Battery pack heat radiation quantity detection system and method

Abstract

The invention discloses a battery pack heat radiation quantity detection system and method, and the method comprises the steps: placing a battery pack in a walk-in environment chamber, carrying out the temperature regulation of the walk-in environment chamber, enabling the walk-in environment chamber to achieve the dynamic balance at a preset temperature value, adjusting the temperature of the battery pack to be consistent with the temperature of the walk-in environment chamber, and carrying out the detection of the heat radiation quantity of the battery pack. When a charging or discharging test is carried out, the battery pack emits heat, and the refrigeration value of the step-in environmental chamber is kept unchanged, so that in order to maintain the dynamic balance of the temperature, the energy consumed by heating of the step-in environmental chamber is reduced, and the energy consumption of the battery pack is reduced. Through the test system and the test method, the thermal radiation value generated during charging or discharging of the battery pack can be accurately calculated; and the whole test process can ensure personnel safety, and the thermal radiation value conditions of the battery pack at different temperatures can be tested.

Description

Technical Field

[0001] The present invention belongs to the technical field of lithium battery testing, and in particular relates to a battery pack thermal radiation detection system and method. Background Art

[0002] New energy electric vehicles are currently gradually increasing their market share, but the battery performance of electric vehicles is a key technical point. Battery safety testing and other related performance tests have become indispensable and important links. Among them, how to test the radiant heat dissipation of automotive battery packs during the charging and discharging process has become a testing difficulty; the existing testing method usually uses simple temperature sensors to perform heat statistics and estimation, which cannot more accurately calculate the thermal radiation of the battery pack. It is difficult to test the thermal radiation value of the battery pack during the charging or discharging process using only temperature sensors; in addition, rapid charging and discharging is required during the battery testing process, and the safety of the test environment and the accuracy of the test results need to be guaranteed. Therefore, a system and corresponding test method that can accurately test the thermal radiation value of the battery pack while ensuring test safety are required. Summary of the Invention

[0003] The purpose of the present invention is to provide a battery pack thermal radiation detection system and method, wherein the battery pack is placed in a walk-in environmental chamber, and the temperature of the walk-in environmental chamber is controlled so that the walk-in environmental chamber can reach a dynamic balance at a preset temperature value. After the temperature of the battery pack and the walk-in environmental chamber are adjusted to be consistent, a charging or discharging test is performed. During the charging or discharging test, the battery pack will emit heat, while the cooling value of the walk-in environmental chamber remains unchanged. Therefore, in order to maintain a dynamic temperature balance, the energy consumed by the walk-in environmental chamber for heating will be reduced. Through this test system and test method, the thermal radiation value generated by the battery pack during charging or discharging can be calculated more accurately.

[0004] The present invention is achieved through the following technical solutions: A battery pack thermal radiation detection system, comprising: A walk-in environmental chamber is provided with a temperature control module and a load reading module; the temperature control module is used to control the temperature of the walk-in environmental chamber; the load reading module is used to read and record the load value of the walk-in environmental chamber; A temperature measurement module is attached to the surface of the battery pack and is used to measure the temperature of the battery pack; A cooling module, the cooling module being used to adjust an initial measurement temperature of the battery pack; A charge and discharge module is used to charge or discharge the batteries in the battery pack.

[0005] Preferably, the temperature control module includes a refrigeration unit and a heating unit, and the refrigeration unit and the heating unit cooperate to cool down or heat up the walk-in environmental chamber to achieve intelligent temperature control.

[0006] Preferably, the load reading module includes a multifunctional electric energy meter, which is electrically connected to the walk-in environmental chamber and is used to record energy consumption changes when the walk-in environmental chamber tests the battery pack.

[0007] Preferably, the cooling module includes a chiller, which is arranged outside the walk-in environmental chamber. The chiller enters the walk-in environmental chamber through a pipeline and is connected to the heat exchange channel in the battery pack to cool the battery pack.

[0008] A method for detecting thermal radiation of a battery pack includes the following steps: S1: The battery pack will be placed in the walk-in environmental chamber and the battery pack charge will be checked; S2: Adjust the temperature of the walk-in environmental chamber so that its internal temperature reaches the predetermined value for the test and maintains dynamic balance; S3: Adjust the temperature of the battery pack to be close to the temperature of the walk-in environmental chamber; S4: Perform charge and discharge tests on the battery pack, recording the energy consumption of the walk-in environmental chamber to maintain a stable temperature during the battery pack charge and discharge process; S5: Perform statistics and calculations on the experimental data results.

[0009] Preferably, in step S1, the battery pack is placed in a walk-in environmental chamber, and the chiller is connected to the heat exchange channel of the battery pack, multiple patch temperature sensors are attached to the battery surface of the battery pack, and the patch temperature sensors are connected to the external control host; the charging and discharging equipment is connected to the battery pack.

[0010] Preferably, in step S2, the thermal radiation amount of the battery pack needs to be detected at multiple temperatures, and the preset temperatures of the walk-in environmental chamber include 25°C, 0°C and -20°C; when the preset temperature of the walk-in environmental chamber is 25°C, the manual forced cooling capacity is set to 75%, so that the walk-in environmental chamber reaches a dynamic equilibrium state of cold and heat confrontation and is maintained at 25°C; when the preset temperature of the walk-in environmental chamber is 0°C, the manual forced cooling capacity is set to 100%, so that the walk-in environmental chamber reaches a dynamic equilibrium state of cold and heat confrontation and is maintained at 0°C; when the preset temperature of the walk-in environmental chamber is -20°C, the manual forced cooling capacity is set to 100%, so that the walk-in environmental chamber reaches a dynamic equilibrium state of cold and heat confrontation and is maintained at -20°C.

[0011] Preferably, in step S3, the temperature of the battery pack is controlled by an external chiller so that its temperature is close to the preset setting of the walk-in environmental chamber and the temperature error is ensured to be less than ±2°C.

[0012] Preferably, in step S4, when the preset temperature of the walk-in environmental chamber is 25°C, the battery pack is charged and tested, and the change in heating energy consumption of the walk-in environmental chamber after the battery is fully charged is recorded; when the preset temperature of the walk-in environmental chamber is 0°C, the battery pack is discharged and tested, and the change in heating energy consumption of the walk-in environmental chamber after the battery is fully charged is recorded; when the preset temperature of the walk-in environmental chamber is -20°C, the battery pack is discharged and tested, and the change in heating energy consumption of the walk-in environmental chamber after the battery is fully charged is recorded.

[0013] Preferably, in step S5, the heat dissipation power of the battery pack for charging or discharging at the corresponding temperature is calculated based on the difference between the heating power consumption in the thermal equilibrium state before the walk-in environmental chamber test and the heating power consumption in the walk-in environmental chamber during the charging and discharging process of the battery pack; and the thermal radiation during the charging and discharging process is calculated based on the heat dissipation power.

[0014] Compared with the prior art, the present invention has the following advantages and beneficial effects: In the present invention, the battery pack is placed in a walk-in environmental chamber, and the temperature of the walk-in environmental chamber is controlled so that the walk-in environmental chamber can reach a dynamic balance at a preset temperature value. After the temperature of the battery pack and the walk-in environmental chamber are adjusted to be consistent, a charging or discharging test is performed. During the charging or discharging test, the battery pack will emit heat, while the cooling value of the walk-in environmental chamber remains unchanged. Therefore, in order to maintain the dynamic balance of temperature, the energy consumed by the walk-in environmental chamber for heating will be reduced. Through this test system and test method, the thermal radiation value generated by the battery pack during charging or discharging can be calculated more accurately; and the entire test process can ensure personnel safety, and the thermal radiation value of the battery pack at different temperatures can also be tested. DETAILED DESCRIPTION

[0015] Example 1: A battery pack thermal radiation detection system includes: a walk-in environmental chamber, which is provided with a temperature control module and a load reading module; the temperature control module is used to control the temperature of the walk-in environmental chamber so that the temperature of the walk-in environmental chamber reaches a dynamic equilibrium state; the load reading module is used to read and record the load value of the walk-in environmental chamber; a temperature measuring module, which is attached to the surface of the battery pack and is used to measure the temperature of the battery pack, and the temperature measuring module is composed of multiple patch temperature sensors. The data of the temperature measuring module and the data of the walk-in environmental chamber are both transmitted to a control host and read and recorded by the control host; a cooling module, which is used to adjust the initial measurement temperature of the battery pack so that the initial temperature of the battery pack is close to the set temperature of the walk-in environmental chamber and ensures that the error temperature is less than ±2°C; a charge and discharge module, which is used to charge or discharge the batteries in the battery pack. The battery pack will generate thermal radiation during the charging or discharging process. The heat generated by the thermal radiation can affect the reduction of the heat generated by the heating of the walk-in environmental chamber. The temperature control module includes a refrigeration unit and a heating unit. The refrigeration unit and the heating unit cooperate to cool down or heat up the walk-in environmental chamber to realize intelligent temperature control. During the test, the refrigeration unit is forced to turn on. In order to reach the predetermined temperature, the heating unit will start to counteract the low temperature generated by the refrigeration unit, and finally reach a state of dynamic temperature balance. For example, the preset temperature is 25°C, and the forced output of the refrigeration unit is 30%. Then the heating unit needs to have a corresponding heat output value to maintain the temperature at 25°C. Heat will be generated during the charging or discharging process of the battery pack. The heat will destroy the original dynamic temperature balance in the walk-in environmental chamber. Therefore, in order to ensure temperature stability, the walk-in environmental chamber will reduce heating according to the heat released by the battery pack, thus generating a temperature difference before and after the test. The energy consumption difference after the test can be calculated based on the energy consumption difference, and the thermal radiation value released during the charging or discharging process of the battery pack can be calculated; the load reading module includes a multi-function electricity meter, which is electrically connected to the walk-in environmental chamber, and the multi-function electricity meter is used to record the energy consumption value of the walk-in environmental chamber when the temperature is dynamically balanced, and record the energy consumption changes when the walk-in environmental chamber tests the battery pack; the cooling module includes a chiller, which is arranged outside the walk-in environmental chamber, and the chiller enters the walk-in environmental chamber through a pipeline and is connected to the heat exchange flow channel in the battery pack, which is used to cool the battery pack. The chiller adjusts the temperature of the battery pack to the ambient temperature of the walk-in environmental chamber, thereby reducing the measurement error. When the temperature of the battery pack reaches the test temperature, the chiller is turned off and the thermal radiation value test of the battery pack is performed.

[0016] Example 2: A method for detecting thermal radiation of a battery pack includes the following steps: S1: The battery pack will be placed in the walk-in environmental chamber and the battery pack charge will be checked; S2: Adjust the temperature of the walk-in environmental chamber so that its internal temperature reaches the predetermined value for the test and maintains dynamic balance; S3: Adjust the temperature of the battery pack to be close to the temperature of the walk-in environmental chamber; S4: Perform charge and discharge tests on the battery pack, recording the energy consumption of the walk-in environmental chamber to maintain a stable temperature during the battery pack charge and discharge process; S5: Perform statistics and calculations on the experimental data results.

[0017] The battery pack was placed in a walk-in environmental chamber, using the battery pack equipped with the BYD Haise 07EV as the test object: battery pack capacity: 80.64KWH; battery pack energy density: 140Wh / kg; battery pack weight: approximately 576KG; battery pack dimensions: 2 meters (length) * 1.2 meters (width) * 0.3 meters (height); battery pack volume: approximately 0.72m³; battery pack surface area: 6.72㎡.

[0018] Connect the chiller to the heat exchange channel of the battery pack, attach multiple patch temperature sensors to the battery surface of the battery pack, and connect the patch temperature sensors to the external control host; connect the charging and discharging equipment to the battery pack; the battery pack thermal radiation detection needs to be carried out at multiple temperatures, and the preset temperatures of the walk-in environmental chamber include 25℃, 0℃ and -20℃; when the preset temperature of the walk-in environmental chamber is 25℃, set the manual forced cooling capacity to 75% so that the walk-in environmental chamber reaches a dynamic equilibrium state of cold and heat confrontation and maintains it at 25℃; when the preset temperature of the walk-in environmental chamber is 0℃, set the manual forced cooling capacity to 100% so that the walk-in environmental chamber reaches a dynamic equilibrium state of cold and heat confrontation and maintains it at 0℃; when the preset temperature of the walk-in environmental chamber is -20℃, set the manual forced cooling capacity to 100% so that the walk-in environmental chamber reaches a dynamic equilibrium state of cold and heat confrontation and maintains it at - 20℃; the temperature of the battery pack is controlled by an external chiller so that its temperature is stable and close to the preset setting of the walk-in environmental chamber, and the temperature error is ensured to be less than ±2℃; when the preset temperature of the walk-in environmental chamber is 25℃, the battery pack is charged and tested, and the change in heating energy consumption of the walk-in environmental chamber after the battery is fully charged is recorded; when the preset temperature of the walk-in environmental chamber is 0℃, the battery pack is discharged and the change in heating energy consumption of the walk-in environmental chamber after the battery is fully charged is recorded; when the preset temperature of the walk-in environmental chamber is -20℃, the battery pack is discharged and the change in heating energy consumption of the walk-in environmental chamber after the battery is fully charged is recorded; the heat dissipation power of the battery pack for charging or discharging at the corresponding temperature is calculated based on the difference between the heating power consumption in the thermal equilibrium state of the walk-in environmental chamber before the test and the heating power consumption of the walk-in environmental chamber during the charging and discharging process of the battery pack; the thermal radiation during the charging and discharging process is calculated based on the heat dissipation power.

[0019] Table 1: Energy consumption data of entering the environmental chamber during charging and discharging The data recorded in Table 1 can be used to calculate the heat dissipated in the environmental chamber during battery pack charging and discharging. The static heating output in Table 1 refers to the heating output state of the walk-in environmental chamber to maintain the set temperature when the battery pack is in a static state; the static average energy consumption in Table 1 refers to the average energy consumption generated by the walk-in environmental chamber to maintain the set temperature when the battery pack is in a static state; the charge and discharge heating output in Table 1 refers to the heating output state of the walk-in environmental chamber to maintain the set temperature when the battery pack is in a charging and discharging state; and the charge and discharge average energy consumption in Table 1 refers to the average energy consumption generated by the walk-in environmental chamber to maintain the set temperature during the battery pack charging and discharging process. Calculations based on the data in Table 1 yield the following results: 25°C charging average radiant power test data: 25°C charging heat dissipation energy consumption difference (average static energy consumption - average charge and discharge energy consumption): W = 12.72 KWh - 12.42 KWh = 0.3 KWh. According to the formula for converting power consumption to power: P = W / T, where P is power, W is energy consumption, and T is time, the formula is: P = 0.3KWh / 1H = 0.3KW = 300W. That is, during the 25°C charging process, the battery pack heat radiation power is approximately 300W.

[0020] 0℃ discharge average radiant power test data: 0℃ charging heat dissipation energy consumption difference (average static energy consumption - average charge and discharge energy consumption): W = 17.94 KWh - 17.28 KWh = 0.66 KWh. According to the formula for converting power consumption to power: P = W / T, where P is power, W is energy consumption, and T is time, the formula is substituted into the calculation to obtain: P = 0.66KWh / 1H = 0.66KW = 660W. That is, during the 0℃ charging process, the battery pack heat radiation power is approximately 660W.

[0021] -20℃ discharge average radiation power test data: -20℃ charging heat dissipation energy consumption difference (average static energy consumption - average charging and discharging energy consumption): W = 16.8 KWh - 16.08 KWh = 0.72 KWh. According to the formula for converting power consumption to power: P = W / T, where P is power, W is energy consumption, and T is time, the formula is substituted into the calculation to obtain: P = 0.72KWh / 1H = 0.72KW = 720W, that is: during the -20℃ charging process, the battery pack heat radiation power is approximately 720W.

[0022] Furthermore, the use of terms such as "horizontal" and "vertical" in the description of the present invention does not necessarily imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical" and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0023] It should also be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific contexts.

[0024] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A battery pack thermal radiation detection system, characterized in that: include: A walk-in environmental chamber, wherein the walk-in environmental chamber is provided with a temperature control module and a load reading module; The temperature control module is used to control the temperature of the walk-in environmental chamber; the load reading module is used to read and record the load value of the walk-in environmental chamber; A temperature measurement module is attached to the surface of the battery pack and is used to measure the temperature of the battery pack; A cooling module, the cooling module being used to adjust an initial measurement temperature of the battery pack; A charge and discharge module is used to charge or discharge the batteries in the battery pack.

2. The battery pack thermal radiation detection system according to claim 1, wherein: The temperature control module includes a refrigeration unit and a heating unit, and the refrigeration unit and the heating unit cooperate to cool or heat the walk-in environmental chamber to achieve intelligent temperature control.

3. The battery pack thermal radiation detection system according to claim 1, wherein: The load reading module includes a multifunctional electric energy meter, which is electrically connected to the walk-in environmental chamber and is used to record energy consumption changes when the walk-in environmental chamber tests the battery pack.

4. The battery pack thermal radiation detection system according to claim 1, wherein: The cooling module includes a chiller, which is arranged outside the walk-in environmental chamber. The chiller enters the walk-in environmental chamber through a pipeline and is connected to the heat exchange flow channel in the battery pack to cool the battery pack.

5. A method for detecting thermal radiation of a battery pack, characterized in that: The following steps are involved: S1: The battery pack will be placed in the walk-in environmental chamber and the battery pack charge will be checked; S2: Adjust the temperature of the walk-in environmental chamber so that its internal temperature reaches the predetermined value for the test and maintains dynamic balance; S3: Adjust the temperature of the battery pack to be close to the temperature of the walk-in environmental chamber; S4: Perform charge and discharge tests on the battery pack, recording the energy consumption of the walk-in environmental chamber to maintain a stable temperature during the battery pack charge and discharge process; S5: Perform statistics and calculations on the experimental data results.

6. The method for detecting thermal radiation of a battery pack according to claim 5, wherein: In step S1, the battery pack is placed in a walk-in environmental chamber, and the chiller is connected to the heat exchange channel of the battery pack. Multiple patch temperature sensors are attached to the battery surface of the battery pack, and the patch temperature sensors are connected to the external control host; the charging and discharging equipment is connected to the battery pack.

7. The method for detecting thermal radiation of a battery pack according to claim 5, wherein: In step S2, the thermal radiation amount of the battery pack needs to be detected at multiple temperatures. The preset temperatures of the walk-in environmental chamber include 25°C, 0°C and -20°C; when the preset temperature of the walk-in environmental chamber is 25°C, the manual forced cooling capacity is set to 75%, so that the walk-in environmental chamber reaches a dynamic equilibrium state of cold and heat confrontation and is maintained at 25°C; when the preset temperature of the walk-in environmental chamber is 0°C, the manual forced cooling capacity is set to 100%, so that the walk-in environmental chamber reaches a dynamic equilibrium state of cold and heat confrontation and is maintained at 0°C; when the preset temperature of the walk-in environmental chamber is -20°C, the manual forced cooling capacity is set to 100%, so that the walk-in environmental chamber reaches a dynamic equilibrium state of cold and heat confrontation and is maintained at -20°C.

8. The method for detecting thermal radiation of a battery pack according to claim 7, wherein: In step S3, the battery pack is temperature-controlled by an external chiller so that its temperature is close to the preset temperature of the walk-in environmental chamber and the temperature error is less than ±2°C.

9. The method for detecting thermal radiation of a battery pack according to claim 7, wherein: In step S4, when the preset temperature of the walk-in environmental chamber is 25°C, the battery pack is charged and tested, and the change in heating energy consumption of the walk-in environmental chamber after the battery is fully charged is recorded; when the preset temperature of the walk-in environmental chamber is 0°C, the battery pack is discharged and tested, and the change in heating energy consumption of the walk-in environmental chamber after the battery is fully charged is recorded; when the preset temperature of the walk-in environmental chamber is -20°C, the battery pack is discharged and tested, and the change in heating energy consumption of the walk-in environmental chamber after the battery is fully charged is recorded.

10. The method for detecting thermal radiation of a battery pack according to claim 9, wherein: In step S5, the heat dissipation power of the battery pack for charging or discharging at the corresponding temperature is calculated based on the difference between the heating power consumption in the thermal equilibrium state before the walk-in environmental chamber test and the heating power consumption in the walk-in environmental chamber during the charging and discharging process of the battery pack; the thermal radiation during the charging and discharging process is calculated based on the heat dissipation power.

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