CN218297934U

CN218297934U - System for detecting electrolyte wettability of storage battery

Info

Publication number: CN218297934U
Application number: CN202221077279.XU
Authority: CN
Inventors: 曾士哲
Original assignee: Weilai Automobile Technology Anhui Co Ltd
Current assignee: Weilai Automobile Technology Anhui Co Ltd
Priority date: 2022-05-07
Filing date: 2022-05-07
Publication date: 2023-01-13
Anticipated expiration: 2032-05-07

Abstract

The application discloses a system for detecting electrolyte infiltration nature of battery, it includes: a first container for containing a battery and an electrolyte to be tested; a measuring device configured to sense a change in weight of the battery over a wetting time period; a suction device arranged in connection with the first container to suck air from the first container; a heating device configured to heat the first container; and a data output device configured to be communicatively coupled to the measurement device. The system can accurately reflect the electrolyte wettability of the battery.

Description

System for detecting electrolyte wettability of storage battery

Technical Field

The application relates to the field of storage battery manufacturing, in particular to a system for detecting electrolyte wettability of a storage battery.

Background

The lithium ion battery is one of ideal power sources of the electric automobile, and with the rapid development of the new energy automobile market, the material system, the structural design and the process technology of the lithium ion battery are also rapidly updated and upgraded.

Lithium ion batteries are made up of a plurality of electrochemical cells arranged in an arrangement wherein each electrochemical cell consists essentially of a positive electrode, a negative electrode, a separator, and an electrolyte. In the production and manufacturing process of the lithium ion battery, the amount of electrolyte injection and the infiltration degree of the electrolyte are related to the capacity of each electrochemical battery cell, so the infiltration of the electrolyte further represents the internal capacity, the cyclicity and other performances of the storage battery. The battery needs to be statically activated after being injected, the main purpose is to allow the electrolyte to fully infiltrate the battery core, the currently mainstream static activation time is between 36 and 72 hours, the temperature is set between 25 ℃ or 8 and 24 hours, the temperature is set at 45 ℃, and the parameters are mostly established according to experience. For different material systems and process designs, proper standing activation conditions are selected, and the determination of the time (soaking speed) for full soaking of the electrolyte and the soaking amount is very important.

The experimental device for quantitative test electrolyte infiltration nature that prior art relates includes and is connected the support that constitutes by crossbeam and perpendicular roof beam, is provided with the sealed bottle that the splendid attire was awaited measuring electrolyte in the support, and the top of sealed bottle is equipped with sealing mechanism, and sealed bottle embeds has the battery pole piece of the electrolyte infiltration nature of awaiting measuring, battery pole piece passes sealing mechanism's no elastic rope through one and connects on the support of sealed bottle top. The device also comprises a balance device for measuring the weight change of the battery pole piece.

The device can measure the electrolyte infiltration amount and infiltration speed in the pole piece, but in the actual production process, some additional conditions are often set during the electrolyte infiltration (namely, activation and standing): for example, the temperature, the vacuum degree and the like, and the infiltration amount and the infiltration time of the actual battery cell are often influenced by the tightness of the pole piece assembly, and the estimation error of the infiltration amount and the infiltration speed of the electrolyte in the actual battery cell by adopting the method is large.

SUMMERY OF THE UTILITY MODEL

One aspect of the application relates to a system for detecting the electrolyte wettability of a storage battery, which comprises a first container, a second container and a third container, wherein the first container is used for accommodating the storage battery to be detected and the electrolyte; a measuring device configured to sense a change in weight of the battery over a wetting time period; a suction device arranged in connection with the first container to suck air from the first container; a heating device configured to heat the first container; and a data output device configured to be communicatively coupled to the measurement device.

In an embodiment of the system for detecting the wettability of an electrolyte of a battery, the first container is arranged to house the measuring device and a winding core of the battery.

In an embodiment of the system for detecting the wettability of an electrolyte of a battery, the measuring device is arranged to suspend the winding core of the battery by a string from the bottom of the measuring device.

In an embodiment of the system for detecting electrolyte wetting of a battery, the first container has an opening for allowing the battery to enter the first container, the opening being arranged to be sealable.

In one embodiment of the system for detecting the electrolyte wettability of a storage battery, a support is arranged inside the first container to support the measuring device, and the measuring device comprises an electronic balance.

In an embodiment of the system for detecting the wettability of the electrolyte of the storage battery, the system further comprises a second container containing a heating medium, and the first container is in the second container, so that the heating device heats the first container by heating the heating medium.

In one embodiment of the system for detecting the wettability of an electrolyte of a storage battery, the heating device includes a heating rod disposed in the heating medium and a stirrer for flowing the heating medium.

In one embodiment of the system for detecting the electrolyte wettability of a storage battery, the suction device comprises a pump and a valve, the pump is connected with the first container through a pipeline, and the valve is arranged on the pipeline between the pump and the first container.

In one embodiment of the system for detecting the electrolyte wettability of a battery, the volume of the second container is set such that the level of the heating medium therein is higher than the level of the electrolyte in the first container.

In one embodiment of the system for detecting the electrolyte wettability of a storage battery, the data output device is further in communication with at least one of the suction device and the heating device.

The system can accurately reflect the electrolyte wettability of the battery. The system of the application simulates the conditions of an infiltration experiment through a suction device, a heating device, a measuring device, and a first container, wherein the suction device and the heating device are respectively operated to control the vacuum degree and the temperature of the first container, thereby providing stable condition parameter values for the detection system. The experimental value can be known in real time through the data output device. The battery testing method and the battery testing device are suitable for testing battery schemes with various different designs, and because the experimental conditions and the experimental states of the batteries can be controlled and obtained at the first time, the experimental conditions do not need to be set according to experience, and the accuracy of the experimental results is guaranteed.

This application carries out the infiltration experiment to the book core of battery. The reeling core is suspended on a measuring device and sealed together with the measuring device in a first container. The core does not need to be clamped in the experiment process, so that the experiment result can not be mixed with errors caused by operation reasons.

The first container is arranged in the second container, and can be stably heated by the heating device through the heating medium in the second container, so that the battery to be detected in the first container can be ensured to be subjected to a wettability test at a set temperature.

Except for the data provided by the measuring device, the system can know the vacuum degree data, the electrolyte temperature and the experiment time in real time in the experiment process.

Other aspects and features of the present application will become apparent from the following detailed description, which proceeds with reference to the accompanying drawings. It is to be understood, however, that the drawings are designed solely for purposes of illustration and not as a definition of the limits of the application, for which reference should be made to the appended claims. It should be further understood that the drawings are merely intended to conceptually illustrate the structures and procedures described herein, and that, unless otherwise indicated, the drawings are not necessarily drawn to scale.

Drawings

The present application will be more fully understood from the detailed description given below with reference to the accompanying drawings, in which like reference numerals refer to like elements throughout the views. Wherein:

fig. 1 is a schematic diagram of an embodiment of a system for detecting electrolyte wettability of a battery according to the present application.

Detailed Description

To assist those skilled in the art in understanding the subject matter claimed herein, a detailed description of the present application is provided below along with accompanying figures.

The application relates to a system applied to quantitative measurement of electrolyte wettability of a storage battery. Fig. 1 shows a schematic diagram of the system.

As can be seen from fig. 1, the system consists of a plurality of devices, including a first container 1, a measuring device 2, a suction device 3, a heating device 4, a second container 7, and a data output device 5.

The first container 1 is used to contain a battery and an electrolyte. A suction device 3 is connected to the first container 1 to suck air in the first container 1. The suction device 3 can maintain the first container 1 at a set vacuum degree. During the experiment, the battery was immersed in the electrolyte. The measuring device 2 weighs the battery. The weight of the storage battery is increased from the beginning to the complete soaking by the electrolyte, and the measuring device 2 can sense the weight change of the storage battery in the soaking time period, so that the electrolyte soaking amount of the storage battery is obtained. The measuring device 2 is connected to a data output device 5 in a communication manner, and an operator can read data of the measuring device 2 through the data output device 5. The communication connection may be any of a variety of known data transmission techniques including, but not limited to, a wireless connection. Since the data output device 5 can be wirelessly connected to the measuring device 2, it can be located close to the operator and far away from other devices of the system.

The measuring device 2 is arranged in the first container 1 together with the accumulator. As can be seen from fig. 1, a holder 11 is arranged in the first container 1, and the measuring device 2 is supported on the holder 11. The electrolyte is under the support 11 but not in contact with the support 11, in an amount sufficient to be able to immerse the whole battery. An inelastic rope 21 is connected to the storage battery, and one end of the rope 21, which is far away from the storage battery, is suspended at the bottom of the measuring device 2. In particular, the winding core 6 of the accumulator is suspended at the bottom of the measuring device 2 and immersed in the electrolyte. When the core 6 starts to be soaked with the electrolyte and after the core 6 is completely soaked with the electrolyte, the buoyancy of the core 6 in the electrolyte changes, so that the weight reading of the measuring device 2 for the core 6 correspondingly changes, and the change can reflect the amount of the electrolyte soaked into the core 6.

Since the core 6 is suspended from the measuring device 2 for measurement, it can be determined that the reading of the measuring device 2 is only about the core 6, and that this reading does not incorporate other factors that affect the weight of the core 6.

The measuring device 2 can be an electronic balance or other measuring means or sensors for measuring forces or masses, as would be appreciated by a person skilled in the art. A transmitter may be integrated with or separately provided on the measuring device 2 to wirelessly transmit the measurement data to the data output device.

The first container 1 and the measuring device 2 may constitute a sealed system, the measuring device 2 being predisposed inside the first container 1. In order to facilitate the feeding of the winding core 6 into the first container 1, an opening for allowing the winding core 6 to pass is provided in the first container 1, and the opening is sealed after the winding core 6 is fed into the first container 1. The opening is provided to be sealable, and thus can be reused.

The suction device 3 comprises a pump 31 and a valve 32. The pump 31 is connected to the first container 1 via a pipe 33. The valve 32 is arranged on the conduit 33. The valve 32 can function as a switch, and when the valve 32 is opened, the pump 31 works to pump out the air in the first container 1; when valve 32 is closed, first container 1 is maintained at a set degree of vacuum to perform electrolyte wettability measurement of the battery.

It is also seen from fig. 1 that a second container 7 is arranged in addition to the first container 1. The second container 7 contains the first container 1 and a heating medium. The heating medium may be water or other fluid. The first container 1 is disposed within the second container 7 in any desired manner. The volume of the second container 7 is set so that the level of the heating medium is higher than the level of the electrolyte in the first container 1, thereby ensuring the internal temperature of the first container 1. The first container 1 is heated by the heating device 4. The heating device 4 includes a heating rod 41 in a heating medium and an agitator 42 that causes the heating medium to flow. The heating rod 41 may be any heating device as would occur to one skilled in the art including, but not limited to, an electromagnetic heating rod or the like. The stirrer 42 can achieve uniform heating in the second container 7. The heating device 4 is arranged to provide a stable temperature condition for the system.

The data output device 5 can also be connected to the suction device 3 and the heating device 4 in a communication manner, in addition to the measuring device 2. The operator can acquire vacuum level data of the suction device 3 and temperature data of the heating device 4 through the data output device 5. It is conceivable to provide various sensors in the first container 1 to directly obtain temperature data of the electrolyte and/or vacuum data in the first container 1; a timer can also be provided on the measuring device 2 or the data output device 5 to record the immersion time. Of course, the data output device 5 may also be provided with a transmitter to transmit the instructions of each device of the regulating system to the corresponding device, so as to more effectively control the condition parameters for detecting the electrolyte wettability of the storage battery.

The working process of the system for detecting the electrolyte wettability of the storage battery can be carried out according to the following steps: 1) Pouring the electrolyte used for the winding core 6 into the first container 1 to ensure that the winding core 6 can be immersed by the electrolyte; 2) The heating device 4 is switched on and the desired temperature is set, such as: 45 ℃; 3) After the temperature is constant, connecting the winding core 6 to be detected with the rope 21 so as to connect the winding core to the measuring device 2, and ensuring that the winding core 6 is immersed in the electrolyte again; 4) Sealing the first container 1; 5) Opening the valve 32, the pump 31 is operated to vacuumize the first container 1, and after reaching a set vacuum degree, such as-90 kPa, closing the valve 32, and then closing the pump 31; 6) The measuring device 2 records the weight of the winding core 6 in real time in the experimental process, namely the weight reading of the winding core 6 when the winding core is immersed in the electrolyte is M1 (which is represented as the minimum weight value of the winding core when the electrolyte is about to enter the winding core), the weight reading of the winding core 6 basically does not change after the time T, the weight reading is M2, the time T is the time required by the electrolyte to completely soak the winding core, and the (M2-M1) is the electrolyte soaking amount. The operator sees the reading through the data output device 5. The operator also sees the vacuum readings and temperature readings of the system during the experiment through the data output device 5.

While specific embodiments of the present application have been shown and described in detail to illustrate the principles of the application, it will be understood that the application may be embodied otherwise without departing from such principles.

Claims

1. A system for detecting electrolyte wettability of a storage battery is characterized by comprising:

a first container (1), the first container (1) being used for containing a storage battery and an electrolyte to be detected;

a measuring device (2), the measuring device (2) being arranged to sense a change in weight of the battery over a wetting time period;

-suction means (3), said suction means (3) being arranged in connection with said first container (1) to suck air inside said first container (1);

-heating means (4), said heating means (4) being arranged to heat said first container (1); and

a data output device (5), the data output device (5) being arranged in communicative connection with the measuring device (2).

2. The system of claim 1, wherein: the first container (1) is arranged to accommodate the measuring device (2) and the winding core (6) of the accumulator.

3. A system according to claim 1 or 2, characterized in that: the measuring device (2) is arranged to suspend the winding core (6) of the accumulator from the bottom of the measuring device (2) by means of a rope (21).

4. A system according to claim 1 or 2, characterized in that: the first container (1) has an opening allowing the battery to enter the first container (1), the opening being arranged to be sealable.

5. The system of claim 3, wherein: a support (11) is arranged in the first container (1) to support the measuring device (2), and the measuring device (2) comprises an electronic balance.

6. A system according to claim 1 or 2, characterized in that: the system further comprises a second container (7) containing a heating medium, the first container (1) being in the second container (7) such that the heating device (4) heats the first container (1) by heating the heating medium.

7. The system of claim 6, wherein: the heating device (4) includes a heating rod (41) placed in the heating medium and an agitator (42) that flows the heating medium.

8. The system of claim 6, wherein: the volume of the second container (7) is set such that the level of the heating medium therein is higher than the level of the electrolyte in the first container (1).

9. A system according to claim 1 or 2, characterized in that: the suction device (3) comprises a pump (31) and a valve (32), the pump (31) being connected to the first container (1) by a conduit (33), the valve (32) being arranged on the conduit (33) between the pump (31) and the first container (1).

10. A system according to claim 1 or 2, characterized in that: the data output device (5) is also in communication with at least one of the suction device (3) and the heating device (4).