Battery cell structure, battery device and electric equipment

Abstract

The invention discloses a battery cell structure, a battery device and electric equipment, the battery cell structure comprises a shell, a battery cell part and a pressure relief part, a first area for fixing the pressure relief part and a second area for accommodating free electrolyte are arranged on a bottom plate part, the free electrolyte cannot be sprayed out along with airflow during thermal runaway, and the free electrolyte cannot be sprayed out along with the airflow during thermal runaway. Free electrolyte is prevented from contacting with high-temperature flue gas, the electrolyte is prevented from contacting with high-temperature particles or open fire to cause combustion, the possibility of fire caused by thermal runaway of the battery is reduced, the safety of the battery is improved, the problems of electrolyte leakage and the like caused by thermal expansion of the shell can be avoided, the free electrolyte can be prevented from randomly flowing inside and outside the battery core, and the service life of the battery core is prolonged. And the problems of internal short circuit or local overheating and the like of the battery cell caused by non-uniform distribution of the electrolyte are avoided, so that the stability and the consistency of the battery cell are favorably maintained, the battery can keep relatively good performance in the charging and discharging processes, and the energy density and the cycle life of the battery are improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly relates to a battery cell structure, a battery device, and an electrical device using the same. Background Art

[0002] In a battery, free electrolyte refers to the part of the electrolyte that does not undergo chemical reactions or physical adsorption with electrode materials and is in a free state.

[0003] In the initial stage of thermal runaway, the temperature inside the battery rises, and the free electrolyte will undergo a series of exothermic reactions with the electrode materials. This will further exacerbate the increase in the internal temperature of the battery and promote the development of thermal runaway. The free electrolyte will decompose at high temperatures to generate heat, and a large amount of combustible gas will be produced during the decomposition process. As the internal temperature of the battery rises, the heat conduction of the free electrolyte will cause the temperature of the separator to rise rapidly. When the temperature reaches the thermal shrinkage temperature or melting point of the separator material, the separator will shrink or melt, resulting in direct contact between the positive and negative electrodes inside the battery or forming a short circuit through a tiny channel. The formation of a short circuit will instantaneously generate a huge current, triggering a more intense exothermic reaction, causing the battery temperature to rise sharply, accelerating the process of thermal runaway, and causing serious safety accidents.

[0004] Currently adopted measures include adding flame retardants or using non-flammable solvents. Flame retardants can decompose during thermal runaway to generate some non-flammable gases, such as carbon dioxide, nitrogen, etc., to dilute the concentration of combustible gases inside the battery, and using some non-flammable or flame-retardant solvents to replace traditional flammable organic solvents. For example, fluorinated solvents have high thermal stability and are difficult to burn, and can reduce the flammability of the electrolyte to a certain extent and reduce the risk of electrolyte combustion during thermal runaway.

[0005] However, during battery thermal runaway, the current discharge path of the free electrolyte in the battery is still the safety valve or the exhaust channel. The gas and free electrolyte generated during thermal runaway are discharged mixed, and there are still great difficulties in thermal runaway management and potential safety hazards. Summary of the Invention

[0006] In view of the defects existing in the prior art, the present application provides a battery cell structure, a battery device, and an electrical device using the same to solve the problem that the thermal runaway gas flow cannot be separated from the free electrolyte in the prior art.

[0007] The above object of the present application is mainly achieved through the following technical solutions:

[0008] A battery cell structure, the battery cell structure comprising:

[0009] A housing, including a bottom plate member and a plurality of side plate members fixedly arranged around the bottom plate member, the bottom plate member and the side plate members enclosing to form an accommodation space;

[0010] The battery cell component is disposed within the accommodating space;

[0011] The pressure relief component is disposed on the bottom plate component and can communicate the accommodating space with the exterior of the housing;

[0012] Moreover, the bottom plate component has a first area for fixing the pressure relief component and a second area for accommodating free electrolyte, so that the free electrolyte can gather in the second area and be separated from the pressure relief component.

[0013] In an alternative embodiment, the thickness of the first area is greater than the thickness of the second area, so that a first partition for accommodating the free electrolyte is formed on the second area.

[0014] In an alternative embodiment, the first area is arranged in the middle of the bottom plate component, and the second area is annular and arranged between the first area and the side plate component.

[0015] In an alternative embodiment, the second area is arranged in the middle of the bottom plate component, and the second area is arranged in a mesh pattern on the bottom plate component.

[0016] In an alternative embodiment, an inclined guiding surface is provided on the second area, and one side edge of the guiding surface is connected to the edge of the first area for guiding the free electrolyte to gather at a target position.

[0017] In an alternative embodiment, the side of the guiding surface close to the first area is higher than the other side.

[0018] In an alternative embodiment, the first area is made of a thermally expandable material, and after being heated, the first area can expand towards the inside of the accommodating space until the top surface of the first area is higher than the top surface of the second area.

[0019] In an alternative embodiment, the second area is made of a thermally expandable material, and the thermal expansion coefficient of the first area is greater than that of the second area, so that under the same heating condition, the thickness of the first area on the bottom plate component is greater than the thickness of the second area.

[0020] Based on the same inventive concept, the present application further provides a battery device, and the battery device includes the above-mentioned battery cell structure.

[0021] Based on the same inventive concept, the present application further provides an electrical device, and the electrical device includes the above-mentioned battery cell structure, or the electrical device includes the above-mentioned battery device, and the battery cell structure can be used for storing or providing electrical energy.

[0022] Compared with the prior art, the advantages of the present application are as follows:

[0023] The battery cell structure in the present application includes a housing, a battery cell component, and a pressure relief component. The housing includes a bottom plate component and a plurality of side plate components fixedly arranged around the bottom plate component. The bottom plate component and the side plate components enclose a containing space; the battery cell component is arranged in the containing space, and the pressure relief component is arranged on the bottom plate component and can communicate the containing space with the outside of the housing. The bottom plate component has a first area for fixing the pressure relief component and a second area for containing free electrolyte, so that the free electrolyte can gather in the second area and be separated from the pressure relief component.

[0024] When a thermal runaway occurs in the battery cell, a large amount of high-temperature gas and heat will be generated. The pressure relief component communicates the containing space with the outside of the housing, enabling the airflow generated by the thermal runaway to be discharged in time, avoiding the rupture or explosion of the housing caused by excessive pressure and temperature, thereby preventing the spread of thermal runaway in the battery module or battery pack, reducing the risks of fire and explosion, and ensuring the safety of the entire battery system. The second area on the bottom plate component is used to contain free electrolyte, which can reliably gather the free electrolyte and separate it from the pressure relief component. During thermal runaway, the free electrolyte will not be ejected together with the airflow, avoiding the contact of the free electrolyte with high-temperature flue gas and preventing the electrolyte from contacting high-temperature particulate matter or open fire to cause combustion, further reducing the possibility of fire caused by battery thermal runaway and improving the safety of the battery. In addition, after separating the free electrolyte from the pressure relief component and gathering it in the second area, it can also avoid problems such as electrolyte leakage caused by the thermal expansion of the housing, prevent the free electrolyte from flowing randomly inside and outside the battery cell, and avoid problems such as internal short circuit or local overheating of the battery cell caused by uneven electrolyte distribution, which helps to maintain the stability and consistency of the battery cell, enabling the battery to maintain good performance during charge and discharge, and improving the energy density and cycle life of the battery. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 It is a partial schematic diagram of the battery device provided by the embodiment of the present application;

[0027] Figure 2 It is a top view of the bottom plate component provided by the embodiment of the present application;

[0028] In the figure: 100, housing; 200, bottom plate member; 201, first region; 202, second region; 300, side plate member; 400, pressure relief member; 500, battery cell structure; 600, battery device. Detailed implementation manners

[0029] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be noted here that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation to the present invention. The specific structural and functional details disclosed herein are only used to describe the exemplary embodiments of the present invention. However, the present invention can be embodied in many alternative forms and should not be construed as being limited to the embodiments described herein.

[0030] In a battery, free electrolyte is the part of the electrolyte that does not undergo chemical reactions or physical adsorption with electrode materials, etc., and is in a free state. For example, in a lithium-ion battery, part of the electrolyte interacts with the electrode material to participate in the electrochemical reaction, and the electrolyte that does not participate in the reaction is the free electrolyte.

[0031] The free electrolyte has good fluidity and can flow freely inside the battery, thereby providing a channel for the transport of ions and contributing to the charge and discharge processes of the battery.

[0032] The chemical properties of the free electrolyte are relatively stable, but the chemical activities of free electrolytes with different compositions will vary. Some free electrolytes containing active components may undergo side reactions with other substances in the battery, affecting the battery performance and safety.

[0033] The free electrolyte has a certain conductivity and can conduct current, enabling the battery to work properly. The magnitude of the conductivity is related to factors such as the composition and concentration of the electrolyte.

[0034] As a transport medium for charge carriers such as lithium ions, the free electrolyte enables lithium ions to migrate smoothly between the positive and negative electrodes of the battery, thereby realizing the charge and discharge processes of the battery. For example, when a lithium-ion battery is charged, lithium ions are released from the positive electrode, migrate through the free electrolyte to the negative electrode, and are embedded in the negative electrode material; during discharge, the process is reversed.

[0035] The chemical activity, volatility and other characteristics of the free electrolyte will affect the safety of the battery. Some free electrolytes with high chemical activity are prone to side reactions with impurities or electrode materials in the battery, generating gases, heat, etc., increasing the risks of the battery bulging, leaking liquid, catching fire or even exploding; while free electrolytes with low volatility are relatively safer.

[0036] Battery thermal runaway refers to the phenomenon that when a battery encounters abnormal conditions (such as overcharging, short circuit, external high temperature, etc.), the internal temperature rises rapidly, leading to a series of chain reactions such as electrolyte decomposition, gas release, and internal pressure increase, and may ultimately cause the battery to catch fire or explode.

[0037] In the initial stage of thermal runaway, the internal temperature of the battery rises, and the free electrolyte will undergo a series of exothermic reactions with the electrode materials. For example, in a lithium-ion battery, the organic solvent in the free electrolyte reacts with the lithium metal or lithiated graphite on the surface of the negative electrode, releasing a large amount of heat, further exacerbating the increase in the internal temperature of the battery and promoting the development of thermal runaway.

[0038] The free electrolyte will undergo decomposition reactions at high temperatures, and the decomposition process itself will also generate heat. For common carbonate electrolytes, when the temperature exceeds a certain threshold, thermal decomposition will occur, generating some low-molecular-weight organic substances and gases, and releasing heat at the same time, causing the internal temperature of the battery to continue to rise and be difficult to control.

[0039] As the internal temperature of the battery rises, the heat conduction effect of the free electrolyte will cause the temperature of the separator to rise rapidly. When the temperature reaches the thermal shrinkage temperature or melting point of the separator material, the separator will shrink or melt, resulting in the direct contact of the positive and negative electrodes inside the battery or the formation of a short circuit through a tiny channel. The formation of a short circuit will instantaneously generate a huge current, triggering a more intense exothermic reaction, causing the battery temperature to rise sharply and accelerating the process of thermal runaway.

[0040] During the charging and discharging process of the battery, uneven deposition of lithium ions on the surface of the negative electrode may form lithium dendrites. The presence of free electrolyte provides an ion transport channel for the growth of lithium dendrites. When the battery undergoes thermal runaway, the increase in temperature will accelerate the growth rate of lithium dendrites. The continuous growth of lithium dendrites may penetrate the separator, causing a short circuit between the positive and negative electrodes, thereby triggering a more serious thermal runaway phenomenon.

[0041] The free electrolyte decomposes during thermal runaway, generating a large amount of combustible gases such as hydrogen, methane, and ethylene. These gases accumulate inside the battery. When they reach a certain concentration and mix with air, they are extremely likely to cause combustion or even explosion when encountering the high temperature or open flame inside the battery, resulting in serious safety accidents.

[0042] In addition to releasing heat, the reaction between the free electrolyte and the electrode materials may also generate gases. For example, in a lithium-ion battery, the gases generated by the reaction of the free electrolyte with the negative electrode material, as well as the oxygen generated by the decomposition of the positive electrode material, etc. These gases are mixed with the combustible gases generated by the decomposition of the electrolyte, further increasing the risk of battery combustion and explosion.

[0043] The free electrolyte is fluid and can conduct heat between various parts inside the battery. When thermal runaway occurs, the free electrolyte will quickly conduct heat from the locally high-temperature area of the battery to other parts, causing the temperature of the entire battery to rise rapidly and accelerating the spread of thermal runaway throughout the battery. For example, in a battery module, after thermal runaway occurs in one battery cell, the free electrolyte may conduct heat to adjacent battery cells, triggering a chain reaction and resulting in thermal runaway of the entire module.

[0044] The gas generated by the decomposition of the free electrolyte and the volume expansion caused by the increase in the internal temperature of the battery will cause the internal pressure of the battery to increase rapidly. When the pressure exceeds the bearing capacity of the battery casing, the battery will bulge, rupture or even explode, further expanding the destructive power of thermal runaway. At the same time, heat and combustible gases will be released to the outside of the battery, which may trigger secondary disasters such as fires in the surrounding environment.

[0045] As Figure 1 shown, Figure 1 is a partial schematic diagram of the battery device 600 provided by the embodiment of the present application; a battery cell structure 500, the battery cell structure 500 includes a housing 100, a battery cell component and a pressure relief component 400, wherein:

[0046] The housing 100 includes a bottom plate member 200 and a plurality of side plate members 300 fixedly arranged around the bottom plate member 200, and the bottom plate member 200 and the side plate members 300 enclose a containing space.

[0047] The bottom plate member 200 is the basic part of the battery cell structure 500, which plays a role in supporting and fixing other components. It not only bears the weight of the battery cell component, but also provides a stable bottom platform for the entire battery cell structure 500.

[0048] A plurality of side plate members 300 are fixed around the bottom plate member 200 and enclose a relatively independent containing space together with the bottom plate member 200. The side plate members 300 have sufficient strength and stiffness to prevent the side plate members 300 from deforming under external pressure or impact, thereby protecting the internal battery cell component.

[0049] The containing space formed by the common enclosure of the bottom plate member 200 and the side plate members 300 is used to accommodate the battery cell component and the free electrolyte. The volume of the containing space is arranged according to the relevant parameters of the battery cell to ensure that the battery cell component can be stably placed therein and there is sufficient space to accommodate the free electrolyte.

[0050] The battery cell component is arranged in the containing space, and the battery cell component is responsible for storing and releasing electrical energy. The battery cell component usually includes components such as a positive electrode, a negative electrode, a separator and an electrolyte. The battery cell component is arranged in the containing space and is connected to the housing 100 through fixing devices (such as screws, buckles, etc.) to ensure that there is no displacement or vibration during use.

[0051] The pressure relief member 400 is arranged on the bottom plate 200 and can make the accommodation space communicate with the outside of the housing 100. When the battery cell has thermal runaway or other abnormal conditions, the pressure relief member 400 is arranged on the bottom plate 200, so that the accommodation space is communicated with the outside of the housing 100, and the high-temperature gas and pressure are discharged in time to prevent the housing 100 from rupturing or exploding. In this way, thermal runaway is prevented from spreading in the battery module or battery pack, and the risk of fire and explosion is reduced.

[0052] like Figure 1 , Figure 2 As shown, Figure 2 The bottom plate 200 provided in the embodiment of the present application has a top view, and the bottom plate 200 has a first area 201 on which the pressure relief member 400 is fixed, and a second area 202 for accommodating free electrolyte, so that the free electrolyte can be collected in the second area 202 and separated from the pressure relief member 400.

[0053] The bottom plate 200 has a first area 201 on which a pressure relief member 400 is fixed. The pressure relief member 400 is installed and fixed on the first area 201. The bottom plate 200 is also provided with a second area 202 for accommodating free electrolyte. The second area 202 collects and isolates the free electrolyte to prevent the free electrolyte from contacting the pressure relief member 400, thereby avoiding secondary hazards caused by thermal runaway. In the event of thermal runaway, the free electrolyte will not be ejected along with the airflow, preventing the free electrolyte from contacting external high-temperature particles or open flames to cause combustion, further reducing the possibility of fire caused by thermal runaway of the battery.

[0054] The battery cells will generate heat during the charging and discharging process, and the heat can be dissipated more easily through a reasonable structural design of the housing 100. The existence of the pressure relief member 400 not only helps to discharge the thermal runaway gas, but also promotes air circulation to a certain extent, removes the heat generated by the battery cells, helps to maintain the battery cells working within a suitable temperature range, and improves the performance and life of the battery.

[0055] Separating the free electrolyte from the pressure relief member 400 can avoid potential problems caused by contact between the free electrolyte and the pressure relief member 400 due to thermal expansion of the housing 100, such as electrolyte leakage, and ensure the sealing and reliability of the battery.

[0056] The collection and isolation of free electrolyte can prevent it from flowing freely inside the battery cell, avoiding problems such as internal short circuit or local overheating of the battery cell caused by uneven distribution of electrolyte. It helps to maintain the stability and consistency of the battery cell, so that the battery can maintain good performance during the charge and discharge process, and improve the energy density and cycle life of the battery.

[0057] The centralized accommodation of the free electrolyte makes it more convenient to detect and maintain the free electrolyte during the use of the battery. For example, through simple visual inspection or a small amount of sampling analysis, the state and composition changes of the free electrolyte can be understood, potential problems can be discovered in a timely manner, and corresponding measures can be taken, such as replenishing the electrolyte, replacing damaged components, etc., to extend the service life of the battery.

[0058] Since this structural design can effectively prevent serious damage caused by battery thermal runaway and reduce the maintenance and replacement frequency due to battery failures. At the same time, the convenient detection and maintenance methods also help to reduce the maintenance cost and improve the economy and reliability of the battery system.

[0059] In an optional embodiment, the working principle of the battery cell structure 500 in the present application is as follows: The battery cell structure 500 includes a housing 100, a battery cell component, and a pressure relief component 400. The housing 100 includes a bottom plate component 200 and a plurality of side plate components 300 fixedly arranged around the bottom plate component 200. The bottom plate component 200 and the side plate components 300 enclose an accommodation space; the battery cell component is arranged in the accommodation space, and the pressure relief component 400 is arranged on the bottom plate component 200 and can communicate the accommodation space with the outside of the housing 100. The bottom plate component 200 has a first area 201 for fixing the pressure relief component 400 and a second area 202 for accommodating the free electrolyte, so that the free electrolyte can be collected in the second area 202 and separated from the pressure relief component 400.

[0060] Such as Figure 1 、 Figure 2As shown, when the battery cell undergoes thermal runaway, a large amount of high-temperature gas and heat are generated. The pressure relief component 400 is connected between the accommodation space and the outside of the housing 100, enabling the airflow generated by thermal runaway to be discharged in a timely manner, preventing the housing 100 from cracking or exploding due to excessive pressure and temperature, thereby preventing the spread of thermal runaway within the battery module or battery pack, reducing the risks of fire and explosion, and ensuring the safety of the entire battery system. The second area 202 on the bottom plate component 200 is used to accommodate free electrolyte, and can reliably collect the free electrolyte, separating the free electrolyte from the pressure relief component 400. During thermal runaway, the free electrolyte will not be ejected together with the airflow, avoiding contact between the free electrolyte and high-temperature flue gas, and preventing the electrolyte from contacting high-temperature particulate matter or open fire to cause combustion, further reducing the possibility of fire caused by battery thermal runaway and improving the safety of the battery. Additionally, after separating the free electrolyte from the pressure relief component 400 and collecting it in the second area 202, problems such as electrolyte leakage caused by thermal expansion of the housing 100 can be avoided, preventing the free electrolyte from flowing randomly inside and outside the battery cell, and avoiding problems such as internal short circuit or local overheating of the battery cell caused by uneven distribution of the electrolyte, which helps to maintain the stability and consistency of the battery cell, enabling the battery to maintain good performance during charge and discharge, and improving the energy density and cycle life of the battery.

[0061] As Figure 1 , Figure 2 shown, in an alternative embodiment, the thickness of the first area 201 is greater than the thickness of the second area 202, so as to form a first partition on the second area 202 that can accommodate the free electrolyte.

[0062] By increasing the thickness of the first area 201, more stable structural support can be provided to ensure that the installation and function of the pressure relief component 400 are not affected. At the same time, the thinner second area 202 can form an accommodation space for collecting and isolating the free electrolyte to prevent it from flowing randomly inside the battery cell.

[0063] During specific layout, the thickness of the first area 201 can be designed to be 2 - 3 mm, while the thickness of the second area 202 can be designed to be 1 - 1.5 mm. This thickness difference can be achieved through dimensional manufacturing and material selection to ensure the stability and functionality of the structure.

[0064] As Figure 1 , Figure 2 shown, in an alternative embodiment, the first area 201 is arranged in the middle of the bottom plate component 200, and the second area 202 is annular and arranged between the first area 201 and the side plate component 300.

[0065] Arranging the first region 201 in the middle of the bottom plate member 200 can ensure that the pressure relief member 400 is centered, facilitating the uniform discharge of gas. The annular second region 202 can surround the first region 201 to form a continuous accommodation space, effectively collecting and isolating free electrolyte.

[0066] During specific arrangement, the first region 201 can be set as a circular or square region located at the center of the bottom plate member 200. The second region 202 can be designed as an annular region surrounding the first region 201, maintaining a certain distance from the side plate member 300 to ensure that the electrolyte can flow together smoothly.

[0067] In an alternative embodiment, the second region 202 is arranged in the middle of the bottom plate member 200, and the second region 202 is arranged in a mesh pattern on the bottom plate member 200.

[0068] The second region 202 arranged in a mesh pattern can provide a larger surface area, more effectively collecting and dispersing free electrolyte, preventing it from accumulating in a local area, thereby improving the overall safety of the battery cell.

[0069] During actual arrangement, the second region 202 can be set as a mesh structure composed of multiple small grids, and the size of each grid can be designed to be 1 - 2 mm. 2 This mesh structure can be achieved through precise stamping or etching processes to ensure that the electrolyte can be reliably confined within the second region 202.

[0070] In an alternative embodiment, an inclined guiding surface is provided on the second region 202, and one side edge of the guiding surface is connected to the edge of the first region 201 for guiding the free electrolyte to a target position.

[0071] The inclined guiding surface can utilize the gravitational force to guide the free electrolyte to a specific target position, such as the center or one side of the second region 202, further improving the management and safety of the electrolyte.

[0072] The guiding surface can be set as a slope with an inclination angle of 5 - 10 degrees. One side edge of the guiding surface is connected to the edge of the first region 201, and the other side edge extends to the center or one side of the second region 202 to ensure the smoothness and effectiveness of the guiding surface.

[0073] In an alternative embodiment, the side of the guiding surface close to the first region 201 is higher than the other side.

[0074] By designing the height difference of the guiding surface, the gravitational force can be utilized to more effectively guide the free electrolyte to the target position, preventing the electrolyte from flowing back or accumulating.

[0075] In an alternative embodiment, the first region 201 is made of a thermally expandable material, and after being heated, the first region 201 can expand towards the inside of the accommodating space until the top surface of the first region 201 is higher than the top surface of the second region 202.

[0076] In an alternative embodiment, the second region 202 is made of a thermally expandable material, and the coefficient of thermal expansion of the first region 201 is greater than that of the second region 202, so that under the same heating conditions, the thickness of the first region 201 on the bottom plate member 200 is greater than the thickness of the second region 202.

[0077] As Figure 1 、 Figure 2 shown, in specific implementation, the first region 201 can adopt materials with a relatively high coefficient of thermal expansion, such as polymers or composite materials. These materials will expand rapidly when heated, forming a raised surface. For example, the coefficient of thermal expansion of the first region 201 can be designed to be 30 - 50×10 -6 / °C to ensure significant expansion when the temperature rises.

[0078] The initial thickness of the first region 201 can be set to 3 mm, and the expanded height can reach 4 - 5 mm, ensuring that the top surface of the first region 201 is higher than the top surface of the second region 202 and ensuring the uniformity and reliability of the expansion process.

[0079] By using the thermally expandable material, the first region 201 can expand towards the inside of the accommodating space when heated, forming a raised surface. It can prevent the free electrolyte from contacting the pressure relief member 400 by physical blocking and increasing the space during thermal runaway, and at the same time provide a more stable support for the pressure relief member 400.

[0080] By designing different coefficients of thermal expansion, the expansion degrees of the first region 201 and the second region 202 are different when heated. The expansion degree of the first region 201 is greater, which can form an obvious height difference, further isolating the free electrolyte and the pressure relief member 400 and improving the safety of the battery cell.

[0081] The second region 202 can adopt materials with a relatively low coefficient of thermal expansion. These materials have a smaller expansion degree when heated, but still have a certain thermal expansion performance. For example, the coefficient of thermal expansion of the second region 202 can be designed to be 10 - 20×10 -6 / °C.

[0082] The initial thickness of the second region 202 can be set to 1.5 mm, and the height after expansion can reach 1.7 - 2.0 mm. Under the same heat - receiving conditions, the thickness of the first region 201 will be significantly greater than that of the second region 202, forming an obvious height difference to ensure the uniformity and reliability of the expansion process.

[0083] As Figure 1 , Figure 2 shown, based on the same inventive concept, the present application also provides a battery device 600. The battery device 600 includes the above - mentioned battery cell structure 500. In the battery device 600, the number and specifications of the battery cell structure 500 can be adaptively selected and configured as needed.

[0084] Based on the same inventive concept, the present application also provides an electrical device. The electrical device includes the above - mentioned battery cell structure 500, or the electrical device includes the above - mentioned battery device 600. The battery cell structure 500 can be used to store or provide electrical energy. The electrical device can include, but is not limited to, electric toys, power tools, battery cars, electric vehicles, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spaceships.

[0085] When taking a vehicle as an example to illustrate the electrical device, the vehicle can be a fuel - powered vehicle, a gas - powered vehicle, or a new - energy vehicle. The new - energy vehicle can be a pure - electric vehicle, a hybrid vehicle, or an extended - range electric vehicle, etc. The battery device 600 is disposed inside the vehicle. The battery device 600 can be disposed at the bottom, head, or tail of the vehicle. The battery device 600 can be used for power supply of the vehicle. For example, the battery can be used as the operating power source of the vehicle.

[0086] The vehicle can also include a controller for controlling the power supply of the battery device 600. For example, it is used for the working power requirements during the start, navigation, and driving of the vehicle.

[0087] In some embodiments of the present application, the battery device 600 can not only be used as the operating power source of the vehicle, but also as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0088] It should be understood that terms such as first and second are only used for distinguishing descriptions and cannot be construed as indicating or implying relative importance. Although terms such as first and second etc. can be used in this article to describe various units, these units should not be limited by these terms. These terms are only used to distinguish one unit from another. For example, the first unit can be called the second unit, and similarly, the second unit can be called the first unit, without departing from the scope of the exemplary embodiments of the present invention.

[0089] It should be understood that the term "and / or" in this text is merely a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, B exists alone, and both A and B exist simultaneously. The term " / and" in this text describes another association relationship between associated objects, indicating that two relationships can exist. For example, A / and B can represent: A exists alone, and both A and B exist. Additionally, the character " / " in this text generally indicates that the associated objects before and after are in an "or" relationship.

[0090] It should be understood that in the description of the present invention, the orientation or positional relationship indicated by terms such as "upper", "vertical", "inner", "outer", etc. is the orientation or positional relationship in which the disclosed product is customarily placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention.

[0091] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "arranged", "installed", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0092] The terms used in this text are only for describing specific embodiments and are not intended to limit the exemplary embodiments of the present invention. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms unless the context clearly indicates the contrary. It should also be understood that when the terms "comprise", "comprises", "include", and / or "includes" are used in this text, they specify the existence of the stated features, integers, steps, operations, units, and / or components, and do not exclude the existence or addition of one or more other features, quantities, steps, operations, units, components, and / or their combinations.

[0093] Specific details are provided in the following description to facilitate a complete understanding of the exemplary embodiments. However, those of ordinary skill in the art should understand that the exemplary embodiments can be implemented without these specific details. In other embodiments, well-known processes, structures, and technologies may not be shown in unnecessary detail to avoid obscuring the exemplary embodiments.

[0094] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features claimed herein.

[0095] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of the present disclosure, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art.

Claims

1. A battery cell structure, characterized in that: The battery cell structure comprises: The housing comprises a bottom plate and a plurality of side plates fixedly arranged around the bottom plate, wherein the bottom plate and the side plates are combined to form a receiving space; The electric core is arranged in the accommodation space; A pressure relief member, disposed on the bottom plate member and capable of connecting the accommodating space with the outside of the shell; Furthermore, the bottom plate has a first area on which the pressure relief member is fixed, and a second area for accommodating free electrolyte, so that the free electrolyte can be collected in the second area and separated from the pressure relief member.

2. The battery cell structure according to claim 1, characterized in that: The thickness of the first region is greater than that of the second region, so that a first partition for accommodating the free electrolyte is formed on the second region.

3. The battery cell structure according to claim 2, characterized in that: The first area is arranged in the middle of the bottom plate member, and the second area is annular and arranged between the first area and the side plate member.

4. The battery cell structure according to claim 2, characterized in that: The second area is arranged in the middle of the bottom plate, and the second area is arranged on the bottom plate in a mesh shape.

5. The battery cell structure according to claim 2, characterized in that: An inclined guide surface is provided on the second region, and one side edge of the guide surface is connected to the edge of the first region, so as to guide the free electrolyte to gather at a target position.

6. The battery cell structure according to claim 5, characterized in that: A side of the guide surface close to the first area is higher than the other side.

7. The battery cell structure according to claim 1, characterized in that: The first region is made of a heat-expandable material, and after being heated, the first region can expand toward the inside of the accommodating space until the top surface of the first region is higher than the top surface of the second region.

8. The battery cell structure according to claim 7, characterized in that: The second region is made of a thermally expandable material, and the thermal expansion coefficient of the first region is greater than that of the second region, so that under the same heating condition, the thickness of the first region on the bottom plate is greater than that of the second region.

9. A battery device, characterized in that The battery device comprises the battery cell structure according to any one of claims 1 to 8.

10. Electrical equipment, characterized in that: The electrical equipment comprises the battery cell structure according to any one of claims 1 to 8, or the electrical equipment comprises the battery device according to claim 9, and the battery cell structure can be used to store or provide electrical energy.

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