Battery pole air tightness detection device, detection system and detection method

Abstract

The invention relates to the field of battery detection, in particular to a battery pole airtightness detection device, system and method. The battery pole air tightness detection device comprises a device main body and an extrusion piece, the device body comprises an inflation shell and a fixing part, the inflation shell is provided with an inflation cavity with an opening in one end, the battery pole is placed at the opening of the inflation shell and seals the opening, and the fixing part is arranged on an installation base plate of the battery pole in a pressed mode and fixedly connected with the inflation shell. The projection of the fixing piece in the direction perpendicular to the mounting substrate is arranged away from a pole main body of the battery pole; the extrusion part is positioned outside the inflatable shell, and is arranged opposite to the end surface of the pole main body in the axial direction of the battery pole. According to the air tightness detection device for the battery pole provided by the invention, the extrusion force can be applied to the end face of the pole main body through the extrusion piece, and the working condition that the battery pole is subjected to front extrusion is simulated, so that a corresponding detection system and a detection method are matched, and air tightness failure detection in the extrusion process of the battery pole is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery detection, and in particular to a battery pole post air tightness detection device, a detection system and a detection method. BACKGROUND

[0002] Lithium ion batteries are electrochemical energy storage devices that contain electrolytes and active materials inside. The pole post is one of the key components of the battery, which connects the positive and negative poles and also carries the conduction of electric current. Maintaining the air tightness of the battery pole post is of great significance for the normal use of lithium ion batteries. A battery pole post with good air tightness can ensure that the internal electrochemical reaction of the battery is not affected by external active gases, thereby providing more stable and efficient power output; if the battery pole post has air tightness problems, atmospheric gas components such as oxygen will react with the electrolyte inside the battery, causing corrosion and safety hazards.

[0003] Therefore, maintaining the air tightness of the battery pole post can prevent leakage and corrosion inside the battery and ensure the safe operation of the battery. It is necessary to detect the air tightness of the battery pole post to ensure its safety. With the proposal of the battery inversion scheme in the battery module, the mechanical abuse conditions such as bottom support during the driving of the electric vehicle can cause extrusion to the position of the battery pole post, which has the risk of air tightness failure. However, current battery pole post air tightness detection is mostly focused on regular use conditions, and there is a lack of systematic detection scheme for air tightness failure risk during the extrusion of the battery pole post. SUMMARY

[0004] To solve the above technical problems, the present application provides a battery pole post air tightness detection device, a detection system and a detection method.

[0005] The first aspect of the present application provides a battery pole post air tightness detection device for detecting the air tightness of a battery pole post, the battery pole post comprising a mounting base plate and a pole post body mounted on the mounting base plate, and the battery pole post air tightness detection device comprising a device body and an extrusion piece.

[0006] The device body comprises an inflation shell and a fixing piece, the inflation shell has an inflation cavity with one end open, the battery pole post is placed at the opening of the inflation shell and covers the opening, and the fixing piece is arranged on the mounting base plate and fixedly connected with the inflation shell, and the projection of the fixing piece along the direction perpendicular to the mounting base plate avoids the pole post body.

[0007] The extrusion piece is located outside the inflation shell, and the extrusion piece is arranged opposite to the end face of the pole post body in the axial direction of the battery pole post.

[0008] Optionally, the opening area of the inflatable shell is smaller than the axial projection area of the mounting substrate, and the mounting substrate is supported on the opening end surface of the inflatable shell and covers the opening.

[0009] Optionally, the fixing member is a pressing plate, and a relief through hole is formed in the pressing plate, the sectional area of the relief through hole is larger than the axial projection area of the pole body, and the pressing plate is arranged on the mounting substrate at the position around the relief through hole, and the pole body is exposed outside the device body through the relief through hole.

[0010] Optionally, the device body comprises a first sealing gasket and a second sealing gasket, the first sealing gasket is arranged between the opening end surface of the inflatable shell and the mounting substrate, and the second sealing gasket is arranged between the mounting substrate and the fixing member.

[0011] Optionally, the extrusion member comprises a connecting part and an extrusion part, the connecting part is connected with the loading testing machine, and the extrusion part is formed in a columnar structure extending along the axial direction of the battery pole.

[0012] The second aspect of the present application provides a battery pole air tightness detection system, comprising:

[0013] The battery pole air tightness detection device according to any one of the above-mentioned embodiments;

[0014] An inflation device connected with the inflatable shell;

[0015] A liquid container containing liquid and accommodating the device body and the battery pole;

[0016] A loading testing machine connected with the extrusion member and driving the extrusion member to move along the axial direction of the battery pole.

[0017] A shooting device, and the shooting angle of the shooting device covers at least part of the liquid container and the extrusion member.

[0018] Optionally, the inflation device comprises an inflation tank and an inflation pipeline, the inflation tank is connected with the inflatable shell through the inflation pipeline, and a gas valve and a gas pressure gauge are arranged on the inflation pipeline.

[0019] Optionally, the shooting device comprises a first camera and a second camera.

[0020] The shooting angle of the first camera covers at least part of the liquid container, and the surface of the extrusion member is provided with a speckle, and the shooting angle of the second camera covers the speckle.

[0021] Optionally, the battery pole air tightness detection system further comprises an illuminating device, and the illuminating area of the illuminating device covers at least part of the liquid container.

[0022] The third aspect of the present application provides a battery pole air tightness detection method, which adopts the battery pole air tightness detection system according to any one of the above embodiments, and comprises the following steps:

[0023] The battery pole is installed at the opening of the inflatable shell and covers the opening to form a sealed cavity, the sealed cavity is inflated, and then the device body and the battery pole are immersed in the liquid in the liquid container for air tightness inspection;

[0024] If the air tightness inspection is qualified, the loading testing machine is started, the extrusion member is driven to move along the axial direction of the battery pole at a preset speed, and the extrusion force is applied to the end surface of the pole body of the battery pole, at the same time, the loading testing machine records the force value in the loading process, the photographing device records the bubble generation on the surface of the battery pole and the displacement of the extrusion member, and the loading testing machine is stopped when the bubble is generated on the surface of the battery pole.

[0025] According to the force value recorded by the loading testing machine and the pictures taken by the photographing device, the force value-displacement data in the loading process is obtained, and the allowable intrusion amount of the battery pole is obtained.

[0026] Optionally, before the loading testing machine is started, the air tightness inspection on the battery pole specifically comprises:

[0027] The sealed cavity is inflated until the air pressure in the sealed cavity reaches a preset pressure value, the device body and the battery pole are immersed in the liquid in the liquid container for a preset time, the air pressure change in the sealed cavity during the immersion process is observed, if the air pressure in the sealed cavity is stable in the preset pressure range, and no bubble is generated in the liquid in the liquid container, it is determined that the air tightness inspection of the battery pole is qualified.

[0028] Compared with the prior art, the technical scheme provided by the embodiments of the present application has the following advantages:

[0029] The battery pole airtightness detection device provided by the application has the following advantages: the battery pole is fixed on the opening of the inflation shell by the fixing member, so that the battery pole and the inflation shell form a sealed cavity together, and the airtightness of the battery pole can be detected by inflating the sealed cavity with gas; the fixing member is arranged away from the pole body of the battery pole, the extrusion member is arranged outside the inflation shell, and the extrusion member is arranged opposite to the end surface of the pole body in the axial direction of the battery pole, so that the extrusion member can move in the axial direction of the battery pole and apply extrusion force to the end surface of the pole body, thereby simulating the working condition of the pole body of the battery pole being extruded from the front, and the airtightness failure of the battery pole during the extrusion process can be detected by matching the corresponding battery pole airtightness detection system and detection method. BRIEF DESCRIPTION OF DRAWINGS

[0030] The accompanying drawings, which are incorporated into and form a part of the specification, illustrate an embodiment consistent with the present application and, together with the description, serve to explain the principles of the application.

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows: obviously, for those skilled in the art, other drawings can also be obtained based on these drawings without creative labor.

[0032] Figure 1 A structural schematic diagram of the battery pole airtightness detection device according to an embodiment of the present application;

[0033] Figure 2 An exploded view of the device main body of the battery pole airtightness detection device and the battery pole according to an embodiment of the present application;

[0034] Figure 3 A sectional structural schematic diagram of the battery pole according to an embodiment of the present application;

[0035] Figure 4 A structural schematic diagram of the battery pole airtightness detection system according to an embodiment of the present application;

[0036] Figure 5 A flowchart of the battery pole airtightness detection method according to an embodiment of the present application;

[0037] Figure 6 A flowchart of the battery pole airtightness detection by using the battery pole airtightness detection system according to an embodiment of the present application.

[0038] Reference signs:

[0039] 1, device body; 11, inflatable shell; 111, opening; 112, connecting flange; 12, fixing member; 121, avoiding through hole; 13, first sealing gasket; 14, second sealing gasket;

[0040] 2, extrusion member; 21, connecting part; 22, extrusion part;

[0041] 3, battery pole; 31, mounting base plate; 32, pole body; 321, pole body; 322, pole riveting block; 33, sealing ring; 34, first plastic body; 35, second plastic body;

[0042] 4, inflation device; 41, inflation tank; 42, inflation pipeline; 43, gas valve; 44, air pressure gauge;

[0043] 5, liquid container; 51, liquid;

[0044] 6, shooting device; 61, first camera; 62, second camera;

[0045] 7, lighting device;

[0046] 8, test bench. DETAILED DESCRIPTION

[0047] In order to enable the above-mentioned objects, features and advantages of the present application to be more clearly understood, the following will further describe the solutions of the present application. It should be explained that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0048] In the following description, many specific details are set forth in order to fully understand the present application, but the present application can also be implemented in other manners different from those described herein; obviously, the embodiments in the description are only some embodiments of the present application, not all embodiments.

[0049] Some embodiments of the present application provide a battery pole air tightness detection device, which can be used for air tightness detection of a battery pole 3. Specifically, the battery pole 3 can include a mounting base plate 31 and a pole body 32 mounted on the mounting base plate 31, and the pole body 32 is arranged protruding from the mounting base plate 31.

[0050] Referring to Figure 1 and Figure 2 , some embodiments of the present application provide a battery pole air tightness detection device, which includes a device body 1 and an extrusion member 2.

[0051] The device body 1 includes an inflatable shell 11 and a fixing member 12. The inflatable shell 11 has an inflatable cavity with one open end. The battery terminal 3 is placed at the opening 111 of the inflatable shell 11 and the opening 111 is sealed. The fixing member 12 is pressed onto the mounting base plate 31 of the battery terminal 3 and is fixedly connected to the inflatable shell 11. The fixing member 12 is positioned so that its projection along a direction perpendicular to the mounting base plate 31 avoids the terminal body 32 of the battery terminal 3. That is, the fixing member 12 is pressed onto the mounting base plate 31, but it does not press down on the terminal body 32 set on the mounting base plate 31.

[0052] In a specific implementation, the battery terminal 3 to be tested can be placed at the opening 111 of the inflatable shell 11 and the opening 111 of the inflatable shell 11 can be sealed. The fixing member 12 is pressed onto the mounting base plate 31 of the battery terminal 3 and fixedly connected to the inflatable shell 11, thereby fixing the battery terminal 3 at the opening 111 of the inflatable shell 11, so that the battery terminal 3 and the inflatable shell 11 together form a sealed cavity. In this way, the airtightness of the battery terminal 3 can be tested by filling the sealed cavity with gas.

[0053] The extrusion member 2 is located outside the inflation shell 11, and is positioned axially opposite the end face of the terminal body 32 of the battery terminal 3. In a specific embodiment, the extrusion member 2 is configured to move axially along the battery terminal 3 and apply extrusion force to the end face of the terminal body 32. Alternatively, with reference to the inflation shell 11, the extrusion member 2 is positioned opposite the opening 111 of the inflation shell 11 and moves toward the opening 111 of the inflation shell 11 to apply extrusion force to the end face of the terminal body 32 of the battery terminal 3, which covers the opening 111 of the inflation shell 11. (Refer to...) Figure 1 As shown in the figure, arrow a in the figure represents the axial direction of the electrode post 3, that is, the direction perpendicular to the mounting substrate 31 of the battery post 3.

[0054] The battery terminal airtightness testing device provided in the above embodiments of the present invention has an inflation chamber with one open end in the inflation shell 11. The battery terminal 3 is placed at the opening 111 of the inflation shell 11 and the opening 111 of the inflation shell 11 is sealed. The fixing member 12 is pressed onto the mounting base plate 31 of the battery terminal 3 and fixedly connected to the inflation shell 11. This achieves the purpose of fixing the battery terminal 3 at the opening 111 of the inflation shell 11 using the fixing member 12, so that the battery terminal 3 and the inflation shell 11 together form a sealed cavity, so as to detect the airtightness of the battery terminal by filling the sealed cavity with gas. The airtightness of the battery terminal 3; the fixing member 12 is set away from the terminal body 32 of the battery terminal 3, the extrusion member 2 is located outside the inflation shell 11, and the extrusion member 2 is set directly opposite the end face of the terminal body 32 in the axial direction of the battery terminal 3, so that the extrusion member 2 can move along the axial direction of the battery terminal 3 and apply extrusion force to the end face of the terminal body 32, thereby simulating the working condition when the terminal body 32 of the battery terminal 3 is subjected to frontal extrusion, so as to facilitate the matching of a corresponding battery terminal airtightness detection system and detection method, and realize the detection of airtightness failure during the extrusion process of the battery terminal.

[0055] In some embodiments, refer to Figure 3 As shown, the battery terminal 3 includes a mounting base 31 and a terminal body 32 mounted on the mounting base 31. Specifically, the mounting base 31 may include a sheet of aluminum, or the mounting base 31 may be a sheet of aluminum. The terminal body 32 may include a terminal body 321 and a terminal riveting block 322. The sheet of aluminum has a terminal mounting hole, and the terminal riveting block 322 has a terminal riveting hole. The terminal body 321 partially passes through the terminal mounting hole, and the terminal riveting block 322 is sleeved on the terminal body 321 through the terminal riveting hole and riveted to the terminal body 321. In this way, the terminal body 32, composed of the terminal body 321 and the terminal riveting block 322, is fixed on the sheet of aluminum. Furthermore, the pole post riveting block 322 is sleeved on the pole post body 321. The end face of the pole post body 321 and the end face of the pole post riveting block 322 together form the end face of the entire pole post body 32. That is, the end face of the pole post body 321 exposed through the pole post riveting hole to the end face of the pole post riveting block 322 and the end face of the pole post riveting block 322 located on the periphery of the pole post body 321 together form the end face of the entire pole post body 32.

[0056] In the above embodiments, the extruder 2 applies extrusion force to the end face of the electrode body 32 along the axial direction of the battery electrode 3. That is, the extruder 2 applies extrusion force to the end face of the electrode body 321 and / or the end face of the electrode riveting block 322 along the axial direction of the battery electrode 3.

[0057] Furthermore, referring to Figure 3As shown, the battery terminal 3 also includes a first plastic body 34, a second plastic body 35, and a sealing ring 33. The mounting base plate 31 is mounted on the first plastic body 34, the terminal rivet block 322 is mounted on the second plastic body 35, and the sealing ring 33 is sleeved on the terminal body 321. The terminal body 321 partially passes through the first plastic body 34 and the mounting base plate 31. The terminal rivet block 322 and the second plastic body 35 are sleeved on the terminal body 321. The terminal rivet block 322 is riveted and fixed to the terminal body 321. The sealing ring 33 abuts and seals with the second plastic body 35 and the mounting base plate 31, thereby ensuring the sealing performance at the installation position of the terminal body 32.

[0058] In practical use, when mechanical abuse conditions such as bottoming out during electric vehicle operation cause compression at the battery terminal 3, the seal between the sealing ring 33 and the second plastic body 35 may fail, leading to a risk of airtightness failure of the battery terminal 3. The battery terminal airtightness detection device of this invention can simulate the condition of the battery terminal being subjected to frontal compression, facilitating the development of a corresponding battery terminal airtightness detection system and method to detect airtightness failure during the compression process.

[0059] Of course, the specific structure of the battery terminal is not limited to the above limitations. That is to say, the battery terminal air tightness detection device using the embodiments of the present invention is not limited to performing air tightness detection on battery terminals with the above structure, but can also perform air tightness detection on battery terminals with other structures. The above limitations on the battery terminal structure do not constitute a limitation on the scope of protection of the present invention.

[0060] When performing airtightness testing on battery terminals using the battery terminal airtightness testing device provided in this embodiment of the invention, the battery terminal 3 to be tested can be placed at the opening 111 of the inflatable shell 11 and the opening 111 of the inflatable shell 11 can be sealed. The fixing member 12 is pressed onto the mounting base plate 31 of the battery terminal 3 and fixedly connected to the inflatable shell 11, thereby fixing the battery terminal 3 at the opening 111 of the inflatable shell 11, so that the battery terminal 3 and the inflatable shell 11 together form a sealed cavity, and the fixing member 12 is offset from the terminal body 32 of the battery terminal 3. Then, gas is filled into the sealed cavity. Then, the device body 1 and the battery terminal 3 are immersed in the liquid 51. The squeezing member 2 applies a squeezing force to the end face of the terminal body 32 of the battery terminal 3 to simulate the working condition when the terminal body 32 of the battery terminal 3 is subjected to frontal squeezing. By observing whether bubbles are generated on the surface of the battery terminal 3, it can be determined whether the airtightness of the battery terminal 3 has failed when subjected to frontal squeezing.

[0061] In practice, the force sensor of the loading test machine can be used to record the force applied to the end face of the battery terminal 3's main body 32, and the shooting device 6 can be used to record the displacement of the extrusion piece 2 into the terminal body 32, thereby obtaining the permissible amount of intrusion of the battery terminal 3.

[0062] It should be noted that before applying pressure to the battery terminal 3, an initial airtightness check can be performed on the battery terminal 3 before applying pressure. Specifically, the device body 1 and the battery terminal 3, which are filled with gas, are immersed in the liquid 51. By observing whether bubbles are generated in the liquid 51, and also by observing whether the air pressure inside the device body 1 is stable, it can be determined whether the initial airtightness of the battery terminal 3 is qualified. When the initial airtightness of the battery terminal 3 is qualified, the front compression test is then performed.

[0063] Furthermore, it should be noted that since the battery terminal airtightness test in this embodiment of the invention is an airtightness failure test, actual manufactured battery terminals 3 can be randomly selected as terminal samples for testing. In specific implementations, the actual manufactured battery terminals 3 can be cut to form terminal samples that match the opening size of the inflatable shell 11.

[0064] In some embodiments, refer to Figure 2 As shown, the opening area of ​​the inflatable shell 11 is smaller than the axial projected area of ​​the mounting base 31. The mounting base 31 is supported on the opening end face of the inflatable shell 11 and seals the opening 111 of the inflatable shell 11. That is, the overall area of ​​the mounting base 31 of the battery terminal 3 is larger than the opening area of ​​the inflatable shell 11, so that the mounting base 31 can completely cover the opening 111 of the inflatable shell 11, so that when the battery terminal 3 is installed at the opening 111 of the inflatable shell 11, the battery terminal 3 and the inflatable shell 11 can form a sealed cavity together.

[0065] In some embodiments, refer to Figure 1 and Figure 2 As shown, the fixing member 12 is a pressure plate, which is pressed onto the mounting base plate 31 of the battery terminal 3 and fixedly connected to the inflatable shell 11. Specifically, the pressure plate has a clearance through hole 121, the cross-sectional area of ​​which is larger than the axial projection area of ​​the terminal body 32. The portion of the pressure plate around the clearance through hole 121 is pressed onto the mounting base plate 31, and the terminal body 32 is exposed to the outside of the device body 1 through the clearance through hole 121. That is to say, when the pressure plate is pressed onto the mounting base plate 31 of the battery terminal 3, it does not simultaneously press down on the terminal body 32 of the battery terminal 3. The terminal body 32 is exposed to the outside of the device body 1 through the clearance through hole 121, so that the pressing member 2 can apply a pressing force to the terminal body 32 of the battery terminal 3.

[0066] In some embodiments, refer to Figure 2As shown, the opening 111 of the inflatable shell 11 has a connecting flange 112 extending outward in the circumferential direction. The pressure plate is pressed onto the connecting flange 112 and is fixedly connected to the connecting flange 112 by fasteners. This arrangement allows the pressure plate to be detachably connected and fixed to the inflatable shell 11, facilitating the replacement of the battery terminals 3 and enabling the airtightness testing of different battery terminals 3.

[0067] Of course, in specific implementation, the fixing member 12 is not limited to a pressure plate. The fixing member may also include multiple pressure blocks, which are all pressed on the mounting base plate 31 of the battery terminal 3 and are set away from the terminal body 32 of the battery terminal 3.

[0068] In some embodiments, refer to Figure 2 As shown, the main body 1 of the device includes a first sealing gasket 13, which is disposed between the open end face of the inflatable shell 11 and the mounting base 31 to ensure the sealing between the open end face of the inflatable shell 11 and the mounting base 31. The main body 1 of the device also includes a second sealing gasket 14, which is disposed between the mounting base 31 and the fixing member 12 to ensure the sealing between the mounting base 31 and the fixing member 12.

[0069] In one specific embodiment, refer to Figure 2 As shown, the main body 1 of the device includes an inflatable shell 11 with one end open, and a first sealing gasket 13, a second sealing gasket 14 and a pressure plate arranged sequentially at the opening 111 of the inflatable shell 11. When it is necessary to test the airtightness of the battery terminal 3, the first sealing gasket 13, the battery terminal 3, the second sealing gasket 14 and the pressure plate are placed sequentially at the opening 111 of the inflatable shell 11. Fasteners are then passed through the pressure plate, the second sealing gasket 14, the first sealing gasket 13 and the inflatable shell 11 in sequence to fix the battery terminal 3 at the opening 111 of the inflatable shell 11 and ensure the airtightness between the battery terminal 3 and the inflatable shell 11.

[0070] In some embodiments, refer to Figure 1 As shown, the extrusion member 2 includes a connecting portion 21 and an extrusion portion 22. The connecting portion 21 is connected to a loading testing machine, and the extrusion portion 22 is formed as a columnar structure extending axially along the battery terminal 3. Alternatively, with reference to the inflation shell 11, the extrusion portion 22 is formed as a columnar structure extending toward the opening 111 of the inflation shell 11; furthermore, the end face of the extrusion portion 22 toward the opening 111 of the inflation shell 11 can be formed as a plane for applying extrusion force to the end face of the terminal body 32 of the battery terminal 3.

[0071] Of course, in specific implementation, the specific shape of the extrusion part 22 is not limited to the above limitation, and can also be set to other shapes as needed. The area and shape of the end face of the extrusion part 22 facing the opening 111 of the inflation shell 11 can be reasonably set according to the area and shape of the end face of the pole body 32.

[0072] Reference Figure 4 As shown, other embodiments of the present invention provide a battery terminal airtightness testing system, comprising:

[0073] Battery terminal airtightness testing device as described in any of the above embodiments;

[0074] The inflation device 4 is connected to the inflation shell 11 and is used to inflate the inflation shell 11 with gas.

[0075] The liquid container 5 contains liquid 51 (such as water or other liquids with a certain degree of transparency) and holds the main body of the device 1 and the battery terminal 3. In a specific implementation, the main body of the device 1 and the battery terminal 3 can be immersed in the liquid 51 to determine the airtightness of the battery terminal 3 by observing whether bubbles are generated in the liquid 51.

[0076] The loading test machine is connected to the extruder 2 and drives the extruder 2 to move along the axial direction of the battery terminal 3. In specific implementation, the extruder 2 can be driven to move along the axial direction of the battery terminal 3 by the loading test machine, so that the extruder 2 applies extrusion force to the end face of the terminal body 32 of the battery terminal 3. At the same time, the loading test machine can record the force value during the loading process.

[0077] The shooting device 6 has a shooting angle that covers at least part of the liquid container 5 and the extruder 2; in a specific implementation, the shooting device 6 is used to record the generation of air bubbles on the surface of the battery terminal 3 and the displacement of the extruder 2.

[0078] The battery terminal airtightness testing device includes a main body 1 and an extrusion member 2. The main body 1 includes an inflatable shell 11 and a fixing member 12. The inflatable shell 11 has an inflatable cavity with one open end. The battery terminal 3 is placed at the opening 111 of the inflatable shell 11 and the opening 111 is sealed. The fixing member 12 is pressed onto the mounting base plate 31 and fixedly connected to the inflatable shell 11, thereby fixing the battery terminal 3 at the opening 111 of the inflatable shell 11, so that the battery terminal 3 and the inflatable shell 11 together form a sealed cavity, and the fixing member 12 is set away from the terminal body 32. The extrusion member 2 is located outside the inflatable shell 11. The extrusion member 2 is set directly opposite the end face of the terminal body 32 in the axial direction of the battery terminal 3. The extrusion member 2 is connected to a loading test machine. The extrusion member 2 is configured to move along the axial direction of the battery terminal 3 under the drive of the loading test machine and apply extrusion force to the end face of the terminal body 32 to simulate the working condition when the terminal body 32 of the battery terminal 3 is subjected to frontal extrusion.

[0079] The battery terminal airtightness testing system provided in the above embodiments of the present invention involves placing the battery terminal 3 at the opening 111 of the inflatable shell 11 and sealing the opening 111. The battery terminal 3 is then fixed to the opening 111 using a fixing member 12, forming a sealed cavity with the inflatable shell 11. Gas is injected into the sealed cavity using an inflation device 4. The device body 1 and the battery terminal 3 are then immersed in the liquid 51 of the liquid container 5. A loading test machine drives the extrusion member 2 to press against the battery terminal 3. A compressive force is applied to the end face of the battery terminal body 32 to simulate the working condition of the battery terminal body 32 being subjected to frontal compression. The force value during the loading process is recorded by a loading test machine, and the generation of air bubbles on the surface of the battery terminal 3 and the displacement of the extruder 2 are recorded by a camera 6. The presence or absence of air bubbles in the liquid 51 is used to determine whether the airtightness of the battery terminal 3 has failed. Based on the force-displacement data during the loading process, the allowable intrusion amount of the battery terminal 3 is obtained, thus enabling the detection of airtightness failure during the compression of the battery terminal 3. Furthermore, before applying compressive force to the battery terminal 3, an initial airtightness check can be performed on the battery terminal 3 immersed in the liquid 51. If the initial airtightness check fails, there is no need to apply frontal compression force to the battery terminal 3.

[0080] It should be noted that the allowable intrusion amount of the battery terminal 3 is the displacement of the extruder 2 from the end face of the extruder 2 when it begins to contact the terminal body 32 until air bubbles are generated on the surface of the battery terminal 3.

[0081] For example, during the movement of the extruder 2 driven by the loading test machine, when the extruder 2 begins to contact the end face of the terminal body 32 and applies extrusion force to the end face of the terminal body 32, the force value of the loading test machine during the loading process will gradually increase, thereby obtaining the moment when the extruder 2 begins to contact the terminal body 32, i.e., the start moment; when the loading test machine continuously applies force to the battery terminal 3 through the extruder 2 until bubbles are generated in the liquid 51, it is the moment when the airtightness of the battery terminal fails, i.e., the failure moment. According to the image of the extruder 2 captured by the imaging device 6, the displacement data of the extruder 2 at different times can be obtained. Therefore, based on the start moment, end moment, and displacement data at different times obtained above, the displacement of the extruder 2 from the moment the extruder 2 begins to contact the end face of the terminal body 32 to the moment when bubbles are generated on the surface of the battery terminal 3 can be obtained. This displacement amount is the allowable intrusion amount of the battery terminal 3.

[0082] In specific implementation, refer to Figure 4 As shown, the battery terminal airtightness testing system may also include a test bench 8, a liquid container 5 which can be placed on the test bench 8, and an imaging device 6 and a lighting device 7 which can be set at appropriate positions on the test bench 8 to complete the airtightness test of the battery terminal 3 on the test bench 8.

[0083] In some embodiments, refer to Figure 4 As shown, the inflation device 4 includes an inflation tank 41 and an inflation pipeline 42. The inflation tank 41 is connected to the inflation shell 11 via the inflation pipeline 42. A gas valve 43 and a pressure gauge 44 are installed on the inflation pipeline 42. Specifically, the pressure gauge 44 can be installed on the pipeline near the gas valve 43 on the side of the inflation shell 11 to reflect the gas pressure value inside the inflation shell 11. Specifically, the inflation tank 41 can be a nitrogen tank, as nitrogen is an inert gas with good safety.

[0084] In some embodiments, refer to Figure 4 As shown, the imaging device 6 includes a first camera 61 and a second camera 62. The first camera 61 has a field of view that covers at least part of the liquid container 5 to record the generation of bubbles on the surface of the battery terminal 3. The surface of the extruder 2 is provided with speckle patterns, and the field of view of the second camera 62 covers the speckle patterns to record the displacement of the speckle patterns, thereby reflecting the displacement of the extruder 2. Specifically, the speckle patterns can be set at the position of the extruder 2 near the battery terminal 3 to facilitate better image capture of the speckle patterns by the second camera 62.

[0085] It should be noted that the speckle spraying technology combined with camera recording of speckle displacement is an effective non-contact measurement method, which is widely used in experimental mechanics to measure parameters such as displacement, strain, and vibration of objects. In this embodiment of the invention, speckle is sprayed on the surface of the extrusion part 2, and the second camera 62 is used to capture images of the speckle, thereby better knowing the displacement of the extrusion part 2.

[0086] In some embodiments, refer to Figure 4 As shown, the battery terminal airtightness testing system also includes an illumination device 7, the illumination area of ​​which at least partially covers the liquid container 5, in order to supplement the brightness of the liquid container 5 through the illumination device 7 to support the shooting of the imaging device 6.

[0087] Reference Figure 5 As shown, some embodiments of the present invention provide a method for detecting the airtightness of battery terminals, employing a battery terminal airtightness detection system as described in any of the above embodiments, including the following steps:

[0088] S101, install the battery terminal 3 at the opening 111 of the inflatable shell 11 and seal the opening 111 to form a sealed cavity, inflate the sealed cavity with air, and then immerse the device body 1 and the battery terminal 3 in the liquid 51 of the liquid container 5 for airtightness check.

[0089] Specifically, the airtightness check of the battery terminals includes: inflating the sealed cavity with air until the air pressure in the sealed cavity reaches the preset pressure value; immersing the main body 1 and the battery terminals 3 in the liquid 51 of the liquid container 5 for a preset time; observing the change in air pressure in the sealed cavity during the immersion process; if the air pressure in the sealed cavity is stable within the preset pressure range and no bubbles are generated in the liquid 51 of the liquid container 5, then the airtightness check of the battery terminals 3 is deemed to be qualified.

[0090] For example, the battery terminal 3 can be installed at the opening 111 of the inflatable shell 11 and the opening 111 of the inflatable shell 11 can be sealed. The fixing member 12 is pressed onto the mounting base plate 31 of the battery terminal 3 and fixedly connected to the inflatable shell 11, so that the battery terminal 3 and the inflatable shell 11 together form a sealed cavity. The sealed cavity is inflated to a preset pressure value (e.g., 0.3 MPa). The inflation valve is closed and the battery terminal 3 is immersed in liquid 51 (e.g., water) for a preset time (e.g., 15 min). The pressure change before and after 15 min is compared. If the pressure is stable at 0.3 MPa and no air bubbles are generated in the water, the initial air tightness check of the battery terminal 3 is deemed to be qualified. If the pressure decreases or air bubbles are generated in the water, the initial air tightness check of the battery terminal 3 is deemed to be unqualified, and there is no need to apply a frontal compression force to the battery terminal 3.

[0091] S102, if the airtightness test is qualified, start the loading test machine, drive the extruder 2 to move along the axial direction of the battery terminal 3 at a preset speed, and apply extrusion force to the end face of the terminal body 32 of the battery terminal 3. At the same time, the loading test machine records the force value during the loading process, and the imaging device 6 records the generation of bubbles on the surface of the battery terminal 3 and the displacement of the extruder 2 until bubbles are generated on the surface of the battery terminal 3. Stop the loading test machine when bubbles are generated on the surface of the battery terminal 3.

[0092] It should be noted that before applying extrusion pressure to the battery terminal 3, a camera device 6 needs to be set up. Specifically, a first camera 61 can be set up to record the generation of air bubbles on the surface of the battery terminal 3; speckle can be sprayed on the surface of the extrusion part 2, and a second camera 62 can be set up to record the displacement of the speckle, thereby obtaining the displacement of the extrusion part 2 through the displacement of the speckle.

[0093] Specifically, when applying compressive force to the battery terminal 3, the sealed cavity can be kept at a constant pressure (e.g., 0.3 MPa), the gas valve 43 can be kept closed, and the main body 1 of the device and the battery terminal 3 can be immersed in water (at least ensuring that the terminal body 32 of the battery terminal 3 is submerged in water); compressive force is applied to the end face of the terminal body 32 of the battery terminal 3 at a preset speed (e.g., low speed of 0.2 mm / min) until bubbles are generated near the battery terminal 3, at which point the loading test machine is stopped.

[0094] S103, based on the force value recorded by the loading test machine and the image captured by the imaging device 6, obtain the force-displacement data during the loading process, and thereby obtain the permissible intrusion amount of the battery terminal 3.

[0095] Specifically, the images captured by the second camera 62 can be processed using DIC (Digital Image Correlation, also known as digital image correlation technology, which is an easy-to-use optical method for measuring the deformation of an object's surface) to obtain the displacement of the extruder 2; based on the force-displacement data during the loading process, the permissible intrusion amount of the battery terminal 3 can be obtained; specifically, the permissible intrusion amount of the battery terminal 3 is the displacement of the extruder 2 from the moment the extruder 2 begins to contact the end face of the terminal body 32 until air bubbles are generated on the surface of the battery terminal 3.

[0096] After step S103, a simulation model can be constructed, and the force-displacement data during the loading process and the displacement at the moment of airtightness failure can be compared to complete the development of the airtightness simulation method.

[0097] The battery terminal airtightness detection method provided in the above embodiments of the present invention can simulate the working condition of the battery terminal 3 body 32 being subjected to frontal compression. The force value during the loading process is recorded by a loading test machine, and the bubble generation on the surface of the battery terminal 3 and the displacement of the extrusion member 2 are recorded by an imaging device 6. The airtightness of the battery terminal 3 is determined based on whether bubbles are generated in the liquid 51 during the loading process. Based on the force value recorded by the loading test machine and the image captured by the imaging device 6, the force-displacement data during the loading process is obtained, and the allowable intrusion amount of the battery terminal 3 is obtained accordingly, thereby realizing the detection of airtightness failure of the battery terminal 3 during the extrusion process.

[0098] In one specific embodiment of the present invention, reference is made to... Figure 6 As shown, the process of performing airtightness testing on battery terminal 3 using the battery terminal airtightness testing system provided in this embodiment of the invention mainly includes the following steps:

[0099] 1) Pre-test airtightness check: Install the battery terminal 3 at the opening 111 of the inflatable shell 11 and seal the opening 111 of the inflatable shell 11. Press the pressure plate onto the mounting base plate 31 of the battery terminal 3 and fix it to the inflatable shell 11 so that the battery terminal 3 and the inflatable shell 11 together form a sealed cavity. Inflate the sealed cavity to 0.3MPa, close the inflation valve, and immerse it in water for 15 minutes. Compare the air pressure change before and after 15 minutes to confirm that the air pressure is stable at 0.3MPa and no bubbles are generated in the water. Then start the test.

[0100] 2) Setting up the shooting device 6 before the test: the first camera 61 is set up to record the generation of air bubbles on the surface of the battery terminal 3; speckle is sprayed on the surface of the extrusion part 2, and the second camera 62 is set up to record the speckle displacement;

[0101] 3) Air tightness observation during the test: Maintain a constant pressure of 0.3MPa in the sealed cavity, keep the gas valve 43 closed, immerse the main body 1 of the device and the battery terminal 3 in water (at least ensure that the terminal body 32 of the battery terminal 3 is submerged in water); apply a compressive force to the end face of the terminal body 32 of the battery terminal 3 at a low speed of 0.2mm / min until bubbles are generated near the battery terminal 3, then stop loading the test machine;

[0102] 4) Post-test data processing: The force sensor of the loading test machine records the force value during the loading process. The images captured by the second camera 62 are processed using DIC to obtain the displacement of the extruded part 2. Based on the force-displacement data during the loading process, the allowable intrusion amount of the battery terminal 3 is obtained.

[0103] 5) Post-experiment simulation modeling: Conduct simulation model construction, benchmark the force-displacement data during the loading process and the displacement at the moment of airtightness failure, and complete the development of airtightness simulation method.

[0104] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the term "comprising" or any other variations thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0105] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery terminal airtightness testing device, used for testing the airtightness of battery terminals, wherein the battery terminal includes a mounting substrate and a terminal body mounted on the mounting substrate, characterized in that, Includes the main body of the device and the extrusion components; The main body of the device includes an inflatable shell and a fixing member. The inflatable shell has an inflatable cavity with one end open. The battery terminal is placed at the opening of the inflatable shell and the opening is sealed. The fixing member is pressed onto the mounting base plate and fixedly connected to the inflatable shell. The fixing member is positioned to avoid the terminal body along the projection perpendicular to the mounting base plate. The extrusion member is located outside the inflatable shell, and the extrusion member is disposed on the end face of the battery terminal body in the axial direction.

2. The battery terminal airtightness testing device according to claim 1, characterized in that, The opening area of ​​the inflatable shell is smaller than the axial projection area of ​​the mounting base plate, and the mounting base plate is supported on the opening end face of the inflatable shell and covers the opening.

3. The battery terminal airtightness testing device according to claim 2, characterized in that, The fixing component is a pressure plate, and the pressure plate has a clearance through hole. The cross-sectional area of ​​the clearance through hole is larger than the axial projection area of ​​the pole body. The part of the pressure plate located around the clearance through hole is pressed onto the mounting base plate. The pole body is exposed to the outside of the device body through the clearance through hole.

4. The battery terminal airtightness testing device according to claim 2, characterized in that, The main body of the device includes a first sealing gasket and a second sealing gasket. The first sealing gasket is disposed between the open end face of the inflatable shell and the mounting base plate, and the second sealing gasket is disposed between the mounting base plate and the fixing member.

5. The battery terminal airtightness testing device according to any one of claims 1 to 4, characterized in that, The extrusion member includes a connecting part and an extrusion part. The connecting part is connected to a loading test machine, and the extrusion part is formed as a columnar structure extending axially along the battery terminal post.

6. A battery terminal airtightness testing system, characterized in that, include: The battery terminal airtightness testing device as described in any one of claims 1 to 5; An inflation device is connected to the inflation shell; A liquid container, containing liquid, and holding the main body of the device and the battery terminals; A loading test machine is connected to the extrusion piece and drives the extrusion piece to move axially along the battery terminal post; The shooting device has a shooting angle that covers at least part of the liquid container and the extruder.

7. The battery terminal airtightness testing system according to claim 6, characterized in that, The inflation device includes an inflation tank and an inflation pipeline. The inflation tank is connected to the inflation shell through the inflation pipeline, and the inflation pipeline is equipped with a gas valve and a pressure gauge.

8. The battery terminal airtightness testing system according to claim 6, characterized in that, The shooting device includes a first camera and a second camera; The first camera's shooting angle covers at least a portion of the liquid container; the surface of the extruder is provided with speckle patterns, and the second camera's shooting angle covers the speckle patterns.

9. The battery terminal airtightness testing system according to claim 6, characterized in that, The battery terminal airtightness detection system also includes a lighting device, the lighting area of ​​which at least partially covers the liquid container.

10. A method for detecting the airtightness of battery terminals, characterized in that, The battery terminal airtightness testing system according to any one of claims 7 to 9 includes the following steps: Install the battery terminals at the opening of the inflatable shell and seal the opening to form a sealed cavity. Inflate the sealed cavity with air, and then immerse the main body of the device and the battery terminals in the liquid of the liquid container to check the airtightness. If the airtightness test is qualified, the loading test machine is started, and the extrusion piece is driven to move along the axial direction of the battery terminal at a preset speed, and extrusion force is applied to the end face of the battery terminal body. At the same time, the loading test machine records the force value during the loading process, and the imaging device records the generation of bubbles on the surface of the battery terminal and the displacement of the extrusion piece. The loading test machine is stopped when bubbles are generated on the surface of the battery terminal. Based on the force value recorded by the loading test machine and the image captured by the imaging device, force-displacement data during the loading process is obtained, and the permissible intrusion amount of the battery terminal is obtained accordingly.

11. The method for detecting the airtightness of battery terminals according to claim 10, characterized in that, Before starting the loading test machine, the airtightness check of the battery terminals specifically includes: Inflate the sealed cavity with air until the air pressure in the sealed cavity reaches the preset pressure value. Immerse the main body of the device and the battery terminal in the liquid in the liquid container for a preset time. Observe the change in air pressure in the sealed cavity during the immersion process. If the air pressure in the sealed cavity is stable within the preset pressure range and no bubbles are generated in the liquid in the liquid container, the airtightness of the battery terminal is deemed to be qualified.

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