A battery temperature control method, control device and battery assembly

Abstract

This invention discloses a battery temperature control method, control device, and battery assembly. The battery temperature control method is adapted to a battery assembly with a liquid cooling system. The liquid cooling system has a liquid cooling component that exchanges heat with the battery gap. The battery temperature control method includes the following steps: during battery charging and discharging, acquiring the inlet temperature and outlet temperature of the liquid cooling component; and controlling the operation of the battery and / or the liquid cooling system based on the temperature difference between the inlet temperature and the outlet temperature, so that the temperature difference is maintained within a set range. This invention aims to solve the problem that a large difference between the supply water temperature of the liquid cooling unit and the control temperature of the battery cell results in a significant impact of cold shock on the battery cell, leading to localized temperature rise and increased temperature difference, thus affecting the battery cell's lifespan.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and specifically to a battery temperature control method, control device, and battery assembly. Background Technology

[0002] Temperature is a crucial factor affecting battery performance and lifespan. During charging and discharging, battery modules inevitably generate heat. Therefore, in the battery industry, liquid cooling plates are typically installed within the battery module to improve heat dissipation efficiency. A battery module usually contains multiple cell groups, each composed of multiple cells. Current technology primarily uses liquid cooling units to control the temperature of the cell groups. The typical supply water temperature of these liquid cooling units is 15-120℃, with a low inlet temperature. During operation, the cells are generally set to 30℃ for intelligent temperature control. The problem is that the supply water temperature of the liquid cooling unit differs significantly from the controlled temperature of the cells. This results in a large impact of cold shock on the heat source (the cells), leading to increased localized temperature rise and temperature differences, thus affecting the lifespan of the cells.

[0003] During the operation of the liquid-cooled module, if the inlet temperature of the coolant is too low, a temperature difference peak will appear during operation, causing the temperature difference of the liquid-cooled module to increase sharply, which will affect the consistency of the battery cells. Summary of the Invention

[0004] The main objective of this invention is to propose a battery temperature control method, control device, and battery assembly, aiming to solve the problem that the large difference between the water supply temperature of the liquid cooling unit and the control temperature of the battery cell makes cold shock have a significant impact on the battery cell, resulting in local temperature rise and increased temperature difference, which affects the life of the battery cell.

[0005] In view of this, the present invention proposes a battery temperature control method, adapted to a battery assembly with a liquid cooling system, wherein the liquid cooling system has a liquid cooling component that exchanges heat with the battery gap, characterized in that the battery temperature control method includes the following steps:

[0006] During battery charging and discharging, the inlet and outlet temperatures of the liquid cooling components are obtained;

[0007] The battery and / or liquid cooling system are controlled to operate based on the temperature difference between the inlet temperature and the outlet temperature, so that the temperature difference is maintained within a set range.

[0008] Optionally, the step of controlling the operation of the battery and / or liquid cooling system based on the temperature difference between the inlet temperature and the outlet temperature to maintain the temperature difference within a set range includes:

[0009] Determine whether the temperature difference value is within the set range;

[0010] If so, the liquid cooling component will maintain its current operating parameters.

[0011] If not, the liquid cooling assembly adjusts the inlet temperature by changing the current operating parameters.

[0012] Optionally, if so, after the step of maintaining the current operating parameters of the liquid cooling component, the method further includes:

[0013] Determine whether the difference between the temperature difference and the maximum threshold of the set range is less than or equal to a preset value;

[0014] If so, then reduce the power of the battery for charging and discharging;

[0015] If not, the battery will continue to charge and discharge at the current power.

[0016] Optionally, the preset value is 2°C.

[0017] Optionally, the step of controlling the operation of the battery and / or liquid cooling system based on the temperature difference between the inlet temperature and the outlet temperature to maintain the temperature difference within a set range includes:

[0018] Determine whether the temperature difference value is within the set range;

[0019] If so, the battery will continue to charge and discharge at the current power.

[0020] If not, then reduce the power of the battery for charging and discharging.

[0021] Optionally, the set range is between 1°C and 5°C.

[0022] The present invention also proposes a control device, including a memory, a processor, and a battery temperature control program stored thereon and executable on the processor, the battery temperature control program being configured to implement the steps of the battery temperature control method as described above.

[0023] The present invention also proposes a battery assembly, the battery assembly including a battery, a liquid cooling system, a temperature detection device, and a control device. The liquid cooling system includes a liquid cooling component, which is correspondingly arranged with the battery to exchange heat with the battery. The temperature detection device is used to detect the inlet temperature and outlet temperature of the liquid cooling component. The control device is electrically connected to the temperature detection device, and the control device includes the control device described above.

[0024] Optionally, the liquid cooling assembly includes a liquid cooling plate mounted on the bottom of the battery.

[0025] Optionally, the temperature detection device includes two temperature sensors, which are respectively located at the inlet and outlet of the liquid cooling component.

[0026] In the technical solution of this invention, during the battery charging and discharging process, the inlet and outlet temperatures of the liquid cooling component are monitored in real time. The inlet and outlet temperatures are obtained through a control device, and the temperature difference between the inlet and outlet temperatures is calculated. If the temperature difference is maintained within a set range, the battery temperature difference is controlled within a suitable range, ensuring the consistency of temperature fluctuations throughout the battery during the entire operation of the liquid cooling component, thereby improving the battery's lifespan. If the temperature difference is not within the set range, the temperature difference can be maintained within the set range by adjusting the battery charging and discharging power, adjusting the inlet temperature of the liquid cooling component, or simultaneously adjusting the battery charging and discharging power and adjusting the inlet temperature of the liquid cooling component, to ensure consistent temperature fluctuations throughout the battery. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0028] Figure 1 A schematic flowchart of an embodiment of the battery temperature control method provided by the present invention;

[0029] Figure 2 for Figure 1 A schematic diagram of the structure of the control device for the hardware operating environment involved in the embodiment of the Chinese version;

[0030] Figure 3 This is a schematic diagram of the battery assembly provided by the present invention;

[0031] Figure 4 This is a schematic diagram of the battery assembly provided by the present invention from another perspective.

[0032] Explanation of icon numbers:

[0033]

[0034]

[0035] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0037] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0038] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0039] Temperature is a crucial factor affecting battery performance and lifespan. During charging and discharging, battery modules inevitably generate heat. Therefore, in the battery industry, liquid cooling plates are typically installed within the battery module to improve heat dissipation efficiency. A battery module usually contains multiple cell groups, each composed of multiple cells. Current technology primarily uses liquid cooling units to control the temperature of the cell groups. The typical supply water temperature of these liquid cooling units is 15-120℃, with a low inlet temperature. During operation, the cells are generally set to 30℃ for intelligent temperature control. The problem is that the supply water temperature of the liquid cooling unit differs significantly from the controlled temperature of the cells. This results in a large impact of cold shock on the heat source (the cells), leading to increased localized temperature rise and temperature differences, thus affecting the lifespan of the cells.

[0040] During the operation of the liquid-cooled module, if the inlet temperature of the coolant is too low, a temperature difference peak will appear during operation, causing the temperature difference of the liquid-cooled module to increase sharply, which will affect the consistency of the battery cells.

[0041] In view of this, the present invention proposes a method for controlling the temperature of a battery. Figures 1 to 4This is one embodiment of the present invention.

[0042] Please see Figure 1 The temperature control method for the battery 1 is adapted to a battery assembly 100 having a liquid cooling system 2, the liquid cooling system 2 having a liquid cooling component 21 that exchanges heat with the battery 1 through a gap, characterized in that the temperature control method for the battery 1 includes the following steps:

[0043] S1: During the charging and discharging process of battery 1, obtain the inlet temperature and outlet temperature of liquid cooling component 21;

[0044] S2: Based on the temperature difference between the inlet temperature and the outlet temperature, control the operation of battery 1 and / or liquid cooling system 2 so that the temperature difference is maintained within a set range.

[0045] In the technical solution of this invention, during the charging and discharging process of battery 1, the inlet temperature and outlet temperature of the liquid cooling component 21 are detected in real time. The inlet temperature and outlet temperature are obtained by the control device 1000, and the temperature difference between the inlet temperature and outlet temperature is calculated. If the temperature difference is maintained within the set range, the temperature difference of battery 1 is controlled within a suitable range, which can ensure the consistency of temperature fluctuation at all parts of battery 1 during the entire operation of liquid cooling component 21, thereby improving the service life of battery 1. If the temperature difference is not within the set range, the temperature difference can be maintained within the set range by adjusting the charging and discharging power of battery 1, adjusting the inlet temperature of liquid cooling component 21, or simultaneously adjusting the charging and discharging power of battery 1 and adjusting the inlet temperature of liquid cooling component 21, so as to ensure that the temperature fluctuation at all parts of battery 1 is consistent.

[0046] It should be noted that, in order to make the temperature difference at various parts of the battery 1 more consistent, in one embodiment of the present invention, the set range is between 1°C and 5°C. Preferably, the temperature difference can be maintained between 2°C and 3°C by the control device 1000.

[0047] In the above-described technical solution for adjusting the charging and discharging power of battery 1, step S2: controlling the operation of battery 1 and / or liquid cooling system 2 based on the temperature difference between the inlet temperature and the outlet temperature, so that the temperature difference is maintained within a set range, includes:

[0048] S11: Determine whether the temperature difference value is within the set range;

[0049] S12: If so, then maintain the battery 1 charging and discharging at the current power;

[0050] S13: If not, reduce the power of the battery 1 for charging and discharging.

[0051] By detecting whether the temperature difference is within a set range, if the temperature difference is within the set range, the battery 1 maintains the current power for charging and discharging; if the temperature difference is not within the set range, the battery 1 reduces the current power for charging and discharging to bring the temperature difference within the set range.

[0052] It is understandable that by reducing the current power of the battery 1 for charging and discharging, the essence is to reduce the heat dissipated by the battery 1 itself during operation. After the heat of the battery 1 is reduced, the temperature of the refrigerant at the outlet of the liquid cooling component 21 decreases when it flows from the inlet to the outlet. That is, by reducing the outlet temperature of the liquid cooling component 21, the temperature difference is kept within a set range.

[0053] In the technical solution for adjusting the inlet temperature of the liquid cooling component 21 described above, step S2: controlling the operation of the battery 1 and / or the liquid cooling system 2 based on the temperature difference between the inlet temperature and the outlet temperature, so that the temperature difference is maintained within a set range, includes:

[0054] S14: Determine whether the temperature difference value is within the set range;

[0055] S15: If so, the liquid cooling component 21 maintains its current operating parameters;

[0056] S16: If not, the liquid cooling component 21 adjusts the inlet temperature by changing the current operating parameters.

[0057] By detecting whether the temperature difference is within the set range, if the temperature difference is within the set range, the liquid cooling component 21 maintains the current operating parameters. If the temperature difference is not within the set range, the liquid cooling component 21 adjusts the inlet temperature by changing the current operating parameters, so that the inlet temperature is closer to the temperature of the battery 1.

[0058] The method of adjusting the inlet temperature is not limited. It can be achieved by heating the refrigerant entering the liquid cooling component 21 through a heating device, or the liquid cooling component 21 itself can have a heating function.

[0059] It is understandable that by adjusting the inlet temperature of the liquid cooling component 21, the temperature difference can be maintained within the set range. Compared with the above-mentioned scheme of adjusting the charging and discharging power of the battery 1, it can keep the temperature difference of the battery 1 consistent while not affecting the working efficiency of the battery 1.

[0060] Further, after step S15: If so, the liquid cooling assembly 21 continues to operate with its current operating parameters, the process further includes:

[0061] S151: Determine whether the difference between the temperature difference and the maximum threshold of the set range is less than or equal to a preset value;

[0062] S152: If so, reduce the power of the battery 1 for charging and discharging;

[0063] S153: If not, then maintain the battery 1 charging and discharging at the current power.

[0064] When the temperature difference is within the set range, if the difference between the temperature difference and the maximum threshold of the set range is less than or equal to a preset value, the power of the battery 1 can be reduced for charging and discharging, thereby maintaining the temperature difference within the preferred temperature range mentioned above. If the temperature difference is greater than the maximum threshold of the set range, the battery 1 is maintained at the current power for charging and discharging.

[0065] In one embodiment of the present invention, the preset value is 2°C.

[0066] Please see Figure 2 The present invention also proposes a control device 1000, which may include: a processor 1001, such as a CPU; a communication bus 1002; a user structure 1003; a network interface 1004; and a memory 1005. The communication bus 1002 is used to enable communication between these components. The user structure 1003 may include a display screen and an input unit such as a keyboard; optionally, the user structure 1003 may also include a standard wired interface or a wireless interface. The network interface 1004 may optionally include a standard wired interface or a wireless interface (such as a Wi-Fi interface). The memory 1005 may be a high-speed RAM memory or a stable, non-volatile memory, such as a disk storage device. Optionally, the memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0067] Those skilled in the art will understand that Figure 2 The structure of the control device 1000 shown does not constitute a limitation on the control device 1000. It may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0068] exist Figure 2 In the control device 1000, the processor 1001 can call the battery 1 temperature control program stored in the memory 1005 and perform the following operations:

[0069] S1: During the charging and discharging process of battery 1, obtain the inlet temperature and outlet temperature of liquid cooling component 21;

[0070] S2: Based on the temperature difference between the inlet temperature and the outlet temperature, control the operation of battery 1 and / or liquid cooling system 2 to maintain the temperature difference within a set range.

[0071] Furthermore, the processor 1001 can call the battery 1 temperature control program stored in the memory 1005 and also perform the following operations:

[0072] S11: Determine whether the temperature difference value is within the set range;

[0073] S12: If so, then maintain the battery 1 charging and discharging at the current power;

[0074] S13: If not, reduce the power of the battery 1 for charging and discharging.

[0075] Furthermore, the processor 1001 can call the battery 1 temperature control program stored in the memory 1005 and also perform the following operations:

[0076] S14: Determine whether the temperature difference value is within the set range;

[0077] S15: If so, the liquid cooling component 21 maintains its current operating parameters;

[0078] S16: If not, the liquid cooling component 21 adjusts the inlet temperature by changing the current operating parameters.

[0079] Furthermore, the processor 1001 can call the battery 1 temperature control program stored in the memory 1005 and also perform the following operations:

[0080] S151: Determine whether the difference between the temperature difference and the maximum threshold of the set range is less than or equal to a preset value;

[0081] S152: If so, reduce the power of the battery 1 for charging and discharging;

[0082] S153: If not, then maintain the battery 1 charging and discharging at the current power.

[0083] Please see Figures 3 to 4The present invention also proposes a battery assembly 100, which includes a battery 1, a liquid cooling system 2, a temperature detection device 3, and a control device 1000. The liquid cooling system 2 includes a liquid cooling component 21, which is correspondingly arranged with the battery 1 to exchange heat with the battery 1. The temperature detection device 3 is used to detect the inlet temperature and outlet temperature of the liquid cooling component 21. The control device 1000 is electrically connected to the temperature detection device 3. The control device 1000 includes a memory 1005, a processor 1001, and a battery 1 temperature control program stored thereon and executable on the processor 1001. The battery 1 temperature control program is configured to implement the steps of the battery 1 temperature control method as described above. Since the battery assembly 100 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0084] During the charging and discharging process of battery 1, the temperature detection device 3 monitors the inlet and outlet temperatures of the liquid cooling component 21 in real time. The control device 1000 obtains the inlet and outlet temperatures and calculates the temperature difference between them. If the temperature difference is maintained within a set range, the temperature difference of battery 1 is controlled within a suitable range, ensuring the consistency of temperature fluctuations throughout the operation of the liquid cooling component 21 and thus improving the service life of battery 1. If the temperature difference is not within the set range, the temperature difference can be maintained within the set range by adjusting the charging and discharging power of battery 1, adjusting the inlet temperature of the liquid cooling component 21, or simultaneously adjusting both the charging and discharging power of battery 1 and the inlet temperature of the liquid cooling component 21, to ensure consistent temperature fluctuations throughout battery 1.

[0085] Furthermore, the liquid cooling assembly 21 includes a liquid cooling plate 211, which is mounted on the bottom of the battery 1. By fitting the liquid cooling plate 211 against the bottom of the battery 1, a refrigerant flows through the liquid cooling plate 211 to exchange heat with the battery 1.

[0086] Furthermore, the temperature detection device 3 includes two temperature sensors 31, which are respectively located at the inlet and outlet positions of the liquid cooling assembly 21. That is, in one embodiment of the present invention, the temperature at the inlet and outlet positions of the liquid cooling assembly 21 is detected by using two temperature sensors 31.

[0087] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A method for controlling the temperature of a battery, adapted to a battery assembly having a liquid cooling system, said liquid cooling system having a liquid cooling component that exchanges heat with the battery gap, characterized in that, The battery temperature control method includes the following steps: During battery charging and discharging, the inlet and outlet temperatures of the liquid cooling components are obtained; Based on the temperature difference between the inlet temperature and the outlet temperature, the operation of the battery and / or liquid cooling system is controlled so that the temperature difference is maintained within a set range. The step of controlling the operation of the battery and / or liquid cooling system based on the temperature difference between the inlet temperature and the outlet temperature to maintain the temperature difference within a set range includes: Determine whether the temperature difference value is within the set range; If so, the liquid cooling component will maintain its current operating parameters. If not, the liquid cooling assembly adjusts the inlet temperature by changing the current operating parameters; If so, after the step of maintaining the current operating parameters of the liquid cooling component, the method further includes: Determine whether the difference between the temperature difference and the maximum threshold of the set range is less than or equal to a preset value; If so, then reduce the power of the battery for charging and discharging; If not, the battery will continue to charge and discharge at the current power.

2. The battery temperature control method as described in claim 1, characterized in that, The preset value is 2℃.

3. The battery temperature control method as described in claim 1, characterized in that, The set range is between 1°C and 5°C.

4. A control device, characterized in that, The device includes a memory, a processor, and a battery temperature control program stored thereon and executable on the processor, the battery temperature control program being configured to implement the steps of the battery temperature control method as claimed in any one of claims 1 to 3.

5. A battery assembly, characterized in that, include: Battery; A liquid cooling system, comprising a liquid cooling component, wherein the liquid cooling component is configured correspondingly to the battery so as to exchange heat with the battery; A temperature detection device is used to detect the inlet temperature and outlet temperature of the liquid cooling assembly; as well as, A control device, electrically connected to the temperature detection device, includes the control device as described in claim 4.

6. The battery assembly as claimed in claim 5, characterized in that, The liquid cooling assembly includes a liquid cooling plate, which is mounted on the bottom of the battery.

7. The battery assembly as claimed in claim 5, characterized in that, The temperature detection device includes two temperature sensors, which are respectively located at the inlet and outlet of the liquid cooling component.

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