Battery system, vehicle, and method for controlling battery system

Abstract

The invention provides a battery system, a vehicle and a control method of the battery system, and relates to the technical field of batteries. The battery system comprises a battery pack and a liquid cooling assembly, the liquid cooling assembly comprises a liquid cooling plate, a liquid inlet pipe, a liquid outlet pipe and a plurality of valves, the battery pack is connected with the liquid cooling plate, the liquid cooling plate is divided into a plurality of cooling parts, heat exchange runners are defined by the cooling parts, and the multiple heat exchange runners in the multiple cooling parts are in one-to-one correspondence with the multiple valves; one end of each heat exchange runner is connected with the liquid inlet pipe through a valve corresponding to the heat exchange runner, the other end of each heat exchange runner is connected with the liquid outlet pipe, and the multiple heat exchange runners are connected in parallel. And each heat exchange flow channel can select whether to circulate the cooling medium or not based on the heat exchange area in the battery pack corresponding to the heat exchange part where the heat exchange flow channel is located. Thus, temperature adjustment can be carried out on different heat exchange areas in the battery pack, so that the situation that the local temperature in the battery pack is too high or too low is avoided, and the use performance of the battery pack is guaranteed.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery system, a vehicle, and a control method for the battery system. Background Art

[0002] With the rapid development of electric vehicles and energy storage systems, thermal management technology of battery packs, as one of the core components, has received increasing attention.

[0003] In existing technology, battery packs are typically cooled or heated using liquid cooling plates. These plates are formed with cooling channels through which a cooling medium circulates to cool or heat the battery pack. However, due to the varying heat generation within different areas of the battery pack, the liquid cooling plate cannot independently regulate the temperature of each area. This can cause some areas to be overheated or underheated, impacting the battery pack's performance. Summary of the Invention

[0004] In view of this, the present application provides a battery system, a vehicle, and a control method for the battery system to solve the problem that the liquid cooling plate cannot independently adjust the temperature of different areas, which may cause the temperature of some areas to be too high or too low, affecting the performance of the battery pack.

[0005] According to a first aspect of the present application, a battery system is provided, comprising a battery pack and a liquid cooling assembly, wherein the liquid cooling assembly comprises a liquid cooling plate, a liquid inlet pipe, a liquid outlet pipe, and a plurality of valves, wherein the battery pack is connected to the liquid cooling plate, the liquid cooling plate is divided into a plurality of cooling sections, each of the cooling sections being surrounded by heat exchange channels, wherein the plurality of heat exchange channels in the plurality of cooling sections corresponds one-to-one to the plurality of valves;

[0006] One end of the heat exchange channel is connected to the liquid inlet pipe through the valve corresponding to the heat exchange channel, and the other end of the heat exchange channel is connected to the liquid outlet pipe. The multiple heat exchange channels are connected in parallel.

[0007] Preferably, each of the heat exchange channels is correspondingly provided with a three-way valve and a circulation pump, the three-way valve including a first connection port, a second connection port, and a third connection port, the third connection port being switchable between being connected to the first connection port and being connected to the second connection port, the first connection port being connected to the heat exchange channel, and the third connection port being connected to the liquid outlet pipe;

[0008] The cooling portion further includes an internal circulation channel, a first end of the internal circulation channel is connected to the valve, and a second end of the internal circulation channel is connected to the second connecting port.

[0009] Preferably, the battery system further includes a heating layer, the heating layer includes a plurality of heating parts, the heating parts correspond one-to-one to the plurality of cooling parts, and the heating parts are bonded to the corresponding cooling parts.

[0010] According to a second aspect of the present application, a vehicle is provided, comprising the above-mentioned battery system.

[0011] According to a third aspect of the present application, a method for controlling a battery system is provided. The method is used to control the battery system described above, wherein the heat exchange channel and the internal circulation channel in one cooling unit, the valve corresponding to the heat exchange channel, the three-way valve, and the circulation pump are defined as a heat exchange mechanism; the liquid cooling assembly includes multiple heat exchange mechanisms; the battery pack is divided into multiple heat exchange areas, each of which corresponds to the multiple heat exchange mechanisms, and the heat exchange areas are capable of exchanging heat with the heat exchange channels in the corresponding heat exchange mechanisms;

[0012] The control method of the battery system includes:

[0013] S1. Obtaining the operating temperature of the battery pack;

[0014] S2. Determine the operating temperature, control the liquid cooling component to be in a heating mode or a cooling mode, open the valve, and connect the third connection port to the first connection port;

[0015] S3, when the liquid cooling assembly is in cooling mode, the operating temperature of one of the heat exchange areas is lower than the average temperature of the other heat exchange areas, the temperature difference between the operating temperature of the heat exchange area and the average temperature of the other heat exchange areas is greater than or equal to a first temperature difference ΔT1, and the temperature difference lasts for more than a first predetermined time t1, controlling the valve in the heat exchange mechanism corresponding to the heat exchange area to close, switching the third connection port to communicate with the second connection port, and operating the circulation pump;

[0016] When the liquid cooling component is in the heating mode, the operating temperature of one of the heat exchange areas is higher than the average temperature of the other heat exchange areas, the temperature difference between the operating temperature of the heat exchange area and the average temperature of the other heat exchange areas is greater than or equal to the second temperature difference ΔT2, and the duration exceeds the second predetermined time t2, the valve in the heat exchange mechanism corresponding to the heat exchange area is controlled to close, the third connection port is switched to be connected to the second connection port, and the circulation pump is started.

[0017] Preferably, when the liquid cooling assembly is in the cooling mode, the control method of the battery system further includes:

[0018] S4. When the working time of the circulating pump reaches a third predetermined time t3, obtaining the operating temperature of the heat exchange area corresponding to the heat exchange mechanism where the circulating pump is located, and determining the operating temperature of the heat exchange area;

[0019] S5. When the operating temperature of the heat exchange area is lower than the average temperature of other heat exchange areas, control the circulation pump to stop working;

[0020] When the operating temperature of the heat exchange area is greater than or equal to the average temperature of other heat exchange areas, and the maintenance time exceeds the fourth predetermined time t4, the valve in the heat exchange mechanism corresponding to the heat exchange area is controlled to open, the third connection port is switched to be connected to the first connection port, and the circulation pump stops working.

[0021] Preferably, the control method of the battery system further includes:

[0022] S6, when the temperature difference between the operating temperature of the heat exchange region and the average temperature of other heat exchange regions is greater than or equal to the third temperature difference ΔT3 and is maintained for more than a fifth predetermined time t5, controlling the circulation pump in the heat exchange mechanism corresponding to the heat exchange region to operate;

[0023] S7, when the operating temperature of the heat exchange area is less than or equal to the average temperature of other heat exchange areas, and the maintenance time exceeds a sixth predetermined time t6, controlling the circulation pump in the heat exchange mechanism corresponding to the heat exchange area to stop working;

[0024] S8. When the operating temperature of the heat exchange area is lower than the stop temperature T' and the maintenance time exceeds a seventh predetermined time t7, the liquid cooling component is controlled to stop working.

[0025] Preferably, when the liquid cooling assembly is in a heating mode, the control method of the battery system further includes:

[0026] S4. When the working time of the circulation pump reaches an eighth predetermined time t8, obtaining the temperature of the heat exchange area corresponding to the heat exchange mechanism where the circulation pump is located, and determining the temperature of the heat exchange area;

[0027] S5. When the operating temperature of the heat exchange area is higher than the average temperature of other heat exchange areas, the circulating pump is controlled to stop working;

[0028] When the operating temperature of the heat exchange area is less than or equal to the average temperature of other heat exchange areas, and the maintenance time exceeds the ninth predetermined time t9, the valve in the heat exchange mechanism corresponding to the heat exchange area is controlled to open, the third connection port is switched to be connected to the first connection port, and the circulation pump stops working.

[0029] Preferably, the control method of the battery system further includes:

[0030] When the lowest temperature in the battery pack is lower than a first preset lowest temperature, controlling the plurality of heating units to operate;

[0031] When the lowest temperature in the battery pack is greater than a second preset lowest temperature, the plurality of heating units are controlled to stop working, and the second preset lowest temperature is greater than the first preset lowest temperature.

[0032] Preferably, the control method of the battery system further includes:

[0033] When the maximum temperature of one of the heat exchange areas is greater than a first preset maximum temperature, controlling the circulation pump in the heat exchange mechanism corresponding to the heat exchange area to operate, controlling the valves in the multiple heat exchange mechanisms to open, and connecting the third connection port to the first connection port;

[0034] When the maximum temperature of the heat exchange area is greater than a second preset maximum temperature, the circulation pumps in the plurality of heat exchange mechanisms are controlled to operate, and the second preset maximum temperature is greater than the first preset maximum temperature.

[0035] In the battery system of the present application, the battery system includes a battery pack and a liquid cooling assembly. The liquid cooling assembly includes a liquid cooling plate, a liquid inlet pipe, a liquid outlet pipe and multiple valves. The battery pack is connected to the liquid cooling plate. The liquid cooling plate is divided into multiple cooling parts. The cooling parts are surrounded by heat exchange channels. The multiple heat exchange channels in the multiple cooling parts correspond to the multiple valves one by one. One end of the heat exchange channel is connected to the liquid inlet pipe through the valve corresponding to the heat exchange channel, and the other end of the heat exchange channel is connected to the liquid outlet pipe. The multiple heat exchange channels are connected in parallel. Since each heat exchange channel is provided with a corresponding valve, each heat exchange channel can choose whether to circulate the cooling medium based on the heat exchange area in the battery pack corresponding to the heat exchange part in which it is located. In this way, the temperature of different heat exchange areas in the battery pack can be adjusted separately to avoid the situation where the local temperature in the battery pack is too high or too low, thereby ensuring the performance of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0037] Figure 1 A schematic structural diagram of a battery system according to a first embodiment of the present invention is shown;

[0038] Figure 2A schematic structural diagram of a battery system according to a second embodiment of the present invention is shown;

[0039] Figure 3 A diagram showing the water circuit of the liquid cooling component.

[0040] Icons: 1-battery pack; 2-base plate; 3-liquid cooling plate; 31-heat exchange channel; 32-internal circulation channel; 4-thermal insulation layer; 5-battery shell; 6-heating layer; 61-heating part; 71-three-way valve; 72-valve; 73-circulation pump; 74-liquid inlet pipe; 75-liquid outlet pipe; 8-heat exchange mechanism. DETAILED DESCRIPTION

[0041] The following detailed description is provided to help the reader gain a comprehensive understanding of the methods, devices, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will be apparent upon understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein. Rather, except for operations that must occur in a particular order, changes may be made that will be apparent upon understanding the disclosure of this application. Furthermore, descriptions of features known in the art may be omitted for clarity and brevity.

[0042] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many possible ways to implement the methods, devices, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0043] Throughout the specification, when an element (such as a layer, portion, or substrate) is described as being “on,” “connected to,” “coupled to,” “over,” or “overlaying” another element, it may be directly “on,” “connected to,” “coupled to,” “over,” or “overlaying” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on,” “directly connected to,” “directly coupled to,” “directly over,” or “directly covering” another element, there may be no other elements present between them.

[0044] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0045] Although terms such as "first," "second," and "third" may be used herein to describe various components, parts, portions, layers, or sections, these components, parts, portions, layers, or sections are not limited by these terms. Rather, these terms are used only to distinguish one component, component, portion, layer, or section from another component, component, portion, layer, or section. Thus, a first component, component, portion, layer, or section in the examples described herein may also be referred to as a second component, component, portion, layer, or section without departing from the teachings of the examples.

[0046] For ease of description, spatial relational terms such as "above," "upper," "below," and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element would subsequently be "below" or "lower" relative to the other element. Thus, the term "above" includes both the orientations "above" and "below," depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0047] The terms used herein are intended only to describe various examples and are not intended to limit the present disclosure. Unless the context clearly indicates otherwise, the singular is intended to include the plural. The terms "comprise," "include," and "have" list the presence of stated features, quantities, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0048] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the drawings may occur. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include changes in shapes that occur during manufacturing.

[0049] The features of the examples described herein can be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0050] According to a first aspect of the present application, a battery system is provided, such as Figures 1 to 3As shown, the battery system includes a battery pack and a liquid cooling assembly. The liquid cooling assembly includes a liquid cooling plate 3, a liquid inlet pipe 74, a liquid outlet pipe 75, and multiple valves 72. The battery pack 1 is connected to the liquid cooling plate 3. The liquid cooling plate 3 is divided into multiple cooling sections, each of which is surrounded by heat exchange channels 31. The multiple heat exchange channels 31 in the multiple cooling sections correspond one to one with the multiple valves 72. One end of the heat exchange channel 31 is connected to the liquid inlet pipe 74 through the valve 72 corresponding to the heat exchange channel 31, and the other end of the heat exchange channel 31 is connected to the liquid outlet pipe 75. The multiple heat exchange channels 31 are connected in parallel. Because each heat exchange channel 31 is equipped with a corresponding valve 72, each heat exchange channel 31 can choose whether to circulate the cooling medium based on the heat exchange area within the battery pack 1 corresponding to the heat exchange section. In this way, the temperature of different heat exchange areas within the battery pack 1 can be adjusted separately to avoid localized over-temperature or over-temperature conditions within the battery pack 1, ensuring the performance of the battery pack 1.

[0051] Furthermore, the liquid cooling plate 3 is placed outside the battery pack 1, achieving dry and wet separation and improving the safety of the battery pack 1. Furthermore, for quick-change and capacity-adjustable battery packs 1, placing the liquid cooling plate 3 outside the battery pack 1 eliminates the need to worry about switching the liquid cooling plate 3 during replacement, resulting in greater efficiency and safety.

[0052] Furthermore, each heat exchange channel 31 is correspondingly provided with a three-way valve 71 and a circulation pump 73. The three-way valve 71 includes a first connection port, a second connection port and a third connection port. The third connection port can switch between connecting with the first connection port and connecting with the second connection port. The first connection port is connected to the heat exchange channel 31, and the third connection port is connected to the liquid outlet pipe 75. The cooling part also includes an internal circulation channel 32. The first end of the internal circulation channel 32 is connected to the valve 72, and the second end of the internal circulation channel 32 is connected to the second connection port.

[0053] When cooling the battery pack 1, all valves 72 are open, and all third connections are connected to the first connection. This allows the cooling medium to flow through the liquid inlet pipe 74 to the heat exchange channel 31 and then out through the liquid outlet pipe 75, thereby cooling the battery pack 1. If the temperature of the heat exchange area corresponding to one heat exchange unit is lower than that of the other heat exchange areas, the valve 72 of that heat exchange area can be closed, and the three-way valve 71 can be switched to connect the third connection port to the second connection port. At the same time, the circulation pump 73 is turned on to circulate the cooling medium within the heat exchange channel 31 and the internal circulation channel 32 of the heat exchange unit. The cooling medium in the liquid inlet pipe 74 no longer enters the heat exchange channel 31 of the heat exchange unit, thereby raising the temperature of that heat exchange area.

[0054] When heating the battery pack 1, all valves 72 are open, and all third connectors are connected to the first connector, allowing the cooling medium to flow through the liquid inlet pipe 74 to the heat exchange channel 31 and then out through the liquid outlet pipe 75, thereby heating the battery pack 1. If the temperature of the heat exchange area corresponding to one heat exchange unit is higher than that of the other heat exchange areas, the valve 72 of that heat exchange area can be closed, and the three-way valve 71 can be switched to connect to the second connector, and the circulation pump 73 can be turned on to circulate the cooling medium within the heat exchange channel 31 and the internal circulation channel 32 of the heat exchange unit. The cooling medium in the liquid inlet pipe 74 will no longer enter the heat exchange channel 31 of the heat exchange unit, thereby lowering the temperature of the heat exchange area.

[0055] Optionally, the battery system further includes a battery shell 5 , which is covered on the battery pack 1 .

[0056] like Figure 1 、 Figure 2 and Figure 3 As shown, the battery system also includes a heating layer 6, which includes multiple heating units 61. The heating units 61 correspond one-to-one with the multiple cooling units, and the heating units 61 are in contact with the corresponding cooling units. Thus, when heating the battery pack 1, when the lowest temperature within the battery pack 1 is lower than a first preset minimum temperature, the multiple heating units 61 are controlled to operate; when the lowest temperature within the battery pack 1 is higher than a second preset minimum temperature, the multiple heating units 61 are controlled to stop operating, and the second preset minimum temperature is higher than the first preset minimum temperature. At the same time, if the temperature of one heat exchange region rises too quickly, the heating unit 61 corresponding to that heat exchange region may stop operating for a period of time. When the temperature of that heat exchange region matches that of the other heat exchange regions, the heating units 61 corresponding to the remaining heat exchange regions resume operation.

[0057] Optionally, the heating layer 6 may be a PTC or heating tape.

[0058] It should be noted that Figure 3 In order to conveniently illustrate the correspondence between each heating part 61 and the heat exchange channel 31 of the heat exchange part, each heating part 61 is simplified into a rectangular box. In the entity of the battery system, the heating part 61 is a different area in the entire heating layer 6.

[0059] In addition, the battery system also includes a thermal insulation layer 4, which can be a sheet structure made of foam or other materials. The locations of the thermal insulation layer 4 and the liquid cooling plate 3 can be selected according to needs. In the first embodiment of the present application, Figure 1 As shown, the battery pack 1 is located above the bottom plate 2, the liquid cooling plate 3 is attached to the battery pack 1, the side of the liquid cooling plate 3 facing away from the battery pack 1 is attached to the heating layer 6, and the two sides of the thermal insulation layer 4 are attached to the heating layer 6 and the bottom plate 2 respectively. The liquid cooling plate 3 can be mechanically connected or welded to the bottom plate 2. In the second embodiment of the present application, as shown in FIG. Figure 2 As shown, the battery packs 1 are all located below the base plate 2, the liquid cooling plate 3 is bonded to the side of the base plate 2 facing away from the battery pack 1, and is mechanically connected or welded to the base plate 2, and both sides of the thermal insulation layer 4 are bonded to the heating layer 6 and the liquid cooling plate 3 respectively.

[0060] Optionally, the battery system may also include two battery packs 1, which are respectively located above and below the bottom plate 2. In this case, the thermal insulation layer 4 may be omitted.

[0061] According to a second aspect of the present application, a vehicle is provided, which includes the above-mentioned battery system, which has the same technical effects as the above-mentioned battery system and is not described in detail here.

[0062] According to a third aspect of the present application, a control method for a battery system is provided. The control method for a battery system is used to control the above-mentioned battery system, wherein a heat exchange channel 31 and an internal circulation channel 32 in a cooling unit, a valve 72 corresponding to the heat exchange channel 31, a three-way valve 71, and a circulation pump 73 are defined as a heat exchange mechanism 8. The liquid cooling component is divided into multiple heat exchange mechanisms 8, and the battery pack 1 is divided into multiple heat exchange areas. The multiple heat exchange areas respectively correspond to the multiple heat exchange mechanisms 8, and the heat exchange areas can exchange heat with the corresponding heat exchange channels 31 in the heat exchange mechanisms 8.

[0063] The control method of the battery system includes:

[0064] S1. Obtain the operating temperature of battery pack 1;

[0065] In this step, the BMS of the battery pack 1 obtains the operating temperature of the battery pack 1 including the maximum temperature, the minimum temperature and the average temperature.

[0066] S2. Determine the operating temperature, control the liquid cooling component to be in heating mode or cooling mode, open valve 72, and connect the third connection port to the first connection port;

[0067] In this step, when the maximum temperature is greater than the first temperature T1, the liquid cooling component is controlled to be in cooling mode, and the low-temperature cooling medium flowing into the liquid inlet pipe 74 can enter the heat exchange channel 31; when the minimum temperature is lower than the second temperature T2, the liquid cooling component is controlled to be in heating mode, and the high-temperature cooling medium flowing into the liquid inlet pipe 74 can enter the heat exchange channel 31.

[0068] S3. When the liquid cooling component is in cooling mode, the operating temperature of one heat exchange area is lower than the average temperature of other heat exchange areas, the temperature difference between the operating temperature of the heat exchange area and the average temperature of other heat exchange areas is greater than or equal to the first temperature difference ΔT1, and the duration exceeds the first predetermined time t1, the valve 72 in the heat exchange mechanism 8 corresponding to the heat exchange area is controlled to be closed, the third connection port is switched to be connected to the second connection port, and the circulation pump 73 is operated; when the liquid cooling component is in heating mode, the operating temperature of one heat exchange area is higher than the average temperature of other heat exchange areas, and the temperature difference between the operating temperature of the heat exchange area and the average temperature of other heat exchange areas is greater than or equal to the second temperature difference ΔT2, and the duration exceeds the second predetermined time t2, the valve 72 in the heat exchange mechanism 8 corresponding to the heat exchange area is controlled to be closed, the third connection port is switched to be connected to the second connection port, and the circulation pump 73 is operated.

[0069] Optionally, when the liquid cooling component is in cooling mode, the operating temperature of the heat exchange region may be the average temperature or the lowest temperature of the heat exchange region. When the liquid cooling component is in heating mode, the operating temperature of the heat exchange region may be the average temperature or the highest temperature of the heat exchange region. The average temperature of other heat exchange regions may be the average of the average temperatures of other heat exchange regions.

[0070] Thus, in cooling mode, if the operating temperature of a heat exchange area in the battery pack 1 is significantly lower than that of other heat exchange areas, the low-temperature cooling medium will no longer flow into the corresponding heat exchange channel 31 of the heat exchange area, and the cooling medium will only circulate in the heat exchange channel 31 and the inner circulation channel 32 to prevent the temperature of the heat exchange area from being too low. In heating mode, the heat pump heats the cooling medium. If the operating temperature of a heat exchange area in the battery pack 1 is significantly higher than that of other heat exchange areas, the high-temperature cooling medium will no longer flow into the corresponding heat exchange channel 31 of the heat exchange area, and the cooling medium will only circulate in the heat exchange channel 31 and the inner circulation channel 32 to prevent the temperature of the heat exchange area from being too high.

[0071] When the liquid cooling component is in the cooling mode, the control method of the battery system further includes:

[0072] S4. When the working time of the circulation pump 73 reaches the third predetermined time t3, the operating temperature of the heat exchange area corresponding to the heat exchange mechanism 8 where the circulation pump 73 is located is obtained, and the operating temperature of the heat exchange area is determined;

[0073] S5. When the operating temperature of the heat exchange area is lower than the average temperature of other heat exchange areas, the circulation pump 73 is controlled to stop working; at this time, the cooling medium in the heat exchange channel 31 corresponding to the heat exchange area stops circulating.

[0074] When the operating temperature of a heat exchange zone is greater than or equal to the average temperature of the other heat exchange zones, and this temperature is maintained for a period exceeding the fourth predetermined time t4, valve 72 in heat exchange mechanism 8 corresponding to the heat exchange zone is controlled to open, the third connection port is switched to communicate with the first connection port, and circulation pump 73 stops. At this point, the operating temperature of the heat exchange zone is no longer lower than that of the other zones, and the cooling medium can flow through liquid inlet pipe 74 into heat exchange channel 31 of heat exchange mechanism 8 corresponding to the heat exchange zone, resuming circulation of the cooling medium.

[0075] In addition, when the cooling medium circulates only in the heat exchange channel 31 and the internal circulation channel 32, if the operating temperature of the heat exchange area rises suddenly and the temperature difference between the operating temperature and the average temperature of other areas is greater than the fourth temperature difference ΔT4, the circulation pump 73 in the heat exchange mechanism 8 corresponding to the heat exchange area is immediately closed, the valve 72 is opened, and the third connection port is switched to connect with the first connection port to avoid the temperature of the heat exchange area being too high.

[0076] S6. When the temperature difference between the operating temperature of the heat exchange region and the average temperature of the other heat exchange regions is greater than or equal to the third temperature difference ΔT3 and is maintained for more than the fifth predetermined time t5, control the circulation pump 73 in the heat exchange mechanism 8 corresponding to the heat exchange region to operate;

[0077] In this step, the heat exchange capacity of the heat exchange mechanism 8 cannot meet the heat exchange requirements of the heat exchange area. At this time, turning on the circulation pump 73 can increase the flow rate of the cooling medium in the heat exchange channel 31 in the heat exchange mechanism 8 to improve the cooling capacity of the heat exchange area.

[0078] S7, when the operating temperature of the heat exchange area is less than or equal to the operating temperature of other heat exchange areas, and the holding time exceeds the sixth predetermined time t6, controlling the circulation pump 73 in the heat exchange mechanism 8 corresponding to the heat exchange area to stop working;

[0079] In this step, when the operating temperature of the heat exchange area corresponding to the heat exchange mechanism 8 whose heat exchange capacity is increased by the circulation pump 73 is less than or equal to the operating temperature of other heat exchange areas, and the maintenance time exceeds the sixth predetermined time t6, the circulation pump 73 stops working, which can prevent the temperature of the heat exchange area from further decreasing.

[0080] S8. When the operating temperature of the heat exchange area is lower than the stop temperature T' and the maintenance time exceeds the seventh predetermined time t7, the liquid cooling component is controlled to stop working.

[0081] Since the operating temperature of the heat exchange area is already lower than the preset temperature T', there is no need to continue cooling at this time, the liquid cooling component stops working, and the cooling medium no longer circulates.

[0082] When the liquid cooling component is in the heating mode, the control method of the battery system further includes:

[0083] S4. When the operating time of the circulation pump 73 reaches the eighth predetermined time t8, the temperature of the heat exchange area corresponding to the heat exchange mechanism 8 where the circulation pump 73 is located is obtained, and the temperature of the heat exchange area is determined;

[0084] S5. When the operating temperature of the heat exchange area is higher than the average temperature of other heat exchange areas, the circulating pump 73 is controlled to stop working; at this time, the cooling medium in the heat exchange channel 31 corresponding to the heat exchange area stops circulating to avoid the temperature of the heat exchange area being too high.

[0085] When the operating temperature of a heat exchange zone is lower than or equal to the average temperature of the other heat exchange zones, and this temperature remains lower than the ninth predetermined time t9, valve 72 in heat exchange mechanism 8 corresponding to that heat exchange zone is controlled to open, the third connection port is switched to communicate with the first connection port, and circulation pump 73 stops. At this point, the operating temperature of that heat exchange zone is no longer higher than that of the other zones, and the cooling medium can flow through liquid inlet pipe 74 into heat exchange channel 31 of heat exchange mechanism 8 corresponding to that heat exchange zone, resuming circulation of the cooling medium.

[0086] In addition, when the cooling medium circulates only in the heat exchange channel 31 and the internal circulation channel 32, if the operating temperature of the heat exchange area drops sharply and the temperature difference between the operating temperature and the average temperature of other areas is greater than the fifth temperature difference ΔT5, the circulation pump 73 in the heat exchange mechanism 8 corresponding to the heat exchange area works, opens the valve 72, and switches the third connection port to connect with the first connection port to avoid the temperature of the heat exchange area being too low.

[0087] When the liquid cooling component is in the heating mode, the control method of the battery system further includes:

[0088] When the lowest temperature in the battery pack 1 is lower than the first preset lowest temperature, the plurality of heating units 61 are controlled to operate;

[0089] That is, when the minimum temperature of the battery pack 1 is too low, all heating units 61 can be turned on to improve the heating efficiency of the battery pack 1. In addition, if the temperature of one heat exchange area rises too quickly, the heating unit 61 corresponding to that heat exchange area can be stopped for a period of time. When the temperature of that heat exchange area reaches the same level as that of the other heat exchange areas, the heating units 61 corresponding to the remaining heat exchange areas can resume operation.

[0090] When the lowest temperature in the battery pack 1 is higher than the second preset lowest temperature, the multiple heating units 61 are controlled to stop working, and there is no need to continue heating by the heating units 61. Preferably, the second preset lowest temperature is higher than the first preset lowest temperature, and the first preset temperature is higher than the second temperature.

[0091] In addition, the control method of the battery system also includes:

[0092] When the maximum temperature in the battery pack 1 is greater than the first preset maximum temperature, the valves 72 in the plurality of heat exchange mechanisms 8 are controlled to open, and the third connection port is connected to the first connection port;

[0093] The first preset maximum temperature here is the maximum allowable temperature of the battery system. That is to say, no matter whether the cooling component is in heating mode or cooling mode, when the maximum temperature in the battery pack 1 is greater than the first preset maximum temperature, all valves 72 are opened, the circulation pumps 73 are opened, and the third connection port is switched to the first connection port to force cooling of the battery pack 1.

[0094] When the maximum temperature in the battery pack 1 is greater than the second preset maximum temperature, the circulation pumps 73 in the plurality of heat exchange mechanisms 8 are controlled to operate, and the second preset maximum temperature is greater than the first preset maximum temperature.

[0095] The second preset maximum temperature here is the thermal diffusion alarm temperature of the battery pack 1. That is, if the temperature continues to rise to the thermal diffusion alarm temperature after forced cooling, all circulation pumps 73 are turned on to increase the heat exchange capacity of the entire cooling assembly.

[0096] It should be noted that the above-mentioned first preset time t1, second preset time t2, third preset time t3, fourth preset time t4, fifth preset time t5, sixth preset time t6, seventh preset time t7, eighth preset time t8, ninth preset time t9, first preset maximum temperature, second preset maximum temperature, first preset minimum temperature, second preset minimum temperature, first temperature difference ΔT1, second temperature difference ΔT2, third temperature difference ΔT3, fourth temperature difference ΔT4, stop temperature T', first temperature T1 and second temperature T2 can be selected according to the model of the battery pack 1 in the battery system.

[0097] Taking the battery pack 1 divided into four heat exchange zones as an example, when the BMS detects that the highest temperature in the entire battery pack 1 is greater than or equal to 35°C, all valves 72 are opened, and all three-way valves 71 are switched to the third connection port to connect with the first connection port. At this time, the low-temperature cooling medium can flow into the heat exchange channel 31, thereby cooling the entire battery pack 1. When it is detected that the average temperature of zone 1 is lower than the average of the average temperatures of zones 2, 3, and 4, the temperature exceeds 4°C, and the time exceeds 5 seconds, the two-way valve of zone 1 is closed, the circulation pump 73 is opened, and the three-way valve 71 is switched to the third connection port to connect with the second connection port, allowing the cooling medium to pass through the internal circulation channel 32 and the heat exchange channel 31 to form an internal circulation. If, after 3 minutes, the average temperature of zone 1 is still lower than the average of the average temperatures of zones 2, 3, and 4, the circulation pump 73 is turned off, and the internal circulation is stopped. When the average temperature of area 1 is higher than the average of the average temperatures of areas 2, 3 and 4 for more than 10 seconds, or the temperature rises suddenly and is 4°C higher than the overall average temperature, the circulation pump 73 is immediately turned off, the two-way valve is opened, and the three-way valve 71 is switched to the third connection port to connect with the first connection port, and the cooling medium resumes external circulation.

[0098] If the average temperature of zone 1 is 3°C higher than the average of the average temperatures of zones 2, 3, and 4, circulation pump 73 is turned on to increase the flow rate in zone 1 and improve cooling capacity. If the average temperature of zone 1 is 2°C lower than the average of the average temperatures of zones 2, 3, and 4 for more than 10 seconds, circulation pump 73 is turned off. If the average temperature of the entire battery pack is lower than 33°C for more than 30 seconds, the entire liquid cooling assembly is shut down.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery system, characterized in that: The battery system includes a battery pack and a liquid cooling assembly, wherein the liquid cooling assembly includes a liquid cooling plate, a liquid inlet pipe, a liquid outlet pipe, and multiple valves. The battery pack is connected to the liquid cooling plate, and the liquid cooling plate is divided into multiple cooling sections, each of which is surrounded by heat exchange channels. The multiple heat exchange channels in the multiple cooling sections correspond one-to-one to the multiple valves. One end of the heat exchange channel is connected to the liquid inlet pipe through the valve corresponding to the heat exchange channel, and the other end of the heat exchange channel is connected to the liquid outlet pipe. The multiple heat exchange channels are connected in parallel.

2. The battery system according to claim 1, wherein: Each of the heat exchange channels is correspondingly provided with a three-way valve and a circulation pump, the three-way valve including a first connection port, a second connection port, and a third connection port, the third connection port being switchable between being connected to the first connection port and being connected to the second connection port, the first connection port being connected to the heat exchange channel, and the third connection port being connected to the liquid outlet pipe; The cooling portion further includes an internal circulation channel, a first end of the internal circulation channel is connected to the valve, and a second end of the internal circulation channel is connected to the second connecting port.

3. The battery system according to claim 2, characterized in that The battery system further includes a heating layer, which includes a plurality of heating parts. The heating parts correspond to the plurality of cooling parts one by one, and the heating parts are bonded to the corresponding cooling parts.

4. A vehicle, characterized in that: The vehicle comprises the battery system according to any one of claims 1 to 3.

5. A method for controlling a battery system, characterized in that: The battery system control method is used to control the battery system according to claim 3, wherein the heat exchange channel and the internal circulation channel in one of the cooling units, the valve corresponding to the heat exchange channel, the three-way valve, and the circulation pump are defined as a heat exchange mechanism, the liquid cooling assembly includes multiple heat exchange mechanisms, the battery pack is divided into multiple heat exchange areas, the multiple heat exchange areas respectively correspond to the multiple heat exchange mechanisms, and the heat exchange areas are capable of exchanging heat with the heat exchange channels in the corresponding heat exchange mechanisms; The control method of the battery system includes: S1. Obtaining the operating temperature of the battery pack; S2. Determine the operating temperature, control the liquid cooling component to be in a heating mode or a cooling mode, open the valve, and connect the third connection port to the first connection port; S3, when the liquid cooling assembly is in cooling mode, the operating temperature of one of the heat exchange areas is lower than the average temperature of the other heat exchange areas, the temperature difference between the operating temperature of the heat exchange area and the average temperature of the other heat exchange areas is greater than or equal to a first temperature difference ΔT1, and the temperature difference lasts for more than a first predetermined time t1, controlling the valve in the heat exchange mechanism corresponding to the heat exchange area to close, switching the third connection port to communicate with the second connection port, and operating the circulation pump; When the liquid cooling component is in the heating mode, the operating temperature of one of the heat exchange areas is higher than the average temperature of the other heat exchange areas, the temperature difference between the operating temperature of the heat exchange area and the average temperature of the other heat exchange areas is greater than or equal to the second temperature difference ΔT2, and the duration exceeds the second predetermined time t2, the valve in the heat exchange mechanism corresponding to the heat exchange area is controlled to close, the third connection port is switched to be connected to the second connection port, and the circulation pump is started.

6. The control method of the battery system according to claim 5, characterized in that: When the liquid cooling assembly is in a cooling mode, the control method of the battery system further includes: S4. When the working time of the circulating pump reaches a third predetermined time t3, obtaining the operating temperature of the heat exchange area corresponding to the heat exchange mechanism where the circulating pump is located, and determining the operating temperature of the heat exchange area; S5. When the operating temperature of the heat exchange area is lower than the average temperature of other heat exchange areas, control the circulation pump to stop working; When the operating temperature of the heat exchange area is greater than or equal to the average temperature of other heat exchange areas, and the maintenance time exceeds the fourth predetermined time t4, the valve in the heat exchange mechanism corresponding to the heat exchange area is controlled to open, the third connection port is switched to be connected to the first connection port, and the circulation pump stops working.

7. The control method of the battery system according to claim 6, characterized in that: The control method of the battery system further includes: S6, when the temperature difference between the operating temperature of the heat exchange region and the average temperature of other heat exchange regions is greater than or equal to the third temperature difference ΔT3 and is maintained for more than a fifth predetermined time t5, controlling the circulation pump in the heat exchange mechanism corresponding to the heat exchange region to operate; S7, when the operating temperature of the heat exchange area is less than or equal to the average temperature of other heat exchange areas, and the maintenance time exceeds a sixth predetermined time t6, controlling the circulation pump in the heat exchange mechanism corresponding to the heat exchange area to stop working; S8. When the operating temperature of the heat exchange area is lower than the stop temperature T' and the maintenance time exceeds a seventh predetermined time t7, the liquid cooling component is controlled to stop working.

8. The control method of the battery system according to claim 5, characterized in that: When the liquid cooling assembly is in a heating mode, the control method of the battery system further includes: S4. When the working time of the circulation pump reaches an eighth predetermined time t8, obtaining the temperature of the heat exchange area corresponding to the heat exchange mechanism where the circulation pump is located, and determining the temperature of the heat exchange area; S5. When the operating temperature of the heat exchange area is higher than the average temperature of other heat exchange areas, the circulating pump is controlled to stop working; When the operating temperature of the heat exchange area is less than or equal to the average temperature of other heat exchange areas, and the maintenance time exceeds the ninth predetermined time t9, the valve in the heat exchange mechanism corresponding to the heat exchange area is controlled to open, the third connection port is switched to be connected to the first connection port, and the circulation pump stops working.

9. The method for controlling a battery system according to claim 8, wherein: The control method of the battery system further includes: When the lowest temperature in the battery pack is lower than a first preset lowest temperature, controlling the plurality of heating units to operate; When the lowest temperature in the battery pack is greater than a second preset lowest temperature, the plurality of heating units are controlled to stop working, and the second preset lowest temperature is greater than the first preset lowest temperature.

10. The method for controlling a battery system according to any one of claims 5 to 9, characterized in that: The control method of the battery system further includes: When the maximum temperature of one of the heat exchange areas is greater than a first preset maximum temperature, controlling the circulation pump in the heat exchange mechanism corresponding to the heat exchange area to operate, controlling the valves in the multiple heat exchange mechanisms to open, and connecting the third connection port to the first connection port; When the maximum temperature of the heat exchange area is greater than a second preset maximum temperature, the circulation pumps in the plurality of heat exchange mechanisms are controlled to operate, and the second preset maximum temperature is greater than the first preset maximum temperature.

Images