Battery system, vehicle, and control method of battery system

Abstract

The application relates to a battery system, a vehicle and a control method of the battery system, wherein the battery system comprises a battery cell group, an acquisition unit, a control unit and a driving unit; the acquisition unit and the driving unit are connected with the battery cell group; the acquisition unit is used for acquiring pressure detection data of a battery cell gap in the battery cell group and sending the pressure detection data to the control unit; the control unit is used for determining a pressure value of the battery cell gap according to the received pressure detection data and generating a control signal according to the pressure value and sending the control signal to the driving unit; and the driving unit is used for adjusting the pressure value of the battery cell gap in response to the control signal, so that the pressure borne by the battery cell can be accurately and dynamically adjusted.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery system, a vehicle, and a method for controlling the battery system. Background Technology

[0002] Solid-state batteries employ a solid-solid contact interface, requiring appropriate externally applied stacking pressure to maintain a tight interface adhesion. This ensures unobstructed ion conduction pathways and reduces interfacial impedance. Simultaneously, during charging and discharging, the volume expansion and contraction of the electrode materials also rely on external pressure to constrain these processes, maintaining the consistency and stability of the cell structure and preventing uneven pressure distribution that could lead to casing deformation. Therefore, pressure management is crucial for the performance and lifespan of solid-state batteries.

[0003] Existing battery pressure management solutions typically involve placing end plates at both ends of the cell assembly and applying constant pressure to both ends of the module via external hydraulic pressure or bolts. However, this method cannot precisely and dynamically adjust the pressure exerted on the cells.

[0004] There is currently no effective solution to the problem of the inability to precisely and dynamically adjust the pressure on the battery cell in related technologies. Summary of the Invention

[0005] This embodiment provides a control method for a battery system, a vehicle, and a battery system, which aims to precisely and dynamically adjust the pressure on the battery cells.

[0006] In a first aspect, this embodiment provides a battery system, which includes a battery cell pack, a data acquisition unit, a control unit, and a drive unit; both the data acquisition unit and the drive unit are connected to the battery cell pack.

[0007] The acquisition unit is used to acquire pressure detection data of the gap between the cells in the cell group and send the pressure detection data to the control unit.

[0008] The control unit is configured to determine the pressure value of the cell gap based on the received pressure detection data, generate a control signal based on the pressure value, and send the control signal to the drive unit.

[0009] The drive unit is used to adjust the pressure value of the cell gap in response to the control signal.

[0010] Secondly, this embodiment provides a vehicle that includes the battery system described in the first aspect above.

[0011] Thirdly, this embodiment provides a control method for a battery system, the control method comprising:

[0012] Acquire pressure detection data of the gaps between cells in the cell pack within the battery system;

[0013] Based on the pressure detection data, the pressure value of the cell gap is determined;

[0014] A control signal is generated based on the pressure value, and the pressure value of the cell gap is adjusted based on the control signal.

[0015] Compared with related technologies, this embodiment provides a battery system, a vehicle, and a control method for the battery system. The battery system includes a cell pack, a data acquisition unit, a control unit, and a drive unit. Both the data acquisition unit and the drive unit are connected to the cell pack. The data acquisition unit acquires pressure detection data of the gaps between the cells in the cell pack and sends the pressure detection data to the control unit. The control unit determines the pressure value of the cell gap based on the received pressure detection data and generates a control signal based on the pressure value, sending the control signal to the drive unit. The drive unit adjusts the pressure value of the cell gap in response to the control signal. Thus, by having the data acquisition unit monitor the pressure changes of the cell gap in real time, and the control unit dynamically generates a control signal based on the pressure detection data, the drive unit adjusts the pressure value of the cell gap in response to the control signal, thereby enabling precise and dynamic adjustment of the pressure on the cells.

[0016] Details of one or more embodiments of this application are set forth in the following drawings and description to make other features, objects and advantages of this application more readily apparent. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0018] Figure 1 This is a schematic diagram of the structure of the battery system according to Embodiment 1 provided in this application;

[0019] Figure 2 This is a schematic diagram of the structure of the battery system according to Embodiment 2 provided in this application;

[0020] Figure 3 This is a schematic diagram of the Wheatstone bridge provided in this application;

[0021] Figure 4 This is a schematic diagram of the structure of the battery system according to Embodiment 3 provided in this application;

[0022] Figure 5 This is a flowchart illustrating the control method based on a magnetically controlled force-applying component provided in this application;

[0023] Figure 6This is a schematic diagram of the structure of the battery system according to Embodiment 4 provided in this application;

[0024] Figure 7 This is a flowchart of the control method for the battery system provided in this application;

[0025] Figure 8 This is a structural block diagram of the control device for the battery system provided in this application.

[0026] Reference numerals: 1. Battery cell assembly; 11. Pressure detection unit; 12. Magnetically controlled force application component; 2. Acquisition unit; 21. Wheatstone bridge; 22. Acquisition circuit; 3. Control unit; 4. Drive unit; 5. Power supply unit; 100. Receiving module; 200. Calculation module; 300. Control module. Detailed Implementation

[0027] To better understand the purpose, technical solution, and advantages of this application, the application is described and illustrated below in conjunction with the accompanying drawings and embodiments.

[0028] Unless otherwise defined, the technical or scientific terms used in this application shall have the general meaning understood by one of ordinary skill in the art to which this application pertains. Words such as “a,” “an,” “an,” “the,” “the,” and “these” used in this application do not indicate quantitative limitation and may be singular or plural. The terms “comprising,” “including,” “having,” and any variations thereof used in this application are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that comprises a series of steps or modules (units) is not limited to the listed steps or modules (units) but may include steps or modules (units) not listed, or may include other steps or modules (units) inherent to these processes, methods, products, or devices. Words such as “connected,” “linked,” and “coupled” used in this application are not limited to physical or mechanical connections but may include electrical connections, whether direct or indirect. “Multiple” used in this application refers to two or more. “And / or” describes the relationship between related objects, indicating that three relationships may exist; for example, “A and / or B” can represent: A alone, A and B simultaneously, and B alone. Normally, the character " / " indicates that the objects before and after it are in an "or" relationship. The terms "first," "second," "third," etc., used in this application are merely to distinguish similar objects and do not represent a specific order of objects.

[0029] The following specific embodiments are given to illustrate the technical solution of this application in detail.

[0030] Figure 1 This is a schematic diagram of the structure of a battery system according to a first embodiment of this application. Please refer to [link / reference]. Figure 1 The battery system provided in this embodiment includes: a cell pack 1, a data acquisition unit 2, a control unit 3, and a drive unit 4; both the data acquisition unit 2 and the drive unit 4 are connected to the cell pack 1.

[0031] Acquisition unit 2 is used to acquire pressure detection data of the gap between the cells in cell group 1 and send the pressure detection data to control unit 3;

[0032] The control unit 3 is used to determine the pressure value of the cell gap based on the received pressure detection data, and generate a control signal based on the pressure value to send the control signal to the drive unit 4.

[0033] Drive unit 4 is used to adjust the pressure value of the cell gap in response to the control signal.

[0034] In the battery system, cell pack 1 is composed of multiple stacked cells, with gaps formed between adjacent cells. Both acquisition unit 2 and drive unit 4 are connected to cell pack 1. Acquisition unit 2 is connected to pressure detection unit 11 to acquire pressure detection data from the cell gaps, enabling real-time sensing of the pressure currently experienced by the cells. Drive unit 4 is connected to adjustment components deployed corresponding to the cell gaps, driving these components to adjust the pressure value of the cell gaps.

[0035] Specifically, when the control unit 3 receives the pressure detection data sent by the acquisition unit 2, it calculates the current pressure value of the cell gap based on the pressure detection data and compares this pressure value with a preset target pressure value. If the pressure value deviates from the target pressure value, the control unit 3 generates a corresponding control signal based on the deviation of the pressure value from the target pressure value and sends the control signal to the drive unit 4. The control unit 3 can be deployed independently or integrated into the main control board of the Battery Management System (BMS). For example, the control unit 3 can be a microcontroller (MCU), etc., but this embodiment does not specifically limit its use.

[0036] It should be noted that a pressure detection unit 11 may be provided within the cell gap. The pressure detection unit 11 is used to collect pressure-related data of the cell. The pressure detection data is determined based on this pressure-related data. For example, in one embodiment, the pressure detection unit 11 may be a fiber Bragg grating (FBG) sensor. The pressure detection unit 11 is embedded in either cell on either side of the cell gap. In this case, the pressure change of the cell can be obtained by monitoring the Bragg wavelength drift of the FBG sensor. Specifically, the FBG sensor outputs a reflected light signal to the acquisition unit 2. The acquisition unit 2 demodulates the reflected light signal to obtain the demodulation result of the Bragg wavelength, and sends the demodulation result as pressure monitoring data to the control unit 3, so that the control unit 3 can calculate the pressure value of the cell gap based on the demodulation result.

[0037] After receiving the control signal, the drive unit 4 outputs the required drive signal to the regulating component to drive the regulating component to adjust the pressure value between the battery cells. For example, it can drive the regulating component to change its own stiffness or deformation to adjust the contact pressure between the battery cells and thus control the pressure value between the battery cells.

[0038] The battery system provided in this embodiment specifically includes a cell assembly 1, a data acquisition unit 2, a control unit 3, and a drive unit 4. Both the data acquisition unit 2 and the drive unit 4 are connected to the cell assembly 1. The data acquisition unit 2 acquires pressure detection data of the gaps between the cells in the cell assembly 1 and sends this data to the control unit 3. The control unit 3 determines the pressure value of the cell gap based on the received pressure detection data and generates a control signal based on the pressure value, sending the control signal to the drive unit 4. The drive unit 4 adjusts the pressure value of the cell gap in response to the control signal. Thus, by having the data acquisition unit 2 monitor the pressure changes of the cell gap in real time, and the control unit 3 dynamically generates a control signal based on the pressure detection data, and the drive unit 4 adjusts the pressure value of the cell gap in response to this control signal, the pressure on the cells can be precisely and dynamically adjusted, ensuring that the cells are within the optimal pressure range and effectively adapting to conditions such as charge / discharge expansion, temperature changes, and aging.

[0039] In some embodiments, the acquisition unit 2 includes a Wheatstone bridge 21 and an acquisition circuit 22.

[0040] The Wheatstone bridge 21 is used to collect the resistance value of the pressure detection unit 11 within the cell gap;

[0041] The Wheatstone bridge 21 is also used to convert the resistance value into a differential voltage signal and output the differential voltage signal to the acquisition circuit 22;

[0042] The acquisition circuit 22 is used to determine the differential voltage value based on the differential voltage signal, and to determine the pressure detection data based on the differential voltage value.

[0043] See Figure 2 In this embodiment, the acquisition unit 2 includes a Wheatstone bridge 21 and an acquisition circuit 22, which are used to acquire and convert the pressure-related data output by the pressure detection unit 11. For example, the pressure detection unit 11 uses a thin-film pressure sensor, whose output is a resistance value that is inversely proportional to the magnitude of the contact pressure. In this case, the pressure detection unit 11 is located in the gap between the battery cells.

[0044] In specific implementation, the Wheatstone bridge 21 is used to acquire the resistance value of the pressure detection unit 11 located in the gap between the battery cells, and converts the resistance value into a differential voltage signal and outputs it to the acquisition circuit 22. Specifically, the Wheatstone bridge 21 connects the resistance of the pressure sensor to one arm of the bridge. When the sensor resistance changes with the contact pressure, a differential voltage signal corresponding to the resistance change is generated between the two output terminals of the bridge.

[0045] After the differential voltage signal is processed by the acquisition circuit 22, the corresponding differential voltage value is obtained, and this differential voltage value is sent to the control unit 3 as pressure detection data. The acquisition circuit 22 can be a differential acquisition circuit, an AD acquisition circuit (including a multi-channel ADC chip), etc.

[0046] It should be understood that in a Wheatstone bridge, the outputs at the two output terminals are respectively , Differential voltage value It changes with the resistance of the bridge arms. For details, please refer to [link / reference]. Figure 3 If the resistances of the four arms of the bridge are respectively The excitation voltage is The outputs of the two output terminals are respectively , .

[0047] For ease of description and understanding, this example uses R as the first preset initial resistance value for each arm of the Wheatstone bridge 21 and the second preset initial resistance value for the pressure detection unit 11. The Wheatstone bridge 21 outputs a differential voltage signal. , .in, This indicates the excitation voltage of the Wheatstone bridge 21, i.e., the supply voltage applied across the bridge. This indicates the actual resistance change of the pressure detection unit 11. At this time, the current differential voltage value... Since the initial differential voltage of Wheatstone bridge 21 is 0 under no-pressure conditions, This refers to pressure measurement data.

[0048] It should be noted that in practical applications, the first preset initial resistance value of each arm resistor in the Wheatstone bridge 21 is usually different from the second preset initial resistance value of the pressure detection unit 11. The first preset initial resistance value of each arm resistor in the Wheatstone bridge 21 is R1, while the second preset initial resistance value of the pressure detection unit 11 is R2. Under no-pressure conditions, , The initial differential voltage value After a pressure change occurs, , Then the current differential voltage value .in, This indicates the excitation voltage of the Wheatstone bridge 21, i.e., the supply voltage applied across the bridge. This indicates the actual resistance change of the pressure detection unit 11. At this time, , This refers to pressure measurement data.

[0049] In this way, the Wheatstone bridge 21 and the acquisition circuit 22 convert the pressure-related data output by the pressure detection unit 11 into pressure detection data that can be recognized by the control unit 3, thereby realizing the accurate sensing and output of the contact pressure in the gap between the battery cells.

[0050] In some embodiments, determining the pressure value of the cell gap based on the received pressure detection data includes:

[0051] The actual resistance change of the pressure detection unit 11 is determined based on the differential voltage value, the first preset initial resistance value of each arm resistor in the Wheatstone bridge 21, and the second preset initial resistance value of the pressure detection unit 11.

[0052] The pressure value corresponding to the actual resistance change is determined based on the actual resistance change and the preset relationship between the resistance change and the pressure value.

[0053] The pressure value corresponding to the actual resistance change is determined as the pressure value of the cell gap.

[0054] Specifically, the pressure detection unit 11 (e.g., a thin-film pressure sensor) is connected as a resistive sensing element to one arm of the Wheatstone bridge 21, and its resistance value changes with the contact pressure. The other arms of the Wheatstone bridge 21 are fixed resistors with known resistance values. When the resistance of the pressure detection unit 11 changes, the differential voltage output by the bridge also changes accordingly.

[0055] Based on the differential voltage value, the first preset initial resistance value of each arm resistor in the Wheatstone bridge 21, and the second preset initial resistance value of the pressure detection unit 11, the control unit 3 can reverse calculate the actual resistance change of the pressure detection unit 11.

[0056] It should be noted that the first preset initial resistance value of each bridge arm resistor may be the same or different, and the first preset initial resistance value and the second preset initial resistance value are determined based on the actual application conditions of the battery system. In actual engineering, those skilled in the art can select a Wheatstone bridge 21 with the same or similar first preset initial resistance value and second preset initial resistance value.

[0057] For ease of description and understanding, we will use R as an example, where the first preset initial resistance value of each arm of the Wheatstone bridge 21 and the second preset initial resistance value of the pressure detection unit 11 are both R. The specific formula that can be used for reverse calculation is as follows:

[0058] (1)

[0059] In equation (1), Indicates the differential voltage value; This indicates the excitation voltage of the Wheatstone bridge 21, i.e., the supply voltage applied across the bridge. This represents the actual resistance change. Based on equation (1) above, control unit 3 can then calculate the actual resistance change. .

[0060] It should be noted that, in practical applications, the first preset initial resistance value of each arm resistor in the Wheatstone bridge 21 is usually different from the second preset initial resistance value of the pressure detection unit 11. In this case, when the pressure detection unit 11 is in its initial state (i.e., no pressure state), the differential voltage value... Satisfy the following formula:

[0061] (2)

[0062] In equation (2), R1 represents the excitation voltage of the Wheatstone bridge 21, i.e., the supply voltage applied to both ends of the bridge; R2 represents the first preset initial resistance value of each arm resistor in the Wheatstone bridge 21; R2 represents the second preset initial resistance value of the pressure detection unit 11.

[0063] When the contact pressure changes, the resistance value of the pressure detection unit 11 changes. Differential voltage value Satisfy the following formula:

[0064] (3)

[0065] In equation (3), R1 represents the excitation voltage of the Wheatstone bridge 21, i.e., the supply voltage applied to both ends of the bridge; R2 represents the first preset initial resistance value of each arm resistor in the Wheatstone bridge 21; R2 represents the second preset initial resistance value of the pressure detection unit 11. This indicates the actual change in resistance at this point.

[0066] thus, ,according to The calculation formulas, equations (2) and (3) can be used to calculate the actual resistance change. .

[0067] Furthermore, the control unit 3 retrieves the pressure value corresponding to the actual resistance change based on the pre-stored correspondence between resistance change and pressure value, and determines this pressure value as the pressure value of the cell gap. The correspondence between resistance change and pressure value is obtained through pre-testing and calibration of the device characteristics of the pressure detection unit 11, for use during testing.

[0068] Thus, by back-calculating the resistance change of the pressure detection unit 11 based on the differential voltage value, the first preset initial resistance value of each arm resistor in the Wheatstone bridge 21, and the second preset initial resistance value of the pressure detection unit 11, the pressure value of the current cell gap can be accurately calculated based on the resistance change.

[0069] In some embodiments, adjusting the pressure value of the cell gap in response to a control signal includes:

[0070] In response to the control signal, the magnetically controlled force application element 12 deployed in the cell gap is deformed to adjust the pressure value of the cell gap.

[0071] In this embodiment, a magnetically controlled force-applying element 12 can be arranged within each cell gap, and the number of magnetically controlled force-applying elements 12 can be one or more. The magnetically controlled force-applying element 12 is used to apply pressure to the cell set associated with the magnetically controlled force-applying element 12, and the cell set includes at least two adjacent cells on both sides of the cell gap where the magnetically controlled force-applying element 12 is located. At the same time, a pressure detection unit 11 is also correspondingly provided within the cell set associated with the magnetically controlled force-applying element 12, and the pressure detection unit 11 is used to collect pressure-related data of the cells within the cell set.

[0072] See Figure 4 Both the acquisition unit 2 and the drive unit 4 are connected to the cell assembly 1. The acquisition unit 2 is connected to the pressure detection unit 11 to acquire pressure detection data between the cells, enabling real-time sensing of the current pressure on the cells. This pressure detection data is determined based on pressure-related data of the cells. The drive unit 4 is connected to the magnetically controlled force application component 12 to drive the component to deform.

[0073] In practice, after receiving the control signal, the drive unit 4 outputs the required drive signal to the magnetically controlled force-applying component 12 to drive the magnetically controlled force-applying component 12 to deform, thereby changing the pressure applied by the magnetically controlled force-applying component 12 to its associated cell assembly, so as to adjust the pressure value of the cell gap.

[0074] It should be noted that the magnetically controlled force application component 12 can be a magnetostrictive component or a combination of an electromagnet and an elastomer, etc., without specific limitations. For example, the magnetically controlled force application component 12 includes a first electromagnet, an elastomer, and a second electromagnet stacked sequentially. Another example is that the magnetically controlled force application component 12 includes an electromagnet, an elastomer, and a permanent magnet stacked sequentially. Simultaneously, the driving unit 4 is adapted to the magnetically controlled force application component 12, that is, the specific architecture of the driving unit 4 and its output signal match the specific implementation of the magnetically controlled force application component 12, to ensure that the driving unit 4 can accurately drive the magnetically controlled force application component 12 according to the received control signal.

[0075] The method provided in this embodiment monitors the pressure changes between battery cells in real time through the acquisition unit 2, and the control unit 3 dynamically generates a control signal based on the pressure detection data. The drive unit 4 responds to the control signal by causing the magnetically controlled force-applying component 12 to deform accordingly, thereby enabling precise and dynamic adjustment of the pressure on the battery cells. Simultaneously, based on the distributed arrangement of the magnetically controlled force-applying components 12, fine-grained independent control of each battery cell assembly can be achieved. Each magnetically controlled force-applying component 12 can adjust the pressure according to the actual stress state of its associated battery cell assembly, thus providing precise compensation for different battery cells. Furthermore, by applying pressure directly to a local area of ​​the battery cell assembly, without relying on the end plate to transmit force through the entire battery cell stack, the problem of pressure loss in the middle caused by the accumulation of stacking tolerances in long-distance force transmission paths can be effectively solved.

[0076] In some embodiments, generating a control signal based on a pressure value includes:

[0077] When the detected pressure value is greater than the maximum pressure value in the preset pressure range, a first control signal is generated based on the pressure value; the first control signal is used to instruct the drive unit 4 to drive the magnetically controlled force application element 12 to deform in the direction away from the adjacent cell of the magnetically controlled force application element 12.

[0078] When the pressure value is detected to be less than the minimum pressure value in the preset pressure range, a second control signal is generated based on the pressure value; the second control signal is used to instruct the drive unit 4 to drive the magnetically controlled force application member 12 to deform in the direction of the adjacent cell closer to the magnetically controlled force application member 12.

[0079] For details, please refer to Figure 5After determining the pressure value of the cell gap based on the pressure detection data, the control unit 3 compares the pressure value with a preset pressure range to determine whether the current pressure is within the preset pressure range. The preset pressure range includes an upper limit (i.e., the maximum pressure value) and a lower limit (i.e., the minimum pressure value), and its specific values ​​can be determined according to the characteristics of the cell used.

[0080] For example, in one embodiment, the preset pressure range is 5~15 MPa. Within this range, the solid-solid interface of the battery cell can maintain a tight fit, and the ionic conductivity and cycle stability can be well guaranteed. It should be noted that this numerical range is only illustrative, and those skilled in the art can flexibly set the pressure range according to actual application requirements.

[0081] When the detected pressure value exceeds the maximum pressure value in the preset pressure range, it indicates that the pressure at the cell gap is too high. At this time, the control unit 3 generates a first control signal, which instructs the drive unit 4 to drive the magnetically controlled force-applying member 12 to deform in the direction away from the adjacent cell (i.e., the width of the magnetically controlled force-applying member 12 along the cell arrangement direction decreases), thereby reducing the pressure applied to the cell assembly.

[0082] When the detected pressure value is less than the minimum pressure value in the preset pressure range, it indicates that the pressure at the gap between the cells is insufficient. At this time, the control unit 3 generates a second control signal, which is used to instruct the drive unit 4 to drive the magnetically controlled force-applying member 12 to deform in the direction of the adjacent cell closer to the magnetically controlled force-applying member 12 (i.e., the width of the magnetically controlled force-applying member 12 increases along the cell arrangement direction), thereby increasing the pressure applied to the cell assembly.

[0083] Furthermore, if it is detected that the current pressure is within the preset pressure range, there is no need to drive the magnetic force application component 12, and the pressure value continues to be monitored.

[0084] Thus, by comparing the real-time detected pressure value with the preset pressure range, and generating a corresponding control signal based on the comparison result, the magnetic force application component 12 is driven to deform in the direction away from or close to the adjacent battery cell, thereby achieving dynamic adjustment of the battery cell gap pressure and ensuring that the pressure in the battery cell gap is always maintained within the preset safe pressure range.

[0085] In some embodiments, the driving unit 4 is further configured to determine the driving current output by the driving unit 4 to the magnetically controlled force-applying member 12 according to the control signal; the driving unit 4 is further configured to output the driving current to the magnetically controlled force-applying member 12 to drive the magnetically controlled force-applying member 12 to deform; wherein, the current direction of the driving current is used to control the magnetically controlled force-applying member 12 to deform in the direction close to the adjacent cell of the magnetically controlled force-applying member 12 or in the direction away from the adjacent cell of the magnetically controlled force-applying member 12, and the current magnitude of the driving current is used to control the deformation of the magnetically controlled force-applying member 12.

[0086] Specifically, after receiving the control signal sent by the control unit 3, the drive unit 4 determines the drive current that it needs to output to the magnetically controlled force application component 12 according to the control signal, and outputs the drive current to the magnetically controlled force application component 12 to drive the magnetically controlled force application component 12 to undergo corresponding deformation.

[0087] The direction of the driving current is used to control the deformation direction of the magnetically controlled force-applying component 12. When it is necessary to increase the applied pressure, the driving unit 4 outputs a corresponding driving current, causing the magnetically controlled force-applying component 12 to deform towards the adjacent battery cell (i.e., the width along the battery cell arrangement direction increases); when it is necessary to decrease the applied pressure, the driving unit 4 outputs a driving current in a second direction, causing the magnetically controlled force-applying component 12 to deform towards the adjacent battery cell away from the magnetically controlled force-applying component 12 (i.e., the width along the battery cell arrangement direction decreases). The first direction and the second direction are two opposite current directions.

[0088] The magnitude of the driving current is used to control the deformation of the magnetically controlled force-applying component 12. When the driving current is larger, the magnetic force is stronger, the deformation of the magnetically controlled force-applying component 12 is larger, and the pressure applied by the magnetically controlled force-applying component 12 is also greater; when the driving current is smaller, the magnetic force is weaker, the deformation of the magnetically controlled force-applying component 12 is smaller, and the pressure applied by the magnetically controlled force-applying component 12 is correspondingly reduced.

[0089] Thus, by adjusting the direction and magnitude of the driving current output to the magnetically controlled force-applying component 12, the drive unit 4 precisely controls the deformation direction and deformation of the magnetically controlled force-applying component 12, thereby achieving precise adjustment of the pressure applied by the magnetically controlled force-applying component 12.

[0090] In some embodiments, the control signal includes a level signal and a pulse width modulation signal; the drive unit 4 is further configured to determine a first drive current output by the drive unit 4 to the magnetically controlled force application member 12 according to the control signal; wherein the current direction of the first drive current is determined according to the level state of the level signal, and the current magnitude of the first drive current is determined according to the duty cycle of the pulse width modulation signal.

[0091] Specifically, the control signal consists of two parts: a level signal and a pulse width modulation (PWM) signal. Both work together on the drive unit 4 to precisely control the drive current output by the drive unit 4. Upon receiving the control signal, the drive unit 4 determines the direction of the first drive current based on the level state of the level signal, and simultaneously determines the magnitude of the first drive current based on the duty cycle of the PWM signal.

[0092] Taking the magnetically controlled force-applying component 12, which employs a combination structure of electromagnets, elastic bodies, and permanent magnets stacked sequentially, and the driving unit 4 using an H-bridge driving circuit as an example, the H-bridge driving circuit receives a level signal (which includes two logic control signals) and controls the conduction combination of its internal switching transistors according to the level signal, thereby changing the direction of the current flowing through the electromagnet coil. When the H-bridge driving circuit outputs a driving current in the first direction, the electromagnet and the permanent magnet repel each other, increasing the width of the magnetically controlled force-applying component 12 along the cell arrangement direction, thus increasing the pressure applied by the magnetically controlled force-applying component 12. When the H-bridge driving circuit outputs a driving current in the second direction, the electromagnet and the permanent magnet attract each other, decreasing the width of the magnetically controlled force-applying component 12 along the cell arrangement direction, thus decreasing the pressure applied by the magnetically controlled force-applying component 12. The first and second directions are two opposite current directions.

[0093] Meanwhile, the duty cycle of the pulse width modulation signal determines the effective or average value of the first drive current, thereby controlling the deformation of the magnetically controlled force application component 12.

[0094] In this way, by using level signals and pulse width modulation signals to control the direction and magnitude of the first driving current respectively, precise and rapid control of the deformation direction and deformation of the magnetic force application component 12 is achieved, significantly improving the response speed and control accuracy of the pressure regulation of the battery cell assembly 1.

[0095] In some embodiments, the battery system further includes a power supply unit 5; the power supply unit 5 is connected to the control unit 3 and the drive unit 4 respectively; the control signal includes a level signal and a voltage regulation signal.

[0096] The control unit 3 is also used to send a voltage regulation signal to the power supply unit 5 so that the power supply unit 5 can regulate the power supply voltage output by the power supply unit 5 to the drive unit 4.

[0097] The driving unit 4 is also used to determine the second driving current output by the driving unit 4 to the magnetically controlled force application element 12 according to the level signal and the power supply voltage; wherein, the current direction of the second driving current is determined according to the level state of the level signal, and the current magnitude of the second driving current is determined according to the power supply voltage.

[0098] See Figure 6The battery system in this embodiment also includes a power supply unit 5 (e.g., a digital power supply or a programmable power supply), which is connected to the control unit 3 and the drive unit 4 respectively. The control signals include level signals and voltage regulation signals. The level signals are used to control the direction of the drive current, while the voltage regulation signals are used to regulate the supply voltage output from the power supply unit 5 to the drive unit 4, thereby controlling the magnitude of the drive current.

[0099] In practice, the control unit 3 sends a voltage adjustment signal to the power supply unit 5, and the power supply unit 5 adjusts the power supply voltage it outputs to the drive unit 4 according to the voltage adjustment signal. The drive unit 4 receives the level signal sent by the control unit 3, and at the same time receives the power supply voltage output by the power supply unit 5, and determines the second drive current it outputs to the magnetic force application element 12 according to the level signal and the power supply voltage.

[0100] In this embodiment, the magnetically controlled force application component 12 is described using a combination structure of electromagnets, elastomers, and permanent magnets stacked sequentially. When the driving unit 4 outputs a driving current in the first direction, the electromagnet and the permanent magnet generate a magnetic repulsive force, increasing the pressure applied by the magnetically controlled force application component 12. When the driving unit 4 outputs a driving current in the second direction, the electromagnet and the permanent magnet generate a magnetic attraction force, decreasing the pressure applied by the magnetically controlled force application component 12. The first and second directions are two opposite current directions.

[0101] Meanwhile, the higher the power supply voltage output by the power supply unit 5, the greater the driving current in the electromagnet coil, and the greater the deformation and corresponding pressure change of the magnetically controlled force application component 12; the lower the power supply voltage output by the power supply unit 5, the smaller the driving current in the electromagnet coil, and the smaller the deformation and corresponding pressure change of the magnetically controlled force application component 12.

[0102] Thus, by controlling the direction of the second driving current through a level signal and adjusting the power supply voltage output by the power supply unit 5 through a voltage adjustment signal, precise control of the direction and magnitude of the driving current can be achieved. Simultaneously, the power supply unit 5 can flexibly adjust the power supply voltage according to actual needs, making it suitable for the driving requirements of different magnetically controlled force-applying components 12.

[0103] In some embodiments, there are multiple cell packs 1 and control units 3 in the battery system; each control unit 3 is configured in a one-to-one correspondence with a cell pack 1; each control unit 3 is connected to the battery management system in the vehicle where the battery system is located.

[0104] The control unit 3 is also used to determine the current pressure value of the cell group 1 corresponding to the cell group 1 based on the pressure value of the gap between each cell in the cell group 1 corresponding to the control unit 3, and send the current pressure value to the battery management system, so that after receiving the current pressure value sent by each control unit 3, the battery management system generates and sends a voltage adjustment command to the control unit 3 based on the current pressure value.

[0105] The control unit 3 is also used to adjust the pressure value between each cell in response to a voltage regulation command.

[0106] In this embodiment, the battery system comprises multiple cell packs 1 and multiple control units 3. Each control unit 3 is configured in a one-to-one correspondence with a cell pack 1, meaning each cell pack 1 is equipped with one control unit 3 for independently monitoring and controlling the pressure between each cell within that cell pack 1. Each control unit 3 is also connected to the battery management system in the vehicle where the battery system is located to enable data reporting and command reception.

[0107] During the pressure monitoring process, each control unit 3 determines the current pressure value corresponding to the cell group 1 based on the pressure value of each cell gap in the cell group 1 corresponding to the control unit 3, and sends the current pressure value to the battery management system.

[0108] After receiving the current pressure values ​​reported by each control unit 3, the battery management system comprehensively evaluates the pressure distribution of each cell group 1 in the entire battery system, generates corresponding voltage adjustment commands based on the current pressure values, and sends these commands to each control unit 3. Upon receiving the voltage adjustment command, each control unit 3 adjusts the pressure value between each cell in response to the command.

[0109] In one embodiment, in response to the instruction, the drive unit 4 corresponding to the control unit 3 drives the magnetic force application member 12 corresponding to each cell gap to deform, so as to adjust the pressure value of each cell gap, so that the pressure of each cell group 1 tends to be balanced or maintained within its respective target range.

[0110] For example, after the battery management system receives the current pressure values ​​reported by each control unit 3, if it detects a large deviation in pressure values ​​between each cell group 1, it will send a voltage reduction adjustment command to the control unit 3 corresponding to the cell group 1 with higher pressure and a voltage increase adjustment command to the control unit 3 corresponding to the cell group 1 with lower pressure, so that the pressure of each cell group 1 tends to the same target range, thereby achieving balanced control of the overall pressure distribution of the battery system.

[0111] Thus, by setting up multiple control units 3 to manage multiple cell groups 1 respectively, and connecting each control unit 3 to the battery management system, a hierarchical architecture of cell group-level pressure monitoring and vehicle-level pressure regulation is achieved. Each control unit 3 is responsible for the pressure acquisition and execution of its own cell group, while the battery management system coordinates the pressure status of each cell group 1 to achieve balanced pressure distribution management.

[0112] This embodiment also provides a vehicle that includes any of the battery systems described above.

[0113] The vehicle can be an electric vehicle, and the battery system can be the power battery system in the vehicle.

[0114] This embodiment also provides a control method for a battery system, which can be applied to the control unit 3 in any of the battery systems described above. Please refer to... Figure 7 The control method provided in this embodiment may include the following steps:

[0115] Step S701: Obtain pressure detection data of the gap between cells in the cell group.

[0116] Specifically, the battery pack consists of multiple stacked cells, with gaps between adjacent cells. Pressure detection data from these gaps is acquired to sense the current pressure on the cells in real time.

[0117] Step S702: Determine the pressure value of the cell gap based on the pressure detection data.

[0118] Specifically, when pressure detection data of the cell gap is received, the pressure value of the current cell gap is calculated based on the pressure detection data.

[0119] Optionally, in one possible implementation, the pressure detection unit can be a fiber Bragg grating sensor embedded within the battery cell. The FBG sensor outputs a reflected light signal to the acquisition unit, which demodulates the reflected light signal to obtain the demodulated result of the Bragg wavelength. The demodulated result is then sent as pressure monitoring data to the control unit, which calculates the pressure value of the cell gap based on the demodulated result.

[0120] Step S703: Generate a control signal based on the pressure value, and adjust the pressure value of the cell gap based on the control signal.

[0121] In practice, the pressure value between the battery cells can be compared with a preset target pressure value. If the pressure value deviates from the target pressure value, the control unit generates a corresponding control signal based on the deviation and sends the control signal to the drive unit. The drive unit then outputs the required drive signal to the regulating component deployed corresponding to the battery cell gap, thereby driving the regulating component to adjust the pressure value between the battery cells. For example, the regulating component can be driven to change its stiffness or deformation to adjust the contact pressure between the battery cells, thus achieving regulation of the battery cell gap pressure value.

[0122] For example, in one embodiment, after receiving a control signal, the drive unit outputs the required drive signal to the magnetically controlled force-applying component deployed corresponding to the cell gap, thereby driving the magnetically controlled force-applying component to deform and thus changing the pressure applied by the magnetically controlled force-applying component to its associated cell assembly, thereby adjusting the pressure value of the cell gap. The drive unit and the magnetically controlled force-applying component are adapted to each other; that is, the specific architecture of the drive unit and its output signal match the specific implementation of the magnetically controlled force-applying component, ensuring that the drive unit can accurately drive the magnetically controlled force-applying component according to the received control signal.

[0123] Optionally, in one possible implementation, the control signal comprises two parts: a level signal and a pulse width modulation signal. These two parts work together on the drive unit to precisely control the drive current output by the drive unit. Upon receiving the control signal, the drive unit determines the direction of the drive current based on the level state of the level signal, and simultaneously determines the magnitude of the drive current based on the duty cycle of the pulse width modulation signal.

[0124] Taking a magnetically controlled force-applying component with a combination structure of electromagnets, elastic bodies, and permanent magnets stacked sequentially, and an H-bridge drive circuit as an example, the H-bridge drive circuit receives a level signal (which includes two logic control signals) and controls the conduction combination of its internal switching transistors according to the level signal, thereby changing the direction of the current flowing through the electromagnet coil. When the H-bridge drive circuit outputs a drive current in the first direction, the electromagnet and permanent magnet repel each other, increasing the width of the magnetically controlled force-applying component along the cell arrangement direction, thus increasing the pressure applied by the magnetically controlled force-applying component. When the H-bridge drive circuit outputs a drive current in the second direction, the electromagnet and permanent magnet attract each other, decreasing the width of the magnetically controlled force-applying component along the cell arrangement direction, thus decreasing the pressure applied by the magnetically controlled force-applying component. The first and second directions are two opposite current directions.

[0125] Meanwhile, the duty cycle of the pulse width modulation signal determines the effective or average value of the drive current, thereby controlling the deformation of the magnetically controlled force application component.

[0126] In this way, by using level signals and pulse width modulation signals to control the direction and magnitude of the driving current respectively, precise and rapid control of the deformation direction and deformation of the magnetically controlled force-applying component can be achieved.

[0127] It should be noted that the relevant structures and working principles involved in this embodiment can be referred to the description in the aforementioned battery system, and will not be repeated here.

[0128] The control method provided in this embodiment receives pressure detection data of the cell gap, calculates the pressure value of the cell gap based on the pressure detection data, and precisely and dynamically adjusts the pressure on the cell according to the control signal, thereby ensuring that the pressure value of the cell gap can be maintained within a reasonable range, and ensuring the performance stability and operational safety of the battery system.

[0129] In some embodiments, determining the pressure value of the cell gap based on pressure detection data includes:

[0130] The actual resistance change of the pressure detection unit is determined based on the pressure detection data, the first preset initial resistance value of each arm resistor in the Wheatstone bridge within the acquisition unit, and the second preset initial resistance value of the pressure detection unit within the cell gap; wherein, the pressure detection data is determined based on the resistance value of the pressure detection unit.

[0131] The pressure value corresponding to the actual resistance change is determined based on the actual resistance change and the preset relationship between the resistance change and the pressure value.

[0132] The pressure value corresponding to the actual resistance change is determined as the pressure value of the cell gap.

[0133] In the battery system, the acquisition unit is connected to the pressure detection unit in the cell gap in the cell group to acquire the pressure detection data of the cell gap, so as to sense the current pressure of the cell in real time and send the pressure detection data of the cell gap to the control unit.

[0134] Specifically, the pressure sensing unit (e.g., a thin-film pressure sensor) is connected as a resistive sensing element to one arm of a Wheatstone bridge. Its resistance changes with the contact pressure, and the remaining arms of the Wheatstone bridge are fixed resistors with known resistance values. When the resistance of the pressure sensing unit changes, the differential voltage output by the bridge also changes accordingly.

[0135] The control unit can calculate the actual resistance change of the pressure detection unit based on the differential voltage value, the first preset initial resistance value of each arm of the Wheatstone bridge, and the second preset initial resistance value of the pressure detection unit. Specifically, when the first preset initial resistance value of each arm of the Wheatstone bridge and the second preset initial resistance value of the pressure detection unit are both R, the actual resistance change can be calculated based on the above equation (1), which will not be elaborated further here.

[0136] It should be noted that in practical applications, the first preset initial resistance value of each arm of the Wheatstone bridge is usually different from the second preset initial resistance value of the pressure detection unit. In this case, it can be determined according to... The calculation formula ( The actual resistance change can be calculated by back-calculating the above equations (2) and (3), which will not be repeated here.

[0137] Furthermore, the control unit finds the pressure value corresponding to the actual resistance change based on the pre-stored correspondence between resistance change and pressure value, and determines the pressure value as the pressure value of the cell gap.

[0138] The method provided in this embodiment calculates the resistance change of the pressure detection unit by back-calculating based on the differential voltage value, the first preset initial resistance value of each arm resistor in the Wheatstone bridge, and the second preset initial resistance value of the pressure detection unit. In this way, the pressure value of the current cell gap can be accurately calculated based on the resistance change.

[0139] In some embodiments, generating a control signal based on a pressure value includes:

[0140] When the detected pressure value is greater than the maximum pressure value in the preset pressure range, a first control signal is generated based on the pressure value; the first control signal is used to control the magnetically controlled force application element deployed in the cell gap to deform in the direction away from the adjacent cell;

[0141] When the detected pressure value is less than the minimum pressure value in the preset pressure range, a second control signal is generated based on the pressure value; the second control signal is used to control the magnetic force application component to deform in the direction of the adjacent cell closer to the magnetic force application component.

[0142] For details, please refer to Figure 5 After determining the pressure value of the cell gap based on the pressure detection data, the control unit compares this pressure value with a preset pressure range to determine whether the current pressure is within the preset pressure range. This preset pressure range includes an upper limit (i.e., the maximum pressure value) and a lower limit (i.e., the minimum pressure value), and its specific values ​​can be determined according to the characteristics of the cell used.

[0143] For example, in one embodiment, the preset pressure range is 5~15 MPa. Within this range, the solid-solid interface of the battery cell can maintain a tight fit, and the ionic conductivity and cycle stability can be well guaranteed. It should be noted that this numerical range is only illustrative, and those skilled in the art can flexibly set the pressure range according to actual application requirements.

[0144] When the detected pressure value exceeds the maximum pressure value in the preset pressure range, it indicates that the pressure at the cell gap is too high. At this time, the control unit generates a first control signal, which instructs the drive unit to drive the magnetically controlled force-applying component to deform in the direction away from the magnetically controlled force-applying component and adjacent cells (i.e., the width of the magnetically controlled force-applying component along the cell arrangement direction decreases), thereby reducing the pressure applied to the cell assembly.

[0145] When the detected pressure value is less than the minimum pressure value in the preset pressure range, it indicates that the pressure at the cell gap is insufficient. At this time, the control unit generates a second control signal, which instructs the drive unit to drive the magnetically controlled force-applying component to deform in the direction of the adjacent cell closer to the magnetically controlled force-applying component (i.e., the width of the magnetically controlled force-applying component along the cell arrangement direction increases), thereby increasing the pressure applied to the cell assembly.

[0146] In addition, if it is detected that the current pressure is within the preset pressure range, the magnetically controlled force application component will not be driven, and the pressure value will continue to be monitored.

[0147] The method provided in this embodiment compares the real-time detected pressure value with a preset pressure range and generates a corresponding control signal based on the comparison result to drive the magnetically controlled force-applying component to deform in the direction away from or close to the adjacent battery cell, thereby achieving dynamic adjustment of the pressure between the battery cells and ensuring that the pressure in the battery cell gap is always maintained within the preset safe pressure range.

[0148] In some embodiments, the control signal includes a level signal and a voltage regulation signal; the control method further includes:

[0149] A voltage regulation signal is generated based on the pressure value, and the power supply voltage of the drive unit is controlled based on the voltage regulation signal, so that the drive unit outputs a drive current to the magnetically controlled force-applying component according to the level signal and the power supply voltage, thereby driving the magnetically controlled force-applying component to deform; wherein, the current direction of the drive current is determined according to the level state of the level signal, and the current magnitude of the drive current is determined according to the power supply voltage.

[0150] In practice, the control unit sends a voltage adjustment signal to the power supply unit of the drive unit, and the power supply unit adjusts its output voltage to the drive unit according to the voltage adjustment signal. The drive unit receives the level signal sent by the control unit and the power supply voltage output by the power supply unit, and determines the drive current it outputs to the magnetic force application component based on the level signal and the power supply voltage.

[0151] In this embodiment, the magnetically controlled force application component is described using a combination structure of electromagnets, elastomers, and permanent magnets stacked sequentially. When the driving unit outputs a driving current in the first direction, the electromagnet and the permanent magnet generate magnetic repulsion, increasing the pressure applied by the magnetically controlled force application component. When the driving unit outputs a driving current in the second direction, the electromagnet and the permanent magnet generate magnetic attraction, decreasing the pressure applied by the magnetically controlled force application component. The first and second directions are two opposite current directions.

[0152] Meanwhile, the higher the power supply voltage output by the power supply unit, the greater the driving current in the electromagnet coil, and the greater the deformation and corresponding pressure change of the magnetically controlled force-applying component; the lower the power supply voltage output by the power supply unit, the smaller the driving current in the electromagnet coil, and the smaller the deformation and corresponding pressure change of the magnetically controlled force-applying component.

[0153] The method provided in this embodiment controls the direction of the drive current through a level signal and adjusts the power supply voltage output by the power supply unit through a voltage regulation signal, thereby achieving precise control over the direction and magnitude of the drive current. Simultaneously, the power supply unit can flexibly adjust the power supply voltage according to actual needs, making it suitable for the drive requirements of different magnetically controlled force-applying components.

[0154] In some embodiments, the control method further includes:

[0155] Based on the pressure value between each cell in the cell group, the current pressure value of the cell group is determined and sent to the battery management system in the vehicle where the battery system is located. After receiving the current pressure value of each cell group, the battery management system generates and returns a voltage adjustment command based on the current pressure value.

[0156] In response to voltage regulation commands, the pressure value between each cell is adjusted.

[0157] In this embodiment, the battery system comprises multiple cell packs and control units. Each control unit is configured in a one-to-one correspondence with a cell pack; that is, each cell pack is equipped with one control unit for independently monitoring and controlling the pressure between each cell within that cell pack. Each control unit is also connected to the battery management system in the vehicle where the battery system is located to enable data reporting and command reception.

[0158] During the pressure monitoring process, each control unit determines the current pressure value of the cell group based on the pressure value of the gap between each cell in the cell group corresponding to the control unit, and sends the current pressure value to the battery management system.

[0159] After receiving the current pressure values ​​reported by each control unit, the battery management system comprehensively evaluates the pressure distribution of each cell group in the entire battery system, generates corresponding voltage adjustment commands based on the current pressure values, and sends these commands to each control unit. Upon receiving the voltage adjustment command, each control unit adjusts the pressure value between each cell in response to the command.

[0160] In one embodiment, in response to the instruction, the drive unit corresponding to the control unit is controlled to drive the magnetic force application element corresponding to each cell gap to deform, so as to adjust the pressure value of each cell gap, so that the pressure of each cell group tends to be balanced or maintained within its respective target range.

[0161] For example, after receiving the current pressure values ​​reported by each control unit, if the battery management system detects a large deviation in pressure values ​​between each cell group, it will send a voltage reduction adjustment command to the control unit corresponding to the cell group with higher pressure and a voltage increase adjustment command to the control unit corresponding to the cell group with lower pressure, so that the pressure of each cell group tends to the same target range, thereby achieving balanced control of the overall pressure distribution of the battery system.

[0162] The method provided in this embodiment achieves a hierarchical architecture of cell-level pressure monitoring and vehicle-level pressure regulation by setting up multiple control units to manage multiple cell groups and connecting all control units to a unified battery management system. Each control unit is responsible for the pressure acquisition and execution of its own cell group, while the battery management system coordinates the pressure status of each cell group to achieve balanced pressure distribution management.

[0163] This embodiment also provides a control device for a battery system, which is used to implement the above-described method embodiments and preferred embodiments; details already described will not be repeated. The terms "module," "unit," "subunit," etc., used below can refer to a combination of software and / or hardware that performs a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0164] Figure 8 This is a structural block diagram of the control device of the battery system in this embodiment, as shown below. Figure 8 As shown, the control device includes:

[0165] The receiving module 100 is used to acquire pressure detection data of the gaps between the battery cells in the battery cell group;

[0166] The calculation module 200 is used to determine the pressure value of the cell gap based on the pressure detection data;

[0167] The control module 300 is used to generate a control signal based on the pressure value and adjust the pressure value of the cell gap based on the control signal.

[0168] Optionally, in one possible implementation, the computation module 200 is specifically used for:

[0169] The actual resistance change of the pressure detection unit is determined based on the pressure detection data, the first preset initial resistance value of each arm resistor in the Wheatstone bridge within the acquisition unit, and the second preset initial resistance value of the pressure detection unit within the cell gap; wherein, the pressure detection data is determined based on the resistance value of the pressure detection unit.

[0170] The pressure value corresponding to the actual resistance change is determined based on the actual resistance change and the preset relationship between the resistance change and the pressure value.

[0171] The pressure value corresponding to the actual resistance change is determined as the pressure value of the cell gap.

[0172] Optionally, in one possible implementation, the control module 300 is specifically used for:

[0173] When the detected pressure value is greater than the maximum pressure value in the preset pressure range, a first control signal is generated based on the pressure value; the first control signal is used to control the magnetic force application component to deform in the direction away from the magnetic force application component and the adjacent cell.

[0174] When the detected pressure value is less than the minimum pressure value in the preset pressure range, a second control signal is generated based on the pressure value; the second control signal is used to control the magnetic force application component to deform in the direction of the adjacent cell closer to the magnetic force application component.

[0175] Optionally, in one possible implementation, the control module 300 is specifically used for:

[0176] A voltage regulation signal is generated based on the pressure value, and the power supply voltage of the drive unit is controlled based on the voltage regulation signal, so that the drive unit outputs a drive current to the magnetically controlled force-applying component according to the level signal and the power supply voltage, thereby driving the magnetically controlled force-applying component to deform; wherein, the current direction of the drive current is determined according to the level state of the level signal, and the current magnitude of the drive current is determined according to the power supply voltage.

[0177] Optionally, in one possible implementation, in Figure 8 In addition to the above, the device also includes an adjustment module for:

[0178] Based on the pressure value between each cell in the cell group, the current pressure value of the cell group is determined and sent to the battery management system in the vehicle where the battery system is located. After receiving the current pressure value of each cell group, the battery management system generates and returns a voltage adjustment command based on the current pressure value.

[0179] In response to voltage regulation commands, the pressure value between each cell is adjusted.

[0180] It should be noted that the above modules can be functional modules or program modules, and can be implemented through software or hardware. For modules implemented through hardware, the above modules can reside in the same processor; or the above modules can be located in different processors in any combination.

[0181] This embodiment also provides a computer device, including a memory and a processor. The memory stores a computer program, and the processor is configured to run the computer program to perform the steps in any of the above method embodiments. The computer device may be the control unit described above.

[0182] It should be noted that the specific examples in this embodiment can refer to the examples described in the above embodiments and optional implementations, and will not be repeated in this embodiment.

[0183] Furthermore, in conjunction with the battery system control methods provided in the above embodiments, this embodiment can also provide a storage medium for implementation. This storage medium stores a computer program; when executed by a processor, the computer program implements any of the battery system control methods described in the above embodiments.

[0184] It should be understood that the specific embodiments described herein are merely illustrative of the application and not intended to limit it. All other embodiments derived by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection of this application.

[0185] Obviously, the accompanying drawings are merely some examples or embodiments of this application. Those skilled in the art can apply this application to other similar situations based on these drawings without any creative effort. Furthermore, it is understood that although the work done in this development process may be complex and lengthy, for those skilled in the art, certain design, manufacturing, or production modifications made based on the technical content disclosed in this application are merely conventional technical means and should not be considered as insufficient disclosure of this application.

[0186] The term "embodiment" in this application refers to a specific feature, structure, or characteristic described in connection with an embodiment that may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily imply the same embodiment, nor does it imply that it is mutually exclusive with or independent of other embodiments. It will be clearly or implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0187] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of patent protection. 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 all fall within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the appended claims.

Claims

1. A battery system, characterized in that, The battery system includes a cell pack, a data acquisition unit, a control unit, and a drive unit; both the data acquisition unit and the drive unit are connected to the cell pack. The acquisition unit is used to acquire pressure detection data of the gap between the cells in the cell group and send the pressure detection data to the control unit. The control unit is used to determine the pressure value of the cell gap based on the received pressure detection data, and generate a control signal based on the pressure value, and send the control signal to the drive unit. The drive unit is used to adjust the pressure value of the cell gap in response to the control signal.

2. The battery system according to claim 1, characterized in that, The acquisition unit includes a Wheatstone bridge and an acquisition circuit; wherein... The Wheatstone bridge is used to collect the resistance value of the pressure detection unit within the gap between the battery cells; The Wheatstone bridge is also used to convert the resistance value into a differential voltage signal and output the differential voltage signal to the acquisition circuit. The acquisition circuit is used to determine the differential voltage value based on the differential voltage signal, and to determine the pressure detection data based on the differential voltage value.

3. The battery system according to claim 2, characterized in that, Determining the pressure value of the cell gap based on the received pressure detection data includes: The actual resistance change of the pressure detection unit is determined based on the differential voltage value, the first preset initial resistance value of each arm resistor in the Wheatstone bridge, and the second preset initial resistance value of the pressure detection unit. Based on the actual resistance change and the preset relationship between the resistance change and the pressure value, the pressure value corresponding to the actual resistance change is determined. The pressure value corresponding to the actual resistance change is determined as the pressure value of the cell gap.

4. The battery system according to claim 1, characterized in that, The step of adjusting the pressure value of the cell gap in response to the control signal includes: In response to the control signal, the magnetically controlled force application element deployed corresponding to the cell gap is driven to deform, so as to adjust the pressure value of the cell gap.

5. The battery system according to claim 4, characterized in that, The step of generating a control signal based on the pressure value includes: When the pressure value is detected to be greater than the maximum pressure value in the preset pressure range, a first control signal is generated based on the pressure value; the first control signal is used to instruct the drive unit to drive the magnetically controlled force application component to deform in the direction away from the magnetically controlled force application component and the adjacent cell. When the pressure value is detected to be less than the minimum pressure value in the preset pressure range, a second control signal is generated based on the pressure value; the second control signal is used to instruct the drive unit to drive the magnetically controlled force application element to deform in the direction of the adjacent cell closer to the magnetically controlled force application element.

6. The battery system according to claim 5, characterized in that, The drive unit is further configured to determine the drive current output by the drive unit to the magnetically controlled force application component based on the control signal; The driving unit is further configured to output the driving current to the magnetically controlled force-applying component to drive the magnetically controlled force-applying component to deform; wherein, the current direction of the driving current is used to control the magnetically controlled force-applying component to deform towards the adjacent cell close to the magnetically controlled force-applying component or away from the adjacent cell close to the magnetically controlled force-applying component, and the current magnitude of the driving current is used to control the deformation of the magnetically controlled force-applying component.

7. The battery system according to claim 6, characterized in that, The control signals include level signals and pulse width modulation signals; The driving unit is further configured to determine a first driving current output by the driving unit to the magnetically controlled force application component according to the control signal; wherein the current direction of the first driving current is determined according to the level state of the level signal, and the current magnitude of the first driving current is determined according to the duty cycle of the pulse width modulation signal.

8. The battery system according to claim 6, characterized in that, The battery system further includes a power supply unit; the power supply unit is connected to the control unit and the drive unit respectively; the control signal includes a level signal and a voltage regulation signal; The control unit is further configured to send the voltage regulation signal to the power supply unit, so that the power supply unit adjusts the power supply voltage output by the power supply unit to the drive unit; The driving unit is further configured to determine a second driving current output by the driving unit to the magnetically controlled force application component based on the level signal and the power supply voltage; wherein the current direction of the second driving current is determined based on the level state of the level signal, and the current magnitude of the second driving current is determined based on the power supply voltage.

9. The battery system according to claim 1, characterized in that, The battery system contains multiple cell packs and multiple control units; each control unit is configured in a one-to-one correspondence with a cell pack; each control unit is connected to the battery management system in the vehicle where the battery system is located. The control unit is further configured to determine the current pressure value corresponding to the cell group based on the pressure value of the gap between each cell in the cell group corresponding to the control unit, and send the current pressure value to the battery management system, so that after receiving the current pressure value sent by each of the control units, the battery management system generates and sends a voltage adjustment command to the control unit based on each of the current pressure values; The control unit is also configured to adjust the pressure value of each of the cell gaps in response to the voltage adjustment command.

10. A vehicle, characterized in that, The vehicle includes the battery system as claimed in any one of claims 1 to 9.

11. A control method for a battery system, characterized in that, The control method is applied to the control unit; the control method includes: Acquire pressure detection data of the gaps between cells in the cell assembly; Based on the pressure detection data, the pressure value of the cell gap is determined; A control signal is generated based on the pressure value, and the pressure value of the cell gap is adjusted based on the control signal.

12. The control method according to claim 11, characterized in that, The acquisition of pressure detection data between battery cells in the battery cell assembly includes: Receive the pressure detection data sent by the acquisition unit; Determining the pressure value of the cell gap based on the pressure detection data includes: The actual resistance change of the pressure detection unit is determined based on the pressure detection data, the first preset initial resistance value of each arm resistor in the Wheatstone bridge within the acquisition unit, and the second preset initial resistance value of the pressure detection unit within the cell gap; wherein the pressure detection data is determined based on the resistance value of the pressure detection unit. Based on the actual resistance change and the preset relationship between the resistance change and the pressure value, the pressure value corresponding to the actual resistance change is determined. The pressure value corresponding to the actual resistance change is determined as the pressure value of the cell gap.

13. The control method according to claim 11, characterized in that, The step of generating a control signal based on the pressure value includes: When the pressure value is detected to be greater than the maximum pressure value in the preset pressure range, a first control signal is generated based on the pressure value; the first control signal is used to control the magnetically controlled force application element deployed corresponding to the cell gap to deform in the direction away from the magnetically controlled force application element and the adjacent cell. When the pressure value is detected to be less than the minimum pressure value in the preset pressure range, a second control signal is generated based on the pressure value; the second control signal is used to control the magnetically controlled force application component to deform in the direction of the adjacent cell closer to the magnetically controlled force application component.

14. The control method according to claim 13, characterized in that, The control signal includes a level signal and a voltage adjustment signal; the method further includes: A voltage adjustment signal is generated based on the pressure value, and the power supply voltage of the drive unit is controlled based on the voltage adjustment signal, so that the drive unit outputs a drive current to the magnetically controlled force-applying component according to the level signal and the power supply voltage, so as to drive the magnetically controlled force-applying component to deform; wherein, the current direction of the drive current is determined according to the level state of the level signal, and the current magnitude of the drive current is determined according to the power supply voltage.

15. The control method according to claim 11, characterized in that, The method further includes: Based on the pressure value between each cell in the cell group, the current pressure value corresponding to the cell group is determined, and the current pressure value is sent to the battery management system in the vehicle where the battery system is located, so that after receiving the current pressure value corresponding to each cell group, the battery management system generates and returns a voltage adjustment command based on each current pressure value. In response to the voltage regulation command, the pressure value of each of the cell gaps is adjusted.

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