Lithium battery

Abstract

The application relates to the battery technical field and discloses a lithium battery which comprises a shell, a cover, a first plug and a second plug. The shell is provided with a containing cavity which is suitable for filling electrolyte, the end of the shell is provided with an inlet hole and an outlet hole which are communicated with the containing cavity. The end of the shell is provided with a first opening communicated with the containing cavity, the cover is connected with the end of the shell and seals the first opening. The first plug is detachably sealed in the inlet hole. The second plug is detachably sealed in the outlet hole. After the lithium battery is used for a long time, the first plug is detached from the inlet hole, the second plug is detached from the outlet hole, and then electrolyte is supplemented into the containing cavity through the inlet hole. After the containing cavity is filled with electrolyte, the first plug is detachably connected in the inlet hole, and the second plug is detachably connected in the outlet hole, so that the electrolyte is supplemented into the lithium battery, the lithium battery is reused, and the service life of the lithium battery is prolonged.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a lithium battery. Background Technology

[0002] Lithium-ion batteries are a type of battery that uses lithium metal or lithium alloys as positive / negative electrode materials and a non-aqueous electrolyte solution. They possess characteristics such as high energy density, long lifespan, no memory effect, and environmental friendliness, and are widely used in consumer electronics, electric vehicles, and energy storage systems. A lithium-ion battery consists of a casing, a cap, terminals, and an electrode assembly. The electrode assembly includes a positive electrode, a separator, and a negative electrode, which are stacked sequentially. The casing contains a cavity for housing the electrode assembly and the electrolyte. The cap is attached to the casing and seals the cavity. The terminals are mounted on the cap and connected to it, while the negative electrode is connected to the casing.

[0003] Existing lithium batteries have a cycle life of only 2000-3000 cycles. As the battery's usage time increases, metal deposition in the electrolyte and a decrease in conductivity occur, along with reduced electrolyte evaporation. However, the inability to refill the electrolyte in existing lithium batteries renders them non-reusable, thus resulting in a low battery life.

[0004] Therefore, how to solve or improve the problem of low lithium battery life caused by the inability to fill the electrolyte in the lithium battery has become an important technical problem to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, this application provides a lithium battery to solve or improve the problem of low lithium battery life caused by the inability of electrolyte to fill the lithium battery.

[0006] In a first aspect, this application provides a lithium battery, comprising:

[0007] The outer casing has a receiving cavity adapted to be filled with electrolyte. An inlet and an outlet are provided at the ends of the outer casing, and the inlet and the outlet are respectively connected to the receiving cavity.

[0008] The cover has a first opening at one end of the outer shell that communicates with the receiving cavity, and the cover is connected to the end of the outer shell and closes the first opening;

[0009] The first plug is detachably sealed inside the inlet hole;

[0010] The second plug is detachably sealed inside the outlet hole.

[0011] Optionally, it also includes:

[0012] The first flow tube is disposed within the receiving cavity and communicates with the inlet.

[0013] Optionally, a plurality of first flow holes are provided on the wall of the first flow tube, and each of the first flow holes is arranged sequentially along the extension direction of the first flow tube.

[0014] Optionally, it also includes:

[0015] The second flow tube is disposed within the receiving cavity and communicates with the inlet.

[0016] Optionally, a plurality of second flow holes are provided on the wall of the second flow tube, and each second flow hole is arranged sequentially along the extension direction of the second flow tube.

[0017] Optionally, it also includes:

[0018] The connecting tube has one end connected to the end of the first flow tube away from the inlet, and the other end connected to the end of the second flow tube away from the outlet.

[0019] Optionally, it also includes:

[0020] The pole is mounted on the cover;

[0021] A positive electrode plate is disposed within the receiving cavity and is electrically connected to the electrode post;

[0022] The negative electrode plate is disposed in the receiving cavity and is electrically connected to the outer shell;

[0023] A diaphragm is disposed within the receiving cavity and between the positive electrode and the negative electrode.

[0024] Optionally, the positive electrode, the separator, and the negative electrode are stacked sequentially to form an electrode group, and the electrode group is wound up, with the negative electrode located on the outer layer.

[0025] Optionally, the housing includes a main body and an extension connected to each other, and the receiving cavity includes a main cavity disposed in the main body and a secondary cavity disposed in the extension, wherein the main cavity and the secondary cavity are in communication;

[0026] The positive electrode, the negative electrode, and the separator are disposed in the main cavity, and the first flow tube and the second flow tube are disposed in the secondary cavity.

[0027] Optionally, the end of the main body is provided with the first opening, the first opening is in communication with the main cavity, and the cover is connected to the main body and closes the first opening;

[0028] The extension includes an extension housing and a cover plate. The end of the extension housing is provided with a second opening. The cover plate is connected to the end of the extension housing and closes the second opening. The inlet and outlet are formed through the cover plate.

[0029] This application provides a lithium battery, including a casing, a cap, a first plug, and a second plug. The casing has a receiving cavity suitable for filling with electrolyte. An inlet and an outlet are provided at the end of the casing, respectively communicating with the receiving cavity. A first opening communicating with the receiving cavity is provided at the end of the casing, and the cap is connected to the end of the casing and closes the first opening. The first plug is detachably sealed in the inlet. The second plug is detachably sealed in the outlet. After the lithium battery has been used for a long time and its performance has degraded, the first plug is removed from the inlet, and the second plug is removed from the outlet. Since the outlet can expel gas from the receiving cavity, electrolyte can be added to the receiving cavity through the inlet. After the receiving cavity is filled with electrolyte, the first plug is detachably reconnected to the inlet, and the second plug is detachably reconnected to the outlet, thereby replenishing electrolyte into the lithium battery, enabling the reuse of the lithium battery and increasing its service life. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this application, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the structure of a lithium battery according to an embodiment of this application;

[0032] Figure 2 This is a schematic diagram of the casing structure of a lithium battery according to an embodiment of this application;

[0033] Figure 3 This is an exploded view of a lithium battery cover, a first plug, a second plug, a first flow tube, a connecting tube, and a second flow tube according to an embodiment of this application.

[0034] Figure 4 This is a schematic diagram showing the connection between the cover plate, the first flow tube, the connecting tube, and the second flow tube of a lithium battery according to an embodiment of this application.

[0035] Figure 5 This is a schematic diagram showing the connection between the first flow tube, the connecting tube, and the second flow tube of a lithium battery according to an embodiment of this application.

[0036] Figure 6 This is a schematic diagram of the connection between the terminals and electrode assembly of a lithium battery according to an embodiment of this application.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1. Outer shell; 11. Main body; 111. Main cavity; 12. Extension section; 121. Extension shell; 1211. Secondary cavity; 122. Cover plate; 1221. Inlet hole; 1222. Outlet hole; 2. Cover; 3. First plug; 4. Second plug; 5. First flow tube; 51. First flow hole; 6. Second flow tube; 61. Second flow hole; 7. Connecting tube; 8. Electrode post; 9. Electrode assembly. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0040] The following is combined with Figures 1 to 6 This describes an embodiment of the present application.

[0041] According to embodiments of this application, in one aspect, a lithium battery is provided, such as... Figure 1 As shown, it includes a housing 1, a cap 2, a first plug 3, and a second plug 4. The housing 1 has a receiving cavity for accommodating the electrode assembly 9 and is suitable for filling with electrolyte.

[0042] An inlet hole 1221 and an outlet hole 1222 are provided at the end of the outer casing 1, such that the inlet hole 1221 communicates with the receiving cavity, and the outlet hole 1222 communicates with the receiving cavity. A first plug 3 is detachably connected to the inlet hole 1221 and blocks the inlet hole 1221. A second plug 4 is detachably connected to the outlet hole 1222 and blocks the outlet hole 1222.

[0043] A first opening is provided at the end of the outer casing 1, which communicates with the receiving cavity, allowing the electrode to be placed into the receiving cavity through the first opening. The cap 2 is connected to the end of the outer casing 1 and closes the first opening to ensure the sealing of the receiving cavity.

[0044] Specifically, in manufacturing this lithium battery, the outer casing 1 is placed vertically, with the inlet 1221 and outlet 1222 located at the top of the outer casing 1. After the electrode assembly 9 is placed into the receiving cavity through the first opening, the cap 2 is connected to the end of the outer casing 1 to close the first opening. Then, electrolyte is injected into the receiving cavity through the inlet 1221. Due to the presence of the outlet 1222, air in the receiving cavity can be discharged through the outlet 1222, thus allowing electrolyte to be directly injected into the receiving cavity. After the receiving cavity is filled with electrolyte, the first plug 3 is detachably connected to the inlet 1221, and the second plug 4 is detachably connected to the outlet 1222, thereby completely sealing the receiving cavity.

[0045] After prolonged use, the lithium battery can be placed vertically, with the inlet 1221 and outlet 1222 located at the top of the outer casing 1. The first plug 3 is removed from the inlet 1221, and the second plug 4 is removed from the outlet 1222. Electrolyte is then added to the cavity through the inlet 1221. After the cavity is filled with electrolyte, the first plug 3 is detachably reconnected to the inlet 1221, and the second plug 4 is detachably reconnected to the outlet 1222 to completely seal the cavity again. This allows for the replenishment of electrolyte into the lithium battery, enabling its reuse and extending its lifespan.

[0046] Furthermore, by observing the outlet 1222, it can be determined that the electrolyte fills the containment cavity when the electrolyte enters the outlet 1222.

[0047] The first plug 3 and the second plug 4 can be made of flexible materials, such as hot melt adhesive or silicone. When the first plug 3 is connected to the inlet hole 1221, the first plug 3 is tightly fitted to the inlet hole 1221. When the second plug 4 is connected to the outlet hole 1222, the second plug 4 is tightly fitted to the outlet hole 1222.

[0048] Specifically, when electrolyte needs to be replenished, the first plug 3 or the second plug 4 made of hot melt adhesive or silicone is removed. After replenishing the electrolyte, hot melt adhesive or silicone is used to reform the first plug 3 in the inlet hole 1221, and hot melt adhesive or silicone is used to reform the second plug 4 in the outlet hole 1222.

[0049] As an optional implementation method, such as Figures 3 to 5 As shown, the lithium battery also includes a first flow tube 5, which is disposed within the receiving cavity. The first flow tube 5 has a first end and a second end. The first end of the first flow tube 5 communicates with the inlet 1221, while the second end of the first flow tube 5 is disposed away from the inlet 1221. This allows the electrolyte entering through the inlet 1221 to enter from the first end of the first flow tube 5 and then flow out from the second end of the first flow tube 5.

[0050] With this configuration, when replenishing the electrolyte, the electrolyte is introduced through the inlet 1221, flows through the first flow tube 5, and then flows out from the second end of the first flow tube 5. This allows the electrolyte to first flow to a position away from the inlet 1221 before gradually filling the cavity. This prevents the electrolyte from overflowing from the inlet 1221 or outlet 1222 before the cavity is filled due to insufficient flow in the cavity. This not only avoids waste of electrolyte but also prevents the lifespan of the lithium battery from being affected by the electrolyte not filling the cavity.

[0051] The first flow tube 5 can be connected to the outer shell 1 and aligned with and connected to the inlet hole 1221; or it can be inserted into the inlet hole 1221 in a tight fit manner.

[0052] In optional embodiments, such as Figure 4 As shown, a plurality of first flow holes 51 are provided on the wall of the first flow tube 5. Each first flow hole 51 is arranged sequentially along the extension direction of the first flow tube 5, and each first flow hole 51 penetrates the wall of the first flow tube 5.

[0053] With this configuration, when replenishing the electrolyte, the electrolyte is introduced through the inlet 1221 and then flows into the first flow tube 5. As the electrolyte flows through the first flow tube 5, it not only flows out from the second end of the first flow tube 5 but also flows out from each of the first flow holes 51. This allows for the simultaneous replenishment of electrolyte to multiple locations, achieving uniform replenishment of electrolyte within the containment cavity.

[0054] In optional embodiments, such as Figures 3 to 5 As shown, the lithium battery also includes a second flow tube 6, which is disposed within the receiving cavity. The second flow tube 6 has a first end and a second end. The first end of the second flow tube 6 communicates with the outlet 1222, while the second end of the second flow tube 6 is disposed away from the outlet 1222. This allows fluid in the receiving cavity to enter from the second end of the second flow tube 6, flow through the second flow tube 6, and then flow from the first end of the second flow tube 6 to the outlet 1222.

[0055] With this configuration, when replenishing the electrolyte, it is introduced through the inlet 1221, flows through the first flow tube 5, and then exits from the second end of the first flow tube 5, replenishing the receiving cavity. Air in the receiving cavity enters from the second end of the second flow tube 6, flows through the second flow tube 6, and then exits from the first end of the second flow tube 6 to the outlet 1222, ensuring that the electrolyte can enter the receiving cavity.

[0056] In a further embodiment, such as Figure 5 As shown, a plurality of second flow holes 61 are provided on the wall of the second flow tube 6. Each second flow hole 61 is arranged sequentially along the extension direction of the second flow tube 6, and each second flow hole 61 penetrates the wall of the second flow tube 6.

[0057] In this way, when electrolyte is added to the cavity, air inside the cavity can enter the second flow tube 6 not only from the second end of the second flow tube 6, but also from each of the second flow holes 61. This allows the air inside the cavity to flow more smoothly into and out of the second flow tube 6. This prevents the electrolyte inflow rate from exceeding the air outflow rate, which could cause the electrolyte to overflow from the inlet hole 1221 or outlet hole 1222 before the cavity is completely filled. This not only avoids electrolyte waste but also prevents the lithium battery's lifespan from being affected by incomplete electrolyte filling of the cavity.

[0058] In optional embodiments, such as Figures 3 to 5As shown, the lithium battery also includes a connecting pipe 7. One end of the connecting pipe 7 is connected to the second end of the first flow pipe 5, that is, one end of the connecting pipe 7 is connected to the end of the first flow pipe 5 away from the inlet hole 1221. The other end of the connecting pipe 7 is connected to the second end of the second flow pipe 6, that is, the other end of the connecting pipe 7 is connected to the end of the second flow pipe 6 away from the outlet hole 1222. This allows the second end of the first flow pipe 5 to communicate with the second end of the second flow pipe 6 through the connecting pipe 7.

[0059] Thus, when replenishing the electrolyte, the electrolyte is introduced through the inlet 1221 and then flows into the first flow tube 5 from its first end. As the electrolyte flows through the first flow tube 5, it flows out from the first flow hole 51 on the first flow tube 5 into the receiving cavity. If the electrolyte flow rate is too fast, preventing all the electrolyte flowing through the first flow tube 5 from flowing out of the first flow hole 51, the remaining electrolyte flows to the second end of the first flow tube 5 and enters the second flow tube 6 through the connecting pipe 7, where it flows out from the second flow hole 61 on the second flow tube 6.

[0060] When the electrolyte fills the containment cavity, the second flow tube 6 is also filled with electrolyte. At this time, the electrolyte will overflow from the outlet 1222. By observing the outlet 1222, it can be determined that the containment cavity is full of electrolyte.

[0061] It is worth noting that, in order to prevent the electrolyte from overflowing from the outlet hole 1222 before the containment cavity is completely filled, the electrolyte should not be filled into the inlet hole 1221 too quickly. This is to prevent the electrolyte from being completely discharged into the containment cavity through the first flow hole 51 and the second flow hole 61, thereby preventing the electrolyte from flowing through the second flow tube 6 to the outlet hole 1222 before the containment cavity is completely filled.

[0062] Furthermore, the second flow hole 61 closest to the outlet 1222 should be located on the outer wall of the first end of the second flow tube 6 and communicate with the receiving cavity to ensure that before the electrolyte fills the receiving cavity, the gas in the receiving cavity can enter the second flow tube 6 through the second flow hole 61 and be discharged from the outlet 1222. This ensures that the electrolyte can fill the receiving cavity.

[0063] In optional embodiments, such as Figure 6 As shown, the lithium battery also includes a terminal post 8, a positive electrode, a negative electrode, and a separator. The terminal post 8 is inserted through the cover 2. The positive electrode is disposed in the receiving cavity and is electrically connected to the terminal post 8. The negative electrode is disposed in the receiving cavity and is electrically connected to the outer casing 1. The separator is disposed in the receiving cavity and is positioned between the positive and negative electrode.

[0064] When replenishing the electrolyte, the electrolyte is introduced through the inlet hole 1221 and then flows into the first flow tube 5. As the electrolyte flows through the first flow tube 5, it not only flows out from the second end of the first flow tube 5 but also flows out from each of the first flow holes 51. This allows for the simultaneous replenishment of electrolyte to multiple locations, enabling more uniform and rapid wetting of the positive and negative electrode plates.

[0065] The positive electrode is typically made of oxide materials (such as lithium cobalt oxide), which have high specific capacity and stability. The negative electrode is usually made of carbon-based materials such as graphite, used for the lithium-ion insertion / extraction process. A separator is located between the positive and negative electrodes to prevent short circuits and allow ion transport. The electrolyte is usually a mixture of organic solvents and salts. After the electrolyte is filled into the containment cavity, both the positive and negative electrodes are completely wetted by the electrolyte, enabling electrochemical reactions for energy storage and discharge.

[0066] Since the positive electrode is electrically connected to the terminal 8 and the negative electrode is electrically connected to the outer casing 1, the terminal 8 is the positive electrode of the lithium battery and the outer casing 1 is the negative electrode of the lithium battery during energy storage and discharge.

[0067] In a further embodiment, such as Figure 5 As shown, the positive electrode, separator and negative electrode are stacked in sequence to form electrode group 9. Since the wound electrode group 9 is placed in the receiving cavity, after the receiving cavity is filled with electrolyte, the positive electrode and negative electrode can be completely wetted by the electrolyte.

[0068] Because of the winding arrangement of the electrode assembly 9, the length of the positive and negative electrodes can be longer, thereby increasing the energy storage capacity of the lithium battery.

[0069] The negative electrode should be located on the outer layer of the separator. That is, when the electrode assembly 9 is wound, the positive electrode, separator, and negative electrode are arranged sequentially from the inside to the outside. Because the negative electrode is located on the outer layer, it is easier to connect the negative electrode to the outer casing.

[0070] In a further embodiment, such as Figure 1 and Figure 2 As shown, the outer casing 1 includes a main body 11 and an extension 12. The extension 12 is connected to the main body 11 and is located on one side of the main body 11. The receiving cavity includes a main cavity 111 and a secondary cavity 1211. The main cavity 111 is disposed within the main body 11, and the secondary cavity 1211 is disposed within the extension 12. The main cavity 111 and the secondary cavity 1211 are connected to form a single unit to form the receiving cavity.

[0071] The positive electrode, negative electrode and separator are disposed in the main cavity 111, and the first flow tube 5 and the second flow tube 6 are disposed in the secondary cavity 1211.

[0072] When electrolyte needs to be added, the first plug 3 is removed from the inlet 1221, and the second plug 4 is removed from the outlet 1222. Electrolyte is then introduced into the inlet 1221. As the electrolyte flows through the first flow tube 5, it flows out through the first flow hole 51 on the first flow tube 5 into the secondary cavity 1211 for replenishment, thereby replenishing the main cavity 111 with electrolyte. Air in the secondary cavity 1211 and the main cavity 111 can enter the second flow tube 6 through the second flow hole 61 and exit through the outlet 1222 to ensure that electrolyte can be added to the main cavity 111. After the cavity is filled with electrolyte, the first plug 3 is detachably reconnected to the inlet 1221, and the second plug 4 is detachably reconnected to the outlet 1222 to completely seal the cavity again, thus replenishing the lithium battery with electrolyte.

[0073] With this configuration, since the positive electrode, negative electrode, and separator are located in the main cavity 111, and the first flow tube 5 and the second flow tube 6 are located in the secondary cavity 1211, the first flow tube 5 and the second flow tube 6 will not interfere with the positive electrode, negative electrode, and separator in the main cavity 111. This avoids the first flow tube 5 and the second flow tube 6 affecting the storage and discharge capacity of the lithium battery.

[0074] Moreover, when filling the electrolyte, the electrolyte is first filled into the secondary cavity 1211, and then flows into the main cavity 111. This prevents the electrolyte from directly impacting the positive electrode, negative electrode and diaphragm in the main cavity 111, thus effectively avoiding damage to the positive electrode, negative electrode and diaphragm when filling the electrolyte.

[0075] In some embodiments, such as Figure 1 and Figure 2 As shown, the end of the main body 11 is provided with a first opening, which communicates with the main cavity 111. The cover 2 is connected to the end of the main body 11, so that the cover 2 closes the first opening.

[0076] The extension section 12 includes an extension housing 121 and a cover plate 122. A secondary cavity 1211 is disposed within the extension housing 121. A second opening is provided at the end of the extension housing 121, such that the second opening communicates with the secondary cavity 1211. The cover plate 122 is connected to the end of the extension housing 121, thereby closing the second opening. An inlet hole 1221 and an outlet hole 1222 are both formed through the cover plate 122, thereby communicating with the secondary cavity 1211.

[0077] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and such modifications and variations all fall within the scope defined by this application.

Claims

1. A lithium battery, characterized by, include: The outer shell (1) is provided with a receiving cavity, which is suitable for filling electrolyte. The end of the outer shell (1) is provided with an inlet hole (1221) and an outlet hole (1222), which are respectively connected to the receiving cavity. The cover (2) has a first opening at the end of the outer shell (1) that communicates with the receiving cavity. The cover (2) is connected to the end of the outer shell (1) and closes the first opening. The first plug (3) is detachably sealed inside the inlet hole (1221); The second plug (4) is detachably sealed inside the outlet (1222).

2. The lithium battery of claim 1, wherein, Also includes: The first flow tube (5) is disposed in the receiving cavity and communicates with the inlet (1221).

3. The lithium battery of claim 2, wherein, The first flow tube (5) has a plurality of first flow holes (51) on its tube wall, and each first flow hole (51) is arranged sequentially along the extension direction of the first flow tube (5).

4. The lithium battery according to claim 2, characterized in that, Also includes: The second flow tube (6) is disposed in the receiving cavity and communicates with the inlet (1221).

5. The lithium battery according to claim 4, characterized in that, The second flow tube (6) has a plurality of second flow holes (61) on its wall, and each second flow hole (61) is arranged sequentially along the extension direction of the second flow tube (6).

6. The lithium battery of claim 4, wherein, Also includes: The connecting pipe (7) is connected at one end to the end of the first flow pipe (5) away from the inlet (1221) and at the other end to the end of the second flow pipe (6) away from the outlet (1222).

7. The lithium battery according to claim 4, characterized in that, Also includes: The pole post (8) is disposed on the cover (2); A positive electrode plate is disposed in the receiving cavity and is electrically connected to the electrode post (8); The negative electrode is disposed in the receiving cavity and is electrically connected to the outer shell (1); A diaphragm is disposed within the receiving cavity and between the positive electrode and the negative electrode.

8. The lithium battery of claim 7, wherein, The positive electrode, the separator, and the negative electrode are stacked in sequence to form an electrode group (9), and the electrode group (9) is wound up, with the negative electrode located on the outer layer of the separator.

9. The lithium battery according to claim 7, characterized in that, The outer shell (1) includes a main body (11) and an extension (12) connected to each other. The receiving cavity includes a main cavity (111) disposed in the main body (11) and a secondary cavity (1211) disposed in the extension (12). The main cavity (111) and the secondary cavity (1211) are in communication. The positive electrode, the negative electrode, and the diaphragm are disposed in the main cavity (111), and the first flow tube (5) and the second flow tube (6) are disposed in the secondary cavity (1211).

10. The lithium battery according to claim 9, characterized in that, The end of the main body (11) is provided with the first opening, the first opening is connected to the main cavity (111), and the cover (2) is connected to the main body (11) and closes the first opening; The extension (12) includes an extension housing (121) and a cover plate (122). The end of the extension housing (121) is provided with a second opening. The cover plate (122) is connected to the end of the extension housing (121) and closes the second opening. The inlet hole (1221) and the outlet hole (1222) are formed through the cover plate (122).

Images