Lead-acid battery structure for formation

Abstract

The utility model discloses a lead-acid battery structure for formation, including a temperature collection mechanism, which includes: a temperature collection contact piece, which is placed on the surface of one of the pole plates of the pole group and assembled into a battery slot together with the pole plate; a temperature collection line, which has two conductors forming a thermocouple temperature measurement structure, and the temperature collection line passes through the battery slot, one end of which is connected to the temperature collection contact piece, and the other end is connected to a temperature collector; the temperature collector is used to collect the temperature from the temperature collection line. The lead-acid battery structure for formation of the utility model ensures the stability and accuracy of the collected temperature by placing the temperature collection contact piece on the surface of one of the pole plates of the pole group and assembling it into the battery slot together with the pole plate.

Description

Technical Field

[0001] The utility model belongs to the technical field of lead-acid batteries, and in particular relates to a lead-acid battery structure for formation. Background Art

[0002] In the production process of lead-acid batteries, formation is a basic process in the battery manufacturing process. Through this process, the solidified green plate lead paste is converted into active substances to generate PbO on the positive plate. 2 , sponge-like metallic lead Pb is generated on the negative plate. Chemical formation is a complex system change, including chemical, electrochemical, crystallographic and other changes. The conversion process will cause continuous structural changes in the porous medium.

[0003] The formation methods of battery plates are generally divided into two types: external formation (plate tank formation) and internal formation. In response to the requirements of energy conservation and environmental protection, batteries currently basically adopt the internal formation method.

[0004] From the perspective of the state of the electrolyte, the battery internal formation method can be divided into lean liquid quantitative acid addition (VRLA) and rich liquid battery secondary acid exchange (first quantitatively add low-density 1.05g / cm 3 ~1.18g / cm 3 Sulfuric acid electrolyte, after the formation is completed, pour out the acid and add 1.28g / cm 3 ~1.32g / cm 3 There are three modes: sulfuric acid electrolyte (sulfuric acid electrolyte) formation mode and rich electrolyte internal circulation formation mode. From the comprehensive comparative analysis of formation effect, economic benefit and consistency of battery performance, the internal acid circulation formation mode has certain advantages.

[0005] Since the green plates will undergo an exothermic neutralization reaction between the electrolyte and the alkaline lead paste after acid addition, if the battery temperature is too high (≧60°C), it will be detrimental to the later battery performance. Therefore, the electrolyte needs to be treated with cold acid before acid addition, and the electrolyte temperature is generally controlled within the range of 0°C to 10°C. After acid addition, the battery also needs to be pre-treated with water cooling. Affected by environmental factors, the water bath temperature will also change, resulting in differences in the battery formation effect. In addition, affected by the formation process in the battery, the temperature of the plates in the battery is also constantly fluctuating during the formation process.

[0006] The negative electrode of the battery is added with lignin sulfonate expansion active additives to prevent lead paste from shrinking. Such additives are easily decomposed and released when heated at 60℃~85℃, thus having a negative impact on the low temperature and charge and discharge performance of the battery. Therefore, it is very important to timely adjust and optimize the process parameters of each stage of acidification by tracking and detecting the plate temperature during the acidification process.

[0007] The traditional methods for detecting battery temperature changes during the battery formation process mainly include: using a thermometer to test the residual acid temperature on the top of the battery cell, the temperature of the outer surface of the battery shell, the water temperature test in a water bath, etc. None of the above methods for testing battery temperature can reflect the actual temperature changes of the plates inside the battery. Utility Model Content

[0008] The utility model aims at the above-mentioned deficiencies in the prior art and provides a lead-acid battery structure for formation.

[0009] A lead-acid battery structure for formation includes a battery tank and a battery cover. The inner cavity of the battery tank is divided into a plurality of cells, each cell is provided with a pole group, the pole group includes a pole plate, the pole plate is divided into a positive pole plate and a negative pole plate, the top surface of the pole plate has a pole ear, and the pole ears of the same polarity in the same pole group are connected in series by a bus bar. The lead-acid battery structure for formation also includes a temperature collection mechanism, and the temperature collection mechanism includes:

[0010] The temperature sensing contact piece is placed on the surface of one of the plates of the pole group and assembled into the battery slot together with the plate;

[0011] A temperature collection line, having two conductors forming a thermocouple temperature measurement structure, the temperature collection line passes through the battery slot, one end of the temperature collection line is connected to the temperature collection contact piece, and the other end is connected to the temperature collection instrument;

[0012] The temperature collector is used to collect the temperature from the temperature collection line.

[0013] Preferably, the material of the temperature sensing contact piece is pure lead.

[0014] Preferably, the thickness of the temperature sensing contact piece does not exceed 0.5 mm. More preferably, the thickness of the temperature sensing contact piece is 0.1 to 0.5 mm. More preferably, the length and width of the temperature sensing contact piece are both 3 to 5 mm.

[0015] Preferably, one end of the temperature collection line is welded to the temperature collection contact piece. Preferably, the surface of the temperature collection line is wrapped with an acid-proof epoxy resin layer. The welding point between the temperature collection line and the temperature collection contact piece is also wrapped with an epoxy resin layer to prevent corrosion of the welding point by sulfuric acid electrolyte.

[0016] Preferably, a through hole for the temperature collection line to extend out is provided on the side of the battery container between the positive and negative ears, and the through hole is sealed with hot melt adhesive after assembly. The temperature collection line passes through the side wall of the battery container, which does not affect the battery cover buckle, casting welding, and acid addition operations, and is conducive to the collection of the temperature changes of the plates during the whole process of battery acid addition and formation.

[0017] Preferably, the battery slot is divided into 6 cells, each cell is arranged in a straight line, and the 6 cells are numbered 1 to 6 from one end to the other, so that cells 1 and 6 are a group, cells 2 and 5 are a group, and cells 3 and 4 are a group, and a temperature sensing contact piece is provided in one of the cells in each group.

[0018] The lead-acid battery structure for formation of the utility model uses a thermocouple for temperature measurement, but the temperature collection line used for temperature measurement using the thermocouple alone cannot be effectively fixed. By placing a temperature collection contact piece on the surface of one of the pole plates of the pole group and assembling it into the battery slot together with the pole plate, the stability and accuracy of the collected temperature are ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The utility model is a schematic diagram of the structure of a lead-acid battery used for formation.

[0020] Figure 2 This is a schematic diagram of the location where the temperature collection line passes through the battery slot.

[0021] Reference numerals: battery slot 1, pole plate 2, partition 3, pole ear 4, bus bar 5, temperature collection contact piece 6, temperature collector 7, temperature collection line 8. DETAILED DESCRIPTION

[0022] like Figure 1 and 2 As shown, a lead-acid battery structure for formation is used to monitor the internal temperature of the lead-acid battery during the formation process. A battery of the same model as the lead-acid battery to be monitored is used, but a temperature collection mechanism is pre-set during the assembly process of the battery, and the formation is carried out according to the same formation process, so that the internal temperature change of the same model battery during the formation process can be accurately understood.

[0023] The lead-acid battery structure used in the present application includes a battery tank 1 and a battery cover. The battery cover uses an existing conventional structure in the present application, so it is not repeated here. The inner cavity of the battery tank 1 is divided into a plurality of single cells, each of which is not provided with a pole group. The pole group includes a pole plate 2, which is divided into a positive plate and a negative plate. The positive plate and the negative plate are separated by a partition 3. The top surface of the pole plate 2 has a pole ear 4, wherein the top surface of the positive plate is a positive pole ear, and the top surface of the negative plate is a negative pole ear, and the positive pole ear and the negative pole ear are each located on one side in the pole group. The pole ears of the same polarity in the same pole group are connected in series by a bus 5.

[0024] The lead-acid battery structure for formation of the present application further comprises a temperature collection mechanism, which comprises a temperature collection contact piece 6 , a temperature collection instrument 7 and a temperature collection line 8 .

[0025] The temperature sensing contact piece 6 is placed on the surface of one of the pole plates 2 of the pole group and assembled into the battery slot 1 together with the pole plate 2. The material of the temperature sensing contact piece 6 is preferably pure lead. The thickness of the temperature sensing contact piece 6 does not exceed 0.5 mm. If the thickness of the temperature sensing contact piece 6 is too thick, it will affect the stacking of the pole plates 2 and the assembly of the pole group into the slot, so it should not be too thick. Of course, setting it too thin is not conducive to assembly and testing. The thickness of the temperature sensing contact piece 6 is preferably 0.1-0.5 mm. The length and width of the temperature sensing contact piece 6 are both 3-5 mm.

[0026] The temperature collection line 8 has two conductors forming a thermocouple temperature measurement structure. The temperature collection line 8 passes through the battery slot 1, one end of which is connected to the temperature collection contact piece 6, and the other end is connected to the temperature collector 7. One end of the temperature collection line 8 is welded to the temperature collection contact piece 6. The surface of the temperature collection line 8 is wrapped with an acid-proof epoxy resin layer. The welding point between the temperature collection line 8 and the temperature collection contact piece 6 is also wrapped with an epoxy resin layer to prevent the sulfuric acid electrolyte from corroding the welding point.

[0027] The temperature collector 7 is used to collect the temperature from the temperature collection line 8. The temperature collector 7 can use the existing conventional structure of the temperature collector, which can be purchased directly. The purchased temperature collector 7 comes with two kinds of wires of the temperature collection line 8 for forming a thermocouple temperature measurement structure. You only need to prepare the temperature collection contact piece 6 by yourself, and weld one end of the temperature collection line 8 for temperature measurement to the temperature collection contact piece 6, and then wrap it with an epoxy resin layer.

[0028] A through hole for the temperature collection line 8 to extend out is provided on the side of the battery container 1 between the positive and negative ears. After assembly, the through hole is sealed with hot melt adhesive. The temperature collection line 8 passes through the side wall of the battery container 1, which does not affect the battery cover buckle, casting welding, and acid addition operations, and is conducive to the collection of the temperature changes of the plates during the whole process of battery acid addition and formation.

[0029] In a preferred embodiment, the battery slot 1 is divided into 6 cells, each cell is arranged in a straight line, and the 6 cells are numbered from one end to the other as 1 to 6, then cells 1 and 6 form a group, cells 2 and 5 form a group, cells 3 and 4 form a group, and a temperature sensing contact piece 6 is provided in one of the cells in each group. Generally speaking, it is not easy for the cells near the middle to dissipate heat after heating, while the cells located on the side are easy to dissipate heat. After grouping in the above manner, the heat dissipation ease of cells in the same group is similar, while the heat dissipation ease of cells in different groups is different. Therefore, a temperature sensing contact piece 6 is provided in a cell in the same group, so that the temperature conditions at different positions inside the battery can be more precisely monitored.

Claims

1. A lead-acid battery structure for formation, comprising a battery tank and a battery cover, wherein the inner cavity of the battery tank is divided into a plurality of cells, each cell is not provided with a pole group, the pole group comprises a pole plate, the pole plate is divided into a positive pole plate and a negative pole plate, the top surface of the pole plate has a pole ear, the pole ears of the same polarity in the same pole group are connected in series by a bus, characterized in that: The lead-acid battery structure for formation further includes a temperature collection mechanism, which includes: The temperature sensing contact piece is placed on the surface of one of the plates of the pole group and assembled into the battery slot together with the plate; A temperature collection line, having two conductors forming a thermocouple temperature measurement structure, the temperature collection line passes through the battery slot, one end of the temperature collection line is connected to the temperature collection contact piece, and the other end is connected to the temperature collection instrument; The temperature collector is used to collect the temperature from the temperature collection line.

2. The lead-acid battery structure for formation according to claim 1, characterized in that: The material of the temperature sensing contact piece is pure lead.

3. The lead-acid battery structure for formation according to claim 1, characterized in that: The thickness of the temperature sensing contact piece does not exceed 0.5 mm.

4. The lead-acid battery structure for formation according to claim 3, characterized in that: The thickness of the temperature collecting contact piece is 0.1-0.5 mm.

5. The lead-acid battery structure for formation according to claim 3, characterized in that: The length and width of the temperature sensing contact piece are both 3-5 mm.

6. The lead-acid battery structure for formation according to claim 1, characterized in that: One end of the temperature collection line is welded to the temperature collection contact piece.

7. The lead-acid battery structure for formation according to claim 1, characterized in that: The surface of the temperature collection line is wrapped with an acid-proof epoxy resin layer.

8. The lead-acid battery structure for formation according to claim 1, characterized in that: A through hole for the temperature collection line to extend out is provided on the side of the battery container between the positive electrode ear and the negative electrode ear. After assembly, the through hole is sealed with hot melt adhesive.

9. The lead-acid battery structure for formation according to claim 1, characterized in that: The battery slot is divided into 6 cells, each cell is arranged in a straight line, and the 6 cells are numbered 1 to 6 from one end to the other, so cells 1 and 6 are a group, cells 2 and 5 are a group, and cells 3 and 4 are a group. A temperature sensing contact is provided in one of the cells in each group.

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