Supporting device of battery, battery, battery pack, vehicle and electronic equipment

Abstract

The invention discloses a supporting device of a battery, the battery, a battery pack, a vehicle and electronic equipment, relates to the technical field of batteries, and aims to improve the supporting effect of the supporting device so as to reduce the inward collapse degree of the cylindrical center of the battery. The supporting device comprises a body and an expansion structure. The body comprises a first end and a second end, and the first end is bent in the direction close to the second end to form a reel shape. The expansion structure is arranged on at least one side of the body, the battery releases gas in the charging-discharging process, and the expansion structure is used for absorbing the gas in the battery to expand so as to support the roll core. According to the supporting device provided by the invention, the expansion structure can expand by adsorbing gas generated by charging-discharging of the battery, so that the center of the battery is supported, the deformation quantity of the battery is reduced, the center of the battery can be prevented from collapsing inwards, the service life of the battery is prolonged, and the safety performance of the battery is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery support device, a battery, a battery pack, a vehicle and an electronic device. Background Art

[0002] The core of a cylindrical battery has a hollow cylindrical center of the electrode body. After the cylindrical battery has undergone multiple charge-discharge cycles and expanded, the corresponding positions of the positive and negative electrodes in the cylindrical center are subjected to local stress, which will cause the electrodes facing each other to deform, and then cause the cylindrical center to "collapse inward". In the prior art, the support structure of the cylindrical center usually adopts a hard support, which has a poor support effect and affects the electrical performance and safety performance of the battery cell. Summary of the invention

[0003] The object of the present invention is to provide a battery support device, a battery, a battery pack, a vehicle and an electronic device, aiming to improve the supporting function of the support device to reduce the degree of inward collapse occurring in the cylindrical center of the battery.

[0004] In order to achieve the above object, the present invention adopts the following technical scheme:

[0005] On the one hand, the present invention provides a battery support device, comprising: a main body, the main body comprising a first end and a second end, the first end being bent toward the second end to form a scroll shape; an expansion structure, the expansion structure being arranged on at least one side of the main body, the battery releases gas during the charge-discharge process, and the expansion structure is used to absorb the gas inside the battery to expand so as to support the battery's roll core.

[0006] According to the battery support device of the embodiment of the present invention, the expansion structure absorbs the gas generated by the battery charge-discharge, so that the expansion structure can expand to support the center of the battery. Therefore, compared with the traditional battery, the deformation of the battery is reduced, the degree of collapse of the cylindrical center of the battery is reduced, the service life of the battery is extended, and the safety performance of the battery is improved.

[0007] In some embodiments, the expansion structure includes a first film layer and an adsorbent. The first film layer is wrapped to form a accommodating cavity, and the first film layer is used to allow gas to enter the accommodating cavity from the outside of the expansion structure; the adsorbent is arranged in the accommodating cavity, and the adsorbent is used to adsorb gas to expand the volume of the adsorbent.

[0008] In some embodiments, the expansion structure further includes a second film layer, the material of the second film layer is a ductile polymer film, and the second film layer is connected to the first film layer to form the outer surface of the expansion structure to wrap the adsorbent.

[0009] In some embodiments, the area of ​​the first film layer accounts for 20%-80% of the surface area of ​​the expanded structure; and the area of ​​the second film layer accounts for 20%-80% of the area of ​​the expanded structure.

[0010] In some embodiments, there are multiple expansion structures, and the multiple expansion structures are arranged linearly, nonlinearly, or in an array on the body.

[0011] In some embodiments, the expansion structure includes multiple connectors, one end of each of the multiple connectors is connected to the surface of the first film layer and / or the second film layer, and the other ends of each of the multiple connectors extend in a direction away from the first film layer and / or the second film layer, and the other ends of each of the multiple connectors are connected to the main body.

[0012] In some embodiments, the body is provided with a mounting hole, and the expansion structure is connected in the mounting hole.

[0013] In some embodiments, the body includes at least one polymer film.

[0014] In some embodiments, a liquid-repellent layer including a porous breathable polymer is disposed on one side of the first film layer away from the adsorbent, the ratio of the area of ​​the liquid-repellent layer to the area of ​​the expansion structure is 60%-100%, and the specific surface area of ​​the porous breathable polymer is 50 m 2 / g-3000m 2 / g.

[0015] In some embodiments, the first membrane layer is a composite of one or more of polyethylene, polytetrafluoroethylene, non-woven fabric, polyimide, polyetheretherketone, glass fiber reinforced polyester, nano-ceramic fiber, hollow fiber, nylon 66, silicone rubber, and polylactic acid.

[0016] In some embodiments, the adsorbent is a composite of one or more of porous carbon, molecular sieves, hollow fibers, foam plastics, aerogels, metal organic framework compounds, covalent organic framework compounds, porous aromatic framework compounds, and supramolecular polymers.

[0017] In some embodiments, the rupture resistance temperature F of the expansion structure satisfies: F≤300°C.

[0018] On the other hand, the present invention provides a battery, comprising: a core assembly; and a supporting device for the battery as above, wherein the supporting device is formed into a scroll shape by winding and is arranged at the center of the core assembly.

[0019] In yet another aspect, the present invention provides a battery pack, comprising: the battery as above; or the supporting device of the battery as above.

[0020] On the other hand, the present invention provides a vehicle, comprising the battery pack as above; or the battery as above; or the supporting device of the battery as above.

[0021] On the other hand, the present invention provides an electronic device, including the battery pack as above; or the battery as above; or the battery supporting device as above.

[0022] It can be understood that the beneficial effects that can be achieved by the battery support device, battery, battery pack and vehicle provided by the above embodiments of the present invention can refer to the beneficial effects of the support device described above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 A schematic diagram of a structure of a battery provided according to some embodiments;

[0025] Figure 2 is another structural schematic diagram of a battery provided according to some embodiments;

[0026] Figure 3 is another structural schematic diagram of a battery provided according to some embodiments;

[0027] Figure 4 A schematic diagram of a first structure of a support device provided according to some embodiments;

[0028] Figure 5 A second structural schematic diagram of a supporting device provided according to some embodiments;

[0029] Figure 6 A third structural schematic diagram of a supporting device provided according to some embodiments;

[0030] Figure 7 A fourth structural schematic diagram of a supporting device provided according to some embodiments;

[0031] Figure 8 A fifth structural schematic diagram of a supporting device provided according to some embodiments;

[0032] Fig. 9 A sixth structural schematic diagram of a supporting device provided according to some embodiments;

[0033] Fig.10 A seventh structural schematic diagram of a supporting device provided according to some embodiments;

[0034] Fig.11 for Fig.10 The enlarged view of the A part shown in the middle circle;

[0035] Fig.12 A schematic diagram of the structure of a vehicle provided according to some embodiments;

[0036] Fig.13 A schematic diagram of the structure of an electronic device provided according to some embodiments.

[0037] Reference numerals:

[0038] 100. Support device;

[0039] 1. body; 11. first end; 12. second end; 2. expansion structure; 21. first film layer; 22. second film layer; 23. adsorption element; 24. connection element; 25. accommodation chamber;

[0040] 200. Battery;

[0041] 201, core assembly;

[0042] 300, battery pack;

[0043] 400. Vehicles;

[0044] 500. Electronic equipment. DETAILED DESCRIPTION

[0045] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in some embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments provided by the present disclosure, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present disclosure.

[0046] In the description of the present disclosure, it is necessary to understand that the terms "center", "left", "right", "inside", "outside", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present disclosure 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 cannot be understood as a limitation on the present disclosure.

[0047] Unless the context requires otherwise, throughout the specification and claims, the term "including" is to be interpreted as an open, inclusive meaning, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "exemplarily" or "some examples" and the like are intended to indicate that specific features, structures, materials or characteristics associated with the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0048] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0049] When describing some embodiments, the expressions "coupled" and "connected" and their derivatives may be used. For example, when describing some embodiments, the term "connected" may be used to indicate that two or more components are in direct physical or electrical contact with each other. For another example, when describing some embodiments, the term "coupled" may be used to indicate that two or more components are in direct physical or electrical contact. However, the term "coupled" may also refer to two or more components that are not in direct contact with each other, but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the contents of this document.

[0050] In the context of this disclosure, the meanings of “on,” “above,” and “over” should be interpreted in the broadest manner, so that “on” means not only “directly on something,” but also includes the meaning of “on something” with intervening features or layers therebetween, and “above” or “over” means not only “above” or “over” something, but also includes the meaning of “above” or “over” something without intervening features or layers therebetween (i.e., directly on something).

[0051] In the content of the present disclosure, the term "layer" refers to a material portion including an area with thickness. The layer can extend over the entire underlying structure or superstructure, or can have a range smaller than the underlying structure or superstructure. In addition, the layer can be a region of a homogeneous or non-homogeneous continuous structure, and its thickness is less than the thickness of the continuous structure. For example, the layer can be located between the top surface and the bottom surface of the continuous structure or between any pair of horizontal planes at the top surface and the bottom surface of the continuous structure. The layer can extend horizontally, vertically and / or along a tapered surface. The substrate can be a layer, one or more layers can be included therein, and / or one or more layers can be provided thereon, above it and / or below it. The layer can include multiple layers. For example, the interconnect layer can include one or more conductors and contact layers (wherein interconnect lines and / or vertical interconnect path (via) contacts are formed) and one or more dielectric layers.

[0052] Exemplary embodiments are described herein with reference to cross-sectional views and / or plan views that are idealized exemplary drawings. In the drawings, the thickness of the layers and the area of ​​the regions are exaggerated for clarity. Therefore, variations in the shapes relative to the drawings due to, for example, manufacturing techniques and / or tolerances are conceivable. Therefore, the exemplary embodiments should not be interpreted as being limited to the shapes of the regions shown herein, but include shape deviations due to, for example, manufacturing. For example, an etched region shown as a rectangle will typically have curved features. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to illustrate the actual shapes of the regions of the device, and are not intended to limit the scope of the exemplary embodiments.

[0053] The supporting device 100 is described in detail below.

[0054] On the one hand, if Figure 3-Figure 9 As shown, the present invention provides a supporting device 100 for a battery 200 , comprising a body 1 and a swelling structure 2 .

[0055] Specifically, the body 1 includes a first end 11 and a second end 12, and the first end 11 is bent toward the second end 12 to form a scroll shape. The expansion structure 2 is fixed to at least one side of the body 1 by hot melting. The battery 200 releases gas during the charge-discharge process, and the expansion structure 2 is used to absorb the gas inside the battery 200 to expand and support the battery's roll core.

[0056] For example, in Figure 1-Figure 8 In the example, the shape of the body 1 is a rectangle, and the first end 11 and the second end 12 are respectively located in the width direction of the body 1 (for example, Figure 4The first end 11 is bent toward the second end 12 so that the first end 11 and the second end 12 are in contact, and the body 1 is formed into a scroll shape, that is, the top cross-sectional view of the body 1 is circular, so that the body 1 can be inserted into the cylindrical center of the battery 200. The expansion structure 2 expands by absorbing the gas released by the battery 200, so that the volume occupied by the expansion structure 2 increases, and the pressure inside the expansion structure 2 is greater than the pressure outside, so that the expansion structure 2 has a certain supporting force and can support the battery 200 in the cylindrical center. When the battery 200 is deformed after multiple charge-discharges, the expansion structure 2 can support the battery 200, reduce the deformation of the battery 200, and reduce the degree of internal collapse of the battery 200.

[0057] It should be noted that in the related art, the battery cells of existing cylindrical batteries are mainly formed into a cylindrical shape by winding the positive electrode sheet, the separator, and the negative electrode sheet. When winding, the battery cell needs to be wound onto the winding needle of the winding machine. When the winding is completed, the winding needle is pulled out from the electrode core. At this time, the battery cell of the cylindrical battery will have a hollow cylindrical center of the electrode body. When the cylindrical center of the electrode body of the cylindrical battery is not placed in a supporting device, after 1,000 cycles, the number of internal collapsed layers of the cylindrical battery cell is greater than or equal to 15 layers.

[0058] In the implementation mode of this application, please refer to Figure 2 , insert the support device 100 into the cylindrical center of the battery 200. At this time, the expansion structure 2 has not absorbed the gas, the expansion structure 2 has not expanded, and the weight of the support device 100 is relatively light. Figure 1 When the battery 200 releases gas after charging and discharging, the expansion structure 2 can absorb the gas to expand its volume, so that the support device 100 can provide a supporting force to the columnar center of the battery 200 to reduce the deformation of the columnar center of the battery 200. Thus, the number of layers of the columnar center of the battery 200 that collapse inward can be avoided to be less than or equal to 3 layers.

[0059] Such an arrangement enables the cylindrical center of the battery 200 to be supported by the supporting device 100 , which can reduce the degree of inward collapse of the center of the battery 200 , and also reduce the stress on the battery 200 , thereby extending the service life of the battery 200 and improving the safety performance of the battery 200 .

[0060] According to the supporting device 100 of the battery 200 of the embodiment of the present invention, the expansion structure 2 is made to absorb the gas generated by the charge-discharge of the battery 200, so that the expansion structure 2 can expand to support the center of the battery 200. Therefore, compared with the traditional battery, the deformation of the battery 200 is reduced, the degree of inward collapse of the cylindrical center of the battery 200 is reduced, the service life of the battery 200 is extended, and the safety performance of the battery 200 is improved.

[0061] In some embodiments, reference Figure 4 The expansion structure 2 includes a first film layer 21 and an adsorbent 23. The first film layer 21 is wrapped to form a receiving cavity 25. The first film layer 21 is used to allow gas to enter the receiving cavity 25 from the outside of the expansion structure 2. The adsorbent 23 is arranged in the receiving cavity 25 and is used to adsorb gas to expand the volume of the adsorbent 23.

[0062] like Figure 4 As shown, after the first film layer 21 is wrapped, the internal accommodating cavity 25 is formed, so that the adsorbent 23 can be placed in the accommodating cavity 25. The first film layer 21 adopts a semipermeable membrane with good gas permeability and electrolyte permeability. As a result, the gas can pass through the first film layer 21 from the outside of the expansion structure 2 to enter the accommodating cavity 25, but the gas cannot pass through the first film layer 21 from the inside of the accommodating cavity 25 to the outside of the expansion structure 2. In this way, when the battery 200 generates gas during charging and discharging, there is also gas in the center of the battery 200, and the gas can enter the accommodating cavity 25 through the first film layer 21, so that the adsorbent 23 begins to expand after adsorbing the gas, and then the expansion structure 2 expands. The pressure of the accommodating cavity 25 of the expansion structure 2 is greater than the internal air pressure of the battery 200, so that the expansion structure 2 can generate pressure on the surrounding battery 200 pole side wall, so as to support the pole side wall of the battery 200, prevent the pole side wall of the battery 200 from collapsing, prevent the pole short circuit inside the battery 200, and improve the safety performance of the battery 200.

[0063] In some embodiments, the expansion structure 2 further includes a second film layer 22 , the material of the second film layer 22 is a ductile polymer film, and the second film layer 22 is connected to the first film layer 21 to form the outer surface of the expansion structure 2 to wrap the adsorbent 23 .

[0064] For example, in Figure 4 In the example, the second film layer 22 is spliced ​​and wrapped with the first film layer 21 to form a receiving cavity 25. Since the polymer film of the second film layer 22 is ductile, when the adsorbent 23 adsorbs gas, the volume of the adsorbent 23 expands, and the pressure in the receiving cavity 25 is greater than the internal air pressure of the battery 200. The inner surface of the second film layer 22 can swell after being subjected to pressure, thereby increasing the volume of the expansion structure 2. In this way, the expansion structure 2 can be prevented from rupturing, ensuring that the expansion structure 2 can expand normally and support the cylindrical center of the battery cell.

[0065] In the embodiment of the present application, the specific splicing method of the first film layer 21 and the second film layer 22 is not limited to meet different needs.

[0066] In some embodiments, the area of ​​the first film layer 21 accounts for 20%-80% of the surface area of ​​the expansion structure 2 , and the area of ​​the second film layer 22 accounts for 20%-80% of the surface area of ​​the expansion structure 2 .

[0067] When the ratio of the area of ​​the first film layer 21 to the surface area of ​​the expansion structure 2 is less than 20%, and the ratio of the area of ​​the second film layer 22 to the surface area of ​​the expansion structure 2 is greater than 80%, the area of ​​the first film layer 21 is smaller and the area of ​​the second film layer 22 is larger, and the gas cannot efficiently enter the accommodating cavity 25 from the outside of the expansion structure 2, which slows down the speed of volume expansion of the expansion structure 2 and also reduces the supporting role of the expansion structure 2.

[0068] When the ratio of the area of ​​the first film layer 21 to the surface area of ​​the expansion structure 2 is greater than 80%, and the ratio of the area of ​​the second film layer 22 to the surface area of ​​the expansion structure 2 is less than 20%, the area of ​​the first film layer 21 is relatively large, which can ensure that the gas quickly passes through the first film layer 21 into the accommodating cavity 25, so that the volume of the adsorbent 23 expands. However, the area of ​​the second film layer 22 is relatively small, and it is impossible to ensure that the expansion structure 2 can expand smoothly. The first film layer 21 and the second film layer 22 may rupture due to insufficient ductility, resulting in the inability to support the cylindrical center of the battery 200.

[0069] When the ratio of the area of ​​the first film layer 21 to the surface area of ​​the expansion structure 2 is 20%-80%, and the ratio of the area of ​​the second film layer 22 to the surface area of ​​the expansion structure 2 is 20%-80%, the areas of the first film layer 21 and the second film layer 22 are moderate, and the gas can smoothly enter the accommodating cavity 25. When the adsorbent 23 expands after adsorbing the gas, the second film layer 22 can also bulge, causing the volume of the expansion structure 2 to expand, so that the expansion structure 2 can exert pressure on the central side wall of the battery 200, thereby improving the support effect on the cylindrical center of the battery 200.

[0070] For example, when the ratio of the area of ​​the first film layer 21 to the surface area of ​​the expansion structure 2 is 50%, and the ratio of the area of ​​the second film layer 22 to the surface area of ​​the expansion structure 2 is 50%, the expansion of the expansion structure 2 can be satisfied and the supporting function can be realized, so as to ensure that the columnar center of the battery 200 can be supported and extend the service life of the battery 200.

[0071] For example, when the ratio of the area of ​​the first film layer 21 to the surface area of ​​the expansion structure 2 is 40%, and the ratio of the area of ​​the second film layer 22 to the surface area of ​​the expansion structure 2 is 60%, the first film layer 21 and the second film layer 22 can also constitute the surface layer of the expansion structure 2, so that the adsorbent 23 can be wrapped by the first film layer 21 and the second film layer 22. When the battery 200 releases gas during charge-discharge, the gas can pass through the first film layer 21 into the accommodating cavity 24, and the adsorbent 23 can absorb the gas, so that the expansion structure 2 expands, and the expansion structure 2 can support the cylindrical center of the battery 200.

[0072] In some embodiments, reference Figure 4-Figure 9The number of expansion structures 2 is multiple, and the multiple expansion structures 2 are arranged linearly or nonlinearly or in an array on the body 1. Therefore, when the body 1 is wound to form a scroll shape, the expansion structures 2 are arranged at intervals in the circumferential direction of the body 1 to support the circumferential direction of the cylindrical center of the battery 200, reduce the stress on the cylindrical center of the battery 200, and reduce wear.

[0073] For example, in Figure 5 In the example shown in FIG. 1 , the number of the expansion structures 2 is twelve.

[0074] For example, in Figure 6 In the example of FIG. 1 , the number of the expansion structures 2 is 6.

[0075] For example, in Figure 7 In the example of FIG. 1 , the number of the expansion structures 2 is four.

[0076] For example, in Figure 3 In the example, the number of expansion structures 2 is 2. The above expansion structures 2 are arranged in an array on the main body 1. With such a configuration, different numbers of expansion structures 2 can be used according to the capacity of the columnar center of the battery 200, so that the support device 100 can be inserted into the columnar center of the battery 200, so that the support device 100 can support the columnar center of the battery 200. As a result, after 1000 cycles of the battery 200, the number of internal collapse layers can be reduced from 15 layers to 0-3 layers, thereby improving the safety performance of the battery 200 and extending the service life of the battery 200.

[0077] In the implementation manner of the present application, different numbers of expansion structures 2 can be selected according to actual conditions to meet different usage requirements.

[0078] In some embodiments, reference Figure 8 and Fig. 9 The expansion structure 2 includes a plurality of connectors 24, one end of each of the plurality of connectors 24 is connected to the surface of the first film layer 21 and / or the second film layer 22, and the other ends of each of the plurality of connectors 24 extend in a direction away from the first film layer 21 and / or the second film layer 22, and the other ends of each of the plurality of connectors 24 are connected to the main body 1.

[0079] Exemplarily, there are two connectors 24 corresponding to one expansion structure 2, and the two connectors 24 are respectively arranged on both sides of the expansion structure 2. The shape of the connector 24 is rectangular. The connector 24 is connected to the body 1, so that the expansion structure 2 is connected to the body 1, which improves the structural strength of the support device 100 and prevents the expansion structure 2 from falling from the body 1. When the body 1 is wound to form a reel shape, the expansion structure 2 can be arranged at intervals in the circumferential direction of the body 1, thereby enhancing the supporting function of the support device 100.

[0080] Among them, Figure 8 and Fig. 9 As shown, the surface areas of the expansion structure 2 may also be different, so that the expansion structure 2 may have different expansion volumes to achieve different supporting capabilities.

[0081] In other embodiments, Figure 1 and Fig.10 As shown, the main body 1 is provided with a mounting hole, and the expansion structure 2 is connected in the mounting hole. By opening the mounting hole on the main body 1, the surface of the expansion structure 2 is tightly connected to the circumference of the mounting hole, so that the main body 1 is connected with the expansion structure 2, so that when the main body 1 is rolled, the expansion structure 2 is also located in the circumference of the main body 1, and the connection strength between the main body 1 and the expansion structure 2 is strengthened. In addition, the expansion structure 2 can expand on both sides of the main body 1, thereby improving the supporting function of the supporting device 100.

[0082] In some embodiments, the body 1 includes at least one layer of polymer film. The polymer film is a thin film made of organic polymer. By using the polymer film, the winding of the body 1 is facilitated, which is beneficial to improving production efficiency and reducing production costs. Figure 4 and Figure 5 As shown, the body 1 may be a single-layer structure. The expansion structure 2 is connected to the body 1 in the thickness direction (for example, Figure 4 one side of the up-down direction).

[0083] like Fig.10 and Fig.11 As shown, the body 1 has two layers of polymer films. The connector 24 of the expansion structure 2 is located between the two layers of polymer films of the body 1. In this way, the body 1 is connected to the connector 24, and then the body 1 is connected to the expansion structure 2, so that the body 1 and the expansion structure 2 can be rolled together. Therefore, when the expansion structure 2 expands, the expansion structure 2 can swell on both sides of the body 1, thereby improving the support strength of the expansion structure 2.

[0084] It should be noted that the expansion structure and the body may be connected by bonding or hot melting.

[0085] In some embodiments, a liquid-repellent layer including a porous breathable polymer is provided on one side of the first film layer 21 away from the adsorbent 23, the ratio of the area of ​​the liquid-repellent layer to the area of ​​the expansion structure is 60%-100%, and the specific surface area of ​​the porous breathable polymer is 50m 2 / g-3000m 2 The porous air-permeable polymer has air permeability and liquid repellency. The liquid repellent layer made of the porous air-permeable polymer material can allow gas to pass through but cannot allow liquid to pass through.

[0086] Since the battery 200 contains electrolyte, the lyophobic layer is mainly made of a lyophobic material to prevent the electrolyte from passing through the lyophobic layer into the accommodation cavity 25, and also to prevent other liquids from entering the accommodation cavity 25. The lyophobic layer can be disposed on the outer side of the first film layer 21 by coating or bonding, which is convenient for production and reduces costs.

[0087] By coating the first film layer 21 with a lyophobic layer, the electrolyte cannot pass through the first film layer 21, and the electrolyte cannot enter the accommodating cavity 25, so as to ensure that the expansion structure 2 can be supported normally. When the ratio of the area of ​​the lyophobic layer to the area of ​​the expansion structure is less than 60%, the area of ​​the lyophobic layer is too small, and it cannot be ensured that no electrolyte enters the accommodating cavity 25 from the first film layer 21. When the ratio of the area of ​​the lyophobic layer to the area of ​​the expansion structure is greater than 100%, the area of ​​the lyophobic layer is too large, which increases the production cost. As a result, the ratio of the area of ​​the lyophobic layer to the area of ​​the expansion structure is 60%-100%, thereby ensuring that the liquid does not pass through the first film layer 21 into the accommodating cavity 25, and also controlling the production cost.

[0088] The specific surface area of ​​the porous breathable polymer is the surface area per gram of the porous breathable polymer material. A large specific surface area means that the particles of the porous breathable polymer material are small. When the specific surface area of ​​the porous breathable polymer is less than 50 m 2 / g, the specific surface area of ​​the porous gas-permeable polymer is too small to ensure the liquid-repellent property of the liquid-repellent layer, which may cause the electrolyte or other liquids to enter the receiving cavity 25. When the specific surface area of ​​the porous gas-permeable polymer is greater than 3000 m 2 / g, the specific surface area of ​​the porous air-permeable polymer is too large, which increases the production cost. 2 / g-3000m 2 / g, which can not only ensure the lyophobicity of the lyophobic layer and prevent the electrolyte or other liquids from entering the containing cavity 25, but also control the production cost.

[0089] In some optional embodiments, the specific surface area of ​​the porous breathable polymer is preferably within 200 m 2 / g-500m 2 / g, and also better meet the requirements of liquid repellency and control costs.

[0090] In some embodiments, the first film layer 21 is a composite of one or more of polyethylene, polytetrafluoroethylene, non-woven fabric, polyimide, polyetheretherketone, glass fiber reinforced polyester, nano-ceramic fiber, hollow fiber, nylon 66, silicone rubber, and polylactic acid.

[0091] Among them, materials such as polytetrafluoroethylene have extremely excellent chemical stability and weather resistance, are resistant to most strong acids, strong alkalis, oils and organic solvents, and have natural strong liquid repellency.

[0092] When the first film layer 21 is made of polytetrafluoroethylene, or is a composite of polytetrafluoroethylene and the above-mentioned other materials, the semi-permeability of the first film layer 21 can be improved, ensuring that the gas can pass through the first film layer 21 smoothly, so that the adsorbent 23 can smoothly adsorb the gas, thereby ensuring that the expansion structure 2 can expand to support the columnar center of the battery 200.

[0093] In some embodiments, Figure 4 As shown, the adsorbent 23 is a composite of one or more of porous carbon, molecular sieve, hollow fiber, foam plastic, aerogel, metal organic framework compound, covalent organic framework compound, porous aromatic framework compound, and supramolecular polymer.

[0094] The above materials all have strong adsorption properties, and can improve the adsorption properties of the adsorbent 23, so that the adsorbent 23 can adsorb gas and expand in volume.

[0095] In some embodiments, the rupture resistance temperature F of the expansion structure 2 satisfies: F≤300°C. When the battery 200 has thermal runaway, the battery cells inside the battery 200 cannot work normally, and the temperature inside the battery 200 will rise. When the temperature reaches above 300°C, the first film layer 21 and the second film layer 22 will rupture due to heat resistance, so that the gas inside the adsorbent 23 and the expansion structure 2 is released, and the gas inside the battery 200 is released. Therefore, when the operating temperature of the battery 200 is below 300°C, the expansion structure 2 can work normally, and the support device 100 can play a supporting role normally.

[0096] Optionally, the rupture resistance temperature of the expansion structure 2 may be between 130°C and 200°C. The expansion structure 2 may use materials with different rupture resistance temperatures according to different batteries 200 used, to ensure that the expansion structure 2 will not rupture below 130°C, and to ensure normal charge-discharge of the battery 200. When the battery 200 has thermal runaway, the expansion structure 2 can be ensured to rupture to release the gas inside the battery 200, to ensure safe use.

[0097] On the other hand, for example, Figure 1 and Figure 2 In the example, the present invention provides a battery 200, including a core assembly 201 and a supporting device 100 for the battery 200 as described above.

[0098] Specifically, the support device 100 is formed into a reel shape by winding and is arranged at the center of the core assembly 201. The core assembly 201 is arranged in the battery 200, and the core assembly 201 has a hollow cylindrical center. The support device 100 is arranged at the center of the core assembly 201 to support the core assembly 201. Therefore, when the core assembly 201 releases gas during charging and discharging, and the core assembly 201 collapses, the support device 100 can support the core assembly 201 to prevent the battery 200 from short-circuiting and improve the safety performance of the battery 200.

[0099] According to the battery 200 of the embodiment of the present invention, the supporting device 100 is used to support the winding core assembly 201 to prevent the battery 200 from short-circuiting, thereby improving the safety performance of the battery 200.

[0100] On the other hand, Fig.13 As shown, the present invention provides a battery pack 300 including a battery 200; or a supporting device 100 for the battery 200.

[0101] In this way, the battery pack 300 can improve the safety performance of the battery pack 300 and extend the service life of the battery pack 300 by using the battery 200 with the support device 100, or the battery pack 300 includes the support device 100.

[0102] On the other hand, Fig.12 As shown, a vehicle 400 of the present invention includes a battery pack 300 as described above; or a battery 200 as described above; or a supporting device 100 for the battery 200 as described above.

[0103] As a result, the safety performance of the vehicle 400 can be improved and the energy consumption of the battery 200 can be reduced, thereby increasing the endurance of the vehicle 400 and improving the user's usage efficiency.

[0104] On the other hand, Fig.13 As shown, an electronic device 500 of the present invention includes the battery pack 300 as described above; or the battery 200 as described above; or the supporting device 100 of the battery 200 as described above.

[0105] As a result, the safety performance of the electronic device 500 can be improved, and the energy consumption of the battery 200 can be reduced, thereby increasing the battery life of the electronic device 500 and improving the user's usage efficiency.

[0106] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A battery (200) supporting device (100), characterized in that: include: A body (1), the body (1) comprising a first end (11) and a second end (12), the first end (11) being bent in a direction close to the second end (12) to form a scroll shape; An expansion structure (2) is provided on at least one side of the body (1); the battery (200) releases gas during the charge-discharge process; the expansion structure (2) is used to absorb the gas expansion inside the battery (200) to support the winding core of the battery.

2. The battery (200) support device (100) according to claim 1, characterized in that: The expansion structure (2) comprises a first film layer (21) and an adsorbent (23); the first film layer (21) is wrapped to form a receiving cavity (25); the first film layer (21) is used to allow the gas to enter the receiving cavity (25) from the outside of the expansion structure (2); The adsorbent (23) is disposed in the accommodating chamber (25), and the adsorbent (23) is used to adsorb gas so as to expand the volume of the adsorbent (23).

3. The battery (200) support device (100) according to claim 2, characterized in that: The expansion structure (2) further comprises a second film layer (22), the material of the second film layer (22) being a ductile polymer film, and the second film layer (22) is connected to the first film layer (21) to form the outer surface of the expansion structure (2) so as to wrap the adsorbent (23).

4. The battery (200) support device (100) according to claim 3, characterized in that: The area of ​​the first film layer (21) accounts for 20%-80% of the surface area of ​​the expansion structure (2); The area of ​​the second film layer (22) accounts for 20%-80% of the area of ​​the expansion structure (2).

5. The battery (200) supporting device (100) according to claim 1, characterized in that: The number of the expansion structures (2) is multiple, and the multiple expansion structures (2) are arranged linearly, nonlinearly, or in an array on the body (1).

6. The battery (200) support device (100) according to claim 2, characterized in that: The expansion structure (2) comprises a plurality of connectors (24), one end of each of the plurality of connectors (24) is connected to the surface of the first film layer (21) and / or the second film layer (22), and the other end of each of the plurality of connectors (24) extends in a direction away from the first film layer (21) and / or the second film layer (22), and the other end of each of the plurality of connectors (24) is connected to the body (1).

7. The battery (200) supporting device (100) according to claim 6, characterized in that: The main body (1) is provided with a mounting hole, and the expansion structure (2) is connected in the mounting hole.

8. The battery (200) supporting device (100) according to claim 6, characterized in that: The body (1) comprises at least one layer of polymer film.

9. The battery (200) supporting device (100) according to claim 2, characterized in that: A liquid-repellent layer comprising a porous breathable polymer is provided on a side of the first film layer (21) away from the adsorbent (23), the ratio of the area of ​​the liquid-repellent layer to the area of ​​the expansion structure (2) is 60%-100%, and the specific surface area of ​​the porous breathable polymer is 50 m 2 / g-3000m 2 / g.

10. The battery (200) supporting device (100) according to claim 2, characterized in that: The first membrane layer (21) is one or a composite of multiple materials selected from the group consisting of polyethylene, polytetrafluoroethylene, non-woven fabric, polyimide, polyetheretherketone, glass fiber reinforced polyester, nano-ceramic fiber, hollow fiber, nylon 66, silicone rubber, and polylactic acid.

11. The battery (200) supporting device (100) according to claim 2, characterized in that: The adsorbent (23) is one or a combination of porous carbon, molecular sieve, hollow fiber, foam plastic, aerogel, metal organic framework compound, covalent organic framework compound, porous aromatic framework compound, supramolecular polymer.

12. The battery (200) supporting device (100) according to claim 3, characterized in that: The rupture resistance temperature F of the expansion structure (2) satisfies: F≤300°C.

13. A battery (200), characterized in that: include: A winding core assembly (201); According to the supporting device (100) of the battery (200) according to any one of claims 1 to 12, the supporting device (100) is formed into a scroll shape by winding and is arranged at the center of the winding core assembly (201).

14. A battery pack (300), characterized in that: include: A battery (200) according to claim 13; or a supporting device (100) for a battery (200) according to any one of claims 1 to 12.

15. A vehicle (400), characterized in that: A supporting device (100) comprising a battery pack (300) according to claim 14; or a battery (200) according to claim 13; or a battery (200) according to any one of claims 1-12.

16. An electronic device (500), characterized in that: A supporting device (100) comprising a battery pack (300) according to claim 14; or a battery (200) according to claim 13; or a battery (200) according to any one of claims 1-12.

Images