Constant-temperature and constant-voltage testing device for battery cell

Abstract

The utility model relates to the technical field of battery cell testing devices, in particular to a constant-temperature and constant-voltage testing device for a battery cell, which comprises an outer cover, an upper template and a lower template are arranged in the outer cover, the battery cell to be tested is arranged between the upper template and the lower template, a constant-voltage device and a constant-temperature device are arranged in the outer cover, and the constant-voltage device and the constant-temperature device are arranged in the outer cover. The constant pressure device comprises an electric pressure cylinder for changing the distance between the upper template and the lower template; the constant temperature device comprises a liquid cooling plate attached to the battery cell; the constant-temperature and constant-voltage device is used for ensuring that the battery cell is in a constant-temperature and constant-voltage state in the testing process, so that the testing accuracy is ensured, and the service life of the battery cell is also prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of battery core testing devices, in particular to a constant temperature and constant pressure testing device for a battery core. Background Art

[0002] In recent years, the rapid development of the new energy industry has led to the widespread use of lithium-ion batteries in fields such as electric vehicles and energy storage. These lithium-ion batteries have many advantages, such as light weight, high energy density, fast charging capability and long life. However, lithium-ion batteries generate a large amount of heat during the charging and discharging process, causing the battery temperature to rise sharply and the volume to expand. This not only damages the packaged battery device (the battery consists of multiple cells), but also may shorten the service life of the lithium-ion battery.

[0003] Application number CN202121287439.9 is a device for testing the expansion force of liquid-cooled battery cells. The device includes a fixed plate, a tested battery cell, and a processor. The top of the fixed plate is fixedly connected to a force sensor, the top of the fixed plate is fixedly connected to multiple support columns, and a transfer plate is slidably connected to the bottom between the multiple support columns. The top of the transfer plate is fixedly connected to a first liquid cooling module, and the bottom of the transfer plate contacts the force sensor. The top between the multiple support columns is slidably connected to a detachable top plate, and the bottom of the detachable top plate is fixedly connected to a second liquid cooling module. The tested battery cell is sandwiched between the first liquid cooling module and the second liquid cooling module. One end of the second liquid cooling module is connected to a liquid inlet pipe. During the charging and discharging process, the heat energy on the tested battery cell is removed by the continuous circulation of the coolant, thereby keeping the tested battery cell at a reasonable temperature. Therefore, the expansion force of the battery cell can be measured while controlling the temperature of the tested battery cell itself. Although it can ensure that the test temperature of the battery cell remains constant, the device designed by this design method cannot meet the requirement that the pressure of the battery cell is kept within a reasonable range during the test. Utility Model Content

[0004] The technical problem to be solved by the utility model is that it is difficult to ensure that the battery cell is in a constant temperature and constant pressure state during the battery cell testing process.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] First, a constant temperature and constant pressure testing device for a battery cell is provided, comprising an outer cover, an upper template and a lower template are arranged in the outer cover, a battery cell to be tested is placed between the upper template and the lower template, a constant pressure device and a constant temperature device are arranged in the outer cover, the constant pressure device includes an electric pressure cylinder that changes the distance between the upper template and the lower template, and the constant temperature device includes a liquid cooling plate that is bonded to the battery cell.

[0007] By controlling the distance between the upper and lower templates, the pressure applied to the battery cell can be changed, so that the battery cell can be continuously subjected to the preset pressure. The liquid cooling plate can remove the heat emitted by the battery cell, thereby ensuring that the battery cell operates at the preset temperature.

[0008] Furthermore, the output end of the electric pressure cylinder is connected to the upper template, and a pressure sensor is provided between the electric pressure cylinder and the upper template; the upper template is moved by the extension and contraction of the electric pressure cylinder, thereby changing the distance between the upper and lower templates, so that the battery cell can still be subjected to the same pressure after the volume changes.

[0009] Furthermore, an electric cylinder mounting plate is installed at the output end of the electric pressure cylinder, and a pressure sensor is installed between the electric cylinder mounting plate and the upper template; the pressure sensor is used to ensure that the pressure exerted by the upper template on the battery cell always remains consistent.

[0010] Furthermore, a top pressure mounting plate is provided between the electric cylinder mounting plate and the upper template.

[0011] Furthermore, several guide rods are provided in the outer cover, and the guide rods are sequentially passed through the electric cylinder mounting plate, the top pressure mounting plate, the upper template and the lower template; the guide rods are used to ensure that the upper template is more stable during movement, thereby improving the stability of the device.

[0012] Furthermore, liquid cooling plates are provided between the battery cell and the upper and lower templates, and temperature sensors are installed on the liquid cooling plates; the liquid cooling plates are used to cool the upper and lower parts of the battery cell to ensure that the temperature of the battery cell is in a stable state.

[0013] Furthermore, the constant temperature device includes a hydraulic pump, which is connected to the liquid cooling plate. The hydraulic pump is used to drive the liquid in the liquid cooling plate to move, thereby taking away the heat emitted by the battery cell.

[0014] Furthermore, an auxiliary cooling plate surrounding the three sides of the battery cell is arranged between the upper template and the lower template, the auxiliary cooling plate is connected to the hydraulic pump, and a temperature sensor is arranged on the auxiliary cooling plate; the auxiliary cooling plate is used to absorb the heat emitted from the three sides of the battery cell to ensure that the temperature of the battery cell is within a certain range.

[0015] Furthermore, elastic EV foam is provided between the battery cell and the upper template and the lower template; the elastic EV foam is used to buffer the pressure acting on the battery cell, effectively protecting the battery cell and making the use effect of the device better.

[0016] Furthermore, the outer cover is provided with an emergency stop switch, a pressure display, a temperature display, a touch screen and a double-start switch.

[0017] The utility model has the following beneficial effects: the utility model uses a constant voltage device to ensure that the battery cell is in a constant voltage state, thereby extending the service life of the battery cell and ensuring better test results; at the same time, the constant temperature device ensures that the battery cell operates at a preset temperature during the test, so that the test results are more stable and reliable; at the same time, the auxiliary cooling plate and the liquid cooling plate are used to ensure that the effect is better in the process of cooling the battery, and the setting of the temperature sensor can also measure the temperature of the five surfaces of the battery cell, which is conducive to the analysis of the heat generation characteristics of the battery cell and safety warning. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0019] Figure 1 Schematic diagram of the structure of this embodiment;

[0020] Figure 2 Schematic diagram of the structure of the constant pressure device of this embodiment;

[0021] Figure 3 Schematic diagram of the structure of the thermostat of this embodiment. DETAILED DESCRIPTION

[0022] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation methods in conjunction with the accompanying drawings.

[0023] It should be noted that all directional indications in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0024] In addition, the terms "first," "second," and so on, used in this utility model are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0025] In this utility model, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0026] The utility model provides a constant temperature and constant pressure testing device for a battery cell, such as Figure 1 As shown, it includes a base 10, an outer cover 11 is installed on the base 10, an upper template 20 and a lower template 21 are installed in the outer cover 11, wherein the battery cell 12 to be tested is placed between the upper template 20 and the lower template 21 for charge and discharge testing.

[0027] The battery cell not only releases heat during the charging and discharging process, but the volume of the battery cell 12 also changes. Specifically, the thickness of the battery cell 12 decreases during the discharging process, and the thickness of the battery cell 12 increases during the charging process. Therefore, in order to ensure that the battery cell 12 is in a constant voltage state, a constant voltage device is provided between the upper template 20 and the lower template 21.

[0028] like Figure 1 and Figure 2 As shown, the constant pressure device includes an electric pressure cylinder 30, which is installed on the outer cover 11. The output end of the electric pressure cylinder 30 is connected to the upper template 20. When the electric pressure cylinder 30 is extended, the upper template 20 squeezes the battery cell 12. When the electric pressure cylinder 30 is shortened, the upper template 20 is away from the battery cell 12. A pressure sensor 31 is provided between the electric pressure cylinder 30 and the upper template 20 to detect the pressure exerted by the upper template 20 on the battery cell 12. When the battery cell 12 changes in volume during the charging and discharging process, the electric pressure cylinder 30 is synchronously extended and contracted to keep the pressure exerted by the upper template 20 on the battery cell 12 within a preset size.

[0029] In order to ensure that the entire equipment operates more stably, an electric cylinder mounting plate 35 is installed at the output end of the electric pressure cylinder 30, wherein a top pressure mounting plate 36 is arranged between the electric cylinder mounting plate 35 and the upper template 20, wherein several guide rods 37 are arranged in the outer cover 11, and the guide rods 37 are sequentially passed through the electric cylinder mounting plate 35, the top pressure mounting plate 36, the upper template 20 and the lower template 21 to ensure that the electric pressure cylinder 30 is more stable when working.

[0030] During the charging and discharging process, the battery cell 12 releases heat, causing the overall temperature of the battery cell to rise. In order to keep the battery cell 12 in a constant temperature state, a liquid cooling plate 32 is provided between the upper template 20, the lower template 21 and the battery cell 12, and a hydraulic pump 33 is provided in the outer cover 11. The hydraulic pump 33 is connected to the liquid cooling plate 32. When the hydraulic pump 33 is working, the liquid can flow in the liquid cooling plate 32, thereby taking away the heat emitted by the battery cell 12 and reducing the temperature of the battery cell 12.

[0031] like Figure 1 and Figure 3 As shown, a temperature sensor is installed on the liquid cooling plate 32 to detect the temperature of the battery cell 12. When the temperature of the battery cell 12 rises, the hydraulic pump 33 works to drive the liquid in the liquid cooling plate 32 to flow, thereby taking away the heat of the battery cell 12. Since the upper and lower templates can only take away the heat from the upper and lower parts of the battery cell 12, in order to better cool the battery cell 12, an auxiliary cooling plate 34 is provided between the upper template 20 and the lower template 21 to surround the three sides of the battery cell 12. A temperature sensor is provided on the auxiliary cooling plate 34, and the auxiliary cooling plate 34 is connected to the hydraulic pump 33 to drive the liquid flow in the auxiliary cooling plate 34.

[0032] When the temperature sensor detects that the temperature of the battery cell 12 rises rapidly, the operating power of the hydraulic pump 33 increases, which accelerates the flow rate of the liquid in the liquid cooling plate 32 and the auxiliary cooling plate 34, thereby accelerating the temperature reduction rate of the battery cell and ensuring that the battery cell is at a preset temperature.

[0033] In order to ensure that the constant pressure device effectively protects the battery cell 12 when it acts on the battery cell 12 , an elastic EV foam 38 is provided between the liquid cooling plate 32 and the battery cell 12 .

[0034] like Figure 1 As shown, an emergency stop switch 13, a pressure display 14, a temperature display 15, a touch screen 16 and a double-start switch 17 are provided on the outer cover 11.

[0035] It should be understood that the above description of the specific embodiments of the present invention is merely for the purpose of illustrating the technical approach and features of the present invention. Its purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. However, the present invention is not limited to the above-described specific embodiments. Any changes or modifications made within the scope of the claims of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A constant temperature and constant pressure testing device for a battery cell, characterized in that: The invention comprises an outer cover (11), wherein an upper template (20) and a lower template (21) are arranged in the outer cover (11), a battery cell (12) to be tested is placed between the upper template (20) and the lower template (21), and a constant pressure device and a constant temperature device are arranged in the outer cover (11), wherein the constant pressure device comprises an electric pressure cylinder (30) for changing the distance between the upper template (20) and the lower template (21), and the constant temperature device comprises a liquid cooling plate (32) in contact with the battery cell (12).

2. A constant temperature and constant pressure testing device for a battery cell according to claim 1, characterized in that: The output end of the electric pressure cylinder (30) is connected to the upper template (20), and a pressure sensor (31) is provided between the electric pressure cylinder (30) and the upper template (20).

3. A constant temperature and constant voltage testing device for a battery cell according to claim 2, characterized in that: An electric cylinder mounting plate (35) is installed at the output end of the electric pressure cylinder (30), and a pressure sensor (31) is installed between the electric cylinder mounting plate (35) and the upper template (20).

4. A constant temperature and constant voltage testing device for a battery cell according to claim 3, characterized in that: A top pressure mounting plate (36) is provided between the electric cylinder mounting plate (35) and the upper template (20).

5. The constant temperature and constant voltage testing device for a battery cell according to claim 4, characterized in that: Several guide rods (37) are arranged in the outer cover (11), and the guide rods (37) are sequentially inserted between the electric cylinder mounting plate (35), the top pressure mounting plate (36), the upper template (20) and the lower template (21).

6. The constant temperature and constant voltage testing device for a battery cell according to claim 1, characterized in that: A liquid cooling plate (32) is provided between the battery core (12) and the upper template (20) and the lower template (21), and a temperature sensor is installed on the liquid cooling plate (32).

7. The constant temperature and constant voltage testing device for a battery cell according to claim 1, characterized in that: The constant temperature device includes a hydraulic pump (33), and the hydraulic pump (33) is communicated with the liquid cooling plate (32).

8. The constant temperature and constant voltage testing device for a battery cell according to claim 7, characterized in that: An auxiliary cooling plate (34) surrounding three sides of the battery core (12) is provided between the upper template (20) and the lower template (21); the auxiliary cooling plate (34) is connected to the hydraulic pump (33); and a temperature sensor is provided on the auxiliary cooling plate (34).

9. The constant temperature and constant voltage testing device for a battery cell according to claim 1, characterized in that: Elastic EV foam (38) is provided between the battery core (12) and the upper template (20) and the lower template (21).

10. The constant temperature and constant voltage testing device for a battery cell according to claim 1, characterized in that: The outer cover (11) is provided with an emergency stop switch (13), a pressure display (14), a temperature display (15), a touch screen (16) and a double-start switch (17).

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