Testing device for liquid retention capacity of battery

Abstract

The utility model relates to the technical field of batteries, in particular to a battery liquid retention capacity testing device which comprises a testing cabinet and a plurality of shells, each shell is provided with a testing cavity, a temperature sensor, an equipment cavity and a temperature control assembly, and the testing cabinet comprises a control device. The control device receives data signals collected by the temperature sensor and controls the temperature control assembly to conduct temperature rising and cooling. When in use, the temperature sensor monitors the temperature of the battery in real time and feeds data back to the control device, and the control device automatically adjusts the temperature in the shell through the temperature control assembly according to a preset temperature range, so that the battery is tested under a stable temperature condition; the temperature of each battery can be independently and accurately controlled by adopting a multi-shell structure, so that the cyclic diving phenomenon of the batteries in the test is reduced, the temperature of each battery can be independently and accurately controlled by adopting a multi-shell structure, and the problem caused by the fact that adjustment cannot be carried out according to the temperature condition of each battery in a traditional method is effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a device for testing the liquid retention amount of a battery. Background Art

[0002] Battery fluid retention refers to the amount of electrolyte retained in the battery, that is, the lowest liquid level line of the electrolyte. This liquid level line indicates the lowest height of the electrolyte that needs to be maintained inside the battery.

[0003] The amount of electrolyte has a great influence on the performance of cylindrical batteries. After the battery space size is determined, the rigid shell of the battery is not elastic. After the positive and negative electrodes and auxiliary materials are designed, the space left for the electrolyte is relatively limited. Therefore, the amount of electrolyte needs to be determined. However, in actual experiments, multiple batteries are usually placed directly in a test cabinet for testing. This test method is prone to the following problems:

[0004] Problem 1: During the charging and initial discharging stages of cylindrical batteries, the temperature rise caused by the chemical reaction in the battery causes the battery poles to expand, increasing the stress on the winding core, squeezing out the electrolyte, and causing electrolyte bubbling;

[0005] Problem 2: During the discharge process, as the current decreases, the heat generated will also decrease, which will reduce the stress of the battery pole piece. The electrolyte is prone to untimely or insufficient reflux during the recovery process, resulting in the electrolyte failing to fill the pole piece pores in time, and ultimately causing the cylindrical battery to experience cycle diving;

[0006] Problem 3: When multiple batteries are tested synchronously, the test cabinet can only perform overall control over the test environment inside the cabinet and cannot regulate the temperature of a single battery. Therefore, problems 1 and 2 are likely to occur.

[0007] In view of this, we propose a battery liquid retention test device. Utility Model Content

[0008] The purpose of the utility model is to provide a device for controlling the temperature of a single battery, thereby testing the liquid content of the battery, so as to solve the problems raised in the above-mentioned background technology.

[0009] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0010] A battery liquid retention test device includes a test cabinet and a plurality of shells, wherein a test cavity is provided in the shell, an equipment cavity is provided between the test cavity and the shell, a temperature control component for regulating the temperature of the battery is provided in the equipment cavity, and a temperature sensor for measuring the temperature of the battery shell is provided on the outside of the shell; the test cabinet includes a control device, which receives a data signal collected by the temperature sensor and controls the temperature control component to increase or decrease the temperature.

[0011] As a further solution of the utility model: the temperature control component includes a heating wire and a cooling tube.

[0012] As a further solution of the utility model: the two sides of the heating wire and the cooling tube are respectively fixed to the two sides of the inner wall of the equipment cavity.

[0013] As a further solution of the utility model: the heating wire and the cooling tube are arranged alternately around the outside of the test cavity, the heating wire and the cooling tube are not in contact, and a waterproof film is provided on the outer surface of the cooling tube.

[0014] As a further solution of the utility model: the temperature sensor is bonded to the surface of the shell, and the probe of the temperature sensor is arranged at the bottom of the test cavity.

[0015] As a further solution of the utility model: a plurality of sockets are arranged on the surface of the shell, one of which is a power supply port of the heating wire, and two sockets are respectively a water inlet and a water outlet of the cooling pipe.

[0016] As a further solution of the utility model: the height of the test cavity is consistent with the battery to be tested, the inner diameter of the test cavity is larger than the diameter of the battery to be tested, and the range by which the inner diameter of the test cavity exceeds the diameter of the battery to be tested is 0.2cm to 1cm.

[0017] As a further solution of the utility model: the material of the cooling tube is one of PP, PET, and PTFE polymer materials.

[0018] As a further solution of the utility model: the coolant in the cooling tube is one of water, alcohol and acetone.

[0019] As a further solution of the utility model: the main body of the temperature sensor is electrically connected to the control device, and the control device controls the opening and closing of the heating wire power supply switch and the coolant input switch in the cooling pipe through electrical control.

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] 1. In the battery liquid retention test device, the temperature of the battery is monitored in real time by a temperature sensor, and the data is fed back to the control device. The control device automatically adjusts the temperature inside the shell through the temperature control component according to the preset temperature range to ensure that the battery is tested under stable temperature conditions, thereby reducing the cycle diving phenomenon of the battery during the test.

[0022] 2. In the battery liquid retention test device, by adopting a multi-shell structure, each battery is in an independent test environment, so the temperature of each battery can be independently and accurately controlled, effectively avoiding the problems caused by the traditional method that cannot be adjusted according to the temperature conditions of each battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the overall structure of this scheme;

[0024] Figure 2 This is a schematic cross-sectional view of the shell of this scheme;

[0025] Figure 3 This is a schematic diagram of the temperature control components of this solution.

[0026] The meaning of each number in the figure is:

[0027] 100, housing; 101, temperature sensor; 102, test chamber; 103, equipment chamber; 104, power supply port; 105, water inlet; 106, drain port;

[0028] 110. Temperature control component; 111. Heating wire; 112. Cooling tube. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] like Figure 1 - Figure 3As shown, this embodiment provides a battery liquid retention test device, including a test cabinet and a plurality of shells 100, wherein a test cavity 102 is provided in the shell 100, and a single battery to be tested is inserted into the test cavity 102 for testing, and an interlayer is provided between the test cavity 102 and the shell 100, and the interlayer is called a device cavity 103, and a temperature control component 110 is installed in the device cavity 103, and a temperature sensor 101 is provided on the outside of the shell 100, and the test cabinet includes a control device, which receives the data signal collected by the temperature sensor 101 and controls the temperature control component 110 to increase or decrease the temperature, so as to realize the temperature control processing of the battery.

[0031] The improvement of this embodiment is that the temperature of the battery is monitored in real time by the temperature sensor 101, and the data is fed back to the control device of the test cabinet. The control device of the test cabinet increases or decreases the temperature of the temperature control component 110 according to the preset temperature range, thereby adjusting the temperature inside the shell 100 to ensure that the battery is tested under stable temperature conditions, thereby reducing the cyclic diving phenomenon of the battery during the test. At the same time, a multi-shell 100 structure is adopted, and each battery is in an independent test environment. Therefore, the temperature of each battery can be independently and accurately controlled, effectively avoiding the problems caused by the inability to adjust according to the temperature conditions of each battery in the traditional method.

[0032] like Figure 2 and Figure 3 As shown, considering that the battery needs to be kept within a set temperature range during the test, the temperature control component 110 includes a heating wire 111 and a cooling tube 112. The heating wire 111 is electrically heated to increase the temperature of the test cavity 102, and the condensate flowing in the cooling tube 112 cools the test cavity 102, thereby achieving temperature control of the battery;

[0033] In order to achieve a better temperature control effect and facilitate the installation of the temperature control component 110, the heating wire 111 and the two sides of the cooling tube 112 are respectively fixed to the two sides of the inner wall of the equipment cavity 103. The inner side of the equipment cavity 103 and the outer side of the test cavity 102 are common walls. The heating wire 111 and the cooling tube 112 are attached to the common wall to reduce the loss of energy transfer.

[0034] At the same time, in order to make the battery cool down and heat up more evenly, the heating wire 111 and the cooling tube 112 are staggered around the outside of the test cavity 102. In this embodiment, the heating wire 111 and the cooling tube 112 are preferably spirally tubular, so that the heating wire 111 and the cooling tube 112 are conveniently sleeved and fixed on the outside of the test cavity 102. It should be noted that the heating wire 111 and the cooling tube 112 are not in contact with each other, so as to avoid the heating wire 111 and the cooling tube 112 being attached to each other during the temperature adjustment process, causing energy loss, and reducing the temperature adjustment effect. In addition, a waterproof film is provided on the outer surface of the cooling tube 112 to avoid water droplets on the outer surface of the cooling tube 112 during the cooling process, causing damage to the internal equipment.

[0035] In order to accurately measure the temperature of the battery shell, the main part of the temperature sensor 101 is bonded to the surface of the shell 100, and the probe of the temperature sensor 101 is arranged at the bottom of the test cavity 102. The probe of the temperature sensor 101 is in direct contact with the battery shell, so that the change of the battery shell temperature can be measured more accurately. At the same time, the main part of the temperature sensor 101 is also convenient to be connected with the control device of the test cabinet, which is convenient for wiring processing.

[0036] Considering the long-term use of the cooling pipe 112, to avoid the selected coolant from corroding the cooling pipe 112 and causing damage to the equipment, the cooling pipe 112 is made of a polymer material such as PP, PET, or PTFE. The corrosion resistance and chemical stability of the polymer material are used to enhance the service life of the cooling pipe 112.

[0037] The coolant in the cooling tube 112 is one of water, alcohol, and acetone. Considering cost saving, in this embodiment, the coolant is preferably liquid water.

[0038] like Figure 2 As shown, considering the external use of the heating wire 111 and the cooling tube 112, a plurality of sockets are provided on the surface of the housing 100, one of which is a power supply port 104 of the heating wire 111, and two sockets are respectively a water inlet 105 and a drain port 106 of the cooling tube 112;

[0039] Considering the control of opening and closing of the temperature control component 110, the temperature control component 110 and the main body of the temperature sensor 101 are electrically connected to the control device respectively, and the control device receives the data transmitted by the temperature sensor 101. When the data exceeds the preset temperature range, the control device controls the opening and closing of the power supply switch of the heating wire 111 and the coolant input switch in the cooling tube 112 respectively through electrical control, thereby realizing the temperature regulation of the battery;

[0040] In order to facilitate placing the battery to be tested into the test cavity 102, the height of the test cavity 102 is consistent with the battery to be tested, and the inner diameter of the test cavity 102 is larger than the diameter of the battery to be tested. The inner diameter of the test cavity 102 exceeds the diameter of the battery to be tested by 0.2 cm to 1 cm.

[0041] In summary, the working principle of this solution is as follows:

[0042] After the temperature sensor 101 is attached to the outside of the shell 100 and connected to the control device of the test cabinet, the water supply pipe, drainage pipe and power supply line of the test cabinet are respectively inserted into different sockets of the shell 100, and the power supply of the heating wire 111 and the flow of liquid water in the cooling tube 112 are preliminarily detected. According to the data displayed on the temperature sensor 101, it is confirmed that there is no problem with the equipment after the preliminary detection, and the battery to be detected is inserted into the test cavity 102 of the shell 100 to start the battery detection. During the detection, the battery produces temperature changes due to the internal chemical reaction, and the changed temperature is detected by the probe of the temperature sensor 101 through heat transfer and fed back to the control device of the test cabinet. When the data temperature transmitted by the temperature sensor 101 exceeds the preset temperature range, the control device of the test cabinet automatically controls the switch of the power supply of the heating wire 111 or the input of the coolant in the cooling tube 112, so that the heating wire 111 heats up to heat the battery, or the coolant in the cooling tube 112 flows to absorb heat and cool down, so that the temperature of the battery test is kept within a certain range.

[0043] Although this specification is described according to implementation modes, not every implementation mode includes only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0044] Therefore, the above description is only a preferred embodiment of the present application and is not intended to limit the scope of implementation of the present application; that is, all equivalent changes made according to the scope of the claims of the present application are within the protection scope of the claims of the present application.

Claims

1. A battery liquid retention test device, comprising a test cabinet and a plurality of housings (100), characterized in that: A test cavity (102) is provided in the shell (100), a device cavity (103) is provided between the test cavity (102) and the shell (100), a temperature control component (110) for regulating the temperature of a battery is provided in the device cavity (103), and a temperature sensor (101) for measuring the temperature of a battery shell is provided outside the shell (100); the test cabinet comprises a control device, the control device receives a data signal collected by the temperature sensor (101) and controls the temperature control component (110) to increase or decrease the temperature.

2. The battery liquid retention test device according to claim 1, characterized in that: The temperature control component (110) comprises a heating wire (111) and a cooling tube (112).

3. The battery liquid retention test device according to claim 2, characterized in that: The heating wire (111) and the cooling tube (112) are respectively fixed on two sides of the inner wall of the equipment cavity (103).

4. The battery liquid retention test device according to claim 2, characterized in that: The heating wires (111) and the cooling tubes (112) are arranged alternately around the outside of the test cavity (102); the heating wires (111) and the cooling tubes (112) are not in contact with each other; and a waterproof film is provided on the outer surface of the cooling tubes (112).

5. The battery liquid retention test device according to claim 1, characterized in that: The body of the temperature sensor (101) is bonded to the surface of the housing (100), and the probe of the temperature sensor (101) is arranged at the bottom of the test cavity (102).

6. The battery liquid retention test device according to claim 2, characterized in that: The surface of the housing (100) is provided with a plurality of sockets, one of which is a power supply port (104) of the heating wire (111), and two of which are a water inlet (105) and a water outlet (106) of the cooling pipe (112).

7. The battery liquid retention test device according to claim 1, characterized in that: The height of the test cavity (102) is consistent with that of the battery to be tested, the inner diameter of the test cavity (102) is larger than the diameter of the battery to be tested, and the inner diameter of the test cavity (102) exceeds the diameter of the battery to be tested by 0.2 cm to 1 cm.

8. The battery liquid retention test device according to claim 2, characterized in that: The material of the cooling tube (112) is one of PP, PET and PTFE polymer materials.

9. The battery liquid retention test device according to claim 2, characterized in that: The cooling liquid in the cooling pipe (112) is one of water, alcohol and acetone.

10. The battery liquid retention test device according to claim 2, characterized in that: The main body of the temperature sensor (101) is electrically connected to the control device, and the control device controls the opening and closing of the power supply switch of the heating wire (111) and the coolant input switch in the cooling tube (112) respectively through electrical control.

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