Battery cell explosion-proof valve pressing test tool and test method

Abstract

The invention discloses a battery cell explosion-proof valve pressing test tool and a test method, and relates to the technical field of battery cell explosion-proof valve tests.The test tool comprises a U-shaped frame used for being embedded into a battery cell body, the battery cell body is provided with an explosion-proof valve, a side plate is fixedly arranged at the opening end of the U-shaped frame, and a bottom plate and a top plate are fixedly arranged at the bottom and the top of the U-shaped frame respectively; the U-shaped frame, the bottom plate, the side plate and the top plate are enclosed to form a positioning tool for bearing a battery cell body, and a test hole is formed in the side surface of the U-shaped frame; the device further comprises a test bench, a U-shaped positioning frame used for limiting the positioning tool is fixedly arranged on the test bench, a test rod corresponding to the test hole in an inserted mode is arranged on one side of the U-shaped positioning frame, and the test rod is connected with a driving module used for driving the test rod to move linearly in the axial direction. According to the invention, not only can the phenomenon of air pollution be effectively avoided, but also the test gas can be repeatedly used, so that the cost is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery core explosion-proof valve testing, and in particular to a battery core explosion-proof valve pressure testing tool and a testing method. Background Art

[0002] New energy batteries are increasingly used in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are increasingly used in energy storage and other fields. Batteries are obtained by passing multiple processes through the battery core. The safety of the battery core is closely related to the explosion-proof valve. Therefore, when producing battery cores, the quality of the explosion-proof valve needs to be guaranteed.

[0003] The battery cell explosion-proof valve is a safety device used to prevent lithium battery explosions. It monitors the changes in internal pressure of the battery. When the pressure rises to a certain level, the valve opens to release the pressure, thereby preventing the battery from exploding. The principle of the battery cell explosion-proof valve test is mainly based on simulating abnormal internal pressure of the battery to verify the response capability and performance of the explosion-proof valve.

[0004] During the test, it is necessary to simulate the abnormal increase in internal pressure of the battery. This is usually achieved by injecting gas or liquid into the battery cell to increase the internal pressure of the battery cell.

[0005] In the prior art, the gas injected during the battery cell explosion-proof valve test is usually air or a stable inert gas. However, air and inert gas are not the same as the gas generated inside the battery cell. The gas generated inside the battery cell under abnormal conditions may include a mixed gas such as hydrogen, oxygen, and methane generated by the chemical reaction inside the battery. Therefore, the input of air or inert gas is difficult to accurately simulate the actual situation inside the battery cell.

[0006] However, in the actual testing process, if a mixed gas such as hydrogen, oxygen, and methane is used directly for testing, these gases will be discharged into the air, causing pollution and are difficult to recover. Summary of the invention

[0007] The purpose of the present invention is to provide a pressure test tool and test method for a battery cell explosion-proof valve to solve the following technical problems:

[0008] 1) The existing technology uses air or inert gas for pressure testing, which is difficult to accurately simulate the actual situation inside the battery cell; 2) If a mixed gas such as hydrogen, oxygen, and methane is directly used for testing, the discharge of these gases into the air will cause pollution.

[0009] The purpose of the present invention can be achieved through the following technical solutions:

[0010] A battery cell explosion-proof valve pressure test tool, comprising a U-shaped frame for embedding a battery cell body, an explosion-proof valve being arranged on the battery cell body, a side plate being fixedly arranged at the open end of the U-shaped frame, a bottom plate and a top plate being fixedly arranged at the bottom and top of the U-shaped frame respectively, the U-shaped frame and the bottom plate, the side plates and the top plate are enclosed to form a positioning tool for carrying the battery cell body, and a test hole is arranged on the side of the U-shaped frame;

[0011] It also includes a test bench, on which a U-shaped positioning frame for limiting the positioning tool is fixedly arranged, a test rod for plugging into the test hole is arranged on one side of the U-shaped positioning frame, the test rod is connected to a driving module that drives it to move linearly along the axial direction, and a conical end head for puncturing the battery body shell is fixedly arranged at the end of the test rod, an air groove is provided on the conical end head along its axial direction, and the air groove is connected to the air pressure regulating module;

[0012] The test bench is also provided with a gas collecting module, which is used to collect the gas discharged from the explosion-proof valve.

[0013] Preferably, the gas collection module comprises a sealing shell arranged on the test bench;

[0014] Wherein, the sealing shell is provided with an opening in the direction toward the test bench.

[0015] Preferably, the driving module comprises a rotating wheel fixedly connected to the test rod, the rotating wheel is arranged at one end of the test rod away from the conical end, and the other end of the rotating wheel is fixed to the push rod;

[0016] Wherein, a positioning frame is fixedly arranged on the test bench, and a screw fixed to the push rod is spirally arranged on the positioning frame, and the screw is connected to a rotating mechanism that drives the screw to rotate.

[0017] Preferably, the rotating mechanism comprises two sets of slewing bearings rotatably arranged on the push rod, the slewing bearings on both sides are fixed to the U-shaped frame, an L-shaped support plate is fixedly arranged on the U-shaped frame, a lifting cylinder is fixedly arranged on the L-shaped support plate, a gear is also fixedly arranged on the push rod, and a rack meshing with the gear is fixedly arranged on the driving end of the lifting cylinder;

[0018] Wherein, a guide rod is fixedly arranged on one side of the positioning frame, and a guide seat fixed to the L-shaped support plate is slidingly sleeved on the guide rod.

[0019] Preferably, the axial ends of the test rod, the rotating wheel, the push rod and the screw are all provided with an air supply channel connected to the air groove, and the air pressure regulating module includes an air pump fixedly arranged on the test bench, one end of the air pump is connected to the air storage cylinder fixedly arranged on the test bench, and the other end is connected to the air supply pipe, and the end of the air supply pipe is rotatably connected to the screw through a rotating bearing.

[0020] Preferably, an elastic sealing structure is arranged at the bottom opening end of the sealing shell;

[0021] Wherein, the sealing shell is connected to a compression module which drives the sealing shell to move in a vertical direction.

[0022] Preferably, the clamping module includes a first telescopic rod symmetrically fixed at both ends of the top of the sealing shell, the other end of the first telescopic rod is slidably plugged with the first sleeve, the first telescopic rod is provided with a first spring, the other end of the first sleeve is fixed to a horizontal guide plate, the horizontal guide plate is parallel to the test bench, the horizontal guide plate is fixed to an inclined guide plate on the side close to the test hole, the inclined guide plate is inclined toward the direction of the test bench, a mounting frame is fixed on the lifting cylinder, a clamping rod is vertically fixed on the side of the mounting frame close to the positioning tooling, and a clamping wheel is arranged by rotating the clamping rod toward one side of the test bench.

[0023] Preferably, a support frame is fixedly arranged on one side of the U-shaped positioning frame, and a second sleeve is vertically fixedly arranged on one end of the support frame away from the U-shaped positioning frame. A second telescopic rod is slidably inserted on the second sleeve, and the other end of the second telescopic rod is fixed to the support. A second spring is provided on the second telescopic rod, and the support is fixed to the sealing shell through the support rod.

[0024] Preferably, a lifting plate is slidably arranged in the sealing shell, the outer edge surface of the lifting plate is slidably fitted with the inner wall of the sealing shell, two groups of first electrode sheets are fixedly arranged on the lifting plate, and two groups of second electrode sheets are correspondingly fixedly arranged on a side wall of the sealing shell facing the lifting plate, and the first electrode sheets and the second electrode sheets are connected to the air pump through a controller;

[0025] Wherein, two groups of through holes are symmetrically provided on the top of the sealing shell, and lifting rods fixed to the lifting plate are slidably arranged in the through holes.

[0026] A testing method for a battery cell explosion-proof valve pressure test tool, characterized in that it comprises the following steps:

[0027] S1. The battery cell body is embedded in the positioning tooling, and the U-shaped frame is fixed to the bottom plate, side plate and top plate by several sets of bolts respectively;

[0028] S2. The positioning tool is embedded in the U-shaped positioning frame to limit the positioning tool. At the same time, the test hole on the U-shaped frame must correspond to the position of the test rod;

[0029] S3, the driving module drives the test rod to move in the direction of the positioning fixture, the test rod passes through the test hole and pierces the outer shell of the battery body through the conical end of the test rod, so that the conical end enters the interior of the battery body;

[0030] S4, the air pressure regulating module delivers the test gas to the air tank, so that the pressure in the battery cell increases until the explosion-proof valve releases pressure;

[0031] S5. After the gas is discharged through the explosion-proof valve, it is collected by the gas collecting module. The gas pressure regulating module extracts all the gas collected by the gas collecting module and the gas in the battery cell body for recycling.

[0032] Beneficial effects of the present invention:

[0033] (1) In the present invention, after the gas input into the battery body is discharged through the explosion-proof valve, it can be collected by the gas collection module to avoid the gas being discharged into the air and causing pollution. Then, the gas collected by the gas collection module and the gas in the battery body can be completely extracted through the air pressure regulating module for subsequent recycling. The present invention can not only effectively avoid the phenomenon of air pollution, but also reuse the test gas, saving costs;

[0034] (2) The present invention first drives the screw to rotate through a rotating mechanism. During the rotation process, the screw synchronously drives the push rod and the rotating wheel to move toward the positioning tooling. The push rod can push the conical end to move through the rotating wheel. In the present invention, the conical end can synchronously rotate during the process of puncturing the battery body shell, thereby improving the efficiency and stability of the puncture;

[0035] (3) In the present invention, after the battery cell body is embedded in the U-shaped positioning frame, the sealing shell is driven to move toward the positioning tooling through the clamping module. When the elastic sealing structure contacts the top plate, as the clamping module further presses the sealing shell, the sealing performance of the elastic sealing structure in contact with the top plate can be effectively improved, thereby effectively avoiding gas leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The present invention will be further described below in conjunction with the accompanying drawings.

[0037] Figure 1 It is a structural schematic diagram of a pressure test tooling for a battery core explosion-proof valve of the present invention;

[0038] Figure 2 It is a structural schematic diagram of an inclined guide plate in a pressure test tooling for a battery core explosion-proof valve of the present invention;

[0039] Figure 3 It is a structural schematic diagram of a lifting cylinder in a pressure test tooling for a battery core explosion-proof valve of the present invention;

[0040] Figure 4 It is a schematic diagram of the structure inside the sealing shell of a battery core explosion-proof valve pressure test tool of the present invention;

[0041] Figure 5 It is a structural schematic diagram of a positioning tool in a pressure test tool for a battery core explosion-proof valve of the present invention;

[0042] Figure 6It is a schematic diagram of the internal structure of a positioning tool in a pressure test tool for a battery core explosion-proof valve of the present invention;

[0043] Figure 7 It is a structural schematic diagram of a test rod in a pressure test tool for a battery core explosion-proof valve of the present invention;

[0044] Figure 8 It is a structural schematic diagram of a test rod cut in a pressure test tool for a battery core explosion-proof valve of the present invention;

[0045] Fig. 9 This is a schematic diagram of the structure of the battery body in a battery explosion-proof valve pressure test tooling of the present invention.

[0046] In the figure: 1, test bench; 2, positioning tool; 3, sealing shell; 4, air storage cylinder; 5, lifting cylinder; 6, support frame; 7, slewing bearing; 8, push rod; 101, positioning frame; 102, U-shaped positioning frame; 201, test hole; 202, positive pole; 203, explosion-proof valve; 204, negative pole; 205, sealing ring; 206, U-shaped frame; 207, side plate; 208, bottom plate; 209, top plate; 210, battery body; 301, elastic sealing structure; 302, lifting rod; 303, lifting plate; 304, first electrode sheet; 305, second electrode sheet; 401, air pump; 402, gas pipeline; 403, rotary Dynamic bearing; 501, mounting frame; 502, clamping rod; 503, clamping wheel; 504, inclined guide plate; 505, horizontal guide plate; 506, first sleeve; 507, first telescopic rod; 508, first spring; 509, through hole; 510, limit seat; 601, second sleeve; 602, second telescopic rod; 603, second spring; 604, support; 701, U-shaped frame; 702, L-shaped support plate; 703, rack; 704, gear; 705, guide rod; 706, guide seat; 707, screw; 801, rotating wheel; 802, test rod; 803, tapered end; 804, air groove; 805, air transmission channel. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] Example 1

[0049] See also Figure 5-Figure 6 as well as Figure 8-Figure 9As shown, the present invention is a battery cell explosion-proof valve pressure test tool, including a U-shaped frame 206 for embedding a battery cell body 210, a side plate 207 is fixedly arranged at the open end of the U-shaped frame 206, a bottom plate 208 and a top plate 209 are fixedly arranged at the bottom and top of the U-shaped frame 206, respectively, the U-shaped frame 206 and the bottom plate 208, the side plate 207 and the top plate 209 are enclosed to form a positioning tool 2 for carrying the battery cell body 210, wherein a test hole 201 is provided on the side of the U-shaped frame 206; specifically, a positive pole 202 and a negative pole 204 are respectively arranged on both sides of the battery cell body 210, and an explosion-proof valve 203 is arranged between the positive pole 202 and the negative pole 204;

[0050] It should be noted that, in this embodiment, before the pressure test is performed on the battery body 210, the battery body 210 is first embedded in the positioning tool 2, and the U-shaped frame 206 is fixed to the bottom plate 208, the side plate 207 and the top plate 209 by a number of groups of bolts, so that the battery body 210 can be load-limited. Since the battery body 210 is respectively fitted with the U-shaped frame 206, the bottom plate 208, the side plate 207 and the top plate 209 on all sides, during the pressure test, the gas can only be discharged through the explosion-proof valve 203, thereby avoiding the deformation of the shell of the battery body 210 itself, and the test stability is higher.

[0051] In addition, three groups of through holes corresponding to the positions of the positive pole 202, the negative pole 204 and the explosion-proof valve 203 are opened on the top plate 209, so that the gas can be discharged from the through holes.

[0052] See also Figure 1 , Figure 7-Figure 8 , further comprising a test bench 1, on which a U-shaped positioning frame 102 for limiting the positioning tool 2 is fixedly arranged, a test rod 802 for plugging into the test hole 201 is arranged on one side of the U-shaped positioning frame 102, the test rod 802 is connected to a driving module that drives it to move linearly along the axial direction, and a conical end 803 for puncturing the shell of the battery body 210 is also fixedly arranged at the end of the test rod 802, and an air groove 804 is provided on the conical end 803 along its axial direction, and the air groove 804 is connected to the air pressure regulating module;

[0053] In this embodiment, after the battery cell body 210 is installed on the positioning fixture 2, the positioning fixture 2 is embedded in the U-shaped positioning frame 102 to limit the positioning fixture 2. At the same time, the test hole 201 on the U-shaped frame 206 needs to correspond to the position of the test rod 802. Secondly, the test rod 802 is driven by the driving module to move toward the direction of the positioning fixture 2. The test rod 802 passes through the test hole 201 and pierces the outer shell of the battery cell body 210 through the conical end 803 at its end, so that the conical end 803 enters the interior of the battery cell body 210, and then the test gas is transported to the gas tank 804 through the air pressure regulating module. The test gas can be a mixed gas of hydrogen, oxygen, methane, etc., which is not limited to this, thereby increasing the pressure in the battery cell body 210 until the explosion-proof valve 203 is depressurized.

[0054] A gas collecting module is also arranged on the test bench 1, and the gas collecting module is used to collect the gas discharged from the explosion-proof valve 203; it can be explained that the gas input into the battery cell body 210 can be collected by the gas collecting module after being discharged through the explosion-proof valve 203 to avoid the gas being discharged into the air and causing pollution, and then the gas collected by the gas collecting module and the gas in the battery cell body 210 can be completely extracted through the air pressure regulating module to facilitate subsequent recycling and reuse. This embodiment can not only effectively avoid the phenomenon of air pollution, but also can reuse the test gas, saving costs.

[0055] Example 2

[0056] Based on Example 1, please refer to Figure 1-Figure 2 as well as Figure 4-Figure 5 The gas collecting module includes a sealing shell 3 arranged on the test bench 1, wherein the sealing shell 3 is provided with an opening in the direction of the test bench 1; it can be explained that after the positioning tool 2 is embedded in the U-shaped positioning frame 102, the sealing shell 3 is just covered on the through hole corresponding to the explosion-proof valve 203, so during the pressure test, the gas discharged from the explosion-proof valve 203 can enter the sealing shell 3 from the open end for collection to avoid gas leakage into the air.

[0057] In this example, see Figure 2-Figure 3The driving module includes a rotating wheel 801 fixedly connected to the test rod 802, the rotating wheel 801 is arranged at one end of the test rod 802 away from the conical end 803, and the other end of the rotating wheel 801 is fixed to the push rod 8, wherein a positioning frame 101 is fixedly arranged on the test bench 1, and a screw 707 fixed to the push rod 8 is spirally arranged on the positioning frame 101, and the screw 707 is connected to a rotating mechanism that drives it to rotate; it can be explained that during the test, this embodiment first drives the screw 707 to rotate through the rotating mechanism, and the screw 707 synchronously drives the push rod 8 and the rotating wheel 801 to move toward the direction of the positioning tooling 2 during the rotation process, and the push rod 8 can push the conical end 803 to move through the rotating wheel 801. In this embodiment, the conical end 803 can rotate synchronously during the process of puncturing the shell of the battery body 210, thereby improving the efficiency and stability of the puncture.

[0058] The rotating mechanism includes two groups of slewing bearings 7 rotatably arranged on the push rod 8, the slewing bearings 7 on both sides are fixed to the U-shaped frame 701, the U-shaped frame 701 is fixedly arranged with an L-shaped support plate 702, the L-shaped support plate 702 is fixedly arranged with a lifting cylinder 5, the push rod 8 is also fixedly arranged with a gear 704, and the driving end of the lifting cylinder 5 is fixedly arranged with a rack 703 meshing with the gear 704, wherein a guide rod 705 is fixedly arranged on one side of the positioning frame 101, and a guide seat 706 fixed to the L-shaped support plate 702 is slidably sleeved on the guide rod 705; It can be explained that when the driving screw 707 rotates, the rack 703 is driven to rise and fall through the lifting cylinder 5. The rack 703 can synchronously drive the gear 704 to rotate during the lifting process, and the gear 704 drives the push rod 8 to rotate. In this embodiment, the push rod 8 can synchronously drive the lifting cylinder 5 to move through the slewing bearing 7, the U-shaped frame 701 and the L-shaped support plate 702 during the horizontal transverse movement. During the movement, it can be guided and limited by the guide seat 706 and the guide rod 705 to improve its stability during movement.

[0059] As a further solution of this embodiment, please refer to Figure 1 , Figure 3 as well as Figure 7-Figure 8 , the test rod 802, the rotating wheel 801, the push rod 8 and the axial end of the screw 707 are all provided with a gas delivery channel 805 connected to the gas groove 804, and the air pressure regulating module includes an air pump 401 fixedly arranged on the test bench 1, one end of the air pump 401 is connected to the gas storage cylinder 4 fixedly arranged on the test bench 1, and the other end is connected to the gas delivery pipe 402, and the end of the gas delivery pipe 402 is rotatably connected to the screw 707 through a rotating bearing 403; it can be explained that in this embodiment, the gas to be tested is stored in the gas storage cylinder 4, and when testing, the air pump 401 is started, and the air pump 401 extracts the mixed gas in the gas storage cylinder 4 and delivers it to the gas delivery channel 805 through the gas delivery pipe 402, and finally can be output through the gas groove 804;

[0060] Correspondingly, when recovering gas, the gas can be reversely input into the gas storage cylinder 4 through the gas tank 804 and the gas transmission channel 805.

[0061] Also, see Figure 8 A sealing ring 205 is fixed on one side of the test hole 201 close to the battery body 210; it can be explained that as the test rod 802 is inserted into the test hole 201, the end of the test rod 802 can squeeze the sealing ring 205 to improve the sealing between the test rod 802 and the test hole 201 and the battery body 210 shell to avoid gas leakage.

[0062] In this embodiment, a telescopic hose is provided between the gas pipes 402 to prevent the screw rod 707 from interfering with the gas pipes 402 during translation.

[0063] See also Figure 1-Figure 2 as well as Figure 4 In order to improve the sealing between the bottom open end of the sealing shell 3 and the top plate 209 and prevent the gas from being discharged from the gap between the sealing shell 3 and the upper surface of the top plate 209, in this embodiment, an elastic sealing structure 301 is arranged at the bottom open end of the sealing shell 3, wherein the sealing shell 3 is connected to a pressing module that drives it to move in the vertical direction; it can be explained that when the battery body 210 is embedded in the U-shaped positioning frame 102, the sealing shell 3 is driven by the pressing module to move toward the positioning tool 2. When the elastic sealing structure 301 contacts the top plate 209, as the pressing module further presses the sealing shell 3, the sealing of the elastic sealing structure 301 in contact with the top plate 209 can be effectively improved, and gas leakage can be effectively avoided.

[0064] For details, please refer to Figure 1-Figure 2The clamping module includes a first telescopic rod 507 symmetrically fixedly arranged at the two ends of the top of the sealing shell 3, the other end of the first telescopic rod 507 is slidably plugged with the first sleeve 506, the first telescopic rod 507 is provided with a first spring 508, the other end of the first sleeve 506 is fixed to the horizontal guide plate 505, the horizontal guide plate 505 is parallel to the test bench 1, the horizontal guide plate 505 is fixed to the inclined guide plate 504 on the side close to the test hole 201, and the inclined guide plate 504 is inclined toward the direction of the test bench 1, and the lifting cylinder 5 is fixedly arranged with a mounting frame 501, and the mounting frame 501 is vertically fixedly arranged with a clamping rod 502 on one side of the positioning tool 2, and the clamping rod 502 is rotated toward one side of the test bench 1 to arrange a clamping wheel 503; it can be explained that when the test rod 802 has not been inserted into the test hole 201, the clamping wheel 503 is arranged. When the test rod 802 moves toward the test hole 201, the clamping wheel 503 and the inclined guide plate 504 are in a separated state. As the test rod 802 moves toward the test hole 201, the lifting cylinder 5 can synchronously drive the clamping wheel 503 to move through the mounting frame 501 and the clamping rod 502. The clamping wheel 503 first rolls and abuts against the inclined guide plate 504. As the clamping wheel 503 continues to move, the horizontal guide plate 505 can be pressed to move toward the test bench 1. The horizontal guide plate 505 then presses the first sleeve 506 and the first telescopic rod 507 to contract, so that the first spring 508 generates elastic force. The sealing shell 3 further improves the sealing between the elastic sealing structure 301 and the top plate 209 under the clamping action; correspondingly, when the test is completed, as the test rod 802 is reset, the sealing shell 3 can be synchronously driven to reset.

[0065] In order to position the vertical position of the sealing shell 3, in the present embodiment, a support frame 6 is fixedly arranged on one side of the U-shaped positioning frame 102, and a second sleeve 601 is vertically fixedly arranged on one end of the support frame 6 away from the U-shaped positioning frame 102, and a second telescopic rod 602 is slidably inserted on the second sleeve 601, and the other end of the second telescopic rod 602 is fixed to a support 604, and a second spring 603 is provided on the second telescopic rod 602, and the support 604 is fixed to the sealing shell 3 through the support rod; it can be explained that when it is not in the test state, based on the setting of the second spring 603, there is a certain distance between the sealing shell 3 and the top plate 209, and in the test state, as the sealing shell 3 moves downward, it can synchronously drive the support 604 to move downward through the support rod to compress the second spring 603, so as to facilitate the subsequent driving of the sealing shell 3 to reset to the initial height.

[0066] For further information, see Figure 4The lifting plate 303 is slidably arranged in the sealing shell 3, and the outer edge of the lifting plate 303 is slidably fitted with the inner wall of the sealing shell 3. Two sets of first electrode sheets 304 are fixedly arranged on the lifting plate 303, and two sets of second electrode sheets 305 are correspondingly fixedly arranged on one side wall of the sealing shell 3 facing the lifting plate 303. The first electrode sheet 304 and the second electrode sheet 305 are connected to the air pump 401 through the controller, wherein two sets of through holes 509 are symmetrically opened on the top of the sealing shell 3, and the through holes 509 are slidably arranged with electrodes fixed to the lifting plate 303. The lifting rod 302; it can be explained that, during the test, when the explosion-proof valve 203 is opened, the gas in the battery body 210 can be instantly filled into the sealed shell 3, and the lifting plate 303 can be pushed up under the action of air pressure until the first electrode sheet 304 is electrically connected to the second electrode sheet 305 and generates an electrical signal, and the controller can send a signal to the air pump 401 to stop supplying air, thereby achieving the effect of automatic control. When the air pressure in the sealed shell 3 returns to normal, the lifting plate 303 can be reset under the action of gravity.

[0067] It should also be noted that after the gas is recovered, air or inert gas may be filled into the cell body 210 and the sealed shell 3 through the air pump 401 to restore the gas pressure in the cell body 210 and the sealed shell 3 to normal.

[0068] Specifically, in order to limit the initial spacing between the lifting plate 303 and the top wall of the sealing shell 3, a limit seat 510 is fixedly arranged on the lifting rod 302 to limit the initial height of the lifting plate 303 in the sealing shell 3, so that a small amount of gas filled in the sealing shell 3 can push the first electrode sheet 304 and the second electrode sheet 305 to be electrically connected with higher accuracy.

[0069] A testing method for a battery cell explosion-proof valve pressure test tool comprises the following steps:

[0070] See also Figure 1 as well as Figure 5-Figure 9 , S1, embed the battery body 210 into the positioning tool 2, and fix the U-shaped frame 206 to the bottom plate 208, the side plate 207 and the top plate 209 respectively by several groups of bolts;

[0071] S2, embed the positioning tool 2 into the U-shaped positioning frame 102 to limit the positioning tool 2, and at the same time, the test hole 201 on the U-shaped frame 206 needs to correspond to the position of the test rod 802;

[0072] S3, the driving module drives the test rod 802 to move toward the positioning fixture 2, and the test rod 802 passes through the test hole 201 and pierces the outer shell of the battery body 210 through the conical end 803 at its end, so that the conical end 803 enters the interior of the battery body 210;

[0073] S4, the air pressure regulating module delivers the test gas to the air tank 804, so that the pressure in the battery cell body 210 increases until the explosion-proof valve 203 releases the pressure;

[0074] S5. After the gas is discharged through the explosion-proof valve 203, it is collected by the gas collecting module. The gas pressure regulating module extracts all the gas collected by the gas collecting module and the gas in the battery cell body 210 for recycling.

[0075] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, and a specific direction structure and operation, and therefore, cannot be understood as a limitation of the present invention. In addition, "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0076] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0077] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A battery cell explosion-proof valve pressure test tool, characterized in that: The invention comprises a U-shaped frame (206) for embedding a battery cell body (210), an explosion-proof valve (203) being arranged on the battery cell body (210), a side plate (207) being fixedly arranged at the open end of the U-shaped frame (206), a bottom plate (208) and a top plate (209) being fixedly arranged at the bottom and top of the U-shaped frame (206), respectively, the U-shaped frame (206) and the bottom plate (208), the side plates (207) and the top plate (209) are enclosed to form a positioning tool (2) for carrying the battery cell body (210), and a test hole (201) is provided on the side of the U-shaped frame (206); The test bench (1) further comprises a test bench (1), wherein a U-shaped positioning frame (102) for limiting the positioning tool (2) is fixedly arranged on the test bench (1), a test rod (802) for plugging into the corresponding test hole (201) is arranged on one side of the U-shaped positioning frame (102), the test rod (802) is connected to a driving module for driving it to move linearly along the axial direction, and a conical end head (803) for puncturing the shell of the battery cell body (210) is also fixedly arranged on the end of the test rod (802), an air groove (804) is provided on the conical end head (803) along its axial direction, and the air groove (804) is connected to the air pressure regulating module; A gas collection module is also arranged on the test bench (1), and the gas collection module is used to collect the gas discharged from the explosion-proof valve (203).

2. The battery core explosion-proof valve pressure test tool according to claim 1, characterized in that: The gas collection module comprises a sealing shell (3) arranged on the test bench (1); Wherein, the sealing shell (3) is provided with an opening in the direction facing the test bench (1).

3. The battery core explosion-proof valve pressure test tool according to claim 1, characterized in that: The driving module comprises a rotating wheel (801) fixedly connected to the test rod (802), the rotating wheel (801) being arranged at one end of the test rod (802) away from the conical end (803), and the other end of the rotating wheel (801) being fixed to the push rod (8); Wherein, a positioning frame (101) is fixedly arranged on the test bench (1), a screw rod (707) fixed to the push rod (8) is spirally arranged on the positioning frame (101), and the screw rod (707) is connected to a rotating mechanism that drives the screw rod to rotate.

4. The battery core explosion-proof valve pressure test tool according to claim 3, characterized in that: The rotating mechanism comprises two groups of slewing bearings (7) rotatably arranged on the push rod (8), the slewing bearings (7) on both sides are fixed to a U-shaped frame (701), an L-shaped support plate (702) is fixedly arranged on the U-shaped frame (701), a lifting cylinder (5) is fixedly arranged on the L-shaped support plate (702), a gear (704) is also fixedly arranged on the push rod (8), and a rack (703) meshing with the gear (704) is fixedly arranged on the driving end of the lifting cylinder (5); A guide rod (705) is fixedly arranged on one side of the positioning frame (101), and a guide seat (706) fixed to the L-shaped support plate (702) is slidably sleeved on the guide rod (705).

5. The battery core explosion-proof valve pressure test tool according to claim 2, characterized in that: The axial ends of the test rod (802), the rotating wheel (801), the push rod (8) and the screw (707) are all provided with an air delivery channel (805) connected to the air groove (804). The air pressure regulating module comprises an air pump (401) fixedly arranged on the test bench (1). One end of the air pump (401) is connected to an air storage cylinder (4) fixedly arranged on the test bench (1), and the other end is connected to an air delivery pipe (402). The end of the air delivery pipe (402) is rotatably connected to the screw (707) via a rotating bearing (403).

6. A battery core explosion-proof valve pressure test tool according to claim 5, characterized in that: An elastic sealing structure (301) is arranged at the bottom opening end of the sealing shell (3); Wherein, the sealing shell (3) is connected to a compression module which drives it to move in a vertical direction.

7. A battery core explosion-proof valve pressure test tool according to claim 6, characterized in that: The clamping module comprises a first telescopic rod (507) symmetrically fixedly arranged at two ends of the top of the sealing shell (3); the other end of the first telescopic rod (507) is slidably plugged with the first sleeve (506); the first telescopic rod (507) is provided with a first spring (508); the other end of the first sleeve (506) is fixed to a horizontal guide plate (505); the horizontal guide plate (505) is parallel to the test bench (1); the side of the horizontal guide plate (505) facing the test hole (201) is fixed to an inclined guide plate (504); the inclined guide plate (504) is inclined toward the test bench (1); a mounting frame (501) is fixedly arranged on the lifting cylinder (5); a clamping rod (502) is vertically fixedly arranged on the side of the mounting frame (501) facing the positioning tool (2); and a clamping wheel (503) is rotatably arranged on the clamping rod (502) facing one side of the test bench (1).

8. The battery core explosion-proof valve pressure test tool according to claim 7, characterized in that: A support frame (6) is fixedly arranged on one side of the U-shaped positioning frame (102); a second sleeve (601) is vertically fixedly arranged on one end of the support frame (6) away from the U-shaped positioning frame (102); a second telescopic rod (602) is slidably inserted on the second sleeve (601); the other end of the second telescopic rod (602) is fixed to a support (604); a second spring (603) is provided on the second telescopic rod (602); and the support (604) is fixed to the sealing shell (3) via the support rod.

9. The battery core explosion-proof valve pressure test tool according to claim 2, characterized in that: A lifting plate (303) is slidably arranged in the sealing shell (3), the outer edge surface of the lifting plate (303) is slidably fitted with the inner wall of the sealing shell (3), two groups of first electrode sheets (304) are fixedly arranged on the lifting plate (303), and two groups of second electrode sheets (305) are correspondingly fixedly arranged on a side wall of the sealing shell (3) facing the lifting plate (303), and the first electrode sheets (304) and the second electrode sheets (305) are connected to the air pump (401) via a controller; The top of the sealing shell (3) is symmetrically provided with two groups of through holes (509), and a lifting rod (302) fixed to the lifting plate (303) is slidably arranged in the through holes (509).

10. A testing method for the battery core explosion-proof valve pressure testing tool as claimed in claim 9, characterized in that: The steps include: S1, embedding the battery cell body (210) into the positioning tool (2), and fixing the U-shaped frame (206) to the bottom plate (208), the side plate (207) and the top plate (209) respectively by a plurality of sets of bolts; S2, embedding the positioning tool (2) into the U-shaped positioning frame (102) to limit the positioning tool (2), and at the same time, the test hole (201) on the U-shaped frame (206) needs to correspond to the position of the test rod (802); S3, the driving module drives the test rod (802) to move in the direction of the positioning tool (2), and the test rod (802) passes through the test hole (201) and pierces the outer shell of the battery cell body (210) through the conical end head (803) at its end, so that the conical end head (803) enters the interior of the battery cell body (210); S4, the air pressure regulating module delivers the test gas to the air tank (804), so that the pressure in the battery cell body (210) increases until the explosion-proof valve (203) releases the pressure; S5. After the gas is discharged through the explosion-proof valve (203), it is collected by the gas collection module. The gas pressure regulating module extracts all the gas collected by the gas collection module and the gas in the battery cell body (210) for recycling.

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