A sealing method for a traction battery pole

Abstract

The present invention discloses a sealing method for a traction battery pole, comprising the following steps: S1: applying acid-resistant and high-temperature grease, pressing a telescopic sealing ring from bottom to top into the pole hole, and setting a gap between the top of the outer flange and the bottom of the pole hole; S2: placing a copper core pole and positive and negative plates into a mold, and forming a positive and negative pole group by welding; S3: installing the positive and negative pole groups into a battery slot, calibrating, and applying acid-resistant and high-temperature grease on the inner hole surface of the telescopic sealing ring; S4: using a heat sealing machine to grab the battery cover body that has been pressed into the telescopic sealing ring, aligning it, and pressing it after hot melting, so that the telescopic sealing ring and the copper core pole are closely matched, and the battery cover and the battery slot are sealed together at the hot melting point. During the use of the battery, when the positive pole expands, the copper core pole and the telescopic sealing ring can move upward together at the same time. The more it expands upward, the tighter the cooperation between the copper core pole, the telescopic sealing ring, and the pole hole is, thereby eliminating the phenomenon of acid creeping of the traction battery pole and improving the reliability of the use of the traction battery.

Description

Technical Field

[0001] The invention relates to the field of batteries, and in particular to a sealing method for a traction battery pole. Background Art

[0002] At present, there are two main methods for sealing traction battery poles. One is to directly weld and fuse the battery pole and the lead sleeve on the battery cover together. The other is to first heat-melt seal the battery slot cover, and then press a rubber ring between the pole and the battery cover hole to tighten the battery pole and achieve the effect of pole sealing.

[0003] In particular, large-capacity lead-acid traction batteries mostly use the second sealing method.

[0004] However, with this sealing method, since the rubber ring is pressed in later and fits and is fixed to the battery cover hole, as the battery is used for a longer time, the positive plate inside the battery expands, grows and extends, causing the rubber ring to be pushed out and deformed, making it easy for the battery to overflow with electrolyte in the later stages of use. In severe cases, it may even affect the sealing effect of the battery pole, causing acid seepage and leakage, affecting the normal use of the traction battery. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention aims to provide a sealing method for a traction battery pole to solve the problem that the internal electrolyte is prone to overflow when the battery is used for a long time. The specific technical solution is as follows:

[0006] A method for sealing a traction battery pole comprises the following steps:

[0007] S1: Apply acid-resistant and high-temperature grease to the junction between the outer side of the telescopic sealing ring and the sealing surface of the battery cover. The bottom of the telescopic sealing ring is provided with an outer flange. Press the telescopic sealing ring from bottom to top into the pole hole on the battery cover, and ensure that the gap between the top of the outer flange and the bottom of the pole hole is set;

[0008] S2: Place the copper core pole and the positive and negative plates into a mold and weld them together with molten lead to form a positive and negative electrode group;

[0009] S3: Install the positive and negative electrode groups into the battery slot, calibrate the center distance between the positive and negative copper core poles, and apply acid-resistant and high-temperature grease on the inner hole surface of the telescopic sealing ring;

[0010] S4: Use a heat sealing machine to first grab the battery cover with the telescopic sealing ring pressed into it, align the center of the inner hole of the telescopic sealing ring in the battery cover with the center of the copper core pole, press tightly after hot melting, so that the telescopic sealing ring and the copper core pole are closely matched, and seal the battery cover and the battery slot together at the hot melting point.

[0011] Furthermore, the gap between the outer flange and the bottom of the pole hole is 2-3 mm.

[0012] By leaving a gap of 2-3mm, which is used as a gap for the expansion of the telescopic sealing ring when the battery pole group expands, when the positive pole expands, the copper core pole and the telescopic sealing ring can move upward appropriately at the same time.

[0013] Further: In S1, before the telescopic sealing ring is pressed from bottom to top into the pole hole on the battery cover, a limiter is first arranged on the outer flange, the limiter is located between the outer flange and the bottom of the pole hole, and after the telescopic sealing ring is pressed into the pole hole, the limiter is removed.

[0014] By setting the limiter, there is no need to consider how to leave a gap of a specified distance when pressing the telescopic sealing ring, which facilitates operation.

[0015] Furthermore, the limiting member is a limiting ring, which is sleeved outside the telescopic sealing ring, and the height of the limiting ring is greater than the distance between the top of the outer flange and the bottom of the pole hole.

[0016] Since the telescopic sealing ring is elastic, it shrinks when squeezed and recovers after the limit ring is removed. Therefore, the height of the limit ring needs to be set slightly larger than the gap distance to ensure that the appropriate gap distance is finally left.

[0017] Furthermore: the limiting ring is a clamp.

[0018] The clamp-type limiting ring is easy to install and disassemble and can be reused.

[0019] Furthermore, the telescopic sealing ring is formed by one-step compression molding of EPDM rubber or silicone rubber.

[0020] Ensure that the telescopic sealing ring has a certain elasticity. When the positive electrode expands, the telescopic sealing ring has a certain telescopic ability to ensure that the telescopic sealing ring is not easily pushed out and deformed, thereby ensuring the normal use of the battery.

[0021] Furthermore, the diameter of the inner hole of the copper core pole and the telescopic sealing ring is 10-25mm.

[0022] The diameter of the mating part is set to 10-25mm to adapt to the mainstream models on the market.

[0023] Furthermore, the inner diameter of the pole hole gradually increases from top to bottom, with an upper diameter of 32.5-33.5 mm and a lower diameter of 33.2-33.4 mm.

[0024] By setting the inner diameter of the pole hole to gradually increase from top to bottom, the telescopic sealing ring becomes tighter and tighter when pressed in from the bottom and is not easy to fall off. When the positive electrode expands, the fit between the copper core pole, the telescopic sealing ring and the pole hole becomes tighter, and a good sealing effect is achieved.

[0025] Furthermore: the acid-resistant high-temperature grease is prepared by mixing lanolin and lanolin alcohol in a ratio of 2:1 and heating the mixture to 40°C to 60°C.

[0026] The lubricating grease produced by this method has stronger acid resistance and high temperature resistance.

[0027] Furthermore: a bell-mouth inclined surface opening downward is provided at the bottom center of the telescopic sealing ring.

[0028] On the one hand, the bell mouth slope opens when the telescopic sealing ring is pressed in, so that the outer flange is tilted upward, and the telescopic sealing ring is more easily pressed inward; on the other hand, it also plays a certain guiding role when the copper core pole is inserted.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] During the use of traction batteries, when the positive pole expands, the copper core pole and the telescopic sealing ring can move upward appropriately at the same time. The more the positive pole of the battery expands upward, the tighter the fit between the copper core pole, the telescopic sealing ring and the pole hole. The acid-resistant and high-temperature grease has good lubrication and protection effects, which delays the corrosion and aging of the telescopic sealing ring. The pole sealing effect is good, thereby eliminating the acid climbing phenomenon of the traction battery pole and improving the reliability of the traction battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the installation structure of the present invention. DETAILED DESCRIPTION

[0032] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0033] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" 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 indirectly connected 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.

[0035] like Figure 1 As shown, a sealing method for a traction battery pole comprises the following steps:

[0036] S1: Apply acid-resistant and high-temperature grease 3 to the junction between the outer side of the telescopic sealing ring 1 and the sealing surface of the battery cover 5, wherein the telescopic sealing ring 1 is formed by one-step pressing of EPDM rubber or silicone rubber, and an outer flange 11 is provided at the bottom of the telescopic sealing ring 1. Press the telescopic sealing ring 1 from bottom to top into the pole hole 4 on the battery cover 5, and ensure that a gap of 2-3 mm is left between the top of the outer flange 11 and the bottom of the pole hole 4;

[0037] S2: Place the copper core pole 2 and the positive and negative plates into a mold and weld them together with molten lead to form a positive and negative electrode group;

[0038] S3: Install the positive and negative electrode groups into the battery slot 6, calibrate the center distance between the positive and negative copper core poles, and apply acid-resistant and high-temperature grease 3 on the inner hole surface of the telescopic sealing ring 1;

[0039] S4: Use a heat sealing machine to first grab the battery cover 5 with the telescopic sealing ring 1 pressed into it, align the center of the inner hole of the telescopic sealing ring 1 in the battery cover 5 with the center of the copper core pole 2, press tightly after hot melting, so that the telescopic sealing ring 1 and the copper core pole 2 are closely matched, and seal the battery cover 5 and the battery slot 6 together at the hot melting point.

[0040] As a preferred embodiment, in S1, before the telescopic sealing ring 1 is pressed from bottom to top into the pole hole 4 on the battery cover 5, a limiter (not shown in the figure) is first provided on the outer flange 11, and the limiter is located between the outer flange 11 and the bottom of the pole hole 4. After the telescopic sealing ring 1 is pressed into the pole hole 4, the limiter is removed.

[0041] Among them, the limiting member is a limiting ring 6, which is sleeved on the outside of the telescopic sealing ring 1, and the height of the limiting ring 6 is greater than the distance between the top of the outer flange 11 and the bottom of the pole hole 4. The reason is that the telescopic sealing ring 1 is elastic and shrinks when squeezed, and will recover after the limiting ring is removed. Therefore, the height of the limiting ring needs to be set slightly larger than the gap distance to ensure that a suitable gap distance is finally reserved. The installation and removal method of the limiting ring is not limited. For example, it can be sleeved on the gap in advance, and then destroyed by cutting to complete the disassembly. A more economical approach is to use a clamp-type limiting ring, which can be used repeatedly and is also convenient to install and disassemble.

[0042] As a preferred embodiment, the diameter of the inner hole where the copper core pole 2 and the telescopic sealing ring 1 fit is 10-25 mm.

[0043] As a preferred embodiment, the inner diameter of the pole hole 4 gradually increases from top to bottom, with an upper diameter of 32.5-33.5 mm and a lower diameter of 33.2-33.4 mm, ensuring that the upper diameter is slightly smaller than the lower diameter. When the positive electrode expands, the pole hole 4 and the telescopic sealing ring 1 become tighter and tighter, ensuring good sealing and preventing the telescopic sealing ring from falling off easily.

[0044] Among them, acid-resistant high-temperature grease 3 is made by mixing lanolin and lanolin alcohol in a ratio of 2:1 and heating to 40℃~60℃. It not only plays a lubricating role during installation, but also prevents the telescopic sealing ring from aging at high temperature and improves the sealing effect of the traction battery pole.

[0045] A bell-mouth slope 12 opening downward is provided at the bottom center of the telescopic sealing ring 1. On the one hand, when the telescopic sealing ring 1 is pressed in, the extrusion portion abuts against the bell-mouth slope 12, so that the outer flange 11 is tilted upward, and the telescopic sealing ring 1 is easier to be pressed in; on the other hand, when the copper core pole 2 is inserted into the telescopic sealing ring 1, the bell-mouth slope 12 has a guiding effect, making it easier to insert and saving operation and installation time.

[0046] The installation method of the present invention has good sealing effect, thereby preventing the pole acid creep phenomenon, improving the reliability of the traction battery, and being suitable for promotion.

[0047] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for sealing a traction battery pole, characterized in that: The following steps are involved: S1: Apply acid-resistant and high-temperature grease (3) to the junction between the outer side of the telescopic sealing ring (1) and the sealing surface of the battery cover (5); the bottom of the telescopic sealing ring (1) is provided with an outer flange (11); the telescopic sealing ring (1) is pressed from bottom to top into the terminal hole (4) on the battery cover (5); and a gap is ensured between the top of the outer flange (11) and the bottom of the terminal hole (4); S2: Place the copper core pole (2) and the positive and negative electrode plates into a mold and weld them together with molten lead to form a positive and negative electrode group; S3: Install the positive and negative electrode groups into the battery slot (6), calibrate the center distance between the positive and negative copper core poles, and apply acid-resistant and high-temperature grease (3) to the inner hole surface of the telescopic sealing ring (1); S4: using a heat sealing machine to first grab the battery cover (5) into which the telescopic sealing ring (1) has been pressed, aligning the center of the inner hole of the telescopic sealing ring (1) in the battery cover (5) with the center of the copper core pole (2), and then pressing them tightly after hot melting, so that the telescopic sealing ring (1) and the copper core pole (2) are tightly matched, and the battery cover (5) and the battery slot (6) are sealed together at the hot melting point; In S1, before the telescopic sealing ring (1) is pressed upward into the pole hole (4) on the battery cover (5), a stopper is first arranged on the outer flange (11), the stopper being located between the outer flange (11) and the bottom of the pole hole (4), and after the telescopic sealing ring (1) is pressed into the pole hole (4), the stopper is removed; The limiting member is a limiting ring (6), the limiting ring (6) is sleeved on the outside of the telescopic sealing ring (1), and the height of the limiting ring (6) is greater than the distance between the top of the outer flange (11) and the bottom of the pole hole (4); The inner diameter of the pole hole (4) gradually increases from top to bottom, with the upper diameter being 32.5-33.5 mm and the lower diameter being 33.2-33.4 mm.

2. The sealing method for a traction battery pole according to claim 1, characterized in that: The gap between the outer flange (11) and the bottom of the pole hole (4) is 2-3 mm.

3. The sealing method for a traction battery pole according to claim 1, characterized in that: The limiting ring (6) is a clamp.

4. The sealing method for a traction battery pole according to claim 1, characterized in that: The telescopic sealing ring (1) is made of EPDM rubber or silicone rubber and is formed by one-step pressing.

5. The sealing method for a traction battery pole according to claim 1, characterized in that: The diameter of the inner hole where the copper core pole (2) and the telescopic sealing ring (1) meet is 10-25 mm.

6. The sealing method of the traction battery pole according to claim 1, characterized in that: The acid-resistant high-temperature grease (3) is prepared by mixing lanolin and lanolin alcohol in a ratio of 2:1 and heating the mixture to 40°C to 60°C.

7. The sealing method for a traction battery pole according to any one of claims 1 to 6, characterized in that: A bell-mouth inclined surface (12) opening downward is provided at the bottom center of the telescopic sealing ring (1).

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