Battery management system and battery module

Abstract

The utility model relates to a battery management system and a battery module. Comprising an environment temperature detection module, a cell temperature detection module and a work management detection module. Wherein the work management module is used for acquiring the environment temperature detected by the environment temperature detection module and the surface temperature detected by the battery cell temperature detection module, generating a working signal according to the surface temperature when the environment temperature is within a working temperature range, and transmitting the working signal to the battery cell; the battery cell is driven to work under the working current corresponding to the working signal, and the normal use of the battery cell is maintained; and when the environment temperature exceeds the working temperature range, the output of the working signal is stopped, so that the battery cell stops working, the change of the property of the electrolyte in the battery cell is prevented from influencing the capacity of releasing energy, the battery cell is protected, the battery cell is ensured to work at the proper environment temperature, and the better performance is maintained.

Description

Technical Field

[0001] This application relates to the field of battery management technology, and in particular to a battery management system and a battery module. Background Technology

[0002] Batteries are widely used in various industries. Some batteries contain liquid electrolytes, which can become viscous or even solidify at low temperatures, thus reducing the battery's ability to release energy and affecting its normal use. Utility Model Content

[0003] Therefore, it is necessary to provide a battery management system and battery module that can maintain the performance of the battery cells.

[0004] In a first aspect, a battery management system includes:

[0005] An ambient temperature detection module is used to detect the ambient temperature.

[0006] Cell temperature detection module, used to detect the surface temperature of the battery cell;

[0007] The operation management module is connected to both the ambient temperature detection module and the battery cell temperature detection module. The output of the operation management module is used to connect to the battery cell. The operation management module is used to acquire the ambient temperature and surface temperature, and when the ambient temperature is within the operating temperature range, it generates an operation signal to the battery cell based on the surface temperature, so that the battery cell operates with the operating current corresponding to the operation signal. The operation management module is also used to stop generating the operation signal when the ambient temperature exceeds the operating temperature range.

[0008] In one embodiment, the operation management module is also used to drive the battery cell to operate at the maximum operating current when the surface temperature is within a preset temperature range.

[0009] In one embodiment, when the ambient temperature is within the operating temperature range and the surface temperature is less than the lower limit of the preset temperature range, the operating current increases as the surface temperature increases.

[0010] When the ambient temperature is within the operating temperature range and the surface temperature is greater than the upper limit of the preset temperature, the operating current decreases as the surface temperature increases.

[0011] In one embodiment, the operating signal includes a discharge signal.

[0012] In one embodiment, the operating signal also includes a charging signal.

[0013] In one embodiment, when there are multiple battery cells, there are multiple battery cell temperature detection modules, and the number of battery cell temperature detection modules is the same as the number of battery cells. The multiple battery cell temperature detection modules detect the surface temperature of the multiple battery cells one by one.

[0014] In one embodiment, the battery management system further includes:

[0015] Reminder module;

[0016] The work management module is connected to the reminder module. The work management module is also used to drive the reminder module to perform reminder actions when the ambient temperature exceeds the working temperature range.

[0017] In one embodiment, the operating temperature range includes a charging allowable temperature range and a discharging allowable temperature range.

[0018] In one embodiment, the allowable charging temperature range is 0~55°C, and the allowable discharging temperature range is -20~60°C;

[0019] And / or,

[0020] The working management module is also used to drive the battery cell to work at the maximum operating current when the surface temperature is within the preset temperature range, which is 25~30℃.

[0021] Secondly, a battery module is provided, including battery cells and the aforementioned battery management system.

[0022] The aforementioned battery management system and battery module include an ambient temperature detection module, a cell temperature detection module, and a working management detection module. The working management module acquires the ambient temperature detected by the ambient temperature detection module and the surface temperature detected by the cell temperature detection module. When the ambient temperature is within the operating temperature range, it generates a working signal based on the surface temperature and transmits this signal to the cell to drive it to operate at the corresponding operating current, maintaining normal cell operation. When the ambient temperature exceeds the operating temperature range, it stops outputting the working signal, causing the cell to stop working. This prevents changes in the electrolyte properties within the cell from affecting its energy release capacity, protecting the cell and ensuring it operates at a suitable ambient temperature to maintain optimal performance. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is one of the structural block diagrams of a battery management system according to an embodiment;

[0025] Figure 2 A second structural block diagram of a battery management system according to an embodiment;

[0026] Figure 3 This is the third structural block diagram of a battery management system according to an embodiment. Detailed Implementation

[0027] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0029] It is understood that the term "connection" in the following embodiments should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have electrical signal or data transmission with each other.

[0030] It is understandable that "at least one" refers to one or more, and "multiple" refers to two or more. "At least a part of an element" refers to part or all of an element.

[0031] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising / including” or “having,” etc., specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Meanwhile, the term “and / or” as used in this specification includes any and all combinations of the associated listed items.

[0032] In one embodiment, a battery management system 10 is provided, including: an ambient temperature detection module 102, a cell temperature detection module 104, and a working management module 106.

[0033] The ambient temperature detection module 102 is used to detect the ambient temperature.

[0034] The ambient temperature refers to the temperature of the environment in which the battery cell is located. Therefore, the ambient temperature detection module 102 can be positioned close to the battery cell. Furthermore, the ambient temperature detection module 102 can also be positioned at a certain distance from the battery cell to reduce the impact of heat generated by the battery cell during operation and ensure that the temperature detected by the ambient temperature detection module 102 represents the temperature of the environment in which the battery cell is located.

[0035] The cell temperature detection module 104 is used to detect the surface temperature of the cell.

[0036] The cell temperature detection module 104 can be placed close to the cell to ensure accurate measurement of its surface temperature.

[0037] The operation management module 106 is connected to the ambient temperature detection module 102 and the cell temperature detection module 104 respectively. The output terminal of the operation management module 106 is used to connect to the cell. The operation management module 106 is used to acquire the ambient temperature and the surface temperature. When the ambient temperature is within the operating temperature range, it generates an operation signal to the cell based on the surface temperature so that the cell operates with the operating current corresponding to the operation signal. The operation management module 106 is also used to stop generating the operation signal when the ambient temperature exceeds the operating temperature range.

[0038] The operating temperature range can be understood as the range within which the ambient temperature falls, ensuring that the viscosity of the electrolyte within the battery cell does not significantly reduce its performance. For example, the viscosity of the electrolyte within the cell can support the release of more than 90% of the cell's total energy. Of course, the above is merely an example; the viscosity of the electrolyte within the cell can also support the release of 85%, 95%, or other values ​​exceeding the total energy of the cell, which will not be elaborated upon here.

[0039] When the ambient temperature is within the operating temperature range, it can be assumed that the electrolyte inside the battery cell will not become too viscous or solidify, and this temperature allows the cell to release energy. When the ambient temperature exceeds the operating temperature range, it can be assumed that the battery cell's performance will decrease, reducing its energy release capacity and affecting its normal use. Therefore, determining the battery cell's condition based on the ambient temperature ensures stable energy release during operation.

[0040] Therefore, the aforementioned battery management system 10 includes an ambient temperature detection module 102, a cell temperature detection module 104, and a working management detection module. The working management module 106 acquires the ambient temperature detected by the ambient temperature detection module 102 and the surface temperature detected by the cell temperature detection module 104. When the ambient temperature is within the working temperature range, it generates a working signal based on the surface temperature and transmits this signal to the cell to drive it to operate at the corresponding working current, maintaining normal cell operation. When the ambient temperature exceeds the working temperature range, it stops outputting the working signal to stop the cell from operating, preventing changes in the electrolyte properties within the cell from affecting its energy release capability, protecting the cell, and ensuring that the cell operates at a suitable ambient temperature to maintain good performance.

[0041] In one embodiment, the operation management module 106 is also used to drive the battery cell to operate at the maximum operating current when the surface temperature is within a preset temperature range.

[0042] The preset temperature range is the temperature range that can support the energy released by the battery cell to be 100% of the total energy of the battery cell. When the surface temperature is within this preset temperature range, the battery cell operates at the maximum operating current to obtain the maximum power.

[0043] In one embodiment, the battery cell can be an NV1260110-10000mAh lithium polymer battery, in which case the maximum operating current can be 1C. Of course, the maximum operating current corresponding to other specifications of battery cells can be determined according to the battery cell datasheet, and is not considered a specific limitation here.

[0044] In one embodiment, when the ambient temperature is within the operating temperature range and the surface temperature is less than the lower limit of the preset temperature range, the operating current increases as the surface temperature increases.

[0045] When the ambient temperature is within the operating temperature range and the surface temperature is greater than the upper limit of the preset temperature, the operating current decreases as the surface temperature increases.

[0046] When the ambient temperature is within the operating temperature range and the surface temperature is below the lower limit of the preset temperature range, the chemical reaction rate of the electrolyte within the cell decreases, thereby reducing the cell's discharge voltage and capacity. As the surface temperature increases, the chemical reaction rate of the electrolyte within the cell increases, leading to a greater discharge voltage and capacity. When the surface temperature is within the preset temperature range, the chemical reaction rate of the electrolyte within the cell reaches its maximum, and the cell's discharge voltage and capacity also reach their maximum. Further increases in surface temperature accelerate the aging process of the cell materials, resulting in accelerated capacity decay. In overheating conditions, this may even lead to thermal runaway, increasing the risk of fire and explosion. Therefore, the operating current varies with the cell's surface temperature to balance cell performance and safety.

[0047] In one embodiment, the operating signal includes a discharge signal.

[0048] The operation management module 106 is used to generate a discharge signal based on the surface temperature when the ambient temperature is within the operating temperature range, and transmit the discharge signal to the battery cell so that the battery cell discharges with the discharge current corresponding to the discharge signal.

[0049] like Figure 2 As shown, in one embodiment, the work management module 106 may further include a discharge module 1062 and a controller 1064.

[0050] The discharge module 1062 is connected to the controller 1064.

[0051] The controller 1064 is used to acquire the ambient temperature and surface temperature and transmit them to the discharge module 1062 so that the discharge module 1062 generates a discharge signal based on the surface temperature when the ambient temperature is within the operating temperature range; the controller 1064 is also used to receive the discharge signal and transmit the discharge signal to the battery cell.

[0052] At this point, the battery cell can be either a cell that only supports discharging or a cell that supports charging and discharging.

[0053] In one embodiment, the operating signal also includes a charging signal.

[0054] The operation management module 106 is used to generate a charging signal based on the surface temperature when the ambient temperature is within the operating temperature range, and transmit the charging signal to the battery cell so that the battery cell is charged with the charging current corresponding to the charging signal.

[0055] like Figure 2 As shown, in one embodiment, the work management module 106 may further include a charging module 1066.

[0056] The charging module 1066 is connected to the controller 1064.

[0057] The controller 1064 is used to acquire the ambient temperature and surface temperature and transmit them to the charging module 1066 so that the charging module 1066 generates a charging signal based on the surface temperature when the ambient temperature is within the operating temperature range; the controller 1064 is also used to receive the charging signal and transmit the charging signal to the battery cell.

[0058] At this point, the battery cell is one that can support charging and discharging.

[0059] In one embodiment, when there are multiple battery cells, there are multiple battery cell temperature detection modules 104, and the number of battery cell temperature detection modules 104 is the same as the number of battery cells. The multiple battery cell temperature detection modules 104 detect the surface temperature of the multiple battery cells one by one.

[0060] Generally, a battery consists of multiple cells. When there are multiple cells, the same number of cell temperature detection modules 104 can be set up to detect the surface temperature of each cell.

[0061] When the ambient temperature is within the operating temperature range, the operation management module 106 can perform data processing such as averaging on the surface temperature of each cell, determine the operating signal, and transmit the operating signal to each cell so that each cell operates with the same operating current corresponding to the operating signal.

[0062] When the ambient temperature is within the operating temperature range, the operation management module 106 can also determine a corresponding operating signal based on the surface temperature of each cell and transmit the operating signal to the corresponding cell to achieve precise cell control.

[0063] In one embodiment, such as Figure 3 As shown, the battery management system 10 also includes a reminder module 108.

[0064] The work management module 106 is connected to the reminder module 108. The work management module 106 is also used to drive the reminder module 108 to perform a reminder action when the ambient temperature exceeds the working temperature range.

[0065] When the ambient temperature exceeds the operating temperature range, the battery cell stops working, and a reminder message can be sent to the user via the reminder module 108.

[0066] Specifically, the reminder module 108 can be an audible and visual alarm module, which can realize audible and visual alarms through devices such as buzzers and light bulbs. The reminder module 108 can also be a terminal device that can pop up windows and receive information. Of course, the reminder module 108 can also be other modules that provide reminders in other ways, which will not be elaborated here.

[0067] In one embodiment, the operating temperature range includes a charging allowable temperature range and a discharging allowable temperature range.

[0068] When the operating signal includes a charging signal, the operating temperature range includes the allowable charging temperature range. When the operating signal includes a discharging signal, the operating temperature range includes the allowable discharging temperature range. The temperature range values ​​corresponding to the allowable charging temperature range may completely or partially overlap with the temperature range values ​​corresponding to the allowable discharging temperature range.

[0069] In one embodiment, as shown in the table below, the allowable charging temperature range is 0~55℃, and the allowable discharging temperature range is -20~60℃.

[0070] And / or,

[0071] The operation management module 106 is also used to drive the battery cell to operate at the maximum operating current when the surface temperature is within the preset temperature range, where the preset temperature range is 25~30℃.

[0072]

[0073] The lower limit of the allowable discharge temperature range is lower than the lower limit of the allowable charging temperature range, which ensures that the cell can still discharge in low-temperature environments, but the cell can only be charged after the temperature rises. The upper limit of the allowable discharge temperature range is higher than the upper limit of the allowable charging temperature range, which ensures that the cell can still discharge in high-temperature environments, but the cell can only be charged after the temperature falls back, thus maintaining the performance of the cell.

[0074] In one embodiment, the work management module 106 is used to obtain the ambient temperature within a preset time period.

[0075] When the ambient temperature fluctuates significantly, the ambient temperature can be averaged and processed within a preset time period to determine a reliable ambient temperature. This avoids the repeated generation or cessation of working signals under short-term heat changes, thus improving the battery management system 10.

[0076] In one embodiment, multiple ambient temperature detection modules 102 can be provided, and each ambient temperature detection module 102 is located at different positions around the battery cell.

[0077] The work management module 106 acquires the ambient temperature from different directions, performs numerical processing such as averaging on each ambient temperature, determines a new ambient temperature, and then matches this ambient temperature with the working temperature range to improve the accuracy of the timing of work signal generation.

[0078] The simultaneous detection by multiple ambient temperature detection modules 102 can also improve the fault tolerance of ambient temperature detection. Even if some ambient temperature detection modules 102 fail, the battery management system 10 can still determine the ambient temperature.

[0079] In one embodiment, a battery module is provided, including battery cells and the aforementioned battery management system.

[0080] Battery modules equipped with a battery management system can automatically detect ambient temperature and cell surface temperature. They can determine the cell's operating status based on ambient temperature and the cell's operating current based on surface temperature, thereby maintaining the normal operation of the battery module.

[0081] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0082] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0083] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A battery management system, characterized by, The battery management system comprises: an ambient temperature detection module configured to detect an ambient temperature; a cell temperature detection module configured to detect a surface temperature of a cell; a working management module connected to the ambient temperature detection module and the cell temperature detection module, and having an output end connected to the cell; the working management module is configured to acquire the ambient temperature and the surface temperature, and generate a working signal to the cell according to the surface temperature when the ambient temperature is within a working temperature range, so that the cell works at a working current corresponding to the working signal; the working management module is further configured to stop generating the working signal when the ambient temperature is out of the working temperature range.

2. The battery management system of claim 1, wherein, the working management module is further configured to drive the cell to work at a maximum working current when the surface temperature is within a preset temperature range.

3. The battery management system of claim 2, wherein, the working current increases with the increase of the surface temperature when the ambient temperature is within the working temperature range and the surface temperature is less than a lower limit value of the preset temperature range; the working current decreases with the increase of the surface temperature when the ambient temperature is within the working temperature range and the surface temperature is greater than an upper limit value of the preset temperature range.

4. The battery management system of claim 1, wherein, the working signal comprises a discharging signal.

5. The battery management system of claim 4, wherein, the working signal further comprises a charging signal.

6. The battery management system of claim 1, wherein, when there are a plurality of cells, the cell temperature detection module is also a plurality, and the number of the cell temperature detection modules is the same as the number of the cells, and each of the cell temperature detection modules corresponds to one of the cells to detect the surface temperature of the cell.

7. The battery management system of claim 1, wherein, The battery management system further comprises: a reminding module; the working management module is connected to the reminding module, and the working management module is further configured to drive the reminding module to perform a reminding action when the ambient temperature is out of the working temperature range.

8. The battery management system of any one of claims 1-7, wherein, the working temperature range comprises a charging allowable temperature range and a discharging allowable temperature range.

9. The battery management system of claim 8, wherein, the charging allowable temperature range is 0-55℃, and the discharging allowable temperature range is -20-60℃. and / or, when the working management module is further configured to drive the cell to work at the maximum working current when the surface temperature is within the preset temperature range, the preset temperature range is 25-30℃.

10. A battery module, characterized by The battery management system comprises a cell and any one of claims 1-9.

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