Battery cell cooling system and control method therefor

Abstract

Provided are a battery cell cooling system and a control method therefor. The battery cell cooling system comprises a first cooling module and a second cooling module, which cool a first side (110) and a second side (120) of a battery cell (100), respectively. The first cooling module is used, when a first actual temperature of the first side (110) of the cell (100) is lower than a first temperature threshold, to determine whether the difference between the first actual temperature and a second actual temperature of the second side (120) of the battery cell (100) is greater than a first temperature difference threshold, and, if the difference is greater than the first temperature difference threshold, to control a cooling medium of the first cooling module to flow and carry out refrigeration. The second cooling module is used, when the second actual temperature is lower than a third temperature threshold value, to determine whether the difference between the second actual temperature and the first actual temperature is greater than a third temperature difference threshold value, and, if the difference is greater than the third temperature difference threshold value, to control a cooling medium of the second cooling module to flow and carry out refrigeration. The two cooling modules each execute the same control method, and independent control is carried out on the two sides of the battery cell, which can reduce the temperature difference between the two opposite sides of the battery cell, improving battery cell performance, and can improve the usage safety of the battery cell cooling system.

Description

Battery core cooling system and control method thereof Technical Field

[0001] The present invention relates to, but is not limited to, the field of battery technology, and in particular to a battery cell cooling system and a control method thereof. Background Art

[0002] As the capacity of lithium-ion battery cells continues to increase, the impact of thermal management systems on lithium-ion battery performance is becoming increasingly significant, both in the electric vehicle industry and in the electrochemical energy storage industry. Liquid cooling is currently the most common method of heat dissipation, typically by placing a liquid cooling plate at the bottom of the battery cell and introducing a refrigerant into the plate to dissipate heat from the bottom of the cell.

[0003] However, the temperature of the upper part of the battery cell will also increase with the increase of usage time, which will lead to a large temperature difference between the upper and lower parts of the battery cell, and thus have an adverse effect on the thermal stress, capacity and life of the battery cell.

[0004] Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art, and proposes a battery core cooling system and a control method thereof to reduce the temperature difference between the two sides of the battery core.

[0006] In order to achieve the purpose of the present invention, a control method for a battery cell cooling system is provided, the battery cell cooling system includes a first cooling module and a second cooling module, the first cooling module is used to cool the first side of the battery cell, and the second cooling module is used to cool the second side of the battery cell opposite to the first side; the first cooling module and the second cooling module both have a first state in which a cooling medium flows and refrigeration is performed and a second state in which the cooling medium flows and no refrigeration is performed; the control method of the first cooling module includes: obtaining a first actual temperature of the first side of the battery cell and a second actual temperature of the second side of the battery cell; when the first actual temperature is less than a pre-stored first temperature threshold, comparing the difference between the first actual temperature and the second actual temperature with a pre-stored first temperature difference threshold; between the first actual temperature and the second actual temperature When the difference is greater than the first temperature difference threshold, the first cooling module is controlled to be in the first state; the first actual temperature of the first side of the battery cell and the second actual temperature of the second side of the battery cell are obtained; the control method of the second cooling module includes: obtaining the first actual temperature of the first side of the battery cell and the second actual temperature of the second side of the battery cell; when the second actual temperature is less than the pre-stored third temperature threshold, the difference between the second actual temperature and the first actual temperature is compared with the pre-stored third temperature difference threshold; when the difference between the second actual temperature and the first actual temperature is greater than the third temperature difference threshold, the second cooling module is controlled to be in the first state; the first actual temperature of the first side of the battery cell and the second actual temperature of the second side of the battery cell are obtained; wherein, the control methods executed by the first cooling module and the second cooling module are independent of each other.

[0007] Optionally, the control method of the first cooling module includes: when the first actual temperature is greater than or equal to the first temperature threshold, comparing the first actual temperature with a pre-stored second temperature threshold; when the first actual temperature is greater than or equal to the second temperature threshold, controlling the first cooling module to be in the first state; returning to obtain the first actual temperature of the first side of the battery cell and the second actual temperature of the second side of the battery cell; the control method of the second cooling module includes: when the second actual temperature is greater than or equal to the third temperature threshold, comparing the second actual temperature with a pre-stored fourth temperature threshold; when the second actual temperature is greater than or equal to the fourth temperature threshold, controlling the second cooling module to be in the first state; returning to obtain the first actual temperature of the first side of the battery cell and the second actual temperature of the second side of the battery cell.

[0008] Optionally, the control method of the first cooling module includes: when the first actual temperature is less than the second temperature threshold, controlling the first cooling module to be in the second state; returning to obtain the first actual temperature of the first side of the battery cell and the second actual temperature of the second side of the battery cell; the control method of the second cooling module includes: when the second actual temperature is less than the fourth temperature threshold, controlling the second cooling module to be in the second state; returning to obtain the first actual temperature of the first side of the battery cell and the second actual temperature of the second side of the battery cell.

[0009] Optionally, the second temperature threshold of the first cooling module is equal to the fourth temperature threshold of the second cooling module.

[0010] Optionally, the control method of the first cooling module includes: when the difference between the first actual temperature and the second actual temperature is less than or equal to the first temperature difference threshold, comparing the difference between the first actual temperature and the second actual temperature with a pre-stored second temperature difference threshold; when the difference between the first actual temperature and the second actual temperature is greater than or equal to the second temperature difference threshold, controlling the first cooling module to be in the second state; returning to obtain the first actual temperature of the first side of the battery cell and the second actual temperature of the second side of the battery cell; the control method of the second cooling module includes: when the difference between the second actual temperature and the first actual temperature is less than or equal to the third temperature difference threshold, comparing the difference between the second actual temperature and the first actual temperature with a pre-stored fourth temperature difference threshold; when the difference between the second actual temperature and the first actual temperature is greater than or equal to the fourth temperature difference threshold, controlling the second cooling module to be in the second state; returning to obtain the first actual temperature of the first side of the battery cell and the second actual temperature of the second side of the battery cell.

[0011] Optionally, the control method of the first cooling module includes: when the difference between the first actual temperature and the second actual temperature is less than the second temperature difference threshold, comparing the difference between the first actual temperature and the second actual temperature with 0; when the difference between the first actual temperature and the second actual temperature is greater than 0, returning to compare the difference between the first actual temperature and the second actual temperature with the pre-stored first temperature difference threshold; the control method of the second cooling module includes: when the difference between the second actual temperature and the first actual temperature is less than the fourth temperature difference threshold, comparing the difference between the second actual temperature and the first actual temperature with 0; when the difference between the second actual temperature and the first actual temperature is greater than 0, returning to compare the difference between the second actual temperature and the first actual temperature with the pre-stored third temperature difference threshold.

[0012] Optionally, the control method of the first cooling module includes: when the difference between the first actual temperature and the second actual temperature is less than or equal to 0, sending an interrupt signal to the second cooling module; wherein the interrupt signal includes: returning to compare the difference between the second actual temperature and the first actual temperature with a pre-stored third temperature difference threshold; returning to obtain the first actual temperature of the first side of the battery cell and the second actual temperature of the second side of the battery cell; the control method of the second cooling module includes: when the difference between the second actual temperature and the first actual temperature is less than or equal to 0, sending an interrupt signal to the first cooling module; wherein the interrupt signal includes: returning to compare the difference between the first actual temperature and the second actual temperature with the pre-stored first temperature difference threshold; returning to obtain the first actual temperature of the first side of the battery cell and the second actual temperature of the second side of the battery cell.

[0013] Optionally, the second temperature difference threshold of the first cooling module is equal to the fourth temperature difference threshold of the second cooling module.

[0014] Optionally, the first temperature threshold of the first cooling module is equal to the third temperature threshold of the second cooling module; and / or the first temperature difference threshold of the first cooling module is equal to the third temperature difference threshold of the second cooling module.

[0015] The present invention also provides a battery cell cooling system, which includes a first cooling module and a second cooling module. The first cooling module is used to cool the first side of the battery cell, and the second cooling module is used to cool the second side of the battery cell opposite to the first side. The first cooling module and the second cooling module both have a first state in which the cooling medium flows and refrigerates, and a second state in which the cooling medium flows and does not refrigerate. The control methods of the first cooling module and the second cooling module both implement the control method provided by the present invention.

[0016] The present invention has the following beneficial effects:

[0017] The present invention provides a control method for a battery cell cooling system, in which a first cooling module and a second cooling module are respectively provided on the first and second sides of the battery cell, to respectively obtain a first actual temperature on the first side of the battery cell and a second actual temperature on the second side of the battery cell. Thus, when the temperature difference between the two sides of the battery cell exceeds a predetermined value, the cooling medium of the cooling module located on the side with the higher temperature is controlled to flow and cool, thereby reducing the temperature difference between the two sides of the battery cell and improving the battery cell performance. The present invention not only reduces the temperature difference between the opposite sides of the battery cell and improves the battery cell performance, but also the control methods executed by the first cooling module and the second cooling module are independent of each other, which can improve the safety of the battery cell cooling system.

[0018] Other objects and features of the present invention will become clear by reading the specification, claims and drawings of this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments with reference to the following drawings, in which:

[0020] FIG1 is a control method of a first cooling module according to an embodiment of the present invention;

[0021] FIG2 is a control method of the second cooling module according to an embodiment of the present invention;

[0022] FIG3 is a control method of the first cooling module according to another embodiment of the present invention;

[0023] FIG4 is a control method of the second cooling module according to another embodiment of the present invention;

[0024] FIG5 is a control method of the first cooling module according to another embodiment of the present invention;

[0025] FIG6 is a control method of the second cooling module according to another embodiment of the present invention;

[0026] 7 is a schematic diagram of the relative positional relationship between the first cooling module and the second cooling module and the battery cell in one direction according to an embodiment of the present invention;

[0027] 8 is a schematic diagram of the relative positional relationship between the first cooling module, the second cooling module, and the battery cells according to another embodiment of the present invention;

[0028] Description of reference numerals:

[0029] 100, battery cell; 110, first side; 120, second side;

[0030] 200, first cooling pipe; 210, first inlet; 220, first outlet;

[0031] 300, second cooling pipe; 310, second inlet; 320, second outlet. DETAILED DESCRIPTION

[0032] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and are not to be construed as limiting the present invention.

[0033] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more of the specified features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0034] The invention below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the present invention, the components and settings of specific examples are described below. Of course, these are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0035] Throughout this specification, reference to terms such as "one embodiment," "certain embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with an embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative descriptions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0036] The battery cell cooling system of this embodiment includes a first cooling module and a second cooling module. The battery cell has a first side and a second side disposed opposite each other. The first cooling module is used to cool the first side of the battery cell, and the second cooling module is used to cool the second side of the battery cell. In one embodiment, the first cooling module is located on the first side of the battery cell, and the second cooling module is located on the second side of the battery cell. For example, the first cooling module is located above the battery cell to cool the upper portion of the battery cell, while the second cooling module is located below the battery cell to cool the lower portion of the battery cell. Since the first cooling module is located on the first side of the battery cell, the first side of the battery cell and the first cooling module are on the same side, while the second side of the battery cell and the first side are on different sides. Similarly, since the second cooling module is located on the second side of the battery cell, the second side of the battery cell and the second cooling module are on the same side, while the first side of the battery cell and the second cooling module are on different sides. The first cooling module has a first state in which the cooling medium flows and the battery cell is cooled, and a second state in which the cooling medium flows and the battery cell is not cooled. The second cooling module has a first state in which the cooling medium flows and the battery cell is cooled, and a second state in which the cooling medium flows and the battery cell is not cooled.

[0037] The control method of the first cooling module includes:

[0038] Acquire a first actual temperature of a first side of the battery cell and a second actual temperature of a second side of the battery cell;

[0039] When the first actual temperature is less than a pre-stored first temperature threshold, comparing the difference between the first actual temperature and the second actual temperature with the pre-stored first temperature difference threshold;

[0040] When the difference between the first actual temperature and the second actual temperature is greater than a first temperature difference threshold, controlling the first cooling module to be in a first state;

[0041] Returns the first actual temperature of the first side of the battery cell and the second actual temperature of the second side of the battery cell.

[0042] The control method of the second cooling module includes:

[0043] Acquire a first actual temperature of a first side of the battery cell and a second actual temperature of a second side of the battery cell;

[0044] When the second actual temperature is less than a pre-stored third temperature threshold, comparing the difference between the second actual temperature and the first actual temperature with the pre-stored third temperature difference threshold;

[0045] When the difference between the second actual temperature and the first actual temperature is greater than a third temperature difference threshold, controlling the second cooling module to be in the first state;

[0046] Returns the first actual temperature of the first side of the battery cell and the second actual temperature of the second side of the battery cell

[0047] The control methods of the first cooling module and the second cooling module are independent of each other.

[0048] In the control method of the battery cell cooling system of this embodiment, a first cooling module and a second cooling module are respectively provided on the first side and the second side of the battery cell to respectively obtain a first actual temperature on the first side of the battery cell and a second actual temperature on the second side of the battery cell. Therefore, when the temperature difference between the two sides of the battery cell exceeds a predetermined value, the cooling medium of the cooling module located on the side with the higher temperature is controlled to flow and cool, thereby reducing the temperature difference between the two sides of the battery cell and improving the battery cell performance. This embodiment of the present invention not only reduces the temperature difference between the two opposite sides of the battery cell and improves the battery cell performance, but also the control methods executed by the first cooling module and the second cooling module are independent of each other, which can improve the safety of the battery cell cooling system.

[0049] It should be noted that when the first cooling module is in the first state, the cooling medium flows through the first side of the battery cell and cools the first side of the battery cell. At this time, the temperature change on the first side of the battery cell depends on the "temperature difference + flow" of the cooling medium. When the first cooling module is in the second state, the cooling medium flows through the first side of the battery cell but does not cool the first side of the battery cell. At this time, the temperature change on the first side of the battery cell depends on the "flow" of the cooling medium. Specifically, the first cooling module includes a first cooling source for providing a cooling medium and a first cooling pipe laid on the first side of the battery cell. If the first cooling source is a refrigerator, the first cooling module in the first state can be understood as the refrigerator being in the on state and providing flowing cooling medium to the first cooling pipe. The first cooling module in the second state can be understood as the refrigerator being in the off state and providing flowing cooling medium to the first cooling pipe.

[0050] Similarly, when the second cooling module is in the first state, the cooling medium flows through the second side of the battery cell and cools the second side of the battery cell. At this time, the temperature change on the second side of the battery cell depends on the "temperature difference + flow" of the cooling medium. When the second cooling module is in the second state, the cooling medium flows through the second side of the battery cell but does not cool the second side of the battery cell. At this time, the temperature change on the second side of the battery cell depends on the "flow" of the cooling medium. Specifically, the second cooling module includes a second cooling source for providing a cooling medium and a second cooling pipe laid on the second side of the battery cell. If the second cooling source is a refrigerator, the second cooling module in the first state can be understood as the refrigerator being in the on state and providing flowing cooling medium to the second cooling pipe. The second cooling module in the second state can be understood as the refrigerator being in the off state and providing flowing cooling medium to the second cooling pipe.

[0051] The control method of the first cooling module and the second cooling module in this embodiment is described below with two examples.

[0052] Example 1 (first cooling module)

[0053] Figure 1 is a control method for a first cooling module according to an embodiment of the present invention. Referring to Figure 1 , the control method for a first cooling module includes steps S1001 to S1005.

[0054] Step S1001: controlling the first cooling module to be in an idle state.

[0055] Step S1002: obtaining the temperature T1 of the first side of the battery cell and the temperature T2 of the second side of the battery cell.

[0056] Step S1003: Determine whether the temperature T1 is less than the temperature threshold A1.

[0057] Step S1004: If the judgment result of step S1003 is "yes (ie, Y in FIG1 )", it is determined whether the difference between the temperature T1 and the temperature T2 (ie, T1 - T2) is greater than the temperature difference threshold ΔA1.

[0058] Step S1005: If the judgment result of step S1004 is "yes", the first cooling module is controlled to be in the first state.

[0059] Then, return to step S1002.

[0060] It should be noted that the idle state in step S1001 can be understood as the cooling medium of the first cooling module neither flowing nor cooling. In other words, the refrigerator is in a closed state and does not provide flowing cooling medium to the first cooling pipe.

[0061] Example 2 (Second Cooling Module)

[0062] FIG2 is a control method for the second cooling module according to an embodiment of the present invention. Referring to FIG2 , the control method for the second cooling module includes steps S2001 to S2005.

[0063] Step S2001: Control the second cooling module to be in an idle state.

[0064] Step S2002: obtaining the temperature T1 of the first side of the battery cell and the temperature T2 of the second side of the battery cell.

[0065] Step S2003: Determine whether the temperature T2 is less than the temperature threshold B1.

[0066] Step S2004: If the determination result of step S2003 is “yes”, it is determined whether the difference between the temperature T2 and the temperature T1 (ie, T2 − T1 ) is greater than the temperature difference threshold ΔB1 .

[0067] Step S2005: If the judgment result of step S2004 is yes, the second cooling module is controlled to be in the first state.

[0068] Then, return to step S2002.

[0069] It should be noted that the idle state in step S2001 can be understood as the cooling medium of the second cooling module neither flowing nor cooling. In other words, the refrigerator is in a closed state and does not provide flowing cooling medium to the second cooling pipe.

[0070] In the above two embodiments, the first temperature threshold of the first cooling module is equal to the third temperature threshold of the second cooling module. Of course, temperature threshold A1 and temperature threshold B1 can be equal or unequal. Preferably, temperature threshold A1 and temperature threshold B1 are equal, for example, they can both be 10°C, 20°C, or 30°C. Specific values ​​can be set according to different situations and are not given here.

[0071] In the two aforementioned embodiments, the first temperature difference threshold of the first cooling module is equal to the third temperature difference threshold of the second cooling module. Of course, the temperature difference threshold ΔA1 and the temperature difference threshold ΔB1 can be equal or unequal. Preferably, the temperature difference threshold ΔA1 and the temperature difference threshold B1 are equal, for example, both 3°C, 4°C, 5°C, or 6°C. Specific values ​​can be set according to different circumstances and are not given here.

[0072] In one embodiment, the control method of the first cooling module includes:

[0073] When the first actual temperature is greater than or equal to the first temperature threshold, comparing the first actual temperature with a pre-stored second temperature threshold;

[0074] When the first actual temperature is greater than or equal to a second temperature threshold, controlling the first cooling module to be in a first state;

[0075] Returns the first actual temperature of the first side of the battery cell and the second actual temperature of the second side of the battery cell.

[0076] The control method of the second cooling module includes:

[0077] When the second actual temperature is greater than or equal to the third temperature threshold, comparing the second actual temperature with a pre-stored fourth temperature threshold;

[0078] When the second actual temperature is greater than or equal to a fourth temperature threshold, controlling the second cooling module to be in the first state;

[0079] Returns the first actual temperature of the first side of the battery cell and the second actual temperature of the second side of the battery cell.

[0080] The battery cell cooling system control method in this embodiment not only controls the cooling module on the hotter side of the battery cell to cool the hotter side when the temperature difference between the two opposite sides is too large, thereby reducing the temperature difference across the battery cell; it also controls the cooling module on the hotter side to cool the hotter side when the temperature on one side of the battery cell is high, thereby ensuring the safety of the battery cell on one side. By controlling the temperature in both directions, both the temperature and the temperature difference can be reduced, while simultaneously reducing the temperature difference between the upper and lower parts of the battery cell, achieving true temperature uniformity and improving battery cell and system performance.

[0081] In one embodiment, the control method of the first cooling module includes:

[0082] When the first actual temperature is less than a second temperature threshold, controlling the first cooling module to be in a second state;

[0083] Returns the first actual temperature of the first side of the battery cell and the second actual temperature of the second side of the battery cell.

[0084] The control method of the second cooling module includes:

[0085] When the second actual temperature is less than a fourth temperature threshold, controlling the second cooling module to be in a second state;

[0086] Returns the first actual temperature of the first side of the battery cell and the second actual temperature of the second side of the battery cell.

[0087] The battery cell cooling system control method in this embodiment controls the first cooling module to be in the second state when the first actual temperature is greater than or equal to the first temperature threshold and less than the second temperature threshold; and controls the second cooling module to be in the second state when the second actual temperature is greater than or equal to the third temperature threshold and less than the fourth temperature threshold.

[0088] In one embodiment, the control method of the first cooling module includes:

[0089] When the difference between the first actual temperature and the second actual temperature is less than or equal to the first temperature difference threshold, comparing the difference between the first actual temperature and the second actual temperature with a pre-stored second temperature difference threshold;

[0090] When the difference between the first actual temperature and the second actual temperature is greater than or equal to a second temperature difference threshold, controlling the first cooling module to be in a second state;

[0091] Returns the first actual temperature of the first side of the battery cell and the second actual temperature of the second side of the battery cell.

[0092] The control method of the second cooling module includes:

[0093] When the difference between the second actual temperature and the first actual temperature is less than or equal to the third temperature difference threshold, comparing the difference between the second actual temperature and the first actual temperature with a pre-stored fourth temperature difference threshold;

[0094] When the difference between the second actual temperature and the first actual temperature is greater than or equal to a fourth temperature difference threshold, controlling the second cooling module to be in a second state;

[0095] Returns the first actual temperature of the first side of the battery cell and the second actual temperature of the second side of the battery cell.

[0096] The battery cell cooling system control method in this embodiment controls the first cooling module to be in the second state when the difference between the first actual temperature and the second actual temperature is greater than or equal to the second temperature difference threshold and less than or equal to the first temperature difference threshold; and controls the second cooling module to be in the second state when the difference between the second actual temperature and the first actual temperature is greater than or equal to the fourth temperature difference threshold and less than or equal to the third temperature difference threshold.

[0097] In one embodiment, the control method of the first cooling module includes:

[0098] When the difference between the first actual temperature and the second actual temperature is less than a second temperature difference threshold, comparing the difference between the first actual temperature and the second actual temperature with 0;

[0099] When the difference between the first actual temperature and the second actual temperature is greater than 0, the method returns to compare the difference between the first actual temperature and the second actual temperature with a pre-stored first temperature difference threshold.

[0100] The control method of the second cooling module includes:

[0101] When the difference between the second actual temperature and the first actual temperature is less than a fourth temperature difference threshold, comparing the difference between the second actual temperature and the first actual temperature with 0;

[0102] When the difference between the second actual temperature and the first actual temperature is greater than 0, the method returns to compare the difference between the second actual temperature and the first actual temperature with a pre-stored third temperature difference threshold.

[0103] In one embodiment, the control method of the first cooling module includes:

[0104] When the difference between the first actual temperature and the second actual temperature is less than or equal to 0, an interrupt signal is sent to the second cooling module; wherein the interrupt signal includes: returning to compare the difference between the second actual temperature and the first actual temperature with a pre-stored third temperature difference threshold;

[0105] Returns the first actual temperature of the first side of the battery cell and the second actual temperature of the second side of the battery cell.

[0106] The control method of the second cooling module includes:

[0107] When the difference between the second actual temperature and the first actual temperature is less than or equal to 0, an interrupt signal is sent to the first cooling module; wherein the interrupt signal includes: returning to compare the difference between the first actual temperature and the second actual temperature with a pre-stored first temperature difference threshold;

[0108] Returns the first actual temperature of the first side of the battery cell and the second actual temperature of the second side of the battery cell.

[0109] In the battery cell cooling system control method of this embodiment, when the difference between the first actual temperature and the second actual temperature is less than or equal to 0, an interrupt signal is sent to another cooling module to request the other cooling module to perform corresponding steps.

[0110] The following uses two embodiments to illustrate the control methods of the first cooling module and the second cooling module of the battery cell cooling system.

[0111] Example 1 (first cooling module)

[0112] FIG3 is a control method for a first cooling module according to another embodiment of the present invention. Referring to FIG3 , the control method for a first cooling module includes steps S3001 to S3010.

[0113] Step S3001: Control the first cooling module to be in an idle state.

[0114] Step S3002: obtaining the temperature T1 of the first side of the battery cell and the temperature T2 of the second side of the battery cell.

[0115] Step S3003: Determine whether the temperature T1 is greater than or equal to the temperature threshold A1.

[0116] In step S3003, if the judgment result of step S3003 is "yes", then determine whether the temperature T1 is greater than or equal to the temperature threshold A2, specifically step S3004; if the judgment result of step S3003 is "no", then determine whether the difference between temperature T1 and temperature T2 is less than or equal to the temperature difference threshold △A1, specifically step S3005.

[0117] Step S3004: Determine whether temperature T1 is greater than or equal to temperature threshold A2. If the determination result of step S3004 is "yes," the first cooling module is controlled to be in the first state, specifically step S3006. If the determination result of step S3004 is "no," the first cooling module is controlled to be in the second state, specifically step S3008.

[0118] Step S3005: Determine whether the difference between the temperature T1 and the temperature T2 is less than or equal to the temperature difference threshold ΔA1.

[0119] In step S3005, if the judgment result of step S3005 is "no", the first cooling module is controlled to be in the first state, specifically step S3006; if the judgment result of step S3005 is "yes", then it is determined whether the difference between temperature T1 and temperature T2 is greater than or equal to the temperature difference threshold △A2, specifically step S3007.

[0120] Step S3006: Control the first cooling module to be in the first state.

[0121] Step S3007: Determine whether the difference between the temperature T1 and the temperature T2 is greater than or equal to the temperature difference threshold ΔA2.

[0122] In step S3007, if the judgment result of step S3007 is "yes", the first cooling module is controlled to be in the second state, specifically step S3008; if the judgment result of step S3007 is "no", it is determined whether the difference between temperature T1 and temperature T2 is greater than 0, specifically step S3009.

[0123] Step S3008: Control the first cooling module to be in the second state.

[0124] Step S3009: Determine whether the difference between temperature T1 and temperature T2 is greater than 0.

[0125] In step S3009, if the judgment result of step S3009 is "yes", then determine whether the difference between temperature T1 and temperature T2 is less than or equal to the temperature difference threshold △A1, specifically step S3005; if the judgment result of step S3009 is "no", then send an interrupt signal to the second cooling module, specifically control the second cooling module to execute step S4005.

[0126] In the control method of the first cooling module in this embodiment, when the temperature of the first side of the battery cell T1 ≥ A2, the first cooling module is controlled to be in the first state; when the temperature of the first side of the battery cell A1 ≤ T1 < A2, the first cooling module is controlled to be in the second state; when the temperature of the first side of the battery cell T1 < A1, and △A2 ≤ T1-T2 ≤ △A1, the first cooling module is controlled to be in the second state; when the temperature of the first side of the battery cell T1 < A1, and 0 < T1-T2 < △A2, the first cooling module is controlled to be in an idle state; when the temperature of the first side of the battery cell T1 < A1, and T1-T2 ≤ 0, an interrupt signal is sent to the second cooling module; when the temperature of the first side of the battery cell T1 < A1, and T1-T2 > △A1, the first cooling module is controlled to be in the first state.

[0127] Therefore, in this embodiment, the trigger conditions for cooling the first side of the battery cell include: 1) the temperature of the first side of the battery cell T1 ≥ A2; 2) T1-T2> ΔA1. In other words, when the temperature of the first side of the battery cell is too high, or the temperature of the first side of the battery cell is much higher than the temperature of the second side of the battery cell, the first side of the battery cell is cooled.

[0128] Example 2 (Second Cooling Module)

[0129] Figure 4 is a control method for the second cooling module according to another embodiment of the present invention. Referring to Figure 4 , the control method for the second cooling module includes steps S4001 to S4010.

[0130] Step S4001: Control the second cooling module to be in an idle state.

[0131] Step S4002: obtaining the temperature T1 of the first side of the battery cell and the temperature T2 of the second side of the battery cell.

[0132] Step S4003: Determine whether the temperature T2 is greater than or equal to the temperature threshold B1.

[0133] In step S4003, if the judgment result of step S4003 is "yes", then it is determined whether the temperature T2 is greater than or equal to the temperature threshold B2, specifically step S4004; if the judgment result of step S4003 is "no", then it is determined whether the difference between the temperature T2 and the temperature T1 is less than or equal to the temperature difference threshold ΔB1, specifically step S4005.

[0134] Step S4004: Determine whether the temperature T2 is greater than or equal to the temperature threshold B2.

[0135] In step S4004, if the judgment result of step S4004 is "yes", the second cooling module is controlled to be in the first state, specifically step S4006; if the judgment result of step S4004 is "no", the second cooling module is controlled to be in the second state, specifically step S4008.

[0136] Step S4005: Determine whether the difference between the temperature T2 and the temperature T1 is less than or equal to the temperature difference threshold ΔB1.

[0137] In step S4005, if the judgment result of step S4005 is "no", the second cooling module is controlled to be in the first state, specifically step S4006; if the judgment result of step S4005 is "yes", it is determined whether the difference between temperature T2 and temperature T1 is greater than or equal to the temperature difference threshold △B2, specifically step S4007.

[0138] Step S4006: Control the second cooling module to be in the first state.

[0139] Step S4007: Determine whether the difference between the temperature T2 and the temperature T1 is greater than or equal to the temperature difference threshold ΔB2.

[0140] In step S4007, if the judgment result of step S4007 is "yes", the second cooling module is controlled to be in the second state, specifically step S4008; if the judgment result of step S4007 is "no", it is determined whether the difference between temperature T2 and temperature T1 is greater than 0, specifically step S4009.

[0141] Step S4008: Control the second cooling module to be in the second state.

[0142] Step S4009: Determine whether the difference between temperature T2 and temperature T1 is greater than 0.

[0143] In step S4009, if the judgment result of step S4009 is "yes", then determine whether the difference between temperature T2 and temperature T1 is less than or equal to the temperature difference threshold △B1, specifically step S4005; if the judgment result of step S4009 is "no", then send an interrupt signal to the first cooling module, specifically control the first cooling module to execute step S3005.

[0144] In the above two embodiments, the second temperature threshold of the first cooling module is equal to the fourth temperature threshold of the second cooling module. In other words, temperature threshold A2 and temperature threshold B2 can be equal or unequal. Preferably, temperature threshold A2 and temperature threshold B2 are equal, for example, both are 35°C, 45°C, or 45°C.

[0145] In the above two embodiments, the second temperature difference threshold of the first cooling module is equal to the fourth temperature difference threshold of the second cooling module. In other words, the temperature difference threshold ΔA2 and the temperature difference threshold ΔB2 can be equal or unequal. Preferably, the temperature difference threshold ΔA2 and the temperature difference threshold B2 are equal, for example, both are 0.1°C, 0.5°C, or 1°C.

[0146] In the control method of the second cooling module in this embodiment, when the temperature T2 on the second side of the battery cell is ≥ B2, the second cooling module is controlled to be in the first state; when the temperature B1 ≤ T2 < B2 on the second side of the battery cell, the second cooling module is controlled to be in the second state; when the temperature T2 on the second side of the battery cell is < B1, and △B2 ≤ T2-T1 ≤ △B1, the second cooling module is controlled to be in the second state; when the temperature T2 on the second side of the battery cell is < B1, and 0 < T2-T1 < △B2, the second cooling module is controlled to be in an idle state; when the temperature T2 on the second side of the battery cell is < B1, and T2-T1 ≤ 0, an interrupt signal is sent to the first cooling module; when the temperature T2 on the second side of the battery cell is < B1, and T2-T1 > △B1, the second cooling module is controlled to be in the first state.

[0147] Therefore, in this embodiment, the trigger conditions for cooling the second side of the battery cell include: 1) the temperature of the second side of the battery cell T2 ≥ B2; 2) T2 - T1 > ΔB1. In other words, when the temperature of the second side of the battery cell is too high, or the temperature of the second side of the battery cell is much higher than the temperature of the first side of the battery cell, the second side of the battery cell is cooled.

[0148] In addition to the above two embodiments, the present invention also provides two other embodiments for illustration.

[0149] Example 1 (first cooling module)

[0150] FIG5 is a control method for the first cooling module according to another embodiment of the present invention. Referring to FIG5 , the control method for the first cooling module includes steps S5001 to S5010.

[0151] Step S5001: Control the first cooling module to be in an idle state.

[0152] Step S5002: obtaining the temperature T1 of the first side of the battery cell and the temperature T2 of the second side of the battery cell.

[0153] Step S5003: Determine whether the temperature T1 is greater than or equal to the temperature threshold A1.

[0154] In step S5003, if the judgment result of step S5003 is "yes", the first cooling module is controlled to be in the second state, specifically step S5004; if the judgment result of step S5003 is "no", then it is determined whether the difference between temperature T1 and temperature T2 is greater than or equal to the temperature difference threshold △A2, and less than or equal to the temperature difference threshold △A1, specifically step S5005.

[0155] Step S5004: Control the first cooling module to be in the second state.

[0156] Step S5006: Determine whether the temperature T1 is greater than or equal to the temperature threshold A2.

[0157] In step S5006, if the judgment result of step S5006 is "yes", the first cooling module is controlled to be in the first state, specifically step S5008; if the judgment result of step S5006 is "no", it is determined whether the temperature T1 is greater than or equal to the temperature threshold A1, specifically step S5003.

[0158] Step S5005: Determine whether the difference between the temperature T1 and the temperature T2 is greater than or equal to the temperature difference threshold ΔA2 and less than or equal to the temperature difference threshold ΔA1.

[0159] In step S5005, if the judgment result of step S5005 is "yes", the first cooling module is controlled to be in the second state, specifically step S5004; if the judgment result of step S5005 is "no", it is determined whether the difference between temperature T1 and temperature T2 is less than the temperature difference threshold △A2, specifically step S5007.

[0160] Step S5007: Determine whether the difference between the temperature T1 and the temperature T2 is less than the temperature difference threshold ΔA2.

[0161] In step S5007, if the judgment result of step S5007 is "no", the first cooling module is controlled to be in the first state, specifically step S5008; if the judgment result of step S5007 is "yes", it is determined whether the difference between temperature T1 and temperature T2 is greater than 0, specifically step S5009.

[0162] Step S5008: Control the first cooling module to be in the first state.

[0163] Step S5009: Determine whether the difference between temperature T1 and temperature T2 is greater than 0.

[0164] In step S5009, if the judgment result of step S5009 is "yes", then return to judge whether the difference between temperature T1 and temperature T2 is greater than or equal to the temperature difference threshold △A2, and less than or equal to the temperature difference threshold △A1, and specifically return to step S5005; if the judgment result of step S5007 is "no", then send an interrupt signal to the second cooling module, and specifically control the second cooling module to execute step S6005.

[0165] Example 2 (Second Cooling Module)

[0166] FIG6 is a control method for the second cooling module according to another embodiment of the present invention. Referring to FIG6 , the control method for the second cooling module includes steps S6001 to S6010.

[0167] Step S6001: Control the second cooling module to be in an idle state.

[0168] Step S6002: obtaining the temperature T1 of the first side of the battery cell and the temperature T2 of the second side of the battery cell.

[0169] Step S6003: Determine whether the temperature T2 is greater than or equal to the temperature threshold B1.

[0170] In step S6003, if the judgment result of step S6003 is "yes", the second cooling module is controlled to be in the second state, specifically step S6004; if the judgment result of step S6003 is "no", then it is determined whether the difference between temperature T2 and temperature T1 is greater than or equal to the temperature difference threshold △B2, and less than or equal to the temperature difference threshold △B1, specifically step S6005.

[0171] Step 6S004: Control the second cooling module to be in the second state.

[0172] Step S6006: Determine whether the temperature T2 is greater than or equal to the temperature threshold B2.

[0173] In step S6006, if the judgment result of step S6006 is "yes", the second cooling module is controlled to be in the first state, specifically step S6008; if the judgment result of step S6006 is "no", it is determined whether the temperature T2 is greater than or equal to the temperature threshold B1, specifically step S6003.

[0174] Step S6005: Determine whether the difference between the temperature T2 and the temperature T1 is greater than or equal to the temperature difference threshold ΔB2 and less than or equal to the temperature difference threshold ΔB1.

[0175] In step S6005, if the judgment result of step S6005 is "yes", the second cooling module is controlled to be in the second state, specifically step S6004; if the judgment result of step S6005 is "no", it is determined whether the difference between temperature T2 and temperature T1 is less than the temperature difference threshold △B2, specifically step S6007.

[0176] Step S6007: Determine whether the difference between the temperature T2 and the temperature T1 is less than the temperature difference threshold ΔB2.

[0177] In step S6007, if the judgment result of step S6007 is "no", the second cooling module is controlled to be in the first state, specifically step S6008; if the judgment result of step S6007 is "yes", it is determined whether the difference between temperature T2 and temperature T1 is greater than 0, specifically step S6009.

[0178] Step S6008: Control the second cooling module to be in the first state.

[0179] Step S6009: Determine whether the difference between temperature T2 and temperature T1 is greater than 0.

[0180] In step S6009, if the judgment result of step S6009 is "yes", then return to judge whether the difference between temperature T2 and temperature T1 is greater than or equal to the temperature difference threshold △B2, and less than or equal to the temperature difference threshold △B1, and specifically return to step S6005; if the judgment result of step S6009 is "no", then send an interrupt signal to the first cooling module, and specifically control the first cooling module to execute step S5005.

[0181] The battery cell cooling system of this embodiment includes a first cooling module and a second cooling module. The first cooling module is used to cool the first side of the battery cell, and the second cooling module is used to cool the second side of the battery cell opposite the first side. The first cooling module has a first state in which the cooling medium flows and refrigeration is performed, and a second state in which the cooling medium flows and refrigeration is not performed. The second cooling module has a first state in which the cooling medium flows and refrigeration is performed, and a second state in which the cooling medium flows and refrigeration is not performed. The control methods of the first cooling module and the second cooling module both implement the control methods of the above-mentioned embodiment.

[0182] Figure 7 is a schematic diagram of the relative positional relationship between the first cooling module and the second cooling module and the battery cell in one direction of an embodiment of the present invention. Figure 8 is a schematic diagram of the relative positional relationship between the first cooling module and the second cooling module and the battery cell in another direction of an embodiment of the present invention. Referring to Figures 7 and 8, the first cooling module located on the first side 110 of the battery cell 100 includes a first cooling source for providing a cooling medium and a first cooling pipe 200 laid on the first side 110 of the battery cell. The first cooling pipe 200 includes a first inlet 210 and a first outlet 220, and the cooling medium flows from the first inlet 210 to the first outlet 220. In one embodiment, the first cooling pipe 200 includes a plurality of first outlets 220. The plurality of first outlets 220 can be converged together and flow back to the first cooling source, or can flow back to the first cooling source separately.

[0183] Referring to Figures 7 and 8 , the second cooling module located on the second side 120 of the battery cell 100 includes a second cooling source for providing a cooling medium and a second cooling pipe 300 laid on the second side 120 of the battery cell. The second cooling pipe 300 includes a second inlet 310 and a second outlet 320, through which the cooling medium flows. In one embodiment, the second cooling pipe 300 includes multiple second outlets 320. The cooling medium from the multiple second outlets 320 can be combined and returned to the second cooling source, or can be returned to the second cooling source separately.

[0184] The first cooling source and the second cooling source can be the same cooling source or different cooling sources. The first cooling pipe 200 and the second cooling pipe 300 are symmetrically arranged.

[0185] In one embodiment, the battery cell cooling system includes multiple battery cells 100, and the first cooling pipe 200 located on the first side 110 of the battery cell 100 is arranged with multiple "J"-shaped bends to improve the cooling efficiency of each battery cell 100 and avoid temperature differences between the multiple battery cells 100.

[0186] The second cooling pipe 300 located on the second side 120 of the battery cell 100 is arranged in a plurality of "J"-shaped bends to improve the cooling efficiency of each battery cell 100, avoid temperature differences between multiple battery cells 100, and improve the temperature uniformity of the upper and lower battery cells in the module.

[0187] In one embodiment, the battery cell cooling system includes a plurality of battery cells 100 , and the first actual temperature and the second actual temperature are obtained as multiple point values, and the maximum value is taken to improve the safety of the battery cell 100 .

[0188] It will be understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present invention, and the present invention is not limited thereto. Those skilled in the art will appreciate that various modifications and improvements can be made without departing from the spirit and substance of the present invention, and such modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A control method for a battery core cooling system, characterized in that: The battery cell cooling system comprises a first cooling module and a second cooling module, wherein the first cooling module is used to cool a first side of the battery cell, and the second cooling module is used to cool a second side of the battery cell opposite to the first side; the first cooling module and the second cooling module both have a first state in which a cooling medium flows and refrigeration is performed, and a second state in which the cooling medium flows and no refrigeration is performed; The control method of the first cooling module includes: Acquire a first actual temperature of a first side of the battery cell and a second actual temperature of a second side of the battery cell; When the first actual temperature is less than a pre-stored first temperature threshold, comparing the difference between the first actual temperature and the second actual temperature with a pre-stored first temperature difference threshold; When the difference between the first actual temperature and the second actual temperature is greater than the first temperature difference threshold, controlling the first cooling module to be in the first state; Returning the step of obtaining the first actual temperature of the first side of the battery cell and the second actual temperature of the second side of the battery cell; The control method of the second cooling module includes: Acquire a first actual temperature of a first side of the battery cell and a second actual temperature of a second side of the battery cell; When the second actual temperature is less than a pre-stored third temperature threshold, comparing the difference between the second actual temperature and the first actual temperature with the pre-stored third temperature difference threshold; When the difference between the second actual temperature and the first actual temperature is greater than the third temperature difference threshold, controlling the second cooling module to be in the first state; Returning the step of obtaining the first actual temperature of the first side of the battery cell and the second actual temperature of the second side of the battery cell; The control methods executed by the first cooling module and the second cooling module are independent of each other. stand.

2. The control method according to claim 1, characterized in that: The control method of the first cooling module includes: When the first actual temperature is greater than or equal to the first temperature threshold, comparing the first actual temperature with a pre-stored second temperature threshold; When the first actual temperature is greater than or equal to the second temperature threshold, controlling the first cooling module to be in the first state; Returning the step of obtaining the first actual temperature of the first side of the battery cell and the second actual temperature of the second side of the battery cell; The control method of the second cooling module includes: When the second actual temperature is greater than or equal to the third temperature threshold, comparing the second actual temperature with a pre-stored fourth temperature threshold; When the second actual temperature is greater than or equal to the fourth temperature threshold, controlling the second cooling module to be in the first state; Returning the step of obtaining the first actual temperature of the first side of the battery cell and the second actual temperature of the second side of the battery cell.

3. The control method according to claim 2, characterized in that: The control method of the first cooling module includes: When the first actual temperature is less than the second temperature threshold, controlling the first cooling module to be in the second state; Returning the step of obtaining the first actual temperature of the first side of the battery cell and the second actual temperature of the second side of the battery cell; The control method of the second cooling module includes: When the second actual temperature is less than the fourth temperature threshold, the second cooling mode is controlled The block is in the second state; Returning the step of obtaining the first actual temperature of the first side of the battery cell and the second actual temperature of the second side of the battery cell.

4. The control method according to claim 2, characterized in that: The second temperature threshold of the first cooling module is equal to the fourth temperature threshold of the second cooling module.

5. The control method according to claim 1, characterized in that: The control method of the first cooling module includes: When the difference between the first actual temperature and the second actual temperature is less than or equal to the first temperature difference threshold, comparing the difference between the first actual temperature and the second actual temperature with a pre-stored second temperature difference threshold; When the difference between the first actual temperature and the second actual temperature is greater than or equal to the second temperature difference threshold, controlling the first cooling module to be in the second state; Returning the step of obtaining the first actual temperature of the first side of the battery cell and the second actual temperature of the second side of the battery cell; The control method of the second cooling module includes: When the difference between the second actual temperature and the first actual temperature is less than or equal to the third temperature difference threshold, comparing the difference between the second actual temperature and the first actual temperature with a pre-stored fourth temperature difference threshold; When the difference between the second actual temperature and the first actual temperature is greater than or equal to the fourth temperature difference threshold, controlling the second cooling module to be in the second state; Returning the step of obtaining the first actual temperature of the first side of the battery cell and the second actual temperature of the second side of the battery cell.

6. The control method according to claim 5, characterized in that: The control method of the first cooling module includes: When the difference between the first actual temperature and the second actual temperature is less than the second temperature difference threshold, comparing the difference between the first actual temperature and the second actual temperature with 0; When the difference between the first actual temperature and the second actual temperature is greater than 0, returning to the step of comparing the difference between the first actual temperature and the second actual temperature with a pre-stored first temperature difference threshold; The control method of the second cooling module includes: When the difference between the second actual temperature and the first actual temperature is less than the fourth temperature difference threshold, comparing the difference between the second actual temperature and the first actual temperature with 0; When the difference between the second actual temperature and the first actual temperature is greater than 0, the process returns to comparing the difference between the second actual temperature and the first actual temperature with a pre-stored third temperature difference threshold.

7. The control method according to claim 6, characterized in that: The control method of the first cooling module includes: When the difference between the first actual temperature and the second actual temperature is less than or equal to 0, an interrupt signal is sent to the second cooling module; wherein the interrupt signal includes: returning the step of comparing the difference between the second actual temperature and the first actual temperature with a pre-stored third temperature difference threshold; Returning the step of obtaining the first actual temperature of the first side of the battery cell and the second actual temperature of the second side of the battery cell; The control method of the second cooling module includes: When the difference between the second actual temperature and the first actual temperature is less than or equal to 0, an interrupt signal is sent to the first cooling module; wherein the interrupt signal includes: returning the step of comparing the difference between the first actual temperature and the second actual temperature with a pre-stored first temperature difference threshold; Returning the step of obtaining the first actual temperature of the first side of the battery cell and the second actual temperature of the second side of the battery cell.

8. The control method according to claim 5, characterized in that: The second temperature difference threshold of the first cooling module is equal to the fourth temperature difference threshold of the second cooling module.

9. The control method according to claim 1, characterized in that: The first temperature threshold of the first cooling module is equal to the third temperature threshold of the second cooling module; and / or The first temperature difference threshold of the first cooling module is equal to the third temperature difference threshold of the second cooling module.

10. A battery core cooling system, characterized in that: The battery cell cooling system includes a first cooling module and a second cooling module, the first cooling module is used to cool the first side of the battery cell, and the second cooling module is used to cool the second side of the battery cell opposite to the first side; the first cooling module and the second cooling module both have a first state in which the cooling medium flows and refrigeration and a second state in which the cooling medium flows and does not refrigerate; the control methods of the first cooling module and the second cooling module both implement the control method described in any one of claims 1 to 9.

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