Power battery temperature regulating system, battery assembly and electric vehicle
By setting temperature regulating sections on both sides of the battery and using a control device to regulate the flow of the medium, the problems of slow battery cooling speed and uneven cooling are solved, achieving rapid and uniform temperature regulation and extending the battery's service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- 悠跑科技(合肥)有限公司
- Filing Date
- 2022-05-18
- Publication Date
- 2026-08-04
AI Technical Summary
In existing technologies, the cooling rate of power batteries is slow and the cooling is uneven, resulting in a large temperature difference on different sides of the battery, which affects the battery's cycle life.
Temperature regulating sections are set on both sides of the battery, and the flow of the temperature regulating medium is selectively controlled by a control device according to the temperature information to achieve independent or combined temperature regulation of both sides of the battery, including heating or cooling.
It improves the speed of temperature regulation, reduces temperature difference, extends the cycle life of the battery, and can flexibly adapt to different temperature conditions, ensuring that the battery operates within the optimal operating temperature range.
Smart Images
Figure CN117134015B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of new energy vehicles, and in particular to a power battery temperature regulation system, battery components, and electric vehicles. Background Technology
[0002] Battery liquid cooling system: A circulation system that uses a water pump to drive coolant such as ethylene glycol to flow in cooling pipes to cool or heat the power battery. Cooling of the coolant generally comes from the vehicle's air conditioning system, while heating generally comes from a separate heater or a heater shared with the vehicle's air conditioning system.
[0003] In existing technologies, cooling plates are typically placed at the bottom of the battery, which results in slow cooling and uneven cooling along the battery's height. Additionally, there are significant temperature differences between different sides of the battery (e.g., top and bottom), which is detrimental to improving battery cycle life. Summary of the Invention
[0004] This invention provides a power battery temperature regulation system, battery pack, and electric vehicle to solve the problems of slow cooling speed, uneven cooling, and large temperature difference between different sides.
[0005] According to a first aspect of the present invention, a power battery temperature regulation system for an electric vehicle is provided, comprising: an inlet pipe for a temperature regulation medium, an outlet pipe, a first temperature regulation section, a second temperature regulation section, a flow selection section, and a control device;
[0006] The inlet pipeline is connected to the medium inlet of the first temperature-regulating unit and the medium inlet of the second temperature-regulating unit via the selective flow section. The medium outlet of the first temperature-regulating unit and the medium outlet of the second temperature-regulating unit are directly or indirectly connected to the outlet pipeline. The selective flow section can selectively send the temperature-regulating medium into the first temperature-regulating unit and / or the second temperature-regulating unit under the control of the control device.
[0007] The first temperature regulating part is disposed on the first side of the battery to regulate the temperature of the first side of the battery through the temperature regulating medium entering the first temperature regulating part; the second temperature regulating part is disposed on the second side of the battery to regulate the temperature of the second side of the battery through the temperature regulating medium entering the second temperature regulating part.
[0008] The control device is used for:
[0009] Acquire first temperature information and second temperature information; the first temperature information represents the temperature of a first side of the battery, and the second temperature information represents the temperature of a second side of the battery;
[0010] By controlling the selected flow section, the first temperature information and the second temperature information are adjusted to meet preset requirements.
[0011] Optionally, when the control device adjusts the first temperature information and the second temperature information to meet preset requirements by controlling the selected flow section, it is specifically used for:
[0012] If both the first temperature information and the second temperature information are greater than the preset first temperature threshold, then the selection flow section is controlled to send the first temperature regulating medium for cooling into the first temperature regulating section and the second temperature regulating section, and the temperature of the first temperature regulating medium is lower than the first temperature threshold.
[0013] If both the first temperature information and the second temperature information are less than a preset second temperature threshold, then the selection flow section is controlled to send the second temperature regulating medium for heating into the first temperature regulating section and the second temperature regulating section. The temperature of the second temperature regulating medium is higher than the second temperature threshold, and the temperature of the second temperature regulating medium is lower than the temperature of the first temperature regulating medium.
[0014] Optionally, the second temperature regulating part is located on the upper side of the battery, and the first temperature regulating part is located on the lower side of the battery;
[0015] When the control device adjusts the first temperature information and the second temperature information to meet preset requirements by controlling the selected flow section, it is specifically used for:
[0016] If the first temperature information is greater than the first temperature threshold and the second temperature information is less than the preset third temperature threshold, then the selected flow section is controlled to send the first temperature regulating medium into the first temperature regulating section and refuse to send the first temperature regulating medium into the second temperature regulating section. The temperature of the first temperature regulating medium is lower than the third temperature threshold and the third temperature threshold is lower than the first temperature threshold.
[0017] If the second temperature information is greater than the first temperature threshold and the first temperature information is less than the third temperature threshold, then the selected flow section is controlled to send the first temperature regulating medium into the second temperature regulating section and refuse to send the first temperature regulating medium into the first temperature regulating section.
[0018] If the first temperature information is less than a preset second temperature threshold and the second temperature information is greater than a preset fourth temperature threshold, then the selected flow section is controlled to send the second temperature regulating medium into the first temperature regulating section and refuse to send the second temperature regulating medium into the second temperature regulating section. The temperature of the second temperature regulating medium is higher than the fourth temperature threshold and the fourth temperature threshold is higher than the second temperature threshold.
[0019] If the second temperature information is less than the second temperature threshold and the first temperature information is greater than the fourth temperature threshold, then the selected flow section is controlled to send the second temperature regulating medium into the second temperature regulating section and refuse to send the second temperature regulating medium into the first temperature regulating section.
[0020] Wherein, the temperature of the first temperature regulating medium is lower than the first temperature threshold; the temperature of the second temperature regulating medium is higher than the second temperature threshold; and the temperature of the second temperature regulating medium is lower than the temperature of the first temperature regulating medium.
[0021] Optionally, if both the first temperature information and the second temperature information are less than the third temperature threshold and both are greater than the fourth temperature threshold, then the selected flow section is controlled to refuse to send the corresponding temperature-regulating medium into the first temperature-regulating section and the second temperature-regulating section.
[0022] Optionally, the first temperature threshold is in the range of 35 degrees Celsius to 45 degrees Celsius, and the second temperature threshold is in the range of -2 degrees Celsius to -12 degrees Celsius.
[0023] Optionally, the first temperature regulating unit includes at least one first liquid cooling plate; the second temperature regulating unit includes at least one second liquid cooling plate.
[0024] If there are multiple first liquid cooling plates, then the multiple first liquid cooling plates are connected in series;
[0025] If there are multiple second liquid cooling plates, then the multiple second liquid cooling plates are connected in series.
[0026] Optionally, the flow selection section includes an electrically controlled three-way valve controlled by the control device.
[0027] Optionally, the medium outlet of the first temperature regulating unit is connected to the discharge pipeline via a three-way connector and a first one-way valve; the medium outlet of the first temperature regulating unit is connected to the discharge pipeline via the three-way connector and a second one-way valve.
[0028] According to a second aspect of the present invention, a battery assembly for an electric vehicle is provided, comprising a power battery temperature regulation system as described in the first aspect and its alternatives, the battery, and a lower housing; the battery is disposed in the lower housing.
[0029] According to a third aspect of the invention, an electric vehicle is provided, comprising the battery assembly of the second aspect.
[0030] The power battery temperature regulation system, battery pack, and electric vehicle provided by this invention have temperature regulation units (i.e., a first temperature regulation unit and a second temperature regulation unit) arranged on both sides of the battery. Compared to a scheme where the temperature regulation unit is arranged on only one side, this invention provides a reliable hardware means for selectively regulating the temperature on one side (i.e., heating or cooling) or simultaneously regulating the temperature on both sides (i.e., heating or cooling). Furthermore, the scheme of simultaneously regulating the temperature on both sides helps to improve the speed of temperature regulation, while the scheme of selectively regulating the temperature on one side helps to reduce the temperature difference, thereby improving the battery cycle life. Simultaneously, this invention controls the temperature regulation based on first and second temperature information, ensuring that the temperature regulation result accurately adapts to the actual temperature and changes flexibly. Attached Figure Description
[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0032] Figure 1 This is a schematic diagram of the structure of a power battery temperature regulation system in one embodiment of the present invention. Figure 1 ;
[0033] Figure 2 This is a schematic diagram of the structure of a power battery temperature regulation system in one embodiment of the present invention. Figure 2 ;
[0034] Figure 3 This is a schematic diagram of the structure of a battery assembly in one embodiment of the present invention. Figure 1 ;
[0035] Figure 4 This is a schematic diagram of the battery assembly structure in one embodiment of the present invention. Figure 2 ;
[0036] Figure 5 yes Figure 4 A magnified view of part A in the middle;
[0037] Figure 6 This is a schematic diagram of the structure of a battery assembly in one embodiment of the present invention. Figure 3 ;
[0038] Figure 7 yes Figure 6 A magnified view of part B in the middle section;
[0039] Figure 8 This is a schematic diagram of the control flow of the control device in one embodiment of the present invention.
[0040] Explanation of reference numerals in the attached figures:
[0041] 1-First temperature control section;
[0042] 101 - First liquid cooling plate;
[0043] 2-Second temperature control section;
[0044] 201 - Second liquid cooling plate;
[0045] 3- Entering the pipeline;
[0046] 4- Select the distribution department;
[0047] 401-Electrically controlled three-way valve;
[0048] 5-Control device;
[0049] 6-Discharge pipeline;
[0050] 7-First check valve;
[0051] 8-Second check valve;
[0052] 9-Tee connector;
[0053] 10-cell battery;
[0054] 11-Lower shell. Detailed Implementation
[0055] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0056] In the description of this invention, it should be understood that the terms "upper part", "lower part", "upper end", "lower end", "lower surface", "upper surface", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.
[0057] In the description of this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
[0058] In the description of this invention, "a plurality of" means multiple, such as two, three, four, etc., unless otherwise explicitly specified.
[0059] In the description of this invention, unless otherwise explicitly specified and limited, the term "connection" and other such terms should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection, an electrical connection, or a connection that allows communication between the components; it can refer to a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0060] The technical solution of the present invention will be described in detail below with reference to specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.
[0061] Please refer to Figures 1 to 7 This invention provides a power battery temperature regulation system for electric vehicles, comprising: an inlet pipe 3 for a temperature regulation medium, an outlet pipe 6, a first temperature regulation unit 1, a second temperature regulation unit 2, a flow selection unit 4, and a control device 5.
[0062] The inlet pipe 3 and outlet pipe 6 can be any pipe that can allow the flow of temperature-regulating medium. No matter how the shape, position, or size of the pipe changes, it does not deviate from the scope of the present invention. At the same time, various valves and detection devices can also be installed in the inlet pipe and outlet pipe.
[0063] The inlet pipe 3 is connected to the medium inlet of the first temperature regulating section 1 and the medium inlet of the second temperature regulating section 2 respectively through the selective flow section 4. The selective flow section 4 can selectively send the temperature regulating medium into the first temperature regulating section 1 and / or the second temperature regulating section 2 under the control of the control device 5. The medium outlet of the first temperature regulating section 1 and the medium outlet of the second temperature regulating section 2 are directly or indirectly connected to the outlet pipe 6.
[0064] The temperature-regulating medium can be either a first temperature-regulating medium for cooling or a second temperature-regulating medium for heating. This temperature-regulating medium can be liquid or gaseous, water, or other suitable temperature-regulating media, such as ethylene glycol or other coolants. Furthermore, the first and second temperature-regulating media can be made of the same material or different materials.
[0065] In some embodiments, the inlet pipe 3 may be connected to one or more media sources to obtain the first temperature-regulating medium and the second temperature-regulating medium.
[0066] In one example, the inlet pipe 3 can be connected to a first medium source of a first temperature-regulating medium and a second medium source of a second temperature-regulating medium, respectively; when the first medium source is needed, the first temperature-regulating medium is introduced, and when the second medium source is needed, the second temperature-regulating medium is introduced; the first medium source can form and send out the first temperature-regulating medium, and the second medium source can form and send out the second temperature-regulating medium.
[0067] In another example, the inlet pipe 3 may be connected to only one medium source, which can be controlled to generate and deliver different temperature-regulating media (i.e., deliver a first temperature-regulating medium or deliver a second temperature-regulating medium).
[0068] In some of the above examples, the discharge pipe 6 can also be connected to a medium source to form a circulation of temperature-regulating medium. The temperature-regulating medium can be cooled or heated after circulating back to the medium source, thereby forming the corresponding first or second temperature-regulating medium.
[0069] In some examples, the cooling capacity of the temperature-regulating medium at the medium source to form the first temperature-regulating medium can come from the vehicle's air conditioning system. For example, heat exchange between the temperature-regulating medium and the vehicle's air conditioning system can be achieved in the medium source to form the first temperature-regulating medium that meets the temperature requirements. The heat of the temperature-regulating medium at the medium source to form the second temperature-regulating medium can come from a separate heater or the vehicle's air conditioning system heater. For example, heat exchange between the temperature-regulating medium and the heater can be achieved in the medium source to form the second temperature-regulating medium that meets the temperature requirements. In this case, the heater can also be regarded as part of the medium source.
[0070] The medium source may include, for example, a heat exchanger and various connecting pipes that enable the heat exchanger to function.
[0071] The selective flow section 4 can be any component or combination of components capable of selective flow and controlled by the control device 5. For one example, please refer to... Figures 2 to 7 The selected flow section 4 includes an electrically controlled three-way valve 41 controlled by the control device. In another example, the selected flow section 4 may also include a first solenoid valve, a second solenoid valve, and a three-way pipe. The first port of the three-way pipe is connected to the inlet pipe 3, the second port of the three-way pipe is connected to the first temperature control section through the first solenoid valve, and the third port of the three-way pipe is connected to the second temperature control section through the second solenoid valve. The two solenoid valves can be controlled by the control device.
[0072] In this embodiment of the invention, the first temperature regulating unit 1 is disposed on the first side of the battery 10 to regulate the temperature of the first side of the battery 10 by means of a temperature regulating medium (e.g., a first temperature regulating medium and a second temperature regulating medium) entering the first temperature regulating unit 1, and the second temperature regulating unit 2 is disposed on the second side of the battery 10 to regulate the temperature of the second side of the battery 10 by means of a temperature regulating medium (e.g., a first temperature regulating medium and a second temperature regulating medium) entering the second temperature regulating unit 2.
[0073] In this case, the first side and the second side of the battery 10 can be opposite sides, while in other examples, the first side and the second side of the battery 10 can also be adjacent sides.
[0074] exist Figures 2 to 7 In the example shown, the first side of battery 10 refers to the lower side of the battery, and the second side of battery 10 refers to the upper side of the battery. Other examples may not be limited to this definition.
[0075] In one implementation method, please refer to Figures 3 to 7 The first temperature regulating unit 1 includes at least one first liquid cooling plate 101; the second temperature regulating unit 2 includes at least one second liquid cooling plate 201.
[0076] The liquid cooling plate can be any plate-shaped component that allows a liquid temperature-regulating medium to pass through.
[0077] In some examples, taking the figure as an example, there is one first liquid cooling plate 101 and one second liquid cooling plate 201. The second liquid cooling plate 201 and the first liquid cooling plate 101 are respectively arranged on the upper and lower end faces of the battery 10. The second liquid cooling plate 201 and the first liquid cooling plate 101 are arranged in parallel.
[0078] In other examples, if there are multiple first liquid cooling plates, then the multiple first liquid cooling plates are connected in series; if there are multiple second liquid cooling plates, then the multiple second liquid cooling plates are connected in series.
[0079] The first liquid cooling plate 101 and the second liquid cooling plate 201 can be integrally molded liquid cooling plates. The cooling plate process can be extruded harmonica tube type cooling plate or brazed cooling plate. Compared with the traditional combination of multiple split cooling plates in series or parallel, there are fewer parts and the system reliability is higher.
[0080] In one embodiment, the medium outlet of the first temperature regulating unit 1 (e.g., the first liquid cooling plate 101) is connected to the discharge pipeline 6 via a three-way connector 9 and a first one-way valve 7; the medium outlet of the first temperature regulating unit 1 is connected to the discharge pipeline 6 via the three-way connector 9 and a second one-way valve 8.
[0081] The first check valve 7 can be understood as a component or component combination that prevents the temperature-regulating medium from returning from the discharge pipe 6 to the first temperature-regulating part, and the second check valve 8 can be understood as a component or component combination that prevents the temperature-regulating medium from returning from the discharge pipe 6 to the second temperature-regulating part.
[0082] The first check valve 7 and the second check valve 8 can prevent abnormal coolant flow such as backflow or turbulence from forming in different operating modes of the cooling system.
[0083] The battery 10 can be a single-layer battery system composed of multiple battery modules combined horizontally / vertically or a single-layer battery system composed of multiple individual cells combined horizontally / vertically, with both the upper and lower surfaces of the battery being flat.
[0084] This invention also provides a battery assembly for an electric vehicle, including the power battery temperature regulation system mentioned in this invention, the battery 10, and a lower housing 11. The battery 10 is disposed in the lower housing 11.
[0085] In a specific example, the battery 10 is installed inside the lower housing 11, the first liquid cooling plate 101 is arranged between the upper surface of the lower housing 11 and the lower end face of the battery 10, the second liquid cooling plate 201 is arranged on the upper end face of the battery 10, and the inlet pipe, the electronically controlled three-way valve, the first one-way valve 7, the second one-way valve 8, the three-way connector 9 (e.g., a T-type connector) and the outlet pipe 6 are arranged between the side of the battery 10 and the inside of the lower housing 11.
[0086] The battery pack portion entering the pipeline is connected to the inlet of the electronically controlled three-way valve. The two outlets of the electronically controlled three-way valve 401 are connected to the inlets of the first liquid cooling plate 101 and the second liquid cooling plate 201, respectively. The electronically controlled three-way valve has two outlets, outlet 1 and outlet 2. Furthermore, by receiving electrical signals from the vehicle thermal management control system (i.e., the control device), four operating modes can be achieved: both outlet 1 and outlet 2 are open; outlet 1 is open and outlet 2 is closed; outlet 1 is closed and outlet 2 is open; and both outlet 1 and outlet 2 are closed.
[0087] During system operation, the temperature-regulating medium enters the electrically controlled three-way valve 401 through inlet pipe 3. Depending on the valve's operating mode, the medium can be distributed to the first liquid cooling plate 101 and / or the second liquid cooling plate 201. The coolant passing through these plates then flows through the first one-way valve 7 and / or the second one-way valve 8, before converging through a T-connector to the outlet pipe, ultimately exiting the battery pack. This circulating flow of coolant achieves the function of cooling the upper and / or lower ends of the battery.
[0088] The on / off control of the two outlets is achieved through an electrically controlled three-way valve. Figure 8 For example, the entire system can implement four working modes:
[0089] Mode 1: The first liquid cooling plate is working, and the second liquid cooling plate is working;
[0090] Mode 2: The first liquid cooling plate is working, while the second liquid cooling plate is not working;
[0091] Mode 3: The first liquid cooling plate is not working, and the second liquid cooling plate is working;
[0092] Mode 4: The first liquid cooling plate is not working, and the second liquid cooling plate is working.
[0093] The control device is used for:
[0094] Acquire first temperature information and second temperature information; the first temperature information represents the temperature of a first side of the battery, and the second temperature information represents the temperature of a second side of the battery;
[0095] By controlling the selected flow section, the first temperature information and the second temperature information are adjusted to meet preset requirements.
[0096] For further examples, please refer to Figure 8 The first temperature information can be represented as T below, the second temperature information can be represented as T above, and correspondingly, the first temperature threshold can be represented as T1, the second temperature threshold can be represented as T2, the third temperature threshold can be represented as T3, and the fourth temperature threshold can be represented as T4.
[0097] When the control device adjusts the first temperature information and the second temperature information to meet preset requirements by controlling the selected flow section, it is specifically used for:
[0098] If both the first temperature information and the second temperature information are greater than the preset first temperature threshold (i.e., T_lower > T_1, T_upper > T_1), then the selected flow section is controlled to send the first temperature regulating medium for cooling into the first temperature regulating section and the second temperature regulating section. At this time, mode 1 is entered, and the temperature of the first temperature regulating medium is lower than the first temperature threshold.
[0099] If both the first temperature information and the second temperature information are less than the preset second temperature threshold (i.e., T_lower < T_2, T_upper < T_2), then the selected flow section is controlled to send the second temperature regulating medium for heating into the first temperature regulating section and the second temperature regulating section. At this time, mode 1 is entered, where the temperature of the second temperature regulating medium is higher than the second temperature threshold and the temperature of the second temperature regulating medium is lower than the temperature of the first temperature regulating medium.
[0100] By using cooling and heating in Mode 1, cooling and heating can be performed from both sides of the battery, thereby:
[0101] When applied to heating, due to the arrangement of parallel liquid cooling plates, both sides of the battery (e.g., the upper and lower end faces) can be heated simultaneously with a large flow rate. The temperature difference between the inlet and outlet of each liquid cooling plate is large, the heat exchange is large, and the heating power is high, which can achieve a faster heating rate, thereby shortening the vehicle's low-temperature warm-up time.
[0102] When applied to cooling, after receiving a signal from the control device, it can simultaneously achieve high-flow cooling on both sides of the battery (e.g., the upper and lower end faces). Due to the arrangement of parallel liquid cooling plates, the temperature difference between the inlet and outlet of each liquid cooling plate is large, the heat exchange is large, and the cooling power is high. It can simultaneously heat the upper and lower end faces of the battery and rapidly achieve high-flow cooling on the upper and lower end faces of the battery, which can extend the thermal diffusion time after thermal runaway of the battery and make it safer.
[0103] In some examples, when the control device adjusts the first temperature information and the second temperature information to meet preset requirements by controlling the selected flow section, it is specifically used for:
[0104] If the first temperature information is greater than the first temperature threshold and the second temperature information is less than the preset third temperature threshold (i.e., T below > T1, T above < T3), then the selected flow section is controlled to send the first temperature regulating medium into the first temperature regulating section and refuse to send the first temperature regulating medium into the second temperature regulating section, that is, enter mode 2, where the temperature of the first temperature regulating medium is lower than the third temperature threshold and the third temperature threshold is lower than the first temperature threshold.
[0105] If the second temperature information is greater than the first temperature threshold and the first temperature information is less than the third temperature threshold (i.e., Tupper>T1, Tlower<T3), then the selection flow section is controlled to send the first temperature regulating medium into the second temperature regulating section and refuse to send the first temperature regulating medium into the first temperature regulating section, i.e., enter mode 3.
[0106] If the first temperature information is less than the preset second temperature threshold, and the second temperature information is greater than the preset fourth temperature threshold (i.e., T_lower < T_2, T_upper > T_4), then the selected flow section is controlled to send the second temperature regulating medium into the first temperature regulating section and refuse to send the second temperature regulating medium into the second temperature regulating section, i.e., enter mode 2, where the temperature of the second temperature regulating medium is higher than the fourth temperature threshold, and the fourth temperature threshold is higher than the second temperature threshold.
[0107] If the second temperature information is less than the second temperature threshold and the first temperature information is greater than the fourth temperature threshold (i.e., Ta < T2, Ta > T4), then the selection flow section is controlled to send the second temperature regulating medium into the second temperature regulating section and refuse to send the second temperature regulating medium into the first temperature regulating section, i.e., enter mode 3.
[0108] Wherein, the temperature of the first temperature regulating medium is lower than the first temperature threshold; the temperature of the second temperature regulating medium is higher than the second temperature threshold; and the temperature of the second temperature regulating medium is lower than the temperature of the first temperature regulating medium.
[0109] In the above scheme, through simple control logic and combined with liquid cooling plates arranged in parallel on the upper and lower end faces, different cooling schemes are provided for the upper and lower end faces of the battery for different operating conditions, which can keep the battery in the optimal operating temperature range and effectively improve the battery's cycle life.
[0110] In some examples, if both the first temperature information and the second temperature information are less than the third temperature threshold and both are greater than the fourth temperature threshold, then the selection flow unit is controlled to refuse to send the corresponding temperature-regulating medium into the first temperature-regulating unit and the second temperature-regulating unit.
[0111] That is, when T4 < T<T3 and T4 < T<T3, enter mode 4.
[0112] The first temperature threshold T1 is in the range of 35 degrees Celsius to 45 degrees Celsius, for example, it can be 40 degrees Celsius, and the second temperature threshold T2 is in the range of -2 degrees Celsius to -12 degrees Celsius, for example, it can be -7 degrees Celsius.
[0113] Corresponding to the first temperature threshold T1 and the second temperature threshold T2, if T1 = 40℃, then T3 can be 38℃; if T2 = -7℃, then T4 can be -5℃.
[0114] One specific implementation method, combined with Figure 8 Then we have:
[0115] When T_lower > 40℃ and T_upper > 40℃ (i.e., T_upper > T1 and T_lower > T1), the battery cooling system is in cooling cycle, and the first liquid cooling plate 101 and the second liquid cooling plate 201 work simultaneously to quickly cool the battery. At this time, it is in mode 1.
[0116] When Tlow > 40℃ and Tup < 38℃ (i.e., Tup < T3, Tlow > T1), the battery cooling system is in cooling cycle, the first liquid cooling plate 101 is working, and the second liquid cooling plate 201 is not working. This is mode 2, where the system cools the lower surface of the battery independently and quickly balances the battery temperature difference.
[0117] When Tlow < 38℃ and Tup > 40℃ (i.e., Tlow < T3 and Tup > T1), the battery cooling system is in cooling cycle. The first liquid cooling plate 101 is not working, and the second liquid cooling plate 201 is working. At this time, it is in mode 3. The system cools the upper surface of the battery separately and quickly balances the battery temperature difference.
[0118] When T_lower < 38℃ and T_upper < 38℃ (i.e., T_lower < T3 and T_upper < T3), the battery cooling system is in cooling cycle, but the first liquid cooling plate 101 and the second liquid cooling plate 201 are not working, and the cooling system is in a silent standby state, which is mode 4.
[0119] When a vehicle is in a low-temperature environment, then:
[0120] When T_low > -5℃ and T_up > -5℃ (i.e., T_low > T4 and T_up > T4), the battery cooling system is in cooling cycle, but the first liquid cooling plate 101 and the second liquid cooling plate 201 are not working, and the cooling system is in a silent standby state, which is in mode 4.
[0121] When T_lower > -5℃ and T_upper < -7℃ (i.e., T_lower > T4 and T_upper < T2), the battery cooling system is in heating cycle. The first liquid cooling plate 101 is not working, and the second liquid cooling plate 201 is working. At this time, it is in mode 3. The system heats the upper part of the battery separately and quickly balances the battery temperature difference.
[0122] When T_lower < -7℃ and T_upper > -5℃ (i.e., T_lower < T2 and T_upper > T4), the battery cooling system is in heating cycle, the first liquid cooling plate 101 is working, and the second liquid cooling plate 201 is not working. At this time, it is in mode 2, where the system heats the lower end of the battery separately and quickly balances the battery temperature difference.
[0123] When Tlow < -7℃ and Tup < -7℃ (i.e., Tlow < T2 and Tup < T2), the battery cooling system is in heating cycle, and the first liquid cooling plate 101 and the second liquid cooling plate 201 work simultaneously. At this time, it is in mode 1, which rapidly heats the battery so that it can enter the optimal operating temperature range as soon as possible.
[0124] This invention provides an electric vehicle including the battery assembly mentioned above.
[0125] In the description of this specification, the references to terms such as "an embodiment," "an example," "a specific implementation process," and "an example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0126] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions 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 power battery temperature regulation system for an electric vehicle, characterized in that, include: The temperature-regulating medium includes an inlet pipeline, an outlet pipeline, a first temperature-regulating section, a second temperature-regulating section, a flow selection section, and a control device. The inlet pipeline is connected to the medium inlet of the first temperature-regulating unit and the medium inlet of the second temperature-regulating unit via the selective flow section. The medium outlet of the first temperature-regulating unit and the medium outlet of the second temperature-regulating unit are directly or indirectly connected to the outlet pipeline. The selective flow section can selectively send the temperature-regulating medium into the first temperature-regulating unit and / or the second temperature-regulating unit under the control of the control device. The first temperature regulating unit is disposed on the lower side of the battery to regulate the temperature of the lower side of the battery through the temperature regulating medium entering the first temperature regulating unit; the second temperature regulating unit is disposed on the upper side of the battery to regulate the temperature of the upper side of the battery through the temperature regulating medium entering the second temperature regulating unit. The control device is used for: Acquire first temperature information and second temperature information; the first temperature information represents the temperature of the lower side of the battery, and the second temperature information represents the temperature of the upper side of the battery; By controlling the selected flow section, the first temperature information and the second temperature information are adjusted to meet preset requirements.
2. The power battery temperature regulation system according to claim 1, characterized in that, When the control device adjusts the first temperature information and the second temperature information to meet preset requirements by controlling the selected flow section, it is specifically used for: If both the first temperature information and the second temperature information are greater than the preset first temperature threshold, then the selection flow section is controlled to send the first temperature regulating medium for cooling into the first temperature regulating section and the second temperature regulating section, and the temperature of the first temperature regulating medium is lower than the first temperature threshold. If both the first temperature information and the second temperature information are less than a preset second temperature threshold, then the selection flow section is controlled to send the second temperature regulating medium for heating into the first temperature regulating section and the second temperature regulating section. The temperature of the second temperature regulating medium is higher than the second temperature threshold, and the temperature of the second temperature regulating medium is lower than the temperature of the first temperature regulating medium.
3. The power battery temperature regulation system according to claim 2, characterized in that, If the first temperature information is greater than the first temperature threshold and the second temperature information is less than the preset third temperature threshold, then the selected flow section is controlled to send the first temperature regulating medium into the first temperature regulating section and refuse to send the first temperature regulating medium into the second temperature regulating section. The temperature of the first temperature regulating medium is lower than the third temperature threshold and the third temperature threshold is lower than the first temperature threshold. If the second temperature information is greater than the first temperature threshold and the first temperature information is less than the third temperature threshold, then the selected flow section is controlled to send the first temperature regulating medium into the second temperature regulating section and refuse to send the first temperature regulating medium into the first temperature regulating section. If the first temperature information is less than a preset second temperature threshold and the second temperature information is greater than a preset fourth temperature threshold, then the selected flow section is controlled to send the second temperature regulating medium into the first temperature regulating section and refuse to send the second temperature regulating medium into the second temperature regulating section. The temperature of the second temperature regulating medium is higher than the fourth temperature threshold and the fourth temperature threshold is higher than the second temperature threshold. If the second temperature information is less than the second temperature threshold and the first temperature information is greater than the fourth temperature threshold, then the selected flow section is controlled to send the second temperature regulating medium into the second temperature regulating section and refuse to send the second temperature regulating medium into the first temperature regulating section. Wherein, the temperature of the first temperature regulating medium is lower than the first temperature threshold; the temperature of the second temperature regulating medium is higher than the second temperature threshold; and the temperature of the second temperature regulating medium is lower than the temperature of the first temperature regulating medium.
4. The power battery temperature regulation system according to claim 3, characterized in that, If both the first temperature information and the second temperature information are less than the third temperature threshold and both are greater than the fourth temperature threshold, then the selected flow section is controlled to refuse to send the corresponding temperature-regulating medium into the first temperature-regulating section and the second temperature-regulating section.
5. The power battery temperature regulation system according to any one of claims 2 to 4, characterized in that, The first temperature threshold is in the range of 35 degrees Celsius to 45 degrees Celsius, and the second temperature threshold is in the range of -2 degrees Celsius to -12 degrees Celsius.
6. The power battery temperature regulation system according to any one of claims 1 to 4, characterized in that, The first temperature regulating unit includes at least one first liquid cooling plate; the second temperature regulating unit includes at least one second liquid cooling plate. If there are multiple first liquid cooling plates, then the multiple first liquid cooling plates are connected in series; If there are multiple second liquid cooling plates, then the multiple second liquid cooling plates are connected in series.
7. The power battery temperature regulation system according to any one of claims 1 to 4, characterized in that, The selected flow section includes an electrically controlled three-way valve controlled by the control device.
8. The power battery temperature regulation system according to any one of claims 1 to 4, characterized in that, The medium outlet of the first temperature regulating unit is connected to the discharge pipeline via a three-way connector and a first one-way valve; the medium outlet of the first temperature regulating unit is connected to the discharge pipeline via a three-way connector and a second one-way valve.
9. A battery assembly for an electric vehicle, characterized in that, It includes the power battery temperature regulation system as described in any one of claims 1 to 8, the battery, and the lower housing; the battery is disposed in the lower housing.
10. An electric vehicle, characterized in that, Includes the battery assembly as described in claim 9.