Battery assembly, battery assembly control method and device, equipment and storage medium

Abstract

The invention relates to a battery assembly, a battery assembly control method and device, equipment and a storage medium. Comprising a box body which is provided with an accommodating space for accommodating a battery cell and comprises a bottom plate and a cover plate; the battery cell comprises a first battery cell layer and a second battery cell layer, and the first battery cell layer is located in the containing space and abuts against the bottom plate; the second battery core layer is positioned above the first battery core layer; the heat exchange plates comprise a first heat exchange plate positioned at the bottom of the first battery cell layer, a second heat exchange plate positioned at the top of the second battery cell layer and a third heat exchange plate positioned between the first battery cell layer and the second battery cell layer; heat exchange flow channels for heat exchange fluid to circularly flow are formed in the heat exchange plates; the connecting pipeline is used for communicating the heat exchange flow channels of the heat exchange plates and communicating with the outside; the pipeline control valve is used for controlling the connection and disconnection of each connecting pipeline; and the temperature sensor is used for collecting the temperature of the battery cell. According to the technical scheme, the heat dissipation capability is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery assembly, a battery assembly control method, a device, a equipment and a storage medium. Background Art

[0002] As the number of electric vehicles increases, the use scenarios of electric vehicles also increase. As a result, users' requirements for the range of electric vehicles are gradually increasing. However, in the case of limited space in the car body, improving the capacity density of the battery is the direction of research and development for manufacturers. For example, the battery structure has gradually evolved from cell to module (CTM) to cell to pack (CTP). And in CTP, multi-layer cell designs gradually appear. However, the heat dissipation conditions of multi-layer cells are worse than those of single-layer cells, which affects the performance and service life of the battery. Summary of the invention

[0003] In view of this, the present application provides a battery assembly, a battery assembly control method, a device, a equipment and a storage medium to solve at least one problem existing in the background technology.

[0004] To achieve the above purpose, the technical solution of this application is implemented as follows:

[0005] In a first aspect, an embodiment of the present application provides a battery assembly, including:

[0006] A box body having a containing space for containing the battery cell, the box body comprising a bottom plate and a cover plate, which are respectively located above and below the containing space;

[0007] The battery core comprises a first battery core layer and a second battery core layer, wherein the first battery core layer is located in the accommodating space and abuts against the bottom plate; and the second battery core layer is located above the first battery core layer;

[0008] The heat exchange plates include a first heat exchange plate located at the bottom of the first battery core layer, a second heat exchange plate located at the top of the second battery core layer, and a third heat exchange plate located between the first battery core layer and the second battery core layer; the heat exchange plates are provided with heat exchange channels for circulating heat exchange fluid;

[0009] A connecting pipe, used to connect the heat exchange channels of each heat exchange plate and the outside, including a first pipe, a second pipe and a third pipe; the first pipe is used to connect the first heat exchange plate with the third heat exchange plate, the second pipe is used to connect the second heat exchange plate with the third heat exchange plate, and the third pipe is used to connect the third heat exchange plate with an external fluid inlet and outlet pipe;

[0010] A pipeline control valve, used to control the on-off of each connecting pipeline; the pipeline control valve includes a first control valve arranged in the first pipe, a second control valve arranged in the second pipe and a third control valve arranged in the third pipe;

[0011] The temperature sensor is used to collect the temperature of the battery cell, so as to control the operation of each pipeline control valve according to the collected temperature, thereby adjusting the temperature of the battery cell.

[0012] Optionally, the second pipe and the third pipe partially overlap; the second control valve is arranged at a portion of the second pipe that does not overlap with the third pipe.

[0013] Optionally, the third heat exchange plate is formed by extrusion of series 6 aluminum; and the first heat exchange plate and the second heat exchange plate are formed by stamping of aluminum-manganese alloy.

[0014] In a second aspect, an embodiment of the present application provides a battery assembly control method, which is applied to the battery assembly described above, and the method includes:

[0015] Get the temperature of the battery cell collected by the temperature sensor;

[0016] Determining the operating condition of the battery cell according to the temperature;

[0017] According to the working condition of the battery cell, the operation of the first control valve, the second control valve and the third control valve are controlled respectively, thereby adjusting the temperature of the battery cell.

[0018] Optionally, determining the operating condition of the battery cell according to the temperature includes:

[0019] When the maximum temperature of the battery cell is greater than or equal to a first upper threshold, determining that the battery cell enters a high temperature operating condition;

[0020] When the lowest temperature of the battery cell is less than or equal to a first lower threshold, determining that the battery cell enters a low temperature operating condition;

[0021] When the maximum difference between the temperatures of the battery cells is greater than or equal to the first difference, determining that the battery cells enter a temperature equalization condition;

[0022] When the temperature of the battery cell is abnormal and the voltage of the battery cell is also abnormal, determining that the battery cell enters a thermal runaway condition;

[0023] Otherwise, it is determined that the battery cell is in a normal operating condition.

[0024] Optionally, controlling the operation of the first control valve, the second control valve and the third control valve respectively according to the working condition of the battery cell, thereby adjusting the temperature of the battery cell, includes:

[0025] When the operating condition of the battery cell is a high temperature condition and the maximum temperature is greater than or equal to the first upper threshold value but less than the second upper threshold value, the third control valve is opened and the first control valve and the second control valve are closed;

[0026] When the operating condition of the battery cell is a high temperature condition and the highest temperature is greater than or equal to the second upper threshold, the third control valve, the first control valve and the second control valve are opened.

[0027] Optionally, controlling the operation of the first control valve, the second control valve and the third control valve respectively according to the working condition of the battery cell, thereby adjusting the temperature of the battery cell, includes:

[0028] When the operating condition of the battery cell is a low temperature condition and the lowest temperature is less than or equal to the first lower threshold value but greater than the second lower threshold value, the third control valve is opened and the first control valve and the second control valve are closed;

[0029] When the operating condition of the battery cell is a low temperature condition and the lowest temperature is less than or equal to the second lower threshold, the third control valve, the first control valve and the second control valve are opened.

[0030] Optionally, controlling the operation of the first control valve, the second control valve and the third control valve respectively according to the working condition of the battery cell, thereby adjusting the temperature of the battery cell, includes:

[0031] When the working condition of the battery cell is the temperature-average working condition, the level of the temperature-average working condition is further determined; when the maximum difference between the temperatures is greater than or equal to the first difference but less than the second difference, it is the first temperature-average working condition; when the maximum difference between the temperatures is greater than or equal to the second difference, it is the second temperature-average working condition;

[0032] In the first temperature-averaging condition, the third control valve is opened, and the first control valve and the second control valve are closed;

[0033] In the second temperature-averaging condition, the third control valve, the first control valve and the second control valve are opened.

[0034] Optionally, controlling the operation of the first control valve, the second control valve and the third control valve respectively according to the working condition of the battery cell, thereby adjusting the temperature of the battery cell, includes:

[0035] When the operating condition of the battery cell is a thermal runaway condition, and the battery cell in the first battery layer is in the thermal runaway condition, the third control valve and the first control valve are opened, and the second control valve is closed;

[0036] When the operating condition of the battery cell is a thermal runaway condition, and the battery cell in the second battery layer is in the thermal runaway condition, the third control valve and the second control valve are opened, and the first control valve is closed;

[0037] When the operating condition of the battery cell is a thermal runaway condition, and both the first battery cell layer and the second battery cell layer have batteries in a thermal runaway state, the third control valve, the first control valve and the second control valve are opened.

[0038] Optionally, controlling the operation of the first control valve, the second control valve and the third control valve respectively according to the working condition of the battery cell, thereby adjusting the temperature of the battery cell, includes:

[0039] If the battery cell triggers multiple operating conditions at the same time, corresponding control is performed in the following order of priority: thermal runaway condition, second temperature-averaging condition, high temperature condition or low temperature condition, and first temperature-averaging condition.

[0040] The battery assembly, battery assembly control method, device, equipment and storage medium provided in the embodiments of the present application include: a box body having a storage space for accommodating a battery cell, the box body including a bottom plate and a cover plate, which are respectively located above and below the storage space; a battery cell including a first battery cell layer and a second battery cell layer, the first battery cell layer is located in the storage space and abuts the bottom plate; the second battery cell layer is located above the first battery cell layer; a heat exchange plate including a first heat exchange plate located at the bottom of the first battery cell layer, a second heat exchange plate located at the top of the second battery cell layer and a third heat exchange plate located between the first battery cell layer and the second battery cell layer; a heat exchange channel for circulating a heat exchange fluid is provided in each of the heat exchange plates; The connecting pipe is used to connect the heat exchange channels of each heat exchange plate and the outside, including a first pipe, a second pipe and a third pipe; the first pipe is used to connect the first heat exchange plate with the third heat exchange plate, the second pipe is used to connect the second heat exchange plate with the third heat exchange plate, and the third pipe is used to connect the third heat exchange plate with the external fluid inlet and outlet pipe; the pipe control valve is used to control the on and off of each connecting pipe; the pipe control valve includes a first control valve arranged in the first pipe, a second control valve arranged in the second pipe and a third control valve arranged in the third pipe; the temperature sensor is used to collect the temperature of the battery cell to control the operation of each pipe control valve according to the collected temperature, thereby adjusting the temperature of the battery cell. It can be seen that the battery assembly, battery assembly control method, device, equipment and storage medium of the embodiment of the present application, in addition to the heat exchange plate being arranged in each battery cell layer, a heat exchange plate and a pipe control valve for controlling the fluid circulation flow of the heat exchange plate are added between the two battery cell layers. When the battery is greater than or equal to the second upper threshold value, the fluid circulation of all heat exchange plates can be opened to improve the heat dissipation capacity. When the battery is only greater than the first upper threshold, only the fluid circulation of the heat exchange plate between the two battery core layers can be turned on, which can save energy. Therefore, the battery assembly, battery assembly control method, device, equipment and storage medium of the embodiment of the present application improve the heat dissipation capacity.

[0041] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0043] Figure 1 This is a schematic diagram of an exploded view of a battery assembly provided in Example 1 of the present application;

[0044] Figure 2 A schematic diagram of a connecting pipe and a pipe control valve in a battery assembly provided in Example 1 of the present application;

[0045] Figure 3 A schematic diagram of the circulation of a heat exchange fluid in a battery assembly provided in Example 1 of the present application;

[0046] Figure 4 A schematic diagram of a flow chart of a battery assembly control method provided in Embodiment 2 of the present application;

[0047] Figure 5 A schematic flow chart of the cooling strategy in the battery assembly control method provided in Example 2 of the present application;

[0048] Figure 6 A schematic flow chart of a heating strategy in a battery assembly control method provided in Example 2 of the present application;

[0049] Figure 7 A schematic flow chart of a temperature equalization strategy in a battery assembly control method provided in Example 2 of the present application;

[0050] Figure 8 A schematic flow chart of a thermal control strategy in a battery assembly control method provided in Example 2 of the present application;

[0051] Fig. 9 A schematic diagram of the structure of a battery assembly control device provided in Example 3 of the present application;

[0052] Fig.10 A schematic diagram of the structure of the computing device provided in Example 4 of the present application.

[0053] Description of reference numerals:

[0054] 10. Box body; 11. Bottom plate; 21. First battery core layer; 22. Second battery core layer; 31. First heat exchange plate; 32. Second heat exchange plate; 33. Third heat exchange plate; 40. Connecting pipe; 41. First pipe; 42. Second pipe; 43. Third pipe; 51. First control valve; 52. Second control valve; 53. Third control valve; 700. Battery assembly control device; 701. Acquisition module; 702. Determination module; 703. Control module; 800. Computing device; 801. Storage component; 802. Communication bus; 803. Processing component; 804. Input device; 805. Output device; 806. External communication interface. DETAILED DESCRIPTION

[0055] In order to make the technical solutions and beneficial effects of the present application more obvious and easy to understand, the following is a detailed description by listing specific embodiments. The drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show the details of the local features; unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which the present application belongs.

[0056] In the description of the present application, terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of simplified description of the present application, and do not indicate that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and should not be understood as a limitation on the present application.

[0057] In this application, the terms "first" and "second" are used only for the purpose of clear description and should not be understood as the relative importance of the indicated features or the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly include at least one of the features. In the description of this application, "multiple" means at least two, such as two, three, etc.; "several" means at least one, such as one, two, three, etc., unless otherwise clearly and specifically defined.

[0058] In this application, unless otherwise clearly defined, the terms "install", "connect", "connect", "fix", "set", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0059] In the present application, unless otherwise clearly defined, a first feature being “on”, “above”, “above”, “below”, “below”, “below” or “below” a second feature may mean that the first feature is in direct contact with the second feature, or the first feature and the second feature are in indirect contact with each other through an intermediate medium. Moreover, a first feature being “on”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than the horizontal height of the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0060] In order to thoroughly understand the present application, detailed steps and detailed structures will be presented in the following description to illustrate the technical solution of the present application. The preferred embodiments of the present application are described in detail below, but in addition to these detailed descriptions, the present application may also have other implementation methods.

[0061] Embodiment 1

[0062] In view of the technical problems in the related art, the present application provides a battery assembly. Figure 1 and Figure 2 , the battery assembly comprises:

[0063] The box body 10 has a storage space for accommodating the battery cell, and the box body 10 includes a bottom plate 11 and a cover plate, which are respectively located above and below the storage space;

[0064] The battery core comprises a first battery core layer 21 and a second battery core layer 22, wherein the first battery core layer 21 is located in the accommodating space and abuts against the bottom plate 11; and the second battery core layer 22 is located above the first battery core layer 21;

[0065] The heat exchange plate comprises a first heat exchange plate 31 located at the bottom of the first battery core layer 21, a second heat exchange plate 32 located at the top of the second battery core layer 22, and a third heat exchange plate 33 located between the first battery core layer 21 and the second battery core layer 22; the heat exchange plates are provided with heat exchange channels for circulating heat exchange fluid;

[0066] The connecting pipe 40 is used to connect the heat exchange channels of each heat exchange plate and the outside, and includes a first pipe 41, a second pipe 42 and a third pipe 43; the first pipe 41 is used to connect the first heat exchange plate 31 with the third heat exchange plate 33, the second pipe 42 is used to connect the second heat exchange plate 32 with the third heat exchange plate 33, and the third pipe 43 is used to connect the third heat exchange plate 33 with an external fluid inlet and outlet pipe;

[0067] A pipeline control valve, used to control the on-off of each connecting pipeline 40; the pipeline control valve includes a first control valve 51 arranged in the first pipe 41, a second control valve 52 arranged in the second pipe 42, and a third control valve 53 arranged in the third pipe 43;

[0068] The temperature sensor is used to collect the temperature of the battery cell, so as to control the operation of each pipeline control valve according to the collected temperature, thereby adjusting the temperature of the battery cell.

[0069] It can be understood that the box 10 is applied to a battery cell, that is, one box 10 accommodates one battery cell. A battery cell is a basic unit combined into a battery pack (Pack), and a battery cell can be a battery cell, or a plurality of battery cells stacked. The battery cell in this embodiment can be two battery cells, namely a first battery cell layer 21 and a second battery cell layer 22. It can be understood that there can also be more battery cells.

[0070] Understandably, in the industry, there is no distinction between battery cells and battery cells. For the sake of convenience, this article does not make a distinction. The individual battery cells in a battery cell are collectively referred to as battery cells. Battery packs are also called battery assemblies, and this article uniformly refers to them as battery assemblies.

[0071] It can be seen that the first heat exchange plate 31 can exchange heat with the first battery core layer 21, the second heat exchange plate 32 can exchange heat with the second battery core layer 22, and the third heat exchange plate 33 can exchange heat with both the first battery core layer 21 and the second battery core layer 22, and the exchange position is different from the first heat exchange plate 31 and the second heat exchange plate 32. In this way, when a lot of heat needs to be exchanged, the third heat exchange plate 33 can greatly increase the heat exchange effect. If not much heat needs to be exchanged, only the third heat exchange plate 33 can be turned on to save energy.

[0072] The pipeline control valve may be a valve that can be controlled by an intelligent control component, such as an intelligent valve or an electric valve combination driver.

[0073] In the battery assembly of the embodiment of the present application, in addition to heat exchange plates being provided in each battery core layer, a heat exchange plate and a pipeline control valve for controlling the fluid circulation flow of the heat exchange plate are added between two battery core layers. When the battery is greater than or equal to the second upper threshold, the fluid circulation of all heat exchange plates can be opened to improve the heat dissipation capacity. When the battery is only greater than the first upper threshold, only the fluid circulation of the heat exchange plate between the two battery core layers can be opened to save energy consumption.

[0074] In some other embodiments of the present application, the battery assembly further includes a third battery core layer, and the third battery core layer is located between the first battery core layer 21 and the second battery core layer 22; a heat exchange plate is arranged between two upper and lower adjacent battery cores.

[0075] That is, the battery cell can not only be two cells arranged on top and bottom, but also more stacked cells. The third cell layer can be multiple cell layers, for example, two or three, then the number of cells in the entire battery cell is the number of the third cell layer plus two. Regardless of the number, a heat exchange plate can be set between the two adjacent cells on the top and bottom. For example, if the battery cell has 5 cells, there are 6 heat exchange plates.

[0076] In some other embodiments of the present application, the second heat exchange plate 32 is a cover plate of the box body 10 .

[0077] In this way, the structure is simpler and the cost is reduced. In addition, the volume of the battery cell is smaller. Under the condition of the same battery capacity, the volume and weight are smaller, which is conducive to saving energy consumption; under the condition of the same battery volume, the battery capacity can be increased.

[0078] In other embodiments of the present application, reference Figure 2 , the second pipe 42 and the third pipe 43 partially overlap; the second control valve 52 is arranged at the part where the second pipe 42 and the third pipe 43 do not overlap.

[0079] It can be understood that both the first tube 41 and the second tube 42 are connected to the third heat exchange plate 33 , so the first tube 41 and the second tube 42 are connected when the pipeline control valve is opened.

[0080] Specifically, the first tube 41 and the second tube 42 are respectively connected to the upper and lower surfaces of the third heat exchange plate 33, and the first tube 41 and the second tube 42 are aligned vertically. In this way, the structure of the heat exchange channel of the third heat exchange plate 33 connected to the outside is simpler.

[0081] It can be understood that the second tube 42 and the third tube 43 partially overlap, and the third tube 43 can be connected to the second tube 42, and the flow channel communication with the third heat exchange plate 33 is established through the second tube 42. In this way, the length of the third tube 43 is reduced, and the number of flow channel openings of the third heat exchange plate 33 is also reduced.

[0082] It can be understood that the second control valve 52 is disposed at the portion of the second pipe 42 that does not overlap with the third pipe 43 , so as to avoid affecting the operation of the third pipe 43 when controlling the second pipe 42 .

[0083] Specifically, refer to Figure 3 The connecting pipe 40 in the battery assembly is connected to the heat exchanger of the vehicle air conditioning system through a water pump, and an overflow is provided to form a water flow loop. That is, when the battery assembly needs to adjust the temperature, water is obtained from the heat exchanger through the water pump, and the water in the original connecting pipe 40 flows to the heat exchanger through the overflow, forming a water flow cycle. The heat exchanger exchanges heat with the water flowing out of the battery assembly through the overflow according to the temperature of the battery assembly, such as dissipating heat or heating.

[0084] In some other embodiments of the present application, the third heat exchange plate 33 is formed by extrusion of series 6 aluminum; the first heat exchange plate 31 and the second heat exchange plate 32 are formed by stamping of aluminum-manganese alloy.

[0085] It can be understood that extrusion molding can provide higher strength than stamping under the condition of the same material and the same plate thickness. In this way, the third heat exchange plate 33 is extruded to withstand the extrusion of the upper and lower battery core layers at the same time, thereby improving the structural strength and mode of the battery assembly.

[0086] In addition, the third heat exchange plate 33 is formed by extrusion, and the upper and lower surfaces of the heat exchange plate are both flat. In this way, the third heat exchange plate 33 is formed by extrusion, and the contact area with the upper and lower battery core layers is relatively large, which can achieve a good heat exchange effect.

[0087] Moreover, the thickness of the formed plate is relatively thick, which is convenient for welding and fixing with the side wall of the box body 10, and can better fix the third heat exchange plate 33 without the need to additionally set up multiple supporting ribs or supporting brackets, thereby improving the volume utilization of the battery assembly.

[0088] The first heat exchange plate 31 and the second heat exchange plate 32 are formed by stamping, which can reduce the thickness of the heat exchange plate, which is conducive to the lightweight design of the battery assembly. In addition, although one side of the first heat exchange plate 31 and the second heat exchange plate 32 formed by stamping is uneven due to the flow channel, it has no effect because only one side needs to be in thermal contact with the battery core layer. And stamping is lower in cost.

[0089] Specifically, the first heat exchange plate 31 and the second heat exchange plate 32 are formed by stamping, which means that the flow channel plate adopts a stamping process, and then after the stamping is completed, a flat plate is welded on the flow channel plate by a welding process to close the flow channel.

[0090] More specifically, the welding process is brazing.

[0091] Furthermore, the first heat exchange plate 31 may also be formed by extrusion. In this way, since the extruded heat exchange plate is thicker and has a higher structural strength, there is no need to add an additional bottom guard plate at the bottom of the box body 10 .

[0092] Specifically, the material of the third heat exchange plate 33 is a 6-series aluminum alloy. 6-series aluminum alloy is a type of aluminum alloy composed of elements such as aluminum, magnesium and silicon. It includes common models such as 6061 and 6063, and is commonly used in aerospace, shipbuilding, automobiles, construction, electronics and other fields. 6-series aluminum alloy has excellent mechanical properties, corrosion resistance and machinability, and is one of the most widely used aluminum alloys.

[0093] Specifically, the material of the first heat exchange plate 31 and the second heat exchange plate 32 are both AL3003mod, where 3003mod means that 3003 aluminum manganese alloy is subjected to metal organic deposition (Metal Organic Deposition) to obtain a thin film or coating. This coating technology can improve the hardness and corrosion resistance of the material and is used to manufacture various industrial and consumer products.

[0094] In some other embodiments of the present application, thermal conductive glue (not shown in the figures) is filled between the heat exchange plate and the battery core.

[0095] Thermally conductive adhesive can fill the installation gap between the battery core layer and the heat exchange plate, and provide excellent thermal conductivity. It also has good structural strength such as pulling and shearing, improving the modality of the entire battery assembly.

[0096] Specifically, the material of the thermal conductive adhesive may be polyurethane (PU), which is produced by polymerization after mixing isocyanate and polyol, has good aging resistance, and can increase the service life of the battery assembly.

[0097] Embodiment 2

[0098] This embodiment provides a battery assembly control method, which is applied to the battery assembly described in Embodiment 1. The method can be implemented by a computer. The computer can be a computing device configured with a processor. The processor can be a general-purpose processor, a digital signal processor (DSP), a field programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0099] refer to Figure 4 , the method comprising:

[0100] Step 601: Acquire the temperature of the battery cell collected by the temperature sensor;

[0101] Step 602: Determine the operating condition of the battery cell according to the temperature;

[0102] Step 603: According to the working condition of the battery cell, the operation of the first control valve 51, the second control valve 52 and the third control valve 53 are controlled respectively, so as to adjust the temperature of the battery cell.

[0103] Compared with the prior art, which simply dissipates heat or heats, the embodiment of the present application proposes to determine the working condition of the battery cell according to the temperature of the battery cell. In addition, on the basis of adding a third heat exchange plate 33 and setting three control valves in the first embodiment, more accurate control can be implemented according to the working condition of the battery cell, and the temperature of the battery cell can be more effectively adjusted.

[0104] Specifically, the temperature sensors can be set at multiple locations of the battery assembly to more comprehensively collect the temperature information of the battery cells. More specifically, the present embodiment is configured as follows: six temperature sensors are set at each layer of battery cells, both on the sides and in the middle. A total of twelve temperature sensors are set in the entire battery assembly.

[0105] Specifically, the temperature sensor can be a negative temperature coefficient (NTC) thermistor sensor. NTC thermistor sensors have the advantages of high sensitivity, fast response speed, high resistance and B value accuracy, good consistency and interchangeability, and because of the double-layer encapsulation process, they have good insulation sealing and mechanical collision resistance and bending resistance. B value is the material constant of NTC thermistor, also called thermal index.

[0106] Specifically, the control valve can be a solenoid valve, which has flexible control and low cost.

[0107] In some other embodiments of the present application, determining the operating condition of the battery cell according to the temperature includes:

[0108] When the maximum temperature of the battery cell is greater than or equal to a first upper threshold, determining that the battery cell enters a high temperature operating condition;

[0109] When the lowest temperature of the battery cell is less than or equal to a first lower threshold, determining that the battery cell enters a low temperature operating condition;

[0110] When the maximum difference between the temperatures of the battery cells is greater than or equal to the first difference, determining that the battery cells enter a temperature equalization condition;

[0111] When the temperature of the battery cell is abnormal and the voltage of the battery cell is also abnormal, determining that the battery cell enters a thermal runaway condition;

[0112] Otherwise, it is determined that the battery cell is in a normal operating condition.

[0113] The maximum temperature of a cell refers to the highest cell temperature measured by each temperature sensor in the battery assembly. Similarly, the minimum temperature of a cell refers to the lowest cell temperature measured by each temperature sensor in the battery assembly. The maximum difference between the temperatures of a cell refers to the difference between the highest cell temperature and the lowest cell temperature.

[0114] Specifically, the first upper threshold value of the battery assembly in this embodiment may be 30°C-40°C, the first lower threshold value may be 0°C-10°C, and the first difference value may be 3°C-13°C.

[0115] In thermal runaway conditions, the temperature of the battery cell is abnormal, which can be any of the high temperature conditions, low temperature conditions, or conditions to be kept at a constant temperature. It can also be that the temperature is very high for a short time or the temperature rises very quickly. The voltage of the battery cell is abnormal, which can be that the voltage value suddenly drops very fast, the voltage value is very low for a short time, or the voltage value cannot be measured.

[0116] Specifically, the following Table 1 can be used to preliminarily determine whether the battery cell has entered a thermal runaway condition.

[0117] Table 1

[0118]

[0119]

[0120] As can be seen from the above, the condition for determining thermal runaway in this embodiment requires at least one temperature anomaly and one voltage anomaly. In this way, it is not easy to misjudge a normal operating condition as a thermal runaway operating condition, nor is it easy to miss a thermal runaway operating condition.

[0121] In some other embodiments of the present application, the operation of the first control valve 51, the second control valve 52 and the third control valve 53 are controlled respectively according to the working condition of the battery cell, thereby adjusting the temperature of the battery cell, including:

[0122] When the working condition of the battery cell is a high temperature condition, and the maximum temperature is greater than or equal to the first upper threshold value but less than the second upper threshold value, the third control valve 53 is opened, and the first control valve 51 and the second control valve 52 are closed;

[0123] When the operating condition of the battery cell is a high temperature condition and the maximum temperature is greater than or equal to the second upper threshold, the third control valve 53, the first control valve 51 and the second control valve 52 are opened.

[0124] For high temperature working conditions, the function of the heat exchange plate is to dissipate heat. Depending on the different conditions of the high temperature working conditions, that is, the range of the highest temperature, it can be selected to open only the third control valve 53 or to open all the control valves. In this way, the temperature of the battery cell can be better controlled and the energy consumption can be lowered.

[0125] Specifically, the second upper threshold value of the battery assembly in this embodiment may be 40°C-50°C.

[0126] Furthermore, in the process of opening the corresponding control valve to adjust the temperature according to the working condition of the battery cell, such as high temperature working condition (hereinafter referred to as temperature control operation), it is also necessary to obtain the temperature of the battery cell regularly or irregularly. After the temperature of the battery cell is adjusted to the preset exit temperature range, the temperature control operation can be exited.

[0127] It should be noted that the preset exit temperature range here is slightly different from the temperature threshold for entering the temperature control operation, such as the first upper threshold, and it is necessary to go one step further in the original temperature control direction before exiting. For example, for high temperature conditions, after the temperature control operation is performed, the preset exit temperature range needs to be lower than the original temperature range. The lower temperature depends on the specific situation. In this way, the frequent start of the temperature control operation can be reduced. Assuming that the first upper threshold is 30℃-40℃, the preset exit temperature range can be 27℃-37℃, which is 3℃ lower. Assuming that the second upper threshold is 40℃-50℃, the preset exit temperature range can be 33℃-43℃, which is 7℃ lower. Other working conditions are similar and will not be introduced one by one.

[0128] In order to better understand the control method of battery components under high temperature conditions, refer to the following Figure 5 The flowchart is given for further introduction.

[0129] Step 611: Is Tmax ≥ the first upper threshold? Tmax is the maximum temperature of the battery cell. If not, proceed to step 612; if yes, proceed to step 613.

[0130] Step 612: The third control valve 53, the first control valve 51 and the second control valve 52 are all closed, that is, no heat exchange is required.

[0131] Step 613: Tmax ≥ second upper threshold? If not, proceed to step 614; if yes, proceed to step 616.

[0132] Step 614: Open the third control valve 53, and close the first control valve 51 and the second control valve 52. That is, heat exchange with the battery cell is performed only through the third heat exchange plate 33.

[0133] Step 615: Tmax ≤ the third upper threshold? If yes, proceed to step 612; if no, return to step 613. That is, consider when to exit the temperature control operation.

[0134] Step 616: Open the third control valve 53, the first control valve 51 and the second control valve 52. That is, all the connecting pipes 40 are opened, and all the heat exchange plates perform heat exchange with the battery cells.

[0135] Step 617: Tmax ≤ fourth upper threshold? If yes, proceed to step 614, otherwise, return to step 616. That is, consider when to exit the temperature control operation.

[0136] In some other embodiments of the present application, the operation of the first control valve 51, the second control valve 52 and the third control valve 53 are controlled respectively according to the working condition of the battery cell, thereby adjusting the temperature of the battery cell, including:

[0137] When the working condition of the battery cell is a low temperature condition, and the lowest temperature is less than or equal to the first lower threshold value but greater than the second lower threshold value, the third control valve 53 is opened, and the first control valve 51 and the second control valve 52 are closed;

[0138] When the working condition of the battery cell is a low temperature condition and the lowest temperature is less than or equal to the second lower threshold, the third control valve 53, the first control valve 51 and the second control valve 52 are opened.

[0139] Similarly, for low temperature conditions, it is also possible to choose to open only the third control valve 53, or open all the control valves. In this way, the battery cell temperature can be better controlled and energy consumption can be lowered.

[0140] Specifically, the second lower threshold value of the battery assembly in this embodiment may be -15°C-5°C.

[0141] In order to better understand the control method of battery components under low temperature conditions, refer to the following Figure 6 The flowchart is given for further introduction.

[0142] Step 621: Tmin≤first lower threshold? Tmin is the lowest temperature of the battery cell. If not, proceed to step 622; if yes, proceed to step 623.

[0143] Step 622: The third control valve 53, the first control valve 51 and the second control valve 52 are all closed, that is, no heat exchange is required.

[0144] Step 623: Tmin≤second lower threshold? If not, proceed to step 624; if yes, proceed to step 626.

[0145] Step 624: Open the third control valve 53, and close the first control valve 51 and the second control valve 52. That is, heat exchange with the battery cell is performed only through the third heat exchange plate 33.

[0146] Step 625: Tmin ≥ the third lower threshold? If yes, proceed to step 622; if no, return to step 623. That is, consider when to exit the temperature control operation.

[0147] Step 626: Open the third control valve 53, the first control valve 51 and the second control valve 52. That is, all the connecting pipes 40 are opened, and all the heat exchange plates perform heat exchange with the battery cells.

[0148] Step 627: Tmin ≥ fourth lower threshold? If yes, proceed to step 624; if no, return to step 626. That is, consider when to exit the temperature control operation.

[0149] In some other embodiments of the present application, the operation of the first control valve 51, the second control valve 52 and the third control valve 53 are controlled respectively according to the working condition of the battery cell, thereby adjusting the temperature of the battery cell, including:

[0150] When the working condition of the battery cell is the temperature-average working condition, the level of the temperature-average working condition is further determined; when the maximum difference between the temperatures is greater than or equal to the first difference but less than the second difference, it is the first temperature-average working condition; when the maximum difference between the temperatures is greater than or equal to the second difference, it is the second temperature-average working condition;

[0151] In the first temperature-averaging condition, the third control valve 53 is opened, and the first control valve 51 and the second control valve 52 are closed;

[0152] In the second temperature-averaging condition, the third control valve 53, the first control valve 51 and the second control valve 52 are opened.

[0153] Similarly, for the temperature-averaging condition, it is also possible to choose to open only the third control valve 53, or open all the control valves. In this way, the battery cell temperature can be better controlled and the energy consumption can be lowered.

[0154] Specifically, the second difference of the battery assembly in this embodiment may be 10°C-20°C.

[0155] Furthermore, the temperature-averaging operation can be performed according to the conditions of the first battery layer 21 and the second battery layer 22. For example, if the temperature difference is large only in the first battery layer 21, only the third control valve 53 and the first control valve 51 can be opened, and the second control valve 52 can be closed. For another example, if the temperature difference is large only in the second battery layer 22, the third control valve 53 and the second control valve 52 can be opened. This also takes into account both the temperature control effect and the energy consumption.

[0156] In order to better understand the control method of battery components under the condition of uniform temperature, refer to the following Figure 7 The flowchart is given for further introduction.

[0157] Step 631: ΔT ≥ first difference? ΔT is the maximum difference between the temperatures of the battery cells. If no, proceed to step 632; if yes, proceed to step 633.

[0158] Step 632: The third control valve 53, the first control valve 51 and the second control valve 52 are all closed, that is, no heat exchange is required.

[0159] Step 633: ΔT ≥ second difference? If no, proceed to step 634; if yes, proceed to step 636.

[0160] Step 634: Is it in the heating or cooling process? If yes, go to step 635; if no, go to step 637.

[0161] Step 635: Maintain the current heating or cooling process, that is, there is no need to change the current state of the control valve.

[0162] Step 636: Open the third control valve 53, the first control valve 51 and the second control valve 52. That is, all the connecting pipes 40 are opened, and all the heat exchange plates perform heat exchange with the battery cells.

[0163] Step 637: Open the third control valve 53, and close the first control valve 51 and the second control valve 52. That is, heat exchange with the battery cell is performed only through the third heat exchange plate 33.

[0164] Step 638: ΔT ≤ third difference? If yes, proceed to step 632; if no, return to step 637. That is, consider when to exit the temperature control operation.

[0165] Step 639: ΔT ≤ fourth difference? If yes, proceed to step 637; if no, return to step 636. That is, consider when to exit the temperature control operation.

[0166] In some other embodiments of the present application, the operation of the first control valve 51, the second control valve 52 and the third control valve 53 are controlled respectively according to the working condition of the battery cell, thereby adjusting the temperature of the battery cell, including:

[0167] When the working condition of the battery cell is a thermal runaway condition, and the battery cell in the first battery layer 21 is in the thermal runaway condition, the third control valve 53 and the first control valve 51 are opened, and the second control valve 52 is closed;

[0168] When the working condition of the battery cell is a thermal runaway condition, and the battery cell in the second battery layer 22 is in the thermal runaway condition, the third control valve 53 and the second control valve 52 are opened, and the first control valve 51 is closed;

[0169] When the operating condition of the battery cell is a thermal runaway condition, and both the first battery cell layer 21 and the second battery cell layer 22 have batteries in a thermal runaway state, the third control valve 53, the first control valve 51 and the second control valve 52 are opened.

[0170] Similarly, for thermal runaway conditions, you can choose to open only two control valves, or open all control valves. This way, you can better control the battery cell temperature and reduce energy consumption.

[0171] In the same temperature-averaging condition, the thermal runaway condition can be respectively performed according to the conditions of the first battery layer 21 and the second battery layer 22. For example, if the thermal runaway only occurs in the first battery layer 21, only the third control valve 53 and the first control valve 51 can be opened, and the second control valve 52 can be closed. For another example, if the thermal runaway only occurs in the second battery layer 22, the third control valve 53 and the second control valve 52 can be opened. This also takes into account both the temperature control effect and the energy consumption.

[0172] In order to better understand the control method of battery components under thermal runaway conditions, refer to the following Figure 8 The flowchart is given for further introduction.

[0173] Step 641: Is there thermal runaway? For the determination of thermal runaway, refer to Table 1. If not, proceed to step 642; if yes, proceed to step 643.

[0174] Step 642: Maintain existing control.

[0175] Step 643: Open the third control valve 53. That is, there is no need to open the first control valve 51 and the second control valve 52, and heat exchange with the battery cell is only performed through the third heat exchange plate 33. In addition, if it is confirmed that the vehicle is in a thermal runaway condition, corresponding control measures need to be taken for the vehicle system, which will not be described in detail.

[0176] Step 644: Is the first battery cell in thermal runaway? If yes, proceed to step 645; if no, proceed to step 646.

[0177] Step 645: Open the first control valve 51. That is, start the heat exchange process of the heat exchange plate associated with the first battery cell. After executing step 645, you can return to step 641, that is, it is necessary to determine whether to enter thermal runaway at a fixed time, and the timing time can be set according to the specific situation of the battery.

[0178] Step 646: Is the second battery cell in thermal runaway? If yes, proceed to step 647; if no, proceed to step 648.

[0179] Step 647: Open the second control valve 52. That is, start the heat exchange process of the heat exchange plate associated with the second battery cell. After executing step 647, you can return to step 641, that is, it is necessary to determine whether to enter thermal runaway at a fixed time, and the timing time can be set according to the specific situation of the battery.

[0180] Step 648: Open the first control valve 51 and the second control valve 52. If it is not possible to determine which battery cell is in thermal runaway, all control valves are opened. After executing step 648, the process returns to step 641, that is, it is necessary to determine whether thermal runaway has occurred at a fixed time, and the timing can be set according to the specific situation of the battery.

[0181] In some other embodiments of the present application, the operation of the first control valve 51, the second control valve 52 and the third control valve 53 are controlled respectively according to the working condition of the battery cell, thereby adjusting the temperature of the battery cell, including:

[0182] If the battery cell triggers multiple operating conditions at the same time, corresponding control is performed in the following order of priority: thermal runaway condition, second temperature-averaging condition, high temperature condition or low temperature condition, and first temperature-averaging condition.

[0183] This is determined based on the impact of various situations on the performance and life of the battery components. The basis for determination is not only theory, but also various actual test data. In this way, the battery components can be better maintained in good working condition and the impact on service life is relatively small.

[0184] Embodiment 3

[0185] This embodiment provides a battery assembly control device 700, which is applied to the battery assembly described in the first embodiment. Fig. 9 , the battery assembly control device 700 includes:

[0186] An acquisition module 701 is used to acquire the temperature of the battery cell collected by a temperature sensor;

[0187] A determination module 702, configured to determine the operating condition of the battery cell according to the temperature;

[0188] The control module 703 is used to control the operation of the first control valve 51 , the second control valve 52 and the third control valve 53 respectively according to the working conditions of the battery cell, thereby adjusting the temperature of the battery cell.

[0189] In some other embodiments of the present application, the determining module 702 is further configured to:

[0190] When the maximum temperature of the battery cell is greater than or equal to a first upper threshold, determining that the battery cell enters a high temperature operating condition;

[0191] When the lowest temperature of the battery cell is less than or equal to a first lower threshold, determining that the battery cell enters a low temperature operating condition;

[0192] When the maximum difference between the temperatures of the battery cells is greater than or equal to the first difference, determining that the battery cells enter a temperature equalization condition;

[0193] When the temperature of the battery cell is abnormal and the voltage of the battery cell is also abnormal, determining that the battery cell enters a thermal runaway condition;

[0194] Otherwise, it is determined that the battery cell is in a normal operating condition.

[0195] Specifically, the first upper threshold value of the battery assembly in this embodiment may be 30°C-40°C, the first lower threshold value may be 0°C-10°C, and the first difference value may be 3°C-13°C.

[0196] In thermal runaway conditions, the temperature of the battery cell is abnormal, which can be any of the high temperature conditions, low temperature conditions, or conditions to be kept at a constant temperature. It can also be that the temperature is very high for a short time or the temperature rises very quickly. The voltage of the battery cell is abnormal, which can be that the voltage value suddenly drops very fast, the voltage value is very low for a short time, or the voltage value cannot be measured.

[0197] Specifically, Table 1 can be used to preliminarily determine whether the battery cell has entered a thermal runaway condition.

[0198] In some other embodiments of the present application, the control module 703 is further used to:

[0199] When the working condition of the battery cell is a high temperature condition, and the maximum temperature is greater than or equal to the first upper threshold value but less than the second upper threshold value, the third control valve 53 is opened, and the first control valve 51 and the second control valve 52 are closed;

[0200] When the operating condition of the battery cell is a high temperature condition and the maximum temperature is greater than or equal to the second upper threshold, the third control valve 53, the first control valve 51 and the second control valve 52 are opened.

[0201] For high temperature working conditions, the function of the heat exchange plate is to dissipate heat. Depending on the different conditions of the high temperature working conditions, that is, the range of the highest temperature, it can be selected to open only the third control valve 53 or to open all the control valves. In this way, the temperature of the battery cell can be better controlled and the energy consumption can be lowered.

[0202] Furthermore, in the process of opening the corresponding control valve to adjust the temperature according to the working condition of the battery cell, such as high temperature working condition (hereinafter referred to as temperature control operation), it is also necessary to obtain the temperature of the battery cell regularly or irregularly. After the temperature of the battery cell is adjusted to the preset exit temperature range, the temperature control operation can be exited.

[0203] It should be noted that the preset exit temperature range here is slightly different from the temperature threshold for entering the temperature control operation, such as the first upper threshold, and it is necessary to go one step further in the original temperature control direction before exiting. For example, for high temperature conditions, after the temperature control operation is performed, the preset exit temperature range needs to be lower than the original temperature range. The lower temperature depends on the specific situation. In this way, the frequent start of the temperature control operation can be reduced. Assuming that the first upper threshold is 30℃-40℃, the preset exit temperature range can be 27℃-37℃, which is 3℃ lower. Assuming that the second upper threshold is 40℃-50℃, the preset exit temperature range can be 33℃-43℃, which is 7℃ lower. Other working conditions are similar and will not be introduced one by one.

[0204] In some other embodiments of the present application, the control module 703 is further used to:

[0205] When the working condition of the battery cell is a low temperature condition, and the lowest temperature is less than or equal to the first lower threshold value but greater than the second lower threshold value, the third control valve 53 is opened, and the first control valve 51 and the second control valve 52 are closed;

[0206] When the working condition of the battery cell is a low temperature condition and the lowest temperature is less than or equal to the second lower threshold, the third control valve 53, the first control valve 51 and the second control valve 52 are opened.

[0207] Similarly, for low temperature conditions, it is also possible to choose to open only the third control valve 53, or open all the control valves. In this way, the battery cell temperature can be better controlled and energy consumption can be lowered.

[0208] In some other embodiments of the present application, the control module 703 is further used to:

[0209] When the working condition of the battery cell is the temperature-average working condition, the level of the temperature-average working condition is further determined; when the maximum difference between the temperatures is greater than or equal to the first difference but less than the second difference, it is the first temperature-average working condition; when the maximum difference between the temperatures is greater than or equal to the second difference, it is the second temperature-average working condition;

[0210] In the first temperature-averaging condition, the third control valve 53 is opened, and the first control valve 51 and the second control valve 52 are closed;

[0211] In the second temperature-averaging condition, the third control valve 53, the first control valve 51 and the second control valve 52 are opened.

[0212] Similarly, for the temperature-averaging condition, it is also possible to choose to open only the third control valve 53, or open all the control valves. In this way, the battery cell temperature can be better controlled and the energy consumption can be lowered.

[0213] Furthermore, the temperature-averaging operation can be performed according to the conditions of the first battery layer 21 and the second battery layer 22. For example, if the temperature difference is large only in the first battery layer 21, only the third control valve 53 and the first control valve 51 can be opened, and the second control valve 52 can be closed. For another example, if the temperature difference is large only in the second battery layer 22, the third control valve 53 and the second control valve 52 can be opened. This also takes into account both the temperature control effect and the energy consumption.

[0214] In some other embodiments of the present application, the control module 703 is further used to:

[0215] When the working condition of the battery cell is a thermal runaway condition, and the battery cell in the first battery layer 21 is in the thermal runaway condition, the third control valve 53 and the first control valve 51 are opened, and the second control valve 52 is closed;

[0216] When the working condition of the battery cell is a thermal runaway condition, and the battery cell in the second battery layer 22 is in the thermal runaway condition, the third control valve 53 and the second control valve 52 are opened, and the first control valve 51 is closed;

[0217] When the operating condition of the battery cell is a thermal runaway condition, and both the first battery cell layer 21 and the second battery cell layer 22 have batteries in a thermal runaway state, the third control valve 53, the first control valve 51 and the second control valve 52 are opened.

[0218] Similarly, for thermal runaway conditions, you can choose to open only two control valves, or open all control valves. This way, you can better control the battery cell temperature and reduce energy consumption.

[0219] In the same temperature-averaging condition, the thermal runaway condition can be respectively performed according to the conditions of the first battery layer 21 and the second battery layer 22. For example, if the thermal runaway only occurs in the first battery layer 21, only the third control valve 53 and the first control valve 51 can be opened, and the second control valve 52 can be closed. For another example, if the thermal runaway only occurs in the second battery layer 22, the third control valve 53 and the second control valve 52 can be opened. This also takes into account both the temperature control effect and the energy consumption.

[0220] In some other embodiments of the present application, the control module 703 is further used to:

[0221] If the battery cell triggers multiple operating conditions at the same time, corresponding control is performed in the following order of priority: thermal runaway condition, second temperature-averaging condition, high temperature condition or low temperature condition, and first temperature-averaging condition.

[0222] This is determined based on the impact of various situations on the performance and life of the battery components. The basis for determination is not only theory, but also various actual test data. In this way, the battery components can be better maintained in good working condition and the impact on service life is relatively small.

[0223] Each module included in this embodiment can be implemented by a processor in a computer; of course, it can also be implemented by a logic circuit in a computer. The processor can be a general-purpose processor, a digital signal processor (DSP), a field programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. Among them, the general-purpose processor can be a central processing unit (CPU), a microprocessor (MPU) or any other conventional processor.

[0224] The description of the above device embodiment is similar to the description of the above method embodiment, and has similar beneficial effects as the method embodiment. For technical details not disclosed in the device embodiment of this application, please refer to the description of the method embodiment in this application for understanding.

[0225] Embodiment 4

[0226] This embodiment provides a computing device 800, which is applied to the battery assembly described in the first embodiment, referring to Fig.10 , the computing device 800 comprises: a storage component 801, a communication bus 802 and a processing component 803, wherein:

[0227] The storage component 801 is used to store the battery assembly control method program;

[0228] The communication bus 802 is used to realize the connection and communication between the storage component 801 and the processing component 803;

[0229] The processing component 803 is used to execute the battery assembly control method program to implement the steps of the method described in the second embodiment.

[0230] The type or structure of the storage component 801 can be found in the storage medium below, and will not be described in detail here.

[0231] The processing unit 803 may be a general-purpose processor, a digital signal processor (DSP), a field programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a central processing unit (CPU), a microprocessor (MPU), or any other conventional processor.

[0232] In some embodiments, the computing device 800 may further include: an input device 804, an output device 805, and an external communication interface 806, and these components are interconnected via a bus system and / or other forms of connection mechanisms (not shown in the figure). In this embodiment, the input device may be a network connector, an analog-to-digital converter, etc., and the output device may be a display, a speaker, etc.

[0233] The description of the computing device embodiment above is similar to the description of the method embodiment above, and has similar beneficial effects as the method embodiment. For technical details not disclosed in the computing device embodiment of this application, please refer to the description of the method embodiment in this application for understanding.

[0234] Embodiment 5

[0235] This embodiment provides a computer-readable storage medium, which is applied to the battery assembly described in the first embodiment. The computer-readable storage medium stores an executable program, and when the executable program is executed by a processor, the steps of the method described in the second embodiment are implemented.

[0236] Exemplarily, the computer-readable storage medium can adopt any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. The computer-readable storage medium is a tangible device that can hold and store instructions used by the instruction execution device. The readable storage medium can include, for example, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or devices, or any combination of the above. More specific examples (non-exhaustive list) of readable storage media include: portable computer disks, hard disks, random access memory (RAM, Random Access Memory), read-only memory (ROM, Read Only Memory), flash memory (Flash Memory), portable compact disc read-only memory (CD-ROM, Compact Disc Read-Only Memory), digital versatile disk (DVD, Digital Versatile Disc), memory stick, floppy disk, mechanical encoding device, such as a punch card or a protruding structure in a groove on which instructions are stored, and any suitable combination of the above. Wherein:

[0237] The RAM includes: static random access memory (SRAM), synchronous static random access memory (SSRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM, SyncLink Dynamic Random Access Memory), and direct RAM bus random access memory (DRRAM, Direct Rambus Random Access Memory).

[0238] The ROM includes: a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), and an electrically erasable programmable read-only memory (EEPROM).

[0239] The description of the above computer-readable storage medium embodiment is similar to the description of the above method embodiment, and has similar beneficial effects as the method embodiment. For technical details not disclosed in the computer-readable storage medium of this embodiment, please refer to the description of the method embodiment in this application for understanding.

[0240] It should be noted that the various embodiments provided in the embodiments of the present application belong to the same concept; the various technical features in the technical solutions recorded in the various embodiments can be arbitrarily combined to form new embodiments without conflict.

[0241] It should be understood that the above embodiments are exemplary and are not intended to include all possible implementations included in the claims. Various modifications and changes may be made on the basis of the above embodiments without departing from the scope disclosed in the present application. Similarly, the various technical features of the above embodiments may be arbitrarily combined to form other embodiments of the present application that may not be explicitly described. Therefore, the above embodiments only express several implementations of the present application and do not limit the scope of protection of the patent of this application.

Claims

1. A battery assembly, characterized in that: include: A box body having a containing space for containing the battery cell, the box body comprising a bottom plate and a cover plate, which are respectively located above and below the containing space; The battery core comprises a first battery core layer and a second battery core layer, wherein the first battery core layer is located in the accommodating space and abuts against the bottom plate; and the second battery core layer is located above the first battery core layer; The heat exchange plates include a first heat exchange plate located at the bottom of the first battery core layer, a second heat exchange plate located at the top of the second battery core layer, and a third heat exchange plate located between the first battery core layer and the second battery core layer; the heat exchange plates are provided with heat exchange channels for circulating heat exchange fluid; A connecting pipe, used to connect the heat exchange channels of each heat exchange plate and the outside, including a first pipe, a second pipe and a third pipe; the first pipe is used to connect the first heat exchange plate with the third heat exchange plate, the second pipe is used to connect the second heat exchange plate with the third heat exchange plate, and the third pipe is used to connect the third heat exchange plate with an external fluid inlet and outlet pipe; A pipeline control valve, used to control the on-off of each connecting pipeline; the pipeline control valve includes a first control valve arranged in the first pipe, a second control valve arranged in the second pipe and a third control valve arranged in the third pipe; The temperature sensor is used to collect the temperature of the battery cell, so as to control the operation of each pipeline control valve according to the collected temperature, thereby adjusting the temperature of the battery cell.

2. The battery assembly according to claim 1, characterized in that: The second pipe and the third pipe partially overlap; the second control valve is arranged at the portion of the second pipe that does not overlap with the third pipe.

3. The battery assembly according to claim 1, characterized in that: The third heat exchange plate is formed by extrusion of six series aluminum; the first heat exchange plate and the second heat exchange plate are formed by stamping of aluminum-manganese alloy.

4. A battery assembly control method, applied to the battery assembly according to any one of claims 1 to 3, characterized in that: The method comprises: Get the temperature of the battery cell collected by the temperature sensor; Determining the operating condition of the battery cell according to the temperature; According to the working condition of the battery cell, the operation of the first control valve, the second control valve and the third control valve are controlled respectively, thereby adjusting the temperature of the battery cell.

5. The battery assembly control method according to claim 4, characterized in that: Determining the operating condition of the battery cell according to the temperature includes: When the maximum temperature of the battery cell is greater than or equal to a first upper threshold, determining that the battery cell enters a high temperature operating condition; When the lowest temperature of the battery cell is less than or equal to a first lower threshold, determining that the battery cell enters a low temperature operating condition; When the maximum difference between the temperatures of the battery cells is greater than or equal to the first difference, determining that the battery cells enter a temperature equalization condition; When the temperature of the battery cell is abnormal and the voltage of the battery cell is also abnormal, determining that the battery cell enters a thermal runaway condition; Otherwise, it is determined that the battery cell is in a normal operating condition.

6. The battery assembly control method according to claim 5, characterized in that: According to the working condition of the battery cell, the operation of the first control valve, the second control valve and the third control valve are controlled respectively, thereby adjusting the temperature of the battery cell, including: When the operating condition of the battery cell is a high temperature condition and the maximum temperature is greater than or equal to the first upper threshold value but less than the second upper threshold value, the third control valve is opened and the first control valve and the second control valve are closed; When the operating condition of the battery cell is a high temperature condition and the highest temperature is greater than or equal to the second upper threshold, the third control valve, the first control valve and the second control valve are opened.

7. The battery assembly control method according to claim 5, characterized in that: According to the working condition of the battery cell, the operation of the first control valve, the second control valve and the third control valve are controlled respectively, thereby adjusting the temperature of the battery cell, including: When the operating condition of the battery cell is a low temperature condition and the lowest temperature is less than or equal to the first lower threshold value but greater than the second lower threshold value, the third control valve is opened and the first control valve and the second control valve are closed; When the operating condition of the battery cell is a low temperature condition and the lowest temperature is less than or equal to the second lower threshold, the third control valve, the first control valve and the second control valve are opened.

8. The battery assembly control method according to claim 5, characterized in that: According to the working condition of the battery cell, the operation of the first control valve, the second control valve and the third control valve are controlled respectively, thereby adjusting the temperature of the battery cell, including: When the working condition of the battery cell is the temperature-average working condition, the level of the temperature-average working condition is further determined; when the maximum difference between the temperatures is greater than or equal to the first difference but less than the second difference, it is the first temperature-average working condition; when the maximum difference between the temperatures is greater than or equal to the second difference, it is the second temperature-average working condition; In the first temperature-averaging condition, the third control valve is opened, and the first control valve and the second control valve are closed; In the second temperature-averaging condition, the third control valve, the first control valve and the second control valve are opened.

9. The battery assembly control method according to claim 5, characterized in that: According to the working condition of the battery cell, the operation of the first control valve, the second control valve and the third control valve are controlled respectively, thereby adjusting the temperature of the battery cell, including: When the operating condition of the battery cell is a thermal runaway condition, and the battery cell in the first battery layer is in the thermal runaway condition, the third control valve and the first control valve are opened, and the second control valve is closed; When the operating condition of the battery cell is a thermal runaway condition, and the battery cell in the second battery layer is in the thermal runaway condition, the third control valve and the second control valve are opened, and the first control valve is closed; When the operating condition of the battery cell is a thermal runaway condition, and both the first battery cell layer and the second battery cell layer have batteries in a thermal runaway state, the third control valve, the first control valve and the second control valve are opened.

10. The battery assembly control method according to claim 5, characterized in that: According to the working condition of the battery cell, the operation of the first control valve, the second control valve and the third control valve are controlled respectively, thereby adjusting the temperature of the battery cell, including: If the battery cell triggers multiple operating conditions at the same time, corresponding control is performed in the following order of priority: thermal runaway condition, second temperature-averaging condition, high temperature condition or low temperature condition, and first temperature-averaging condition.

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