Preventing failure of a power storage battery

Abstract

The application belongs to the technical field of power storage batteries, and particularly relates to a power storage battery capable of preventing failure. The power storage battery comprises a battery tank, the battery tank is filled with electrolyte, an electrode group is arranged in the battery tank, an insulating anti-deformation support is arranged between the electrode group and the battery tank, the electrode group comprises positive plates and negative plates, a pole is arranged on each of the positive plates and the negative plates, the pole is a copper core, a lead coating layer is arranged outside the pole, the lead coating layer covers the pole and a connecting part of the electrode group, and an adhesive is coated on a joint between the pole and the lead coating layer after the pole is cast. The electrolyte is composed of the following raw materials in mass fraction: sulfuric acid solution, 93.5%-94.5%; glucomannan, 3.5%-5%; and suspending agent, 1%-2%. The application can effectively avoid the deformation of the electrode group caused by external force, and finally lead to the premature termination of the service life of the battery.

Description

Technical Field

[0001] This invention belongs to the field of power battery technology, specifically relating to power batteries that prevent failure. Background Technology

[0002] In the battery field, 2 / 3 / 4DB and 2 / 3 / 4PzS type 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 mechanical stability and electrochemical performance. During assembly and use, the battery requires repeated tightening with an electric wire tightening wrench. When the number of plates is relatively small, the copper core, the outer lead cladding, and the upper part of the electrode group are all subjected to external forces during wire tightening. After repeated tightening and loosening operations, the electrode terminals may become loose. The electrode group inside the battery will deform due to frequent mechanical stress, resulting in plate misalignment. Simultaneously, the plates expand to a certain thickness during battery use, which exacerbates plate deformation, eventually causing the plates to puncture the separator. The separator is a critical component inside the battery used to isolate the positive and negative electrodes; once punctured, it will cause a short circuit inside the battery, leading to premature battery failure and rendering it unusable. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides a power battery designed to prevent failure, which can effectively prevent premature battery lifespan termination due to deformation of the electrode groups caused by external forces.

[0004] The power battery for preventing failure according to the present invention includes a battery case filled with electrolyte, an electrode group arranged inside the battery case, and an insulating and deformation-resistant support between the electrode group and the battery case. The electrode group includes a positive electrode plate and a negative electrode plate, and a terminal post is provided on both the positive and negative electrode plates. The terminal post has a copper core and a lead cladding layer on the outside of the terminal post. The lead cladding layer covers the connection between the terminal post and the electrode group. After the terminal post is cast, an adhesive is applied to the joint between the terminal post and the lead cladding layer.

[0005] The electrolyte is composed of the following raw materials by mass fraction:

[0006] Sulfuric acid solution, 93.5%-94.5%;

[0007] Glucomannan, 3.5%-5%;

[0008] Suspension agent, 1%-2%.

[0009] Before filling with electrolyte, the mixture must be thoroughly stirred using a disperser for 20 minutes before filling the battery.

[0010] Preferably, the mass fraction of sulfuric acid in the sulfuric acid solution is 37.9%-39.1%.

[0011] Preferably, the suspending agent is hydroxypropyl methylcellulose.

[0012] Preferably, the adhesive is epoxy resin. The adhesive is applied by cleaning the surface of the junction between the electrode post and the lead cladding layer, then applying the adhesive to the junction surface and allowing it to cure, thereby forming a stronger adhesion between the electrode post and the lead cladding layer.

[0013] Preferably, the electrode group is provided with a busbar, and the insulating and anti-deformation bracket is a hollow structure with an opening at the top. The size of the opening is adapted to the size of the electrode post. The insulating and anti-deformation bracket is fitted onto the outside of the electrode group and fits against the inner wall of the battery compartment. When fitted, the opening passes through the electrode post.

[0014] Preferably, the insulating and deformation-resistant bracket is snapped into the outside of the pole group.

[0015] Preferably, the insulating and deformation-resistant bracket is made of ABS material.

[0016] Preferably, the insulating and deformation-resistant bracket is made of ABS in one piece with a thickness of 18-20mm.

[0017] Preferably, the electrolyte density is 1.288-1.295 g / cm³. 3 .

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. The lead solution contains a binder that forms a tight fusion between the electrode post and the lead-clad layer, making the copper core of the electrode post less likely to detach under external force and avoiding stripping issues during the wiring process; the addition of glucomannan to the electrolyte ensures that the electrolyte remains solidified at room temperature, reducing damage to the electrode group under external force; the addition of a suspending agent increases the viscosity of the electrolyte, preventing the deposition or agglomeration of microparticles contained in the glucomannan during cyclic use, ensuring more uniform distribution inside the battery and preventing stratification. This ensures that the battery capacity is not affected by changes in the acid state and achieves maintenance-free operation.

[0020] 2. The insulating and anti-deformation bracket is made of ABS, which has good strength and heat resistance. It passes through the pole and is fitted onto the pole group to form a support and fastening structure.

[0021] 3. The battery of this invention can form a better and more stable structure during the production process, avoiding short circuit problems caused by electrode deformation due to excessive torque or long-term repeated use. At the same time, it can effectively prevent small-capacity batteries from prematurely ending their lifespan due to deformation, thus extending the battery's lifespan while making it convenient for users. Detailed Implementation

[0022] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments.

[0023] Unless otherwise specified, all raw materials used in the examples were commercially available.

[0024] Example 1

[0025] The aforementioned power battery for preventing failure, battery model: 3DB210, includes a battery case filled with electrolyte. The battery case contains an electrode group, which includes a positive plate and a negative plate. Each positive and negative plate has a terminal post with an outer diameter of 25mm and a height of 70mm. The terminal post has a copper core with a hot-dip tin-plated surface. A lead-clad layer covers the connection between the terminal post and the electrode group. After the terminal post is cast, an adhesive is applied to the junction between the terminal post and the lead-clad layer.

[0026] The electrolyte is composed of the following raw materials by mass fraction:

[0027] Sulfuric acid solution, 93.5%;

[0028] Glucomannan, 5%;

[0029] Suspension agent, 1.5%.

[0030] The mass fraction of sulfuric acid in the sulfuric acid solution is 37.9%.

[0031] The electrolyte density is 1.288 g / cm³. 3 ;

[0032] The suspending agent is hydroxypropyl methylcellulose;

[0033] The adhesive is an epoxy resin adhesive. The adhesive is applied as follows: after cleaning the surface of the junction between the electrode post and the lead cladding layer, the adhesive is applied to the junction surface and cured.

[0034] Before filling with electrolyte, the mixture must be thoroughly stirred using a disperser for 20 minutes before filling the battery.

[0035] The electrode group is equipped with a busbar, and an insulating anti-deformation bracket is installed between the electrode group and the battery compartment. The insulating anti-deformation bracket has a hollow structure with an opening at the top, the size of which is adapted to the size of the electrode post. The insulating anti-deformation bracket is fitted onto the outside of the electrode group and fits snugly against the inner wall of the battery compartment; when fitted, the opening passes through the electrode post. The insulating anti-deformation bracket is snapped into place with the outside of the electrode group.

[0036] The insulated and deformation-resistant bracket is made of ABS in one piece with a thickness of 18mm.

[0037] Example 2

[0038] The aforementioned power battery for preventing failure, battery model: 3DB210, includes a battery case filled with electrolyte. The battery case contains an electrode group, which includes a positive plate and a negative plate. Each positive and negative plate has a terminal post with an outer diameter of 25mm and a height of 70mm. The terminal post has a copper core with a hot-dip tin-plated surface. A lead-clad layer covers the connection between the terminal post and the electrode group. After the terminal post is cast, an adhesive is applied to the junction between the terminal post and the lead-clad layer.

[0039] The electrolyte is composed of the following raw materials by mass fraction:

[0040] Sulfuric acid solution, 94.3%;

[0041] Glucomannan, 4.7%;

[0042] Suspension agent, 1%.

[0043] The mass fraction of sulfuric acid in the sulfuric acid solution is 38.5%.

[0044] The electrolyte density is 1.290 g / cm³. 3 ;

[0045] The suspending agent is hydroxypropyl methylcellulose;

[0046] The adhesive is an epoxy resin adhesive. The adhesive is applied as follows: after cleaning the surface of the junction between the electrode post and the lead cladding layer, the adhesive is applied to the junction surface and cured.

[0047] Before filling with electrolyte, the mixture must be thoroughly stirred using a disperser for 20 minutes before filling the battery.

[0048] The electrode group is equipped with a busbar, and an insulating anti-deformation bracket is installed between the electrode group and the battery compartment. The insulating anti-deformation bracket has a hollow structure with an opening at the top, the size of which is adapted to the size of the electrode post. The insulating anti-deformation bracket is fitted onto the outside of the electrode group and fits snugly against the inner wall of the battery compartment; when fitted, the opening passes through the electrode post. The insulating anti-deformation bracket is snapped into place with the outside of the electrode group.

[0049] The insulated and deformation-resistant bracket is made of ABS in one piece with a thickness of 19mm.

[0050] Example 3

[0051] The aforementioned power battery for preventing failure, battery model: 3DB210, includes a battery case filled with electrolyte. The battery case contains an electrode group, which includes a positive plate and a negative plate. Each positive and negative plate has a terminal post with an outer diameter of 25mm and a height of 70mm. The terminal post has a copper core with a hot-dip tin-plated surface. A lead-clad layer covers the connection between the terminal post and the electrode group. After the terminal post is cast, an adhesive is applied to the junction between the terminal post and the lead-clad layer.

[0052] The electrolyte is composed of the following raw materials by mass fraction:

[0053] Sulfuric acid solution, 94.5%;

[0054] Glucomannan, 3.5%;

[0055] Suspension agent, 2%.

[0056] The mass fraction of sulfuric acid in the sulfuric acid solution is 39.1%.

[0057] The electrolyte density is 1.295 g / cm³. 3 ;

[0058] The suspending agent is hydroxypropyl methylcellulose;

[0059] The adhesive is an epoxy resin adhesive. The adhesive is applied as follows: after cleaning the surface of the junction between the electrode post and the lead cladding layer, the adhesive is applied to the junction surface and cured.

[0060] Before filling with electrolyte, the mixture must be thoroughly stirred using a disperser for 20 minutes before filling the battery.

[0061] The electrode group is equipped with a busbar, and an insulating anti-deformation bracket is installed between the electrode group and the battery compartment. The insulating anti-deformation bracket has a hollow structure with an opening at the top, the size of which is adapted to the size of the electrode post. The insulating anti-deformation bracket is fitted onto the outside of the electrode group and fits snugly against the inner wall of the battery compartment; when fitted, the opening passes through the electrode post. The insulating anti-deformation bracket is snapped into place with the outside of the electrode group.

[0062] The insulated and deformation-resistant bracket is made of ABS in one piece with a thickness of 20mm.

[0063] Comparative Example 1

[0064] The difference between Comparative Example 1 and Example 1 is that no insulating anti-deformation bracket is provided between the electrode group and the battery compartment.

[0065] Comparative Example 2

[0066] The difference between Comparative Example 2 and Example 2 is that no adhesive was applied at the junction of the electrode post and the lead cladding layer.

[0067] Comparative Example 3

[0068] The difference between Comparative Example 3 and Example 3 is that no glucomannan or suspending agent was added to the electrolyte, and the electrolyte density was 1.290 g / cm³. 3 .

[0069] Performance testing

[0070] Examples 1-3 and Comparative Examples 1-3 were subjected to cycle durability and user usage time tests.

[0071] Among them, the cycle durability is tested in accordance with GB / T7403.1-2018 "Traction Lead-acid Batteries 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.

[0072] User usage time: The batteries assembled in Examples 1-3 and Comparative Examples 1-3 were combined into a power unit and used with a 1.5t forklift in the forklift workshop. Under the condition of 4 hours of operation per day, the usage time from the start of use to battery failure was recorded (in months). The results are shown in Table 1.

[0073] Table 1. Cyclic durability and user usage time test results for Examples 1-3 and Comparative Examples 1-3

[0074]

[0075] Compared to Example 1, Comparative Example 1 did not employ an insulating anti-deformation support. During cyclic use, although the electrolyte remained in a solidified state, its density decreased over time. The electrode group lacked sufficient support, leading to electrode misalignment and short circuits between the positive and negative electrodes, causing premature battery failure. In the testing laboratory, the battery underwent relatively fewer tightening cycles and the charge / discharge current was relatively low, resulting in up to 600 tests. However, during user use, due to operating conditions, the battery discharge current was higher, and vibrations were present. Therefore, the number of tightening cycles was relatively higher, and the usage time was shorter, only 11 months.

[0076] In Comparative Example 2, during continuous operation, the copper core and lead were not properly bonded, causing the electrode to loosen. This resulted in a significant reduction in the charging amount during the charging process, and the user's usage time decreased rapidly due to the influence of the operating conditions.

[0077] The electrolyte composition of Comparative Example 3 was only 1.290 g / cm³. 3 When the electrolyte is a sulfuric acid solution with a high density, the upper part of the electrolyte cannot solidify. After repeated online operation, the anti-deformation device will undergo certain deformation. The electrode group will still deform under stress, and the battery will fail prematurely before the warranty period.

Claims

1. A failure-preventing power storage battery comprising a battery tank filled with an electrolyte, a pole group provided in the battery tank, an insulating deformation-preventing support provided between the pole group and the battery tank, the pole group comprising a positive plate and a negative plate, and a pole provided on each of the positive plate and the negative plate, characterized in that, The pole column is a copper core, and a lead wrapping layer is arranged outside the pole column, covering the pole column and the connecting part of the pole group. The electrolyte is composed of the following raw materials in mass fraction: Sulfuric acid solution, 93.5%-94.5%; Glucomannan, 3.5%-5%; Suspension agent, 1%-2%; The suspension agent is hydroxypropyl methyl cellulose; The pole group is provided with a bus bar, and the insulating anti-deformation support is a hollow structure, and is provided with an opening at the upper portion, the size of the opening is matched with the size of the pole column, and the insulating anti-deformation support is sleeved outside the pole group and is attached to the inner wall of the battery tank; when sleeving, the opening passes through the pole column; The insulating anti-deformation support is clamped with the outside of the pole group; The adhesive is epoxy resin glue, and the adhesive is applied to the surface of the connecting part after surface cleaning.

2. The failure-preventing power accumulator 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-preventing power accumulator according to claim 1, characterized in that The insulating anti-deformation support is made of ABS material.

4. The failure-preventing power accumulator according to claim 1, characterized in that The insulating anti-deformation support is integrally formed by ABS, and the thickness is 18-20 mm.

5. The failure-preventing power accumulator according to claim 1, characterized in that Electrolyte density is 1.288-1.295 g / cm 3 .

Images