A control device

Abstract

The utility model provides a kind of control device, it is applied to battery pack thermal runaway test system;Battery pack thermal runaway test system includes heating device and target cooling device;Target cooling device surrounds battery pack;Heating device includes the first heating device and the second heating device of parallel connection;One end of battery pack is connected with the first heating device, other end is connected with the second heating device;The first heating device and the second heating device are used to heat battery pack;Control device is connected with heating device and target cooling device respectively;The first heating device and the second heating device are used to heat battery pack;Target cooling device is opened by control device control, to cool battery pack.

Description

Technical Field

[0001] This utility model relates to the field of battery testing technology, specifically to a control device. Background Technology

[0002] During the thermal runaway test of the battery pack, the battery pack is continuously heated, and the battery temperature gradually increases. When the internal temperature of the battery pack rises to a certain level, the thermal runaway conditions of the battery pack are triggered. However, if the thermal runaway conditions of the battery pack are triggered, there is a risk of fire and loss of control. Utility Model Content

[0003] The embodiments of this utility model provide a control device that can solve the technical problem of fire runaway risk when the battery pack triggers thermal runaway conditions.

[0004] An embodiment of this utility model provides a control device applied to a battery pack thermal runaway testing system. The battery pack thermal runaway testing system includes a heating device and a target cooling device. The target cooling device surrounds the battery pack. The heating device includes at least a first heating element and a second heating element connected in parallel. One end of the battery pack is connected to the first heating element, and the other end is connected to the second heating element. The first heating element and the second heating element are used to heat the battery pack. The control device is connected to both the heating device and the target cooling device. The control device controls the target cooling device to be in an "on" state to cool the battery pack.

[0005] Here, by monitoring the temperature of the battery pack, and when the temperature meets the preset thermal runaway conditions, environmental parameters related to the battery pack can be obtained. This allows the use of environmental parameters as an early influencing factor for activating the cooling device, avoiding the delay limitation of relying solely on temperature to determine the activation of the cooling device. By determining the state information of the environment in which the battery pack is located based on the environmental parameters and a pre-trained prediction model, the environmental state can be evaluated based on a machine learning model, avoiding misjudgment of fire runaway risk and the waste of cooling device resources. When the state information indicates that the environment in which the battery pack is located is in an abnormal state, the target cooling device can be activated based on the temperature of the battery pack. Compared with a single temperature signal or a single environmental parameter, this can improve the accuracy of fire runaway risk assessment, thereby solving the technical problem of fire runaway risk when the battery pack triggers thermal runaway conditions.

[0006] In one embodiment, the target cooling device includes at least a first cooling device disposed in the circumferential peripheral space of the battery pack. The first cooling device is used to cool the exterior of the battery pack. The first cooling device is connected to the control device. The temperature of the battery pack includes a first temperature parameter. The control device controls the first cooling device to be in an on state.

[0007] Here, environmental parameters are used as factors influencing the activation of the cooling device, while the first external temperature parameter of the battery pack is monitored. By combining environmental and temperature parameters, multiple protections are provided against the risk of fire runaway, thus more effectively controlling the risk of fire runaway of the battery pack.

[0008] In one embodiment, the target cooling device further includes a second cooling device disposed in the internal space of the battery pack, the second cooling device being used to cool the interior of the battery pack; the second cooling device is connected to the control device; the temperature of the battery pack also includes a second temperature parameter; the control device controls the second cooling device in the battery pack to be in an open state.

[0009] Here, when the temperature meets the preset thermal runaway conditions, by monitoring the second temperature parameter inside the battery pack, determining whether to activate the second cooling device based on the value of the second temperature parameter, and determining whether to acquire environmental parameters related to the battery pack based on the duration the second cooling device is in the activated state, it is possible to achieve a rapid response to the fire runaway risk inside the battery pack in the early stages of the fire runaway risk. Furthermore, when the cooling device inside the battery pack cannot effectively cool the battery pack, the environmental parameters are used as an influencing factor for activating the cooling device, providing multiple protections against the fire runaway risk and more effectively controlling the fire runaway risk of the battery pack.

[0010] In one embodiment, the target cooling device further includes a third cooling device disposed in the top peripheral space of the battery pack. The third cooling device is used to spray and cool the battery pack. The third cooling device is connected to the control device. The control device controls the third cooling device to be in an open state.

[0011] Here, when the temperature meets the preset thermal runaway conditions, the system determines whether the external temperature of the battery pack has been cooled to below the target temperature threshold where there is no risk of fire runaway based on the duration the first cooling device is in the on state. If the external cooling device cannot effectively cool the battery pack, the system controls the third cooling device to be in the on state to spray and cool the battery pack, providing multiple protections against the risk of fire runaway and more effectively controlling the risk of fire runaway of the battery pack.

[0012] In one embodiment, the control device includes a heating component for controlling the heating power of the heating device, and the heating device is connected to the heating component.

[0013] Here, after setting a temperature rise rate threshold, if the detected temperature rise rate is lower than the threshold, the output power will be increased through the heating component, such as by increasing voltage and current. If the detected temperature rise rate is higher than the threshold, the power will be reduced through the heating component. This adaptively maintains the predetermined temperature rise rate, improving the accuracy of battery pack thermal runaway testing.

[0014] In one embodiment, the first heating device is disposed at a first end of a cell in the battery pack; the second heating device is disposed at a second end of a cell in the battery pack; the first end and the second end are opposite ends of a cell in the battery pack.

[0015] Here, by setting heating devices at the corresponding ends of the cells in the battery pack to conduct thermal runaway tests, the two ends of the cells in the battery pack are heated simultaneously, which effectively improves the efficiency of battery thermal runaway testing.

[0016] In one embodiment, the battery pack thermal runaway test system further includes a first temperature sensor for detecting a first temperature value of a cell in the battery pack and a second temperature sensor for detecting a second temperature value of a cell in the battery pack. The first temperature sensor is disposed at a first end of a cell in the battery pack, and the second temperature sensor is disposed at a second end of a cell in the battery pack.

[0017] Here, by setting temperature sensors at corresponding ends of the cells to monitor the temperature of the cells in the battery pack, the thermal imbalance at both ends of the cells in the battery pack can be effectively monitored, thus improving the accuracy of thermal runaway testing.

[0018] In one embodiment, the first heating power of the first heating device is greater than the second heating power of the second heating device.

[0019] Here, by controlling the temperature rise rate of the heating devices at both ends of the battery cell in the battery pack to be the same or different, the temperature at both ends of the battery cell in the battery pack is kept consistent, which effectively improves the accuracy of battery thermal runaway testing.

[0020] In one embodiment, the first heating power of the first heating device is less than or equal to the second heating power of the second heating device.

[0021] Here, by controlling the temperature rise rate of the heating devices at both ends of the battery cell in the battery pack to be the same or different, the temperature at both ends of the battery cell in the battery pack is kept consistent, which effectively improves the accuracy of battery thermal runaway testing.

[0022] In one embodiment, the control device further includes a voltage detection component for acquiring voltage parameters of the battery pack.

[0023] Here, by acquiring the voltage parameters of the battery pack through the voltage detection component, it is possible to help determine whether the battery pack meets the thermal runaway conditions, effectively reducing the delay error of battery thermal runaway testing.

[0024] In embodiments of this invention, by monitoring the temperature of the battery pack and obtaining environmental parameters related to the battery pack when the temperature meets preset thermal runaway conditions, environmental parameters can be used as early influencing factors for activating the cooling device, avoiding the delay limitation of relying solely on temperature to determine the activation of the cooling device. By determining the state information of the environment in which the battery pack is located based on the environmental parameters and a pre-trained prediction model, the environmental state can be evaluated based on a machine learning model, avoiding misjudgment of fire runaway risk and resulting in wasted resources of the cooling device. By controlling the target cooling device to the on state based on the temperature of the battery pack when the state information indicates that the environment in which the battery pack is located is in an abnormal state, compared to a single temperature signal or a single environmental parameter, the accuracy of fire runaway risk assessment is improved, thereby solving the technical problem of fire runaway risk when the battery pack triggers thermal runaway conditions. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 A schematic diagram showing the connection between the control device and the battery pack thermal runaway test system provided in an embodiment of this utility model;

[0027] Figure 2 Another connection diagram of the control device and the battery pack thermal runaway test system provided in the embodiments of this utility model;

[0028] Figure 3 A flowchart illustrating a control method provided in an embodiment of this utility model. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0030] Figure 1 A schematic diagram showing the connection between the control device and the battery pack thermal runaway test system provided in an embodiment of this utility model is shown below. Figure 1 As shown, the control device 100 is applied to the battery pack thermal runaway test system 200; the battery pack thermal runaway test system 200 includes a heating device 210 and a target cooling device 220; the target cooling device 220 surrounds the battery pack 300; the heating device 210 includes at least a first heating element 211 and a second heating element 212 connected in parallel; one end of the battery pack 300 is connected to the first heating element 211 and the other end is connected to the second heating element 212; the first heating element 211 and the second heating element 212 are used to heat the battery pack 300; the control device 100 is connected to the heating device 210 and the target cooling device 220 respectively.

[0031] The control device 100 is used to monitor the temperature of the battery pack 300; when the temperature meets the preset thermal runaway conditions, it acquires environmental parameters related to the battery pack 300; based on the environmental parameters and temperature, it controls the target cooling device 220 to be turned on; the target cooling device 220 is used to cool the battery pack 300 so that the temperature of the battery pack 300 is less than or equal to the preset target temperature threshold.

[0032] For example, the battery pack 300 may include multiple modules. The target cooling device 220 surrounding the battery pack 300 can be understood as the target cooling device 220 being disposed in the internal space, the circumferential external space, or the top external space of the battery pack 300, cooling the battery pack 300 from multiple directions. The first heating device 211 can be a first heating element; the second heating device 212 can be a second heating element. The first heating element and the second heating element can be attached to both ends of the battery pack 300. It can be understood that one end of the battery pack 300 is disposed opposite to the other end.

[0033] For example, the battery pack thermal runaway testing system 200 may further include a temperature detection device for real-time acquisition of the temperature of the battery pack 300, and the control device 100 may monitor the temperature of the battery pack 300 through the temperature detection device. The battery pack thermal runaway testing system 200 may also include an environmental detection device, such as a photoelectric detector, an electrochemical sensor, and an infrared absorption sensor. Environmental parameters include at least one of smoke concentration, gas composition, and gas concentration. Specifically, monitoring smoke concentration can be achieved by detecting the concentration of particles in the environment using a photoelectric detector; monitoring gas composition can be achieved by detecting the presence of fire-related gases, such as carbon monoxide, in the environment using an electrochemical sensor; and monitoring gas concentration can be achieved by detecting the concentration of carbon dioxide in the environment using an infrared absorption sensor.

[0034] Here, by monitoring the temperature of the battery pack 300, when the temperature meets the preset thermal runaway conditions, environmental parameters related to the battery pack 300 can be obtained. This allows the use of environmental parameters as an influencing factor for the early activation of the cooling device, avoiding the delay limitation of relying solely on temperature to determine the activation of the cooling device.

[0035] Here, by controlling the target cooling device 220 based on environmental parameters and the temperature of the battery pack 300 to be in the on state, the temperature of the battery pack 300 is cooled to below the target temperature threshold where there is no risk of fire runaway. Compared with a single temperature signal or a single environmental parameter, this can improve the accuracy of fire runaway risk assessment.

[0036] In some embodiments, the target cooling device 220 is turned on based on environmental parameters and temperature control, which can determine the state information of the environment in which the battery pack 300 is located based on environmental parameters and a pre-trained prediction model. When the state information indicates that the environment in which the battery pack 300 is located is in an abnormal state, the target cooling device 220 is turned on based on the temperature control of the battery pack 300, so that the temperature of the battery pack 300 is less than or equal to a preset target temperature threshold.

[0037] In one embodiment, Figure 2 Another connection diagram of the control device and the battery pack thermal runaway test system provided for an embodiment of this utility model is shown below. Figure 2 As shown, the target cooling device 220 includes at least a first cooling device 221, which is disposed in the circumferential outer space of the battery pack 300. The first cooling device 221 is used to cool the outside of the battery pack 300. The first cooling device 221 is connected to the control device 100. The temperature of the battery pack 300 includes a first temperature parameter.

[0038] The control device 100 is also used to acquire a first temperature parameter of the battery pack 300; when the value of the first temperature parameter is greater than or equal to a preset first temperature threshold, the first cooling device 221 is controlled to be turned on so that the temperature of the battery pack 300 is less than or equal to the target temperature threshold; the first temperature threshold is greater than the target temperature threshold.

[0039] For example, the control device 100 includes at least a control component, which may be a host computer 110. The host computer may include software that can display a temperature rise curve in real time based on the temperature rise rate uploaded by the battery pack thermal runaway test system 200. The first cooling device 221 can be connected and communicated with the host computer 110. Figure 2 The first cooling device 221 can be disposed in the circumferential direction of the battery pack 300. Specifically, the first cooling device 221 can be disposed at any position in the direction of the axis around the battery pack 300. It can be understood that the first cooling device 221 is disposed around the outside of the battery pack 300 and is used to cool the outside of the battery pack 300.

[0040] For example, the temperature detection device further includes a first temperature detector, which is disposed outside the battery pack 300 and is used to acquire a first temperature parameter of the battery pack 300. The first temperature threshold can be the minimum temperature value at which there is a potential risk of fire runaway outside the battery pack 300, and is not limited thereto. The first cooling device 221 can be a fire extinguishing device outside the battery pack 300. The fire extinguishing device is an external device at the test location, extending from the wall to the outside, with the nozzle aimed at the test sample. The fire extinguishing device automatically identifies the flame and sprays extinguishing agent to ensure the safety of personnel and property.

[0041] For example, when the value of the first temperature parameter is greater than or equal to a preset first temperature threshold, indicating a potential risk of fire runaway outside the battery pack 300, the first cooling device 221 outside the battery pack 300 is activated to cool the exterior of the battery pack 300, so that the temperature of the battery pack 300 is less than or equal to the preset target temperature threshold. The first cooling device 221 can be activated in response to a control command from the control device 100, and is not limited here. It is understood that the minimum temperature value at which a fire runaway risk exists outside the battery pack 300 is at least greater than the maximum temperature value at which no fire runaway risk exists.

[0042] Here, environmental parameters are used as factors affecting the activation of the cooling device, while the first external temperature parameter of the battery pack 300 is monitored. By combining environmental and temperature parameters, multiple protections are provided against the risk of fire runaway, thus more effectively controlling the risk of fire runaway of the battery pack 300.

[0043] In one embodiment, such as Figure 2As shown, the target cooling device 220 also includes a second cooling device 222, which is disposed inside the battery pack 300. The second cooling device 222 is used to cool the inside of the battery pack 300. The second cooling device 222 is connected to the control device 100. The temperature of the battery pack 300 also includes a second temperature parameter. The control device 100 is also used to acquire the second temperature parameter of the battery pack 300. When the value of the second temperature parameter is greater than or equal to a preset second temperature threshold, the control device 100 determines that the second cooling device 222 inside the battery pack 300 is in an on state. The second temperature threshold is greater than the target temperature threshold. The control device 100 also acquires a first duration for which the second cooling device 222 is in an on state. When the first duration is greater than or equal to the preset first threshold, the control device 100 determines the environmental parameters.

[0044] For example, the second cooling device 222 can be communicatively connected to the host computer 110. Figure 2 The image is not shown. The temperature detection device also includes a second temperature detector, which is disposed inside the battery pack 300 and is used to acquire a second temperature parameter of the battery pack 300. The second temperature threshold can be the minimum temperature value at which there is a potential risk of fire runaway inside the battery pack 300, and is not limited here. The second cooling device 222 can be a fire extinguishing device inside the battery pack 300, and is not limited here.

[0045] For example, when the value of the second temperature parameter is greater than or equal to a preset second temperature threshold, it indicates that there may be a risk of fire runaway inside the battery pack 300. The second cooling device 222 inside the battery pack 300 is activated to cool the interior of the battery pack 300 so that the temperature of the battery pack 300 is less than or equal to the preset target temperature threshold. The second cooling device 222 can be activated in response to a control command from the control device 100 or in response to a control command from the battery pack 300; this is not limited to either specific actions.

[0046] The target temperature threshold can be the maximum temperature value at which the battery pack 300 does not have a risk of fire runaway. It can be understood that the minimum temperature value at which the battery pack 300 has a risk of fire runaway is at least greater than the maximum temperature value at which there is no risk of fire runaway.

[0047] For example, the control device 100 also includes a hardware timer, which can be triggered based on a first cooling signal to accumulate the duration for which the second cooling device 222 is in the on state, thus obtaining a first duration. The first cooling signal can be a signal generated by the control device 100 when the value of a second temperature parameter is greater than or equal to a preset second temperature threshold.

[0048] For example, the first threshold can be the longest duration for which the second cooling device 222 inside the battery pack 300 operates alone. As an example, the first threshold can be 15-20 seconds. When the first duration is greater than or equal to the preset first threshold, the value of the second temperature parameter characterizing the inside of the battery pack 300 is still greater than the second temperature threshold, and there is still a risk of fire runaway inside the battery pack 300. At this time, it is necessary to obtain environmental parameters.

[0049] Here, when the temperature meets the preset thermal runaway conditions, by monitoring the second temperature parameter inside the battery pack 300, determining whether to activate the second cooling device 222 based on the value of the second temperature parameter, and determining whether to acquire environmental parameters related to the battery pack 300 based on the duration the second cooling device 222 is in the activated state, it is possible to achieve a rapid response to the fire runaway risk inside the battery pack 300 in the early stages of the fire runaway risk. Furthermore, when the cooling device inside the battery pack 300 cannot effectively cool the battery pack 300, the environmental parameters are used as an influencing factor for activating the cooling device, providing multiple protections against the fire runaway risk and more effectively controlling the fire runaway risk of the battery pack 300.

[0050] In one embodiment, such as Figure 2 As shown, the target cooling device 220 also includes a third cooling device 223, which is disposed in the top peripheral space of the battery pack 300. The third cooling device 223 is used to spray and cool the battery pack 300; the third cooling device 223 is connected to the control device 100.

[0051] The control device 100 is also used to obtain a second duration during which the first cooling device 221 is in the on state; when the second duration is greater than or equal to a preset second threshold, the control device 223 is turned on so that the temperature of the battery pack 300 is less than or equal to the target temperature threshold.

[0052] For example, the third cooling device 223 can be connected and communicated with the host computer 110. Figure 2 (Not shown). A hardware timer is triggered by a second cooling signal to accumulate the duration for which the first cooling device 221 is in the on state, resulting in a second duration. The second cooling signal can be a signal generated by the control device 100 when the value of the first temperature parameter is greater than or equal to a preset first temperature threshold.

[0053] For example, the second threshold can be the longest duration for which the first cooling device 221 outside the battery pack 300 operates alone. The second threshold can be the same as or different from the first threshold, and this is not limited here. When the second duration is greater than or equal to the preset second threshold, the value of the first temperature parameter representing the outside of the battery pack 300 is still greater than the first temperature threshold, and there is still a risk of fire runaway outside the battery pack 300. At this time, it is necessary to control the third cooling device 223 to be turned on so that the temperature of the battery pack 300 is cooled to below the target temperature threshold where there is no risk of fire runaway.

[0054] Here, when the temperature meets the preset thermal runaway conditions, the system determines whether the external temperature of the battery pack 300 has been cooled to below the target temperature threshold where there is no risk of fire runaway based on the duration the first cooling device 221 is in the on state. If the external cooling device of the battery pack 300 cannot effectively cool the battery pack 300, the system controls the third cooling device 223 to be in the on state to spray and cool the battery pack 300, thus providing multiple protections against the risk of fire runaway and more effectively controlling the risk of fire runaway of the battery pack 300.

[0055] In some embodiments, the temperature detection device further includes a third temperature detector, which is disposed outside the battery pack 300 and is used to obtain a third temperature parameter of the battery pack 300; if the third temperature parameter is greater than or equal to a third temperature threshold, the third fire extinguishing device is controlled to switch to the open state; in order to activate the third cooling device 223 when the temperature outside the battery pack 300 further increases, the third temperature threshold is greater than or equal to the first temperature threshold.

[0056] Here, when the temperature meets the preset thermal runaway conditions, the system determines whether the external temperature of the battery pack 300 has cooled to below the target temperature threshold where there is no risk of fire runaway based on the duration the first cooling device 221 is in the on state. If the external cooling device of the battery pack 300 cannot effectively cool the battery pack 300 or the fire is not completely controlled / has a tendency to spread, the system controls the third cooling device 223 to be in the on state to spray and cool the battery pack 300, providing multiple protections against the risk of fire runaway and more effectively controlling the risk of fire runaway of the battery pack 300.

[0057] In one embodiment, such as Figure 2 As shown, the control device 100 includes a heating component 120 for controlling the heating power of the heating device 210, and the heating device 210 is connected to the heating component 120.

[0058] For example, the heating component 120 can be a heating instrument, which is not limited here. The heating component 120 can be connected and communicated with the host computer 110 to transmit the temperature rise rate of the heating device 210 to the host computer.

[0059] Here, after setting the temperature rise rate threshold, if the detected temperature rise rate is lower than the temperature rise rate threshold, the output power will be increased through the heating component 120, such as by increasing voltage and current. If the detected temperature rise rate is higher than the temperature rise rate threshold, the power will be reduced through the heating component 120. This adaptively maintains the predetermined temperature rise rate, thereby improving the accuracy of the thermal runaway test of the battery pack 300.

[0060] In one embodiment, such as Figure 2 As shown, the first heating device 211 is disposed at the first end of the battery cell 310 in the battery pack 300; the second heating device 212 is disposed at the second end of the battery cell 310 in the battery pack 300; the first end and the second end are the two opposite ends of the battery cell 310 in the battery pack 300.

[0061] For example, the battery cell 310 in the battery pack 300 can be a trigger cell. A trigger cell typically refers to a specific cell that reaches a preset trigger condition, thereby triggering a corresponding system response, which is not limited here. The first heating device 211 can be a first heating element; the second heating device 212 can be a second heating element. The first heating element and the second heating element can be attached to both ends of the battery cell 310 in the battery pack 300. It can be understood that one end of the battery cell 310 in the battery pack 300 is arranged opposite to the other end.

[0062] Here, by setting heating devices at the corresponding ends of the battery cell 310 in the battery pack 300 to conduct thermal runaway testing, the two ends of the battery cell 310 in the battery pack 300 are heated simultaneously, which effectively improves the efficiency of battery thermal runaway testing.

[0063] In one embodiment, the battery pack thermal runaway test system 200 further includes a first temperature sensor and a second temperature sensor. The first temperature sensor is disposed at a first end of the battery cell 310 in the battery pack 300, and the second temperature sensor is disposed at a second end of the battery cell 310 in the battery pack 300. The first temperature sensor is used to detect a first temperature value of the battery cell 310 in the battery pack 300, and the second temperature sensor is used to detect a second temperature value of the battery cell 310 in the battery pack 300.

[0064] Here, by setting temperature sensors at the corresponding ends of the cell 310, the temperature value of the cell 310 in the battery pack 300 is monitored, which effectively monitors whether thermal imbalance occurs at the two ends of the cell 310 in the battery pack 300 and improves the accuracy of thermal runaway testing.

[0065] In one embodiment, when the first temperature value is less than the second temperature value, the first heating power of the first heating device 211 is greater than the second heating power of the second heating device 212.

[0066] For example, if the first temperature value is less than or equal to the second temperature value, it indicates that the temperature of the first end of the cell 310 in the battery pack 300 is less than or equal to the temperature of the second end of the cell 310 in the battery pack 300, and the cell 310 in the battery pack 300 has a defect of uneven heating. Therefore, the first heating power of the first heating device 211 is controlled to be greater than or equal to the second heating power of the second heating device 212. By increasing the first heating power of the first heating device 211, the temperature of the first end of the cell 310 in the battery pack 300 gradually rises until it is consistent with the temperature of the second end of the cell 310 in the battery pack 300.

[0067] Here, by controlling the temperature rise rate of the heating devices at both ends of the battery cell 310 in the battery pack 300 to be the same or different, the temperature at both ends of the battery cell 310 in the battery pack 300 is kept consistent, which effectively improves the accuracy of battery thermal runaway testing.

[0068] In one embodiment, when the first temperature value is greater than the second temperature value, the first heating power of the first heating device 211 is less than or equal to the second heating power of the second heating device 212.

[0069] For example, if the first temperature value is greater than the second temperature value, it indicates that the temperature of the first end of the battery cell 310 in the battery pack 300 is greater than the temperature of the second end of the battery cell 310 in the battery pack 300, and the battery cell 310 in the battery pack 300 has a defect of uneven heating. Therefore, the first heating power of the first heating device 211 is controlled to be less than the second heating power of the second heating device 212. By increasing the second heating power of the second heating device 212, the temperature of the second end of the battery cell 310 in the battery pack 300 gradually rises until it is consistent with the temperature of the first end of the battery cell 310 in the battery pack 300.

[0070] Here, by controlling the temperature rise rate of the heating devices at both ends of the battery cell 310 in the battery pack 300 to be the same or different, the temperature at both ends of the battery cell 310 in the battery pack 300 is kept consistent, which effectively improves the accuracy of battery thermal runaway testing.

[0071] In one embodiment, the control device 100 further includes a voltage detection component for acquiring voltage parameters of the battery pack 300.

[0072] Here, by acquiring the voltage parameters of the battery pack 300 through the voltage detection component, it is possible to help determine whether the battery pack 300 meets the thermal runaway conditions, effectively reducing the delay error of battery thermal runaway testing.

[0073] In some embodiments, the voltage value of the battery pack 300 can be obtained, and the voltage value can be compared with a voltage threshold to obtain a voltage comparison result. Based on the voltage comparison result, it can be determined whether the voltage meets the thermal runaway condition. Specifically, if the voltage comparison result indicates that the voltage value is less than or equal to the voltage threshold, it is determined that the voltage meets the thermal runaway condition; if the voltage comparison result indicates that the voltage value is greater than the voltage threshold, it is determined that the voltage does not meet the thermal runaway condition. The voltage threshold can be 1V.

[0074] The control method provided by the embodiments of this utility model is described below.

[0075] In related technologies, most methods for testing the thermal runaway of battery packs involve manually adjusting instruments to heat the trigger cells. The main drawbacks and shortcomings of these methods are: First, limitations: manually adjusting the instruments requires personnel to constantly correct the output power of the instruments, which is labor-intensive; Second, insufficient accuracy: relying on visual identification of the temperature rise rate and manually adjusting the heating instruments will result in a large number of errors, which will prolong the thermal runaway time of the trigger cells and increase the risk.

[0076] Figure 3 A flowchart illustrating a control method provided for an embodiment of this utility model is shown below. Figure 3 As shown, the control method includes the following steps:

[0077] Step 301: Two heating elements are attached to the trigger cell inside the battery pack. The two heating elements are connected in parallel and extend out from inside the battery pack.

[0078] For example, the heating element can be attached to the trigger cell before thermal runaway detection of the battery pack.

[0079] Step 302: Place the battery pack or module on the test bench and connect the heating element wiring harness into the instrument.

[0080] For example, a test bench can be built based on a battery pack or module, a test bench, and a heating element.

[0081] Step 303: The temperature of the heating element is transmitted to the heating instrument interface in real time. After setting the temperature rise rate threshold, if the temperature rise rate is detected to be lower than the temperature rise rate threshold, the output power will be increased, for example, by increasing voltage and current. If the temperature rise rate is detected to be higher than the temperature rise rate threshold, the power will be reduced. The system will continuously and adaptively maintain the predetermined temperature rise rate.

[0082] For example, the temperature of the heating element is automatically controlled by a heating instrument to maintain the temperature rise rate of the heating element at a set temperature rise rate threshold.

[0083] Step 304: The temperature rise rate is transmitted to the host computer, and the temperature rise curve is displayed in real time on the host computer software. After the thermal runaway judgment condition is triggered, the heating device is automatically controlled to stop heating.

[0084] For example, the host computer integrates data such as the temperature rise rate at each moment to obtain a temperature rise curve.

[0085] Step 305: The high-voltage line monitors the total voltage of the battery pack throughout the process to record voltage data.

[0086] For example, voltage data can help determine whether a battery pack meets the conditions for thermal runaway.

[0087] Step 306: The temperature rise curve is exported from the host computer, which can be used to analyze the comparison between heating power and battery pack reaction and evaluate the safety value of the battery pack.

[0088] For example, data analysis can be performed based on the temperature rise curve to assess the safety value of the battery pack, such as the thermal runaway threshold.

[0089] In this embodiment of the invention, when the temperature rise rate of the battery cell is detected to be greater than 3℃ / s, in order to improve safety and accuracy, the environmental parameters and a pre-trained prediction model are used to determine the state information of the environment in which the battery pack is located to detect whether the battery cell is abnormal. If abnormal, it is determined whether the battery cell temperature has reached the temperature threshold. If the temperature reaches the temperature threshold, the fire extinguishing device is activated to extinguish the fire. Automatic flame identification is assisted by a built-in sensor. After identifying the flame, gas or dry powder is automatically sprayed from inside to extinguish the fire. The fire extinguishing device is linked to an upper spray fire extinguishing device. The top of the battery pack is equipped with a spray fire extinguishing device for cooling, which further suppresses high temperature and reduces the danger to a lower level.

[0090] In some embodiments, the control device can automatically control the temperature rise rate of the cells in the battery pack, and reduce the heating power when the temperature rise rate is higher than a predetermined temperature rise rate threshold, and increase the heating power when the temperature rise rate is lower than the predetermined temperature rise rate threshold; the battery pack thermal runaway test system can determine the battery pack thermal runaway cutoff condition and automatically stop it; it can analyze the comparison between heating power and battery pack response to evaluate the battery pack safety value.

[0091] In some embodiments, the system can solve the problem of judgment error caused by manually controlling battery pack heating to trigger thermal runaway. In addition to controlling the temperature rise rate, the battery pack thermal runaway test system can also determine the thermal runaway cutoff condition of the battery pack and then automatically stop heating, which greatly reduces the workload of personnel and saves labor costs. The battery pack thermal runaway test system has higher long-term stability and greater accuracy. It is suitable for testing related to thermal runaway triggered by heating methods at the battery pack, cell, and even cluster level. It solves the error in the implementation of relevant domestic and overseas standards, and can accumulate data over a long period of time to analyze the comparison between heating power and battery pack response and evaluate the safety value of the battery pack.

[0092] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A control device (100), characterized in that, The system is applied to a battery pack thermal runaway testing system (200); the battery pack thermal runaway testing system (200) includes a heating device (210) and a target cooling device (220); the target cooling device (220) surrounds the battery pack (300); the heating device (210) includes at least a first heating element (211) and a second heating element (212) connected in parallel; one end of the battery pack (300) is connected to the first heating element (211) and the other end is connected to the second heating element (212); the first heating element (211) and the second heating element (212) are used to heat the battery pack (300); the control device (100) is connected to the heating device (210) and the target cooling device (220) respectively; the control device (100) controls the target cooling device (220) to be in the open state to cool the battery pack (300).

2. The control device (100) according to claim 1, characterized in that The target cooling device (220) includes at least a first cooling device (221), which is disposed in the circumferential outer space of the battery pack (300). The first cooling device (221) is used to cool the outside of the battery pack (300). The first cooling device (221) is connected to the control device (100). The temperature of the battery pack (300) includes a first temperature parameter. The control device (100) controls the first cooling device (221) to be in an open state.

3. The control device (100) according to claim 1, characterized in that The target cooling device (220) further includes a second cooling device (222), which is disposed in the internal space of the battery pack (300) and is used to cool the interior of the battery pack (300). The second cooling device (222) is connected to the control device (100). The temperature of the battery pack (300) also includes a second temperature parameter. The control device (100) controls the second cooling device (222) in the battery pack (300) to be in the open state.

4. The control device (100) according to claim 1, characterized in that, The target cooling device (220) further includes a third cooling device (223), which is disposed in the top peripheral space of the battery pack (300). The third cooling device (223) is used to spray the battery pack (300) to cool it down. The third cooling device (223) is connected to the control device (100). The control device (100) controls the third cooling device (223) to be in the open state.

5. The control device (100) according to any one of claims 1 to 4, characterized in that The control device (100) includes a heating component (120) for controlling the heating power of the heating device (210), and the heating device (210) is connected to the heating component (120).

6. The control device (100) according to claim 5, characterized in that The first heating device (211) is disposed at the first end of the cell (310) in the battery pack (300); the second heating device (212) is disposed at the second end of the cell (310) in the battery pack (300); the first end and the second end are the two opposite ends of the cell (310) in the battery pack (300).

7. The control device (100) according to claim 6, characterized in that The battery pack thermal runaway test system (200) further includes a first temperature sensor for detecting a first temperature value of the battery cell (310) in the battery pack (300) and a second temperature sensor for detecting a second temperature value of the battery cell (310) in the battery pack (300). The first temperature sensor is disposed at a first end of the battery cell (310) in the battery pack (300), and the second temperature sensor is disposed at a second end of the battery cell (310) in the battery pack (300).

8. The control device (100) according to claim 6 or 7, characterized in that The first heating power of the first heating device (211) is greater than the second heating power of the second heating device (212).

9. The control device (100) according to claim 6 or 7, characterized in that, The first heating power of the first heating device (211) is less than or equal to the second heating power of the second heating device (212).

10. The control device (100) according to claim 5, characterized in that The control device (100) further includes a voltage detection component for acquiring voltage parameters of the battery pack (300).

Images