A battery pack, a control method of the battery pack, and a vehicle

Abstract

The embodiment of the application provides a battery pack, a control method of the battery pack and a vehicle, and the battery pack comprises: a shell, the shell has a containing cavity; a first movable beam, the first movable beam is arranged in the containing cavity, the first movable beam is movably connected with the shell, and the first movable beam divides the containing cavity into a first cavity and a second cavity; a battery cell, the battery cell is arranged in the first cavity, and the battery cell abuts against the first movable beam; and a driving piece, the driving piece is arranged in the second cavity, a driving end of the driving piece is connected with the first movable beam, and the driving piece is used for driving the first movable beam to move relative to the shell, so as to adjust the volume of the first cavity. The application solves the technical problems that the battery pack cannot autonomously regulate and control the expansion pressure of the battery cell and the space utilization is low in the prior art.

Description

Technical Field

[0001] This application relates to the technical field of battery packs, and more specifically, to a battery pack, a battery pack control method, and a vehicle. Background Technology

[0002] During long-term charge-discharge cycles, the chemical reactions inside the battery cell cause it to expand in volume. This expansion not only affects the physical structural stability of the battery, but also accelerates battery aging and shortens its lifespan.

[0003] To extend battery cycle life, the cells need to operate within a certain pressure range to prevent a sudden drop in lifespan later on. Current technologies commonly use methods such as leaving gaps between cells or adding elastic buffer materials to reduce or release cell expansion pressure. However, these methods have limitations; for example, they cannot autonomously control the pressure, and they occupy cell installation space, reducing the space utilization rate of the battery system.

[0004] There is currently no good solution to the technical problems of existing battery packs being unable to autonomously regulate cell expansion pressure and having low space utilization. Summary of the Invention

[0005] This application provides a battery pack, a battery pack control method, and a vehicle to at least solve the technical problems in the prior art where the battery pack cannot autonomously regulate the cell expansion pressure and has low space utilization.

[0006] According to one aspect of the embodiments of this application, a battery pack is provided, comprising: a housing having a receiving cavity; a first movable beam disposed within the receiving cavity and movably connected to the housing, the first movable beam dividing the receiving cavity into a first chamber and a second chamber; a battery cell disposed within the first chamber and abutting against the first movable beam; and a driving member disposed within the second chamber, the driving end of the driving member being connected to the first movable beam, the driving member being used to drive the first movable beam to move relative to the housing to adjust the volume of the first chamber.

[0007] Furthermore, the battery pack also includes: a pressure sensor, which is located between the battery cell and the first movable beam, and is used to detect the battery cell pressure; and a battery management system, which is located in the second chamber and is electrically connected to the drive unit and the pressure sensor, respectively, and controls the drive unit to operate according to the battery cell pressure.

[0008] Furthermore, a second movable beam is provided in the first chamber, which is movably connected to the shell. The second movable beam divides the first chamber into multiple chambers, and the battery cell abuts against the second movable beam.

[0009] Furthermore, a guide rail is provided on the inner side of the housing frame, and the first movable beam is slidably connected to the guide rail via a slider.

[0010] Furthermore, the slider is provided with a locking element, which has a locking position that engages with the housing and an unlocking position that is movable relative to the housing.

[0011] According to another aspect of the embodiments of this application, a control method for a battery pack is also provided. The battery pack is the aforementioned battery pack. The control method includes: acquiring the cell pressure of the battery pack; comparing the cell pressure with a preset pressure to obtain a comparison result; generating a control strategy set based on the comparison result, wherein the control strategy set includes at least one of the following: adjusting the position of the first movable beam to change the volume of the first chamber, or keeping the position of the first movable beam unchanged.

[0012] Furthermore, a control strategy set is generated based on the comparison results, including: when the cell pressure is greater than a first preset pressure and less than a second preset pressure, a first target strategy is generated in the control strategy set, wherein the first target strategy is used to control the first movable beam to move along a first direction to increase the volume of the first chamber.

[0013] Furthermore, a control strategy set is generated based on the comparison results, including: when the cell pressure is less than or equal to the first preset pressure, a second target strategy is generated in the control strategy set, wherein the second target strategy is used to control the position of the first movable beam to remain unchanged.

[0014] Furthermore, when the cell pressure is greater than or equal to a second preset pressure, a warning message is generated, which is used to indicate that there is a risk of cell failure.

[0015] According to another aspect of the embodiments of this application, a vehicle is also provided, the vehicle including the battery pack described above.

[0016] In this embodiment, a first movable beam divides the housing cavity into a first chamber and a second chamber. The battery cell is housed in the first chamber, abutting against the first movable beam. The first movable beam serves as a support frame for the battery cell without occupying its installation space, thus improving the space utilization of the battery pack. A drive unit is located in the second chamber, driving the first movable beam to adjust the volume of the first chamber. This means the drive unit can autonomously adjust the volume of the first chamber according to the battery cell's expansion, achieving dynamic adjustment of the battery cell pressure. The aforementioned battery pack, through the cooperation of the first movable beam and the drive unit, adjusts the battery cell installation space to release the expansion pressure of the battery cell, solving the technical problems of existing battery packs that cannot autonomously control the expansion pressure of the battery cells and have low space utilization. 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 A schematic diagram of the battery pack structure in this application is shown;

[0019] Figure 2 A partial structural schematic diagram of the battery pack in this application is shown.

[0020] The above figures include the following reference numerals:

[0021] 1. Shell;

[0022] 11. First chamber; 12. Second chamber;

[0023] 2. First movable beam;

[0024] 3. Driving components;

[0025] 4. Battery cells;

[0026] 5. Pressure sensor;

[0027] 6. Battery Management System;

[0028] 7. Second movable beam. Detailed Implementation

[0029] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0030] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0031] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of this application is thorough and complete, and that the concept of these exemplary embodiments is fully conveyed to those skilled in the art. In the drawings, for clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to denote the same devices, and therefore their description will be omitted.

[0032] In existing technical solutions, space is usually reserved between battery cells, or elastic components are set on both sides of the battery cell module to suppress the cyclic expansion of the battery cells. This arrangement will waste space within the battery system and reduce the volume packing ratio of the battery system. Since the size of the battery module or system is fixed, as the battery cells cyclically expand, the pressure on the elastic components will increase, which will cause the elastic components to have a decreasing effect on suppressing the cyclic expansion of the battery cells.

[0033] Combination Figures 1 to 2 As shown, a battery pack is provided according to a specific embodiment of this application.

[0034] Specifically, the battery pack includes: a housing 1, battery cells 4, a first movable beam 2, and a driving member 3. The housing 1 has a receiving cavity, and the first movable beam 2 is disposed within the receiving cavity. The first movable beam 2 is movably connected to the housing 1, and the first movable beam 2 divides the receiving cavity into a first chamber 11 and a second chamber 12. The battery cells 4 are disposed within the first chamber 11, and the battery cells 4 abut against the first movable beam 2. The driving member 3 is disposed within the second chamber 12, and the driving end of the driving member 3 is connected to the first movable beam 2. The driving member 3 is used to drive the first movable beam 2 to move relative to the housing 1, thereby adjusting the volume of the first chamber 11.

[0035] In this embodiment, the first movable beam 2 divides the housing 1's accommodating cavity into a first chamber 11 and a second chamber 12. The battery cell 4 is disposed in the first chamber 11, and the battery cell 4 abuts against the first movable beam 2. That is, the first movable beam 2 serves as a support frame for the battery cell 4 and does not occupy the installation space of the battery cell 4, thus improving the space utilization rate of the battery pack. The driving component 3 is disposed in the second chamber 12. The driving component 3 drives the first movable beam 2 to move to adjust the volume of the first chamber 11. That is, the driving component 3 can autonomously adjust the volume of the first chamber 11 according to the expansion of the battery cell 4, thereby achieving dynamic adjustment of the battery cell pressure. The above-mentioned battery pack, through the cooperation of the first movable beam 2 and the driving component 3, realizes the adjustment of the battery cell 4's installation space to release the expansion pressure of the battery cell 4, solving the technical problems of existing battery packs being unable to autonomously control the expansion pressure of the battery cell 4 and having low space utilization.

[0036] like Figure 1As shown, the housing 1 has a receiving cavity, and a first movable beam 2 is disposed within the receiving cavity. The bottom of the first movable beam 2 abuts against the inner bottom wall of the housing 1, the top wall of the first movable beam 2 abuts against the inner top of the housing 1, and the side wall of the first movable beam 2 abuts against the inner frame of the housing 1, thereby dividing the receiving cavity into a first chamber 11 and a second chamber 12. The first chamber 11 and the second chamber 12 are not interconnected. The battery cell 4 is disposed within the first chamber 11 and abuts against the first movable beam 2. There are two driving members 3, which are disposed within the second chamber 12 and spaced apart along the width direction of the housing 1. The driving end of the driving member 3 is connected to the first movable beam 2. The driving member 3 can drive the first movable beam 2 away from the battery cell 4 to increase the volume of the first chamber 11, thereby releasing the expansion pressure of the battery cell 4. The driving member 3 can also drive the first movable beam 2 closer to the battery cell 4 to decrease the volume of the first chamber 11, thereby preventing the battery cell 4 from shaking.

[0037] Among them, the driving component 3 is a pressure regulator, which can be a mechanical regulator or an electronic proportional regulator, etc.

[0038] Furthermore, the battery pack also includes a pressure sensor 5 and a battery management system 6. The pressure sensor 5 is located between the battery cell 4 and the first movable beam 2, and is used to detect the cell pressure. The battery management system 6 is located in the second chamber 12, and is electrically connected to both the drive unit 3 and the pressure sensor 5. The battery management system 6 controls the operation of the drive unit 3 based on the cell pressure.

[0039] It should be noted that the cell pressure value refers to the cell's expansion pressure.

[0040] In the embodiments of this application, the pressure sensor 5 is located between the battery cell 4 and the first movable beam 2, and can monitor the expansion pressure of the battery cell 4 in real time during the charging and discharging process. The battery management system 6 controls the drive component 3 to perform actions based on the received battery cell pressure, so as to dynamically adjust the position of the first movable beam 2, thereby achieving precise adjustment of the volume of the first chamber 11.

[0041] like Figure 2 As shown, the pressure sensor 5 uses a flexible base material (such as polyimide, silicone rubber, etc.), with a thickness of 0.2~2mm and a range of 0~30000N. One side of the pressure sensor 5 is tightly fitted to the battery cell 4, and the other side is tightly fitted to the first movable beam 2 to monitor the expansion pressure of the battery cell 4 during charging and discharging in real time. The pressure sensor 5 is electrically connected to the battery management system 6 via wires. The battery management system 6 can receive the battery cell pressure feedback from the pressure sensor 5, which is the expansion pressure of the battery cell 4. The drive unit 3 is electrically connected to the battery management system 6 via wires, and the battery management system 6 adjusts the stroke of the drive unit 3 according to the battery cell pressure.

[0042] Preferably, the pressure sensor 5 covers the inner surface of the first movable beam 2. This arrangement ensures that the pressure sensor 5 provides comprehensive and continuous monitoring of the cell pressure, thereby providing more complete and accurate pressure data.

[0043] Furthermore, a second movable beam 7 is provided inside the first chamber 11. The second movable beam 7 is movably connected to the shell 1. The second movable beam 7 divides the first chamber 11 into multiple chambers, and the battery cell 4 abuts against the second movable beam 7.

[0044] In the embodiments of this application, the second movable beam 7 divides the first chamber 11 into multiple small chambers. Each independent small chamber can disperse the expansion of the cell 4 and isolate the thermal runaway of the cell 4. That is, through the isolation effect of the second movable beam 7, the impact on the cell 4 in other small chambers is reduced, thereby preventing chain reactions and improving the safety performance of the battery pack under extreme conditions.

[0045] like Figure 1 As shown, the second movable beam 7 is disposed within the first chamber 11 and is movably connected to the shell 1, meaning the second movable beam 7 can move along the length of the shell 1. The second movable beam 7 divides the first chamber 11 into two chambers, which are distributed along the length of the shell 1. The second movable beam 7 is slidably connected to the frame of the shell 1.

[0046] As an alternative embodiment, there are multiple second movable beams 7, which are spaced apart along the length of the housing 1.

[0047] Furthermore, a guide rail is provided on the inner side of the frame of the housing 1, and the first movable beam 2 is slidably connected to the guide rail via a slider.

[0048] In the embodiments of this application, the first movable beam 2 is slidably connected to the guide rail on the frame of the housing 1 via a slider, so that the first movable beam 2 can move smoothly and avoid jamming of the first movable beam 2, thereby achieving stable control of the expansion pressure of the battery cell 4.

[0049] For example, the guide rail is a groove formed on the inner side of the frame of the housing 1, and the slider is formed on both sides of the first movable beam 2, with part of the slider extending into the groove and slidingly connected to the groove.

[0050] For example, the guide rail is a linear guide rail connected to the inner side of the frame of the housing 1, and the slider is a rectangular slider that matches the linear guide rail.

[0051] Furthermore, the slider is provided with a locking member, which has a locking position that engages with the housing 1 for locking, and an unlocking position that can move relative to the housing 1.

[0052] In the embodiments of this application, when the locking member is in the locked position, it can effectively fix the slider and prevent the first movable beam 2 from moving unexpectedly due to the expansion force of the battery cell 4 or external vibration. When the locking member is in the unlocked position, the battery management system 6 can control the drive member 3 to drive the first movable beam 2 to a preset position according to the battery cell pressure to release the expansion pressure of the battery cell 4. The locking member is set so that the first movable beam 2 moves or locks according to the preset adjustment mechanism, thereby keeping the battery cell 4 within the optimal pressure range and ensuring the safety of the battery pack.

[0053] For example, the locking element is a first electromagnet connected to the slider, and a second electromagnet is provided on the guide rail that cooperates with the slider. By controlling the magnetic forces of the first and second electromagnets, the first movable beam 2 can be locked and unlocked. Specifically, the electromagnetic controller is electrically connected to the battery management system 6. The battery management system 6 controls the operation of the electromagnetic controller according to the cell pressure, thereby adjusting the magnetic forces of the first and second electromagnets.

[0054] Furthermore, the inner wall of the housing 1 is coated with thermally conductive adhesive, and the battery cell 4 abuts against the inner wall of the housing 1 through the thermally conductive adhesive. That is, the heat of the battery cell 4 can be quickly conducted to the housing 1 through the thermally conductive adhesive, thereby achieving heat dissipation of the battery cell 4 and releasing some of the expansion pressure of the battery cell 4 to a certain extent.

[0055] Furthermore, expansion foam can be arranged between the battery cells 4 to release some of the expansion pressure of the battery cells 4. The thickness of the expansion foam can be appropriately reduced to improve the utilization rate of the battery pack and increase the energy density of the battery pack.

[0056] Furthermore, expansion foam can be arranged between the battery cell 4 and the first movable beam 2 to release part of the expansion pressure of the battery cell 4. The thickness of the expansion foam can be appropriately reduced to improve the utilization rate of the battery pack and increase the energy density of the battery pack.

[0057] Furthermore, expansion foam can be arranged between the battery cell 4 and the second movable beam 7 to release part of the expansion pressure of the battery cell 4. The thickness of the expansion foam can be appropriately reduced to improve the utilization rate of the battery pack and increase the energy density of the battery pack.

[0058] According to another specific embodiment of this application, a control method for a battery pack is provided, wherein the battery pack is the aforementioned battery pack, and the control method includes the following steps:

[0059] Step S1: Obtain the cell pressure of the battery pack.

[0060] Specifically, the pressure sensor 5 in the above embodiment is used to sense the cell pressure (expansion pressure of cell 4) in real time. The pressure sensor 5 transmits the cell pressure data to the battery management system 6, which processes and analyzes the data.

[0061] Step S2: Compare the cell pressure with the preset pressure to obtain the comparison result.

[0062] Specifically, the battery management system 6 compares the acquired cell pressure with a preset pressure set by the system to determine whether the voltage and pressure are within the optimal pressure range. The preset pressure can be either a pressure range or a pressure value.

[0063] Step S3: Generate a control strategy set based on the comparison results, wherein the control strategy set includes at least one of the following: adjusting the position of the first movable beam 2 to change the volume of the first chamber 11, or keeping the position of the first movable beam 2 unchanged.

[0064] In the embodiments of this application, by real-time monitoring of cell pressure and combining it with a preset pressure threshold, a set of control strategies is dynamically generated to adjust or maintain the position of the first movable beam 2, thereby changing or maintaining the volume of the first chamber 11, and thus realizing the autonomous adjustment of the expansion pressure of the cell 4.

[0065] Furthermore, a control strategy set is generated based on the comparison results, including: when the cell pressure is greater than a first preset pressure and less than a second preset pressure, a first target strategy is generated in the control strategy set, wherein the first target strategy is used to control the first movable beam 2 to move along a first direction to increase the volume of the first chamber 11.

[0066] In the embodiments of this application, two preset pressure values ​​are set to accurately control the cell pressure, thereby identifying whether the expansion of cell 4 is within a controllable range and taking corresponding measures in a timely manner to reduce the risk of thermal runaway.

[0067] Specifically, it is determined whether the cell pressure is greater than the first preset pressure. If so, it means that the cell pressure is not within the optimal pressure range. It is then determined whether the cell pressure is greater than the first preset pressure. If not, it means that the cell pressure is within the controllable range. The battery management system 6 calculates the driving stroke of the drive component 3 based on the current cell pressure and controls the drive component 3 to drive the first movable beam 2 away from the cell 4, thereby increasing the volume of the first chamber 11 and releasing the expansion pressure of the cell 4.

[0068] Preferably, the intelligent pressure control system of the battery pack can be linked with the vehicle's driving mode. For example, in high-speed driving (high load) mode, the cell 4 may generate higher heat and expansion pressure. The intelligent pressure control system can reduce the threshold of the first preset pressure. In slow or low load mode, the threshold of the first preset pressure can be appropriately increased to optimize the usage efficiency of the battery pack.

[0069] Furthermore, a control strategy set is generated based on the comparison results, including: when the cell pressure is less than or equal to the first preset pressure, a second target strategy is generated in the control strategy set, wherein the second target strategy is used to control the position of the first movable beam 2 to remain unchanged.

[0070] In the embodiments of this application, when the cell pressure is less than or equal to the first preset pressure, it indicates that the cell 4 is within the optimal pressure range and there is no need to adjust the cell pressure, that is, the driving component 3 does not need to drive the first movable beam 2 to move.

[0071] Preferably, the intelligent pressure control system of the battery pack can be linked to the ambient temperature for control. For example, it can automatically adjust the first preset pressure according to changes in the external environment (such as temperature rise) to compensate for the thermal expansion and contraction characteristics of the battery cell 4. In high-temperature environments, even if the cell pressure has not yet reached the first preset pressure, the system may enter the pressure regulation mode in advance to avoid the risk of overpressure.

[0072] Furthermore, when the cell pressure is greater than or equal to the second preset pressure, a warning message is generated, which is used to indicate that cell 4 has a risk of failure.

[0073] In the embodiments of this application, when the cell pressure is greater than or equal to the second preset pressure, it indicates that an abnormality has occurred inside the cell 4, such as electrolyte leakage, internal short circuit, or other serious problems, and timely troubleshooting and handling are required.

[0074] Preferably, the second preset pressure can be subdivided into multiple pressure values ​​to correspond to different warning levels. For example, when the cell pressure is greater than or equal to the first warning pressure and less than the second warning pressure, a first-level warning message is generated to remind the user to pay close attention to the battery status; when the cell pressure is greater than or equal to the second warning pressure, a second-level warning message is generated to remind the user to immediately stop using the battery and perform professional maintenance.

[0075] Preferably, the intelligent pressure control system of the battery pack can be linked with the vehicle's intelligent driving system. For example, when a high-level warning of cell pressure is received, the vehicle can automatically decelerate, find a safe place to park, or activate the backup power unit to reduce the risk of accidents caused by battery failure.

[0076] According to another specific embodiment of this application, a vehicle is also provided, the vehicle including the battery pack in the above embodiments.

[0077] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0078] 1. The first movable beam 2 divides the housing 1 into a first chamber 11 and a second chamber 12. The battery cell 4 is located in the first chamber 11, and the battery cell 4 abuts against the first movable beam 2. That is, the first movable beam 2 serves as a support frame for the battery cell 4 and does not occupy the installation space of the battery cell 4, thus improving the space utilization of the battery pack. The driving component 3 is located in the second chamber 12. The driving component 3 drives the first movable beam 2 to move to adjust the volume of the first chamber 11. That is, the driving component 3 can autonomously adjust the volume of the first chamber 11 according to the expansion of the battery cell 4, thereby achieving dynamic adjustment of the battery cell pressure. The above battery pack, through the cooperation of the first movable beam 2 and the driving component 3, achieves the adjustment of the installation space of the battery cell 4 to release the expansion pressure of the battery cell 4, thereby improving the cycle life and energy density of the battery pack.

[0079] 2. The cooperation between the first movable beam 2 and the driving component 3 can eliminate the need for expansion foam between battery cells 4, between battery cells 4 and the first movable beam 2, and between battery cells 4 and the second movable beam 7, or reduce the thickness of expansion foam between battery cells 4, between battery cells and the first movable beam 2, and between battery cells and the second movable beam 7, thereby achieving efficient utilization of the installation space of battery cells 4 and further improving the energy density of the battery pack.

[0080] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0081] In addition to the above, it should be noted that the terms "one embodiment," "another embodiment," and "embodiment" used in this specification refer to specific features, structures, or characteristics described in connection with that embodiment, which are included in at least one embodiment described in the general description of this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in connection with any embodiment, the intention is to suggest that implementing such a feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of this invention.

[0082] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0083] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A battery pack, characterized in that, include: The housing (1) has a receiving cavity; The first movable beam (2) is disposed in the receiving cavity and is movably connected to the shell (1). The first movable beam (2) divides the receiving cavity into a first chamber (11) and a second chamber (12). The battery cell (4) is disposed in the first chamber (11) and abuts against the first movable beam (2); A driving component (3) is disposed in the second chamber (12). The driving end of the driving component (3) is connected to the first movable beam (2). The driving component (3) is used to drive the first movable beam (2) to move relative to the housing (1) to adjust the volume of the first chamber (11).

2. The battery pack according to claim 1, characterized in that, The battery pack also includes: Pressure sensor (5), the pressure sensor (5) is disposed between the battery cell (4) and the first movable beam (2), the pressure sensor (5) is used to detect the pressure of the battery cell (4); The battery management system (6) is located in the second chamber (12). The battery management system (6) is electrically connected to the drive unit (3) and the pressure sensor (5) respectively. The battery management system (6) controls the operation of the drive unit (3) according to the pressure of the battery cell (4).

3. The battery pack according to claim 1 or 2, characterized in that, The first chamber (11) is provided with a second movable beam (7), which is movably connected to the shell (1). The second movable beam (7) divides the first chamber (11) into multiple chambers, and the battery cell (4) abuts against the second movable beam (7).

4. The battery pack according to claim 1 or 2, characterized in that, The inner side of the frame of the housing (1) is provided with a guide rail, and the first movable beam (2) is slidably connected to the guide rail by a slider.

5. The battery pack according to claim 4, characterized in that, The slider is provided with a locking member, which has a locking position that cooperates with the housing (1) to lock, and an unlocking position that can move relative to the housing (1).

6. A method for controlling a battery pack, wherein the battery pack is the battery pack according to any one of claims 1-5, characterized in that, The control method includes: Obtain the cell (4) pressure of the battery pack; The pressure of the battery cell (4) is compared with the preset pressure to obtain the comparison result; A set of control strategies is generated based on the comparison results, wherein the set of control strategies includes at least one of the following: adjusting the position of the first movable beam (2) to change the volume of the first chamber (11) or keeping the position of the first movable beam (2) unchanged.

7. The control method according to claim 6, characterized in that, A set of control strategies is generated based on the comparison results, including: When the pressure of the battery cell (4) is greater than the first preset pressure and less than the second preset pressure, a first target strategy is generated in the control strategy set, wherein the first target strategy is used to control the first movable beam (2) to move along the first direction to increase the volume of the first chamber (11).

8. The control method according to claim 7, characterized in that, A set of control strategies is generated based on the comparison results, including: When the pressure of the battery cell (4) is less than or equal to the first preset pressure, a second target strategy is generated in the control strategy set, wherein the second target strategy is used to control the position of the first movable beam (2) to remain unchanged.

9. The control method according to claim 7, characterized in that, When the pressure of the battery cell (4) is greater than or equal to the second preset pressure, a warning message is generated, wherein the warning message is used to indicate that there is a risk of failure in the battery cell (4).

10. A vehicle, characterized in that, The vehicle includes the battery pack according to any one of claims 1-5.

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