Battery detection device, battery detection method and system

Abstract

The invention relates to a battery detection device and a battery detection method and system.In the detection process, an adapter can be controlled to be opened, so that a collection cavity communicates with a to-be-detected battery, and at the moment, gas in the to-be-detected battery flows into the collection cavity; the gas within the collection chamber may then be collected or directly detected by a working device. Therefore, through the battery detection device, stable and effective detection can be provided for the interior of the to-be-detected battery. Due to the detachable design between the collecting body and the adapter, the working equipment can provide detection service for a plurality of to-be-detected batteries by disassembling the collecting body, and the utilization rate of the device is improved. And the adapter is communicated with the to-be-tested battery in an openable and closable manner, so that when the collection body is detached from the adapter, the adapter can be closed, and the air tightness in the to-be-tested battery is not damaged. Therefore, multiple times of effective detection in the life cycle of the to-be-detected battery can be conveniently realized.

Description

Technical Field

[0001] The present application relates to the technical field of battery testing, and in particular to a battery testing device, a battery testing method and a system. Background Art

[0002] Batteries generate gas during use, which causes excessive pressure inside the battery, resulting in battery swelling, etc. Therefore, monitoring the pressure changes inside the battery and analyzing the composition of the generated gas are important for understanding the aging reaction of the battery. However, due to the structural design defects of traditional detection devices, it is either impossible to monitor the performance of the same battery under test at different stages; or the utilization rate of the detection device is low and it is impossible to provide detection services for multiple batteries under test. Summary of the invention

[0003] Based on this, it is necessary to provide a battery detection device, a battery detection method and a system, which can realize multiple effective detections within the life cycle of the battery to be tested; at the same time, the utilization rate is high, which is convenient for providing detection services for multiple batteries to be tested.

[0004] In a first aspect, the present application provides a battery detection device, which includes: a detection mechanism, including a collecting body and a working device connected to the collecting body, the collecting body having a collecting chamber; an adapter, which is detachably connected to the collecting body and connected to the collecting chamber, the adapter is used to be openably and closably connected to the battery to be tested, and the working equipment is used to collect and / or detect the gas in the collecting chamber.

[0005] During the detection process, the above-mentioned battery detection device can control the adapter to open so that the collection chamber is connected to the battery to be tested. At this time, the gas in the battery to be tested will flow into the collection chamber; then, the gas in the collection chamber can be collected or directly detected by the working equipment. In this way, the battery detection device of the present application can provide stable and effective detection for the inside of the battery to be tested. Since the collection body and the adapter are designed to be detachable, the collection body can be disassembled so that the working equipment can provide detection services for multiple batteries to be tested, thereby improving the utilization rate of the device. Since the adapter can be connected to the battery to be tested in an openable and closable manner, when the collection body is removed from the adapter, the adapter can be closed so that the airtightness inside the battery to be tested is not destroyed, and the battery to be tested can operate normally. This makes it easier for the working equipment to monitor the performance of the same battery to be tested in different stages, and to achieve multiple effective detections during the life cycle of the battery to be tested.

[0006] In some embodiments, the battery detection device further includes an on-off valve, which is used to open and close the adapter to connect or disconnect the battery to be tested with the collection chamber. In this way, the on-off valve is arranged on the adapter to facilitate the control of the opening and closing of the adapter, making the internal detection of the battery to be tested more convenient.

[0007] In some embodiments, the detection mechanism further includes a connector, which is connected to the collection body and communicates with the collection chamber, and is used to connect to the suction device. In this way, the connection head is provided to facilitate vacuuming in the collection chamber, reduce the residual gas in the collection chamber and the working equipment, reduce the impact on the internal gas detection of the battery to be tested, and improve the reliability of the detection result.

[0008] In some embodiments, the connector has a suction port for the suction device to communicate with, and the suction port is connected to the collection chamber. With this design, the suction port facilitates the suction device to communicate with the collection chamber, and facilitates the suction device to vacuum the collection chamber.

[0009] In some embodiments, the opening area of ​​the suction port is denoted as S1, where 0.196 cm 2 ≤S1≤3.14cm 2 In this way, the reasonable design of the size of the suction port can not only improve the vacuuming effect, but also reduce the loss of internal gas in the battery under test during the testing process, and reduce the impact on the normal use of the battery under test.

[0010] In some embodiments, the opening area S1 also satisfies the following conditions: 0.502 cm 2 ≤S1≤0.785cm 2 In this way, the size of the suction port is further optimized, so that the battery detection device can more effectively take into account both the vacuuming effect and the low loss of gas inside the battery to be tested.

[0011] In some embodiments, the working device includes a first working component, which is connected to the collecting body and is used to collect the gas in the collecting chamber. In this way, the first working component is used to stably obtain the gas in the collecting chamber, which is convenient for analyzing the composition of the gas in the battery to be tested, and is conducive to improving the convenience of the detection process.

[0012] In some embodiments, the first working component includes a collecting body and a piston disposed in the collecting body, the collecting body is connected to the collecting body, and the piston is configured to slide along the axis of the collecting body. In this way, the first working component is designed as a collecting body and a piston, so that the first working component can collect gas more conveniently, which is conducive to improving detection efficiency.

[0013] In some embodiments, the battery detection component further includes a first control valve, which is used to control the connection or disconnection between the first working component and the collection chamber. In this way, the first control valve is provided to control the flow of gas between the first working component and the collection chamber, so as to accurately control the amount of gas collected in the first working component, thereby reducing the loss of gas in the battery to be tested while meeting the amount required for detection.

[0014] In some embodiments, the working device includes a second working component, which is connected to the collecting body and is used to detect the pressure value of the gas in the collecting chamber. In this way, by setting the second working component, the air pressure in the collecting chamber can be obtained in a timely and effective manner to obtain the air pressure in the battery to be tested.

[0015] In some embodiments, the battery detection assembly further includes a second control valve, which is used to control the connection or disconnection between the second working assembly and the collection chamber. Thus, the second control valve is provided to control the flow of gas between the second working assembly and the collection chamber, so as to facilitate the controllable detection of the gas pressure inside the battery to be tested.

[0016] In some embodiments, the volume of the collection chamber satisfies the condition that it is greater than or equal to 5 cm 3 And less than or equal to 30cm 3 In this way, the volume of the collection chamber is controlled at 5cm 3 ~30cm 3 In the premise of ensuring convenient assembly, the residual amount in the gas detection process is reduced as much as possible, thereby reducing the impact on the normal use of the battery to be tested.

[0017] In some embodiments, the volume of the collection chamber also satisfies the following conditions: greater than or equal to 10 cm 3 And less than or equal to 15cm 3 In this way, the volume of the collection chamber is further limited to 10cm 3 ~15cm 3 In this way, the impact of the detection process on the battery to be tested is further reduced.

[0018] In some embodiments, the collecting body is provided with a connection port connected to the collecting chamber, and the connection port is connected to the adapter, so that the gas in the battery to be tested can flow into the collecting chamber through the connection port, so as to complete the detection in the battery to be tested.

[0019] In some embodiments, a working device is connected to one end of the collector along a preset direction and away from the connection port, and the height of the collector in the preset direction is recorded as h, where 5cm≤h≤20cm. In this way, the height h is controlled within the range of 5cm to 20cm, which is convenient for shortening the size of the collection chamber, reducing the gas residue in the collection chamber, and reducing the impact of the detection process on the battery to be tested.

[0020] In some embodiments, the height h also satisfies the condition: 6 cm ≤ h ≤ 10 cm. Thus, further controlling the height h within the range of 6 cm to 10 cm is beneficial to further reduce the residual gas in the collection chamber.

[0021] In a second aspect, the present application provides a battery detection method, which adopts any of the above battery detection devices, and the battery detection method includes the following steps: controlling the adapter to open so that the battery to be tested is connected to the collection chamber through the adapter; using working equipment to collect and / or detect the gas in the collection chamber.

[0022] In some embodiments, the method also includes: controlling the adapter to close to disconnect the connection between the battery to be tested and the collection chamber; controlling the working equipment to be connected to the collection chamber; vacuuming the collection chamber, and stopping vacuuming after a preset time.

[0023] In some embodiments, the step of collecting and / or detecting the gas in the collection chamber using the working device includes: using the first working component of the working device to collect the gas in the collection chamber to perform component analysis on the collected gas. In this way, the collection chamber is evacuated to reduce the residual gas in the collection chamber and the working device, reduce the impact on the gas detection inside the battery to be tested, and improve the reliability of the detection result.

[0024] In some embodiments, the step of collecting and / or detecting the gas in the collection chamber using the working device includes: obtaining the pressure value of the gas in the collection chamber using the second working component of the working device. In this way, the gas in the collection chamber is stably obtained, which facilitates the component analysis of the gas in the battery to be tested, and is conducive to improving the convenience of the detection process.

[0025] In a third aspect, the present application provides a battery detection system, which includes a battery to be tested and any of the above battery detection devices.

[0026] In some embodiments, the battery to be tested is provided with an injection port for injecting electrolyte, and the adapter is connected to the injection port. In this way, the adapter is directly arranged at the injection port, which can save the need to open a hole on the battery to be tested, reduce damage to the battery structure to be tested, and help improve the stability of the structure while meeting the effective detection of the battery to be tested. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of the exploded structure of a battery to be tested provided in some embodiments of the present application.

[0028] Figure 2 A schematic diagram of the structure of a battery detection device provided in some embodiments of the present application.

[0029] Figure 3 for Figure 2 Schematic diagram of the internal structure of the battery detection device shown.

[0030] Figure 4 for Figure 2 A schematic diagram of the structure of the first working component is shown.

[0031] Figure 5 Schematic diagram of the battery detection method provided in some embodiments of the present application Figure 1 .

[0032] Figure 6 Schematic diagram of the battery detection method provided in some embodiments of the present application Figure 2 .

[0033] Figure 7 Schematic diagram of the cooperation between the end cap and the adapter provided in some embodiments of the present application.

[0034] 100, battery testing device; 10, testing mechanism; 11, collecting body; 111, collecting chamber; 112, first component; 113, second component; 114, connecting component; 115, connecting port; 12, working equipment; 121, first working assembly; 12a, collecting body; 12b, piston; 12c, push rod; 122, second working assembly; 123, first control valve; 124, second control valve; 13, connector; 131, suction port; 20, adapter; 21, on-off valve; X, axial direction; 200, battery to be tested; 210, end cover; 220, electrode terminal; 230, electrode assembly; 240, shell; 250, liquid injection port. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0036] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0037] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0038] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0039] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0040] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0041] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0042] Batteries generate gas during use, which can lead to excessive pressure inside the battery, causing battery swelling and even safety risks. Therefore, monitoring the pressure changes inside the battery and analyzing the composition and patterns of the generated gas are of great significance to understanding the battery aging reaction process.

[0043] Traditional detection devices are mainly divided into two categories. One type uses the screw of the pressure sensor to push open the explosion-proof valve and extend into the battery to collect internal battery data during the detection process. The other type opens a through hole at the upper end of the battery, and extends the lower end of the air duct through the sealing unit and the through hole in turn to the inner cavity of the battery.

[0044] The first type of detection device needs to push open the explosion-proof valve, which will damage the structure of the battery and make it impossible to continue to use it normally. This makes it impossible for the detection device to detect the internal air pressure or gas composition of the battery in other stages, and it is impossible to achieve multiple effective detections during the life cycle of the battery to be tested.

[0045] Although the second type of detection device does not destroy the airtightness of the overall structure of the battery, the detection device cannot be separated from the battery. Once separated, the airtightness of the tested battery will be destroyed, resulting in the detection device being only suitable for testing a single battery, and the device utilization rate is low.

[0046] Based on this, in order to effectively solve the problem that traditional detection devices cannot take into account multiple detections within the life cycle of a single battery and provide detection services for multiple batteries to be tested, the present application provides a battery detection device. During the detection process, the adapter can be controlled to open so that the collection chamber is connected to the battery to be tested. At this time, the gas in the battery to be tested will flow into the collection chamber; then, the gas in the collection chamber can be collected or directly detected by the working equipment. In this way, the battery detection device of the present application can provide stable and effective detection for the inside of the battery to be tested. Due to the detachable design between the collection body and the adapter, the collection body can be disassembled so that the working equipment can provide detection services for multiple batteries to be tested, thereby improving the utilization rate of the device.

[0047] Since the adapter can be connected to the battery under test in an openable and closable manner, when the collector is removed from the adapter, the adapter can be closed so that the airtightness inside the battery under test is not damaged, and the battery under test can operate normally. This makes it easier for the working equipment to monitor the performance of the same battery under test at different stages, and to achieve multiple effective tests within the life cycle of the battery under test.

[0048] The battery 200 to be tested mentioned in this application may also be referred to as a battery cell. Figure 1 , Figure 1 Schematic diagram of the exploded structure of the battery 200 to be tested provided in some embodiments of the present application. Figure 1The battery 200 to be tested includes an end cover 210, a shell 240, a battery cell assembly and other functional components.

[0049] The end cap 210 refers to a component that covers the opening of the shell 240 to isolate the internal environment of the battery 200 to be tested from the external environment. Without limitation, the shape of the end cap 210 can be adapted to the shape of the shell 240 to match the shell 240. Optionally, the end cap 210 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 210 is not easily deformed when squeezed and collided, so that the battery 200 to be tested can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals 220 can be provided on the end cap 210. The electrode terminal 220 can be used to be electrically connected to the electrode assembly 230 for outputting or inputting electrical energy of the battery 200 to be tested. In some embodiments, the end cap 210 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery 200 to be tested reaches a threshold value. The material of the end cap 210 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the present embodiment. In some embodiments, an insulating member can also be provided on the inner side of the end cap 210, and the insulating member can be used to isolate the electrical connection component 114 in the housing 240 from the end cap 210 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.

[0050] The shell 240 is a component used to cooperate with the end cap 210 to form the internal environment of the battery 200 to be tested, wherein the formed internal environment can be used to accommodate the electrode assembly 230, the electrolyte and other components. The shell 240 and the end cap 210 can be independent components, and an opening can be set on the shell 240, and the internal environment of the battery 200 to be tested is formed by covering the opening with the end cap 210 at the opening. Without limitation, the end cap 210 and the shell 240 can also be integrated. Specifically, the end cap 210 and the shell 240 can form a common connection surface before other components are put into the shell, and when it is necessary to encapsulate the interior of the shell 240, the end cap 210 covers the shell 240. The shell 240 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 240 can be determined according to the specific shape and size of the electrode assembly 230. The shell 240 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0051] The electrode assembly 230 is a component in the battery 200 to be tested where an electrochemical reaction occurs. One or more electrode assemblies 230 may be included in the housing 240. The electrode assembly 230 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the electrode assembly 230, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute a tab. The positive electrode tab and the negative electrode tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tabs are connected to the electrode terminals 220 to form a current loop.

[0052] According to some embodiments of this application, please refer to Figure 2 The present application provides a battery detection device 100, which includes: a detection mechanism 10 and an adapter 20. The detection mechanism 10 includes a collection body 11 and a working device 12 connected to the collection body 11, and the collection body 11 has a collection chamber 111. The adapter 20 is detachably connected to the collection body 11 and communicated with the collection chamber 111. The adapter 20 is used to be openably connected to the battery 200 to be tested, and the working device 12 is used to collect and / or detect the gas in the collection chamber 111.

[0053] The collector 11 refers to a structure with a space inside, which can discharge the gas inside the battery 200 to be tested, so as to detect the gas inside the battery 200 to be tested.

[0054] The working device 12 refers to a device that can collect the gas in the collection chamber 111; or a device that can directly detect the gas in the collection chamber 111. When the working device 12 is a device that collects the gas in the collection chamber 111, it can be, but not limited to, a vessel structure such as a tube, a box, or a cylinder. The gas collected at this time can be analyzed for components by an external detection device. When the working device 12 is a device that can directly detect the gas in the collection chamber 111, it can be, but not limited to, an air pressure detection device, a gas composition analysis device, etc.

[0055] The adapter 20 is a structure that can directly guide the gas inside the battery 200 to be tested. There are many ways to connect the adapter 20 to the inside of the battery 200 to be tested, for example, the adapter 20 can be directly installed in the original hole structure on the battery 200 to be tested, such as the injection hole, etc.; or an additional hole can be drilled in the battery 200 to be tested, and the adapter 20 can be sealed and installed in the hole, etc.

[0056] The adapter 20 can be connected to the battery 200 to be tested in an openable and closable manner, which should be understood as the adapter 20 can be opened or closed on the battery 200 to be tested. When the adapter 20 is opened, the adapter 20 is connected to the inside of the battery 200 to be tested. When the adapter 20 is closed, the adapter 20 is disconnected from the inside of the battery 200 to be tested. At this time, after the collection body 11 is separated from the adapter 20, the overall structure of the battery 200 to be tested still remains in a sealed state, which does not affect the normal use of the battery 200 to be tested.

[0057] There are many ways to open and close the adapter 20 on the battery 200 to be tested. For example, a plug structure can be set on the adapter 20. When the collection body 11 is separated from the adapter 20, the plug structure can be inserted into one end of the adapter 20; or, the adapter 20 can be provided with a valve structure.

[0058] In addition, "detachable connection" means that after the two structures are separated, the original connection function between the two will not be destroyed, that is, the two structures can be connected again. For example, the detachable connection can be but not limited to threaded connection, bolt connection, clamping connection, etc.

[0059] By disassembling the collecting body 11, the working device 12 can provide detection services for multiple batteries 200 to be tested, thereby improving the utilization rate of the device. At the same time, the adapter 20 can also be closed so that the airtightness inside the battery 200 to be tested is not damaged, and the battery 200 to be tested can operate normally. This makes it easier for the working device 12 to monitor the performance of the same battery 200 to be tested at different stages, and to achieve multiple effective detections within the life cycle of the battery 200 to be tested.

[0060] According to some embodiments of the present application, optionally, please refer to Figure 2 The battery detection device 100 further includes an on-off valve 21. The on-off valve 21 is used to open and close the adapter 20 to connect or disconnect the battery 200 to be tested and the collection chamber 111.

[0061] The on-off valve 21 refers to a component that can open or close the adapter 20, so that gas can flow or stop between the adapter 20 and the battery 200 to be tested. There are many options for the on-off valve 21, such as: the on-off valve 21 can be but not limited to a butterfly valve, a ball valve, a stop valve, etc. At the same time, there are also many ways to install the on-off valve 21, such as: the on-off valve 21 can be directly set on the adapter 20, such as: the valve core of the on-off valve 21 is directly installed inside the adapter 20; or, the on-off valve 21 is first installed on the battery 200 to be tested, and the adapter 20 is installed on the on-off valve 21, etc.

[0062] When the on-off valve 21 closes the adapter 20, the battery 200 to be tested cannot be connected to the collection chamber 111 through the adapter 20; when the on-off valve 21 opens the adapter 20, the battery 200 to be tested can be connected to the collection chamber 111 through the adapter 20, and the gas inside the battery 200 to be tested can flow into the collection chamber 111 for corresponding detection. The adapter 20 can be designed as a tubular structure, etc.

[0063] An on-off valve 21 is provided on the adapter 20 to facilitate the control of the opening and closing of the adapter 20, making the internal detection of the battery 200 to be tested more convenient.

[0064] According to some embodiments of the present application, optionally, the detection mechanism 10 further includes a connector 13 , which is connected to the collection body 11 and communicates with the collection chamber 111 , and is used to connect to a suction device (not shown).

[0065] The connector 13 is a component that allows the suction device to draw air into the collection chamber 111, and can be designed as a tubular structure. The connector 13 and the collection body 11 can be an integrated structure; or a combined structure, for example: the connector 13 and the collection body 11 can be connected by, but not limited to, bolts, welding, bonding, pinning, etc.

[0066] The suction device refers to a device that can provide suction force into the collection chamber 111, for example, the suction device can be but is not limited to a vacuum pump, etc. During the detection process, the suction device draws a vacuum into the collection chamber 111 through the connector 13, so that the original gas in the collection chamber 111 and the working device 12 is discharged.

[0067] The connector 13 is provided to facilitate vacuuming of the collection chamber 111, reduce the residual gas in the collection chamber 111 and the working device 12, reduce the impact on the internal gas detection of the battery 200 to be tested, and improve the reliability of the detection result.

[0068] According to some embodiments of the present application, optionally, please refer to Figure 3 The connector 13 has a suction port 131 for connecting with a suction device, and the suction port 131 is connected with the collection chamber 111 .

[0069] The suction port 131 refers to a structure on the connector 13 to which a suction device can be connected, and its shape can be designed in various ways. For example, the shape of the suction port 131 can be, but is not limited to, circular, square, pentagonal, elliptical, etc.

[0070] With such a design, the suction device is conveniently connected to the collection chamber 111 through the suction port 131 , so that the suction device can easily draw a vacuum into the collection chamber 111 .

[0071] According to some embodiments of the present application, optionally, please refer to Figure 3The opening area of ​​the suction port 131 is denoted as S1, where 0.196 cm 2 ≤S1≤3.14cm 2 .

[0072] The opening area of ​​the suction port 131 refers to the contour area formed by the suction port 131 on a plane perpendicular to the axis of the connector 13 at the end of the connector 13 away from the collecting body 11 .

[0073] If the opening area S1 is designed to be too small, it will not be conducive to quickly evacuating the collection chamber 111, affecting the vacuuming effect; if it is designed to be too large, the overall internal space of the battery testing device 100 will be increased, resulting in more gas remaining in the adapter 20 of the battery 200 to be tested during the testing process, thereby affecting the normal use of the battery 200 to be tested.

[0074] For this purpose, the opening area S1 can be 0.196 cm 2 ~3.14cm 2 For example, the opening area S1 can be but is not limited to 0.196 cm 2 、0.50cm 2 、1.00cm 2 、1.50cm 2 、2.00cm 2 、2.50cm 2 、3.00cm 2 、3.14cm 2 When the suction port 131 is circular in shape, the diameter of the suction port 131 may be 0.5 cm to 2 cm.

[0075] Reasonable design of the size of the suction port 131 can not only improve the vacuuming effect, but also reduce the loss of internal gas of the battery 200 to be tested during the testing process, thereby reducing the impact on the normal use of the battery 200 to be tested.

[0076] According to some embodiments of the present application, optionally, the opening area S1 also satisfies the following conditions: 0.502 cm 2 ≤S1≤0.785cm 2 .

[0077] The opening area S1 can be 0.502cm 2 ~0.785cm 2 For example, the opening area S1 can be but is not limited to 0.502 cm 2 、0.540cm 2 、0.560cm 2 、0.580cm 2 、0.6cm 2 、0.640cm2 、0.680cm 2 、0.785cm 2 When the suction port 131 is circular in shape, the diameter of the suction port 131 may be 0.8 cm to 1 cm.

[0078] The size of the suction port 131 is further optimized so that the battery testing device 100 can more effectively balance the vacuuming effect and the low loss of gas inside the battery 200 to be tested.

[0079] According to some embodiments of the present application, optionally, please refer to Figure 2 The working device 12 includes a first working component 121 , which is connected to the collecting body 11 and is used to collect the gas in the collecting chamber 111 .

[0080] The first working component 121 refers to a device that can collect the gas in the collection chamber 111, and has a space inside, which can be connected to the collection chamber 111. For example, when the first working component 121 is connected to the collection chamber 111, the gas in the component to be tested flows into the collection chamber 111 due to the internal and external differences, and then flows from the collection chamber 111 into the first working component 121. Of course, in other embodiments, the first working component 121 can be replaced by a device for online detection of gas components.

[0081] The first working assembly 121 is used to stably obtain the gas in the collection chamber 111, which facilitates the component analysis of the gas in the battery 200 to be tested, and is conducive to improving the convenience of the detection process.

[0082] According to some embodiments of the present application, optionally, please refer to Figure 4 The first working assembly 121 includes a collecting body 12a and a piston 12b disposed in the collecting body 12a. The collecting body 12a is connected to the collecting body 11, and the piston 12b is constructed to be able to slide along the axial direction X of the collecting body 12a.

[0083] The collecting body 12a refers to a vessel structure capable of collecting gas, and the piston 12b refers to a structure capable of sliding along the axis of the collecting body 12a. During the gas collection process, the gas can push the piston 12b to slide along the axis direction X under the action of the internal and external pressure difference, so that the gas is collected in the collecting body 12a.

[0084] In order to facilitate the pushing out of the collected gas, the first working assembly 121 further includes a push rod 12c, one end of which is inserted into the collecting body 12a and connected to the piston 12b. At the same time, in order to achieve quantitative collection of gas, the collecting body 12a can be designed as a translucent or transparent structure with scales, for example: the material of the collecting body 12a can be but not limited to inorganic glass, organic glass, etc. Of course, one end of the collecting body 12a can be designed as a conical structure, or a cylindrical structure, etc.

[0085] When the collecting body 11 is connected to a connector 13 for connecting to a suction device, the piston 12b can slide toward the end of the collecting body 12a close to the collecting chamber 111 under the action of the suction force to discharge the residual gas in the collecting body 12a and reduce the impact on the detection result.

[0086] The first working component 121 is designed to be a collecting body 12a and a piston 12b, so that the first working component 121 can collect gas more conveniently, which is beneficial to improving the detection efficiency.

[0087] According to some embodiments of the present application, optionally, please refer to Figure 2 The battery detection component also includes a first control valve 123, which is used to control the connection or disconnection between the first working component 121 and the collection chamber 111.

[0088] The first control valve 123 refers to a component that can control whether the gas can flow between the first working component 121 and the collection chamber 111, and it can be but is not limited to a butterfly valve, a ball valve, a gate valve, a stop valve, etc.

[0089] The first control valve 123 can be disposed on the collection body 11; it can also be disposed on the first working assembly 121, for example, the first control valve 123 is disposed on the collection body 12a of the first working assembly 121. During the detection process, when the adapter 20 is opened, the first control valve 123 can be slowly opened to allow the gas in the collection chamber 111 to flow into the first working assembly 121.

[0090] The first control valve 123 is provided to control the flow of gas between the first working component 121 and the collection chamber 111, so as to accurately control the amount of gas collected in the first working component 121, thereby reducing the loss of gas in the battery 200 to be tested while meeting the amount required for detection.

[0091] According to some embodiments of the present application, optionally, please refer to Figure 2 The working device 12 includes a second working component 122 , which is connected to the collecting body 11 and is used to detect the pressure value of the gas in the collecting chamber 111 .

[0092] The second working component 122 refers to a component capable of acquiring the air pressure in the collection chamber 111 , and may be, but is not limited to, an air pressure sensor or the like.

[0093] In this way, by providing the second working component 122 , the air pressure in the collection chamber 111 can be obtained timely and effectively, so as to obtain the air pressure in the battery 200 to be tested.

[0094] According to some embodiments of the present application, optionally, please refer to Figure 2The battery detection assembly further includes a second control valve 124. The second control valve 124 is used to control the connection or disconnection between the second working assembly 122 and the collection chamber 111.

[0095] The second control valve 124 refers to a component that can control whether the gas can flow between the second working component 122 and the collection chamber 111, and it can be but is not limited to a butterfly valve, a ball valve, a gate valve, a stop valve, etc.

[0096] The second control valve 124 can be disposed on the collection body 11 or on the second working assembly 122. During the detection process, when the adapter 20 is opened, the second control valve 124 can be slowly opened to allow the gas in the collection chamber 111 to flow into the second working assembly 122 and obtain the corresponding pressure value.

[0097] The second control valve 124 is provided to control the flow of gas between the second working assembly 122 and the collection chamber 111 , so as to facilitate controllable detection of the gas pressure inside the battery 200 to be tested.

[0098] According to some embodiments of the present application, optionally, please refer to Figure 3 The volume of the collection chamber 111 satisfies the following conditions: greater than or equal to 5 cm 3 And less than or equal to 30cm 3 .

[0099] The volume of the collection chamber 111 should be designed to be a certain value. For example, if the volume of the collection chamber 111 is designed to be too large, too much gas will remain in the collection chamber 111 during the detection process, affecting the normal use of the battery 200 to be tested; if the volume of the collection chamber 111 is designed to be too small, it will affect the installation of the working equipment 12 and increase the difficulty of assembly.

[0100] To this end, the volume of the collection chamber 111 can be controlled to 5 cm 3 ~30cm 3 For example, the volume of the collection chamber 111 may be, but is not limited to, 5 cm 3 、10cm 3 、15cm 3 , 20cm 3 、25cm 3 、30cm 3 It should be noted that when the collection chamber 111 is of a regular shape, the separation method can be used to calculate the volume of each; when the collection chamber 111 is of an irregular shape, the collection chamber 111 can be filled with liquid and the volume of the liquid can be calculated. Of course, the volume calculation of the collection chamber 111 is not limited to the above method.

[0101] The volume of the collection chamber 111 is controlled at 5 cm 3 ~30cm 3In the premise of ensuring convenient assembly, the residual amount in the gas detection process is reduced as much as possible, thereby reducing the impact on the normal use of the battery 200 to be tested.

[0102] According to some embodiments of the present application, optionally, the volume of the collection chamber 111 also satisfies the following conditions: greater than or equal to 10 cm 3 And less than or equal to 15cm 3 .

[0103] The volume of the collection chamber 111 can also be controlled within 10 cm 3 ~15cm 3 For example, the volume of the collection chamber 111 may be, but is not limited to, 10 cm 3 、11cm 3 、12cm 3 、13cm 3 、14cm 3 、15cm 3 wait.

[0104] The volume of the collection chamber 111 is further limited to 10 cm 3 ~15cm 3 In this way, the impact of the detection process on the battery 200 to be tested is further reduced.

[0105] According to some embodiments of the present application, optionally, please refer to Figure 3 The collecting body 11 is provided with a connecting port 115 communicating with the collecting chamber 111 , and the connecting port 115 is communicated with the adapter 20 .

[0106] During the testing process, the gas in the battery 200 to be tested can flow into the collection chamber 111 through the connection port 115. The shape of the connection port 115 can be designed in many ways, such as: circular, square, oval, pentagonal, etc. Figure 3 The opening area of ​​the connection port 115 is recorded as S2, and the opening area S2 can be controlled at 0.196 cm 2 ~3.14cm 2 In this way, the overall space size of the collection chamber 111 can be limited to a certain extent, reducing the residual amount of gas in the battery 200 to be tested. Of course, in other embodiments, the opening area S2 can also be controlled within 0.502 cm 2 ≤S2≤0.785cm 2 At this time, if the connection port 115 is a circular port, the diameter of the connection port 115 may be 0.8 cm to 1 cm.

[0107] With such a design, the gas in the battery 200 to be tested can flow into the collection chamber 111 through the connection port 115 , so as to complete the detection in the battery 200 to be tested.

[0108] According to some embodiments of the present application, optionally, a working device 12 is connected to one end of the collecting body 11 along a preset direction and away from the connecting port 115 , and the height of the collecting body 11 in the preset direction is denoted as h, where 5 cm≤h≤20 cm.

[0109] The smaller the height h of the collecting body 11 on the preset square is, the closer the working device 12 is to the battery 200 to be tested. This also means that the size of the collecting chamber 111 is also reduced, which can reduce the residual gas in the collecting chamber 111.

[0110] The height h may be any value between 5 cm and 20 cm. For example, the height h may be, but is not limited to, 5 cm, 7 cm, 9 cm, 10 cm, 12 cm, 14 cm, 16 cm, 18 cm, 20 cm, etc.

[0111] In some embodiments, the collecting body 12a may include a first component 112, a second component 113, and a connecting component 114 connected between the first component 112 and the second component 113. The first component 112, the connecting component 114, and the second component 113 define a collecting chamber 111. The first component 112 is connected to the adapter 20, and the working device 12 is arranged on the second component 113. At this time, the distance between a side of the first component 112 facing away from the connecting component 114 and a side of the second component 113 facing away from the connecting component 114 is a height h. At the same time, the first component 112, the connecting component 114, and the second component 113 may together form an I-shaped structure.

[0112] Controlling the height h within a range of 5 cm to 20 cm facilitates shortening the space size of the collection chamber 111 , reducing the residual gas in the collection chamber 111 , and reducing the impact of the detection process on the battery 200 to be tested.

[0113] According to some embodiments of the present application, optionally, please refer to Figure 3 , the height h also satisfies the condition: 6cm≤h≤10cm.

[0114] The height h may also be any value between 6 cm and 10 cm. For example, the height h may be, but is not limited to, 6 cm, 7 cm, 8 cm, 9 cm, 10 cm, etc.

[0115] Further controlling the height h within a range of 6 cm to 10 cm is beneficial to further reducing the residual gas in the collection chamber 111 .

[0116] According to some embodiments of this application, please refer to Figure 5 The present application provides a battery detection method, using any of the above battery detection devices 100, the battery detection method comprises the following steps:

[0117] S100, controlling the adapter 20 to open, so that the battery 200 to be tested is connected to the collection chamber 111 through the adapter 20;

[0118] S200 , using the working device 12 to collect and / or detect the gas in the collection chamber 111 .

[0119] In step S100, there are many ways to control the opening of the adapter 20, such as: opening the on-off valve 21 on the adapter 20, so that the inside of the battery 200 to be tested can be connected to the collection chamber 111 through the adapter 20; or, after removing the plug structure on the adapter 20, the collection body 11 is connected to the adapter 20, which can also achieve communication between the battery 200 to be tested and the collection chamber 111, etc.

[0120] In step S200, the working device 12 can collect the gas in the collection chamber 111, or directly detect the gas in the collection chamber 111. In the direct detection process, the working device 12 can obtain the pressure value of the gas in the collection chamber 111, or analyze the composition of the gas in the collection chamber.

[0121] In addition, in response to executing step S200 , the adapter 20 can be controlled to close, so that the battery 200 to be tested is disconnected from the collection chamber 111 , which allows the operator to remove the collection body 11 from the adapter 20 .

[0122] The above-mentioned battery detection method, using the above-mentioned battery detection device 100, can not only provide detection services for multiple batteries 200 to be tested, thereby improving the utilization rate of the device; but also monitor the performance of the same battery 200 to be tested in different stages, thereby realizing multiple effective detections within the life cycle of the battery 200 to be tested.

[0123] According to some embodiments of the present application, optionally, please refer to Figure 6 , the method also includes:

[0124] S300, controlling the adapter 20 to close, so as to disconnect the connection between the battery to be tested 200 and the collection chamber 111;

[0125] S400, controlling the working device 12 to communicate with the collection chamber 111;

[0126] S500, evacuate the collection chamber 111, and stop evacuating after a preset time.

[0127] In step S400, the working device 12 is controlled to be connected to the collection chamber 111, which can be achieved by opening the control valve in the working device 12, such as opening the first control valve 123 on the first working component 121, and opening the second control valve 124 on the second working component 122, wherein the working device 12 may include the first working component 121 and the second working component 122.

[0128] Before vacuuming, the working device 12 is connected to the collection chamber 111 , so as to discharge the original gas in the working device 12 by vacuuming, thereby reducing the influence of the residual gas in the working device 12 on the detection result of the battery 200 to be tested.

[0129] In step S500 , the preset time for vacuuming can be determined according to actual detection requirements, for example, the preset time can be but is not limited to 1 min to 5 min.

[0130] The collection chamber 111 is evacuated to reduce the residual gas in the collection chamber 111 and the working device 12, reduce the impact on the internal gas detection of the battery 200 to be tested, and improve the reliability of the detection result.

[0131] According to some embodiments of the present application, optionally, S200, the step of collecting and / or detecting the gas in the collection chamber 111 using the working device 12 includes: collecting the gas in the collection chamber 111 using the first working component 121 of the working device 12 to perform component analysis on the collected gas.

[0132] The first working assembly 121 refers to a device that can collect the gas in the collection chamber 111, and can include a collection body 12a and a piston 12b slidably disposed in the collection body 12a. In this way, when collecting gas, the gas in the collection chamber 111 can push the piston 12b into the collection body 12a. Of course, the first working assembly 121 can also include a push rod 12c, and the push rod 12c can be used to manually push and pull the piston 12b to speed up the collection and discharge of gas.

[0133] After step S500, the first working assembly 121 may be controlled to be disconnected from the collection chamber 111. At this time, when executing the steps of this embodiment, the first working assembly 121 may be slowly controlled to be connected to the collection chamber 111, such as slowly opening the first control valve 123 of the first working assembly 121.

[0134] With such a design, the gas in the collection chamber 111 can be stably obtained, which facilitates the component analysis of the gas in the battery 200 to be tested, and is beneficial to improving the convenience of the detection process.

[0135] According to some embodiments of the present application, optionally, S200, the step of collecting and / or detecting the gas in the collection chamber 111 using the working device 12 includes: obtaining the pressure value of the gas in the collection chamber 111 using the second working component 122 of the working device 12.

[0136] The second working component 122 refers to a component capable of acquiring the air pressure in the collection chamber 111 , and may be, but is not limited to, an air pressure sensor or the like.

[0137] Similarly, after step S500, the second working assembly 122 can be controlled to be disconnected from the collection chamber 111. At this time, when executing the steps of this embodiment, the second working assembly 122 can be slowly controlled to be connected to the collection chamber 111, such as slowly opening the second control valve 124 of the second working assembly 122.

[0138] With such a design, the air pressure in the collection chamber 111 can be obtained timely and effectively, so as to obtain the air pressure in the battery 200 to be tested.

[0139] According to some embodiments of the present application, the present application provides a battery detection system, which includes a battery 200 to be tested and any one of the battery detection devices 100 described above.

[0140] The battery 200 to be tested may also be referred to as a battery cell, which may include an end cap 210, a housing 240, a battery cell assembly, and other functional components. The specific structure may refer to Figure 1 The above description will not be repeated here.

[0141] The above-mentioned battery detection system, using the above-mentioned battery detection device 100, can not only provide detection services for multiple batteries 200 to be tested, thereby improving the utilization rate of the device; but also monitor the performance of the same battery 200 to be tested in different stages, thereby realizing multiple effective detections within the life cycle of the battery 200 to be tested.

[0142] According to some embodiments of the present application, optionally, please refer to Figure 7 The battery 200 to be tested is provided with an injection port 250 for injecting electrolyte, and the adapter 20 is connected to the injection port 250 .

[0143] The injection port 250 refers to a structure capable of injecting electrolyte into the battery 200 to be tested, and the adapter 20 can be fixed at the injection port 250 by threaded connection, welding, etc. In addition, considering the safety of the battery 200 to be tested, the explosion-proof structure of the battery 200 to be tested can be set at other parts of the end cover 210; or, the adapter 20 can be designed as a three-way structure, one end of which is connected to the injection port 250, one end is connected to the collection chamber 111, and the other end is provided with an explosion-proof structure, such as an explosion-proof membrane.

[0144] Directly disposing the adapter 20 at the liquid injection port 250 can save the need to drill a hole in the battery 200 to be tested, reduce damage to the structure of the battery 200 to be tested, and help improve the stability of the structure while ensuring effective testing of the battery 200 to be tested.

[0145] According to some embodiments of this application, please refer to Figures 2 to 7The present application provides a battery detection device 100, including a detection mechanism 10 and an adapter 20. The adapter 20 is arranged at the liquid injection port 250 of the battery 200 to be tested, and is provided with an on-off valve 21. The detection mechanism 10 includes a collecting body 11 with a collecting chamber 111, a connector 13 connected to the collecting body 11, and a working device 12. The working device 12 includes a first working component 121 capable of collecting gas, and a second working component 122 capable of detecting gas pressure, and the collecting body 11 is detachably connected to the adapter 20. With such a design, the air pressure and gas composition in the battery 200 to be tested under any aging state can be detected; at the same time, the device is easy to disassemble and can serve multiple batteries 200 to be tested.

[0146] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0147] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A battery detection device, characterized in that: The battery detection device comprises: The detection mechanism (10) comprises a collecting body (11) and a working device (12) connected to the collecting body (11), wherein the collecting body (11) has a collecting cavity (111); The adapter (20) is detachably connected to the collection body (11) and is in communication with the collection chamber (111); the adapter (20) is used to be openably and closably connected to the battery to be tested (200), and the working device (12) is used to collect and / or detect the gas in the collection chamber (111).

2. The battery detection device according to claim 1, characterized in that: The battery detection device further comprises an on-off valve (21), wherein the on-off valve (21) is used to open and close the adapter (20) so as to connect or disconnect the battery to be tested (200) from the collection chamber (111).

3. The battery detection device according to claim 1, characterized in that: The detection mechanism (10) further comprises a connecting head (13), wherein the connecting head (13) is connected to the collection body (11) and communicates with the collection chamber (111), and the connecting head (13) is used to be connected to a suction device.

4. The battery detection device according to claim 3, characterized in that: The connecting head (13) is provided with a suction port (131) for connection with the suction device, and the suction port (131) is connected with the collection chamber (111).

5. The battery detection device according to claim 4, characterized in that: The opening area of ​​the suction port (131) is denoted as S1, wherein 0.196 cm 2 ≤S1≤3.14cm 2 .

6. The battery detection device according to claim 5, characterized in that: The opening area S1 also meets the following conditions: 0.502 cm 2 ≤S1≤0.785cm 2 .

7. The battery detection device according to claim 1, characterized in that: The working device (12) comprises a first working component (121), wherein the first working component (121) is connected to the collecting body (11) and is used to collect the gas in the collecting chamber (111).

8. The battery detection assembly according to claim 7, characterized in that: The first working component (121) comprises a collecting body (12a) and a piston (12b) arranged in the collecting body (12a); the collecting body (12a) is connected to the collecting body (11); and the piston (12b) is constructed to be able to slide along the axial direction (X) of the collecting body (12a).

9. The battery detection assembly according to claim 7, characterized in that: The battery detection component further comprises a first control valve (123), wherein the first control valve (123) is used to control the connection or disconnection between the first working component (121) and the collection chamber (111).

10. The battery testing device according to claim 1, characterized in that: The working device (12) comprises a second working component (122), wherein the second working component (122) is connected to the collecting body (11) and is used to detect the pressure value of the gas in the collecting chamber (111).

11. The battery detection device according to claim 10, characterized in that: The battery detection component further comprises a second control valve (124), wherein the second control valve (124) is used to control the connection or disconnection between the second working component (122) and the collection chamber (111).

12. The battery detection device according to any one of claims 1 to 11, characterized in that: The volume of the collection chamber (111) satisfies the following conditions: greater than or equal to 5 cm 3 And less than or equal to 30cm 3 .

13. The battery testing device according to claim 12, characterized in that: The volume of the collection chamber (111) also satisfies the following conditions: greater than or equal to 10 cm 3 And less than or equal to 15cm 3 .

14. The battery detection device according to any one of claims 1 to 13, characterized in that: The collecting body (11) is provided with a connecting port (115) communicating with the collecting chamber (111), and the connecting port (115) is communicated with the adapter (20).

15. The battery testing device according to claim 14, characterized in that: The collecting body (11) is connected to the working device (12) at one end thereof along a preset direction and away from the connecting port (115), and the height of the collecting body (11) in the preset direction is denoted as h, wherein 5 cm ≤ h ≤ 20 cm.

16. The battery testing device according to claim 15, characterized in that: The height h also satisfies the condition: 6cm≤h≤10cm.

17. A battery detection method, characterized in that: Using the battery detection device according to any one of claims 1 to 16, the battery detection method comprises the following steps: Controlling the adapter (20) to open so that the battery to be tested (200) is connected to the collection chamber (111) through the adapter (20); The working device (12) is used to collect and / or detect the gas in the collection chamber (111).

18. The battery detection method according to claim 17, characterized in that: The method also includes: Controlling the adapter (20) to close so as to disconnect the connection between the battery to be tested (200) and the collection chamber (111); Controlling the working device (12) to communicate with the collection chamber (111); The collection chamber (111) is evacuated, and the evacuation is stopped after a preset time.

19. The battery detection method according to claim 17, characterized in that: The step of collecting and / or detecting the gas in the collection chamber (111) using the working device (12) comprises: The first working component (121) of the working device (12) is used to collect the gas in the collection chamber (111) so as to perform component analysis on the collected gas.

20. The battery detection method according to claim 17, characterized in that: The step of collecting and / or detecting the gas in the collection chamber (111) using the working device (12) comprises: The second working component (122) of the working device (12) is used to obtain the pressure value of the gas in the collection chamber (111).

21. A battery detection system, characterized in that: The battery detection system comprises a battery to be tested (200) and a battery detection device according to any one of claims 1 to 16.

22. The battery testing system according to claim 21, characterized in that: The battery to be tested (200) is provided with an injection port (250) for injecting electrolyte, and the adapter (20) is connected to the injection port (250).

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