CN217276755U - Battery pack airtightness detection device - Google Patents
Battery pack airtightness detection device Download PDFInfo
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- CN217276755U CN217276755U CN202221031167.0U CN202221031167U CN217276755U CN 217276755 U CN217276755 U CN 217276755U CN 202221031167 U CN202221031167 U CN 202221031167U CN 217276755 U CN217276755 U CN 217276755U
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- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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Abstract
The utility model relates to a battery package gas tightness detection device, include: a first detection branch comprising a first gas tube having a downstream port configured to be in fluid communication with the cooling line and a first gas pressure sensor disposed in the first gas tube adjacent to the downstream port of the first gas tube; a second detection branch comprising a second gas tube having a downstream port configured to be in fluid communication with the battery chamber and a second gas pressure sensor and flow meter disposed in the second gas tube adjacent to the downstream port of the second gas tube; and a controller configured to control injection of the first gas into the cooling line via the first gas pipe and to determine gas tightness of the cooling line based on a gas pressure value detected by the first gas pressure sensor and injection of the second gas into the battery chamber via the second gas pipe and to determine gas tightness of the battery chamber based on a gas pressure value detected by the second gas pressure sensor and a gas flow value detected by the flow meter. The utility model provides a battery package gas tightness detection device compact structure and high-efficient safety.
Description
Technical Field
The utility model relates to a battery package detects technical field, more specifically, the utility model relates to a battery package gas tightness detection device.
Background
A battery pack is a core component of an electric vehicle, and in general, the battery pack includes a battery chamber defined by a housing, in which a plurality of battery modules, an electrical system associated with the plurality of battery modules, and a cooling line for cooling the plurality of battery modules, and the like are arranged, through which a cooling fluid (e.g., a cooling liquid) from a cooling fluid supply unit may be circulated. Since the components disposed in the battery compartment are mostly required to be operated in a substantially closed working environment, the airtightness of the battery compartment directly affects the operational performance and safety of the battery pack. In addition, it is also necessary to ensure airtightness of the cooling pipe to prevent the cooling fluid circulating through the cooling pipe from leaking into the battery chamber.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a compact structure and high-efficient safe battery package gas tightness detection device.
According to an aspect of the utility model, a battery package air tightness detection device is provided, wherein, the battery package includes the battery cavity and arranges the cooling line in the battery cavity, and battery package air tightness detection device includes: a first detection branch comprising: a first gas tube having a downstream port configured to be in fluid communication with the cooling circuit; and a first air pressure sensor disposed in the first air tube adjacent to the downstream port of the first air tube; a second detection branch comprising: a second gas tube having a downstream port configured to be in fluid communication with the battery chamber; and a second air pressure sensor and flow meter disposed in the second air conduit adjacent to the downstream port of the second air conduit; and a controller configured to: controlling injection of a first gas into the cooling line via the first gas pipe and determining airtightness of the cooling line based on a gas pressure value detected by the first gas pressure sensor; and controlling injection of a second gas into the battery chamber via the second gas pipe and determining airtightness of the battery chamber based on the gas pressure value detected by the second gas pressure sensor and the gas flow rate value detected by the flow meter.
Optionally, the first gas tube has an upstream port configured to be in fluid communication with a first gas source that produces a first gas, and the second gas tube has an upstream port configured to be in fluid communication with a second gas source that produces a second gas, wherein the first gas has a gas pressure value that is greater than the gas pressure value of the second gas.
Optionally, the battery pack tightness detection device further comprises a tee joint having a first interface, a second interface, and a third interface, wherein the first gas pipe has an upstream port in fluid communication with the first interface, and the second gas pipe has an upstream port in fluid communication with the second interface, and the third interface is configured to be in fluid communication with a common gas source, the common gas source generates an initial gas, a portion of the initial gas flowing through the first interface is used as the first gas, and a portion of the initial gas flowing through the second interface is used as the second gas; and wherein the second detection branch further comprises a pressure relief valve disposed in the second gas line adjacent to the upstream port of the second gas line, the pressure relief valve configured to reduce the pressure value of the second gas.
Optionally, the first detection branch further comprises a first pressure regulating valve disposed in the first gas pipe upstream with respect to the first gas pressure sensor, the first pressure regulating valve configured to regulate a gas pressure value of the first gas; and/or the second detection branch further comprises a second pressure regulating valve disposed in the second gas line upstream with respect to the second gas pressure sensor and the flow meter, the second pressure regulating valve configured to regulate a gas pressure value of the second gas.
Optionally, the first detection branch further comprises a first cut-off valve disposed in the first gas pipe upstream of the first gas pipe with respect to the first gas pressure sensor, the first cut-off valve being configured to be controlled by the controller to open and close to make the first gas pipe open and close, and the second detection branch further comprises a second cut-off valve disposed in the second gas pipe upstream of the second gas pipe with respect to the second gas pressure sensor, the second cut-off valve being configured to be controlled by the controller to open and close to make the second gas pipe open and close.
Optionally, the controller is further configured to: opening a first stop valve to open a first gas pipe to allow the first gas to be injected into the cooling pipeline through the first gas pipe; closing the first cutoff valve to block the first gas pipe to prevent the first gas from being injected into the cooling line through the first gas pipe in a state where the gas pressure value detected by the first gas pressure sensor is equal to a first threshold value; and judging the airtightness of the cooling line based on the air pressure value detected by the first air pressure sensor after the first shut-off valve is closed; and opening a second cutoff valve to open a second gas pipe to allow the second gas to be injected into the battery chamber via the second gas pipe, and judging airtightness of the battery chamber according to the gas flow value in a state where the gas pressure value detected by the second gas pressure sensor remains equal to a second threshold value.
Optionally, the controller is further configured to close the first cutoff valve to block the first air pipe and close the second cutoff valve to block the second air pipe in a state where the air pressure value detected by the second air pressure sensor is equal to or greater than a third threshold value, wherein the third threshold value is less than the first threshold value and greater than the second threshold value.
Optionally, the first detection branch further comprises a first bypass having an upstream port in fluid communication with the first air duct and a downstream port in fluid communication with ambient air, and a third shut-off valve disposed in the first bypass, the third shut-off valve being configured to be opened and closed by the controller to open and close the first bypass; and the second detection branch further comprises a second bypass having an upstream port in fluid communication with the second air pipe and a downstream port in fluid communication with ambient air, and a fourth shutoff valve provided in the second bypass, the fourth shutoff valve being configured to be opened and closed by the controller to open and close the second bypass.
Optionally, the controller is further configured to: opening a third shutoff valve to open the first bypass to allow the first gas to be discharged to the ambient air via the first bypass in a state where the air pressure value detected by the first air pressure sensor is equal to or greater than a fourth threshold value; and opening the fourth cutoff valve to open the second bypass to allow the second gas to be discharged to the ambient air via the second bypass in a state where the air pressure value detected by the second air pressure sensor is equal to or greater than a fifth threshold value.
Optionally, the cooling conduit comprises an inlet and an outlet, and the downstream port of the first gas duct comprises a first port and a second port in fluid communication with each other, the first port being configured to be hermetically connected to the inlet and the second port being configured to be hermetically connected to the outlet; and/or the battery chamber is defined by a housing on which at least one opening to the battery chamber is arranged and to which the downstream port of the second air duct is configured to be connected air-tightly.
The utility model provides a battery package gas tightness detection device can carry out the gas tightness detection of cooling tube way and battery cavity simultaneously. During the detection of the air-tightness of the battery pack, it is required that the value of the air pressure in the cooling pipe into which the first gas is injected is maintained in the range of 0-4bar to effectively detect the air-tightness of the cooling pipe, and that the value of the air pressure in the battery chamber into which the second gas is injected is maintained in the range of 0-3.5kpa to effectively detect the air-tightness of the battery chamber. Thus, in comparison, a first gas is required to have a high pressure value and a second gas is required to have a low pressure value, and the high pressure value of the first gas is at least hundreds times greater than the low pressure value of the second gas. When there is a leak in the cooling line, the first gas will be vented into the battery chamber, significantly affecting the value of the gas pressure detected by the second gas pressure sensor. By acquiring the air pressure value detected by the second air pressure sensor, it is possible to judge not only the airtightness of the battery chamber but also, at the same time, judge more sensitively and more rapidly whether or not there is a leak in the cooling line to prevent, with high response, the discharge of the first gas having a high air pressure value into the battery chamber to damage the housing defining the battery chamber and other components disposed in the battery chamber.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic structural view of a battery pack airtightness detection apparatus according to an embodiment of the present invention.
Fig. 2 is a schematic structural view of a battery pack airtightness detection apparatus according to another embodiment of the present invention.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: unless specifically stated otherwise, the relative arrangement of parts and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention.
Techniques and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be considered a part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
It should also be noted that: the terms "upstream" and "downstream" are defined herein in terms of the direction of flow of gas in the respective gas tubes and by-passes.
Referring to fig. 1 and 2, for example, the battery pack 10 includes a battery compartment 14 defined by a housing 12, a plurality of battery modules disposed in the battery compartment 14, an electrical system associated with the plurality of battery modules, and a cooling duct 16 for cooling the plurality of battery modules. When the battery pack 10 is normally operated, cooling fluid (e.g., cooling liquid) from a cooling fluid supply unit (not shown) may enter the cooling line 16 from the inlet 16a of the cooling line 16 and then return to the cooling fluid supply unit from the outlet 16b of the cooling line 16 to form a cooling fluid circulation loop. The inlet 16a and the outlet 16b of the cooling line 16 may be arranged on the housing 12 so as to be hermetically connected to the supply port and the recovery port of the cooling fluid supply unit, respectively. In addition, at least one opening (two openings 18a, 18b are shown in fig. 1 and 2) is also disposed in the housing 12 to the battery compartment 14, which can be used to mount a vent member such as an explosion-proof valve when the battery pack 10 is in normal operation.
The utility model provides a battery package gas tightness detection device 20 includes the first branch of measuring 20a (defined by the chain line in fig. 1 and 2) that is used for the gas tightness of cooling pipe 16 to detect and the second branch of measuring 20b (defined by the chain line in fig. 1 and 2) that is used for the gas tightness of battery chamber 14 to detect, and can carry out the gas tightness of cooling pipe 16 and battery chamber 14 simultaneously and detect.
The first detection branch 20a comprises a first air duct 22, the downstream port of which 22 can be in fluid communication with the cooling circuit 16 during the detection of the tightness of the battery pack. For example, as shown in fig. 1 and 2, the downstream port of the first air tube 22 may include a first port 22a and a second port 22b in fluid communication with each other, the first port 22a being configured to be hermetically connected to the inlet 16a of the cooling line 16, and the second port 22b being configured to be hermetically connected to the outlet 16b of the cooling line 16. In an alternative embodiment not shown, the downstream port of the first air duct 22 is connected hermetically only to one of the inlet 16a and the outlet 16b of the cooling circuit 16, while the other of the inlet 16a and the outlet 16b of the cooling circuit 16 will be blocked by an additional plug. Thus, under the assumption that there is no leak in the cooling circuit 16, the cooling circuit 16 will be in fluid communication with only the first gas tube 22.
The second detection branch 20b comprises a second gas tube 26, the downstream port of which 26 can be in fluid communication with the battery chamber 14 during the detection of the tightness of the battery pack. For example, the downstream port of the second air tube 26 is configured to be hermetically connected to the at least one opening (to which a vent member such as an explosion-proof valve has not been installed) to the battery chamber 14 disposed on the housing 12, and in the case of the two openings 18a, 18b shown in fig. 1 and 2, the downstream port of the second air tube 26 may include a third port 26a and a fourth port 26b that are in fluid communication with each other, the third port 26a being configured to be hermetically connected to one opening 18a of the two openings 18a, 18b, and the fourth port 26b being configured to be hermetically connected to the other opening 18b of the two openings 18a, 18 b. In an alternative embodiment not shown, the downstream port of the second air duct 26 is connected airtight to only one of the two openings 18a, 18b, while the other of the two openings 18a, 18b is to be blocked by an additional plug. Thus, under the assumption that there is no leak from the battery chamber 14, the battery chamber 14 will be in fluid communication with only the second air tube 26.
The battery pack airtightness detection apparatus 20 further includes a controller (not shown). The controller is configured to: controlling the injection of the first gas into the cooling circuit 16 via the first gas pipe 22, and judging the airtightness of the cooling circuit 16 based on the gas pressure value detected by the first gas pressure sensor 24; and controlling the injection of the second gas into the battery chamber 14 via the second gas pipe 26, and judging the airtightness of the battery chamber 14 based on the gas pressure value detected by the second gas pressure sensor 28 and the gas flow rate value detected by the flow meter 30.
During the cell pack airtightness detection, the value of the gas pressure in the cooling pipe 16 into which the first gas is injected is required to be kept in the range of 0 to 4bar in order to effectively detect the airtightness of the cooling pipe 16, and the value of the gas pressure in the cell chamber 14 into which the second gas is injected is required to be kept in the range of 0 to 3.5kpa in order to effectively detect the airtightness of the cell chamber 14. Thus, in comparison, a first gas is required to have a high pressure value, a second gas is required to have a low pressure value, and the high pressure value of the first gas is at least hundreds times greater than the low pressure value of the second gas.
Referring to fig. 1, during a battery pack tightness test, the upstream port 22c of the first gas tube 22 may be in fluid communication with a first gas source, such as a first air compressor 34 in combination with a first oil and water filter 34a, which generates a first gas at startup that may be filtered by the first oil and water filter 34a before entering the first gas tube 22, and the upstream port 26c of the second gas tube 26 may be in fluid communication with a second gas source, such as a second air compressor 36 in combination with a second oil and water filter 36a, which generates a second gas at startup that may be filtered by the second oil and water filter 36a before entering the first gas tube 22.
Referring to FIG. 2, in another embodiment, the first and second air tubes 22, 26 may be supplied by a common air supply, such as a third air compressor 38 in combination with a third oil and water filter 38 a. To this end, the battery pack airtightness detection apparatus 20 further includes a three-way joint 40 having a first port 40a, a second port 40b, and a third port 40c, wherein the upstream port 22c of the first gas pipe 22 is hermetically connected to the first port 40a to be in fluid communication with the first port 40a, the upstream port 26c of the second gas pipe 26 is hermetically connected to the second port 40b to be in fluid communication with the second port 40b, and the third port 40c may be hermetically connected to a common gas source to be in fluid communication with the common gas source during the battery pack airtightness detection. The common gas source generates the initial gas, which may be filtered through the third oil-water filter 38a and then enter the three-way joint 40, wherein the portion of the initial gas flowing through the first port 40a is used as the first gas and the portion of the initial gas flowing through the second port 40b is used as the second gas. In this case, the value of the pressure of the first gas and the value of the pressure of the second gas are both high, and in order to reduce the value of the pressure of the second gas, the second detection branch 20b also comprises a pressure reducing valve 42 arranged in the second gas pipe 26 adjacent to the upstream port 26c of the second gas pipe 26. The pressure relief valve 42 may be a mechanical pressure relief valve or any other suitable type of pressure relief valve.
Referring to fig. 1 and 2, the first detection branch 20a further includes a first pressure regulating valve 44 disposed in the first gas pipe 22 upstream of the first gas pipe 22 with respect to the first gas pressure sensor 24, the first pressure regulating valve 44 being capable of regulating a gas pressure value of the first gas. The first pressure regulating valve 44 may be a digital pressure regulating valve or any other suitable type of pressure regulating valve to precisely regulate the pressure value of the first gas.
Optionally, the second detection branch 20b further comprises a second pressure regulating valve 46 disposed in the second gas pipe 26 upstream of the second gas pipe 26 with respect to the second gas pressure sensor 28 and the flow meter 30, the second pressure regulating valve 46 being capable of regulating the gas pressure value of the second gas. It will be appreciated that the second pressure regulating valve 46 should be located downstream of the pressure reducing valve 42 as shown in figure 2. The second pressure regulating valve 46 may be a digital pressure regulating valve or any other suitable pressure regulating valve to precisely regulate the pressure value of the second gas.
Referring to fig. 1 and 2, the first detection branch 20a further includes a first shut-off valve 48 provided in the first air pipe 22 at an upstream of the first air pipe 22 with respect to the first air pressure sensor 24, the first shut-off valve 48 being configured to be opened and closed by the controller to open and close the first air pipe 22. The second detection branch 20b further includes a second cut-off valve 50 provided in the second air pipe 26 at an upstream of the second air pipe 26 with respect to the second air pressure sensor 28, the second cut-off valve 50 being configured to be opened and closed by the controller to make and break the second air pipe 26. It will be appreciated that although the second shut-off valve 50 is shown in fig. 2 as being downstream of the pressure reducing valve 42, the second shut-off valve 50 may alternatively be upstream of the pressure reducing valve 42. It will also be appreciated that while the first shut-off valve 48 is shown in fig. 1 and 2 as being downstream of the first pressure regulating valve 44, the first shut-off valve 48 may alternatively be upstream of the first pressure regulating valve 44; and while the second shut-off valve 50 is shown in fig. 1 and 2 as being downstream of the second pressure regulating valve 46, the second shut-off valve 50 may alternatively be upstream of the second pressure regulating valve 46. The first and second shut-off valves 48, 50 may be solenoid valves or any other suitable type of valve so that their opening and closing are controlled by the controller independently of each other.
As described above, the present invention provides a battery pack airtightness detection apparatus 20 which can simultaneously detect the airtightness of the cooling pipe 16 and the battery chamber 14, for example, can detect the airtightness of the cooling pipe 16 by a known differential pressure method using the first detection branch 20a, and can simultaneously detect the airtightness of the battery chamber 14 by a known flow method using the second detection branch 20 b.
To this end, during the detection of the air tightness of the battery pack, the controller is configured to open the first shut-off valve 48 so as to open the first gas pipe 22 to allow the first gas to be continuously injected (for example, 60-180s) into the cooling line 16 via the first gas pipe 22, the pressure value in the cooling line 16 into which the first gas is injected being continuously increased and reflected by the pressure value detected by the first gas pressure sensor 24. In a state where the value of the air pressure detected by the first air pressure sensor 24 is equal to the first threshold value, the first shutoff valve 48 is closed to block the first air pipe 22 to prevent the first gas from being injected into the cooling circuit 16 via the first air pipe 22, and the airtightness of the cooling circuit 16 is judged according to the value of the air pressure detected by the first air pressure sensor 24 after the first shutoff valve 48 is closed.
Specifically, based on the known differential pressure method, after closing the first shut-off valve 48, if there is no leak in the cooling line 16, the first gas in the cooling line 16 will be completely sealed, and the gas pressure value detected by the first gas pressure sensor 24 will also be substantially maintained at the first threshold value for a period of time (e.g., 60 s). Conversely, if there is a leak in the cooling circuit 16, the value of the air pressure detected by the first air pressure sensor 24 will gradually decrease over the period of time.
It will be understood that the first threshold value will be selected from the range of 0-4bar, which requires the pressure value in the cooling circuit 16 injected with the first gas to be maintained, and that the first pressure regulating valve 44 can regulate the pressure value of the first gas to be equal to or slightly greater than the first threshold value.
Meanwhile, during the battery pack airtightness detection, the controller is configured to open the second shut-off valve 50 so that the second gas pipe 26 is opened to allow the second gas to be continuously injected (for example, 60-180s) into the battery chamber 14 via the second gas pipe 26, and the gas pressure value in the battery chamber 14 into which the second gas is injected is continuously increased and reflected by the gas pressure value detected by the second gas pressure sensor 28. The airtightness of the battery chamber 14 can be judged based on the gas flow rate value in a state where the gas pressure value detected by the second gas pressure sensor 28 remains substantially equal to the second threshold value.
In particular, since, in addition to the at least one opening to the battery chamber 14, an inlet 16a and an outlet 16b of the cooling line 16, as well as other electrical interfaces for the electrical system, etc., are arranged on the housing 12 defining the battery chamber 14, the battery chamber 14 cannot be completely sealed, but rather has a reasonable leakage. Therefore, based on the known flow method, in a state where the second shut-off valve 50 is not closed and the gas pressure value detected by the second gas pressure sensor 28 remains substantially equal to the second threshold value, if the leakage of the battery chamber 14 is reasonable, the gas flow value will remain within the desired range for a period of time (e.g., 60s), and if the leakage of the battery chamber 14 is abnormal, the gas flow value will exceed the desired range for the period of time (e.g., 60 s).
It is understood that the second threshold value will be selected from the range of 0-3.5kpa, which requires the gas pressure value in the battery chamber 14 into which the second gas is injected to be maintained, and the second pressure regulating valve 46 may regulate the gas pressure value of the second gas to be equal to or slightly greater than the second threshold value.
Optionally, the controller is further configured to close the first shut-off valve 48 to block the first air pipe 22 and close the second shut-off valve 50 to block the second air pipe 26 in a state where the air pressure value detected by the second air pressure sensor 28 is equal to or greater than a third threshold value.
Specifically, if there is a leak in the cooling line 16, the first gas will vent into the battery chamber 14, significantly affecting the pressure value detected by the second pressure sensor 28. In a state where the value of the gas pressure detected by the second gas pressure sensor 28 is equal to or greater than the third threshold value, it may be judged that there is a leak in the cooling line 16 and it is necessary to prevent the first gas from being further discharged into the battery chamber 14 to damage the housing 12 defining the battery chamber 14 and other components disposed in the battery chamber 14.
It is understood that the third threshold is set based on the value of the air pressure that may damage the housing 12 and other components, and that the third threshold is less than the first threshold and greater than the second threshold. Thus, the second air pressure sensor 28 may assist the first air pressure sensor 24 to more sensitively and more quickly determine whether there is a leak in the cooling circuit 16.
Referring to fig. 1 and 2, the first detection branch 20a further includes a first bypass 52 and a third shut-off valve 54 provided in the first bypass 52, the first bypass 52 having an upstream port 52a in fluid communication with the first air duct 22 and a downstream port 52b in fluid communication with ambient air, the third shut-off valve 54 being controllable to open and close by the controller so that the first bypass 52 is opened and closed; and the second detection branch 20b further comprises a second bypass 56 and a fourth shut-off valve 58 disposed in the second bypass 56, the second bypass 56 having an upstream port 56a in fluid communication with the second air pipe 26 and a downstream port 56b in fluid communication with ambient air, the fourth shut-off valve 58 being controllable by the controller to open and close the second bypass 56.
For example, at the end of the pack airtightness detection, the first gas that has been injected into the cooling line 16 may be discharged to the ambient air by means of the first bypass 52 (for example, for a period of 30s), and the second gas that has been injected into the cell chamber 14 may be discharged to the ambient air by means of the second bypass 56 (for example, for a period of 30 s).
Additionally, the controller is configured to open the third shut-off valve 54 to open the first bypass 52 to allow the first gas to be discharged to the ambient air via the first bypass 52 in a state where the air pressure value detected by the first air pressure sensor 24 is greater than the fourth threshold value; and controls the fourth cut valve 58 to open the second bypass 56 in a state where the air pressure value detected by the second air pressure sensor 28 is greater than the fifth threshold value, to allow the second gas to be discharged to the ambient air via the second bypass 56. In this case, the first bypass 52 is used to secure the battery pack airtightness detecting process in the event of a failure of the first cutoff valve 48 and/or the first pressure regulating valve 44 in the first detection branch 20a, and the first bypass 52 is used to secure the battery pack airtightness detecting process in the event of a failure of the second cutoff valve 50 and/or the second pressure regulating valve 46 in the second detection branch 20 b. For example, the fourth threshold is greater than the first threshold. For example, the fifth threshold is greater than the second threshold.
It will be appreciated that although the upstream port of the first bypass 52 is shown in fig. 1 and 2 as being located between the first air pressure sensor 24 and the first shut-off valve 48 and the upstream port of the second bypass 56 is shown as being located between the second air pressure sensor 28 and the second shut-off valve 50, the upstream port of the first bypass 52 and the upstream port of the second bypass 56 may be located at other suitable locations.
Although some specific embodiments of the present invention have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustration only, and not for the purpose of limiting the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (10)
1. A battery pack airtightness detection apparatus (20), wherein the battery pack (10) includes a battery chamber (14) and a cooling pipe (16) arranged in the battery chamber (14), characterized in that the battery pack airtightness detection apparatus (20) comprises:
a first detection branch (20a) comprising:
a first air duct (22) having a downstream port configured to be in fluid communication with the cooling circuit (16); and
a first air pressure sensor (24) disposed in the first air pipe (22) adjacent to a downstream port of the first air pipe (22);
a second detection branch (20b) comprising:
a second air tube (26) having a downstream port configured to be in fluid communication with the battery chamber (14); and
a second air pressure sensor (28) and a flow meter (30) disposed in the second air pipe (26) adjacent to a downstream port of the second air pipe (26); and
a controller configured to:
controlling injection of a first gas into the cooling circuit (16) via a first gas pipe (22) and determining gas tightness of the cooling circuit (16) based on a gas pressure value detected by a first gas pressure sensor (24); and
the injection of the second gas into the battery chamber (14) via the second gas pipe (26) is controlled and the gas tightness of the battery chamber (14) is judged based on the gas pressure value detected by the second gas pressure sensor (28) and the gas flow value detected by the flow meter (30).
2. The battery pack tightness detection device (20) according to claim 1, wherein the first gas tube (22) has an upstream port (22c) configured to be in fluid communication with a first gas source (34), the first gas source (34) generating a first gas, and the second gas tube (26) has an upstream port (26c) configured to be in fluid communication with a second gas source (36), the second gas source (36) generating a second gas, wherein a pressure value of the first gas is greater than a pressure value of the second gas.
3. The battery pack airtightness detection apparatus (20) according to claim 1, further comprising a three-way joint (40) having a first port (40a), a second port (40b), and a third port (40c), wherein the first gas pipe (22) has an upstream port (22c) that is in fluid communication with the first port (40a), and the second gas pipe (26) has an upstream port (26c) that is in fluid communication with the second port (40b), and the third port (40c) is configured to be in fluid communication with a common gas source, the common gas source generates an initial gas, a portion of the initial gas that flows through the first port (40a) is used as the first gas, and a portion of the initial gas that flows through the second port (40b) is used as the second gas; and
wherein the second detection branch (20b) further comprises a pressure reducing valve (42) arranged in the second gas pipe (26) adjacent to the upstream port (26c) of the second gas pipe (26), the pressure reducing valve (42) being configured to reduce the gas pressure value of the second gas.
4. The battery pack tightness detection device (20) according to any one of claims 1 to 3, wherein the first detection branch (20a) further comprises a first pressure regulating valve (44) provided in the first air pipe (22) at an upstream of the first air pipe (22) with respect to the first air pressure sensor (24), the first pressure regulating valve (44) being configured to regulate an air pressure value of the first air; and/or
The second detection branch (20b) further comprises a second pressure regulating valve (46) arranged in the second gas pipe (26) upstream with respect to the second gas pressure sensor (28) and the flow meter (30), the second pressure regulating valve (46) being configured to regulate a gas pressure value of the second gas.
5. The battery pack airtightness detection apparatus (20) according to any one of claims 1 to 3, wherein the first detection branch (20a) further includes a first shut-off valve (48) provided in the first air pipe (22) at an upstream of the first air pipe (22) with respect to the first air pressure sensor (24), the first shut-off valve (48) being configured to be opened and closed by a controller so as to open and close the first air pipe (22), and
the second detection branch (20b) further includes a second cut-off valve (50) provided in the second air pipe (26) at an upstream of the second air pipe (26) with respect to the second air pressure sensor (28), the second cut-off valve (50) being configured to be opened and closed by the controller to open and close the second air pipe (26).
6. The battery pack airtightness detection apparatus (20) according to claim 5, wherein the controller is further configured to:
opening a first shut-off valve (48) to open the first gas line (22) to allow the first gas to be injected into the cooling line (16) via the first gas line (22); closing the first shut-off valve (48) to block the first gas pipe (22) in a state where the gas pressure value detected by the first gas pressure sensor (24) is equal to the first threshold value, to prevent the first gas from being injected into the cooling line (16) via the first gas pipe (22); and judging the airtightness of the cooling line (16) on the basis of the air pressure value detected by the first air pressure sensor (24) after the first shut-off valve (48) is closed; and
the second shut-off valve (50) is opened to open the second gas pipe (26) to allow the second gas to be injected into the battery chamber (14) via the second gas pipe (26), and the airtightness of the battery chamber (14) is judged from the gas flow rate value in a state where the gas pressure value detected by the second gas pressure sensor (28) remains equal to the second threshold value.
7. The battery pack airtightness detection apparatus (20) according to claim 6, wherein the controller is further configured to close the first cutoff valve (48) to block the first air pipe (22) and close the second cutoff valve (50) to block the second air pipe (26) in a state where the air pressure value detected by the second air pressure sensor (28) is equal to or greater than a third threshold value, wherein the third threshold value is smaller than the first threshold value and greater than the second threshold value.
8. The battery pack airtightness detection apparatus (20) according to any one of claims 1 to 3, wherein the first detection branch (20a) further includes a first bypass (52) and a third shutoff valve (54) provided in the first bypass (52), the first bypass (52) having an upstream port (52a) in fluid communication with the first air pipe (22) and a downstream port (52b) in fluid communication with ambient air, the third shutoff valve (54) being configured to be opened and closed by a controller so that the first bypass (52) is opened and closed; and
the second detection branch (20b) further comprises a second bypass (56) and a fourth shut-off valve (58) disposed in the second bypass (56), the second bypass (56) having an upstream port (56a) in fluid communication with the second air pipe (26) and a downstream port (56b) in fluid communication with ambient air, the fourth shut-off valve (58) being configured to be opened and closed by the controller to open and close the second bypass (56).
9. The battery pack airtightness detection apparatus (20) according to claim 8, wherein the controller is further configured to:
opening a third shut-off valve (54) to open a first bypass (52) to allow the first gas to be discharged to the ambient air via the first bypass (52) in a state where the air pressure value detected by the first air pressure sensor (24) is equal to or greater than a fourth threshold value; and
the fourth cut valve (58) is opened in a state where the air pressure value detected by the second air pressure sensor (28) is equal to or greater than a fifth threshold value to make the second bypass (56) open to allow the second gas to be discharged to the ambient air via the second bypass (56).
10. The battery pack airtightness detection apparatus (20) according to any one of claims 1 to 3, wherein the cooling line (16) includes an inlet (16a) and an outlet (16b), and the downstream port of the first air pipe (22) includes a first port (22a) and a second port (22b) that are in fluid communication with each other, the first port (22a) being configured to be hermetically connected to the inlet (16a), and the second port (22b) being configured to be hermetically connected to the outlet (16 b); and/or
The battery chamber (14) is defined by a housing (12), on the housing (12) at least one opening is arranged which opens into the battery chamber (14), and a downstream port of the second air duct (26) is configured to be air-tightly connected to the at least one opening.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221031167.0U CN217276755U (en) | 2022-04-29 | 2022-04-29 | Battery pack airtightness detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221031167.0U CN217276755U (en) | 2022-04-29 | 2022-04-29 | Battery pack airtightness detection device |
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| CN217276755U true CN217276755U (en) | 2022-08-23 |
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| CN202221031167.0U Active CN217276755U (en) | 2022-04-29 | 2022-04-29 | Battery pack airtightness detection device |
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