Temperature difference regulating device and method for CTP battery pack

Abstract

The application discloses a temperature difference adjusting device and method for a CTP battery pack, and the device comprises an integrated frame, a plurality of integrated liquid cooling cross beams, a plurality of shunt sealing fixing bolts, a plurality of branch flow-through spiral pipes, a plurality of connecting water pipes and a plurality of series water pipes. Each integrated liquid cooling cross beam corresponds to a branch of a liquid cooling system of the CTP battery pack. The branch flow-through spiral pipe is used for separating the integrated liquid cooling cross beam for temperature difference adjustment from the liquid cooling system. The series water pipe is used for connecting the branch flow-through spiral pipes on two adjacent integrated liquid cooling cross beams in an independent loop. The independent loop comprises one or more separated integrated liquid cooling cross beams. The connecting water pipe is used for connecting the branch flow-through spiral pipes on the integrated liquid cooling cross beams on two sides in the independent loop with an external thermal management device. The device can accurately and quickly generate a specified temperature difference between the battery cells, improves the accuracy of the temperature difference adjustment of the battery pack, and reduces the time cost.

Description

Technical Field

[0001] This application relates to the field of CTP battery parameter adjustment technology, and in particular to a temperature difference adjustment device and method for a CTP battery pack. Background Technology

[0002] With the development of cell-to-pack (CTP) technology, CTP battery packs have been widely used in various fields such as electric vehicles. CTP battery packs are usually equipped with liquid cooling systems, and in order to ensure that the thermal management performance of CTP battery packs meets actual requirements, it is necessary to test the thermal management performance of CTP battery packs at specified temperatures.

[0003] In related technologies, whether conducting individual battery pack testing or vehicle integration testing, the method for controlling the temperature of each cell in the battery pack to reach a specified level involves placing the battery pack at the required ambient temperature for an extended period to allow the cells to reach the ambient temperature. However, these methods require a relatively long settling time, and temperature differences exist between the individual cells. Some improvements reduce the settling time by activating additional heating or cooling functions, but temperature differences still exist, requiring further settling after cooling or heating to reduce these differences. Although longer settling times result in smaller temperature differences, practical applications have limitations on the settling time; therefore, a certain degree of temperature difference must ultimately be accepted during testing.

[0004] However, in practical applications, temperature differences have a significant impact on battery performance, thus requiring research into the actual thermal management performance of CTP battery packs under specific temperature differences. However, current technologies cannot create a specified temperature difference between the cells of the battery pack; the temperature difference between cells is random, making it impossible to conduct thermal management performance tests under a defined temperature difference.

[0005] Therefore, how to accurately manufacture the specified temperature difference between battery cells has become an urgent problem to be solved. Summary of the Invention

[0006] The purpose of this application is to at least partially solve one of the aforementioned technical problems.

[0007] Therefore, the first objective of this application is to propose a temperature difference regulation device for CTP battery packs. This device can accurately and quickly create a specified temperature difference between the cells, improving the accuracy of temperature difference regulation in the battery pack, reducing time costs, and facilitating the study of the actual thermal management performance of the battery pack under specified temperature differences.

[0008] The second objective of this application is to propose a method for temperature difference regulation of CTP battery packs.

[0009] The third objective of this application is to provide a non-transitory computer-readable storage medium.

[0010] To achieve the above objectives, a first aspect of this application provides a temperature difference regulation device for a CTP battery pack. This device includes: an integrated frame, multiple integrated liquid-cooled crossbeams, multiple shunt sealing fixing bolts, multiple branch flow-through solenoids, multiple connecting water pipes, and multiple series-connected water pipes; wherein,

[0011] Each of the integrated liquid-cooled crossbeams corresponds to a branch of the CTP battery pack liquid cooling system. The shunt sealing fixing bolts are used to fix the integrated liquid-cooled crossbeams that have not been temperature-differential regulated to the integrated frame so as to allow the CTP battery pack's own coolant circulation.

[0012] The branch flow solenoid is used to independently separate an integrated liquid-cooled crossbeam from the liquid-cooling system for temperature difference regulation;

[0013] The series water pipe is used to connect the branch flow solenoids on two adjacent integrated liquid-cooled crossbeams in an independent circuit, wherein the independent circuit includes one or more independent integrated liquid-cooled crossbeams;

[0014] The connecting water pipe is used to connect the branch flow solenoids on the integrated liquid-cooled crossbeams on both sides of the independent circuit to the external thermal management equipment.

[0015] In addition, the temperature difference regulation device of the CTP battery pack in this application embodiment also has the following additional technical features:

[0016] Optionally, in some embodiments, the branch flow-through solenoid includes: a first step, a first step thread, a second sealing ring, a third sealing ring, a second step, a fourth sealing ring, a bolt head, a solenoid inlet / outlet water pipe, a first connecting channel, and a second connecting channel; wherein, the first step thread is located at the front end of the first step, and the first step thread is used to screw and fix the branch flow-through solenoid onto the corresponding integrated liquid-cooled crossbeam; the second sealing ring is engaged in the groove at the rear section of the first step, the third sealing ring is located at the connection between the first step and the second step, and the fourth sealing ring is located at the connection between the second step and the bolt head; the first connecting channel passes through the solenoid inlet / outlet water pipe, and the second connecting channel passes through the bolt head, the second step, and the first step, and the first connecting channel and the second connecting channel are connected.

[0017] Optionally, in some embodiments, the liquid cooling system includes one or more of the independent loops, each of which is thermally managed and controlled by the external thermal management device; the first connection channel further includes a rubber plug, which is used to block the coolant flowing out after the branch flow solenoid is installed.

[0018] To achieve the above objectives, a second aspect of the present invention provides a method for temperature difference regulation of a CTP battery pack, applied to the temperature difference regulation device of the CTP battery pack described in the first aspect, the method comprising:

[0019] Place the CTP battery pack in the ambient temperature required for thermal management performance testing and obtain the current target temperature difference to be adjusted;

[0020] When the target temperature difference is zero, the temperature difference adjustment device is used to perform temperature equalization processing on the CTP battery pack to adjust the temperature difference between each cell in the CTP battery pack to a preset range.

[0021] When the target temperature difference is greater than zero, the temperature difference adjustment device generates a temperature difference in the CTP battery pack to adjust the difference between the highest and lowest cell temperatures in the CTP battery pack to the target temperature difference.

[0022] In the process of temperature equalization and temperature difference generation in the CTP battery pack, the relevant components in the temperature difference adjustment device construct an independent circuit for the target cell that is individually thermally managed to accelerate the temperature rise or fall of the target cell, or shield the integrated liquid-cooled crossbeam corresponding to the target cell to slow down the temperature rise or fall of the target cell.

[0023] To achieve the above objectives, a third aspect of the present invention provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the temperature difference regulation method for a CTP battery pack as described in any of the second aspect embodiments above.

[0024] The technical solutions provided by the embodiments of this application bring at least the following beneficial effects:

[0025] This application, based on actual temperature difference adjustment requirements, utilizes components such as branch flow solenoids, connecting water pipes, and series water pipes to isolate the integrated liquid-cooled crossbeams of the CTP battery pack from the battery pack's liquid cooling system. This allows for accelerating or slowing down the temperature rise or fall of the relevant cells, creating a specified temperature difference between the cells in the battery pack. Therefore, this application can, on the one hand, accelerate or decelerate the temperature equalization between cells, reducing the battery pack's resting time; on the other hand, it can accelerate or decelerate the creation of a fixed temperature difference between cells, thereby reducing the time required to create the specified temperature difference and lowering the time cost of battery pack testing. Furthermore, this application can precisely create the specified temperature difference between cells, reducing the deviation between the actual and specified temperature differences. This allows for the addition of temperature difference-related tests during battery pack testing, improving the comprehensiveness of battery pack testing and the robustness of thermal management performance. Moreover, because this application can create a precise specified temperature difference, it can improve the accuracy of battery pack test results and ensure their reliability. Therefore, this application improves the accuracy of battery pack temperature difference regulation, reduces time costs, and is beneficial for studying the actual thermal management performance of battery packs under specified temperature differences.

[0026] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0027] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0028] Figure 1 This is a schematic diagram of the structure of a temperature difference regulation device for a CTP battery pack according to an embodiment of this application;

[0029] Figure 2 This is a schematic diagram of another temperature difference regulation device for a CTP battery pack proposed in an embodiment of this application;

[0030] Figure 3 This is a cross-sectional schematic diagram of a diversion sealing fixing bolt proposed in an embodiment of this application;

[0031] Figure 4 This is a schematic diagram of the structure of a branch flow solenoid proposed in an embodiment of this application;

[0032] Figure 5 This is a cross-sectional schematic diagram of a branch flow solenoid proposed in an embodiment of this application;

[0033] Figure 6 This is a schematic diagram of a flow path for an independent loop according to an embodiment of this application;

[0034] Figure 7 This is a schematic diagram of the flow channel of a shielded liquid cooling system proposed in an embodiment of this application;

[0035] Figure 8 This is a schematic diagram of a liquid cooling system under an acceleration scheme proposed in an embodiment of this application;

[0036] Figure 9 This is a schematic diagram of a liquid cooling system under a deceleration scheme proposed in an embodiment of this application.

[0037] Figure 10 This is a flowchart illustrating a temperature difference regulation monitoring method for a CTP battery pack proposed in an embodiment of this application;

[0038] Figure 11 This is a flowchart of a temperature equalization acceleration processing method based on an acceleration method proposed in an embodiment of this application;

[0039] Figure 12 This is a flowchart of a temperature equalization acceleration method based on deceleration proposed in an embodiment of this application;

[0040] Figure 13 A flowchart illustrating a method for manufacturing a target temperature difference based on an accelerated method, as proposed in an embodiment of this application;

[0041] Figure 14 This is a flowchart illustrating a method for manufacturing a target temperature difference based on a deceleration method, as proposed in an embodiment of this application. Detailed Implementation

[0042] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0043] The temperature difference regulation device and method for a CTP battery pack according to embodiments of this application are described below with reference to the accompanying drawings.

[0044] Figure 1 This is a schematic diagram of the structure of a temperature difference regulation device for a CTP battery pack according to an embodiment of this application. Figure 2 This is a schematic diagram of another temperature difference regulation device for a CTP battery pack proposed in an embodiment of this application, as shown below. Figure 1 and Figure 2 As shown, the device includes: an integrated frame 10, multiple integrated liquid-cooled crossbeams 20, multiple diversion sealing fixing bolts 30, multiple branch flow solenoids 40, multiple connecting water pipes 50, and multiple series water pipes 60.

[0045] Each integrated liquid-cooled crossbeam 20 corresponds to a branch of the CTP battery liquid cooling system. On one side of the CTP battery pack, each integrated liquid-cooled crossbeam 20 is equipped with a shunt sealing fixing bolt 30 or a branch flow solenoid 40 (the specific configuration depends on whether the branch is individually temperature-adjusted). Both the shunt sealing fixing bolt 30 and the branch flow solenoid 40 have their own sealing structure and are fixed together with the corresponding integrated liquid-cooled crossbeam 20 and integrated frame 10 by screwing.

[0046] The shunt sealing bolt 30 is used to fix the integrated liquid-cooled crossbeam 20 (which is not subject to temperature difference regulation) to the integrated frame 10 to facilitate the coolant circulation of the CTP battery pack itself. The coolant circulates within the channel formed by the integrated frame 10, the integrated liquid-cooled crossbeam 20, and the shunt sealing bolt 30. The coolant circulation of the CTP battery pack itself is the battery pack's own thermal management cycle, which includes its own liquid-cooling cycle and liquid-thermal cycle.

[0047] For example, when the CTP battery pack is circulating coolant, the coolant first flows into the integrated frame 10 from the inlet, then flows into the integrated liquid-cooled crossbeam 20 through the first and second diversion channels in the diversion sealing fixing bolt 30, then flows into the integrated frame 10 on the other side through the first and second diversion channels in the diversion sealing fixing bolt 30 on the other side, and finally flows out from the outlet.

[0048] Branch flow solenoids 40 are used to independently separate integrated liquid-cooled beams 20 from the liquid-cooling system for temperature difference regulation. Series water pipes 60 are used to connect branch flow solenoids 40 on two adjacent integrated liquid-cooled beams in an independent loop, wherein an independent loop includes one or more independently separated integrated liquid-cooled beams 20. Connecting water pipes 50 are used to connect the branch flow solenoids 40 on both sides of the integrated liquid-cooled beams in the independent loop to external thermal management equipment.

[0049] Specifically, such as Figure 1 As shown, when individual thermal management control of several branches is required, the shunt sealing fixing bolts 30 on each integrated liquid-cooled crossbeam 20 are removed, and branch flow solenoids 40 are installed respectively. The installed branch flow solenoids 40 can separate the integrated liquid-cooled crossbeam from the CTP battery pack liquid-cooling system so as to set up an independent circuit or shield the branch.

[0050] When setting up an independent loop, the series water pipe 60 is used to connect two branch flow-through solenoids 40 to achieve series connection of the corresponding two integrated liquid-cooled crossbeams. Two connecting water pipes 50 are respectively connected to the branch flow-through solenoids 40 at the inlet and outlet of the independent loop, and to external thermal management equipment. The external thermal management equipment can be an external chiller or other thermal management control device capable of independently heating or cooling the independent loop. Specifically, when constructing the independent loop, the connecting water pipes 50 and the series water pipe 60 can be fixed to the branch flow-through solenoids 40 using clamps.

[0051] The components of the temperature difference regulating device of this application will be described in detail below.

[0052] One possible implementation involves a diversion sealing fixing bolt 30 with a bolt head, a first step, a second step, a second sealing ring, a third sealing ring, and a fourth sealing ring. Among these, for example... Figure 3 As shown, the front end of the first step has a thread for connection and fixation. The second step is provided with a second diversion channel 12, and the first and second steps are provided with a first diversion channel 11. The first diversion channel 11 and the second diversion channel 12 are interconnected.

[0053] The second sealing ring is positioned at the unthreaded end of the first step; a groove can be created here to hold the second sealing ring in place. The third sealing ring is located at the connection between the first and second steps, typically affixed to the vertical end face on the left side of the second step (as shown in the diagram). The fourth sealing ring is located at the connection between the second step and the bolt head, typically affixed to the vertical end face on the left side of the bolt head (as shown in the diagram). Coolant can flow from the channels within the integrated frame into the second distribution channel, then through the first distribution channel, and out to the integrated liquid-cooled crossbeam, and vice versa.

[0054] In one embodiment of this application, such as Figure 4 As shown, the branch flow solenoid includes: a first step 41, a first step thread 42, a second sealing ring 43, a third sealing ring 44, a second step 45, a fourth sealing ring 46, a bolt head 47, and a solenoid inlet / outlet water pipe 48.

[0055] The first stepped thread 42 is located at the front end of the first step 41, and the first stepped thread 41 is used to screw the branch flow solenoid onto the corresponding integrated liquid-cooled crossbeam. The second sealing ring 43 is engaged in the groove at the rear section of the first step 41, the third sealing ring 44 is located at the connection between the first step 41 and the second step 42, and the fourth sealing ring 46 is located at the connection between the second step 45 and the bolt head 47. The arrangement and function of each sealing ring in the branch flow solenoid 40 are consistent with the sealing rings in the diversion sealing fixing screw 30, enabling sealing between the two connected components.

[0056] like Figure 5As shown, the interior of the branch flow solenoid 40 also includes a first connecting channel 1 and a second connecting channel 2. The first connecting channel 1 passes through the inlet and outlet water pipes 48 of the solenoid, and the second connecting channel 2 passes through the bolt head 47, the second step 45 and the first step 41. The first connecting channel 1 and the second connecting channel 2 are connected.

[0057] The following is a detailed explanation of the principle of using the temperature difference regulation device of this application to perform individual thermal management control on the relevant integrated liquid-cooled crossbeam.

[0058] In one embodiment of this application, one or more independent loops can be constructed in the liquid cooling system of the CTP battery pack, and each independent loop is thermally managed and controlled by an external thermal management device. Each independent loop may include one or more integrated liquid-cooled crossbeams. Several integrated liquid-cooled crossbeams can be connected in series as a separate cooling loop according to actual adjustment needs. For example, at least one integrated liquid-cooled crossbeam can be used as an independent loop, and at most all integrated liquid-cooled crossbeams can be connected in series as an independent loop. Alternatively, several integrated liquid-cooled crossbeams can be connected in series to form multiple independent series loops. The number of integrated liquid-cooled crossbeams included in each independent loop can be the same or different.

[0059] For example, such as Figure 6 As shown, three integrated liquid-cooled crossbeams can be connected in series to form an independent circuit. This independent circuit includes two series water pipes and two connecting water pipes on both sides. Figure 6 After being connected in series as shown, the three integrated liquid-cooled crossbeams will be independent of the battery pack liquid cooling system and will be individually thermally managed by an external refrigeration unit. Through individual thermal management control, such as heating or cooling, the temperature rise or fall of the corresponding cell in this independent circuit can be accelerated, thereby achieving temperature difference regulation through the "acceleration" method of this application.

[0060] In one embodiment of this application, such as Figure 7 As shown, when a branch flow solenoid is installed on only one side of the integrated liquid-cooled crossbeam, the integrated liquid-cooled crossbeam after the branch flow solenoid is installed will no longer have coolant circulating in and out of the CTP battery pack liquid cooling system. This achieves the isolation of the integrated liquid-cooled crossbeam from the CTP battery pack liquid cooling system and shields the battery pack liquid cooling system from the influence of the integrated liquid-cooled crossbeam.

[0061] In practice, when performing branch flow shielding, the branch flow solenoid is generally installed on the integrated frame on the inlet side, or it can be installed on the integrated frame on the outlet side. In this embodiment, the first connecting channel also includes a rubber plug, which is used to block the coolant flowing out after the branch flow solenoid is installed. That is, if coolant still flows out of the corresponding integrated liquid-cooled beam after the branch flow solenoid is installed, a rubber plug can be inserted into the first connecting channel of the branch flow solenoid to increase the shielding effect and completely block the coolant circulation in the battery pack liquid cooling system.

[0062] Based on this facility, since the integrated liquid-cooled crossbeam after installing the branch flow solenoid no longer has coolant circulation in the CTP battery pack liquid cooling system, the branch is not affected by the battery pack's own thermal management cycle. Therefore, it can further slow down the temperature rise or fall of the corresponding cells, thereby achieving temperature difference regulation through the "deceleration" method of this application.

[0063] The following is a detailed explanation of the process of applying the above acceleration and deceleration schemes in the liquid cooling system of CTP battery packs in practical applications.

[0064] As an example, such as Figure 8 As shown, when applying the above-mentioned acceleration scheme for temperature difference regulation, to save resources, a series water pipe can be used to form a series loop on two adjacent integrated liquid-cooled crossbeams in the CTP battery pack liquid cooling system. The number of integrated liquid-cooled crossbeams in series is determined according to actual needs. Connecting water pipes are installed on the outer integrated liquid-cooled crossbeams on both sides of the independent loop, connecting to an external chiller. The external chiller then performs separate thermal management control for this loop. The remaining branches in the liquid cooling system can execute the CTP battery pack's own thermal management cycle.

[0065] As another example, such as Figure 9 As shown, when applying the above deceleration scheme for temperature difference regulation, a branch flow solenoid is installed on one side of the branch requiring additional individual temperature difference regulation. The specific number of shielded integrated liquid-cooled crossbeams is determined according to actual needs. The remaining branches in the liquid-cooling system can execute the CTP battery pack's own thermal management cycle.

[0066] In summary, the temperature difference regulation device for the CTP battery pack in this application embodiment, based on actual temperature difference regulation requirements, can use components such as branch flow solenoids, connecting water pipes, and series water pipes to isolate the relevant integrated liquid cooling beams of the CTP battery pack from the battery pack liquid cooling system. This allows for accelerating or slowing down the temperature rise or fall of the relevant cells, creating a specified temperature difference between the individual cells of the battery pack. Therefore, this device can, on the one hand, accelerate or decelerate the temperature equalization between the individual cells, reducing the battery pack's settling time; on the other hand, it can accelerate or decelerate the creation of a fixed temperature difference between the individual cells, thereby reducing the time required to create the specified temperature difference and lowering the time cost of battery pack testing. Thus, this device improves the accuracy of battery pack temperature difference regulation, reduces time costs, and is beneficial for studying the actual thermal management performance of the battery pack under specified temperature differences.

[0067] To more clearly illustrate the specific implementation process of temperature difference regulation of the CTP battery pack through the temperature difference regulation device, a temperature difference regulation method for a CTP battery pack proposed in this application embodiment will be described in detail below. This method is applied to the temperature difference regulation device of the CTP battery pack in the above embodiment, that is, it uses the temperature difference regulation device in the above embodiment to perform individual thermal management control on the branches corresponding to the relevant cells in the CTP battery pack, so as to realize the temperature difference regulation method of this embodiment. The monitoring device involved in this method includes various components as described in the above embodiment, which will not be repeated here.

[0068] Figure 10 This is a flowchart of a temperature difference regulation monitoring method for a CTP battery pack proposed in an embodiment of this application, as shown below. Figure 10 As shown, the method includes the following steps:

[0069] Step S101: Place the CTP battery pack in the ambient temperature required for thermal management performance testing and obtain the current target temperature difference to be adjusted.

[0070] Among them, ambient temperature is the specified temperature required for thermal management performance testing of CTP battery pack, and target temperature difference is the specified temperature difference to be manufactured. This application manufactures the specified target temperature difference in CTP battery pack, so as to facilitate subsequent thermal management performance testing of CTP battery pack under the condition of target temperature difference.

[0071] Specifically, the CTP battery pack is placed in ambient temperature and left to stand, and the target temperature difference is obtained according to the thermal management performance test requirements. The target temperature difference can be zero or a fixed value greater than zero.

[0072] Step S102: When the target temperature difference is zero, the temperature of the CTP battery pack is balanced by the temperature difference adjustment device to adjust the temperature difference between each cell in the CTP battery pack to a preset range.

[0073] Specifically, when the target temperature difference to be manufactured is zero, the temperature of each cell in the CTP battery pack needs to be adjusted to be consistent so that the temperature difference between the cells tends to be zero. Therefore, this application uses a temperature difference adjustment device to perform temperature equalization processing on the CTP battery pack.

[0074] In the process of temperature equalization of the battery pack, the acceleration scheme described in the above embodiments can be used for adjustment. That is, by using relevant components in the temperature difference adjustment device, an independent circuit is constructed for the target battery cell that is individually thermally managed to accelerate the temperature rise or fall of the target battery cell. Alternatively, the deceleration scheme described in the above embodiments can also be used for adjustment. That is, the integrated liquid-cooled crossbeam corresponding to the target battery cell is shielded to slow down the temperature rise or fall of the target battery cell.

[0075] It should be noted that the acceleration scheme of this application is applicable to scenarios where external thermal management equipment is available, such as a refrigeration unit. When external thermal management equipment is available, this adjustment method can be used for both battery pack testing and whole vehicle testing. The deceleration scheme of this application, however, is applicable to scenarios where no external thermal management equipment is available, such as when testing a vehicle under winter and summer testing standards. Of course, the deceleration scheme of this application can also be used in scenarios where an external refrigeration unit is available.

[0076] The following sections provide a detailed explanation of the temperature equalization process for the CTP battery pack using both acceleration and deceleration schemes.

[0077] In one embodiment of this application, in a scenario employing an acceleration scheme, temperature equalization processing of the CTP battery pack is performed using a temperature difference regulation device, including the following steps:

[0078] First, the temperature of each cell in the CTP battery pack is detected, and the temperature of each cell is compared with a preset target temperature, which is determined based on test requirements and ambient temperature.

[0079] Specifically, after the CTP battery pack is placed in the ambient temperature required for testing and left to stand, the temperature of each cell in the battery pack is detected by a temperature detection device. Then, the temperature of each cell is compared with the target temperature to determine the relationship between the two temperatures.

[0080] Among them, the target temperature is related to the requirements of thermal management performance testing, and there is a corresponding relationship between the target temperature and the ambient temperature. For example, when the ambient temperature is extremely low, the target temperature is also extremely low.

[0081] Then, based on the relationship between the temperature of each cell and the target temperature, the corresponding battery pack thermal management cycle (including the battery pack's own liquid thermal cycle and liquid cooling cycle) is performed. Based on the target temperature difference to be adjusted, the target temperature, and the temperature of each cell after the battery pack thermal management cycle, the target cells that need to be separated from the CTP battery pack liquid cooling system are determined.

[0082] Then, components of the corresponding temperature difference regulation device are installed on the integrated liquid-cooled crossbeam corresponding to the target cell to form an independent circuit. The independent circuit is subjected to a separate thermal management cycle or the battery pack thermal management cycle is repeated until the cell temperature difference of the CTP battery pack meets the target temperature difference.

[0083] Since the relationship between the temperature of each cell and the target temperature can vary, the following section will explain the specific implementation process of temperature equalization under different conditions to more clearly illustrate this. Figure 11 The specific methods shown will be explained in detail.

[0084] In the first scenario, if all cell temperatures are higher than the target temperature, the battery pack is circulated under liquid cooling until the lowest cell temperature reaches the target temperature. Cells whose current cell temperature is greater than the minimum cell temperature are then selected as target cells.

[0085] Specifically, such as Figure 11 As shown, the liquid cooling system of the battery pack itself is activated, and the liquid cooling cycle continues until the lowest cell temperature among all battery cells drops to the target temperature. Then, the liquid cooling cycle is stopped, and the real-time temperature of each cell is monitored. The difference between the real-time temperature of each cell and the lowest cell temperature is calculated, and cells with a difference greater than 1°C are selected as target cells. There may be one or more target cells, and the temperature difference between the target cell and the target temperature does not meet the requirements for temperature uniformity.

[0086] Furthermore, multiple integrated liquid-cooled beams corresponding to each target cell are combined into an independent circuit through a temperature difference regulation device, and the independent circuit is liquid-cooled and circulated through an external thermal management device until the lowest cell temperature in the corresponding area of ​​the independent circuit reaches the target temperature.

[0087] Specifically, the position of the integrated liquid-cooled crossbeam corresponding to the target battery cell is determined, where one integrated liquid-cooled crossbeam may correspond to multiple battery cells. Then, the corresponding integrated liquid-cooled crossbeam and the two crossbeams connected to it are arranged according to... Figure 6 The scheme shown constructs an independent loop and starts an external chiller connected to the independent loop to perform additional liquid cooling circulation on the independent loop until the lowest cell temperature in each cell in the area corresponding to the independent loop is equal to the target temperature.

[0088] Therefore, the temperature difference between each cell in the area corresponding to the independent circuit and the target temperature can be adjusted to within 1℃, thus achieving the goal of adjusting the temperature difference between each cell in the battery pack and the target temperature to within 1℃, which meets the temperature balance requirements of the battery pack in practical applications.

[0089] In the second scenario, when all cell temperatures are below the target temperature, the battery pack undergoes liquid thermal cycling until the highest cell temperature reaches the target temperature. Cells whose current cell temperature is greater than the temperature threshold are then designated as target cells.

[0090] Specifically, continue Figure 11 The example shown initiates the liquid-thermal cycle of the battery pack's own liquid cooling system until the highest cell temperature among all battery cells in the pack reaches the target temperature. Then, the liquid-thermal cycle is stopped, and the real-time temperature of each cell is detected. The difference between the real-time temperature of each cell and the highest cell temperature is calculated, and cells with a difference greater than 1°C are selected as target cells.

[0091] Furthermore, multiple integrated liquid-cooled beams corresponding to each target cell are combined into an independent circuit through a temperature difference regulation device, and the independent circuit is circulated by liquid heat through an external thermal management device until the highest cell temperature in the area corresponding to the independent circuit is the target temperature.

[0092] Specifically, the position of the integrated liquid-cooled crossbeam corresponding to each target cell is determined, also according to... Figure 6 The scheme shown constructs an independent loop and starts an external chiller connected to the independent loop to perform additional liquid thermal circulation on the independent loop until the highest cell temperature in each cell in the area corresponding to the independent loop is equal to the target temperature.

[0093] Therefore, the temperature difference between each cell in the area corresponding to the independent circuit and the target temperature can be adjusted to within 1℃, thus achieving the goal of adjusting the temperature difference between each cell in the battery pack and the target temperature to within 1℃.

[0094] In the third case, when the target temperature is a non-threshold temperature, the highest cell temperature among all cell temperatures is compared with the preset distinguishing temperature. Based on the comparison result, the corresponding battery pack thermal management cycle is performed, and the target cell and the thermal management control method of the target cell are determined based on the battery pack thermal management cycle result.

[0095] Specifically, in cases other than the first and second scenarios mentioned above, where some cell temperatures are higher than the target temperature and some cell temperatures are lower than the target temperature, the highest cell temperature among all cell temperatures is compared with the distinguishing temperature. Figure 11The example shown uses 20°C as the distinguishing temperature. The distinguishing temperature can be determined based on the thermal management performance of the battery pack's own thermal management cycle system.

[0096] If the highest cell temperature exceeds the distinguishing temperature, the battery pack's own liquid cooling cycle is activated. Once the highest cell temperature drops to the target temperature, the process returns to the second scenario described above to determine the target cell and implement individual thermal management control for it. If the highest cell temperature is less than or equal to the distinguishing temperature, the battery pack's own liquid thermal cycle is activated. Once the highest cell temperature rises to the target temperature, the process returns to the first scenario described above to determine the target cell and implement individual thermal management control for it.

[0097] Therefore, this embodiment can adjust the temperature difference between each cell in the battery pack and the target temperature to within 1°C under various conditions. For individual cells that are not adjusted to within 1°C or whose temperature changes over time, they can be readjusted through the battery pack's internal circulation or by letting it stand still.

[0098] In one embodiment of this application, in a scenario employing a deceleration scheme, the temperature of the CTP battery pack is balanced using a temperature difference regulation device, including the following steps:

[0099] First, this embodiment also detects the temperature of each cell in the CTP battery pack and compares the temperature of each cell with a preset target temperature. Since the relationship between the temperature of each cell and the target temperature can vary, to more clearly illustrate the specific implementation process of temperature equalization using a deceleration scheme under various conditions, the following section combines... Figure 12 The specific methods shown will be explained in detail.

[0100] In the first scenario, when all cell temperatures are above the target temperature, the battery pack undergoes liquid cooling cycling until the lowest cell temperature among all cells in the pack drops to the target temperature. Cells whose current temperature difference from the lowest cell temperature is less than or equal to a temperature threshold (i.e., 1°C) are designated as target cells. In this embodiment, the temperature difference between the target cell and the target temperature satisfies the requirement of temperature uniformity.

[0101] Furthermore, branch flow solenoids are installed on one side of multiple integrated liquid-cooled crossbeams corresponding to the target cell, and the battery pack liquid cooling cycle and target cell selection are performed cyclically until the cycle number is reached or the temperature difference of all cells is less than or equal to the temperature threshold.

[0102] Specifically, the position of the integrated liquid-cooled crossbeam corresponding to the target cell is determined, and then the corresponding integrated liquid-cooled crossbeam and the two crossbeams connected to it are arranged according to... Figure 7The proposed solution uses branch flow solenoids to shield the three integrated liquid-cooled crossbeams. Then, the battery pack itself undergoes liquid-cooling cycling for all cells except the target cell. During the cycling process, it continuously monitors whether a new target cell meeting the requirements has appeared in the current cycle, and installs branch flow solenoids on the newly appearing target cells, until the temperature difference of all cells is less than or equal to 1°C or the cycle count limit is reached.

[0103] As for the second scenario, continue Figure 12 The example shown illustrates that when all cell temperatures are below the target temperature, the battery pack undergoes its own liquid thermal cycle until the highest cell temperature among all cells in the battery pack reaches the target temperature. Cells whose current cell temperature is less than or equal to the highest cell temperature are designated as target cells.

[0104] Furthermore, branch flow solenoids are installed on one side of multiple integrated liquid-cooled crossbeams corresponding to the target cell, and the battery pack liquid-thermal cycling and target cell selection are performed cyclically until the required number of cycles is reached or the temperature difference of all cells is less than or equal to the temperature threshold. The process of installing branch flow solenoids for the target cell and repeating the cycle can refer to the implementation method in the first case described above, and will not be repeated here.

[0105] In the third case, when the target temperature is a non-threshold temperature, the highest cell temperature among all cell temperatures is compared with the preset distinguishing temperature. Based on the comparison result, the corresponding battery pack thermal management cycle is performed, and the target cell and the thermal management control method of the target cell are determined based on the battery pack thermal management cycle result.

[0106] In the temperature equalization process based on the deceleration method in this embodiment, the processing method in the third case is the same as the processing process in the temperature equalization process based on the acceleration method described above. For specific implementation details, please refer to [link to relevant documentation]. Figure 12 The relevant descriptions in the above embodiments will not be repeated here.

[0107] Therefore, this embodiment can adjust the temperature difference between each cell in the battery pack and the target temperature to within 1°C under various conditions. For cells that still have a temperature difference greater than 1°C after exceeding the battery pack's own thermal management cycle limit, the temperature difference can be adjusted through the battery pack's own internal circulation until the temperature difference between all cells and the target temperature is within 1°C.

[0108] It should be noted that in the above embodiments of temperature equalization processing based on acceleration and deceleration methods, parameters such as the preset temperature value, the number of cycles, and the number of temperature difference adjustment device components can be adjusted according to actual needs, and this application does not impose any restrictions on this.

[0109] In one embodiment of this application, the heat preservation of the battery cell that has reached the target temperature in subsequent operations is also considered during the above-mentioned temperature equalization process. If the temperature difference between the target temperature and the ambient temperature is too large, the target temperature can be appropriately increased or decreased to facilitate temperature compensation in subsequent operations. This can avoid the need to repeat the temperature equalization operation, reduce the number of operations, and improve the adjustment efficiency.

[0110] For example, when the ambient temperature is lower than the target temperature, the target temperature is increased; when the ambient temperature is higher than the target temperature, the target temperature is decreased.

[0111] Based on the above embodiments, it should also be noted that since the above temperature equalization process requires the use of the battery pack's own thermal management cycle system or external thermal management equipment, and in practical applications the cooling equipment may not be able to meet the minimum cooling requirements required for the target temperature, this application also proposes a method to accelerate temperature equalization in extreme cases.

[0112] Because the cooling and heating capabilities of external cooling equipment or the vehicle thermal management system (i.e., the battery pack thermal management cycle system during vehicle testing) are limited, the temperature equalization method in the above embodiments needs to be adjusted when the target temperature is an extreme temperature. Since the heating capabilities of current external thermal management equipment and the vehicle thermal management system can cover the high-temperature conditions of the battery, in this case, only extreme low-temperature conditions generally need to be considered. That is, when the target temperature is extremely low and the cooling equipment cannot meet the cooling requirements, the temperature equalization method for extreme conditions proposed in this embodiment needs to be adopted. As described above, based on the correlation between the target temperature and the ambient temperature, the ambient temperature is usually also extremely low at this time.

[0113] In this embodiment, when the target temperature is extremely low, the CTP battery pack is temperature balanced using a temperature difference adjustment device, including the following steps: First, it is detected whether the cooling capacity of the external thermal management device and the battery pack thermal management system is suitable for the target temperature; if it is not suitable for the target temperature, the highest cell temperature is adjusted to the target temperature by placing the CTP battery pack at ambient temperature; then, cells whose temperature difference between the current cell temperature and the highest cell temperature is greater than a temperature threshold are selected as target cells, and an independent circuit is constructed for each target cell for heating until the temperature difference between each target cell and the target temperature is less than the temperature threshold; or, cells whose temperature difference between the current cell temperature and the highest cell temperature is less than or equal to the temperature threshold are selected as target cells, and branch flow solenoids are installed on one side of multiple integrated liquid-cooled crossbeams corresponding to each target cell, and the battery pack liquid-cooled thermal cycle is cyclically performed until the temperature difference between all cells and the target temperature is less than the temperature threshold.

[0114] Specifically, in this embodiment, there are also two methods: a temperature equalization processing method based on acceleration under extreme temperatures and a temperature equalization processing method based on deceleration under extreme temperatures.

[0115] For the accelerated temperature equalization method under extreme temperatures, the battery pack or vehicle is first placed in a low-temperature environment. Once the highest cell temperature reaches the target temperature, the integrated liquid-cooled crossbeam containing cells with temperatures below -1°C of the target temperature, along with the two front and rear crossbeams, are connected in series as a separate circuit for heating. During the cycle, if the temperature of any cell participating in the cycle equals the target temperature, the cycle for that branch is stopped. This continues until the temperature of all cells participating in the cycle is ≥ the target temperature -1°C and ≤ the target temperature +1°C.

[0116] For example, assuming an ambient temperature of -15°C, a minimum water temperature of 5°C for the cooling equipment, and a target cell temperature of -10°C, the cooling equipment will not meet the requirements. In this embodiment, the battery pack is first placed in an ambient temperature of -15°C until the highest cell temperature reaches -10°C. For the integrated liquid-cooled crossbeam containing cells with temperatures < -11°C, as well as the two crossbeams before and after it, a separate series circuit is used for heating. During the cycle, when the temperature of any cell participating in the cycle reaches -10°C, the cycle of that branch is stopped until the temperature of all cells participating in the cycle is within -10±1°C.

[0117] For the temperature equalization method under extreme temperatures based on deceleration, the battery pack or vehicle is first placed in a low-temperature environment. Once the highest cell temperature reaches the target temperature, for all cells except those with temperatures below the target temperature of -1°C, branch flow solenoids are installed on the integrated liquid-cooled crossbeam and the two front and rear crossbeams where the cells are located. The battery pack's own liquid thermal cycle is then initiated. During the cycle, when the temperature of any cell participating in the cycle equals the target temperature, branch flow solenoids are installed on the corresponding integrated liquid-cooled crossbeam and the two front and rear crossbeams until the temperature of all cells participating in the cycle is ≥ the target temperature -1°C and ≤ the target temperature +1°C.

[0118] For example, assuming an ambient temperature of -15°C, a minimum vehicle thermal management coolant temperature of 5°C, and a target cell temperature of -10°C, the vehicle's thermal management does not meet the requirements. In this embodiment, the vehicle is first left to stand at an ambient temperature of -15°C until the highest cell temperature reaches -10°C. Branch flow-through solenoids are then installed on the integrated liquid-cooled crossbeam and the two front and rear crossbeams containing cells other than those with temperatures < -11°C. The liquid-thermal circulation of the vehicle's thermal management system is then initiated. During the circulation process, when the temperature of any cell participating in the circulation reaches -10°C, branch flow-through solenoids are installed on the corresponding integrated liquid-cooled crossbeam and the two front and rear crossbeams until the temperature of all cells participating in the circulation is within -10±1°C.

[0119] In this embodiment, the insulation performance of the battery cell after reaching the target temperature also needs to be considered in subsequent operations. If the temperature difference with the ambient temperature is too large, the target temperature can be appropriately increased or decreased for temperature compensation in subsequent operations, avoiding the need to repeat the temperature equalization operation. For example, if the ambient temperature is lower than the target temperature, the target temperature is increased; if the ambient temperature is higher than the target temperature, the target temperature is decreased.

[0120] Step S103: When the target temperature difference is greater than zero, a temperature difference is generated in the CTP battery pack by means of a temperature difference adjustment device, so as to adjust the difference between the highest cell temperature and the lowest cell temperature in the CTP battery pack to the target temperature difference.

[0121] Specifically, when the target temperature difference to be manufactured is a fixed value greater than zero, the difference between the highest and lowest cell temperatures in the CTP battery pack needs to be adjusted to the target temperature difference to ensure that the temperature difference between the cells in the battery pack is within the target temperature range. To this end, this application uses a temperature difference adjustment device to generate the target temperature difference in the CTP battery pack.

[0122] In the process of creating the target temperature difference in the battery pack, the acceleration scheme described in the above embodiments can also be used for adjustment. That is, by constructing an independent circuit for the target battery cell that is individually thermally managed through relevant components in the temperature difference adjustment device, the temperature rise or fall of the target battery cell can be accelerated. Alternatively, the deceleration scheme described in the above embodiments can also be used for adjustment, that is, shielding the integrated liquid-cooled crossbeam corresponding to the target battery cell to slow down the temperature rise or fall of the target battery cell.

[0123] It should be noted that, similar to the temperature equalization process in the previous step, the acceleration scheme of this application is also applicable to scenarios where there are available external thermal management devices, such as a refrigeration unit, in the process of creating the target temperature difference. When external thermal management devices are available, this adjustment method can be used for both battery pack testing and whole vehicle testing. The deceleration scheme of this application is applicable to scenarios where there are no available external thermal management devices, such as when testing a vehicle under winter and summer testing standards. Of course, the deceleration scheme of this application can also be used in scenarios where an external refrigeration unit is available.

[0124] The following sections provide a detailed explanation of the process of creating the target temperature difference in the CTP battery pack using both acceleration and deceleration schemes.

[0125] In one embodiment of this application, in a scenario employing an acceleration scheme, the process of creating a target temperature difference in a CTP battery pack using a temperature difference regulation device includes the following steps:

[0126] First, the temperature of each cell in the CTP battery pack is detected, and the temperature of each cell is compared with the preset minimum target temperature. The target temperature difference is equal to the maximum target temperature minus the minimum target temperature.

[0127] Specifically, after placing the CTP battery pack in the ambient temperature required for testing and letting it stand, the temperature of each cell in the battery pack is detected by a temperature detection device. Then, the temperature of each cell is compared with the lowest target temperature to determine the relationship between the temperature of each cell and the lowest target temperature.

[0128] Among them, the target temperature difference to be adjusted is equal to the highest target temperature minus the lowest target temperature. The setting method of the lowest target temperature is similar to that of the target temperature in the previous step, and it is also related to the requirements of thermal management performance testing. The lowest target temperature has a corresponding relationship with the ambient temperature. For example, when the ambient temperature is extremely low, the lowest target temperature is also extremely low.

[0129] Then, based on the relationship between the temperature of each cell and the minimum target temperature, the corresponding battery pack thermal management cycle (including the battery pack's own liquid thermal cycle and liquid cooling cycle) is performed. Based on the target temperature difference to be adjusted, the maximum target temperature, the minimum target temperature, and the temperature of each cell after the battery pack thermal management cycle, the target cells that need to be separated from the CTP battery pack liquid cooling system are determined.

[0130] Then, components of the corresponding temperature difference regulation device are installed on the integrated liquid-cooled crossbeam corresponding to the target cell to form an independent loop. The independent loop is subjected to a separate thermal management cycle until the difference between the highest and lowest cell temperatures of the CTP battery pack is the target temperature difference.

[0131] Since the relationship between the temperature of each cell and the minimum target temperature can vary, the following section will explain the specific process of achieving the target temperature difference under different conditions in order to more clearly illustrate this. Figure 13 The specific methods shown will be explained in detail.

[0132] In the first scenario, when all cell temperatures are higher than the minimum target temperature, the battery pack undergoes liquid cooling cycling until the highest cell temperature is equal to the minimum target temperature plus the target temperature difference, and the lowest cell temperature is equal to the minimum target temperature.

[0133] Specifically, such as Figure 13 As shown, the liquid cooling system of the battery pack itself is activated to circulate the liquid cooling until the temperature of the highest cell among all the cells in the battery pack drops to the lowest target temperature plus the target temperature difference. Then, a branch flow solenoid is installed on the integrated liquid cooling beam corresponding to the cell with the highest cell temperature. Subsequently, the lowest cell temperature drops to the target temperature.

[0134] Then, the liquid cooling cycle is stopped, and the cells that need to be heated are taken as target cells. The multiple integrated liquid cooling beams corresponding to each target cell are combined into an independent circuit through the temperature difference adjustment device, and the independent circuit is circulated by liquid heat through the external thermal management equipment until the highest cell temperature in the corresponding area of ​​the independent circuit is greater than or equal to the lowest target temperature plus the target temperature.

[0135] Specifically, the battery cell requiring heating can be a battery cell specified according to testing needs, or a battery cell with a higher temperature after the liquid cooling cycle described above. After the liquid cooling cycle is completed until the lowest battery cell temperature drops to the target temperature, the highest battery cell temperature that first reaches the lowest target temperature plus the target temperature difference may change. Therefore, in this embodiment, the battery cell requiring heating is selected as the target battery cell. There can be one or more target battery cells.

[0136] Then, an independent circuit is set up for each target cell, and an additional liquid thermal cycle is performed on the target cell individually through an external thermal management device connected to the independent circuit until the highest cell temperature in the corresponding area of ​​the independent circuit is greater than or equal to the lowest target temperature plus the target temperature.

[0137] This achieves the goal of ensuring that the temperature difference between the highest and lowest cells in the battery pack is greater than or equal to the target temperature difference, thus creating the specified target temperature difference within the battery pack.

[0138] As for the second scenario, continue to refer to... Figure 13 The example shown illustrates that, under the condition that the cell temperature is consistently less than or equal to the target temperature, the battery pack undergoes liquid thermal cycling until the highest cell temperature among all cells is equal to the lowest target temperature plus the target temperature difference, and the lowest cell temperature is equal to the lowest target temperature.

[0139] Furthermore, the battery cells that need to be heated are taken as target battery cells. Multiple integrated liquid-cooled crossbeams corresponding to each target battery cell are combined into an independent circuit through a temperature difference adjustment device. The independent circuits are then circulated by liquid heat through an external thermal management device until the highest battery cell temperature in the corresponding area of ​​the independent circuit is greater than or equal to the lowest target temperature plus the target temperature.

[0140] It should be noted that the implementation method of liquid thermal cycling of independent loops in the second case of this embodiment is the same as that in the first case, and will not be repeated here.

[0141] Therefore, this embodiment can adjust the difference between the highest and lowest cell temperatures in the battery pack as the target temperature difference under various conditions, thereby achieving the creation of a specified target temperature difference in the battery pack.

[0142] In one embodiment of this application, in a scenario employing a deceleration scheme, the process of creating a target temperature difference in the CTP battery pack using a temperature difference regulation device includes the following steps:

[0143] First, this embodiment also detects the temperature of each cell in the CTP battery pack and compares the temperature of each cell with a preset minimum target temperature. Since the relationship between the temperatures of each cell and the minimum target temperature can vary, to more clearly illustrate the specific implementation process of creating a target temperature difference in the battery pack using a deceleration scheme under various conditions, the following section combines... Figure 14 The specific methods shown will be explained in detail.

[0144] In the first scenario, if all cell temperatures are higher than the minimum target temperature, the battery pack is liquid-cooled and circulated until the highest cell temperature is equal to the minimum target temperature plus the target temperature difference, or the lowest cell temperature is equal to the minimum target temperature.

[0145] Furthermore, the liquid cooling cycle is stopped. The cell corresponding to the highest or lowest cell temperature that meets the judgment condition in the previous step is designated as the target cell. A branch flow solenoid is installed on one side of the multiple integrated liquid cooling beams corresponding to the target cell, and the battery pack liquid cooling cycle is repeated. During each cycle, it is detected in real time whether a new target cell that meets the judgment condition in the previous step has appeared, and a branch flow solenoid is installed for the newly qualified target cell, until the highest cell temperature among all cells is the lowest target temperature plus the target temperature difference, and the lowest cell temperature is the lowest target temperature.

[0146] As for the second scenario, continue to refer to... Figure 14 The example shown demonstrates that the battery pack undergoes electrothermal cycling when all cell temperatures are below the minimum target temperature, until the highest cell temperature is equal to the minimum target temperature plus the target temperature difference, or the lowest cell temperature is equal to the minimum target temperature.

[0147] Furthermore, the liquid thermal cycling is stopped. The cell corresponding to the highest or lowest cell temperature that meets the judgment condition in the previous step is designated as the target cell. A branch flow solenoid is installed on one side of multiple integrated liquid-cooled crossbeams corresponding to the target cell, and the battery pack liquid thermal cycling and target cell selection are repeated cyclically. During each round of battery pack liquid thermal cycling, it is also detected in real time whether a new target cell that meets the judgment condition in the previous step has appeared, and a branch flow solenoid is installed for the newly qualified target cell, until the highest cell temperature among all cells is the lowest target temperature plus the target temperature difference, and the lowest cell temperature is the lowest target temperature.

[0148] In the third scenario, when the minimum target temperature is a non-threshold temperature, the battery pack is liquid-cooled and cyclically cooled until the highest cell temperature among all cells is equal to the minimum target temperature plus the target temperature difference. The lowest cell temperature among all cells is then compared with the minimum target temperature, and the corresponding battery pack thermal management cycle is performed based on the comparison result.

[0149] For details, please refer to... Figure 14 The example shown illustrates that, in cases other than the first and second scenarios mentioned above, where some cell temperatures are higher than the minimum target temperature and some cell temperatures are lower than the minimum target temperature, the battery pack itself undergoes a liquid cooling cycle until the highest cell temperature among all cells equals the minimum target temperature plus the target temperature difference.

[0150] Then, stop the liquid cooling cycle, and take the cell corresponding to the highest cell temperature as the target cell, recording the position of the integrated liquid cooling beam corresponding to the target cell. Next, compare the lowest cell temperature among all current cell temperatures with the lowest target temperature. If the lowest cell temperature is lower than the lowest target temperature, return to the second scenario described above, first installing a branch flow solenoid on the integrated liquid cooling beam corresponding to the currently determined target cell, and then cyclically performing the battery pack's own liquid cooling cycle and target cell selection. If the lowest cell temperature is higher than the lowest target temperature, return to the first scenario described above, first installing a branch flow solenoid on the integrated liquid cooling beam corresponding to the currently determined target cell, and then cyclically performing the battery pack's own liquid cooling cycle and target cell selection.

[0151] Therefore, this embodiment can adjust the difference between the highest and lowest cell temperatures in the battery pack as the target temperature difference under various conditions, thereby achieving the creation of a specified target temperature difference in the battery pack.

[0152] It should be noted that in the above embodiments of manufacturing the target temperature difference based on the acceleration method and the deceleration method, the preset temperature value, the number of cycles, and the number of temperature difference adjustment device components can all be adjusted according to actual needs, and this application does not impose any restrictions on this. The implementation method of installing the branch flow solenoid and setting up an independent circuit on the corresponding integrated liquid-cooled crossbeam in this embodiment can refer to the setting method in the above embodiments, and the implementation process is the same. Furthermore, in this embodiment, considering the heat preservation of the battery cell that has reached the target temperature in subsequent operations during the temperature difference manufacturing process, the method of increasing or decreasing the target temperature can refer to the description in the relevant embodiments of the above temperature equalization process, and the implementation process is the same, so it will not be repeated here.

[0153] Based on the above embodiments, it should also be noted that, since the process of manufacturing target temperature difference also requires the use of the battery pack's own thermal management cycle system or external thermal management equipment, and in practical applications, the refrigeration equipment may not be able to meet the minimum refrigeration requirements required for the target temperature, this application also proposes a method for manufacturing target temperature difference under extreme conditions.

[0154] In this embodiment, the target temperature difference manufacturing method under extreme conditions also only considers extreme low temperature situations. That is, when the lowest target temperature is extremely low and the refrigeration equipment cannot meet the refrigeration requirements, the target temperature difference manufacturing method under extreme conditions proposed in this embodiment needs to be adopted. As can be seen from the above description, based on the correlation between the lowest target temperature and the ambient temperature, the ambient temperature is usually also extremely low at this time.

[0155] In this embodiment, when the minimum target temperature is an extremely low temperature, a temperature difference is created in the CTP battery pack using a temperature difference adjustment device, including the following: First, it is detected whether the cooling capacity of the external thermal management equipment and the battery pack thermal management system is suitable for the minimum target temperature; if it is not suitable for the minimum target temperature, the highest cell temperature is adjusted to the highest target temperature by placing the CTP battery pack at ambient temperature; then, cells whose current cell temperature is lower than the minimum target temperature are taken as target cells, and an independent circuit is constructed for each target cell for heating until the temperature of each target cell is within the range formed by the maximum and minimum target temperatures; or, cells whose current cell temperature is greater than or equal to the minimum target temperature are taken as target cells, and a branch flow solenoid is installed on one side of multiple integrated liquid-cooled crossbeams corresponding to each target cell, and the battery pack liquid-cooled thermal cycle is circulated until the temperature of all cells is within the range.

[0156] Specifically, in this embodiment, there are two methods: one for manufacturing a target temperature difference under extreme temperatures based on the acceleration method, and the other for manufacturing a target temperature difference under extreme temperatures based on the deceleration method.

[0157] For the accelerated manufacturing method based on the target temperature difference under extreme temperatures, the battery pack or vehicle is first placed in a low-temperature environment. When the highest cell temperature reaches the highest target temperature, a separate circuit is connected in series to heat the integrated liquid-cooled crossbeam containing cells with temperatures lower than the lowest target temperature, as well as the two front and rear crossbeams. During the cycle, if the temperature of any cell participating in the cycle equals the lowest target temperature, the cycle for that branch is stopped. This process continues until the temperature of all cells participating in the cycle is greater than or equal to the lowest target temperature and less than or equal to the highest target temperature.

[0158] For example, assuming an ambient temperature of -15°C, a minimum water temperature of 5°C for the cooling equipment, a minimum target cell temperature of -10°C, and a maximum target cell temperature of 0°C, the cooling equipment does not meet the requirements. In this embodiment, the battery pack is first placed in an ambient temperature of -15°C until the maximum cell temperature reaches 0°C. For the integrated liquid-cooled crossbeam containing cells with temperatures < -10°C, and the two crossbeams before and after it, a separate circuit is connected in series for heating. During the cycle, when the temperature of a cell participating in the cycle reaches -10°C, the cycle of that branch is stopped until the temperature of all cells participating in the cycle is within the range of -5±5°C.

[0159] For the manufacturing method based on the deceleration method to target temperature difference under extreme temperatures, the battery pack or vehicle is first placed in a low-temperature environment. When the highest cell temperature reaches the highest target temperature, branch flow solenoids are installed on the integrated liquid-cooled crossbeam and the two front and rear crossbeams of the cells other than those with temperatures lower than the lowest target temperature. The battery pack's own liquid thermal cycle is then initiated. During the cycle, when the temperature of any cell participating in the cycle equals the lowest target temperature, branch flow solenoids are installed on the corresponding integrated liquid-cooled crossbeam and the two front and rear crossbeams until the temperature of all cells participating in the cycle is ≥ the lowest target temperature and ≤ the highest target temperature.

[0160] For example, assuming an ambient temperature of -15°C, a minimum vehicle thermal management coolant temperature of 5°C, a minimum target cell temperature of -10°C, and a maximum target cell temperature of 0°C, the vehicle's thermal management does not meet the requirements. In this embodiment, the vehicle is first placed at an ambient temperature of -15°C until the maximum cell temperature reaches 0°C. Branch flow-through solenoids are installed on the integrated liquid-cooled crossbeam and the two front and rear crossbeams containing cells other than those with temperatures below -10°C. The battery pack's own liquid-cooled thermal cycle is then initiated. During the cycle, when the temperature of any cell participating in the cycle reaches -10°C, branch flow-through solenoids are installed on the corresponding integrated liquid-cooled crossbeam and the two front and rear crossbeams until the temperature of all cells participating in the cycle falls within the range of -5±5°C.

[0161] In this embodiment, the insulation performance of the battery cell after reaching the target temperature also needs to be considered in subsequent operations. If the temperature difference with the ambient temperature is too large, the target temperature can be appropriately increased or decreased for temperature compensation in subsequent operations, avoiding the need to repeat the temperature equalization operation. For example, if the ambient temperature is lower than the target temperature, the target temperature is increased; if the ambient temperature is higher than the target temperature, the target temperature is decreased.

[0162] In summary, the temperature difference adjustment method for the CTP battery pack in this application can, on the one hand, accelerate the temperature equalization between individual cells and reduce the resting time of the battery pack by accelerating or decelerating the process; on the other hand, it can also accelerate the creation of a fixed temperature difference between the individual cells by accelerating or decelerating the process, thereby reducing the time required to create the specified temperature difference and lowering the time cost of battery pack testing. Furthermore, this method can accurately create the specified temperature difference between the cells, reducing the deviation between the actual temperature difference and the specified temperature difference. This allows for the addition of temperature difference-related test items during battery pack testing, improving the comprehensiveness of battery pack testing and the robustness of thermal management performance. Moreover, because this method can create a precise specified temperature difference, it can improve the accuracy of battery pack test results and ensure their reliability. Therefore, this method improves the accuracy of battery pack temperature difference adjustment, reduces time costs, and is beneficial for studying the actual thermal management performance of the battery pack under a specified temperature difference.

[0163] To implement the above embodiments, this application also proposes a non-transitory computer-readable storage medium storing a computer program, which, when executed by a processor, implements the temperature difference regulation method for a CTP battery pack as proposed in the second aspect of the present application.

[0164] It should be noted that various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0165] Furthermore, in the description of this application, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0166] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0167] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0168] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0169] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this invention.

Claims

1. A temperature difference adjustment device of a CTP battery pack, characterized by, The device comprises: an integrated frame, a plurality of integrated liquid cooling crossbeams, a plurality of shunt sealing fixing bolts, a plurality of branch flow-through coils, a plurality of connecting water pipes, and a plurality of series water pipes; wherein, each of the integrated liquid cooling crossbeams corresponds to a branch of the CTP battery pack liquid cooling system, and the shunt sealing fixing bolt is used to fix the integrated liquid cooling crossbeam that has not undergone temperature difference adjustment on the integrated frame to circulate the cooling liquid of the CTP battery pack itself; the branch flow-through coil is used to separate the integrated liquid cooling crossbeam that undergoes temperature difference adjustment from the liquid cooling system; the series water pipe is used to connect the branch flow-through coils on two adjacent integrated liquid cooling crossbeams in an independent circuit, wherein the independent circuit comprises one or more separated integrated liquid cooling crossbeams; the connecting water pipe is used to connect the branch flow-through coils on the integrated liquid cooling crossbeams at both sides of the independent circuit to an external thermal management device; wherein the cooling liquid circulates in the channel formed by the integrated frame, the integrated liquid cooling crossbeams, and the shunt sealing fixing bolt; when individual thermal management control of a plurality of branches is required, the shunt sealing fixing bolt on each integrated liquid cooling crossbeam is removed, and a branch flow-through coil is installed, which separates the integrated liquid cooling crossbeam from the CTP battery pack liquid cooling system to set up an independent circuit or shield the branch.

2. The temperature difference regulating device of a CTP battery pack according to claim 1, characterized by, The branch flow-through coil comprises: a first step, a first step thread, a second sealing ring, a third sealing ring, a second step, a fourth sealing ring, a bolt head, a coil inlet and outlet pipe, a first connecting channel, and a second connecting channel; wherein, the first step thread is located at the front end of the first step, and is used to screw and fix the branch flow-through coil on the corresponding integrated liquid cooling crossbeam; the second sealing ring is clamped at the groove of the rear section of the first step, the third sealing ring is located at the connection between the first step and the second step, and the fourth sealing ring is located at the connection between the second step and the bolt head; the first connecting channel penetrates through the coil inlet and outlet pipe, and the second connecting channel penetrates through the bolt head, the second step, and the first step, and the first connecting channel and the second connecting channel are connected.

3. The temperature difference regulating device of a CTP battery pack according to claim 2, characterized in that, The liquid cooling system comprises one or more independent circuits, and each independent circuit is controlled by the external thermal management device; The first connecting channel further comprises a rubber plug, which is used to block the cooling liquid flowing out of the branch flow-through coil after installation.

4. A temperature difference adjustment method of a CTP battery pack, characterized by, The temperature difference adjustment method applied to the CTP battery pack of any one of claims 1-3 comprises the following steps: placing the CTP battery pack in an environment temperature required for thermal management performance testing, and obtaining a target temperature difference to be adjusted; when the target temperature difference is zero, performing temperature equalization processing on the CTP battery pack by the temperature difference adjustment device to adjust the temperature difference between each cell in the CTP battery pack to a preset range. When the target temperature difference is greater than zero, a temperature difference is created in the CTP battery pack by the temperature difference adjusting device to adjust the difference between the highest cell temperature and the lowest cell temperature in the CTP battery pack to the target temperature difference; In the process of performing the temperature equalization processing and creating a temperature difference in the CTP battery pack, related components in the temperature difference adjusting device are used to construct an independent loop for a target cell that is individually controlled for thermal management to accelerate the temperature rise or fall of the target cell, or shield the integrated liquid cooling cross beam corresponding to the target cell to slow down the temperature rise or fall of the target cell; The temperature equalization processing of the CTP battery pack by the temperature difference adjusting device includes: Detecting the temperature of each cell in the CTP battery pack and comparing the temperature of each cell with a preset target temperature, wherein the target temperature is determined based on test requirements and the ambient temperature; In the case where all cell temperatures are greater than the target temperature, battery pack liquid cooling circulation is performed until the lowest cell temperature is the target temperature, and a cell whose difference between the current cell temperature and the lowest cell temperature is greater than a preset temperature threshold is selected as a target cell; The multiple integrated liquid cooling cross beams corresponding to each target cell are combined into the independent loop by the temperature difference adjusting device, and the independent loop is subjected to liquid cooling circulation by an external thermal management device until the lowest cell temperature in the corresponding area of the independent loop is the target temperature; In the case where all cell temperatures are less than the target temperature, battery pack liquid cooling circulation is performed until the highest cell temperature is the target temperature, and a cell whose difference between the current cell temperature and the highest cell temperature is greater than the temperature threshold is selected as a target cell; The multiple integrated liquid cooling cross beams corresponding to each target cell are combined into the independent loop by the temperature difference adjusting device, and the independent loop is subjected to liquid cooling circulation by an external thermal management device until the lowest cell temperature in the corresponding area of the independent loop is the target temperature; In the case where the target temperature is a non-threshold temperature, the highest cell temperature among all cell temperatures is compared with a preset distinguishing temperature, corresponding battery pack thermal management circulation is performed according to the comparison result, and a target cell and a thermal management control mode of the target cell are determined according to the battery pack thermal management circulation result.

5. The method of claim 4, wherein the CTP battery pack is temperature regulated by, The temperature equalization processing of the CTP battery pack by the temperature difference adjusting device also includes: In the case where all cell temperatures are greater than the target temperature, battery pack liquid cooling circulation is performed until the lowest cell temperature is the target temperature, and a cell whose difference between the current cell temperature and the lowest cell temperature is less than or equal to the temperature threshold is selected as a target cell; A branch flow-through coil is installed on one side of the multiple integrated liquid cooling cross beams corresponding to the target cell, and battery pack liquid cooling circulation and target cell selection are cyclically performed until a cycle number is reached or all cell temperature differences are less than or equal to the temperature threshold; In the case that all the cell temperatures are less than the target temperature, the battery pack liquid heat cycle is performed until the highest cell temperature is the target temperature, and the cell whose difference between the current cell temperature and the highest cell temperature is less than or equal to the temperature threshold is selected as the target cell; In the case that all the cell temperatures are less than the target temperature, the battery pack liquid heat cycle is performed until the highest cell temperature is the target temperature, and the cell whose difference between the current cell temperature and the highest cell temperature is less than or equal to the temperature threshold is selected as the target cell; 6. The method of claim 4, wherein the CTP battery pack temperature difference adjustment method is characterized by, In the case that the target temperature is an extremely low temperature, the temperature equalization of the CTP battery pack by the temperature difference adjustment device further comprises: Detecting whether the refrigeration capacity of the external thermal management equipment and the battery pack thermal management system is suitable for the target temperature; In the case that the refrigeration capacity is not suitable for the target temperature, the highest cell temperature is adjusted to the target temperature by placing the CTP battery pack in the ambient temperature; The cell whose difference between the current cell temperature and the highest cell temperature is greater than the temperature threshold is selected as the target cell, and each target cell is heated in an independent loop until the temperature difference between each target cell and the target temperature is less than the temperature threshold; or The cell whose difference between the current cell temperature and the highest cell temperature is less than or equal to the temperature threshold is selected as the target cell, and a branch through-flow coil is installed on one side of each target cell corresponding to the plurality of integrated liquid cooling crossbeams, and the battery pack liquid heat cycle is performed until the temperature difference between all the cell temperatures and the target temperature is less than the temperature threshold.

7. The method of claim 4, wherein the CTP battery pack is temperature-regulated by, The temperature difference in the CTP battery pack is created by the temperature difference adjustment device, which comprises: Detecting the temperature of each cell in the CTP battery pack, and comparing the temperature of each cell with a preset minimum target temperature, wherein the target temperature difference is equal to the highest target temperature minus the minimum target temperature; In the case that all the cell temperatures are greater than the minimum target temperature, the battery pack liquid cooling cycle is performed until the highest cell temperature in all the cells is the minimum target temperature plus the target temperature difference, and the lowest cell temperature is the minimum target temperature; In the case that there is a cell whose temperature is less than or equal to the minimum target temperature, the battery pack liquid heat cycle is performed until the highest cell temperature in all the cells is the minimum target temperature plus the target temperature difference, and the lowest cell temperature is the minimum target temperature; The cell that needs to be warmed up is selected as the target cell, the plurality of integrated liquid cooling crossbeams corresponding to each target cell are formed into an independent loop by the temperature difference adjustment device, and the independent loop is subjected to liquid heat cycle by the external thermal management equipment until the highest cell temperature in the corresponding area of the independent loop is greater than or equal to the minimum target temperature plus the target temperature.

8. The method of claim 7, wherein the CTP battery pack is temperature regulated by, The temperature difference in the CTP battery pack is created by the temperature difference adjustment device, which further comprises: In the case that all the cell temperatures are greater than the minimum target temperature, battery pack liquid cooling circulation is performed until the highest cell temperature among all the cells is the minimum target temperature plus the target temperature difference, or the lowest cell temperature is the minimum target temperature; The cell corresponding to the highest cell temperature or the lowest cell temperature is taken as a target cell, branch through-flow coil pipes are installed on one side of the integrated liquid cooling cross beams corresponding to the target cell, and battery pack liquid cooling circulation and target cell selection are performed in circulation until the highest cell temperature among all the cells is the minimum target temperature plus the target temperature difference, and the lowest cell temperature is the minimum target temperature; In the case that all the cell temperatures are less than the minimum target temperature, battery pack liquid heating circulation is performed until the highest cell temperature among all the cells is the minimum target temperature plus the target temperature difference, or the lowest cell temperature is the minimum target temperature; The cell corresponding to the highest cell temperature or the lowest cell temperature is taken as a target cell, branch through-flow coil pipes are installed on one side of the integrated liquid cooling cross beams corresponding to the target cell, and battery pack liquid heating circulation and target cell selection are performed in circulation until the highest cell temperature among all the cells is the minimum target temperature plus the target temperature difference, and the lowest cell temperature is the minimum target temperature; In the case that the minimum target temperature is a non-threshold temperature, battery pack liquid cooling circulation is performed until the highest cell temperature among all the cells is the minimum target temperature plus the target temperature difference, and the lowest cell temperature among all the current cell temperatures is compared with the minimum target temperature, and corresponding battery pack thermal management circulation is performed according to the comparison result.

9. The method of claim 7, wherein the CTP battery pack is temperature-regulated by, The temperature difference adjustment device in the CTP battery pack also includes: Detecting whether the refrigeration capacity of the external thermal management equipment and the battery pack thermal management system is applicable to the minimum target temperature; In the case that it is not applicable to the minimum target temperature, the highest cell temperature is adjusted to the highest target temperature by placing the CTP battery pack in the ambient temperature; The cell whose current cell temperature is lower than the minimum target temperature is taken as a target cell, and each target cell is heated in an independent loop until the temperature of each target cell is within the interval formed by the highest target temperature and the minimum target temperature; or The cell whose current cell temperature is greater than or equal to the minimum target temperature is taken as a target cell, branch through-flow coil pipes are installed on one side of the integrated liquid cooling cross beams corresponding to each target cell, and battery pack liquid heating circulation is performed in circulation until all the cell temperatures are within the interval.

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