Battery pack liquid leakage detection system
Through the battery pack leakage detection system, the gas in the battery pack is pumped to the gas storage tank and secondary sampling analysis is performed, which solves the problem of misjudgment in the existing detection methods and realizes accurate detection of the battery pack leakage.
Patent Information
- Application Number
- CN202421445190.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-21
- Publication Date
- 2025-03-21
- Estimated Expiration
- 2034-06-21
AI Technical Summary
The existing battery-packing liquid leakage detection methods have misjudgment problems, including the leakage gas being discharged into the atmosphere and the fact that some electrolytes at the leakage point cannot be extracted to the detection port due to the sealing internal structure of the enclosure.
A battery pack leakage detection system is provided, including an analyzer, an air storage tank and a first pump body. By pumping the gas in the battery pack to the gas storage tank, and sampling and analysis are performed under high negative pressure state, the gas in the gas storage tank is then returned to the battery pack, gas disturbance and mixing is performed, and the secondary sampling and analysis is performed under low negative pressure state to determine whether there is leakage.
By discharging the gas in the battery pack to the gas storage tank for secondary sampling analysis, misjudgment of detection caused by hole blockage in traditional tests is avoided; sufficient flow disturbs the mixed gas, so that the leaked liquid at the closed leakage point can be detected, solving the misjudgment problem caused by the complex internal structure of the battery pack.
Smart Images
Figure CN222652461U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the field of battery pack leakage detection, and in particular, to a battery pack leakage detection system. Background Art
[0002] The detection of liquid leakage inside the battery pack is an important part of the safe use of the battery pack. In the relevant technology, when detecting the liquid leakage of the battery pack, the battery pack itself is usually regarded as a closed cavity, and the gas inside the battery pack is evacuated and discharged into the atmosphere through a rough pump. When the preset negative pressure is reached, sampling and analysis are started. However, this detection method has the following main disadvantages: ① There is liquid leakage inside the package, and the leaked liquid naturally evaporates in the gas inside the package. If the leak hole is blocked by electrolyte crystallization, it can no longer leak. During the rough vacuum action, the gas containing the leaked liquid component is discharged into the atmosphere. During the sampling analysis, the leaked liquid component cannot be detected, resulting in misjudgment; ② The internal structure of the battery pack is relatively complex. The electrolyte at some leakage points cannot be pumped to the detection port due to the closed internal structure of the package, so it cannot be detected, resulting in misjudgment. Utility Model Content
[0003] The purpose of the present disclosure is to provide a battery pack leakage detection system to at least partially solve the problems existing in the related art.
[0004] In order to achieve the above-mentioned objectives, the present disclosure provides a battery pack leakage detection system, comprising: an analyzer, used to connect to a battery pack; a gas storage tank, used to connect to the battery pack, the gas storage tank and the analyzer are not connected to each other; and a first pump body, used to pump the gas in the battery pack to the gas storage tank.
[0005] Optionally, a second pump body is also included for pumping out the gas in the gas storage tank.
[0006] Optionally, the second pump body is used to pump the gas in the gas tank to the battery pack, or to pump the gas in the gas tank to the external environment.
[0007] Optionally, it also includes: a first pipeline, one end of which is connected to the air outlet of the air storage tank and the other end is connected to the air inlet of the second pump body; a second pipeline, one end of which is connected to the air outlet of the second pump body and the other end is used to connect to the air inlet of the battery pack; and a third pipeline, one end of which is connected to the second pipeline and the other end is used to connect to the external environment, wherein the second pipeline is provided with a first valve and the third pipeline is provided with a second valve.
[0008] Optionally, it further includes a first pressure detection device for detecting the internal pressure of the gas storage tank, and the signal of the first pressure detection device is connected to the second valve to control the second valve to close when the internal pressure of the gas storage tank is less than a first preset threshold.
[0009] Optionally, it also includes: a fourth pipeline, one end of which is connected to the air inlet of the analyzer and the other end is used to connect to the air outlet of the battery pack; a fifth pipeline, one end of which is connected to the fourth pipeline and the other end is connected to the air inlet of the first pump body; and a sixth pipeline, one end of which is connected to the air outlet of the first pump body and the other end is connected to the air inlet of the gas storage tank, wherein the sixth pipeline is provided with a third valve.
[0010] Optionally, it further includes a second pressure detection device for detecting the internal pressure of the battery pack, and the second pressure detection device signal is connected to the third valve to control the third valve to close when the internal pressure of the battery pack is less than a second preset threshold.
[0011] Optionally, the fourth pipeline is provided with a fourth valve.
[0012] Optionally, the analyzer is a mass spectrometer.
[0013] Optionally, the analyzer includes a main body and a third pump body for pumping the gas in the battery pack into the main body.
[0014] Through the above technical solution, when it is necessary to detect the leakage of the battery pack, the gas in the battery pack is first pumped to the gas storage tank through the first pump body, and then the analyzer is controlled to sample and analyze the gas in the battery pack in a high negative pressure state. After the analysis, the gas in the gas storage tank is discharged into the battery pack to disrupt and evenly mix the gas in the battery pack. Alternatively, the gas can be controlled by the first pump body to circulate continuously between the battery pack and the gas storage tank so that the gas in the battery pack can be fully disturbed and mixed, and then the analyzer is controlled to perform secondary sampling and analysis on the gas in the battery pack in a low negative pressure state to determine whether there is leakage. By discharging the gas in the battery pack to the gas storage tank for secondary sampling and analysis, the problem of discharging the gas in the battery pack to the outside during traditional testing and the leakage point no longer leaking due to crystal blockage can be avoided. By fully flowing, disturbing and mixing the gas in the battery pack, the leaked liquid at the relatively closed leakage point can be carried to the gas outlet of the battery pack by the flowing gas so that it can be detected. This avoids the problem of misjudgment caused by traditional measurement where the electrolyte at some leakage points cannot be drawn to the detection port due to the complex internal structure of the battery and the closed internal structure of the pack.
[0015] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:
[0017] Figure 1 is a schematic diagram of a battery pack leakage detection system exemplarily shown according to the present disclosure.
[0018] Description of Reference Numerals
[0019] 100-analyzer; 110-main body; 120-third pump body; 200-battery pack; 300-gas tank; 400-first pump body; 500-second pump body; 610-first pipeline; 620-second pipeline; 630-third pipeline; 640-fourth pipeline; 650-fifth pipeline; 660-sixth pipeline; 710-first valve; 720-second valve; 730-third valve; 740-fourth valve. DETAILED DESCRIPTION
[0020] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.
[0021] In the present disclosure, unless otherwise stated, the directional terms "inside" and "outside" used are defined based on the structure of the relevant components themselves. For example, a first pressure detection device for detecting the "internal" pressure of a gas tank refers to a device for detecting the pressure of the space for storing gas inside the gas tank.
[0022] In addition, in the present disclosure, the terms "first", "second", etc. are used to distinguish one element from another element, and have no order or importance. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.
[0023] Reference Figure 1 The present disclosure exemplarily provides a battery pack leakage detection system, including an analyzer 100 for connecting to a battery pack 200, a gas tank 300 for connecting to the battery pack 200, and a first pump body 400 for pumping gas in the battery pack 200 to the gas tank 300, wherein the gas tank 300 and the analyzer 100 are not connected to each other. In an embodiment of the present disclosure, the gas tank 300 and the analyzer 100 may share a main pipeline to connect to the battery pack 200. Alternatively, the gas tank 300 and the analyzer 100 may also be connected to the battery pack 200 through their respective corresponding pipelines.
[0024] The present disclosure does not limit the type of the analyzer 100, which may be, for example, a mass spectrometer as described below. Alternatively, in some other embodiments, it may also be a gas chromatograph, as long as it can sample and detect the gas in the battery pack 200 and analyze whether the battery pack 200 is leaking. The analyzer 100 and the battery pack 200 may be connected by a pipeline to achieve gas sampling.
[0025] The gas storage tank 300 may be external to the battery pack 200 and may be used to store the gas in the battery pack 200 and discharge the battery pack gas stored therein back into the battery pack 200. It should be noted that the process of discharging the gas in the gas storage tank 300 back to the battery pack 200 and the process of discharging the gas in the battery pack 200 to the gas storage tank 300 may be implemented using the same pipeline, or may be implemented through respective corresponding pipelines, and the present disclosure does not limit this.
[0026] The present disclosure does not limit the type of the first pump body 400, which can be a gear pump, a piston pump, a screw pump, etc., as long as it can realize the pumping of the gas in the battery pack 200 into the gas tank 300. It should be explained that when the gas in the battery pack 200 is pumped into the gas tank 300, the gas tank 300 can be pre-exhausted to a negative pressure state. Alternatively, in some other embodiments, an exhaust hole can also be preset in the gas tank 300, and the exhaust hole is arranged away from the air inlet of the gas tank 300, so that when the gas in the battery pack 200 enters the gas tank 300 through the air inlet, the original gas in the gas tank 300 can be discharged through the exhaust hole. The present disclosure does not limit this, and will be described in detail below.
[0027] By using the above technical solution, when it is necessary to detect the leakage of the battery pack 200, the gas in the battery pack 200 is first pumped to the gas storage tank 300 through the first pump body 400, and then the analyzer 100 is controlled to sample and analyze the gas in the battery pack 200 in a high negative pressure state. After the analysis is completed, the battery pack gas stored in the gas storage tank 300 is discharged back into the battery pack 200, and the gas flowing back can disturb and evenly mix the gas in the battery pack, or the first pump body 400 can be used to control the gas to circulate continuously between the battery pack 200 and the gas storage tank 300 so that the gas in the battery pack 200 can be fully disturbed and mixed. Then the analyzer 100 is controlled to perform a secondary sampling analysis on the gas in the battery pack 200 in a low negative pressure state to determine whether there is leakage. By discharging the gas in the battery pack 200 to the gas storage tank 300 for secondary sampling and analysis, the problem of misjudgment caused by the leakage point no longer leaking due to crystallization blockage when the gas in the battery pack 200 is discharged to the outside during traditional testing can be avoided. The gas in the battery pack 200 is fully flowed, disturbed and mixed, so that the leaking liquid at the relatively closed leakage point can be carried to the gas outlet of the battery pack 200 by the flowing gas so that it can be detected, avoiding the problem of misjudgment caused by the electrolyte at some leakage points cannot be drawn to the detection port due to the closed internal structure of the battery pack 200 during traditional measurement due to the complex internal structure of the battery pack 200.
[0028] Reference Figure 1 In an embodiment of the present disclosure, the battery pack leakage detection system may further include a second pump body 500 for pumping out the gas in the gas tank 300. With such a design, before the gas in the battery pack 200 is pumped into the gas tank 300, the original gas in the gas tank 300 may be discharged through the second pump body 500, so that the gas tank 300 is in a negative pressure state, thereby facilitating the pumping of the gas in the battery pack 200 into the gas tank 300, and reducing the dilution of the gas in the battery pack 200 and the outflow of the gas in the battery pack 200. In other words, by discharging the gas tank 300 to a negative pressure state, there is no need to open an exhaust hole in the gas tank 300 in the process of pumping the gas in the battery pack 200 into the gas tank 300, and all the gas in the battery pack 200 can be stored in the gas tank 300. It should be noted that the amount of exhaust gas discharged from the gas tank 300 through the second pump body 500 can be determined according to the negative pressure bearing capacity of the gas tank 300 and the volume of gas pumped into the gas tank 300 by the battery pack 200.
[0029] The present disclosure does not limit the type of the second pump body 500 , which may be a gear pump, a piston pump, a screw pump, etc., as long as it can discharge the gas in the gas storage tank 300 to put the gas storage tank 300 in a negative pressure state.
[0030] Further, in the embodiment of the present disclosure, the second pump body 500 can be used to pump the gas in the gas tank 300 to the battery pack 200, or to pump the gas in the gas tank 300 to the external environment. With such a design, before the analyzer 100 performs sampling and testing, the gas in the gas tank 300 can be pumped to the external environment through the second pump body 500, so that the gas tank 300 is in a negative pressure state, thereby facilitating the pumping of the gas in the battery pack 200 to the gas tank 300. After the analyzer 100 completes the high negative pressure sampling and testing of the gas in the battery pack 200, the battery pack gas in the gas tank 300 can be pumped to the battery pack 200 through the second pump body 500 to complete the reflux, so that the analyzer 100 can perform secondary sampling and testing on the battery pack 200 in a low negative pressure state. In addition to using the same "second pump body 500" to achieve the above-mentioned two functions, in some other embodiments, two pump bodies can be provided to discharge the gas in the gas storage tank 300 to the external environment and the battery pack 200 respectively.
[0031] It should be explained that the aforementioned “external environment” refers to the space outside the connected sealed space formed by the gas storage tank 300 and the battery pack 200, which can be discharged directly into the atmosphere, or can be discharged into other collection cavities, for example.
[0032] In order to enable the second pump body 500 to select and switch between the above two functions, refer to Figure 1 In the embodiment of the present disclosure, the battery pack leakage detection system may further include: a first pipeline 610, one end of which is connected to the gas outlet of the gas storage tank 300 and the other end is connected to the gas inlet of the second pump body 500; a second pipeline 620, one end of which is connected to the gas outlet of the second pump body 500 and the other end is used to connect to the gas inlet of the battery pack 200; and a third pipeline 630, one end of which is connected to the second pipeline 620 and the other end is used to connect to the external environment. The second pipeline 620 may be provided with a first valve 710, and the third pipeline 630 may be provided with a second valve 720. With such a design, when it is necessary to discharge the gas in the gas tank 300 to the external environment, the second valve 720 can be opened and the first valve 710 can be closed, and the gas in the gas tank 300 can be discharged to the external environment through the first pipeline 610, part of the second pipeline 620 and the third pipeline 630; when it is necessary to discharge the gas in the gas tank 300 to the battery pack 200, the second valve 720 can be closed and the first valve 710 can be opened, and the gas in the gas tank 300 can be discharged to the battery pack 200 through the first pipeline 610 and the second pipeline 620. In addition to switching by setting two valves, in some other embodiments, the second valve 720 can be cancelled, and the first valve 710 can be configured as a three-way valve, the third pipeline 630 can be connected to the second pipeline 620 through the three-way valve, and the gas flow direction can be controlled by the three-way valve.
[0033] It should be explained that the aforementioned “bypass” refers to connecting the third pipeline 630 to the side wall of the second pipeline 620 so that the gas in the second pipeline 620 can flow to the third pipeline 630. This can be achieved by a three-way valve or welding. In order to avoid redundancy, the “bypass” will not be explained again below.
[0034] Reference Figure 1 In an embodiment of the present disclosure, the battery pack leakage detection system may further include a first pressure detection device for detecting the internal pressure of the gas tank 300. The first pressure detection device may be connected to the second valve 720 by signal so as to control the second valve 720 to close when the internal pressure of the gas tank 300 is less than the first preset threshold. With such a design, it is possible to avoid excessive negative pressure inside the gas tank 300, which may cause damage to the gas tank 300, or cause the internal gas of the battery pack 200 to be excessively pumped into the gas tank 300, which may cause damage to the battery pack 200. The present disclosure does not impose any restrictions on the first preset threshold, which may be adaptively designed according to the pressure resistance of the gas tank 300 and the battery pack 200. In an embodiment of the present disclosure, the aforementioned "signal connection" may be an electrical connection, an infrared connection, or the like.
[0035] Reference Figure 1 In an embodiment of the present disclosure, the battery pack leakage detection system may further include: a fourth pipeline 640, one end of which is connected to the air inlet of the analyzer 100 and the other end is used to connect to the air outlet of the battery pack 200; a fifth pipeline 650, one end of which is connected to the fourth pipeline 640 and the other end is connected to the air inlet of the first pump body 400; and a sixth pipeline 660, one end of which is connected to the air outlet of the first pump body 400 and the other end is connected to the air inlet of the gas storage tank 300. Among them, the sixth pipeline 660 may be provided with a third valve 730. With such a design, when it is necessary to pump the gas in the battery pack 200 into the gas storage tank 300, the third valve 730 may be opened so that the gas in the battery pack 200 can enter the gas storage tank 300 through part of the fourth pipeline 640, the fifth pipeline 650, the first pump body 400 and the sixth pipeline 660 in sequence. After the exhaust is completed, the third valve 730 can be closed, and the analyzer 100 can be started so that the gas in the battery pack 200 can enter the analyzer 100 through the fourth pipeline 640. In addition, in some other embodiments, the fifth pipeline 650 can also be directly connected to the battery pack 200. In this case, the battery pack 200 needs to be provided with two gas outlets to correspond to the gas storage tank 300 and the analyzer 100 respectively.
[0036] Furthermore, in order to prevent the gas in the battery pack 200 from being excessively pumped to the gas storage tank 300 so that the negative pressure in the battery pack 200 is too large, in an embodiment of the present disclosure, the battery pack leakage detection system may further include a second pressure detection device for detecting the internal pressure of the battery pack 200, and the second pressure detection device may be connected to the third valve 730 by signal, so as to control the third valve 730 to close when the internal pressure of the battery pack 200 is less than the second preset threshold. Here, the second preset threshold may be adaptively designed according to the pressure resistance of the battery pack 200. The "signal connection" may be an electrical connection or an infrared connection.
[0037] The present disclosure does not limit the aforementioned first pressure detection device and the second pressure detection device, for example, they may be pressure sensors.
[0038] Reference Figure 1 In an embodiment of the present disclosure, the fourth pipeline 640 may be provided with a fourth valve 740. With such a design, the fourth valve 740 may be opened when the analyzer 100 needs to take a sample, and the fourth valve 740 may be closed when sampling is not required, so as to avoid the negative pressure of the battery pack 200 affecting the analyzer 100.
[0039] The present disclosure does not limit the above-mentioned “first valve 710 ”, “second valve 720 ”, “third valve 730 ” and “fourth valve 740 ”, which may be stop valves, etc., as long as they can control the on-off of the corresponding pipelines.
[0040] As described above, the present disclosure does not limit the type of the analyzer 100 . For example, in an embodiment of the present disclosure, the analyzer 100 may be a mass spectrometer.
[0041] In an embodiment of the present disclosure, the analyzer 100 may include a body portion 110 and a third pump body 120 for pumping the gas in the battery pack 200 to the body portion 110. The third pump body 120 may be a molecular pump. Since the structure and principle of the mass spectrometer are well known to those skilled in the art, no further introduction is given here.
[0042] Finally, in order to facilitate the understanding of this technical solution, Figure 1 The working process of the detection system provided by the present disclosure is described in detail, specifically:
[0043] When the battery pack 200 needs to be leak tested, the third valve 730 and the first valve 710 are first closed, the second valve 720 is opened, and the second pump body 500 is started to discharge the gas in the gas storage tank 300 to the external environment. Then the first valve 710, the second valve 720 and the fourth valve 740 are closed, the third valve 730 is opened, and the first pump body 400 is started to pump the gas in the battery pack 200 into the gas storage tank 300, so that the battery pack 200 reaches a high negative pressure state that meets the measurement conditions, and the first pump body 400 and the third valve 730 are closed. Then the fourth valve 740 is opened and the analyzer 100 is started to perform a sampling test on the battery pack 200. After the detection is completed, the third valve 730 and the first valve 710 are opened, the second valve 720 is closed, and the first pump body 400 and the second pump body 500 are started, so that the battery pack gas in the gas tank 300 flows back to the battery pack 200 through the first pipeline 610 and the second pipeline 620, and continues to enter the gas tank 300 through part of the fourth pipeline 640, the fifth pipeline 650 and the sixth pipeline 660, so that the battery pack gas circulates, so that the battery pack gas can be fully disturbed and mixed, so as to bring out the leaked liquid at various positions in the battery pack 200. At this time, the fourth valve 740 is opened and the analyzer 100 is started to perform secondary sampling detection on the battery pack 200 in a low negative pressure state, and the leakage situation in the battery pack 200 is comprehensively judged based on the results of the two sampling tests.
[0044] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.
[0045] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. For example, in order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.
[0046] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.
Claims
1. A battery pack leakage detection system, characterized in that: include: Analyzer, used to connect the battery pack; A gas storage tank, used to be connected to the battery pack, and the gas storage tank is not connected to the analyzer; as well as The first pump body is used to pump the gas in the battery pack to the gas storage tank.
2. The battery pack leakage detection system according to claim 1, characterized in that: It also includes a second pump body for pumping out the gas in the gas storage tank.
3. The battery pack leakage detection system according to claim 2, characterized in that: The second pump body is used to pump the gas in the gas tank to the battery pack, or to pump the gas in the gas tank to the external environment.
4. The battery pack leakage detection system according to claim 3, characterized in that: Also includes: A first pipeline, one end of which is connected to the air outlet of the air storage tank and the other end of which is connected to the air inlet of the second pump body; a second pipeline, one end of which is connected to the air outlet of the second pump body and the other end of which is used to connect to the air inlet of the battery pack; as well as A third pipeline has one end connected to the second pipeline and the other end connected to the external environment. Wherein, the second pipeline is provided with a first valve, and the third pipeline is provided with a second valve.
5. The battery pack leakage detection system according to claim 4, characterized in that: It also includes a first pressure detection device for detecting the internal pressure of the gas storage tank, and the first pressure detection device signal is connected to the second valve to control the second valve to close when the internal pressure of the gas storage tank is less than a first preset threshold.
6. The battery pack leakage detection system according to claim 1, characterized in that: Also includes: a fourth pipeline, one end of which is connected to the air inlet of the analyzer and the other end of which is connected to the air outlet of the battery pack; a fifth pipeline, one end of which is connected to the fourth pipeline and the other end of which is connected to the air inlet of the first pump body; and a sixth pipeline, one end of which is connected to the air outlet of the first pump body and the other end of which is connected to the air inlet of the air storage tank, Wherein, the sixth pipeline is provided with a third valve.
7. The battery pack leakage detection system according to claim 6, characterized in that: It also includes a second pressure detection device for detecting the internal pressure of the battery pack, and the second pressure detection device signal is connected to the third valve to control the third valve to close when the internal pressure of the battery pack is less than a second preset threshold.
8. The battery pack leakage detection system according to claim 6, characterized in that: The fourth pipeline is provided with a fourth valve.
9. The battery pack leakage detection system according to claim 1, characterized in that: The analyzer is a mass spectrometer.
10. The battery pack leakage detection system according to claim 9, characterized in that: The analyzer includes a body portion and a third pump body for pumping gas in the battery pack to the body portion.