Battery pack air tightness testing method and related device

Abstract

The invention discloses a battery pack air tightness test method and a related device, complete air tightness test data can be obtained through incomplete air tightness test data of a battery pack and a corresponding mapping relation established in advance, the air tightness test time is saved, the battery pack production efficiency is improved, and the battery pack air tightness test efficiency is improved. And the investment of an airtight test cabinet can be reduced, and the cost is saved.

Description

Technical Field

[0001] The invention relates to a battery pack air tightness testing method and a related device, belonging to the field of air tightness testing. Background Art

[0002] As the scale of the electric vehicle market expands, power lithium-ion battery (hereinafter referred to as "battery") packs are manufactured on a large scale. In order to avoid abnormalities in electric vehicle batteries during driving, battery factories usually conduct offline tests on battery packs. Airtightness testing is one of them, and 100% full inspection is required. Therefore, the number of airtightness test cabinets will seriously restrict the production capacity of lithium-ion battery packs. In order to increase the production capacity of battery packs, it is necessary to improve the efficiency of airtightness testing, but there is no corresponding method at present. Summary of the invention

[0003] The present invention provides a battery pack air tightness testing method and related devices, which solve the problems disclosed in the background technology.

[0004] According to one aspect of the present disclosure, a battery pack air tightness testing method is provided, comprising: Obtain incomplete airtightness test data of the battery pack to be tested for airtightness under preset condition A; Obtaining complete air tightness test data of the battery pack to be tested for air tightness according to the incomplete air tightness test data of the battery pack to be tested for air tightness and the mapping relationship library; The mapping relationship library includes mapping relationships between incomplete airtightness test data and complete airtightness test data of pre-built samples, and the samples include various battery packs with airtightness problems and battery packs without airtightness problems; The pre-built process includes: Obtain data of incomplete airtightness test of samples under preset condition A; Obtain data of complete air tightness test of samples under preset condition A; According to the incomplete air tightness test data and the complete air tightness test data, a mapping relationship between the incomplete air tightness test data and the complete air tightness test data of the sample under preset condition A is constructed.

[0005] The method can obtain complete airtightness test data through incomplete airtightness test data of the battery pack and the corresponding pre- and post-constructed mapping relationship, which not only saves airtightness test time and improves battery pack production efficiency, but also reduces the investment in airtightness test cabinets and saves costs.

[0006] In some embodiments of the present disclosure, a complete air tightness test includes a pre-inflation stage, an inflation stage, a pressure balance stage, and a test stage in sequence; an incomplete air tightness test includes a pre-inflation stage and an inflation stage in sequence.

[0007] This method divides the complete airtightness test and the incomplete airtightness test into stages and standardizes them to facilitate unified large-scale airtightness testing during the production of battery packs.

[0008] In some embodiments of the present disclosure, the mapping relationship between the incomplete air tightness test data and the complete air tightness test data is a mapping relationship between the pressure at the end of the inflation stage in the incomplete air tightness test, the pressure at the end of the inflation stage in the complete air tightness test, and the pressure leakage at the end of the test stage in the complete air tightness test.

[0009] This method selects the pressure at the end of the inflation phase and the pressure leakage at the end of the test phase, which are easy to measure, and is more convenient for constructing a mapping relationship.

[0010] In some embodiments of the present disclosure, a complete air tightness test includes a pre-inflation stage, an inflation stage, a pressure-maintaining balance stage, and a testing stage in sequence; an incomplete air tightness test includes a pre-inflation stage, an inflation stage, and a pressure-maintaining balance stage in sequence.

[0011] This method divides the complete airtightness test and the incomplete airtightness test into stages and standardizes them to facilitate unified large-scale airtightness testing during the production of battery packs.

[0012] In some embodiments of the present disclosure, the mapping relationship between the incomplete air tightness test data and the complete air tightness test data is the mapping relationship between the pressure drop in the pressure maintaining balance stage in the incomplete air tightness test, the pressure drop in the pressure maintaining balance stage in the complete air tightness test, and the pressure leakage at the end of the test stage in the complete air tightness test.

[0013] This method selects the pressure drop in the pressure-maintaining balance stage and the pressure leakage at the end of the test stage, which are easy to measure, to make it easier to construct a mapping relationship.

[0014] According to another aspect of the present disclosure, a battery pack airtightness testing device is provided, comprising: An acquisition module is used to acquire incomplete airtightness test data of a battery pack to be tested for airtightness under preset condition A; A mapping module, which obtains complete air tightness test data of the battery pack to be tested for air tightness according to the incomplete air tightness test data of the battery pack to be tested for air tightness and a mapping relationship library; The mapping relationship library includes mapping relationships between incomplete airtightness test data and complete airtightness test data of pre-built samples, and the samples include various battery packs with airtightness problems and battery packs without airtightness problems; The pre-built process includes: Obtain data of incomplete airtightness test of samples under preset condition A; Obtain data of complete air tightness test of samples under preset condition A; According to the incomplete air tightness test data and the complete air tightness test data, a mapping relationship between the incomplete air tightness test data and the complete air tightness test data of the sample under preset condition A is constructed.

[0015] Similar to the above method, the device can obtain complete airtightness test data through the incomplete airtightness test data of the battery pack and the corresponding pre-constructed mapping relationship, which not only saves the airtightness test time and improves the battery pack production efficiency, but also reduces the investment in airtightness test cabinets and saves costs.

[0016] According to another aspect of the present disclosure, a computer-readable storage medium is provided, which stores one or more programs, and the one or more programs include instructions, which, when executed by a computing device, enable the computing device to perform a battery pack airtightness testing method.

[0017] Similar to the above method, the storage medium can obtain complete airtightness test data through the incomplete airtightness test data of the battery pack and the corresponding pre-constructed mapping relationship, which not only saves the airtightness test time and improves the battery pack production efficiency, but also reduces the investment in airtightness test cabinets and saves costs.

[0018] According to another aspect of the present disclosure, a computer device is provided, comprising one or more processors and one or more memories, wherein one or more programs are stored in the one or more memories and are configured to be executed by the one or more processors, and the one or more programs include instructions for executing a battery pack airtightness testing method.

[0019] Similar to the above method, the computer can obtain complete airtightness test data through the incomplete airtightness test data of the battery pack and the corresponding pre-built mapping relationship, which not only saves the airtightness test time and improves the battery pack production efficiency, but also reduces the investment in airtightness test cabinets and saves costs.

[0020] The beneficial effects achieved by the present invention are as follows: the present invention can obtain complete airtightness test data through incomplete airtightness test data of the battery pack and the corresponding pre- and post-constructed mapping relationship, which not only saves the airtightness test time and improves the production efficiency of the battery pack, but also reduces the investment in airtightness test cabinets and saves costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The figure is a flow chart of the battery pack air tightness test method; Figure 2 This is a schematic diagram of an incomplete airtightness test; Figure 3 This is a schematic diagram of a complete airtightness test; Figure 4 The block diagram of the battery pack air tightness test device. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. It is obvious that the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present disclosure and its application or use. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure.

[0023] Unless otherwise specified, the relative arrangement of components and steps, the numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present disclosure.

[0024] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0025] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0026] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0027] It should be noted that similar symbols and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it does not require further discussion in subsequent figures.

[0028] In order to solve the problem of low efficiency of airtightness testing, the present disclosure proposes a battery pack airtightness testing method and related devices, specifically, complete airtightness testing data can be obtained through incomplete airtightness testing data of the battery pack and corresponding pre- and post-constructed mapping relationships.

[0029] Figure 1 This is a schematic diagram of an embodiment of the battery pack air tightness testing method disclosed in the present invention. Figure 1 The embodiments may be executed by a test terminal.

[0030] like Figure 1 As shown, step 1 of the embodiment is to obtain incomplete airtightness test data of the battery pack to be tested for airtightness under preset condition A.

[0031] It should be noted that for the sake of standardization and to facilitate the unified large-scale air tightness test during the production of battery packs, the air tightness test of the battery pack is divided into the following stages, including the pre-charging stage, the inflation stage, the pressure balance stage and the test stage. In the pre-charging stage, the battery pack is charged from 0 to the preset maximum pressure with a constant pre-charging pressure, and then enters the inflation stage, jumping to a new constant inflation pressure inflation. In the inflation stage and the pressure balance stage, the pressure successfully reaches the preset maximum pressure and the pressure drop value reaches the preset minimum pressure. In the test stage, if there is a problem with air tightness, the pressure will continue to decrease.

[0032] An incomplete air tightness test is an incomplete air tightness test. Also for the sake of standardization, it is convenient for unified large-scale air tightness testing when producing battery packs. The incomplete air tightness test generally includes the first few stages of the air tightness test. Since the pre-charging stage conditions are preset, in some embodiments, the incomplete air tightness test includes the pre-charging stage and the inflation stage in sequence, or the incomplete air tightness test includes the pre-charging stage, the inflation stage and the pressure balance stage in sequence.

[0033] It should be noted that the preset condition A is a condition artificially defined according to the parameters of the battery pack during the test, such as the pre-charge pressure P1 (a constant pressure applied during the pre-charge stage), the preset maximum pressure Pmax (generally 3.0KPa<Pmax<3.5KPa), the preset minimum pressure Pmin (3.0KPa<Pmin<3.5KPa), and the inflation time of each stage.

[0034] return Figure 1 In step 2 of the embodiment, complete air tightness test data of the battery pack to be tested is obtained based on the incomplete air tightness test data of the battery pack to be tested and a mapping relationship library; wherein the mapping relationship library includes a mapping relationship between incomplete air tightness test data of pre-constructed samples and complete air tightness test data, and the samples include various battery packs with air tightness problems and battery packs without air tightness problems.

[0035] In an embodiment, the process of pre-constructing a mapping relationship may include: obtaining data of an incomplete airtightness test of a sample under preset condition A; obtaining data of a complete airtightness test of a sample under preset condition A; and constructing a mapping relationship between the incomplete airtightness test data and the complete airtightness test data of the sample under preset condition A based on the incomplete airtightness test data and the complete airtightness test data.

[0036] It should be noted that if the incomplete air tightness test includes a pre-inflation stage and an inflation stage in sequence, then the mapping relationship between the incomplete air tightness test data and the complete air tightness test data is the mapping relationship between the pressure at the end of the inflation stage in the incomplete air tightness test, the pressure at the end of the inflation stage in the complete air tightness test, and the pressure leakage at the end of the test stage in the complete air tightness test.

[0037] It should be noted that if the incomplete air tightness test includes the pre-inflation stage, the inflation stage and the pressure maintaining balance stage in sequence, then the mapping relationship between the incomplete air tightness test data and the complete air tightness test data is the mapping relationship between the pressure drop in the pressure maintaining balance stage in the incomplete air tightness test, the pressure drop in the pressure maintaining balance stage in the complete air tightness test, and the pressure leakage at the end of the test stage in the complete air tightness test.

[0038] It should be noted that in the test, the pressure at the end of the inflation stage, the pressure drop during the pressure balance stage, and the pressure leakage are all relatively obvious and easy to measure data, which makes it easier to construct a mapping relationship.

[0039] It should be noted that from the perspective of improving test efficiency, the shorter the time of the incomplete air tightness test is, the better. Therefore, the optimal incomplete air tightness test only includes the pre-inflation stage and the inflation stage. Of course, if in some special circumstances (it is impossible to build a mapping relationship through the data of the pre-inflation stage and the inflation stage), another incomplete air tightness test will be used.

[0040] The following takes the incomplete airtightness test that only includes the pre-inflation stage and the inflation stage as an example to further illustrate the construction process of the mapping relationship: Conduct non-complete airtightness test on the sample, see Figure 2 , fill the sample from 0 to P1 pressure to Pmax, jump to P2 to fill until the filling stage ends, record the pressure P3 at the end of the filling stage; remove the internal pressure of the sample and let it stand for 10 minutes, then conduct a complete air tightness test, see Figure 3 , inflate the sample from 0 to Pmax with pressure P1, jump to P2 to inflate until the end of the test phase, record the pressure P4 at the end of the inflation phase, and the pressure leakage △P at the end of the test phase; based on P3, P4 and △P, the factor relationship between the three can be constructed.

[0041] Another incomplete airtightness test constructs a similar mapping relationship, the difference being that the incomplete airtightness test ends at the pressure-maintaining equilibrium stage, and the recorded data are the difference between the end pressure of the pressure-maintaining equilibrium stage and P3, the difference between the end pressure of the pressure-maintaining equilibrium stage and P4, and the pressure leakage △P at the end of the test stage.

[0042] It should be noted that after the mapping relationships of all samples are obtained, a mapping relationship library can be constructed, and an incomplete airtightness test can be performed on the battery pack to be tested under the same conditions. The corresponding factor relationship can be found based on the incomplete airtightness test data, so that the complete airtightness test data can be obtained.

[0043] Assume that the battery pack to be tested for air tightness is subjected to an incomplete air tightness test, and the pressure at the end of the inflation stage is P3. If there is a mapping corresponding to the pressure P3 at the end of the inflation stage in the mapping relationship library, the pressure leakage at the end of the test stage can be directly obtained. If there is no mapping corresponding to P3, then a complete air tightness test is performed, and the mapping relationship between the test result and P3 is included in the mapping relationship library.

[0044] The above method can obtain complete airtightness test data through the incomplete airtightness test data of the battery pack and the corresponding pre- and post-constructed mapping relationship, which can save the airtightness test time, about 50%-60% of the airtightness test time, improve the battery pack production efficiency, and reduce the investment in airtightness test cabinets to save costs.

[0045] Figure 4 This is a schematic diagram of an embodiment of a battery pack air tightness testing device disclosed in the present invention. Figure 4 The embodiment of the present invention is a virtual device which can be loaded and executed by a test terminal (such as a computer), and includes an acquisition module and a mapping module.

[0046] The acquisition module of the embodiment is configured to acquire incomplete airtightness test data of the battery pack to be airtightness tested under preset condition A.

[0047] The mapping module of the embodiment is configured to obtain the complete airtightness test data of the battery pack to be tested for airtightness according to the incomplete airtightness test data of the battery pack to be tested for airtightness and the mapping relationship library; The mapping relationship library includes mapping relationships between incomplete airtightness test data and complete airtightness test data of pre-built samples, and the samples include various battery packs with airtightness problems and battery packs without airtightness problems; The pre-built process includes: Obtain data of incomplete airtightness test of samples under preset condition A; Obtain data of complete air tightness test of samples under preset condition A; According to the incomplete air tightness test data and the complete air tightness test data, a mapping relationship between the incomplete air tightness test data and the complete air tightness test data of the sample under preset condition A is constructed.

[0048] Similar to the above method, the device can obtain complete airtightness test data through the incomplete airtightness test data of the battery pack and the corresponding pre-constructed mapping relationship, which not only saves the airtightness test time and improves the battery pack production efficiency, but also reduces the investment in airtightness test cabinets and saves costs.

[0049] Based on the same technical solution, the present disclosure also relates to a computer-readable storage medium, which stores one or more programs, and the one or more programs include instructions. When the instructions are executed by a computing device, the computing device executes a battery pack airtightness testing method.

[0050] Similar to the above method, the storage medium can obtain complete airtightness test data through the incomplete airtightness test data of the battery pack and the corresponding pre-constructed mapping relationship, which not only saves the airtightness test time and improves the battery pack production efficiency, but also reduces the investment in airtightness test cabinets and saves costs.

[0051] Based on the same technical solution, the present disclosure also relates to a computer device, comprising one or more processors and one or more memories, one or more programs stored in the one or more memories and configured to be executed by the one or more processors, and the one or more programs include instructions for executing a battery pack air tightness testing method.

[0052] Similar to the above method, the computer can obtain complete airtightness test data through the incomplete airtightness test data of the battery pack and the corresponding pre-built mapping relationship, which not only saves the airtightness test time and improves the battery pack production efficiency, but also reduces the investment in airtightness test cabinets and saves costs.

[0053] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0054] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0055] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0056] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0057] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the scope of the claims of the present invention to be approved.

Claims

1. A battery pack air tightness testing method, characterized in that: include: Obtain incomplete airtightness test data of the battery pack to be tested for airtightness under preset condition A; Obtaining complete air tightness test data of the battery pack to be tested for air tightness according to the incomplete air tightness test data of the battery pack to be tested for air tightness and the mapping relationship library; The mapping relationship library includes mapping relationships between incomplete airtightness test data and complete airtightness test data of pre-built samples, and the samples include various battery packs with airtightness problems and battery packs without airtightness problems; The pre-built process includes: Obtain data of incomplete airtightness test of samples under preset condition A; Obtain data of complete air tightness test of samples under preset condition A; According to the incomplete air tightness test data and the complete air tightness test data, a mapping relationship between the incomplete air tightness test data and the complete air tightness test data of the sample under preset condition A is constructed.

2. The battery pack air tightness testing method according to claim 1, characterized in that: The complete air tightness test includes the pre-inflation stage, the inflation stage, the pressure balance stage and the test stage in sequence; the incomplete air tightness test includes the pre-inflation stage and the inflation stage in sequence.

3. The battery pack air tightness testing method according to claim 2, characterized in that: The mapping relationship between the incomplete air tightness test data and the complete air tightness test data is the mapping relationship between the pressure at the end of the inflation phase in the incomplete air tightness test, the pressure at the end of the inflation phase in the complete air tightness test, and the pressure leakage at the end of the test phase in the complete air tightness test.

4. The battery pack air tightness testing method according to claim 1, characterized in that: The complete air tightness test includes the pre-inflation stage, the inflation stage, the pressure-maintaining balance stage and the testing stage in sequence; the incomplete air tightness test includes the pre-inflation stage, the inflation stage and the pressure-maintaining balance stage in sequence.

5. The battery pack air tightness testing method according to claim 4, characterized in that: The mapping relationship between the incomplete air tightness test data and the complete air tightness test data is the mapping relationship between the pressure drop in the pressure balance stage in the incomplete air tightness test, the pressure drop in the pressure balance stage in the complete air tightness test, and the pressure leakage at the end of the test stage in the complete air tightness test.

6. A battery pack air tightness test device, characterized in that: include: An acquisition module is used to acquire incomplete airtightness test data of a battery pack to be tested for airtightness under preset condition A; A mapping module, which obtains complete air tightness test data of the battery pack to be tested for air tightness according to the incomplete air tightness test data of the battery pack to be tested for air tightness and a mapping relationship library; The mapping relationship library includes mapping relationships between incomplete airtightness test data and complete airtightness test data of pre-built samples, and the samples include various battery packs with airtightness problems and battery packs without airtightness problems; The pre-built process includes: Obtain data of incomplete airtightness test of samples under preset condition A; Obtain data of complete air tightness test of samples under preset condition A; According to the incomplete air tightness test data and the complete air tightness test data, a mapping relationship between the incomplete air tightness test data and the complete air tightness test data of the sample under preset condition A is constructed.

7. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores one or more programs, and the one or more programs include instructions. When the instructions are executed by a computing device, the computing device executes any one of the methods of claims 1 to 5.

8. A computer device, characterized in that: include: One or more processors and one or more memories, one or more programs are stored in the one or more memories and are configured to be executed by the one or more processors, and the one or more programs include instructions for executing any of the methods described in claims 1 to 5.

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