阅读说明：本技术 一种电动车控制器专用铝电解电容器的制备工艺 (Preparation process of aluminum electrolytic capacitor special for electric vehicle controller ) 是由 左文全 张力维 张运嘉 于 2021-08-03 设计创作，主要内容包括：本发明公开了一种电动车控制器专用铝电解电容器的制备工艺,该工艺旨在解决现今电动车控制器使用的铝电解电容器存在所能承受的电流量较为普通,极大地制约了电动车控制器的使用寿命,同时导致其可靠性大幅下降的技术问题。该工艺的大致步骤为：将正负铝箔钉接上引出线,于负极铆接位置处通过钉接机贴上负极垫箔,并在自动卷绕机上中间衬垫电解纸卷绕成芯包；将芯包置于高温干燥箱中进行烘干,之后将芯包取出并放入电解液中,通过抽真空和空气加压的方式,使芯包浸泡电解液；将吸有电解液的芯包用铝壳和橡胶密封塞进行封装；将封装后的祼品电容套上具有绝缘和保护作用的外皮套管,并按正负极性并联排列进行充电修复,得到铝电解电容器。(The invention discloses a preparation process of an aluminum electrolytic capacitor special for an electric vehicle controller, which aims to solve the technical problems that the aluminum electrolytic capacitor used by the existing electric vehicle controller can bear more common current, the service life of the electric vehicle controller is greatly restricted, and the reliability of the electric vehicle controller is greatly reduced. The process comprises the following steps: nailing the positive and negative aluminum foils with the outgoing lines, attaching a negative pad foil at the negative riveting position through a nailing machine, and coiling the electrolytic paper on the middle pad of an automatic winding machine into a core package; placing the core bag in a high-temperature drying box for drying, then taking out the core bag and putting the core bag into electrolyte, and soaking the core bag in the electrolyte in a vacuumizing and air pressurizing mode; packaging the core package absorbed with the electrolyte by using an aluminum shell and a rubber sealing plug; and covering the bare article capacitor with a sheath sleeve with insulating and protecting functions, and arranging the bare article capacitor in parallel according to the positive and negative polarities for charging and repairing to obtain the aluminum electrolytic capacitor.)

1. A preparation process of an aluminum electrolytic capacitor special for an electric vehicle controller is characterized by comprising the following specific steps:

firstly, nailing positive and negative aluminum foils with an outgoing line, using a CP line as the outgoing line, controlling the thickness of nailing flowers within 42 mu m, and controlling the nailing impedance to be less than 0.5m omega, meanwhile, sticking a negative pad foil at a negative riveting position through a nailing machine, and winding electrolytic paper into a core package on a middle pad of an automatic winding machine;

wherein the positive electrode foil has a withstand voltage of 142VF or more and a specific volume of 4.8uf/cm²The above; the negative electrode foil has a withstand voltage of 2.0VF or more and a specific volume of 300uf/cm²The above; the diameter of the CP wire is more than 0.85 μm;

secondly, placing the core bag in a high-temperature drying box for drying, controlling the drying temperature to be 80-90 ℃ and the drying time to be 55-65min, then taking out the core bag and placing the core bag into electrolyte, and soaking the core bag in the electrolyte in a vacuumizing and air pressurizing mode;

wherein the sparking voltage of the electrolyte is more than 370V, and the conductivity is 12.5 ms/cm;

step three, packaging the core bag absorbed with the electrolyte by using an aluminum shell and a rubber sealing plug, so that the electrolyte is not easy to volatilize and has the capability of repairing an oxidation film;

and step four, sheathing the bare article capacitor with a sheath sleeve with insulation and protection functions, and arranging the bare article capacitor in parallel according to the positive and negative polarities for charging and repairing to obtain the aluminum electrolytic capacitor special for the electric vehicle controller.

2. The preparation process of the aluminum electrolytic capacitor special for the electric vehicle controller as claimed in claim 1, wherein in the first step, the outgoing line is made of G4 aluminum wire, and the model is 20190; the model of the electrolytic paper is SD 260-60.

3. The preparation process of the aluminum electrolytic capacitor special for the electric vehicle controller as claimed in claim 1, wherein in the second step, the core package is placed in a high temperature drying oven for drying, the drying temperature is controlled to be 85 ℃ and the drying time is controlled to be 60 min.

4. The manufacturing process of the aluminum electrolytic capacitor special for the electric vehicle controller as claimed in claim 1, wherein in the third step, the aluminum case is made of pure aluminum with a purity of 99.5%, and is obtained by stretch forming; the rubber sealing plug is made of a mixture of ethylene propylene diene monomer and butyl rubber.

Technical Field

The invention belongs to the field of preparation of novel electronic components, particularly relates to a preparation process of a special aluminum electrolytic capacitor for an electric vehicle controller, and particularly relates to a preparation process of a special aluminum electrolytic capacitor which is not easy to damage when an electric vehicle is used in an abnormal environment.

Background

The aluminum electrolytic capacitor is also called as a capacitor, is an energy storage element, can be divided into three types of structures, namely a fixed capacitor, a semi-variable capacitor and a variable capacitor, and has the characteristics of large capacity, large electric leakage, large error and poor stability, is commonly used as an alternating current bypass and a filter, and is also used for signal coupling when the requirement is not high, so that the aluminum electrolytic capacitor is widely applied to electronic circuits, and all electronic products need to be rectified by the input filter of the aluminum electrolytic capacitor when alternating current is converted into direct current.

At present, the aluminum electrolytic capacitor is applied to an electronic circuit of an electric vehicle controller, and has the main functions of reducing the load of a battery and playing a role of shunting, so that the service life of the battery can be effectively prolonged; the aluminum electrolytic capacitor has the function of isolating direct current and direct current, the internal resistance of the storage battery of the electric vehicle is generally several ohms at zero, the motor of the electric vehicle needs a driver, and the driver of the electric vehicle is a frequency conversion device, has the function of inversion when in work, and sends electric energy pulses with a certain sequence to the motor to enable the motor to generate rotating torque. The current passing through the driver is pulsed in the working process, so that in order to reduce the influence of the internal resistance of the storage battery on the driver, a large aluminum electrolytic capacitor must be connected in parallel, and when the frequency of the driver is high enough, the aluminum electrolytic capacitor is equivalent to an alternating current short circuit, so that the current of the driver cannot be influenced by the internal resistance of the storage battery.

Aiming at the use environment of an electric vehicle controller, the aluminum electrolytic capacitor in the component has special performance requirements, namely the aluminum electrolytic capacitor is required to bear larger alternating current; however, the amount of current that can be borne by the aluminum electrolytic capacitor used on the existing electric vehicle controller is relatively common, which greatly restricts the service life of the electric vehicle controller and causes the reliability of the electric vehicle controller to be greatly reduced, and particularly, when the electric vehicle is used in a severe state requiring climbing and overload, the controller damage is mainly caused by that the aluminum electrolytic capacitor cannot bear large current, so that breakthrough research and development of an aluminum electrolytic aluminum device special for the electric vehicle controller capable of bearing large current are urgently needed, thereby meeting the required performance and market demand.

Disclosure of Invention

(1) Technical problem to be solved

Aiming at the defects of the prior art, the invention aims to provide a preparation process of an aluminum electrolytic capacitor special for an electric vehicle controller, which aims to solve the technical problems that the aluminum electrolytic capacitor used by the electric vehicle controller can bear more common current, the service life of the electric vehicle controller is greatly restricted, and the reliability of the electric vehicle controller is greatly reduced.

(2) Technical scheme

In order to solve the technical problem, the invention provides a preparation process of an aluminum electrolytic capacitor special for an electric vehicle controller, which comprises the following specific steps:

firstly, nailing positive and negative aluminum foils with an outgoing line, using a CP line as the outgoing line, controlling the thickness of nailing flowers within 42 mu m, and controlling the nailing impedance to be less than 0.5m omega, meanwhile, sticking a negative pad foil at a negative riveting position through a nailing machine, and winding electrolytic paper into a core package on a middle pad of an automatic winding machine;

wherein the positive electrode foil has a withstand voltage of 142VF or more and a specific volume of 4.8uf/cm²The above; the negative electrode foil has a withstand voltage of 2.0VF or more and a specific volume of 300uf/cm²The above; the diameter of the CP wire is more than 0.85 μm;

secondly, placing the core bag in a high-temperature drying box for drying, controlling the drying temperature to be 80-90 ℃ and the drying time to be 55-65min, then taking out the core bag and placing the core bag into electrolyte, and soaking the core bag in the electrolyte in a vacuumizing and air pressurizing mode;

wherein the sparking voltage of the electrolyte is more than 370V, and the conductivity is 12.5 ms/cm;

step three, packaging the core bag absorbed with the electrolyte by using an aluminum shell and a rubber sealing plug, so that the electrolyte is not easy to volatilize and has the capability of repairing an oxidation film;

and step four, sheathing the bare article capacitor with a sheath sleeve with insulation and protection functions, and arranging the bare article capacitor in parallel according to the positive and negative polarities for charging and repairing to obtain the aluminum electrolytic capacitor special for the electric vehicle controller.

Preferably, in the step one, the outgoing line is made of a G4 aluminum wire, and the model is 20190; the model of the electrolytic paper is SD 260-60.

Preferably, in the second step, the core package is placed in a high-temperature drying oven for drying, the drying temperature is controlled to be 85 ℃, and the drying time is controlled to be 60 min.

Preferably, in the third step, the aluminum shell is made of pure aluminum with the purity of 99.5%, and is obtained by stretch forming; the rubber sealing plug is made of a mixture of ethylene propylene diene monomer and butyl rubber.

In addition, in step one, m Ω is the unit of resistance, meaning milliohms.

The aluminum electrolytic capacitor is insulated and separated by the middle of two polar plates with a positive pole and a negative pole, wherein a specific valve metal is adopted as a positive pole foil, an extremely thin oxide film with one-way conductivity is generated on the surface of the metal by an electrochemical method and is used as a medium, and a liquid electrolyte capable of generating and repairing the medium oxide film is usually adopted as a cathode.

(3) Advantageous effects

Compared with the prior art, the invention has the beneficial effects that: the aluminum electrolytic capacitor produced by the technical scheme of the invention not only improves the nail connection effect, enables the capacitor to bear 10A heavy current test, and enables the product not to be implosion by improving the wire diameter of the guide pin (namely the lead-out wire), pasting the negative pad foil by the nail connection machine and combining the specific nail connection and positive and negative foil performances, and the specific drying condition and electrolyte performance, but also greatly reduces the heating of the product body, the continuous test frequency can reach more than 1000 times, and the traditional electrolytic capacitor can only bear 4-5A current when being subjected to the heavy current test, and is easy to explode and fail to heat.

The aluminum electrolytic capacitor produced by the technical scheme of the invention can be widely applied to an electric vehicle controller, so that the electric vehicle can still be used normally and safely under the severe conditions of climbing and overload; meanwhile, when the frequency of the electric vehicle driver reaches the maximum, the aluminum electrolytic capacitor is in an alternating current short circuit condition, and heating failure is avoided, so that the current of the driver is effectively protected from being influenced by the large current of the storage battery, and the reliability of the electric vehicle is greatly improved.

Detailed Description

In order to make the technical means, the original characteristics, the achieved purposes and the effects of the invention easily understood and obvious, the technical solutions in the embodiments of the present invention are clearly and completely described below to further illustrate the invention, and obviously, the described embodiments are only a part of the embodiments of the present invention, but not all the embodiments.

Example 1

The specific implementation mode is to prepare the aluminum electrolytic capacitor, the aluminum electrolytic capacitor belongs to the special use of the electric vehicle controller, and the specific steps of the process are as follows:

step one, nailing positive and negative aluminum foils to lead-out wires (the withstand voltage of the positive foil is more than 142VF, and the specific volume is 4.8 uf/cm)²The above; the negative electrode foil has a withstand voltage of 2.0VF or more and a specific volume of 300uf/cm²In the method, a CP wire is used as an outgoing wire, the outgoing wire is made of G4 aluminum wire and is of a model 20190, the wire diameter of the CP wire is more than 0.85 mu m, the thickness of a nail-joint nail flower is controlled to be within 42 mu m, the nail-joint impedance is less than 0.5m omega, meanwhile, a negative electrode pad foil is attached to a negative electrode riveting position through a nailing machine, an electrolytic paper is wound into a core package on an automatic winding machine in a middle liner manner, and the model of the electrolytic paper is SD 260-60;

step two, placing the core bag in a high-temperature drying box for drying, controlling the drying temperature to be 80 ℃ and the drying time to be 65min, then taking out the core bag and placing the core bag into electrolyte, and soaking the core bag in the electrolyte in a vacuum pumping and air pressurizing mode (so that the sparking voltage of the electrolyte is more than 370V, and the conductivity is 12.5 ms/cm);

step three, packaging the core bag absorbed with the electrolyte by using an aluminum shell and a rubber sealing plug, so that the electrolyte is not easy to volatilize, the aluminum shell has the capability of repairing an oxide film, the aluminum shell is made of pure aluminum with the purity of 99.5%, the aluminum shell is obtained by stretching and forming, and the rubber sealing plug is made of a mixture of ethylene propylene diene monomer and butyl rubber;

and step four, sheathing the bare article capacitor with a sheath sleeve with insulation and protection functions, and arranging the bare article capacitor in parallel according to the positive and negative polarities for charging and repairing to obtain the aluminum electrolytic capacitor special for the electric vehicle controller.

Example 2

The specific implementation mode is to prepare the aluminum electrolytic capacitor, the aluminum electrolytic capacitor belongs to the special use of the electric vehicle controller, and the specific steps of the process are as follows:

step one, nailing positive and negative aluminum foils to lead-out wires (the withstand voltage of the positive foil is more than 142VF, and the specific volume is 4.8 uf/cm)²The above; the negative electrode foil has a withstand voltage of 2.0VF or more and a specific volume of 300uf/cm²In the method, a CP wire is used as an outgoing wire, the outgoing wire is made of G4 aluminum wire and is of a model 20190, the wire diameter of the CP wire is more than 0.85 mu m, the thickness of a nail-joint nail flower is controlled to be within 42 mu m, the nail-joint impedance is less than 0.5m omega, meanwhile, a negative electrode pad foil is attached to a negative electrode riveting position through a nailing machine, an electrolytic paper is wound into a core package on an automatic winding machine in a middle liner manner, and the model of the electrolytic paper is SD 260-60;

step two, placing the core bag in a high-temperature drying box for drying, controlling the drying temperature to be 85 ℃ and the drying time to be 60min, then taking out the core bag and placing the core bag into electrolyte, and soaking the core bag in the electrolyte in a vacuum pumping and air pressurizing mode (so that the sparking voltage of the electrolyte is more than 370V, and the conductivity is 12.5 ms/cm);

step three, packaging the core bag absorbed with the electrolyte by using an aluminum shell and a rubber sealing plug, so that the electrolyte is not easy to volatilize, the aluminum shell has the capability of repairing an oxide film, the aluminum shell is made of pure aluminum with the purity of 99.5%, the aluminum shell is obtained by stretching and forming, and the rubber sealing plug is made of a mixture of ethylene propylene diene monomer and butyl rubber;

and step four, sheathing the bare article capacitor with a sheath sleeve with insulation and protection functions, and arranging the bare article capacitor in parallel according to the positive and negative polarities for charging and repairing to obtain the aluminum electrolytic capacitor special for the electric vehicle controller.

Example 3

The specific implementation mode is to prepare the aluminum electrolytic capacitor, the aluminum electrolytic capacitor belongs to the special use of the electric vehicle controller, and the specific steps of the process are as follows:

step one, nailing positive and negative aluminum foils to lead-out wires (the withstand voltage of the positive foil is more than 142VF, and the specific volume is 4.8 uf/cm)²The above; the negative electrode foil has a withstand voltage of 2.0VF or more and a specific volume of 300uf/cm²In the method, a CP wire is used as an outgoing wire, the outgoing wire is made of G4 aluminum wire and is of a model 20190, the wire diameter of the CP wire is more than 0.85 mu m, the thickness of a nail-joint nail flower is controlled to be within 42 mu m, the nail-joint impedance is less than 0.5m omega, meanwhile, a negative electrode pad foil is attached to a negative electrode riveting position through a nailing machine, an electrolytic paper is wound into a core package on an automatic winding machine in a middle liner manner, and the model of the electrolytic paper is SD 260-60;

step two, placing the core bag in a high-temperature drying box for drying, controlling the drying temperature to be 90 ℃ and the drying time to be 55min, then taking out the core bag and placing the core bag into electrolyte, and soaking the core bag in the electrolyte in a vacuum pumping and air pressurizing mode (so that the sparking voltage of the electrolyte is more than 370V, and the conductivity is 12.5 ms/cm);

step three, packaging the core bag absorbed with the electrolyte by using an aluminum shell and a rubber sealing plug, so that the electrolyte is not easy to volatilize, the aluminum shell has the capability of repairing an oxide film, the aluminum shell is made of pure aluminum with the purity of 99.5%, the aluminum shell is obtained by stretching and forming, and the rubber sealing plug is made of a mixture of ethylene propylene diene monomer and butyl rubber;

and step four, sheathing the bare article capacitor with a sheath sleeve with insulation and protection functions, and arranging the bare article capacitor in parallel according to the positive and negative polarities for charging and repairing to obtain the aluminum electrolytic capacitor special for the electric vehicle controller.

Test detection

The current test is carried out on the aluminum electrolytic capacitor special for the electric vehicle controller respectively prepared by the 3 specific embodiments, and the test can obviously show that the aluminum electrolytic capacitor prepared by the technical scheme of the invention can bear the heavy current test of 10A, does not generate implosion, greatly reduces the heating of the product body, and can reach more than 1000 times after continuous test,

therefore, the aluminum electrolytic capacitor produced by the technical scheme of the invention can be widely applied to an electric vehicle controller, so that the electric vehicle can still be normally and safely used in a severe state of climbing and overload; meanwhile, when the frequency of the electric vehicle driver reaches the maximum, the aluminum electrolytic capacitor is in an alternating current short circuit condition, and heating failure is avoided, so that the current of the driver is effectively protected from being influenced by the large current of the storage battery, and the reliability of the electric vehicle is greatly improved.

Having thus described the principal technical features and basic principles of the invention, and the advantages associated therewith, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Furthermore, it should be understood that although the present description is described in terms of various embodiments, not every embodiment includes only a single embodiment, and such descriptions are provided for clarity only, and those skilled in the art will recognize that the embodiments described herein can be combined as a whole to form other embodiments as would be understood by those skilled in the art.