Power storage battery capable of preventing failure

Abstract

The invention belongs to the technical field of power storage batteries, and particularly relates to a power storage battery capable of preventing failure. Comprising a battery jar, the battery jar is filled with electrolyte, a pole group is arranged in the battery jar, an insulation anti-deformation support is arranged between the pole group and the battery jar, the pole group comprises a positive plate and a negative plate, pole columns are arranged on the positive plate and the negative plate, the pole columns are copper core bodies, lead coating layers are arranged outside the pole columns, and the lead coating layers cover the connecting portions of the pole columns and the pole group. The binding agent is coated at the joint of the post terminal and the lead coating layer after the post terminal is cast; the electrolyte is prepared from the following raw materials in percentage by mass: 93.5 to 94.5 percent of sulfuric acid solution; 3.5% to 5% of glucomannan gum; and 1%-2% of a suspending agent. The method can effectively avoid early termination of the service life of the battery due to deformation of the pole group under external force.

Description

Technical Field

[0001] The present invention belongs to the technical field of power batteries, and in particular relates to a power battery capable of preventing failure. Background Art

[0002] In the field of batteries, 2 / 3 / 4DB and 2 / 3 / 4PzS power batteries are widely used in various electronic devices and energy storage systems due to their high energy density and long cycle life. However, these batteries face a series of technical challenges during assembly and use, especially in terms of the mechanical stability and electrochemical performance of the battery. During the assembly and use of the battery, it is necessary to use an electric threading wrench to tighten the battery many times. When the number of plates is relatively small, the copper core, the external lead layer and the upper part of the pole group are all subject to a certain external force when the pole terminal is put on the line. After multiple on-line and off-line operations, the pole terminal will be loose. The pole group inside the battery will deform due to frequent mechanical stress. One consequence of the deformation of the pole group is the deflection of the plate. At the same time, since the plate will expand to a certain thickness during the use of the battery, this expansion will aggravate the deformation of the plate, and eventually cause the plate to directly puncture the partition. The partition is a key component used to isolate the positive and negative electrodes inside the battery. Once punctured, it will cause a short circuit problem inside the battery, causing the battery to fail prematurely and cannot be used normally. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a power storage battery that prevents failure, which can effectively avoid the premature termination of battery life due to deformation of the pole group due to external forces.

[0004] The power storage battery for preventing failure of the present invention comprises a battery tank, wherein the battery tank is filled with electrolyte, a pole group is arranged in the battery tank, an insulating anti-deformation bracket is arranged between the pole group and the battery tank, the pole group comprises a positive plate and a negative plate, poles are arranged on the positive plate and the negative plate, the poles are copper core bodies, a lead coating is arranged on the outside of the poles, the lead coating covers the connection between the poles and the pole group, and an adhesive is applied at the junction of the poles and the lead coating after the poles are cast; The electrolyte is composed of the following raw materials in mass fractions: Sulfuric acid solution, 93.5%-94.5%; Glucomannan, 3.5%-5%; Suspension, 1%-2%.

[0005] Before filling the electrolyte, it needs to be fully stirred with a disperser and stirred for 20 minutes before it can be poured into the battery.

[0006] Preferably, the mass fraction of sulfuric acid in the sulfuric acid solution is 37.9%-39.1%.

[0007] Preferably, the suspending agent is hydroxypropyl methylcellulose.

[0008] Preferably, the adhesive is epoxy resin glue, and the adhesive is applied as follows: after the surface of the junction between the pole and the lead coating is cleaned, the adhesive is applied to the surface of the junction and cured to form a stronger bonding force between the pole and the lead coating.

[0009] Preferably, a bus is provided on the pole group, the insulating anti-deformation bracket is a hollow structure with an opening on the top, the size of the opening is adapted to the size of the pole, and the insulating anti-deformation bracket is mounted on the outside of the pole group and fits against the inner wall of the battery slot; when mounted, the opening passes through the pole.

[0010] Preferably, the insulating anti-deformation bracket is snap-connected to the outside of the pole group.

[0011] Preferably, the insulating anti-deformation bracket is made of ABS material.

[0012] Preferably, the insulating anti-deformation bracket is integrally formed of ABS and has a thickness of 18-20 mm.

[0013] Preferably, the electrolyte density is 1.288-1.295 g / cm 3 .

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. Adhesive is added to the lead liquid to form a tightly fused structure between the pole and the lead layer, so that the copper core of the pole is not easy to fall off under external force, avoiding the problem of wire slippage during the online process; adding glucomannan to the electrolyte can make the battery electrolyte solid at room temperature, reducing the damage to the pole group caused by external force; adding suspending agent can increase the viscosity of the electrolyte, and avoid the deposition or agglomeration of microparticles contained in glucomannan under cyclic use, so that it can be more evenly distributed inside the battery to prevent stratification problems, which can ensure that the battery capacity is not affected by changes in the acid state and achieve maintenance-free use. 2. The insulation anti-deformation bracket is made of ABS, which has good strength and heat resistance. It passes through the pole and is mounted on the pole group to form a supporting and fastening structure; 3. The battery of the present invention can form a relatively stable structure during the online process, avoiding the problem of short circuit caused by deformation of the pole group due to excessive torque or long-term and multiple cycles. At the same time, it can effectively prevent the premature termination of the life of small-capacity batteries due to deformation, thereby extending the service life of the battery while facilitating user use. DETAILED DESCRIPTION

[0015] The technical solution of the present invention will be clearly and completely described below in conjunction with embodiments.

[0016] Unless otherwise specified, all raw materials used in the examples are commercially available.

[0017] Example 1 The failure-preventing power storage battery has a battery model of 3DB210, including a battery slot filled with an electrolyte. A pole group is arranged in the battery slot, and the pole group includes a positive plate and a negative plate. Both the positive plate and the negative plate are provided with poles, and the poles have an outer diameter of 25 mm and a height of 70 mm. The poles are copper core bodies with hot-dip tin on the surface. A lead coating is arranged on the outside of the copper core body, and the lead coating covers the connection between the pole and the pole group. After the pole is cast, an adhesive is applied at the junction of the pole and the lead coating.

[0018] The electrolyte is composed of the following raw materials in mass fractions: Sulfuric acid solution, 93.5%; Glucomannan, 5%; Suspension concentrate, 1.5%.

[0019] The mass fraction of sulfuric acid in the sulfuric acid solution is 37.9%; The electrolyte density is 1.288g / cm 3 ; The suspending agent is hydroxypropyl methylcellulose; The adhesive is epoxy resin glue. The method of applying the adhesive is as follows: after the surface of the joint between the pole and the lead coating is cleaned, the adhesive is applied to the surface of the joint and solidified.

[0020] Before filling the electrolyte, it needs to be fully stirred with a disperser and stirred for 20 minutes before it can be poured into the battery.

[0021] The pole group is provided with a busbar, and an insulating anti-deformation bracket is provided between the pole group and the battery slot. The insulating anti-deformation bracket is a hollow structure with an opening at the top. The size of the opening matches the size of the pole. The insulating anti-deformation bracket is sleeved on the outside of the pole group and fits the inner wall of the battery slot. When sleeved, the opening passes through the pole. The insulating anti-deformation bracket is snapped with the outside of the pole group.

[0022] The insulated anti-deformation bracket is made of ABS in one piece and has a thickness of 18mm.

[0023] Example 2 The failure-preventing power storage battery has a battery model of 3DB210, including a battery slot filled with an electrolyte. A pole group is arranged in the battery slot, and the pole group includes a positive plate and a negative plate. Both the positive plate and the negative plate are provided with poles, and the poles have an outer diameter of 25 mm and a height of 70 mm. The poles are copper core bodies with hot-dip tin on the surface. A lead coating is arranged on the outside of the copper core body, and the lead coating covers the connection between the pole and the pole group. After the pole is cast, an adhesive is applied at the junction of the pole and the lead coating.

[0024] The electrolyte is composed of the following raw materials in mass fractions: Sulfuric acid solution, 94.3%; Glucomannan, 4.7%; Suspension concentrate, 1%.

[0025] The mass fraction of sulfuric acid in the sulfuric acid solution is 38.5%; The electrolyte density is 1.290g / cm 3 ; The suspending agent is hydroxypropyl methylcellulose; The adhesive is epoxy resin glue. The method of applying the adhesive is as follows: after the surface of the joint between the pole and the lead coating is cleaned, the adhesive is applied to the surface of the joint and solidified.

[0026] Before filling the electrolyte, it needs to be fully stirred with a disperser and stirred for 20 minutes before it can be poured into the battery.

[0027] The pole group is provided with a busbar, and an insulating anti-deformation bracket is provided between the pole group and the battery slot. The insulating anti-deformation bracket is a hollow structure with an opening at the top. The size of the opening matches the size of the pole. The insulating anti-deformation bracket is sleeved on the outside of the pole group and fits the inner wall of the battery slot. When sleeved, the opening passes through the pole. The insulating anti-deformation bracket is snapped with the outside of the pole group.

[0028] The insulated anti-deformation bracket is made of ABS in one piece and has a thickness of 19mm.

[0029] Example 3 The failure-preventing power storage battery has a battery model of 3DB210, including a battery slot filled with an electrolyte. A pole group is arranged in the battery slot, and the pole group includes a positive plate and a negative plate. Both the positive plate and the negative plate are provided with poles, and the poles have an outer diameter of 25 mm and a height of 70 mm. The poles are copper core bodies with hot-dip tin on the surface. A lead coating is arranged on the outside of the copper core body, and the lead coating covers the connection between the pole and the pole group. After the pole is cast, an adhesive is applied at the junction of the pole and the lead coating.

[0030] The electrolyte is composed of the following raw materials in mass fractions: Sulfuric acid solution, 94.5%; Glucomannan, 3.5%; Suspension concentrate, 2%.

[0031] The mass fraction of sulfuric acid in the sulfuric acid solution is 39.1%; The electrolyte density is 1.295g / cm 3 ; The suspending agent is hydroxypropyl methylcellulose; The adhesive is epoxy resin glue. The method of applying the adhesive is as follows: after the surface of the joint between the pole and the lead coating is cleaned, the adhesive is applied to the surface of the joint and solidified.

[0032] Before filling the electrolyte, it needs to be fully stirred with a disperser and stirred for 20 minutes before it can be poured into the battery.

[0033] The pole group is provided with a busbar, and an insulating anti-deformation bracket is provided between the pole group and the battery slot. The insulating anti-deformation bracket is a hollow structure with an opening at the top. The size of the opening matches the size of the pole. The insulating anti-deformation bracket is sleeved on the outside of the pole group and fits the inner wall of the battery slot. When sleeved, the opening passes through the pole. The insulating anti-deformation bracket is snapped with the outside of the pole group.

[0034] The insulated anti-deformation bracket is made of ABS in one piece and has a thickness of 20mm.

[0035] Comparative Example 1 The difference between this comparative example 1 and example 1 is that no insulating anti-deformation bracket is provided between the pole group and the battery cell.

[0036] Comparative Example 2 The difference between Comparative Example 2 and Example 2 is that no adhesive is applied at the junction of the pole and the lead coating.

[0037] Comparative Example 3 The difference between this comparative example 3 and example 3 is that no glucomannan and suspending agent are added to the electrolyte, and the electrolyte density is 1.290 g / cm 3 .

[0038] Performance Testing Examples 1-3 and Comparative Examples 1-3 were tested for cycle durability and user usage time.

[0039] Among them, the cycle endurance is tested in accordance with GB / T7403.1-2018 "Lead-acid Batteries for Traction Part 1: Technical Conditions", and the test is carried out according to 6.5, and the number of cycles completed when the rated capacity is 80% is recorded; User usage time: The assembled batteries of Example 1-3 and Comparative Example 1-3 were assembled into a power supply device and used in a 1.5t forklift in a forklift workshop. Under the working condition of 4 hours per day, the usage time from the start of use to the battery failure was recorded (in months). The results are shown in Table 1.

[0040] Table 1 Cyclic durability and user use time test table of Examples 1-3 and Comparative Examples 1-3

[0041] Compared with Example 1, Comparative Example 1 does not use an insulating anti-deformation bracket. During the cycle of the battery, the electrolyte is in a solidified state, but after long-term use, the solidification of the electrolyte will decrease, and the pole group force does not have a strong enough support point, resulting in pole group deviation, resulting in the contact between the positive and negative poles to form a short circuit point, and the battery fails prematurely. When the cycle endurance test was carried out in the test room, the battery was tightened relatively less frequently, and the charge and discharge current was relatively small, and the number of tests could be 600 times; during the user's use, affected by the working conditions, the battery discharge current was large, and there was a certain vibration, so the battery was tightened relatively frequently during use, and the use time was short, only 11 months.

[0042] In the continuous operation of Example 2, the pole became loose due to the poor bonding between the copper core and the lead, and the charging amount was severely reduced during the charging process. Affected by the working conditions, the user's usage time declined rapidly.

[0043] The electrolyte composition of Comparative Example 3 is only 1.290 g / cm 3 When the electrolyte is a sulfuric acid solution with a density of 1.54 W, the upper part of the electrolyte cannot solidify. After repeated online operations, the anti-deformation device will deform to a certain extent. The pole group will still deform after being subjected to force, and the battery will fail prematurely before the warranty period.

Claims

1. A power storage battery for preventing failure, comprising a battery tank filled with electrolyte, a pole group arranged in the battery tank, an insulating anti-deformation bracket arranged between the pole group and the battery tank, the pole group comprising a positive plate and a negative plate, and poles are arranged on the positive plate and the negative plate, characterized in that: The pole is a copper core body, and a lead layer is provided on the outside of the pole, which covers the connection between the pole and the pole group. After the pole is cast, an adhesive is applied to the connection between the pole and the lead layer. The electrolyte is composed of the following raw materials in mass fractions: Sulfuric acid solution, 93.5%-94.5%; Glucomannan, 3.5%-5%; Suspension, 1%-2%.

2. The failure-preventing power storage battery according to claim 1, characterized in that: The mass fraction of sulfuric acid in the sulfuric acid solution is 37.9%-39.1%.

3. The failure-preventable power storage battery according to claim 1, characterized in that: The suspending agent is hydroxypropyl methylcellulose.

4. The failure-preventable power storage battery according to claim 1, characterized in that: The adhesive is epoxy resin glue. The method of applying the adhesive is as follows: after the surface of the joint between the pole and the lead coating is cleaned, the adhesive is applied to the surface of the joint and solidified.

5. The failure-preventable power storage battery according to claim 1, characterized in that: A bus is provided on the pole group. The insulating anti-deformation bracket is a hollow structure with an opening on the top. The size of the opening is adapted to the size of the pole. The insulating anti-deformation bracket is mounted on the outside of the pole group and fits against the inner wall of the battery slot. When mounted, the opening passes through the pole.

6. The failure-preventable power storage battery according to claim 5, characterized in that: The insulating anti-deformation bracket is snap-connected with the outside of the pole group.

7. The failure-preventable power storage battery according to claim 5, characterized in that: The insulating anti-deformation bracket is made of ABS material.

8. The failure-preventable power storage battery according to claim 5, characterized in that: The insulated anti-deformation bracket is made of ABS in one piece with a thickness of 18-20mm.

9. The failure-preventable power storage battery according to claim 1, characterized in that: The electrolyte density is 1.288-1.295g / cm 3 .

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