Inert gas injection device for sealing detection of battery

Abstract

The utility model discloses an inert gas injection device for sealing detection of a battery, which comprises an isobaric cavity in which a battery clamp is arranged. A gas injection mechanism for injecting inert gas into the battery, a vacuumizing pipeline for vacuumizing the isobaric cavity and a positive pressure charging pipeline for providing positive pressure gas for the isobaric cavity are arranged on the isobaric cavity; an inert gas inlet channel of the gas injection mechanism is connected with an inert gas input pipeline and connected with a vacuumizing branch led out of the vacuumizing pipeline. The vacuumizing pipeline is respectively communicated with the interior and the exterior of the battery, and when inert gas is injected, the internal pressure and the external pressure of the battery are controlled and detected through the electric proportional valve and the pressure gauge, so that the consistency of the internal pressure and the external pressure of the battery and the consistency of the vacuum degree in the vacuumizing process can be effectively ensured, and electrolyte extraction in the vacuumizing process can be avoided; or the phenomenon that the battery is shrunken and deformed and the phenomenon that the battery is expanded and deformed are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of battery sealing detection devices, in particular to a battery sealing detection inert gas injection device. Background Art

[0002] As lithium-ion power batteries are increasingly used, the safety of lithium batteries is also receiving more and more attention. Battery sealing performance is directly related to battery safety and requires key supervision. Square power lithium batteries need to be tested for sealing after laser welding of sealing pins to ensure that the battery is well sealed and there is no risk of leakage. Therefore, the means of testing battery sealing performance is particularly important.

[0003] The sealing test is generally carried out through the helium concentration. Helium is injected into the battery in advance. After welding, the battery is placed in a vacuum environment, and the helium escape concentration is tested to determine the battery sealing performance. Among them, injecting helium into the battery is the key link. The existing technical means is to place the battery on a positioning fixture after the battery is filled with liquid, and press the helium injection nozzle at the injection port; first vacuum the battery to extract part of the air, and then inject helium to inject helium into the battery. During the helium injection process, the key control points are the vacuum degree of vacuuming, the vacuuming time, the helium injection pressure, and the helium injection time.

[0004] At present, the energy density of batteries produced by major manufacturers is increasing, so the amount of electrolyte inside the battery is relatively high. This also means that the space reserved for helium injection inside the battery is small. Vacuuming is likely to extract the electrolyte, resulting in low injection volume and poor injection volume. In addition, during helium injection, due to the vacuum degree, it is difficult to control the helium pressure and injection time of helium injection, which can easily cause deflation or expansion, causing battery deformation. For example, during helium injection, if the helium injection pressure and injection time are short, the middle of the battery will deflate; if the helium injection pressure and injection time are long, the battery will expand, which can easily cause battery deformation and affect the yield rate. Utility Model Content

[0005] The purpose of the utility model is to overcome the shortcomings and defects of the prior art and to provide a battery sealing detection and inert gas injection device, aiming to solve the problem that in the process of battery sealing detection by injecting inert gas under the prior art, the battery is easily deformed when the electrolyte is extracted and the gas is injected.

[0006] A battery sealing detection inert gas injection device comprises an isobaric cavity, in which a battery clamp is arranged, and on the isobaric cavity there are arranged a gas injection mechanism for injecting inert gas into the battery, a vacuum pipeline for evacuating the isobaric cavity, and a positive pressure charging pipeline for providing positive pressure gas to the isobaric cavity; the inert gas inlet channel of the gas injection mechanism is connected to an inert gas input pipeline, and is connected to a vacuum branch leading from the vacuum pipeline.

[0007] Wherein, the vacuum pipeline is provided with a first vacuum electrical proportional valve and a first vacuum gauge.

[0008] Wherein, the positive pressure charging pipeline is provided with a first positive pressure electrical proportional valve and a first pressure gauge.

[0009] Wherein, the vacuum branch is provided with a second vacuum electrical proportional valve and a second vacuum gauge.

[0010] Wherein, the inert gas input pipeline is provided with a second positive pressure electrical proportional valve and a second pressure gauge.

[0011] Wherein, a third positive-pressure electrical proportional valve is arranged on the inert gas input pipeline, and the third positive-pressure electrical proportional valve is arranged near the inert gas tank.

[0012] Wherein, the isobaric cavity comprises an upper cavity and a lower cavity, the upper cavity is detachably connected to the lower cavity, and a sealing ring is provided at the connection position between the upper cavity and the lower cavity.

[0013] Wherein, the battery clamp is arranged in the lower cavity, and the gas injection mechanism, vacuum extraction pipeline, and positive pressure charging pipeline are connected to the upper cavity and the connection position with the upper cavity is sealed.

[0014] Wherein, the gas injection mechanism comprises a suction nozzle, a sealant nail press head is arranged in the suction nozzle, the interior of the suction nozzle is an inert gas intake channel, and the inert gas intake channel is connected to the inert gas input pipeline through an opening on the side wall.

[0015] Wherein, a channel upper sealing block is arranged above the interior of the air intake channel and is located above the opening.

[0016] The utility model utilizes an isobaric cavity to control the process of injecting inert gas into the battery, so that during the process of injecting inert gas into the battery, the electrolyte will not be extracted when vacuuming, and the battery will basically not be deformed when injecting inert gas, which solves the technical problems described in the background technology to a certain extent.

[0017] The utility model discloses a vacuum pumping pipeline which is connected to the inside and outside of the battery respectively, and an electrical proportional valve and a vacuum gauge are provided to control and detect the vacuum degree inside and outside the battery. When an inert gas is injected, the electrical proportional valve and the pressure gauge are used to control and detect the pressure inside and outside the battery, which can effectively ensure that the pressure inside and outside the battery are consistent and the vacuum degree is consistent during the vacuum pumping process, and can avoid the phenomenon that the electrolyte is extracted during the vacuum pumping process, or the battery is deflated and deformed, and the battery is expanded and deformed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1This is a schematic diagram of the battery seal detection and inert gas injection device of the utility model.

[0019] Figure 2 It is a schematic diagram of the gas injection mechanism for injecting inert gas into the interior of a battery according to the present invention. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0021] like Figure 1 and Figure 2 As shown, a battery sealing detection inert gas injection device of an embodiment of the utility model comprises an isobaric cavity 11, in which a battery clamp 91 is arranged, and the isobaric cavity is provided with a gas injection mechanism 21 for injecting inert gas into the battery, a vacuum pumping line 31 for evacuating the interior of the isobaric cavity 11, and a positive pressure charging line 41 for providing positive pressure gas to the interior of the isobaric cavity; the inert gas inlet channel of the gas injection mechanism 21 is connected to the inert gas input line 52, and is connected to the vacuum pumping branch line 32 led out from the vacuum pumping line 31.

[0022] The vacuum pipeline is provided with a first vacuum electrical proportional valve 301 and a first vacuum gauge 303 , and is connected to a vacuum source 71 .

[0023] The cavity positive pressure charging pipeline is provided with a first positive pressure electrical proportional valve 401 and a first pressure gauge 402 , and is connected to a positive pressure source 61 .

[0024] The vacuum branch 32 is provided with a second vacuum electrical proportional valve 302 and a second vacuum gauge 304 .

[0025] The inert gas input pipeline 52 is provided with a second positive pressure electrical proportional valve 502 and a second pressure gauge 503 .

[0026] Therein, a third positive-pressure electrical proportional valve 501 is provided on the inert gas input pipeline 52 , and the third positive-pressure electrical proportional valve 501 is arranged near the inert gas tank 51 .

[0027] In some embodiments, the isobaric chamber 11 includes an upper chamber 101 and a lower chamber 102 , the upper chamber is detachably connected to the lower chamber, and a sealing ring is provided at the connection position between the upper chamber and the lower chamber.

[0028] In some embodiments, the battery fixture is arranged in the lower cavity, and the gas injection mechanism, vacuum extraction pipeline, and positive pressure charging pipeline are connected to the upper cavity and the connection position with the upper cavity is sealed.

[0029] In some embodiments, the gas injection mechanism 21 includes a suction nozzle 201, in which a sealant nail press head 204 is provided, and the interior of the suction nozzle is an inert gas inlet channel, and the inert gas inlet channel is connected to the inert gas input pipeline 52 through an opening on the side wall. Preferably, the inert gas injection pipe 207 connected through the opening on the side wall is connected to the inert gas input pipeline 52.

[0030] In some embodiments, a sealing block is arranged above the interior of the air inlet channel and is located above the opening to prevent the inert gas, such as helium, to be filled into the battery from escaping from above.

[0031] When in use, after the battery 81 is filled with liquid, the sealing nail 205 is pre-pressed at the filling port 202 of the battery shell (the sealing nail 205 is provided with a sealing nail flow channel 206, and the sealing nail flow channel 206 can connect the inside and outside of the battery after pre-pressing) and then prepares to inject inert gas, such as helium. At this time, the manipulator first grabs the battery and puts it into the lower cavity 102. After the battery is positioned by the battery clamp 91, the upper cavity 101 descends and closes with the lower cavity 102. The lower edge of the upper cavity 101 has a sealing ring 103 to ensure that the upper and lower cavities are well sealed after closing. After the isobaric cavity is closed, the battery clamp 91 clamps the battery 81 to ensure that the battery 81 is well positioned during the helium filling process.

[0032] The battery clamp 91 clamps the battery 81. After the battery 81 is positioned, the gas injection mechanism 21 descends, and the suction nozzle 201 presses on the surface of the battery cover 203 above the liquid injection port 202. After the contact is in place, the vacuum source 71 is turned on, the first vacuum electrical proportional valve 301 and the first vacuum electrical proportional valve 302 are opened, and the second positive pressure electrical proportional valve 502 is closed. The inside of the battery is evacuated through the vacuum pipeline 31, the vacuum branch 32, the inert gas pipe 207, and the sealing nail flow channel 206, and the inside of the isobaric cavity is evacuated through the vacuum pipeline 31; at the same time, the first vacuum gauge 303 and the second vacuum gauge 304 detect the vacuum degree of the inside of the battery and the cavity. By detecting the vacuum degree, adjust the opening and closing degree of the first vacuum electrical proportional valve 301 and the second vacuum electrical proportional valve 302 to ensure that the vacuum value inside the battery and the isobaric cavity is consistent. When the vacuum value inside the battery reaches the process setting value (-40±5Kpa), the second vacuum electrical proportional valve 302 and the first vacuum electrical proportional valve 301 are closed to stop vacuuming.

[0033] After the vacuuming is completed, the first positive pressure electrical proportional valve 501 and the second positive pressure electrical proportional valve 502 are opened, and the inert gas, such as helium, is injected into the battery through the inert gas tank 51, the inert gas input pipeline 52, the inert gas injection pipe 207, and the sealing glue nail flow channel 206. At the same time, the positive pressure source 61 is turned on, the first positive pressure electrical proportional valve 401 is opened, and the interior of the isobaric cavity is filled with inert gas, such as helium, through the positive pressure filling pipeline 41. The second pressure gauge 503 and the first pressure gauge 402 monitor the pressure changes inside the battery and the isobaric cavity respectively. By detecting the pressure, the opening and closing degree of the first positive pressure electrical proportional helium valve 501 and the second positive pressure electrical proportional valve 502 are adjusted to ensure that the positive pressure inside the battery and the isobaric cavity remains consistent. When the helium pressure inside the battery reaches the process setting value (-10±5Kpa), the first positive pressure electrical proportional valve 501 and the second positive pressure electrical proportional valve 502 are closed to stop filling with helium.

[0034] After the helium filling is completed, the sealant nail pressing head 204 is pressed down to press the sealant nail 205 to the specified position (at this time, the sealant nail flow channel 206 of the sealant nail 205 is closed to prevent the electrolyte inside the battery from leaking out). After the nail pressing is completed, the sealant nail pressing head 204 is retracted, the gas injection mechanism 21 rises, and the helium injection process is completed.

[0035] In the utility model, the key to the whole process of injecting inert gas is to control the pressure inside and outside the battery when evacuating and filling the battery with inert gas. Since the internal and external pipes of the battery are connected during evacuation and filling with inert gas, and the pressure is controlled by an electric proportional valve, the vacuum degree and pressure inside and outside the battery can be guaranteed to be the same. This avoids deformation problems such as deflation and expansion of the battery due to inconsistent pressure. Similarly, since the vacuum degree inside and outside the battery is consistent during the evacuation process, the electrolyte inside the battery will not be sucked out, eliminating the problem of extracting the electrolyte during the evacuation process.

[0036] From the above description, it can be seen that the utility model adopts a method of simultaneously evacuating the inside and outside of the battery to perform vacuuming, and controls the consistency of the vacuum degree during vacuuming, which can avoid the problem of extracting the electrolyte during vacuuming; the utility model adopts a method of simultaneously filling the inside and outside of the battery with inert gas (helium), controls the opening and closing of the electric proportional valve through pressure detection feedback, controls the pressure inside and outside the battery to be consistent, and can avoid the problem of battery deformation during helium injection.

[0037] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be implemented in other specific forms without departing from the spirit or basic features of the utility model.

[0038] Therefore, no matter from which point of view, the embodiments should be regarded as illustrative and non-restrictive, and the scope of the present invention is limited by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

[0039] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. Battery sealing detection inert gas injection device, characterized in that: The isobaric chamber comprises an isobaric chamber in which a battery fixture is arranged, and the isobaric chamber is provided with a gas injection mechanism for injecting an inert gas into the battery, a vacuum pipeline for evacuating the isobaric chamber, and a positive pressure charging pipeline for providing positive pressure gas to the isobaric chamber; the inert gas inlet channel of the gas injection mechanism is connected to an inert gas input pipeline, and is connected to a vacuum branch leading out of the vacuum pipeline.

2. The battery sealing detection and inert gas injection device according to claim 1, characterized in that: The vacuum pumping pipeline is provided with a first vacuum electrical proportional valve and a first vacuum gauge.

3. The battery sealing detection and inert gas injection device according to claim 1, characterized in that: The positive pressure charging pipeline is provided with a first positive pressure electrical proportional valve and a first pressure gauge.

4. The battery sealing detection and inert gas injection device according to claim 1, characterized in that: The vacuum branch line is provided with a second vacuum electrical proportional valve and a second vacuum gauge.

5. The battery sealing detection and inert gas injection device according to claim 1, characterized in that: The inert gas input pipeline is provided with a second positive pressure electrical proportional valve and a second pressure gauge.

6. The battery sealing detection and inert gas injection device according to claim 5, characterized in that: The inert gas input pipeline is provided with a third positive-pressure electrical proportional valve, and the third positive-pressure electrical proportional valve is arranged near the inert gas tank.

7. The battery sealing detection and inert gas injection device according to claim 1, characterized in that: The isobaric cavity comprises an upper cavity and a lower cavity, the upper cavity is detachably connected to the lower cavity, and a sealing ring is provided at the connection position between the upper cavity and the lower cavity.

8. The battery sealing detection and inert gas injection device according to claim 7, characterized in that: The battery fixture is arranged in the lower cavity, and the gas injection mechanism, the vacuum pumping pipeline, and the positive pressure charging pipeline are connected to the upper cavity and the connection position with the upper cavity is sealed.

9. The battery sealing detection and inert gas injection device according to claim 1, characterized in that: The gas injection mechanism comprises a suction nozzle, a sealant nail press head is arranged in the suction nozzle, the interior of the suction nozzle is an inert gas intake channel, and the inert gas intake channel is connected to the inert gas input pipeline through an opening on the side wall.

10. The battery sealing detection and inert gas injection device according to claim 9, characterized in that: A channel upper sealing block is arranged above the interior of the air intake channel and is located above the opening.

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