Mining maintenance-free battery pole sealing structure and sealing method adopting same

Abstract

The invention belongs to the technical field of power type lead-acid storage batteries, and particularly relates to a mining maintenance-free battery pole sealing structure and a sealing method adopting the same. Firstly, the pole body and the plastic sleeve are pre-connected to form the composite pole body, then the composite pole body is sleeved with the O-shaped sealing ring, the composite pole body is pressed into the pole hole of the battery cover, the O-shaped sealing ring is located between the plastic sleeve and the pole hole, and sealing connection is formed through interference fit. And the composite pole body and the sealing sleeve are sealed in a double-sealing manner of combining compression of the sealing gasket and glue pouring, so that the sealing reliability is greatly improved, and the possibility that acid liquor climbs out along the pole is effectively reduced. The exterior of the composite pole body is sealed by multiple sealing rings, when the pole body deflects, the O-shaped sealing ring at the bottom of one side is extruded, the O-shaped sealing ring at the bottom of the opposite side is loosened, but the O-shaped sealing ring at the top of the opposite side is inevitably in an extruded sealing state, so that the defect of poor sealing caused by deflection of the pole body is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of power lead-acid batteries, and in particular relates to a maintenance-free battery pole sealing structure for mining and a sealing method using the same. Background Art

[0002] Maintenance-free power batteries for mining usually adopt a valve-controlled sealing structure. Due to the recycling of oxygen inside the battery and the high internal pressure, high requirements are placed on the sealing of the battery poles. Leakage and acid creep are not allowed during the service life to prevent early battery failure due to electrolyte loss, or battery leakage due to pole acid creep, resulting in leakage or corrosion of related electrical equipment, affecting the normal use of users and even causing dangerous accidents such as personal injury.

[0003] At present, the valve-controlled sealed battery pole usually uses a spiral ring to compress and seal the sealing ring, and then glue is added on the top to prevent the spiral ring from loosening and shifting. Patent CN101853927A discloses a valve-controlled sealed lead-acid battery sealing structure: there is a rubber sealing ring at the bottom of the battery cover terminal slot, and a pressure pad nut connected to the battery cover threaded on the upper part of the sealing ring, and the upper part of the pressure pad nut is a sealant. However, there are many defects in the structure during actual operation, which causes the pole to climb acid. First, due to the small size of the sealing ring, it is easy to cause deformation or not to be stuck to the bottom during installation, and then the sealing ring will be damaged when screwing into the spiral ring, resulting in the risk of acid leakage. Secondly, there is a skewed situation when the pole is assembled. When it cooperates with the sealing ring, one side is loose and the other side is tight. Since it is only a linear seal, the contact surface is not enough, resulting in the risk of acid leakage on the side that is loose in contact with the pole. In addition, due to the complex structure and large volume of the spiral ring, insufficient glue is added or insufficient contact surface, which is easy to cause the spiral ring to loosen, thereby compressing the sealing ring in place, resulting in the risk of acid leakage.

[0004] Patent CN115275467A discloses a battery pole sealing structure. On the basis of the above patent, grooves are provided on the outer ring surface of the pole body. The electrolyte flows out of the shell along the outer ring surface of the pole through the grooves. The setting of multi-stage ring grooves increases the electrolyte crawling path and reduces the risk of battery leakage. In fact, this design only delays the process of leakage and cannot solve the problem of leakage. More importantly, due to the process requirements, it must be a smooth and flat surface, and this patent has designed multiple grooves, which makes the sealant and the pole body fit worse, and gaps are prone to appear, which makes it easier to crawl acid. At the same time, this patent uses heat shrink tubing to fit the pole body. The heat shrink tubing has no compression rate and does not play a sealing role at all.

[0005] The above sealing structure has defects such as high process requirements, complex procedures, low efficiency, etc. during battery assembly, as well as complex component structure and high cost. Therefore, the existing sealing technology is difficult to meet the quality requirements of current products. Summary of the invention

[0006] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a maintenance-free battery pole sealing structure for mining, which effectively improves the pole sealing performance.

[0007] The present invention also provides a sealing method using the same, which is convenient and reliable to install, reduces labor consumption, and reduces manufacturing costs. First, the pole body is pre-connected with the plastic sleeve to form a composite pole body, and then an O-type sealing ring is put on the outside of the composite pole body, and then the composite pole body is pressed into the pole hole of the battery cover, and the O-type sealing ring is located between the plastic sleeve and the pole hole, and a sealed connection is formed by interference fit, so that liquid leakage and acid creep will not occur.

[0008] The maintenance-free battery pole sealing structure for mining of the present invention comprises a battery cover, a pole hole is provided on the battery cover, and a composite pole body, the top of the composite pole body passes through the pole hole on the battery cover, and a plurality of O-type sealing rings are arranged in parallel between the composite pole body and the pole hole, and a sealed connection is formed by interference fit; The composite pole body comprises a pole body, a plastic sleeve, a sealing rubber layer and a sealing gasket. A positioning step is provided at the bottom of the pole body, and the positioning step serves to limit the plastic sleeve. An external thread of a certain height is provided on the outer surface of the pole body above the positioning step, and a sealing gasket is provided on the step end face of the positioning step. The plastic sleeve is arranged on the outside of the pole body, and a matching internal thread is provided in the plastic sleeve corresponding to the external thread on the outer surface of the pole. An annular boss is provided on the outside of the internal thread of the plastic sleeve, and the lower end plane of the annular boss is tightly attached to the step end face of the positioning step. The sealing rubber layer is arranged between the plastic sleeve and the pole body, and the sealing gasket forms a compression seal with the step end face of the pole body through the lower end plane of the plastic sleeve to prevent acid from crawling out along the pole.

[0009] The inner diameter of the non-threaded part of the plastic sleeve is larger than the diameter of the pole body, and the non-threaded parts of the plastic sleeve and the pole body are provided with a glue cavity, which is filled with a sealant layer. Since there is no complex component structure in the glue cavity, it can ensure that the colloid is in full contact with the pole body and the inner cavity at the upper end of the plastic sleeve, and it is not easy to form cavities or bubbles. The sealant can effectively protect the pole body from being corroded by acid and prevent the plastic sleeve from loosening upwards, thereby fixing the plastic sleeve.

[0010] The top of the sealant layer is flush with the top of the plastic sleeve.

[0011] The width of the glue-added cavity is not less than 3 mm.

[0012] The step end face of the positioning step is a smooth plane, and its outer diameter is consistent with the outer diameter of the sealing gasket.

[0013] The outer diameter of the annular boss is consistent with the outer diameter of the sealing gasket, and the lower end plane of the annular boss is a smooth plane, and its width is the same as the width of the sealing gasket.

[0014] The plastic sleeve is provided with three annular grooves on the outside, each of which is provided with an O-type sealing ring, and the width of the annular groove is adapted to the O-type sealing ring, so that the O-type sealing ring is conveniently inserted and not easily removed. When the composite pole body is pressed into the pole hole of the battery cover, the O-type sealing ring is fully in contact with the battery cover to form a compression seal.

[0015] The width of the annular groove is 3~6mm, which is close to the diameter of the O-ring. The inner diameter of the O-ring should be smaller than the outer diameter of the annular groove, so that the O-ring can be inserted easily and not easily removed. There is a gap between each O-ring, so that defects such as poor sealing will not occur due to the deflection of the pole body.

[0016] The outer diameter of the O-ring inserted into the annular groove should be larger than the outer diameter of the plastic sleeve. When the composite pole body is pressed into the pole hole of the battery cover, the O-ring is in full contact with the battery cover to form a compression seal to prevent the electrolyte from creeping out of the battery cover. The compression rate of the O-ring is controlled between 10% and 35%.

[0017] The O-type sealing ring and the sealing gasket are both made of EPDM rubber, the diameter of the O-type sealing ring is 3-6 mm, and the thickness of the sealing gasket is 3-6 mm.

[0018] The battery cover and the plastic sleeve are made of ABS, which has high strength, reasonable dimensional accuracy control, and fits tightly with the sealing member to ensure the reliability of the sealing.

[0019] The main material of the pole is lead alloy. During casting, the outer surface should be smooth without defects such as burrs and pits, and the dimensional accuracy should be reasonably controlled.

[0020] The sealing method using the maintenance-free battery pole sealing structure for mining of the present invention comprises the following steps: 1) Place the sealing gasket on the end face of the positioning step of the pole body, then insert the plastic sleeve from the top of the pole body for threaded connection; 2) Pour sealant into the glue-added cavity between the plastic sleeve and the pole body to form a secondary seal. The pouring height is flush with the top height of the plastic sleeve, and then high-temperature curing is performed. An O-ring is inserted into the annular groove outside the plastic sleeve to form a composite pole body; 3) After welding the battery plates and composite poles, form a pole group, install it into the battery slot, calibrate the composite pole to meet the requirements of matching with the battery cover, and then press the battery cover into the pole group from top to bottom, so that the composite pole passes through the pole hole and is heat-sealed with the battery slot in place. After gas pressure is pressed to 50kPa and no leakage is detected, the battery assembly is completed. The tightening torque of the threaded connection in step 1) is 10-15 N·m.

[0021] Two-component epoxy sealant is used during glue filling.

[0022] Compared with the prior art, the present invention has the following beneficial effects: 1. The composite pole body of the present invention and the sealing sleeve adopt a double sealing method combining sealing gasket compression and glue injection, which greatly improves the reliability of the seal and effectively prevents the acid from creeping out along the pole.

[0023] 2. The composite pole body of the present invention is sealed with multiple sealing rings on the outside. When the pole body is deflected, the O-ring at the bottom of one side is squeezed, and the O-ring at the bottom of the opposite side is loosened, but the O-ring at the top of the opposite side must be in a squeezed sealing state. Therefore, this design will not cause defects such as poor sealing due to the deflection of the pole body.

[0024] 3. The present invention is simpler than the existing structure and has higher reliability. It only requires the composite pole body to be filled with glue and cured at high temperature, and there is no need to fill glue and cure the battery at high temperature, which can reduce the investment in equipment such as high-temperature curing of the battery, simplify the process flow, facilitate installation, improve production efficiency, and reduce manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the pole sealing structure of the maintenance-free battery for mining according to the present invention; Figure 2 It is a partial enlarged view of A of the pole sealing structure of the maintenance-free battery for mining of the present invention; Figure 3 It is a schematic diagram of the composite pole body A of the pole sealing structure of the maintenance-free battery for mining of the present invention without the injection of sealant; In the figure: 1. pole body; 2. battery cover; 3. plastic sleeve; 4. sealant layer; 5. O-ring; 6. composite pole body; 7. sealing gasket; 8. internal thread; 9. external thread; 10. positioning step; 11. step end face; 12. lower end plane; 13. annular boss; 14. annular groove; 15. glue-added cavity; 16. pole hole. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the embodiments.

[0027] Unless otherwise specified, all raw materials used in the examples are commercially available.

[0028] Example 1 Take DM385KT as an example. Figure 1-3 As shown, the maintenance-free battery pole sealing structure for mining includes a battery cover 2, on which a pole hole 16 is provided, and also includes a composite pole body 6, the top of the composite pole body 6 passes through the pole hole 16 on the battery cover 2, and three O-rings 5 ​​are arranged in parallel from top to bottom between the composite pole body 6 and the pole hole 16, and a sealed connection is formed by interference fit; The composite pole body 6 comprises a pole body 1, a plastic sleeve 3, a sealing rubber layer 4 and a sealing gasket 7. A positioning step 10 is provided at the bottom of the pole body 1. The positioning step 10 limits the plastic sleeve 3. An external thread 9 is provided on the outer surface of the pole body 1 above the positioning step 10. A sealing gasket 7 is provided on the step end face 11 of the positioning step 10. The plastic sleeve 3 is arranged outside the pole body 1. A matching internal thread 8 is provided inside the plastic sleeve 3 corresponding to the external thread 9 on the outer surface of the pole. An annular boss 13 is provided outside the internal thread 8 of the plastic sleeve 3. The lower end plane 12 of the annular boss 13 is in close contact with the step end face 11 of the positioning step 10. The sealing rubber layer 4 is arranged between the plastic sleeve 3 and the pole body 1. The sealing gasket 7 forms a compression seal with the step end face 11 of the pole body 1 through the lower end plane 12 of the plastic sleeve 3 to prevent the acid from crawling out along the pole.

[0029] The inner diameter of the non-threaded part of the plastic sleeve 3 is larger than the diameter of the pole body 1, and the non-threaded parts of the plastic sleeve 3 and the pole body 1 are provided with a glue cavity 15, and the glue cavity 15 is filled with a sealant layer 4. Since there is no complicated component structure in the glue cavity 15, it can be ensured that the colloid is fully in contact with the pole body 1 and the inner cavity of the upper end of the plastic sleeve 3, and it is not easy to form cavities or bubbles. The sealant can effectively protect the pole body 1 from being corroded by acid, and prevent the plastic sleeve 3 from loosening upwards, so as to fix the plastic sleeve 3.

[0030] The top of the sealant layer 4 is flush with the top of the plastic sleeve 3 .

[0031] The width of the glue adding cavity 15 is 5 mm.

[0032] The step end surface 11 of the positioning step 10 is a smooth plane, and its outer diameter is consistent with the outer diameter of the sealing gasket 7 .

[0033] The outer diameter of the annular boss 13 is consistent with the outer diameter of the sealing gasket 7 . The lower end plane 12 of the annular boss 13 is a smooth plane, and its width is the same as that of the sealing gasket 7 .

[0034] The plastic sleeve 3 is provided with three annular grooves 14 on the outside, each of which is provided with an O-ring 5. The width of the annular groove 14 is adapted to the O-ring 5, so that the O-ring 5 can be inserted easily and not easily removed. When the composite pole body 6 is pressed into the pole hole 16 of the battery cover 2, the O-ring 5 is in full contact with the battery cover 2 to form a compression seal.

[0035] The width of the annular groove 14 is 3.5 mm, which is close to the diameter of the O-ring 5. The inner diameter of the O-ring 5 should be smaller than the outer diameter of the annular groove 14, so that the O-ring 5 can be inserted easily and not easily removed. There is a gap between each O-ring 5, so that defects such as poor sealing will not occur due to the deflection of the pole body 1.

[0036] The outer diameter of the O-ring 5 inserted into the annular groove 14 should be larger than the outer diameter of the plastic sleeve 3. When the composite pole body 6 is pressed into the pole hole 16 of the battery cover 2, the O-ring 5 is in full contact with the battery cover 2 to form a compression seal to prevent the electrolyte from creeping out of the battery cover 2. The compression rate of the O-ring 5 is 20%.

[0037] The O-ring 5 and the sealing gasket 7 are both made of EPDM rubber. The diameter of the O-ring 5 is 3.5 mm, and the thickness of the sealing gasket 7 is 3.5 mm.

[0038] The battery cover 2 and the plastic sleeve 3 are both made of ABS, which has high strength, reasonable dimensional accuracy control, and fits tightly with the sealing member to ensure the reliability of the sealing.

[0039] The main material of the pole is lead alloy. During casting, the outer surface should be smooth without defects such as burrs and pits, and the dimensional accuracy should be reasonably controlled.

[0040] The sealing method using the maintenance-free battery pole sealing structure for mining comprises the following steps: 1) Place the sealing gasket 7 on the step end face 11 of the positioning step 10 of the pole body 1, and then insert the plastic sleeve 3 from the top of the pole body 1 for threaded connection. The tightening torque is 11 N•m. 2) Fill the sealant MT641 produced by Dongtai Haoli New Materials Co., Ltd. into the glue cavity 15 between the plastic sleeve 3 and the pole body 1 to form a secondary seal. The filling height is flush with the top height of the plastic sleeve 3, and then cure at 60°C for 2h. Insert the O-ring 5 into the annular groove 14 outside the plastic sleeve 3 to form a composite pole body 6; 3) After the battery plates and the composite pole column 6 are welded, a pole group is formed, which is then installed in the battery slot. The composite pole column 6 is calibrated to meet the requirements for matching with the battery cover 2, and then the battery cover 2 is pressed into the pole group from top to bottom, so that the composite pole column 6 passes through the pole hole 16 and is heat-sealed with the battery slot in place. After the gas is pressurized to 50 kPa and tested for air leakage, the battery assembly is completed.

[0041] The DM385KT battery manufactured by Example 1 was subjected to gas pressure test and electrical performance test. The battery sealing performance and electrical performance met the national standard requirements. The battery sealing structure was also subjected to acid immersion test: the assembled battery pack was placed in a liquid containing a density of 1.29 g / cm 3 The samples were placed in a sealed tank filled with sulfuric acid solution and dissected after 7 days to visually observe whether the sealing structure had acid leakage, corrosion, or color change.

[0042] The test results show that the sealing performance of the pole is good after long-term acid immersion, and there is no acid leakage, corrosion or color change.

[0043] Example 2 Take DM330KT as an example. Figure 1-3 As shown, the maintenance-free battery pole sealing structure for mining includes a battery cover 2, on which a pole hole 16 is provided, and also includes a composite pole body 6, the top of the composite pole body 6 passes through the pole hole 16 on the battery cover 2, and three O-rings 5 ​​are arranged in parallel from top to bottom between the composite pole body 6 and the pole hole 16, and a sealed connection is formed by interference fit; The composite pole body 6 comprises a pole body 1, a plastic sleeve 3, a sealing rubber layer 4 and a sealing gasket 7. A positioning step 10 is provided at the bottom of the pole body 1. The positioning step 10 limits the plastic sleeve 3. An external thread 9 is provided on the outer surface of the pole body 1 above the positioning step 10. A sealing gasket 7 is provided on the step end face 11 of the positioning step 10. The plastic sleeve 3 is arranged outside the pole body 1. A matching internal thread 8 is provided inside the plastic sleeve 3 corresponding to the external thread 9 on the outer surface of the pole. An annular boss 13 is provided outside the internal thread 8 of the plastic sleeve 3. The lower end plane 12 of the annular boss 13 is in close contact with the step end face 11 of the positioning step 10. The sealing rubber layer 4 is arranged between the plastic sleeve 3 and the pole body 1. The sealing gasket 7 forms a compression seal with the step end face 11 of the pole body 1 through the lower end plane 12 of the plastic sleeve 3 to prevent the acid from crawling out along the pole.

[0044] The inner diameter of the non-threaded part of the plastic sleeve 3 is larger than the diameter of the pole body 1, and the non-threaded parts of the plastic sleeve 3 and the pole body 1 are provided with a glue cavity 15, and the glue cavity 15 is filled with a sealant layer 4. Since there is no complicated component structure in the glue cavity 15, it can be ensured that the colloid is fully in contact with the pole body 1 and the inner cavity of the upper end of the plastic sleeve 3, and it is not easy to form cavities or bubbles. The sealant can effectively protect the pole body 1 from being corroded by acid, and prevent the plastic sleeve 3 from loosening upwards, so as to fix the plastic sleeve 3.

[0045] The top of the sealant layer 4 is flush with the top of the plastic sleeve 3 .

[0046] The width of the glue-adding cavity 15 is 5 mm.

[0047] The step end surface 11 of the positioning step 10 is a smooth plane, and its outer diameter is consistent with the outer diameter of the sealing gasket 7 .

[0048] The outer diameter of the annular boss 13 is consistent with the outer diameter of the sealing gasket 7 . The lower end plane 12 of the annular boss 13 is a smooth plane, and its width is the same as that of the sealing gasket 7 .

[0049] The plastic sleeve 3 is provided with three annular grooves 14 on the outside, each of which is provided with an O-ring 5. The width of the annular groove 14 is adapted to the O-ring 5, so that the O-ring 5 can be inserted easily and not easily removed. When the composite pole body 6 is pressed into the pole hole 16 of the battery cover 2, the O-ring 5 is in full contact with the battery cover 2 to form a compression seal.

[0050] The width of the annular groove 14 is 4.5 mm, which is close to the diameter of the O-ring 5. The inner diameter of the O-ring 5 should be smaller than the outer diameter of the annular groove 14, so that the O-ring 5 can be inserted easily and not easily removed. There is a gap between each O-ring 5, so that defects such as poor sealing will not occur due to the deflection of the pole body 1.

[0051] The outer diameter of the O-ring 5 inserted into the annular groove 14 should be larger than the outer diameter of the plastic sleeve 3. When the composite pole body 6 is pressed into the pole hole 16 of the battery cover 2, the O-ring 5 is in full contact with the battery cover 2 to form a compression seal to prevent the electrolyte from creeping out of the battery cover 2. The compression rate of the O-ring 5 is 22%.

[0052] The O-ring 5 and the sealing gasket 7 are both made of EPDM rubber. The diameter of the O-ring 5 is 4.5 mm, and the thickness of the sealing gasket 7 is 4.5 mm.

[0053] The battery cover 2 and the plastic sleeve 3 are both made of ABS, which has high strength, reasonable dimensional accuracy control, and fits tightly with the sealing member to ensure the reliability of the sealing.

[0054] The main material of the pole is lead alloy. During casting, the outer surface should be smooth without defects such as burrs and pits, and the dimensional accuracy should be reasonably controlled.

[0055] The sealing method using the maintenance-free battery pole sealing structure for mining comprises the following steps: 1) Place the sealing gasket 7 on the step end face 11 of the positioning step 10 of the pole body 1, and then insert the plastic sleeve 3 from the top of the pole body 1 for threaded connection. The tightening torque is 12N•m. 2) Fill the sealant MT641 produced by Dongtai Haoli New Materials Co., Ltd. into the glue cavity 15 between the plastic sleeve 3 and the pole body 1 to form a secondary seal. The filling height is flush with the top height of the plastic sleeve 3, and then cured at 60°C for 2h. Insert the O-ring 5 into the annular groove 14 outside the plastic sleeve 3 to form a composite pole body 6; 3) After the battery plates and the composite pole column 6 are welded, a pole group is formed, which is then installed in the battery slot. The composite pole column 6 is calibrated to meet the requirements for matching with the battery cover 2, and then the battery cover 2 is pressed into the pole group from top to bottom, so that the composite pole column 6 passes through the pole hole 16 and is heat-sealed with the battery slot in place. After the gas is pressurized to 50 kPa and tested for air leakage, the battery assembly is completed.

[0056] The DM330KT battery manufactured by Example 2 was subjected to gas pressure test and electrical performance test. The battery sealing performance and electrical performance met the national standard requirements. The battery sealing structure was also subjected to acid immersion test: the assembled battery pack was placed in a liquid containing a density of 1.29 g / cm 3 The samples were placed in a sealing tank filled with sulfuric acid solution and dissected after 7 days to visually observe whether the sealing structure had acid leakage, corrosion, or color change.

[0057] The test results show that the sealing performance of the pole is good after long-term acid immersion, and there is no acid leakage, corrosion or color change.

[0058] Example 3 Take DM440KT as an example. Figure 1-3 As shown, the maintenance-free battery pole sealing structure for mining includes a battery cover 2, on which a pole hole 16 is provided, and also includes a composite pole body 6, the top of the composite pole body 6 passes through the pole hole 16 on the battery cover 2, and three O-rings 5 ​​are arranged in parallel from top to bottom between the composite pole body 6 and the pole hole 16, and a sealed connection is formed by interference fit; The composite pole body 6 comprises a pole body 1, a plastic sleeve 3, a sealing rubber layer 4 and a sealing gasket 7. A positioning step 10 is provided at the bottom of the pole body 1. The positioning step 10 limits the plastic sleeve 3. An external thread 9 is provided on the outer surface of the pole body 1 above the positioning step 10. A sealing gasket 7 is provided on the step end face 11 of the positioning step 10. The plastic sleeve 3 is arranged outside the pole body 1. A matching internal thread 8 is provided inside the plastic sleeve 3 corresponding to the external thread 9 on the outer surface of the pole. An annular boss 13 is provided outside the internal thread 8 of the plastic sleeve 3. The lower end plane 12 of the annular boss 13 is in close contact with the step end face 11 of the positioning step 10. The sealing rubber layer 4 is arranged between the plastic sleeve 3 and the pole body 1. The sealing gasket 7 forms a compression seal with the step end face 11 of the pole body 1 through the lower end plane 12 of the plastic sleeve 3 to prevent the acid from crawling out along the pole.

[0059] The inner diameter of the non-threaded part of the plastic sleeve 3 is larger than the diameter of the pole body 1, and the non-threaded parts of the plastic sleeve 3 and the pole body 1 are provided with a glue cavity 15, and the glue cavity 15 is filled with a sealant layer 4. Since there is no complicated component structure in the glue cavity 15, it can be ensured that the colloid is fully in contact with the pole body 1 and the inner cavity of the upper end of the plastic sleeve 3, and it is not easy to form cavities or bubbles. The sealant can effectively protect the pole body 1 from being corroded by acid, and prevent the plastic sleeve 3 from loosening upwards, so as to fix the plastic sleeve 3.

[0060] The top of the sealant layer 4 is flush with the top of the plastic sleeve 3 .

[0061] The width of the glue-adding cavity 15 is 5 mm.

[0062] The step end surface 11 of the positioning step 10 is a smooth plane, and its outer diameter is consistent with the outer diameter of the sealing gasket 7 .

[0063] The outer diameter of the annular boss 13 is consistent with the outer diameter of the sealing gasket 7 . The lower end plane 12 of the annular boss 13 is a smooth plane, and its width is the same as that of the sealing gasket 7 .

[0064] The plastic sleeve 3 is provided with three annular grooves 14 on the outside, each of which is provided with an O-ring 5. The width of the annular groove 14 is adapted to the O-ring 5, so that the O-ring 5 can be inserted easily and not easily removed. When the composite pole body 6 is pressed into the pole hole 16 of the battery cover 2, the O-ring 5 is in full contact with the battery cover 2 to form a compression seal.

[0065] The width of the annular groove 14 is 5.5 mm, which is close to the diameter of the O-ring 5. The inner diameter of the O-ring 5 should be smaller than the outer diameter of the annular groove 14, so that the O-ring 5 can be inserted easily and not easily removed. There is a gap between each O-ring 5, so that defects such as poor sealing will not occur due to the deflection of the pole body 1.

[0066] The outer diameter of the O-ring 5 inserted into the annular groove 14 should be larger than the outer diameter of the plastic sleeve 3. When the composite pole body 6 is pressed into the pole hole 16 of the battery cover 2, the O-ring 5 is in full contact with the battery cover 2 to form a compression seal to prevent the electrolyte from creeping out of the battery cover 2. The compression rate of the O-ring 5 is 23%.

[0067] The O-ring 5 and the sealing gasket 7 are both made of EPDM rubber. The diameter of the O-ring 5 is 5.5 mm, and the thickness of the sealing gasket 7 is 5.5 mm.

[0068] The battery cover 2 and the plastic sleeve 3 are both made of ABS, which has high strength, reasonable dimensional accuracy control, and fits tightly with the sealing member to ensure the reliability of the sealing.

[0069] The main material of the pole is lead alloy. During casting, the outer surface should be smooth without defects such as burrs and pits, and the dimensional accuracy should be reasonably controlled.

[0070] The sealing method using the maintenance-free battery pole sealing structure for mining comprises the following steps: 1) Place the sealing gasket 7 on the step end face 11 of the positioning step 10 of the pole body 1, and then insert the plastic sleeve 3 from the top of the pole body 1 for threaded connection. The tightening torque is 14 N•m. 2) Fill the sealant MT641 produced by Dongtai Haoli New Materials Co., Ltd. into the glue cavity 15 between the plastic sleeve 3 and the pole body 1 to form a secondary seal. The filling height is flush with the top height of the plastic sleeve 3, and then cured at 60°C for 2h. Insert the O-ring 5 into the annular groove 14 outside the plastic sleeve 3 to form a composite pole body 6; 3) After the battery plates and the composite pole column 6 are welded, a pole group is formed, which is then installed in the battery slot. The composite pole column 6 is calibrated to meet the requirements for matching with the battery cover 2, and then the battery cover 2 is pressed into the pole group from top to bottom, so that the composite pole column 6 passes through the pole hole 16 and is heat-sealed with the battery slot in place. After the gas is pressurized to 50 kPa and tested for air leakage, the battery assembly is completed.

[0071] The DM440KT battery manufactured by Example 3 was subjected to gas pressure test and electrical performance test. The battery sealing performance and electrical performance met the national standard requirements. The battery sealing structure was also subjected to acid immersion test: the assembled battery pack was placed in a liquid containing a density of 1.29 g / cm 3 The samples were placed in a sealing tank filled with sulfuric acid solution and dissected after 7 days to visually observe whether the sealing structure had acid leakage, corrosion, or color change.

[0072] The test results show that the sealing performance of the pole is good after long-term acid immersion, and there is no acid leakage, corrosion or color change.

Claims

1. A maintenance-free battery pole sealing structure for mining, comprising a battery cover (2), wherein the battery cover (2) is provided with a pole hole (16), characterized in that: It also includes a composite pole body (6), the top of the composite pole body (6) passes through a pole hole (16) on the battery cover (2), and a plurality of O-rings (5) are arranged in parallel between the composite pole body (6) and the pole hole (16), forming a sealed connection through interference fit; The composite pole body (6) comprises a pole body (1), a plastic sleeve (3), a sealing rubber layer (4) and a sealing gasket (7); a positioning step (10) is provided at the bottom of the pole body (1); an external thread (9) is provided on the outer surface of the pole body (1) above the positioning step (10); a sealing gasket (7) is provided on the step end surface (11) of the positioning step (10); the plastic sleeve (3) is arranged outside the pole body (1); a matching internal thread (8) is provided inside the plastic sleeve (3) corresponding to the external thread (9) on the outer surface of the pole; an annular boss (13) is provided outside the internal thread (8) of the plastic sleeve (3); a lower end plane (12) of the annular boss (13) is in close contact with the step end surface (11) of the positioning step (10); and the sealing rubber layer (4) is arranged between the plastic sleeve (3) and the pole body (1).

2. The maintenance-free battery pole sealing structure for mining according to claim 1 is characterized in that: The inner diameter of the non-threaded portion of the plastic sleeve (3) is greater than the diameter of the pole body (1); the non-threaded portions of the plastic sleeve (3) and the pole body (1) are provided with a glue cavity (15), and the glue cavity (15) is filled with a sealing glue layer (4).

3. The maintenance-free battery pole sealing structure for mining according to claim 2 is characterized in that: The top of the sealant layer (4) is flush with the top of the plastic sleeve (3).

4. The maintenance-free battery pole sealing structure for mining according to claim 3 is characterized in that: The width of the glue adding cavity (15) is not less than 3 mm.

5. The maintenance-free battery pole sealing structure for mining according to claim 1 is characterized in that: The step end surface (11) of the positioning step (10) is a smooth plane, and its outer diameter is consistent with the outer diameter of the sealing gasket (7).

6. The maintenance-free battery pole sealing structure for mining according to claim 5 is characterized in that: The outer diameter of the annular boss (13) is consistent with the outer diameter of the sealing gasket (7); the lower end plane (12) of the annular boss (13) is a smooth plane, and its width is the same as the width of the sealing gasket (7).

7. The maintenance-free battery pole sealing structure for mining according to claim 1 is characterized in that: The plastic sleeve (3) is provided with three annular grooves (14) on the outside, each annular groove (14) is provided with an O-type sealing ring (5), and the width of the annular groove (14) is adapted to that of the O-type sealing ring (5).

8. A sealing method using the maintenance-free battery pole sealing structure for mining use according to any one of claims 1 to 7, characterized in that: The following steps are involved: 1) Place the sealing gasket (7) on the step end surface (11) of the positioning step (10) of the pole body (1), and then insert the plastic sleeve (3) from the top of the pole body (1) for threaded connection; 2) Filling the sealant into the sealant cavity (15) between the plastic sleeve (3) and the pole body (1) to a height that is flush with the top of the plastic sleeve (3), and then curing the sealant, inserting an O-ring (5) into the annular groove (14) outside the plastic sleeve (3), thereby forming a composite pole body (6); 3) After the battery plates and the composite pole column (6) are welded together to form a pole group, the pole group is installed in the battery slot, the composite pole column (6) is calibrated to meet the requirements of matching with the battery cover (2), and then the battery cover (2) is pressed into the pole group from top to bottom, so that the composite pole column (6) passes through the pole hole (16) and is heat-sealed and locked in place with the battery slot, and the gas is pressed. The battery assembly is completed.

9. The sealing method according to claim 8, characterized in that: The tightening torque of the threaded connection described in step 1) is 10-15 N•m.

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