Battery assembly and temperature control method therefor, electric system and controller

Abstract

A battery assembly and a temperature control method therefor, an electric system and a controller. The battery assembly comprises a battery and a temperature regulating assembly, wherein the temperature regulating assembly is arranged on one side of the battery to exchange heat with the battery, the temperature regulating assembly is provided with a liquid flow plate which is provided with a liquid flow channel, and the liquid flow channel is provided with liquid inlets and a liquid outlet. The temperature control method comprises: acquiring a maximum value tmax and a minimum value tmin of the temperature of a battery; acquiring a difference △t of the maximum value tmax and the minimum value tmin; and when the difference △t is greater than a first threshold △t0, controlling a temperature regulating assembly to be in an on state, and controlling the liquid inlet temperature tb of a liquid flow plate to meet: tmin<tb<tmax.

Description

Battery assembly, temperature control method thereof, power system and controller

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on December 25, 2023, with application number 202311800520.6 and titled “Battery assembly and its temperature control method, power system and controller,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present disclosure relates to the field of battery technology, and in particular, to a battery assembly and a temperature control method thereof, a power system, and a controller. Background Art

[0004] During the operation of a battery module, as the temperature continues to drop, the ohmic internal resistance and polarization internal resistance of the battery module increase to varying degrees, and the overall discharge voltage of the battery module is lower than that at room temperature. During charging and discharging under low-temperature conditions, the operating voltage rises or falls faster than at room temperature, resulting in a significant reduction in its maximum usable capacity and power. Therefore, operating a battery module at low temperatures will lead to a decrease in its operating performance. Prolonged exposure to low-temperature conditions will also shorten the battery module's lifespan and even affect the safety of the battery module.

[0005] Summary of the Invention

[0006] The purpose of the present disclosure is to provide a battery assembly and a temperature control method thereof, a power system and a controller, so as to at least partially solve the problems existing in the related art.

[0007] To achieve the above objectives, the present disclosure provides a temperature control method for a battery assembly, the battery assembly comprising a battery and a temperature control assembly, the temperature control assembly being disposed on one side of the battery to perform heat exchange with the battery, the temperature control assembly comprising a liquid flow plate, the liquid flow plate being provided with a liquid flow channel for accommodating a liquid, the liquid flow channel being provided with a liquid inlet and a liquid outlet;

[0008] The temperature control method comprises:

[0009] Get the maximum value t of the battery temperature max and minimum value t min ;

[0010] Get the maximum value t max and the minimum value t min The difference △t;

[0011] When the difference Δt is greater than the first threshold Δt0, the temperature regulating component is controlled to be in the open state, and the inlet temperature of the liquid flow plate is controlled to be t b Satisfaction: tmin <t b <t max , to adjust the temperature of the battery.

[0012] Optionally, in the control of the temperature regulating component being in an open state and controlling the liquid inlet temperature t of the liquid flow plate b Satisfaction: t min <t b <t max , in the step of adjusting the temperature of the battery, the temperature control method includes:

[0013] Control the cooling liquid to enter the liquid flow plate, the liquid inlet temperature of the liquid flow plate is t b Satisfaction: t b =t min +(t max -t min )*α or t b =t max -(t max -t min )*α, where 0.2≤α≤0.8.

[0014] Optionally, the battery includes a first temperature zone and a second temperature zone, the liquid flow plate has a first flow channel opening and a second flow channel opening, the first flow channel opening is set corresponding to the first temperature zone, and the second flow channel opening is set corresponding to the second temperature zone, wherein the temperature of the first temperature zone is greater than the temperature of the second temperature zone, and when the cooling liquid enters the liquid flow plate, the liquid inlet temperature t b Satisfaction: t b =t min +(t max -t min )*α or t b =t max -(t max -t min )*α, wherein, in the step of 0.2≤α≤0.8, the temperature control method includes:

[0015] Control the coolant to enter from the first flow channel and control the liquid inlet temperature t of the liquid flow plate b Satisfaction: t b =t max -(t max -t min )*α; or

[0016] Control the coolant to enter from the second flow channel and control the liquid inlet temperature t of the liquid flow plate b Satisfaction: t b =t min +(t max -tmin )*α.

[0017] Optionally, in obtaining the maximum value t of the battery temperature max and minimum value t min In the step, the temperature control method includes:

[0018] The maximum value t obtained max is the maximum value of the temperature in the first temperature zone, and the minimum value t min is the minimum value of the temperature in the second temperature zone.

[0019] Optionally, the temperature control method includes:

[0020] The temperature is greater than the second threshold t q The number of detection points a and the temperature are less than the third threshold t p The number of detection points b is used to obtain the value of α, where the size of α is negatively correlated with the value of ab.

[0021] Optionally, the temperature control method includes:

[0022] In obtaining the maximum value t max and the minimum value t min Before the step of the difference △t, compare the minimum value t min With the fourth threshold t z , if the minimum value t min Greater than the fourth threshold t z , control the temperature control component to be in the closed state, if the minimum value t min Less than or equal to the fourth threshold t z , execute the method to obtain the maximum value t max and the minimum value t min The difference △t steps.

[0023] According to a second aspect of the present disclosure, a controller is provided, which is used to implement the above-mentioned temperature control method of the battery assembly to regulate the liquid inlet temperature of the liquid flow plate.

[0024] According to a third aspect of the present disclosure, a battery assembly is provided, wherein the battery assembly uses the above-mentioned temperature control method for a battery assembly, and the battery assembly includes:

[0025] Batteries, and

[0026] A temperature regulating component is arranged on one side of the battery to perform heat exchange with the battery. The temperature regulating component has a liquid flow plate, the liquid flow plate is provided with a liquid flow channel for accommodating liquid, and the liquid flow channel is provided with a liquid inlet and a liquid outlet.

[0027] Optionally, the battery includes a first temperature zone and a second temperature zone.

[0028] Optionally, the battery includes a battery cell having a main body and a pole located at the end of the main body in the longitudinal direction, the first temperature zone is located at the pole, and the second temperature zone is located at the main body. The battery assembly also includes a plurality of temperature detection elements, which are respectively arranged on the pole and the main body.

[0029] Optionally, the battery includes a plurality of battery cells, the plurality of battery cells are arranged in the width direction, and the plurality of temperature detection elements are arranged at least on the main body of the battery cells at the end and on the pole of at least one of the battery cells.

[0030] Optionally, the liquid flow channel includes a first flow channel area and a second flow channel area that are interconnected, the first flow channel area includes a plurality of first flow channels that are interconnected, the second flow channel area includes a plurality of second flow channels that are interconnected, the first flow channel is connected to the liquid inlet, and the second flow channel is connected to the liquid outlet, and the extension direction of the first flow channel and the second flow channel is the same as the width direction of the battery.

[0031] Optionally, the first flow channels are respectively arranged at positions close to the poles, and the second flow channels are respectively arranged at positions away from the poles.

[0032] Optionally, a flow channel exchange portion is connected between the first flow channel and the second flow channel, and the flow channel exchange portion includes a plurality of protrusions arranged at intervals, which is used to merge and then divert the liquids in the plurality of first flow channels.

[0033] Optionally, the temperature regulating component includes a heating film provided at least at one end in the height direction of the battery, and the heating film is in contact with the battery.

[0034] Optionally, the heating film includes a plurality of independent film units.

[0035] Optionally, the battery assembly is a self-heating battery.

[0036] According to a fourth aspect of the present disclosure, there is provided an electricity system comprising the above-mentioned battery assembly.

[0037] Through the above technical solution, the temperature adjustment component can adjust the temperature according to the maximum value of the battery t max and minimum value t min The temperature of the battery components can be adjusted in time according to the temperature difference. While increasing the temperature rise rate of the battery and reducing energy consumption, the temperature of the battery components can be maintained to ensure the working performance of the battery components and improve the safety of the battery components.

[0038] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0040] FIG1 is a schematic diagram of a battery assembly according to one embodiment of the present disclosure.

[0041] FIG2 is a schematic diagram of a battery of a battery assembly according to an embodiment of the present disclosure.

[0042] FIG3 is a schematic diagram of a liquid flow plate of a battery assembly according to an embodiment of the present disclosure.

[0043] FIG4 is a schematic diagram of a heating film of a battery assembly according to an embodiment of the present disclosure.

[0044] FIG5 is a schematic diagram of an electric power system according to an embodiment of the present disclosure.

[0045] FIG6 is a flow chart of a temperature control method for a battery assembly according to an embodiment of the present disclosure.

[0046] FIG7 is a flow chart of a temperature control method for a battery assembly according to another embodiment of the present disclosure.

[0047] Explanation of the reference numerals 1-battery assembly; 11-battery; 1101-first temperature zone; 1102-second temperature zone; 111-pole; 112-main body; 113-battery cell; 12-temperature detection element; 2-liquid flow plate; 21-liquid flow channel; 2101-first flow channel opening; 2102-second flow channel opening; 2103-first flow channel area; 2104-second flow channel area; 211-liquid inlet; 212-liquid outlet; 213-first flow channel; 214-second flow channel; 215-protrusion; 216-flow channel exchange part; 3-heating film; 31-diaphragm unit; 4-temperature control component; 5-controller; 6-power system. DETAILED DESCRIPTION

[0048] The following describes the specific embodiments of the present disclosure in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present disclosure.

[0049] In this disclosure, unless otherwise stated, directional terms such as "upper" and "lower" are defined based on the actual layout of the battery assembly, and directional terms such as "inner" and "outer" are defined with respect to the outlines of the corresponding components. The use of terms such as "first" and "second" is intended to distinguish different components and does not have a sequential or important nature. In addition, in the following description, when referring to the drawings, unless otherwise explained, the same reference numerals in different drawings represent the same or similar elements.

[0050] According to one embodiment of the present disclosure, a battery assembly 1 is provided, including a battery 11 and a temperature control assembly 4, wherein the temperature control assembly 4 is arranged on one side of the battery 11 to perform heat exchange with the battery 11, and the temperature control assembly 4 has a liquid flow plate 2, the liquid flow plate 2 is provided with a liquid flow channel 21 for accommodating liquid, and the liquid flow channel 21 is provided with a liquid inlet 211 and a liquid outlet 212.

[0051] Through the above technical solution, the temperature adjustment component 4 can adjust the temperature according to the maximum value t of the battery 11. max and minimum value t min The temperature of the battery assembly 1 can be adjusted in time according to the temperature difference. While increasing the temperature rise rate of the battery 11 and reducing energy consumption, the working performance of the battery assembly 1 can be ensured by maintaining the temperature of the battery assembly 1, thereby improving the safety of the battery assembly 1.

[0052] Furthermore, the battery 11 may include a first temperature zone 1101 and a second temperature zone 1102. The temperature of the first temperature zone 1101 may be greater than the temperature of the second temperature zone 1102, or may be partially greater than the temperature of the second temperature zone 1102. This is not limited in the present disclosure. The battery 11 may include a cell 113. The cell 113 may have a main body 112 and a pole 111 located at an end of the main body 112 in a degree direction. For example, if the temperature of the first temperature zone 1101 is greater than the temperature of the second temperature zone 1102, the first temperature zone 1101 may be located at the pole 111, and the second temperature zone 1102 may be located at the main body 112. The battery assembly 1 may also include a plurality of temperature detection elements 12, which are respectively arranged on the pole 111 and the main body 112, so as to collect temperature data from different positions of the battery 11 at multiple points and multiple partitions, thereby improving the accuracy of temperature collection, so that the temperature control component 4 can adjust the temperature of the battery 11 in a timely manner to ensure the working performance and safety of the battery assembly 1.

[0053] Furthermore, as shown in FIG1 and FIG2 , the battery 11 may include a plurality of battery cells 113 , and the plurality of battery cells 113 are arranged in the width direction. The battery 11 is formed by the plurality of battery cells 113 , and the temperatures of the plurality of battery cells 113 at the same position in the arrangement direction of the battery cells 113 are relatively close. Therefore, the plurality of temperature detection elements 12 may be arranged at least on the main body 112 of the battery cell 113 at the end, and on the pole 111 of at least one battery cell 113 . This allows for multi-point and multi-partition collection of data at different positions of the battery assembly 1 , thereby improving the accuracy of temperature collection and enabling the temperature control component 4 to adjust the temperature of the battery assembly 1 in a timely manner, thereby ensuring the working performance and safety of the battery assembly 1 . In addition, in other embodiments, the plurality of temperature detection elements 12 may be arranged on the pole 111 side of the battery 11 and in the middle of the battery 11 .

[0054] According to one embodiment of the present disclosure, as shown in Figures 1 and 2 , each battery cell 113 extends lengthwise, with poles 111 located at both ends of the battery cell 113 along the lengthwise direction. The middle portions of the multiple battery cells 113 are arranged along the widthwise direction to form the middle portion of the battery 11, thereby forming a first temperature zone 1101 and a second temperature zone 1102 of the battery 11.

[0055] According to one embodiment of the present disclosure, as shown in Figures 1 and 3, the liquid flow plate 2 can be set at least at one end in the height direction of the battery 11, and the liquid flow plate 2 can be sealed and attached to the outer wall of the battery 11 and a liquid flow channel 21 for accommodating liquid is formed between the liquid flow plate 2 and the battery 11. The liquid flow channel 21 that is not in direct contact with the battery 11 can also be directly formed on the liquid flow plate 2 itself, and the present disclosure does not limit this. The liquid flow channel 21 can be set as a straight flow channel or a serpentine flow channel, and the present disclosure does not limit this. The liquid inlet 211 and the liquid outlet 212 can be set on the same side or on opposite sides, and the present disclosure also does not limit this.

[0056] Furthermore, the liquid flow plate 2 has a first flow channel opening 2101 and a second flow channel opening 2102. The first flow channel opening 2101 is configured to correspond to the first temperature zone 1101, and the second flow channel opening 2102 is configured to correspond to the second temperature zone 1102. Based on specific liquid flow requirements, liquid can enter from the first flow channel opening 2101 and exit from the second flow channel opening 2102. In this case, the first flow channel opening 2101 serves as the liquid inlet 211 of the liquid flow plate 2, and the second flow channel opening 2102 serves as the liquid outlet 212 of the liquid flow plate 2. Furthermore, liquid can enter from the second flow channel opening 2102 and exit from the first flow channel opening 2101. In this case, the first flow channel opening 2101 serves as the liquid outlet 212 of the liquid flow plate 2, and the second flow channel opening 2102 serves as the liquid inlet 211 of the liquid flow plate 2.

[0057] Further, as shown in Figures 1 and 3, the liquid flow channel 21 may include a first flow channel area 2103 and a second flow channel area 2104 that are interconnected. The first flow channel area 2103 may include multiple first flow channels 213 that are interconnected, and the second flow channel area 2104 may include multiple second flow channels 214 that are interconnected, wherein the first flow channel 213 is connected to the liquid inlet 211, and the second flow channel 214 is connected to the liquid outlet 212. The extension direction of the first flow channel 213 and the second flow channel 214 is the same as the width direction of the battery 11. In this way, the liquid in each first flow channel 213 and the second flow channel 214 can flow through multiple battery cells 113. When the temperature of the battery 11 is uneven, the liquid absorbs heat when flowing through the high-temperature part and dissipates heat when flowing through the low-temperature part. During the flow process, the heat of the high-temperature part of the battery 11 area is brought to the low-temperature part of the battery 11 area, which helps to average the temperature of the battery 11. In addition, since the locations through which multiple first flow channels 213 flow may have different temperatures, this will cause uneven temperatures between the multiple first flow channels 213. A flow channel exchange portion 216 may also be connected between the first flow channel 213 and the second flow channel 214. The flow channel exchange portion 216 includes a plurality of spaced protrusions 215, which are used to converge and then divert the liquids in the multiple first flow channels 213 to achieve the purpose of averaging the liquid temperatures after passing through different first flow channels 213. The liquid with averaged temperature is then diverted to the second flow channel 214, thereby maximizing the uniformity of the liquid temperatures at the entrances of the multiple second flow channels 214, thereby further averaging the liquid temperature and thus achieving the purpose of reducing the temperature difference of the battery components.

[0058] Furthermore, because the temperature at the terminal 111 is generally higher than the temperature in the middle of the battery 11, the first flow channel 213 can be located near the terminal 111, and the second flow channel 214 can be located away from the terminal 111. The first flow channel 213 first flows through the terminal 111 and absorbs heat, and then flows into the second flow channel 214 and releases heat, thereby reducing the temperature at the terminal 111 and increasing the temperature in the middle of the battery 11.

[0059] According to another embodiment of the present disclosure, as shown in FIG4 , the temperature control component 4 may also include a heating film 3 provided at least at one end in the height direction of the battery 11, and the heating film 3 is in contact with the battery 11. When the temperature difference of the battery 11 is too large, the heating film 3 can be turned on to heat the battery 11 to increase the temperature of the battery assembly 1. The heating film 3 may also include a plurality of independent diaphragm units 31. When the temperature difference of the battery assembly 1 is too large, the diaphragm units 31 in the low temperature area can be heated separately, thereby heating the low temperature area while ensuring the temperature of the high temperature area, thereby achieving precise control of the temperature difference of the battery assembly 1 and reducing the impact of the temperature control on the high temperature area.

[0060] It should be noted that the battery assembly 1 may also be a self-heating battery. When the overall temperature of the battery assembly 1 is too low, self-heating may be started first to increase the overall temperature of the battery assembly 1 .

[0061] Based on the above solution, referring to FIG. 5 , the present disclosure further provides an electric system 6, which includes the above battery assembly 1 and has all the beneficial effects of the above battery assembly 1, which will not be described in detail here.

[0062] Due to the structural characteristics of the battery assembly 1 itself, during the self-heating and charging and discharging process, the current density near the pole 111 is greater than that in other areas, and the temperature rise rate near the pole 111 is significantly higher than that of the main part of the battery assembly 1. As a result, during the self-heating or charging and discharging process, the temperature near the pole 111 at both ends of the battery 11 is high, and the temperature of the main part in the middle is low. Both the temperature rise rate and temperature uniformity need to be improved.

[0063] Specifically, in order to solve the problem of large temperature difference of the battery assembly 1 caused by self-heating or charging and discharging of the battery assembly 1, a temperature control method of the battery assembly 1 is provided. As shown in FIG6 , the above-mentioned battery assembly 1 can use the following temperature control method, which includes step 501, that is, obtaining the maximum temperature t of the battery 11 max and minimum value t min , where the maximum value t max and minimum value t min It can be obtained by collecting the real-time temperatures of multiple temperature detection elements 12 and summarizing them. After the real-time temperatures of multiple temperature detection elements 12 are counted, two extreme values ​​are obtained, and then step 502 is executed to obtain the maximum value t max and minimum value t min The control part of the battery assembly 1 can first preset a first threshold value △t0. After obtaining the difference △t, step 503 is executed. When the difference △t is greater than the first threshold value △t0, the temperature adjustment component 4 is controlled to be in the on state to adjust the temperature of the battery 11. By maintaining the temperature of the battery assembly 1, the working performance of the battery assembly 1 is ensured and the safety of the battery assembly 1 is improved. In the process of adjusting the temperature, the temperatures of multiple temperature detection elements 12 can be detected in real time and the maximum value t can be counted in real time. max and minimum value t min When the difference Δt between the two is less than or equal to the first threshold Δt0, the temperature control component 4 can be controlled to be closed. max and minimum value t min In the acquisition of the maximum value t max The maximum value of the temperature in the first temperature zone 1101 mentioned below, the minimum value t minIt may be the minimum value of the temperature in the second temperature zone 1102 mentioned below, which is not limited in the present disclosure.

[0064] Furthermore, as shown in FIG7 , when the temperature regulating component 4 includes the liquid flow plate 2 mentioned above, in the step of controlling the temperature regulating component 4 to be in an on state to heat the battery 11, the temperature control method may further include step 602, that is, when the difference Δt difference Δt is greater than the first threshold Δt0, controlling the temperature regulating component 4 to be in an on state, and simultaneously controlling the liquid inlet temperature t of the liquid flow plate 2 to be equal to the liquid inlet temperature t b Satisfaction: t min <t b <t max , to adjust the temperature of battery 11. In this way, the liquid in flow plate 2 absorbs heat from battery assembly 1 in its high-temperature areas and releases heat to battery assembly 1 in its low-temperature areas. This lowers the temperature in the high-temperature areas and raises the temperature in the low-temperature areas, thus reducing the temperature differential within battery assembly 1 from two perspectives. Because the temperature rise rate is determined by the area with the lowest temperature rise, the temperature rise rate of battery 11 will also increase significantly, shortening the control time.

[0065] When the temperature control component 4 is in the open state and the inlet temperature of the liquid flow plate 2 is controlled, b Satisfaction: t min <t b <t max In the step of regulating the temperature of the battery 11, the temperature control method may further include controlling the coolant to enter the liquid flow plate 2 to adjust the temperature of the battery 11. At this time, the liquid inlet temperature t b Can satisfy: t b =t min +(t max -t min )*α or t b =t max -(t max -t min )*α, wherein 0.2≤α≤0.8, so that the liquid inlet temperature is between the maximum value and the minimum value, thereby more accurately regulating the liquid inlet temperature of the liquid flow plate 2 to shorten the overall regulation time.

[0066] Here, in the solution where the battery 11 includes a first temperature zone 1101 and a second temperature zone 1102, the temperature of the first temperature zone 1101 may be greater than the temperature of the second temperature zone 1102. When controlling the coolant to enter the liquid flow plate 2, the liquid inlet temperature t of the liquid flow plate 2 is b Satisfaction: t b =t min +(t max -t min )*α or t b =t max-(t max -t min )*α, wherein 0.2≤α≤0.8, the temperature control method may further include: controlling the coolant to enter from the first flow channel 2101, and controlling the liquid inlet temperature t of the liquid flow plate 2 b Satisfaction: t b =t max -(t max -t min )*α, that is, the cooling liquid is controlled to enter the liquid flow plate 2 from the liquid inlet 211 of the liquid flow plate 2 corresponding to the first temperature zone 1101, and the inlet temperature of the liquid flow plate 2 is t b Satisfaction: t b =t max -(t max -t min )*α, at this time, the liquid flow plate 2 can be discharged from the liquid outlet 212 of the liquid flow plate 2 corresponding to the second temperature zone 1102; or the cooling liquid can be controlled to enter from the second flow channel 2102 and the liquid inlet temperature t of the liquid flow plate 2 can be controlled. b Satisfaction: t b =t min +(t max -t min )*α, that is, the cooling liquid is controlled to enter the liquid flow plate 2 from the liquid inlet of the liquid flow plate 2 corresponding to the second temperature zone 1102, and the inlet temperature of the liquid flow plate 2 is t b Satisfaction: t b =t min +(t max -t min )*α, at this time, the liquid can flow out of the liquid flow plate 2 from the liquid outlet 212 of the liquid flow plate 2 corresponding to the first temperature zone 1101, so as to realize the circulation of the coolant in the liquid flow plate 2, thereby improving the temperature uniformity of the battery.

[0067] Specifically, when the first temperature zone 1101 is located at the pole 111, the second temperature zone 1102 is located at the main body 112, and the liquid flow plate 2 includes a first flow channel 213 and a second flow channel 214, the first flow channel 213 corresponds to the first temperature zone 1101, and the second flow channel 214 corresponds to the second temperature zone 1102, the coolant can be controlled to enter the liquid flow plate 2 from the first flow channel 213 and flow out of the liquid flow plate 2 from the second flow channel 214. At this time, the inlet liquid temperature t b Satisfy the formula t b =t min +(t max -t min )*α, since the temperature value of the high temperature zone (the first temperature zone 1101) is different from t bThe temperature difference is large, so the heat exchange between the battery part corresponding to the high temperature zone (first temperature zone 1101) and the coolant in the flow channel can be accelerated, thereby increasing the cooling rate of the high temperature zone to shorten the temperature difference with the low temperature zone (second temperature zone 1102), and further shortening the temperature averaging time of the low temperature zone and the high temperature zone of the battery. Alternatively, the coolant is controlled to enter the liquid flow plate 2 from the second flow channel 214 and flow out of the liquid flow plate 2 from the first flow channel 213, and the inlet temperature t b Satisfy the formula t b =t max -(t max -t min )*α, since the temperature value of the low temperature zone (the second temperature zone 1102) is different from t b The temperature difference is large, which can accelerate heat exchange between the battery portion corresponding to the low-temperature zone (second temperature zone 1102) and the coolant in the flow channel, thereby increasing the heating rate of the low-temperature zone to shorten the temperature difference with the high-temperature zone (first temperature zone 1101), further shortening the temperature averaging time between the low-temperature and high-temperature zones of the battery. Wherein, 0.2≤α≤0.8, which is not limited in this disclosure.

[0068] It should be noted that the second threshold t can be set q and the third threshold t p , the second threshold t q Greater than the third threshold t p , where the temperature is higher than the second threshold t q The high temperature area is below the third threshold value t p The low temperature area can be obtained, and the temperature is greater than the second threshold t q The number of detection points a and the temperature are less than the third threshold t p The number of detection points b is used to obtain the value of α, where the size of α is negatively correlated with the value of ab. The negative correlation here means that the larger the value of ab, that is, the more high-temperature zones and the fewer low-temperature zones there are in the battery assembly 1. In this case, the smaller the value of α is, the more it deviates towards 0.2. The smaller the value of ab, that is, the fewer high-temperature zones and the more low-temperature zones there are in the battery assembly 1. In this case, the larger the value of α is, the more it deviates towards 0.8. The setting of this formula can further improve the efficiency of balancing the temperature difference of the battery assembly 1, that is, the value of α can be determined based on the area of ​​the low-temperature zone and the area of ​​the entire temperature zone. In order to shorten the time for equalization, the value of α is adjusted according to the area ratio of the high and low temperature zones, ensuring the accuracy of temperature control, so as to reduce the temperature difference between the temperature of the low-temperature zone and the temperature of the high-temperature zone and the equilibrium temperature as soon as possible, thereby shortening the time for equalization. The relevant formula for the value of α can be set in real time according to actual conditions, or multiple values ​​can be taken at intervals within the range of 0.2 to 0.8, each value corresponding to a different range of the value of ab. This disclosure is not limited to this.

[0069] According to an embodiment of the present disclosure, when executing the method to obtain the maximum value t max and minimum value t min Before the step of comparing the difference △t, as shown in FIG7 , step 601 can be performed first to compare the minimum value t min With the fourth threshold t z , if the minimum value t min Greater than the fourth threshold t z , then the temperature of the battery assembly 1 is not in the low temperature zone that affects the performance of the battery assembly 1, and there is no need to heat the battery assembly 1 additionally. Step 603 can be executed to control the temperature regulating component 4 to be in the off state to save energy. min Less than or equal to the fourth threshold t z , then execute step 502, i.e. obtain the maximum value t max and minimum value t min The difference △t steps.

[0070] On the basis of the above solution, the present disclosure further provides a controller 5, which is used to implement the steps of the above temperature control method of the battery assembly 1 to regulate the liquid inlet temperature of the liquid flow plate 2, which will not be repeated here.

[0071] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the scope of protection of the present disclosure.

[0072] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0073] In addition, the various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A temperature control method for a battery assembly (1), characterized in that, The battery assembly (1) includes a battery (11) and a temperature control assembly (4). The temperature control assembly (4) is disposed on one side of the battery (11) to perform heat exchange with the battery (11). The temperature control assembly (4) has a liquid flow plate (2), and the liquid flow plate (2) is provided with a liquid flow channel (21) for accommodating liquid. The liquid flow channel (21) is provided with a liquid inlet (211) and a liquid outlet (212). The temperature control method includes: Obtain the maximum value t of the temperature of the battery (11) max and the minimum value t min ; Obtain the difference Δt between the maximum value t max and the minimum value t min ; When the difference Δt is greater than the first threshold value Δt0, control the temperature regulating component (4) to be in an open state, and control the inlet liquid temperature t of the liquid flow plate (2) b to satisfy: t min < t b < t max , so as to adjust the temperature of the battery (11).

2. The temperature control method of the battery assembly (1) according to claim 1, characterized in that, While controlling the temperature adjustment component (4) to be in an on state and controlling the inlet liquid temperature t of the liquid flow plate (2) b satisfies: t min < t b < t max , in the step of adjusting the temperature of the battery (11), the temperature control method includes: Control the coolant to enter the liquid flow plate (2), and the inlet temperature t of the liquid flow plate (2) b satisfies: t b = t min +(t max - t min ) * α or t b = t max -(t max - t min ) * α, where 0.2 ≤ α ≤ 0.

8.

3. The temperature control method of the battery assembly (1) according to claim 2, characterized in that, The battery (11) includes a first temperature zone (1101) and a second temperature zone (1102). The liquid flow plate (2) has a first flow port (2101) and a second flow port (2102). The first flow port (2101) is correspondingly arranged with the first temperature zone (1101), and the second flow port (2102) is correspondingly arranged with the second temperature zone (1102). Wherein, the temperature of the first temperature zone (1101) is greater than the temperature of the second temperature zone (1102). When controlling the coolant to enter the liquid flow plate (2), the inlet temperature t of the liquid flow plate (2) b satisfies: t b = t min +(t max - t min ) * α or t b = t max -(t max - t min ) * α, where 0.2 ≤ α ≤ 0.

8. In the step, the temperature control method includes: Control the coolant to enter from the first fluid outlet (2101), and control the inlet temperature t of the fluid flow plate (2) b Satisfy: t b = t max -(t max - t min ) * α; or Control the coolant to enter from the second fluid outlet (2102), and control the inlet temperature t of the fluid flow plate (2) b Satisfy: t b = t min +(t max - t min ) * α.

4. The temperature control method of the battery assembly (1) according to claim 3, characterized in that, In the step of obtaining the maximum value t max and the minimum value t min of the temperature of the battery (11), the temperature control method includes: The obtained maximum value t max is the maximum value of the temperature in the first temperature zone (1101), and the obtained minimum value t min is the minimum value of the temperature in the second temperature zone (1102).

5. The temperature control method of the battery assembly (1) according to any one of claims 2-4, characterized in that, The temperature control method includes: Obtain the number a of detection points with a temperature greater than the second threshold t q and the number b of detection points with a temperature less than the third threshold t p to obtain the value of α, where the magnitude of α is negatively correlated with the value of a - b.

6. The temperature control method of the battery assembly (1) according to any one of claims 1-5, characterized in that, The temperature control method includes: Before the step of obtaining the difference Δt between the maximum value t max and the minimum value t min compare the minimum value t min with a fourth threshold t z , if the minimum value t min is greater than the fourth threshold t z , control the temperature adjustment component (4) to be in a closed state. If the minimum value t min is less than or equal to the fourth threshold t z , perform the step of obtaining the difference Δt between the maximum value t max and the minimum value t min .

7. A controller (5), characterized in that, The controller (5) is used to implement the temperature control method of the battery assembly (1) according to any one of claims 1-6 to regulate the inlet temperature of the liquid flow plate (2).

8. A battery assembly (1), characterized in that, The battery assembly (1) uses the temperature control method of the battery assembly (1) according to any one of claims 1-6. The battery assembly (1) includes: a battery (11), and a temperature control assembly (4). The temperature control assembly (4) is disposed on one side of the battery (11) to perform heat exchange with the battery (11). The temperature control assembly (4) has a liquid flow plate (2), and the liquid flow plate (2) is provided with a liquid flow channel (21) for accommodating liquid. The liquid flow channel (21) is provided with a liquid inlet (211) and a liquid outlet (212).

9. The battery assembly (1) according to claim 8, characterized in that, The battery pack (11) includes a first temperature zone (1101) and a second temperature zone (1102).

10. The battery assembly (1) according to claim 8 or 9, characterized in that, The battery (11) includes battery cells (113). The battery cells (113) have a main body (112) and pole columns (111) located at the ends in the length direction of the main body (112). The first temperature zone (1101) is located at the pole columns (111), and the second temperature zone (1102) is located at the main body (112). The battery assembly (1) further includes a plurality of temperature detection elements (12), and the plurality of temperature detection elements (12) are respectively arranged on the pole columns (111) and the main body (112).

11. The battery assembly (1) according to claim 10, characterized in that, The battery (11) includes a plurality of the battery cells (113). The plurality of battery cells (113) are arranged side by side in the width direction. The plurality of temperature detection elements (12) are at least arranged on the main body (112) of the battery cells (113) located at the ends and on the pole columns (111) of at least one of the battery cells.

12. The battery module (1) according to any one of claims 8-11, characterized in that, The liquid flow channel (21) includes a first flow channel zone (2103) and a second flow channel zone (2104) that are interconnected. The first flow channel zone (2103) includes a plurality of interconnected first flow channels (213), and the second flow channel zone (2104) includes a plurality of interconnected second flow channels (214). The first flow channels (213) are in communication with the liquid inlet (211), and the second flow channels (214) are in communication with the liquid outlet (212). The extending directions of the first flow channels (213) and the second flow channels (214) are the same as the width direction of the battery (11).

13. The battery assembly (1) according to claim 12, characterized in that, The first flow channels (213) are respectively arranged at positions close to the pole columns (111), and the second flow channels (214) are arranged at positions far from the pole columns (111).

14. The battery assembly (1) according to claim 12 or 13, characterized in that, A flow channel switching part (216) is connected between the first flow channel (213) and the second flow channel (214). The flow channel switching part (216) includes a plurality of protrusions (215) arranged at intervals, and is used for converging and then diverting the liquid in the plurality of first flow channels (213).

15. The battery assembly (1) according to any one of claims 8-14, characterized in that, The temperature adjustment component (4) includes a heating film (3) disposed at least at one end in the height direction of the battery (11), and the heating film (3) is attached to the battery (11).

16. The battery assembly (1) according to claim 15, characterized in that, The heating film (3) includes a plurality of independent film units (31).

17. The battery assembly (1) according to any one of claims 8-16, characterized in that, The battery assembly (1) is a self-heating battery.

18. An electrical power system (6), characterized in that, It includes the battery assembly (1) according to any one of claims 8-17.

Images