Battery module capable of adjusting battery cell pressure

Abstract

The invention discloses a battery module capable of adjusting battery cell pressure, which belongs to the technical field of batteries and comprises a sealing shell, a fluid medium, a pressure adjusting mechanism and a control unit. An accommodating cavity is formed in the sealing shell and is used for accommodating the battery cell structure; the accommodating cavity is filled with the fluid medium, the battery cell structure is immersed in the fluid medium, and the fluid medium is used for applying pressure to the outer surface of the battery cell structure; the pressure adjusting mechanism is communicated with the fluid medium in the accommodating cavity and is used for changing the pressure of the fluid medium; the control unit is connected with the pressure adjusting device, and the control unit can adjust the output pressure of the pressure adjusting mechanism based on the state signal of the battery module. According to the battery module, the whole outer surface of the battery cell structure is uniformly wrapped by the fluid medium, so that pressure is synchronously applied in three-dimensional directions, an omnibearing isostatic pressing effect required by the battery cell is realized, the battery cell structure is ensured to be always in an optimal pressure environment, the cycle life of the battery is prolonged, and the safety and reliability of the battery are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery module capable of adjusting the pressure of battery cell. BACKGROUND

[0002] In the field of new energy today, lithium-ion power battery has become the key power source for many application scenarios, especially electric vehicles, due to its excellent performance. With the continuous progress of technology, lithium-ion power battery is gradually developing from liquid to semi-solid and solid in order to pursue higher energy density.

[0003] At present, there are mainly three packaging forms of lithium battery cell, namely soft package, square shell and cylinder. Among them, soft package and square shell battery need to apply certain pressure to the large surface of the battery cell when the system is converted into a battery system, so that the positive and negative electrode plates can be in close contact, thereby reducing the resistance and effectively improving the cycle life of the battery. In addition, when the lithium battery is charged, the graphite negative electrode will expand due to the intercalation of lithium, resulting in an increase in volume. Applying pressure can limit the volume change and prevent damage to the mechanical structure of the module or battery system. In addition, during the repeated charging and discharging process of the battery, as the service life decays, the positive and negative electrode plates will become thicker and larger. Applying external pre-tightening force in advance can inhibit this expansion and volume change, thereby prolonging the service life of the battery.

[0004] However, in the process of lithium battery development from liquid to semi-solid and solid, on the one hand, with the increase of energy density, the negative electrode material begins to use silicon material, which has an expansion rate of up to 400%, much higher than the expansion rate of 100% of graphite negative electrode. Lithium metal negative electrode material also has an expansion coefficient of 300%, which requires more precise and effective pressure control to cope with greater volume changes. On the other hand, in the full solid-state battery system, the pressure demand increases significantly, up to 600Mpa. Only one-way pressure cannot meet the actual demand, and isostatic pressure needs to be applied in three dimensions. Based on the above two points, the previous simple initial pre-tightening method cannot meet the needs of current technological development. SUMMARY

[0005] The purpose of the present application is to provide a battery module capable of adjusting the pressure of battery cell, in order to solve the technical problem in the prior art that the initial pre-tightening method cannot meet the needs of precise control of battery cell pre-tightening pressure and full-directional isostatic pressure application.

[0006] As conceived above, the technical solution adopted by the present application is:

[0007] A battery module capable of adjusting the pressure of battery cell, comprising:

[0008] A sealed shell having an accommodation cavity inside, the accommodation cavity being used to accommodate a battery cell structure;

[0009] a fluid medium filled in the accommodating cavity and immersed in the cell structure, the fluid medium being used to apply pressure to the outer surface of the cell structure;

[0010] a pressure regulating mechanism in communication with the fluid medium in the accommodating cavity, used to change the pressure of the fluid medium;

[0011] a control unit connected with the pressure regulating device, the control unit being capable of adjusting the output pressure of the pressure regulating mechanism based on a state signal of the battery module.

[0012] As a preferred, the fluid medium is insulating oil, the kinematic viscosity of which at 40℃ is >20cst, the kinematic viscosity of which at 100℃ is >100cst, the flash point of which is >250℃, the breakdown voltage of which is >47kV, the volume resistivity of which at 30℃ is >300Mohm.m, and the dielectric constant of which at 20℃ is <2.

[0013] As a preferred, the control unit is a battery management system, and the state signal includes at least one of a state of health or a state of charge.

[0014] As a preferred, the pressure regulating mechanism includes:

[0015] a hydraulic pump used to regulate the pressure of the fluid medium in the accommodating cavity;

[0016] a pressure sensor used to monitor the pressure of the fluid medium.

[0017] As a preferred, the pressure regulating mechanism is arranged in the accommodating cavity, or arranged outside the accommodating cavity.

[0018] As a preferred, a liquid level sensor is arranged in the accommodating cavity, the liquid level sensor being used to monitor the liquid level of the fluid medium in the accommodating cavity and generate a prompt information.

[0019] As a preferred, the pressure regulating mechanism further includes an external liquid storage tank in communication with the accommodating cavity through an external pipeline, the external liquid storage tank being used to store the fluid medium and capable of injecting the fluid medium into the accommodating cavity through the external pipeline.

[0020] As a preferred, a partition plate is arranged in the sealed shell, the partition plate separating the accommodating cavity into a plurality of independent sub-pressure cavities, each sub-pressure cavity being connected with an independent pressure regulating mechanism, the pressure regulating mechanism being used to individually control the pressure of the fluid medium in the corresponding sub-pressure cavity.

[0021] As a preferred, the cell structure is fixed to the accommodating cavity through a honeycomb-shaped support, the honeycomb-shaped support being provided with a plurality of fluid channels on the surface, and the fluid medium being capable of passing through the fluid channels.

[0022] As preferred, a temperature adjusting mechanism is arranged in the accommodating cavity for adjusting the temperature of the fluid medium in the accommodating cavity.

[0023] Advantages of the present application:

[0024] The battery module with adjustable cell pressure provided by the present application has a sealed shell providing a closed and stable accommodating cavity to accommodate the cell structure, protecting the cell from external environmental interference and ensuring its stable operation. By immersing the cell structure in the fluid medium in the accommodating cavity and utilizing the pressure adjusting mechanism to work with the control unit, the limitations of the initial pre-tightening method in the prior art are effectively overcome. The fluid medium can uniformly wrap the entire outer surface of the cell structure, thereby synchronously applying pressure in three-dimensional directions to achieve the required omnidirectional isostatic pressure effect of the cell structure, especially adapting to the requirements of high-energy density semi-solid and solid batteries for high-value and multi-dimensional pressure. The pressure adjusting mechanism can actively change the pressure of the fluid medium according to actual needs, so that the pressure applied to the cell structure can be flexibly adjusted and is no longer limited to the initial set value. The control unit can drive the pressure adjusting mechanism to change the output pressure in real time or on demand by receiving and responding to the state signals during the operation of the battery module, thereby dynamically and accurately matching the changing pressure requirements of the cell structure due to charging and discharging, material expansion, and aging attenuation throughout the life cycle of the battery module, ensuring that the cell structure is always in the optimal pressure environment, effectively inhibiting the excessive expansion of the cell, reducing the internal resistance, and improving the cycle life and safety reliability of the battery module. BRIEF DESCRIPTION OF DRAWINGS

[0025] Fig. 1 is an exploded structural schematic view of the battery module with adjustable cell pressure provided by the embodiment of the present application;

[0026] Fig. 2 is a structural schematic view of the battery module with adjustable cell pressure provided by the embodiment of the present application;

[0027] Fig. 3 is a sectional view of the battery module with adjustable cell pressure provided by the embodiment of the present application.

[0028] In the drawings:

[0029] 100, cell structure;

[0030] 1, sealed shell; 10, accommodating cavity; 2, pressure adjusting mechanism; 21, hydraulic pump; 22, external pipeline. DETAILED DESCRIPTION

[0031] Embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0032] In the description of the present application, unless explicitly defined and limited otherwise, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] In the present application, unless explicitly defined and limited otherwise, "on" or "under" the first feature of the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0034] The technical solutions of the present application are further illustrated below by specific embodiments in conjunction with the drawings.

[0035] Referring to Figs. 1 to 3 The battery module provided by the embodiment of the present application can adjust the pressure of the battery cell, which comprises a sealed shell 1, a fluid medium, a pressure adjusting mechanism 2 and a control unit. The sealed shell 1 has a containing cavity 10 inside, which is used to accommodate the battery cell structure 100; the fluid medium is filled in the containing cavity 10 and immerses the battery cell structure 100, and the fluid medium is used to apply pressure to the outer surface of the battery cell structure 100; the pressure adjusting mechanism 2 communicates with the fluid medium in the containing cavity 10, and is used to change the pressure of the fluid medium; the control unit is connected with the pressure adjusting device, and the control unit can adjust the output pressure of the pressure adjusting mechanism 2 based on the state signal of the battery module.

[0036] The battery module with adjustable cell pressure provided by the application, the sealed shell 1 provides a closed and stable accommodating cavity 10 to accommodate the cell structure 100, protects the cell from external environmental interference, and ensures its stable work. By immersing the cell structure 100 in the fluid medium in the accommodating cavity 10, and using the pressure adjusting mechanism 2 to work with the control unit, the limitations of the initial pre-tightening method in the prior art are effectively overcome. The fluid medium can uniformly wrap the entire outer surface of the cell structure 100, thereby synchronously applying pressure in three-dimensional directions, achieving the required all-around isostatic pressure effect of the cell structure 100, especially adapting to the requirements of high-energy density semi-solid and solid batteries for high-value and multi-dimensional pressure. The pressure adjusting mechanism 2 can actively change the pressure of the fluid medium according to actual needs, so that the pressure applied to the cell structure 100 can be flexibly adjusted and is no longer limited to the initial set value. The control unit can drive the pressure adjusting mechanism 2 to change the output pressure in real time or on demand by receiving and responding to the state signals in the battery module running process, thereby dynamically and accurately matching the changing pressure requirements of the cell structure 100 due to charging and discharging, material expansion and aging attenuation throughout the life cycle of the battery module, so as to ensure that the cell structure 100 is always in the optimal pressure environment, effectively inhibits the excessive expansion of the cell, reduces the internal resistance, and improves the cycle life and safety and reliability of the battery module.

[0037] Specifically, the fluid medium is insulating oil, the insulating oil has a kinematic viscosity of >20cst at 40℃, a kinematic viscosity of >100cst at 100℃, a flash point of >250℃, a breakdown voltage of >47kV, a volume resistivity of >300Mohm.m at 30℃, and a dielectric constant of <2 at 20℃.

[0038] The insulating oil has good insulation performance, a breakdown voltage of >47kV, can effectively prevent electrical short circuit in the battery module, ensure safe and stable operation of the electrical system of the battery module, and avoid affecting the performance of the battery module or even causing safety accidents due to problems such as electric leakage. The insulating oil has a kinematic viscosity of >20cst at 40℃ and a kinematic viscosity of >100cst at 100℃, which can ensure that the insulating oil has appropriate fluidity under different temperature conditions, can maintain a certain fluidity at a lower temperature to ensure uniform pressure transmission, and can maintain appropriate viscosity at a higher temperature to prevent excessive flow of the oil and effectively apply pressure, thereby stably applying uniform pressure to the outer surface of the cell structure 100 at all times. The high flash point (flash point >250℃) makes the insulating oil not easy to flash in the case of heat generated by the operation of the battery module, thereby improving the safety of the battery module. The volume resistivity of >300Mohm.m further ensures the insulation performance and prevents current leakage. The dielectric constant of <2 can reduce the polarization of the oil caused by the electric field, avoid adversely affecting the electric field distribution in the battery module, ensure that the cell works in a stable electric field environment, and help to improve the overall performance and reliability of the battery module.

[0039] In other embodiments, the fluid medium can also be inert gas, silica gel, etc., without limitation, as long as it can apply uniform pressure to the outer surface of the cell structure 100.

[0040] Preferably, a partition is arranged in the sealed housing 1, which divides the accommodation cavity 10 into multiple independent sub-pressure cavities, and each sub-pressure cavity is connected to an independent pressure adjusting mechanism 2 for individually controlling the pressure of the fluid medium in the corresponding sub-pressure cavity. The provision of independent pressure adjusting mechanisms 2 for each sub-pressure cavity enables the system to implement differentiated pressure regulation according to the actual state of the cell structure 100 at different positions in the accommodation cavity 10, such as uneven expansion caused by temperature gradient, aging degree, or charging and discharging state difference. This sub-area independent control mechanism effectively avoids the damage to the cell structure 100 or the failure of expansion suppression caused by local overpressure or underpressure in the traditional overall pressure application mode, and is particularly suitable for the realistic demand of performance discretization of the cell structure 100 in large modules. At the same time, the pressures of the sub-pressure cavities do not interfere with each other, and when a single-area pressure adjusting mechanism 2 fails or needs maintenance, the remaining areas can still maintain a stable three-dimensional isostatic pressure environment, thereby enhancing the operational redundancy and overall reliability of the system.

[0041] Preferably, the cell structure 100 is fixed to the accommodation cavity 10 by a honeycomb-shaped support, and a plurality of fluid channels are formed on the surface of the honeycomb-shaped support, through which the fluid medium can pass. The honeycomb-shaped support provides a stable and uniform support structure for the cell structure 100, and the regularly arranged honeycomb cells effectively disperse the stress generated by the cell expansion or external load, avoiding deformation or damage of the cell structure 100 caused by local stress concentration, and ensuring the structural integrity of the cell structure 100 in a high-pressure environment. At the same time, the fluid channels distributed on the surface of the support construct a three-dimensional flow network throughout the accommodation cavity 10, ensuring that the fluid medium can penetrate and fully wrap all the outer surfaces of each cell structure 100 without obstruction, eliminating dead angles in pressure transmission. This design enables the static pressure applied by the fluid medium to quickly and uniformly cover all parts of the cell structure 100. In addition, the inherent lightweight property of the honeycomb structure reduces the overall weight of the battery module, and its regular geometric shape also facilitates precise positioning and efficient assembly of the cells, improving the convenience of production and manufacturing.

[0042] The pressure adjusting mechanism 2 communicates with the fluid medium in the accommodation cavity 10 and is used to change the pressure of the fluid medium. The pressure adjusting mechanism 2 is arranged in the accommodation cavity 10, or arranged outside the accommodation cavity 10.

[0043] When the pressure regulating mechanism 2 is arranged in the accommodating cavity 10, the pressure regulating mechanism 2 can directly act on the fluid medium in the accommodating cavity 10, reduce energy loss and delay in the pressure transmission process, realize more rapid and accurate regulation of the cell pressure, help to respond to the state change of the battery module in time, and meet the demand of the cell for rapid pressure adjustment. Moreover, this arrangement can make the battery module structure more compact, save space, and be conducive to the reasonable layout of other components in limited space.

[0044] If the pressure regulating mechanism 2 is arranged outside the accommodating cavity 10, it is convenient to install, maintain and overhaul the pressure regulating mechanism 2, reduces the difficulty and cost of maintenance, and the operator can operate the pressure regulating mechanism 2 without opening the sealed shell 1, thereby improving the maintenance efficiency. At the same time, arranging the pressure regulating mechanism 2 outside the accommodating cavity 10 can also reduce the occupation of the space around the cell by the pressure regulating mechanism 2, avoid the influence of the existence of the pressure regulating mechanism 2 on the layout of the cell structure 100 or the interference with the cell, and be conducive to optimizing the utilization of the internal space of the battery module and ensuring the stability and reliability of the overall performance of the battery module.

[0045] Specifically, the pressure regulating mechanism 2 includes a hydraulic pump 21 and a pressure sensor. The hydraulic pump 21 is used to regulate the pressure of the fluid medium in the accommodating cavity 10, and the pressure sensor is used to monitor the pressure of the fluid medium. The hydraulic pump 21 as a positive pressure source can positively increase or reversely reduce the pressure of the fluid medium in the accommodating cavity 10 according to the actual demand, realize dynamic and bidirectional regulation of the pressure applied to the cell structure 100, and thus flexibly cope with the real-time change of the pressure demand of the cell due to material expansion or aging in the charging and discharging process. The pressure sensor continuously and accurately monitors the actual pressure value of the fluid medium, and provides a key real-time feedback signal for the entire pressure control system. The two cooperate with the control unit to form a closed pressure regulating loop, so that the pressure applied to the cell structure 100 can be accurately and stably maintained within the set target range, effectively avoiding the problems of damage to the cell structure 100 due to excessive pressure or insufficient pressure to effectively inhibit expansion, and optimizing the response speed, stability and reliability of the pressure control.

[0046] And, the accommodation cavity 10 is configured with a liquid level sensor, which is used to monitor the liquid level of the fluid medium in the accommodation cavity 10 and generate prompt information. The liquid level sensor can monitor the liquid level of the fluid medium in the accommodation cavity 10 in real time. Once the liquid level is abnormal, whether it is the internal pressure imbalance caused by the too high liquid level, affecting the accuracy of pressure regulation, or the situation that the part of the battery cell structure 100 cannot be effectively supported by the pressure, thereby affecting the battery performance, the liquid level sensor can sense in time. By generating prompt information, the operator is reminded or feedback to the control unit, so that timely measures can be taken. Thus, it helps to ensure the uniformity and stability of the pressure exerted by the fluid medium on the outer surface of the battery cell structure 100, and avoids the influence of the liquid level problem on the regulation effect of the battery module on the battery cell pressure.

[0047] Among them, the liquid level sensor can be selected from a floating ball type liquid level sensor, an ultrasonic liquid level sensor or a capacitive liquid level sensor, etc. All are related devices in the field, and their working principles and specific structures are not described here.

[0048] In addition, the accommodation cavity 10 is configured with a temperature adjusting mechanism for adjusting the temperature of the fluid medium in the accommodation cavity 10. When the battery module is working, the temperature change will affect the physical properties of the fluid medium, such as viscosity, etc. By adjusting the temperature of the fluid medium through the temperature adjusting mechanism, it can ensure that it maintains appropriate viscosity under different working conditions, so that the pressure is uniformly and stably applied to the outer surface of the battery cell structure 100, effectively coping with the expansion or contraction of the battery cell structure caused by temperature change, and improving the accuracy of pressure regulation. And, the appropriate temperature helps to maintain the good working state of the battery cell. The temperature adjusting mechanism can avoid the accumulation of heat generated by battery charging and discharging, prevent high temperature from causing irreversible damage to the battery cell, and prolong the service life of the battery cell.

[0049] Among them, the temperature adjusting mechanism can be selected from a refrigeration sheet, a circulating water cooling system or a heating wire, etc. All are related devices in the field, and their working principles and specific structures are not described here.

[0050] Preferably, the pressure regulating mechanism 2 further comprises an external storage tank connected to the accommodating cavity 10 through the external pipeline 22, which is used to store the fluid medium and can inject the fluid medium into the accommodating cavity 10 through the external pipeline 22. The external storage tank can store a certain amount of fluid medium, which can be injected into the accommodating cavity 10 in time when the fluid medium in the accommodating cavity 10 is insufficient due to various reasons such as micro leakage, volume change caused by temperature change, etc., so as to maintain the amount of fluid medium in the cavity stable and ensure that the pressure applied to the battery cell structure 100 is continuous and uniform, thereby avoiding the influence of uneven pressure caused by the lack of fluid medium on the performance of the battery module. At the same time, this design makes it more convenient to fill the fluid medium in the battery module initially or to maintain and replace it, which can directly inject from the external storage tank to the accommodating cavity 10 without complex internal operation. In addition, the relatively independent setting of the external storage tank facilitates the management and monitoring of the fluid medium, such as quality inspection, supplement of additives, etc., which helps to ensure that the fluid medium is always in good condition.

[0051] The control unit is connected with the pressure regulating device, and the control unit can adjust the output pressure of the pressure regulating mechanism 2 based on the state signal of the battery module. As the control unit, the battery management system has powerful data processing and analysis capabilities and can accurately collect and analyze various data in the operation of the battery module. When the battery health state is used as the state signal, the battery management system can adjust the output pressure of the pressure regulating mechanism 2 in real time according to the health condition information such as the aging degree and internal resistance change of the battery cell. When the battery cell ages, it may need more pressure to maintain performance, and the battery management system can increase the pressure in time to ensure the stable performance of the battery module and prolong the service life. When the state signal is the state of charge, the battery cell expands significantly during the charging process of the battery, and the battery management system can master the expansion degree of the battery cell in real time according to the state of charge, and adjust the pressure in time to avoid the influence of improper pressure on the charging effect or cause damage to the battery cell. In this way, based on the state signal such as the battery health state or the state of charge, the battery management system can flexibly and accurately control the pressure, effectively solving the problem of inaccurate pressure control in the prior art, and comprehensively ensuring the stable and efficient operation of the battery module in different working stages.

[0052] It can be understood that the battery management system uses the existing BMS system to realize its functions, and the specific structure and conventional working principle of the battery management system itself belong to the known technology in the art, which will not be described in detail here.

[0053] The above embodiments only illustrate the basic principles and characteristics of the present application, and the present application is not limited to the above embodiments. Without departing from the spirit and scope of the present application, various changes and modifications can be made to the present application, and these changes and modifications all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A battery module with adjustable cell pressure, characterized in that, include: A sealed housing (1) has an internal accommodating cavity (10) for accommodating a battery cell structure (100); A fluid medium is filled in the accommodating cavity (10) and submerges the cell structure (100), the fluid medium being used to apply pressure to the outer surface of the cell structure (100); The pressure regulating mechanism (2) is in communication with the fluid medium in the accommodating cavity (10) and is used to change the pressure of the fluid medium; The control unit is connected to the pressure regulating device and can adjust the output pressure of the pressure regulating mechanism (2) based on the status signal of the battery module.

2. The battery module with adjustable cell pressure according to claim 1, characterized in that, The fluid medium is an insulating oil with a kinematic viscosity of >20 cst at 40°C, a kinematic viscosity of >100 cst at 100°C, a flash point of >250°C, a breakdown voltage of >47 kV, a volume resistivity of >300 Mohm.m at 30°C, and a dielectric constant of <2 at 20°C.

3. The battery module with adjustable cell pressure according to claim 1, characterized in that, The control unit is a battery management system, and the status signal includes at least one of battery health status or state of charge.

4. The battery module with adjustable cell pressure according to claim 1, characterized in that, The pressure regulating mechanism (2) includes: A hydraulic pump (21) is used to regulate the pressure of the fluid medium in the accommodating cavity (10); A pressure sensor is used to monitor the pressure of the fluid medium.

5. The battery module with adjustable cell pressure according to claim 1, characterized in that, The pressure regulating mechanism (2) is disposed inside the accommodating cavity (10) or outside the accommodating cavity (10).

6. The battery module with adjustable cell pressure according to claim 1, characterized in that, A liquid level sensor is disposed in the accommodating cavity (10), which is used to monitor the liquid level of the fluid medium in the accommodating cavity (10) and generate prompt information.

7. The battery module with adjustable cell pressure according to claim 1, characterized in that, The pressure regulating mechanism (2) also includes an external liquid storage tank connected to the accommodating cavity (10) via an external pipe (22). The external liquid storage tank is used to store the fluid medium and can inject the fluid medium into the accommodating cavity (10) via the external pipe (22).

8. The battery module with adjustable cell pressure according to claim 1, characterized in that, The sealed housing (1) is provided with a partition, which divides the accommodating cavity (10) into multiple independent sub-pressure chambers. Each sub-pressure chamber is connected to an independent pressure regulating mechanism (2), which is used to individually control the pressure of the fluid medium in the corresponding sub-pressure chamber.

9. The battery module with adjustable cell pressure according to claim 1, characterized in that, The cell structure (100) is fixed to the accommodating cavity (10) by a honeycomb bracket. The honeycomb bracket has multiple fluid channels on its surface, through which the fluid medium can pass.

10. The battery module with adjustable cell pressure according to claim 1, characterized in that, The accommodating cavity (10) is equipped with a temperature regulating mechanism for regulating the temperature of the fluid medium inside the accommodating cavity (10).

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