A thermal management control method and system for a CTP battery pack

Abstract

The present invention proposes a thermal management control method and system for a CTP battery pack. The method includes the following steps: constructing a temperature control structure model of the CTP battery pack, the temperature control structure model including several liquid cooling plates, each liquid cooling plate having a flow barrier disposed therein, the flow barrier being used to change the direction of a heat exchange medium so that the flow channel in each liquid cooling plate forms a reciprocating zigzag water jacket circulation, and presetting the initial length of the flow barrier and the initial apertures of the water inlet and outlet of each liquid cooling plate; obtaining parameter data for triggering temperature control activation of the CTP battery pack under a continuous overcharge state, simulating the temperature control structure model based on the parameter data, and obtaining a thermal simulation cloud map of each liquid cooling plate area; using the constructed temperature control structure model of the CTP battery pack, the method adjusts the length and inlet and outlet apertures of the flow barrier according to the simulation, optimizes the flow path and flow rate of the coolant in the liquid cooling plates, improves the temperature distribution of the battery pack, avoids local overheating or overcooling, and formulates a thermal management control strategy for the temperature control structure to ensure that the battery cells operate within an optimal temperature range, thereby improving the thermal management performance of the battery pack.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal management control of CTP battery packs, and in particular to a thermal management control method and system for a CTP battery pack. Background Art

[0002] New energy power batteries are widely used in various electric vehicles due to their high efficiency and environmentally friendly properties. However, battery performance is susceptible to temperature fluctuations, and both high and low temperatures can damage battery life. The application of thermal management devices and methods can effectively regulate battery temperature, ensuring that it operates in a suitable operating environment, thereby improving battery efficiency and safety. In addition, thermal management devices can also reduce safety risks caused by battery overheating and prevent accidents caused by thermal runaway. Therefore, thermal management devices are an indispensable and important component of battery packs and play a key role in improving the overall performance and safety of electric vehicles.

[0003] A liquid cooling plate assembly, a battery assembly and a vehicle with publication number CN219226418U, the liquid cooling plate assembly comprising: a harmonica tube comprising a plurality of cooling channels extending along the length of the harmonica tube, the side walls of the harmonica tube in the thickness direction forming a first heat dissipation portion, the harmonica tube being arranged between two battery cells for dissipating heat from the side walls of the two battery cells; and a cooling plate being arranged on at least one side in the width direction of the harmonica tube, forming a second heat dissipation portion for dissipating heat from a battery connecting piece connecting the two battery cells; the liquid cooling plate assembly utilizes the first heat dissipation portion to cool the large surfaces of the side walls of the battery cells, while also utilizing the second heat dissipation portion to absorb heat generated when current passes through the battery connecting piece, thereby cooling the battery connecting piece.

[0004] The existing liquid cooling plate assembly currently uses a large-area liquid cooling plate between the sides of the battery cell as a heat exchange device to cooperate with the heat conductive layer between the battery cell and the liquid cooling plate for rapid heat exchange. When designing the structural model, it is impossible to optimize the flow channel structure to improve the temperature distribution of the battery pack, resulting in local overheating or overcooling. It is also impossible to generate a targeted temperature control strategy for battery pack thermal management, and thus it is impossible to ensure that the battery cell operates in the most suitable temperature range, thereby reducing the thermal management performance of the battery pack. Summary of the Invention

[0005] In view of this, the present invention proposes a thermal management control method and system for a CTP battery pack. By constructing a temperature control structure model of the CTP battery pack and adjusting the length and inlet and outlet apertures of the flow-blocking bar according to simulation, the flow path and flow rate of the coolant in the liquid cooling plate can be optimized, the temperature distribution of the battery pack can be improved, and local overheating or overcooling can be avoided. A thermal management control strategy is formulated for the temperature control structure to ensure that the battery cells operate in the most suitable temperature range, thereby improving the thermal management performance of the battery pack.

[0006] The technical solution of the present invention is implemented as follows: The present invention provides a thermal management control method for a CTP battery pack, the method comprising the following steps:

[0007] S1. Construct a temperature control structure model for a CTP battery pack. The temperature control structure model includes several liquid cooling plates, each of which is provided with a flow-blocking bar. The flow-blocking bar is used to change the direction of the heat exchange medium so that the flow channel in each liquid cooling plate forms a reciprocating zigzag water jacket circulation. The initial length of the flow-blocking bar and the initial aperture of the water inlet and outlet of each liquid cooling plate are preset.

[0008] S2: Obtain parameter data for triggering temperature control in a continuous overcharge state for the CTP battery pack, simulate the temperature control structure model based on the parameter data, and obtain a thermal simulation cloud map of each liquid cooling plate area;

[0009] S3, adjusting the length of the corresponding flow control bar according to the thermal simulation cloud map of each liquid cooling plate to ensure uniform temperature distribution on each liquid cooling plate, and determining the final flow control bar length of each liquid cooling plate;

[0010] S4, based on the adjusted temperature control structure model, simulate the temperature control structure model, adjust the apertures of the water inlet and outlet of each liquid cooling plate, find the optimal aperture combination to maintain temperature balance, and obtain the corresponding flow curve;

[0011] S5, forming a final temperature control structure model of the CTP battery pack based on the final baffle length and optimal aperture combination of each liquid cooling plate;

[0012] S6, based on the final temperature control structure model, sets the battery pack temperature control strategy under different working conditions to control the thermal management of the battery pack.

[0013] On the basis of the above technical solution, preferably, the temperature control structure further includes a total water inlet pipeline and a total water outlet pipeline, wherein,

[0014] Several liquid cooling plates are arranged in sequence along the width direction, with the battery cells abutting between two adjacent liquid cooling plates. Each liquid cooling plate is provided with a water inlet and a water outlet.

[0015] The water inlet of each liquid cooling plate is connected to the main water inlet pipeline for supplying heat exchange medium to the liquid cooling plate, and the water outlet of each liquid cooling plate is connected to the main water outlet pipeline for circulation of heat exchange medium in the liquid cooling plate;

[0016] The water inlet end of the main water inlet pipeline and the water outlet end of the main water outlet pipeline are arranged on the same side.

[0017] On the basis of the above technical solution, preferably, the temperature control structure also includes a plurality of composite material strips and a thermal conductive adhesive layer, wherein symmetrically arranged composite material strips are provided on both sides of each liquid cooling plate, and a thermal conductive adhesive layer is provided between the two corresponding composite material strips on the same side, the battery core is abutted against the composite material strip through the thermal conductive adhesive layer, and the thermal conductive adhesive layer serves as a heat exchange and heat conductive medium for the battery core.

[0018] On the basis of the above technical solution, preferably, the liquid cooling plate further includes a first harmonica tube, a second harmonica tube, a first current collector, a second current collector and a crushing bar, wherein,

[0019] The first harmonica pipe and the second harmonica pipe are respectively arranged on both sides of the crushing bar, and a plurality of parallel flow channels are arranged in the first harmonica pipe and the second harmonica pipe;

[0020] There are two flow-blocking bars, which are respectively arranged on both sides of the second harmonica tube and are centrally symmetrically arranged, so that the heat exchange medium forms a back-and-forth zigzag flow in the parallel flow channels in the second harmonica tube;

[0021] The first current collector and the second current collector are respectively arranged on both sides of the first harmonica tube and the second harmonica tube, and the water inlet and the water outlet are both opened on the first current collector, the water inlet is connected with the liquid inlet end of the first harmonica tube, the liquid outlet end of the first harmonica tube is connected with one end of the second current collector, the other end of the second current collector is connected with the liquid inlet end of the second harmonica tube, and the liquid outlet end of the second harmonica tube is connected with the water outlet, so as to form a reciprocating zigzag water jacket circulation in the flow channel of each liquid cooling plate.

[0022] Based on the above technical solution, preferably, the step S2 of obtaining parameter data for triggering temperature control of the CTP battery pack in a continuous overcharge state, simulating the temperature control structure model according to the parameter data, and obtaining a thermal simulation cloud map of each liquid cooling plate area includes the following sub-steps:

[0023] Get the heat generation power of the CTP battery pack when continuously charging in the continuous overcharge state. The expression is:

[0024] P=I 2 *R

[0025] Where, P is heating power, I is peak current, and R is internal resistance of the battery cell;

[0026] Preset the supercharge cooling temperature threshold and the battery pack's suitable operating temperature, use the supercharge cooling temperature threshold as the inlet temperature of the temperature control structure, and use the battery pack's suitable operating temperature as the outlet temperature of the temperature control structure;

[0027] Calculate the temperature difference between the inlet and outlet of the temperature control structure based on the preset supercharge cooling temperature threshold and the appropriate operating temperature of the battery pack;

[0028] Select the heat exchange medium and calculate the inlet flow rate of the temperature control structure based on the heat generation power, heat exchange medium parameters and temperature difference in the supercharge state. The expression is:

[0029] V q =P / (C*ρ*△T)

[0030] Where V q is the inlet flow rate of the temperature control structure, P is the heating power in the supercharge state, C is the specific heat capacity of the heat exchange medium, △T is the temperature difference between the inlet and outlet of the temperature control structure, and ρ is the density of the heat exchange medium;

[0031] The heat generation power in the supercharging state, the inlet flow rate of the temperature control structure, the supercharging cooling temperature threshold, and the appropriate operating temperature of the battery pack are used as simulation input parameters. The simulation software is run to simulate the flow process of the heat exchange medium in the liquid cooling plate and the heat exchange process between the battery cell and the heat exchange medium, and a thermal simulation cloud map of each liquid cooling plate area is generated.

[0032] On the basis of the above technical solution, preferably, before step S3, it further includes constructing a prediction equation for the length of the choke bar, which includes the following sub-steps:

[0033] Using simulation software to simulate thermal simulation cloud maps under different choke bar lengths, and extracting the heat dissipation performance indicators of the liquid cooling plate from the thermal simulation cloud maps, the heat dissipation performance indicators including temperature gradient and temperature uniformity;

[0034] A data set was constructed based on the heat dissipation performance indicators under different choke bar lengths. The heat dissipation performance indicators and choke bar lengths were fitted based on the data set to construct a choke bar length prediction equation. The expression is:

[0035] G=c1L 2 +c2L+c3;

[0036] Where G is the heat dissipation performance of the liquid cooling plate, c1, c2, and c3 are the fitting coefficients, and L is the length of different flow control bars.

[0037] Based on the above technical solution, preferably, the step S3 includes adjusting the length of the corresponding flow blocking bar according to the thermal simulation cloud map of each liquid cooling plate to make the temperature distribution on each liquid cooling plate uniform and determining the final flow blocking bar length of each liquid cooling plate, including the following sub-steps:

[0038] According to the thermal simulation cloud map of each liquid cooling plate, the heat dissipation performance index of the corresponding liquid cooling plate is obtained respectively;

[0039] Based on the choke bar length prediction equation and the corresponding liquid cooling plate's heat dissipation performance index, the length of the choke bar in each liquid cooling plate is calculated and adjusted to ensure uniform temperature distribution on each liquid cooling plate. The final choke bar length of each liquid cooling plate is determined.

[0040] Based on the above technical solution, preferably, the temperature control structure model described in step S4 is simulated based on the adjusted temperature control structure model, the apertures of the water inlet and outlet of each liquid cooling plate are adjusted, and the optimal aperture combination for maintaining a balanced temperature is found to obtain a corresponding flow curve, which includes the following sub-steps:

[0041] Re-import the temperature control structure model after adjusting the length of the choke bar into the simulation software;

[0042] Preset the aperture range thresholds of the water inlet and outlet, define the pressure drop range of the temperature control structure, change the aperture sizes of the water inlet and outlet, and obtain the flow curves under different aperture sizes through simulation;

[0043] Based on the impact of different aperture sizes on flow and the changing trend of flow with pressure drop, the optimal aperture combination to maintain temperature balance is found, the aperture sizes of the water inlet and outlet of each liquid cooling plate are determined, and the corresponding flow curve is obtained.

[0044] On the basis of the above technical solution, preferably, in step S6, based on the final temperature control structure model, the battery pack temperature control strategy under different operating conditions is set to control the thermal management of the battery pack, wherein the battery pack includes slow charging and driving cooling conditions, supercharging cooling conditions, driving and slow charging heating conditions, supercharging heating conditions, supercharging uniform heating conditions, and slow charging and driving uniform heating conditions;

[0045] Under slow charging and driving cooling conditions, the corresponding battery pack control strategy is:

[0046] When the maximum temperature of the battery cell is T max ≥35℃ and the average temperature of the battery cell T avg When the temperature is ≥32.5℃, the temperature control strategy thermal management is triggered to perform thermal management control;

[0047] If the inlet water temperature is ≥25°C, the cooling mode is turned on, the inlet flow rate of the heat exchange medium is set to 15L / min, and the cooling water temperature is set to 20°C;

[0048] If the inlet water temperature is ≤15℃, start the circulation mode, set the inlet flow rate of the heat exchange medium to 15L / min, and the cooling water temperature to the inlet temperature value;

[0049] If the inlet water temperature is between 15 and 25°C, if the current mode is closed, then turn on the circulation mode and set the inlet flow rate of the heat exchange medium to 15L / min, otherwise keep the previous stage mode;

[0050] If the maximum temperature of the battery cell Tmax≤32℃ or Tavg≤29.5℃, select the shutdown mode, otherwise maintain the previous stage mode;

[0051] Under the supercharge cooling condition, the corresponding battery pack control strategy is:

[0052] When Tmax ≥ 30°C and the average temperature of the battery cell Tavg ≥ 27.5°C, the temperature control strategy thermal management is triggered for thermal management control;

[0053] If the inlet water temperature is ≥25°C, turn on the cooling mode, set the inlet flow rate of the heat exchange medium to 20L / min, and the cooling water temperature to 18°C;

[0054] If the inlet water temperature is ≤15℃, start the circulation mode, set the inlet flow rate of the heat exchange medium to 20L / min, and the cooling water temperature to the inlet temperature value;

[0055] If the inlet water temperature is between 15 and 25°C, if the current mode is closed, then turn on the circulation mode and set the inlet flow rate of the heat exchange medium to 20L / min, otherwise keep the previous stage mode;

[0056] If the maximum temperature of the battery cell is ≤25℃ or the average temperature of the battery cell is ≤22.5℃, select the shutdown mode, otherwise keep the previous stage mode;

[0057] Under driving and slow charging and heating conditions, the corresponding battery pack control strategy is:

[0058] When the minimum cell temperature T min ≤0℃ and the average temperature of the battery cell T avg When the temperature is ≤-2.5℃, the temperature control strategy thermal management is triggered to perform thermal management control;

[0059] If the inlet water temperature is ≤40℃, turn on the heating mode, set the inlet flow rate of the heat exchange medium to 15L / min, and the heating water temperature to 45℃;

[0060] If the inlet water temperature is between 35°C and 50°C, the circulation mode is turned on, the inlet flow rate of the heat exchange medium is set to 15L / min, and the water temperature is set to the inlet temperature value;

[0061] If the inlet water temperature is between 40 and 50°C, if the current mode is closed, then turn on the circulation mode and set the inlet flow rate of the heat exchange medium to 15L / min. Otherwise, maintain the previous mode.

[0062] If the minimum cell temperature T min ≥5℃ or the average temperature of the battery cell T avg ≥7.5℃, select the off mode, otherwise keep the previous mode;

[0063] Under the supercharging and heating conditions, the corresponding battery pack control strategy is:

[0064] When the minimum cell temperature T min≤15℃ and the average temperature of the battery cell T avg When the temperature is ≤17.5℃, the temperature control strategy thermal management is triggered to perform thermal management control;

[0065] If the inlet water temperature is ≤40℃, turn on the heating mode, set the inlet flow rate of the heat exchange medium to 15L / min, and the heating water temperature to 45℃;

[0066] If the inlet water temperature is ≥50°C, start the circulation mode, set the inlet flow rate of the heat exchange medium to 20L / min, and the cooling water temperature to the inlet temperature value;

[0067] If the inlet water temperature is between 40 and 50°C, if the current mode is closed, then turn on the circulation mode and set the inlet flow rate of the heat exchange medium to 20L / min. Otherwise, maintain the previous stage mode.

[0068] If the minimum cell temperature T min ≥20℃ or the average temperature of the battery cell T avg ≥22.5℃, select the off mode, otherwise keep the previous mode;

[0069] Under the supercharging and uniform heating conditions, the corresponding battery pack control strategy is:

[0070] When the maximum temperature of the battery cell is T max -Minimum cell temperature T min ≥8℃ and the maximum cell temperature T max ≤25℃ and the minimum cell temperature T min When the temperature is ≥15℃, start the circulation mode and set the inlet flow rate of the heat exchange medium to 15L / min;

[0071] When the maximum temperature of the battery cell is T max -Minimum cell temperature T min ≤3℃ or the minimum cell temperature T min <15℃ or the maximum temperature of the battery cell T max When the temperature is >25℃, exit the circulation mode;

[0072] Under slow charging and driving uniform heating conditions, the corresponding battery pack control strategy is:

[0073] When the maximum temperature of the battery cell is T max -Minimum cell temperature T min ≥5℃ and the maximum temperature of the battery cell T max ≤35℃ and the minimum cell temperature T min When the temperature is ≥0℃, the circulation mode is turned on and the inlet flow rate of the heat exchange medium is set to 15L / min;

[0074] When the maximum temperature of the battery cell is T max -Minimum cell temperature T min ≤3℃ or the minimum cell temperature Tmin <0℃ or the maximum temperature of the battery cell T max When the temperature is higher than 35℃, the circulation mode will be exited.

[0075] In a second aspect, the present invention further provides a thermal management control system for a CTP battery pack, the system comprising:

[0076] The initial model construction module is used to construct the temperature control structure model of the CTP battery pack. The temperature control structure model includes several liquid cooling plates, each of which is equipped with a flow barrier. The flow barrier is used to change the direction of the heat exchange medium so that the flow channel in each liquid cooling plate forms a reciprocating zigzag water jacket circulation. The initial length of the flow barrier and the initial aperture of the water inlet and outlet of each liquid cooling plate are preset;

[0077] The simulation module is used to obtain parameter data that triggers the activation of temperature control when the CTP battery pack is continuously overcharged. The temperature control structure model is simulated based on the parameter data to obtain thermal simulation cloud maps of each liquid cooling plate area.

[0078] The first adjustment module is used to adjust the length of the corresponding flow control bar according to the thermal simulation cloud map of each liquid cooling plate, so as to make the temperature distribution on each liquid cooling plate uniform and determine the final flow control bar length of each liquid cooling plate;

[0079] The second adjustment module is used to simulate the temperature control structure model based on the adjusted temperature control structure model, adjust the apertures of the water inlet and outlet of each liquid cooling plate, find the optimal aperture combination to maintain temperature balance, and obtain the corresponding flow curve;

[0080] A model determination module is used to form the final temperature control structure model of the CTP battery pack based on the final baffle length and optimal aperture combination of each liquid cooling plate;

[0081] The temperature control strategy module is used to set the battery pack temperature control strategy under different working conditions based on the final temperature control structure model to control the thermal management of the battery pack.

[0082] The thermal management control method and system of the CTP battery pack of the present invention have the following advantages over the prior art:

[0083] (1) By constructing a temperature control structure model of the CTP battery pack and its control strategy, and adjusting the length and inlet and outlet apertures of the flow-blocking bar according to the simulation, the flow path and flow rate of the coolant in the liquid cooling plate can be optimized, the temperature distribution of the battery pack can be improved, and the occurrence of local overheating or overcooling can be avoided, thereby significantly improving the thermal management performance of the battery pack.

[0084] (2) By constructing a prediction equation for the length of the choke bar, the optimal length of the choke bar can be quickly determined, which greatly shortens the design cycle and improves design efficiency. After adjusting the length of the choke bar, the heat dissipation performance of the liquid cooling plate can be significantly improved.

[0085] (3) By optimizing the aperture size of the water inlet and outlet of the liquid cooling plate, temperature balance and efficient heat dissipation performance can be achieved, thereby improving the stability and efficiency of the entire heat exchange system;

[0086] (4) The set battery pack temperature control strategy achieves precise management of the battery pack temperature through precise temperature monitoring, reasonable temperature control mode selection, and effective heat exchange medium control, thereby optimizing battery performance, ensuring battery safety, and improving the energy efficiency of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0087] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0088] Figure 1 Flowchart of the thermal management control method of the CTP battery pack of the present invention;

[0089] Figure 2 A three-dimensional diagram of the temperature control structure model of the thermal management control method for the CTP battery pack of the present invention;

[0090] Figure 3 A three-dimensional diagram of a liquid cooling plate of a temperature control structure model of a thermal management control method for a CTP battery pack of the present invention;

[0091] Figure 4 A three-dimensional diagram of the connection structure between the liquid cooling plate, composite material strips, and thermal conductive adhesive layer of the temperature control structure model of the thermal management control method for the CTP battery pack of the present invention;

[0092] Figure 5 A cross-sectional view of a liquid cooling plate of a temperature control structure model of a thermal management control method for a CTP battery pack of the present invention;

[0093] Figure 6 Flow distribution diagram of the thermal management control method for a CTP battery pack of the present invention;

[0094] Figure 7 This is a 5C supercharge performance test diagram of the thermal management control method of the CTP battery pack of the present invention;

[0095] Figure 8This is a 4C discharge performance test diagram of the thermal management control method of the CTP battery pack of the present invention. DETAILED DESCRIPTION

[0096] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0097] like Figure 1 As shown, a thermal management control method for a CTP battery pack of the present invention is characterized in that the method comprises the following steps:

[0098] S1. Construct a temperature control structure model of the CTP battery pack. The temperature control structure model includes several liquid cooling plates 1. Each liquid cooling plate 1 is provided with a flow blocking bar 11. The flow blocking bar 11 is used to change the direction of the heat exchange medium so that the flow channel in each liquid cooling plate 1 forms a reciprocating zigzag water jacket circulation. The initial length of the flow blocking bar 11 and the initial aperture of the water inlet 101 and the water outlet 102 of each liquid cooling plate 1 are preset.

[0099] It should be noted that during the design of the CTP battery pack, it is necessary to arrange a battery management system, temperature sensors, water inlets, water outlets, current collectors, water cooling plates, thermal conductive layers, etc.; when the temperature of the battery cell rises sharply during the charging and discharging process, the temperature sensor arranged on the top of the battery cell monitors the temperature of each battery cell in the entire pack in real time. When the maximum temperature reaches the threshold set by the battery management system, the water pump system on the vehicle end responds by opening the water inlet and outlet to allow coolant to flow in. By setting different temperatures and different flow rates, the appropriate coolant flows from the current collector at the front end of the water cooling system to the water cooling plate with a special flow channel for flow distribution to heat or cool the battery cell, so that the battery cell and battery pack can enter the most suitable temperature range in time during operation.

[0100] like Figure 2 As shown, the temperature control structure in this embodiment also includes a total water inlet pipeline 2 and a total water outlet pipeline 3, wherein a plurality of liquid cooling plates 1 are arranged in sequence along the width direction thereof, and the battery cells are abutted between two adjacent liquid cooling plates 1, and each liquid cooling plate 1 is provided with a water inlet 101 and a water outlet 102; the water inlet 101 of each liquid cooling plate 1 is connected to the total water inlet pipeline 2 for providing heat exchange medium to the liquid cooling plate 1, and the water outlet 102 of each liquid cooling plate 1 is connected to the total water outlet pipeline 3 for circulation of heat exchange medium in the liquid cooling plate 1; the water inlet end of the total water inlet pipeline 2 and the water outlet end of the total water outlet pipeline 3 are arranged on the same side.

[0101] It should be noted that the entire temperature control structure adopts a fully parallel design from the front to the rear liquid cooling plate. The total water inlet pipe 2 and the total water outlet pipe 3 are both on a single side of the liquid cooling plate, so that the assembly pipeline area is all on a single collector of the liquid cooling plate. The single collector is processed by an integrated machine with high precision, which solves the problem of high difficulty in the pipe crimping process due to entry and exit from both sides. At the same time, it is conducive to optimizing the internal spatial layout of the battery pack, reducing the space occupied by pipelines, and improving the energy density of the battery pack, so that when maintenance and inspection are required, the total water inlet pipe 2 and the total water outlet pipe 3 can be more conveniently approached and operated, reducing maintenance costs and time.

[0102] like Figure 4 As shown, in addition, the temperature control structure in this embodiment also includes a plurality of composite material strips 4 and a thermal conductive adhesive layer 5, wherein symmetrically arranged composite material strips 4 are provided on both sides of each liquid cooling plate 1, and a thermal conductive adhesive layer 5 is provided between the two corresponding composite material strips 4 on the same side, and the battery cell is abutted against the composite material strip 4 through the thermal conductive adhesive layer 5, and the thermal conductive adhesive layer 5 serves as a heat exchange and heat conductive medium for the battery cell.

[0103] It should be noted that during the process of directly gluing the bottom of the CTP battery cell side cooling structure to the bottom of the box body, the battery cell expansion cannot be effectively absorbed due to the lack of end plates to fix the side of the battery cell and the limited space. Especially at the end of the battery cell life, the battery cell expansion can reach 2% or more, and the expansion force can reach more than 60,000N, which has a significant impact on the safety and performance of the battery pack and the entire vehicle. In this embodiment, the composite material strip 4 is made of PC strips and PU foam. During the battery cell stacking process, the PC strips can ensure the minimum glue pressing amount while ensuring the consistency of the Block stacking size. In addition, the PU foam can effectively absorb the expansion of the battery cell during the battery cell expansion process.

[0104] like Figure 3 and Figure 5As shown, in addition, the liquid cooling plate 1 in this embodiment further includes a first harmonica tube 12, a second harmonica tube 13, a first current collector 14, a second current collector 15 and a crushing bar 16, wherein the first harmonica tube 12 and the second harmonica tube 13 are respectively arranged on both sides of the crushing bar 16, and a plurality of parallel flow channels are provided in the first harmonica tube 12 and the second harmonica tube 13; the number of the blocking bar 11 is two, and the two blocking bars 11 are respectively arranged on both sides of the second harmonica tube 13 and are centrally symmetrically arranged, so that the parallel flow channels of the heat exchange medium in the second harmonica tube 13 form a back-and-forth zigzag shape. flow; the first current collector 14 and the second current collector 15 are respectively arranged on both sides of the first harmonica tube 12 and the second harmonica tube 13, and the water inlet 101 and the water outlet 102 are both opened on the first current collector 14, the water inlet 101 is connected with the liquid inlet end of the first harmonica tube 12, the liquid outlet end of the first harmonica tube 12 is connected with one end of the second current collector 15, the other end of the second current collector 15 is connected with the liquid inlet end of the second harmonica tube 13, and the liquid outlet end of the second harmonica tube 13 is connected with the water outlet 102, so as to make the flow channel in each liquid cooling plate 1 form a reciprocating zigzag water jacket circulation.

[0105] It should be noted that a crush bar 16 is provided between the first harmonica tube 12 and the second harmonica tube 13. Both the DC channel and the bending channel are parallelograms. When the parallelogram channel is squeezed by the expansion force of the battery cell, the flow channel will be deformed. When the deformed area reaches the crush bar 16, since the crush bar 16 is solid, when the battery cell expands to this point, the first harmonica tube 12 and the second harmonica tube 13 will not be further crushed, thereby preventing the liquid cooling plate from being crushed due to the expansion of the battery cell at the end of its life, thereby improving the stability of the cooling structure.

[0106] Specifically, the material of the crushing bar 16 in this embodiment is preferably aluminum, and the solid structure of the crushing bar 16 is the same as the material of the liquid cooling plate, and the crushing bar 16 and the first harmonica tube 12 and the second harmonica tube 13 are integrally processed and formed.

[0107] Among them, several parallel flow channels are provided in the first harmonica tube 12 and the second harmonica tube 13, which are beneficial to reducing the resistance to fluid flow. Compared with vertical or horizontal partitions, inclined partitions can better guide the flow direction of the fluid, reduce eddy currents and turbulence in the flow process of the fluid, and help reduce the flow resistance of the fluid and improve the efficiency of the entire liquid cooling system.

[0108] The flow-blocking bar 11 in this embodiment is used to change the direction of the heat exchange medium, so that the flow channel in each liquid cooling plate 1 forms a reciprocating zigzag water jacket circulation, and the inner cavity of the second harmonica tube 13 is divided into a reciprocating zigzag flow channel, which not only increases the flow path length of the fluid in the tube, but also allows the fluid to change direction multiple times during the flow process. In addition, combined with the second current collector 15 and the first harmonica tube 12, the coating formed on the flow channel in the second harmonica tube 13 forms a reciprocating zigzag water jacket circulation, thereby enhancing the heat exchange effect between the fluid and the tube wall.

[0109] This embodiment adopts adjacent hot and cold flow channels. The liquid inlet flow channel of the second current collector 15 is the coldest area of ​​the flow channel in the cold plate, and the outlet flow channel of the first current collector 14 is the hottest area. The coldest area and the hottest area are arranged adjacent to each other, and thus will affect each other. The comprehensive temperature prevents the battery cell from being overcooled or overheated, and the temperature difference performance is better, thereby improving the heat exchange effect.

[0110] It can be understood that the width of the flow-blocking bar 11 matches the width of the second harmonica tube 2 , which effectively ensures the closed flow channel and prevents leakage of the fluid in the flow channel.

[0111] S2: Obtain parameter data for triggering temperature control of the CTP battery pack in a continuous overcharge state, simulate the temperature control structure model based on the parameter data, and obtain a thermal simulation cloud map of each liquid cooling plate area.

[0112] Step S2 includes the following sub-steps:

[0113] Get the heat generation power of the CTP battery pack when continuously charging in the continuous overcharge state. The expression is:

[0114] P=I 2 *R

[0115] Where, P is heating power, I is peak current, and R is internal resistance of the battery cell;

[0116] Preset the supercharge cooling temperature threshold and the battery pack's suitable operating temperature, use the supercharge cooling temperature threshold as the inlet temperature of the temperature control structure, and use the battery pack's suitable operating temperature as the outlet temperature of the temperature control structure;

[0117] Calculate the temperature difference between the inlet and outlet of the temperature control structure based on the preset supercharge cooling temperature threshold and the appropriate operating temperature of the battery pack;

[0118] Select the heat exchange medium and calculate the inlet flow rate of the temperature control structure based on the heat generation power, heat exchange medium parameters and temperature difference in the supercharge state. The expression is:

[0119] V q =P / (C*ρ*△T)

[0120] Where V qis the inlet flow rate of the temperature control structure, P is the heating power in the supercharge state, C is the specific heat capacity of the heat exchange medium, △T is the temperature difference between the inlet and outlet of the temperature control structure, and ρ is the density of the heat exchange medium;

[0121] The heat generation power in the supercharging state, the inlet flow rate of the temperature control structure, the supercharging cooling temperature threshold, and the suitable operating temperature of the battery pack are used as simulation input parameters. The simulation software is run to simulate the flow process of the heat exchange medium in the liquid cooling plate 1 and the heat exchange process between the battery cell and the heat exchange medium, and a thermal simulation cloud map of each liquid cooling plate 1 is generated.

[0122] It should be noted that based on the principles of thermodynamics and fluid mechanics, the heat generation of the CTP battery pack during continuous overcharging is calculated, and the supercharge cooling temperature threshold and the battery pack's optimal operating temperature are preset to determine the inlet and outlet temperature differential and inlet flow rate of the temperature control structure. Furthermore, simulation software is used to simulate the flow of the heat exchange medium within the liquid cooling plate and the heat exchange process between the battery cells and the heat exchange medium, generating a thermal simulation cloud map for each liquid cooling plate.

[0123] The step S3 also includes constructing a prediction equation for the length of the spoiler bar 11, which includes the following sub-steps:

[0124] Using simulation software to simulate thermal simulation cloud maps under different lengths of the flow control bar 11, the heat dissipation performance index of the liquid cooling plate 1 is extracted from the thermal simulation cloud map, wherein the heat dissipation performance index includes temperature gradient and temperature uniformity;

[0125] A data set is constructed based on the heat dissipation performance indicators under different lengths of the choke bar 11. The heat dissipation performance indicators and the length of the choke bar 11 are fitted according to the data set to construct a prediction equation for the length of the choke bar 11. The expression is:

[0126] G=c1L 2 +c2L+c3;

[0127] Where G is the heat dissipation performance of the liquid cooling plate, c1, c2 and c3 are the fitting coefficients, and L is the length of different flow control bars 11.

[0128] It should be noted that thermal simulation software is used to simulate the thermal simulation cloud map of the liquid cooling plate under different choke bar lengths, and key heat dissipation performance indicators are extracted from the thermal simulation cloud map. These indicators should be able to fully reflect the heat dissipation effect of the liquid cooling plate. The heat dissipation performance indicators include temperature gradient and temperature uniformity. The temperature gradient indicates how fast the temperature changes on the liquid cooling plate, while the temperature uniformity reflects the degree of proximity of the temperatures at various points on the liquid cooling plate. The heat dissipation performance indicators simulated under different choke bar lengths are combined with the corresponding choke bar lengths to construct a data set. The heat dissipation performance indicators and the choke bar length are fitted according to the data set to obtain the relationship between the heat dissipation performance indicators and the choke bar length, that is, the length prediction equation of the choke bar 11.

[0129] S3 , adjusting the length of the corresponding flow blocking bar 11 according to the thermal simulation cloud map of each liquid cooling plate 1 to make the temperature distribution on each liquid cooling plate 1 uniform, and determining the final flow blocking bar length of each liquid cooling plate 1 .

[0130] Step S3 includes the following sub-steps:

[0131] According to the thermal simulation cloud map of each liquid cooling plate 1, the heat dissipation performance index of the corresponding liquid cooling plate 1 is obtained respectively;

[0132] According to the prediction equation for the length of the baffle bar 11 and the heat dissipation performance index of the corresponding liquid cooling plate, the length of the baffle bar 11 in each liquid cooling plate is calculated and adjusted respectively to ensure uniform temperature distribution on each liquid cooling plate 1 and determine the final length of the baffle bar 11 of each liquid cooling plate 1.

[0133] It should be noted that thermal simulation software is used to perform thermal simulation analysis on each liquid cooling plate, and the thermal simulation cloud map is observed to identify the high-temperature and low-temperature areas on the liquid cooling plate. Based on the thermal simulation results, the key heat dissipation performance indicators are extracted. According to the choke bar length prediction equation and the current heat dissipation performance indicators of the liquid cooling plate, the preliminary choke bar length is calculated. This length should be able to improve the temperature distribution of the liquid cooling plate and make its temperature distribution more uniform.

[0134] It is understandable that the adjusted choke bar length is simulated and verified using thermal simulation software, and the simulation results are observed. If the simulation results do not meet the requirements, the choke bar length is further adjusted according to the simulation results, and the simulation verification and iterative adjustment process is repeated until the optimal choke bar length is found.

[0135] According to this embodiment, the length of the flow-blocking bars in the liquid cooling plate can be optimized, thereby improving the heat dissipation performance of the liquid cooling plate and ensuring a more uniform temperature distribution among the liquid cooling plates.

[0136] according to Figure 6 As shown, in S4, based on the adjusted temperature control structure model, the temperature control structure model is simulated, the apertures of the water inlet 101 and the water outlet 102 of each liquid cooling plate 1 are adjusted, and the optimal aperture combination for maintaining a balanced temperature is found to obtain a corresponding flow curve.

[0137] Step S4 includes the following sub-steps:

[0138] Re-import the temperature control structure model after adjusting the length of the choke bar 11 into the simulation software;

[0139] Preset the aperture range thresholds of the water inlet 101 and the water outlet 102, define the pressure drop range of the temperature control structure, change the aperture sizes of the water inlet 101 and the water outlet 102, and obtain the flow curves under different aperture sizes through simulation;

[0140] According to the influence of different aperture sizes on flow and the variation trend of flow with pressure drop, the optimal aperture combination to keep the temperature balanced is found, the aperture sizes of the water inlet 101 and the water outlet 102 of each liquid cooling plate are determined, and the corresponding flow curve is obtained.

[0141] It should be noted that the size of the aperture directly determines the flow rate of the coolant. A larger aperture can provide a greater flow rate, but may also result in an increased pressure drop. A smaller aperture, while reducing the pressure drop, may limit the flow rate and affect the heat dissipation effect. To achieve temperature balance, it is necessary to ensure that the coolant is evenly distributed within the liquid cooling plate and removes sufficient heat. Therefore, by optimizing the aperture sizes of the water inlet and outlet, the optimal aperture combination for maintaining temperature balance can be found. In this embodiment, simulation software is used to model and simulate the liquid cooling plate, which can simulate the flow curves and temperature distribution under different aperture sizes. Through comparative analysis, the optimal aperture combination can be found to achieve temperature balance and efficient heat dissipation performance.

[0142] In this embodiment, by optimizing the aperture sizes of the water inlet and outlet of the liquid cooling plate, temperature balance and efficient heat dissipation performance can be achieved, thereby improving the stability and efficiency of the entire heat exchange system.

[0143] S5 , forming a final temperature control structure model of the CTP battery pack according to the determined final length of the flow blocking bar 11 and the optimal aperture combination of each liquid cooling plate 1 .

[0144] S6, based on the final temperature control structure model, sets the battery pack temperature control strategy under different working conditions to control the thermal management of the battery pack.

[0145] Among them, the battery pack includes slow charging and driving cooling conditions, super charging cooling conditions, driving and slow charging heating conditions, super charging heating conditions, super charging uniform heating conditions and slow charging and driving uniform heating conditions;

[0146] Under slow charging and driving cooling conditions, the corresponding battery pack control strategy is:

[0147] When the maximum temperature of the battery cell is T max ≥35℃ and the average temperature of the battery cell T avg When the temperature is ≥32.5℃, the temperature control strategy thermal management is triggered to perform thermal management control;

[0148] If the inlet water temperature is ≥25°C, the cooling mode is turned on, the inlet flow rate of the heat exchange medium is set to 15L / min, and the cooling water temperature is set to 20°C;

[0149] If the inlet water temperature is ≤15℃, start the circulation mode, set the inlet flow rate of the heat exchange medium to 15L / min, and the cooling water temperature to the inlet temperature value;

[0150] If the inlet water temperature is between 15 and 25°C, if the current mode is closed, then turn on the circulation mode and set the inlet flow rate of the heat exchange medium to 15L / min, otherwise keep the previous stage mode;

[0151] If the maximum temperature of the battery cell Tmax≤32℃ or Tavg≤29.5℃, select the shutdown mode, otherwise maintain the previous stage mode;

[0152] Under the supercharge cooling condition, the corresponding battery pack control strategy is:

[0153] When Tmax ≥ 30°C and the average temperature of the battery cell Tavg ≥ 27.5°C, the temperature control strategy thermal management is triggered for thermal management control;

[0154] If the inlet water temperature is ≥25°C, turn on the cooling mode, set the inlet flow rate of the heat exchange medium to 20L / min, and the cooling water temperature to 18°C;

[0155] If the inlet water temperature is ≤15℃, start the circulation mode, set the inlet flow rate of the heat exchange medium to 20L / min, and the cooling water temperature to the inlet temperature value;

[0156] If the inlet water temperature is between 15 and 25°C, if the current mode is closed, then turn on the circulation mode and set the inlet flow rate of the heat exchange medium to 20L / min, otherwise keep the previous stage mode;

[0157] If the maximum temperature of the battery cell is ≤25℃ or the average temperature of the battery cell is ≤22.5℃, select the shutdown mode, otherwise keep the previous stage mode;

[0158] Under driving and slow charging and heating conditions, the corresponding battery pack control strategy is:

[0159] When the minimum cell temperature T min ≤0℃ and the average temperature of the battery cell T avg When the temperature is ≤-2.5℃, the temperature control strategy thermal management is triggered to perform thermal management control;

[0160] If the inlet water temperature is ≤40℃, turn on the heating mode, set the inlet flow rate of the heat exchange medium to 15L / min, and the heating water temperature to 45℃;

[0161] If the inlet water temperature is between 35°C and 50°C, the circulation mode is turned on, the inlet flow rate of the heat exchange medium is set to 15L / min, and the water temperature is set to the inlet temperature value;

[0162] If the inlet water temperature is between 40 and 50°C, if the current mode is closed, then turn on the circulation mode and set the inlet flow rate of the heat exchange medium to 15L / min. Otherwise, maintain the previous mode.

[0163] If the minimum cell temperature Tmin ≥5℃ or the average temperature of the battery cell T avg ≥7.5℃, select the off mode, otherwise keep the previous mode;

[0164] Under the supercharging and heating conditions, the corresponding battery pack control strategy is:

[0165] When the minimum cell temperature T min ≤15℃ and the average temperature of the battery cell T avg When the temperature is ≤17.5℃, the temperature control strategy thermal management is triggered to perform thermal management control;

[0166] If the inlet water temperature is ≤40℃, turn on the heating mode, set the inlet flow rate of the heat exchange medium to 15L / min, and the heating water temperature to 45℃;

[0167] If the inlet water temperature is ≥50°C, start the circulation mode, set the inlet flow rate of the heat exchange medium to 20L / min, and the cooling water temperature to the inlet temperature value;

[0168] If the inlet water temperature is between 40 and 50°C, if the current mode is closed, then turn on the circulation mode and set the inlet flow rate of the heat exchange medium to 20L / min. Otherwise, maintain the previous stage mode.

[0169] If the minimum cell temperature T min ≥20℃ or the average temperature of the battery cell T avg ≥22.5℃, select the off mode, otherwise keep the previous mode;

[0170] Under the supercharging and uniform heating conditions, the corresponding battery pack control strategy is:

[0171] When the maximum temperature of the battery cell is T max -Minimum cell temperature T min ≥8℃ and the maximum cell temperature T max ≤25℃ and the minimum cell temperature T min When the temperature is ≥15℃, start the circulation mode and set the inlet flow rate of the heat exchange medium to 15L / min;

[0172] When the maximum temperature of the battery cell is T max -Minimum cell temperature T min ≤3℃ or the minimum cell temperature T min <15℃ or the maximum temperature of the battery cell T max When the temperature is >25℃, exit the circulation mode;

[0173] Under slow charging and driving uniform heating conditions, the corresponding battery pack control strategy is:

[0174] When the maximum temperature of the battery cell is T max -Minimum cell temperature T min≥5℃ and the maximum temperature of the battery cell T max ≤35℃ and the minimum cell temperature T min When the temperature is ≥0℃, the circulation mode is turned on and the inlet flow rate of the heat exchange medium is set to 15L / min;

[0175] When the maximum temperature of the battery cell is T max -Minimum cell temperature T min ≤3℃ or the minimum cell temperature T min <0℃ or the maximum temperature of the battery cell T max When the temperature is higher than 35℃, the circulation mode will be exited.

[0176] It should be noted that the battery pack temperature control strategy achieves precise management of the battery pack temperature through precise temperature monitoring, reasonable temperature control mode selection, and effective heat exchange medium control, thereby optimizing battery performance, ensuring battery safety, and improving system energy efficiency.

[0177] according to Figure 7 and Figure 8 As shown, the supercharge test results of the CTP battery pack at room temperature of 25℃±2 are as follows: 0%~100% peak current 5C-625A peak power 445kW average current 3.2C-400A average power 286kW, battery cell Tmax=35℃, temperature difference 4℃; 100%~0% peak 5C peak current 4C-515A peak power 320kW average current 3.5C 441A average power 265kW; battery cell Tmax=31℃, temperature difference 3℃

[0178] In a second aspect, the present invention further provides a thermal management control system for a CTP battery pack, the system comprising:

[0179] An initial model construction module is used to construct a temperature control structure model of a CTP battery pack. The temperature control structure model includes several liquid cooling plates 1, each of which is provided with a flow blocking bar 11. The flow blocking bar 11 is used to change the direction of the heat exchange medium so that the flow channel in each liquid cooling plate 1 forms a reciprocating zigzag water jacket circulation. The initial length of the flow blocking bar 11 and the initial aperture of the water inlet 101 and the water outlet 102 of each liquid cooling plate 1 are preset;

[0180] The simulation module is used to obtain parameter data that triggers the activation of temperature control when the CTP battery pack is continuously overcharged. The temperature control structure model is simulated based on the parameter data to obtain thermal simulation cloud maps of each liquid cooling plate area.

[0181] The first adjustment module is used to adjust the length of the corresponding flow blocking bar according to the thermal simulation cloud map of each liquid cooling plate, so as to make the temperature distribution on each liquid cooling plate 1 uniform and determine the final flow blocking bar length of each liquid cooling plate 1;

[0182] The second adjustment module is used to simulate the temperature control structure model based on the adjusted temperature control structure model, adjust the apertures of the water inlet 101 and the water outlet 102 of each liquid cooling plate 1, find the optimal aperture combination to maintain a balanced temperature, and obtain the corresponding flow curve;

[0183] A model determination module is used to form a final temperature control structure model of the CTP battery pack based on the final length and optimal aperture combination of the flow blocking bar 11 of each liquid cooling plate 1;

[0184] The temperature control strategy module is used to set the battery pack temperature control strategy under different working conditions based on the final temperature control structure model to control the thermal management of the battery pack.

[0185] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A thermal management control method for a CTP battery pack, characterized in that: The method comprises the following steps: S1, constructing a temperature control structure model of a CTP battery pack, the temperature control structure model including a plurality of liquid cooling plates (1), each liquid cooling plate (1) being provided with a flow blocking bar (11), the flow blocking bar (11) being used to change the direction of the heat exchange medium so that the flow channel in each liquid cooling plate (1) forms a reciprocating zigzag water jacket circulation, and the initial length of the flow blocking bar (11) and the initial aperture of the water inlet (101) and the water outlet (102) of each liquid cooling plate (1) are preset; S2: Obtain parameter data for triggering temperature control in a continuous overcharge state for the CTP battery pack, simulate the temperature control structure model based on the parameter data, and obtain a thermal simulation cloud map of each liquid cooling plate area; S3, according to the thermal simulation cloud map of each liquid cooling plate, respectively adjust the length of the corresponding flow blocking bar (11) to make the temperature distribution on each liquid cooling plate (1) uniform, and determine the final flow blocking bar length of each liquid cooling plate (1); Simulating a thermal simulation cloud map under different lengths of the flow-blocking bar (11) using simulation software, and extracting a heat dissipation performance index of the liquid cooling plate (1) from the thermal simulation cloud map, wherein the heat dissipation performance index includes a temperature gradient and a temperature uniformity; A data set is constructed based on the heat dissipation performance indexes under different lengths of the choke strip (11). Based on the data set, the heat dissipation performance indexes and the length of the choke strip (11) are fitted to construct a prediction equation for the length of the choke strip (11). The expression is: G= c 1 L 2 + c 2 L + c 3； Where G is the heat dissipation performance of the liquid cooling plate, c 1. c 2 and c 3 is the coefficient obtained by fitting, L are different lengths of the flow blocking strip (11); S4, based on the adjusted temperature control structure model, simulating the temperature control structure model, adjusting the apertures of the water inlet (101) and the water outlet (102) of each liquid cooling plate (1), finding the optimal aperture combination for maintaining a balanced temperature, and obtaining a corresponding flow curve; S5, forming a final temperature control structure model of the CTP battery pack according to the final length of the flow blocking bar (11) and the optimal aperture combination of each liquid cooling plate (1); S6, based on the final temperature control structure model, sets the battery pack temperature control strategy under different working conditions to control the thermal management of the battery pack.

2. The thermal management control method for a CTP battery pack according to claim 1, wherein: The temperature control structure further comprises a main water inlet pipeline (2) and a main water outlet pipeline (3), wherein: A plurality of liquid cooling plates (1) are arranged in sequence and spaced apart along the width direction thereof, and the battery cells are abutted between two adjacent liquid cooling plates (1). Each liquid cooling plate (1) is provided with a water inlet (101) and a water outlet (102); The water inlet (101) of each liquid cooling plate (1) is connected to the main water inlet pipeline (2) for providing heat exchange medium into the liquid cooling plate (1); the water outlet (102) of each liquid cooling plate (1) is connected to the main water outlet pipeline (3) for circulating the heat exchange medium in the liquid cooling plate (1); The water inlet end of the main water inlet pipeline (2) and the water outlet end of the main water outlet pipeline (3) are arranged on the same side.

3. The thermal management control method for a CTP battery pack according to claim 2, wherein: The temperature control structure further comprises a plurality of composite material strips (4) and a thermal conductive adhesive layer (5), wherein both sides of each liquid cooling plate (1) are provided with symmetrically arranged composite material strips (4), a thermal conductive adhesive layer (5) is provided between two corresponding composite material strips (4) on the same side, the battery core is in contact with the composite material strips (4) via the thermal conductive adhesive layer (5), and the thermal conductive adhesive layer (5) serves as a heat exchange and heat conduction medium for the battery core.

4. The thermal management control method for a CTP battery pack according to claim 3, wherein: The liquid cooling plate (1) further includes a first harmonica tube (12), a second harmonica tube (13), a first current collector (14), a second current collector (15) and a crushing bar (16), wherein: The first harmonica tube (12) and the second harmonica tube (13) are respectively arranged on both sides of the crushing stop bar (16), and a plurality of parallel flow channels are provided in the first harmonica tube (12) and the second harmonica tube (13); The number of the flow-blocking bars (11) is two, and the two flow-blocking bars (11) are respectively arranged on both sides of the second harmonica tube (13) and are arranged in a centrally symmetrical manner, so that the heat exchange medium forms a back-and-forth zigzag flow in the parallel flow channels in the second harmonica tube (13); The first collector (14) and the second collector (15) are respectively arranged on both sides of the first harmonica tube (12) and the second harmonica tube (13); the water inlet (101) and the water outlet (102) are both opened on the first collector (14); the water inlet (101) is connected to the liquid inlet end of the first harmonica tube (12); the liquid outlet end of the first harmonica tube (12) is connected to one end of the second collector (15); the other end of the second collector (15) is connected to the liquid inlet end of the second harmonica tube (13); the liquid outlet end of the second harmonica tube (13) is connected to the water outlet (102), so as to form a reciprocating zigzag water jacket circulation in the flow channel of each liquid cooling plate (1).

5. The thermal management control method of a CTP battery pack according to claim 4, wherein: Step S2 includes obtaining parameter data for triggering temperature control of the CTP battery pack in a continuous overcharge state, simulating the temperature control structure model based on the parameter data, and obtaining a thermal simulation cloud map of each liquid cooling plate area, including the following sub-steps: Get the heat generation power of the CTP battery pack when continuously charging in the continuous overcharge state. The expression is: ； Where, P is heating power, I is peak current, and R is internal resistance of the battery cell; Preset the supercharge cooling temperature threshold and the battery pack's suitable operating temperature, use the supercharge cooling temperature threshold as the inlet temperature of the temperature control structure, and use the battery pack's suitable operating temperature as the outlet temperature of the temperature control structure; Calculate the temperature difference between the inlet and outlet of the temperature control structure based on the preset supercharge cooling temperature threshold and the appropriate operating temperature of the battery pack; Select the heat exchange medium and calculate the inlet flow rate of the temperature control structure based on the heat generation power, heat exchange medium parameters and temperature difference in the supercharge state. The expression is: ； Where V q is the inlet flow rate of the temperature control structure, P is the heating power in the supercharge state, C is the specific heat capacity of the heat exchange medium, △T is the temperature difference between the inlet and outlet of the temperature control structure, and ρ is the density of the heat exchange medium; The heat generation power in the supercharge state, the inlet flow rate of the temperature control structure, the supercharge cooling temperature threshold and the suitable operating temperature of the battery pack are used as simulation input parameters, and the simulation software is run to simulate the flow process of the heat exchange medium in the liquid cooling plate (1) and the heat exchange process between the battery cell and the heat exchange medium, and generate a thermal simulation cloud map of each liquid cooling plate (1).

6. The thermal management control method for a CTP battery pack according to claim 5, wherein: According to the thermal simulation cloud map of each liquid cooling plate (1), the length of the corresponding flow blocking bar (11) is adjusted respectively in step S3 so that the temperature distribution on each liquid cooling plate (1) is uniform, and the final flow blocking bar (11) length of each liquid cooling plate (1) is determined, which includes the following sub-steps: According to the thermal simulation cloud map of each liquid cooling plate (1), the heat dissipation performance index of the corresponding liquid cooling plate (1) is obtained respectively; According to the prediction equation of the length of the flow blocking bar (11) and the heat dissipation performance index of the corresponding liquid cooling plate, the length of the flow blocking bar (11) in each liquid cooling plate is calculated and adjusted respectively, so that the temperature distribution on each liquid cooling plate (1) is uniform, and the final length of the flow blocking bar (11) of each liquid cooling plate (1) is determined.

7. The thermal management control method of a CTP battery pack according to claim 6, wherein: The step S4 is based on the adjusted temperature control structure model, simulates the temperature control structure model, adjusts the apertures of the water inlet (101) and the water outlet (102) of each liquid cooling plate (1), finds the optimal aperture combination for maintaining a balanced temperature, and obtains the corresponding flow curve, including the following sub-steps: Re-import the temperature control structure model after adjusting the length of the flow-blocking bar (11) into the simulation software; Presetting the aperture range thresholds of the water inlet (101) and the water outlet (102), defining the pressure drop range of the temperature control structure, changing the aperture sizes of the water inlet (101) and the water outlet (102), and obtaining flow curves under different aperture sizes through simulation; According to the influence of different aperture sizes on the flow rate and the variation trend of the flow rate with the pressure drop, the optimal aperture combination for maintaining the temperature balance is found, the aperture sizes of the water inlet (101) and the water outlet (102) of each liquid cooling plate are determined, and the corresponding flow curve is obtained.

8. The thermal management control method for a CTP battery pack according to claim 7, wherein: In step S6, based on the final temperature control structure model, the battery pack temperature control strategy under different operating conditions is set to control the thermal management of the battery pack, wherein the battery pack includes slow charging and driving cooling condition, supercharging cooling condition, driving and slow charging heating condition, supercharging heating condition, supercharging uniform heating condition and slow charging and driving uniform heating condition; Under slow charging and driving cooling conditions, the corresponding battery pack control strategy is: When the maximum temperature of the battery cell is T max ≥35℃ and the average temperature of the battery cell T avg When the temperature is ≥32.5℃, the temperature control strategy thermal management is triggered to perform thermal management control; If the inlet water temperature is ≥25°C, the cooling mode is turned on, the inlet flow rate of the heat exchange medium is set to 15L / min, and the cooling water temperature is set to 20°C; If the inlet water temperature is ≤15℃, start the circulation mode, set the inlet flow rate of the heat exchange medium to 15L / min, and the cooling water temperature to the inlet temperature value; If the inlet water temperature is between 15 and 25°C, if the current mode is closed, then turn on the circulation mode and set the inlet flow rate of the heat exchange medium to 15L / min, otherwise keep the previous stage mode; If the maximum temperature of the battery cell Tmax≤32℃ or Tavg≤29.5℃, select the shutdown mode, otherwise maintain the previous stage mode; Under the supercharge cooling condition, the corresponding battery pack control strategy is: When Tmax ≥ 30°C and the average temperature of the battery cell Tavg ≥ 27.5°C, the temperature control strategy thermal management is triggered for thermal management control; If the inlet water temperature is ≥25°C, turn on the cooling mode, set the inlet flow rate of the heat exchange medium to 20L / min, and the cooling water temperature to 18°C; If the inlet water temperature is ≤15℃, start the circulation mode, set the inlet flow rate of the heat exchange medium to 20L / min, and the cooling water temperature to the inlet temperature value; If the inlet water temperature is between 15 and 25°C, if the current mode is closed, then turn on the circulation mode and set the inlet flow rate of the heat exchange medium to 20L / min, otherwise keep the previous stage mode; If the maximum temperature of the battery cell is ≤25℃ or the average temperature of the battery cell is ≤22.5℃, select the shutdown mode, otherwise keep the previous stage mode; Under driving and slow charging and heating conditions, the corresponding battery pack control strategy is: When the minimum cell temperature T min ≤0℃ and the average temperature of the battery cell T avg When the temperature is ≤-2.5℃, the temperature control strategy thermal management is triggered to perform thermal management control; If the inlet water temperature is ≤40℃, turn on the heating mode, set the inlet flow rate of the heat exchange medium to 15L / min, and the heating water temperature to 45℃; If the inlet water temperature is between 35°C and 50°C, the circulation mode is turned on, the inlet flow rate of the heat exchange medium is set to 15L / min, and the water temperature is set to the inlet temperature value; If the inlet water temperature is between 40 and 50°C, if the current mode is closed, then turn on the circulation mode and set the inlet flow rate of the heat exchange medium to 15L / min. Otherwise, maintain the previous mode. If the minimum cell temperature T min ≥5℃ or the average temperature of the battery cell T avg ≥7.5℃, select the off mode, otherwise keep the previous mode; Under the supercharging and heating conditions, the corresponding battery pack control strategy is: When the minimum cell temperature T min ≤15℃ and the average temperature of the battery cell T avg When the temperature is ≤17.5℃, the temperature control strategy thermal management is triggered to perform thermal management control; If the inlet water temperature is ≤40℃, turn on the heating mode, set the inlet flow rate of the heat exchange medium to 15L / min, and the heating water temperature to 45℃; If the inlet water temperature is ≥50°C, start the circulation mode, set the inlet flow rate of the heat exchange medium to 20L / min, and the cooling water temperature to the inlet temperature value; If the inlet water temperature is between 40 and 50°C, if the current mode is closed, then turn on the circulation mode and set the inlet flow rate of the heat exchange medium to 20L / min. Otherwise, maintain the previous stage mode. If the minimum cell temperature T min ≥20℃ or the average temperature of the battery cell T avg ≥22.5℃, select the off mode, otherwise keep the previous mode; Under the supercharging and uniform heating conditions, the corresponding battery pack control strategy is: When the maximum temperature of the battery cell is T max -Minimum cell temperature T min ≥8℃ and the maximum cell temperature T max ≤25℃ and the minimum cell temperature T min When the temperature is ≥15℃, start the circulation mode and set the inlet flow rate of the heat exchange medium to 15L / min; When the maximum temperature of the battery cell is T max -Minimum cell temperature T min ≤3℃ or the minimum cell temperature T min <15℃ or the maximum temperature of the battery cell T max When the temperature is >25℃, exit the circulation mode; Under slow charging and driving uniform heating conditions, the corresponding battery pack control strategy is: When the maximum temperature of the battery cell is T max -Minimum cell temperature T min ≥5℃ and the maximum temperature of the battery cell T max ≤35℃ and the minimum cell temperature T min When the temperature is ≥0℃, the circulation mode is turned on and the inlet flow rate of the heat exchange medium is set to 15L / min; When the maximum temperature of the battery cell is T max -Minimum cell temperature T min ≤3℃ or the minimum cell temperature T min <0℃ or the maximum temperature of the battery cell T max When the temperature is higher than 35℃, the circulation mode will be exited.

9. A thermal management control system for a CTP battery pack, implemented by the thermal management control method for a CTP battery pack according to any one of claims 1 to 8, characterized in that: The system comprises: An initial model construction module is used to construct a temperature control structure model of a CTP battery pack, wherein the temperature control structure model includes a plurality of liquid cooling plates (1), each liquid cooling plate (1) is provided with a flow blocking bar (11), the flow blocking bar (11) is used to change the direction of the heat exchange medium so that the flow channel in each liquid cooling plate (1) forms a reciprocating zigzag water jacket circulation, and the initial length of the flow blocking bar (11) and the initial aperture of the water inlet (101) and the water outlet (102) of each liquid cooling plate (1) are preset; The simulation module is used to obtain parameter data that triggers the activation of temperature control when the CTP battery pack is continuously overcharged. The temperature control structure model is simulated based on the parameter data to obtain thermal simulation cloud maps of each liquid cooling plate area. The first adjustment module is used to adjust the length of the corresponding flow blocking bar according to the thermal simulation cloud map of each liquid cooling plate, so that the temperature distribution on each liquid cooling plate (1) is uniform, and the final flow blocking bar length of each liquid cooling plate (1) is determined; The second adjustment module is used to simulate the temperature control structure model based on the adjusted temperature control structure model, adjust the apertures of the water inlet (101) and the water outlet (102) of each liquid cooling plate (1), find the optimal aperture combination for maintaining a balanced temperature, and obtain a corresponding flow curve; A model determination module is used to form a final temperature control structure model of the CTP battery pack according to the final length of the flow blocking bar (11) and the optimal aperture combination of each liquid cooling plate (1); The temperature control strategy module is used to set the battery pack temperature control strategy under different working conditions based on the final temperature control structure model to control the thermal management of the battery pack.

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