-readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the method of detecting a battery by the battery detection device of claim 11.
15. A power plant comprising an electronic device as claimed in claim 13 or a battery detection device as claimed in any one of claims 1 to 10.
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