CN216213673U

CN216213673U - Battery case and battery

Info

Publication number: CN216213673U
Application number: CN202120537490.4U
Authority: CN
Inventors: 林银利; 冷利民; 喻聪; 张爽; 吴洁; 徐中领; 张耀
Original assignee: Sunwoda Electric Vehicle Battery Co Ltd
Current assignee: Xinwangda Power Technology Co ltd
Priority date: 2021-03-15
Filing date: 2021-03-15
Publication date: 2022-04-05
Anticipated expiration: 2031-03-15

Abstract

The utility model relates to a battery technology field discloses a battery case and battery, the inside gas adsorption layer that is provided with of battery case of this application, but the gas that adsorbs the side reaction and produce, it releases heat and arouses battery thermal runaway to effectively avoid oxygen and electrolyte or strong reductive negative pole to take place violent side reaction, in addition, because the gas adsorption layer sets up on battery case, rather than on the diaphragm surface, can effectively avoid influencing the electrical property of battery, can not obviously influence battery volume energy density moreover. The battery adopting the battery shell also has the advantages.

Description

Battery case and battery

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery shell and a battery.

Background

In some cases, a large amount of gas generated by side reactions contains a large amount of oxygen and combustible gas, and the possibility of deflagration of oxygen and combustible gas is high, which is an important hazard to property and personal safety. Meanwhile, under the condition that a single battery is out of control, the single battery can stretch to adjacent battery cells through heat conduction to cause the adjacent battery cells to be out of control, so that the whole battery pack is subjected to thermal stretching, and great potential safety hazards exist.

SUMMERY OF THE UTILITY MODEL

The present application is directed to solving at least one of the problems in the prior art. Therefore, the application provides a battery shell and a battery comprising the battery shell, wherein a gas adsorption layer is arranged in the battery shell, and the adjacent batteries can be effectively prevented from thermal runaway.

A battery case according to an embodiment of the first aspect of the present application includes:

the shell is provided with an inner cavity for accommodating the winding core and the electrolyte;

and the gas adsorption layer is arranged on the inner wall of the shell and used for adsorbing the gas in the inner cavity.

The battery shell of the embodiment of the first aspect of the application has at least the following beneficial effects: the inner wall of the battery shell is provided with a gas adsorption layer, so that gas generated by side reaction can be adsorbed, the risk that the pressure inside the battery is increased to cause the opening of the battery core and the deflagration of combustible gas can be effectively avoided, and the thermal runaway of adjacent batteries can be prevented.

According to some embodiments of the present application, the gas adsorption layer comprises at least one of a molecular sieve layer, an activated carbon layer, and a carbon nanotube layer.

According to some embodiments of the present application, the gas adsorption layer is a porous structure, and the porosity of the gas adsorption layer is 20-70%.

According to some embodiments of the present application, the battery case further comprises a thermal insulation layer disposed between the case and the gas adsorption layer.

According to some embodiments of the application, the thermal insulation layer is disposed on a portion of the inner wall of the housing, and the gas adsorption layer is disposed on a side of the thermal insulation layer away from the inner wall of the housing, or the gas adsorption layer is disposed on another portion of the inner wall of the housing and a side of the thermal insulation layer away from the inner wall of the housing.

According to some embodiments of the application, the gas adsorption layer is disposed on a portion of an inner wall of the case, and the battery case further includes a thermal insulation layer disposed on another portion of the inner wall of the case.

According to some embodiments of the present application, the battery case further includes a thermal insulation layer disposed on an outer wall of the case.

According to some embodiments of the present application, the battery case further comprises two thermal insulation layers, one of the two thermal insulation layers being disposed between the case and the gas adsorption layer, and the other of the two thermal insulation layers being disposed on an outer wall of the case.

According to some embodiments of the application, the battery case further comprises two thermal insulation layers, the gas adsorption layer is disposed on a portion of the inner wall of the case, one of the two thermal insulation layers is disposed on another portion of the inner wall of the case, and the other of the two thermal insulation layers is disposed on the outer wall of the case.

According to the battery of the second aspect embodiment of this application, including roll up core, electrolyte and the battery case of the above-mentioned first aspect embodiment, roll up the core with electrolyte all accepts in the inner chamber.

Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

The present application is further described with reference to the following figures and examples, in which:

FIG. 1 is a schematic cross-sectional view of a battery housing according to one embodiment of the present application;

FIG. 2 is a schematic cross-sectional view of a battery housing according to another embodiment of the present application;

FIG. 3 is a schematic perspective view of a battery housing according to one embodiment of the present application;

FIG. 4 is a schematic cross-sectional view of a housing in a battery enclosure according to one embodiment of the present application;

FIG. 5 is a schematic cross-sectional view of a housing in a battery enclosure according to another embodiment of the present application;

FIG. 6 is a schematic cross-sectional view of a housing in a battery enclosure according to another embodiment of the present application;

FIG. 7 is a schematic cross-sectional view of a housing in a battery enclosure according to another embodiment of the present application;

FIG. 8 is a schematic cross-sectional view of a housing in a battery enclosure according to another embodiment of the present application;

FIG. 9 is a schematic cross-sectional view of a housing in a battery enclosure according to another embodiment of the present application;

FIG. 10 is a schematic cross-sectional view of a housing in a battery enclosure according to another embodiment of the present application;

fig. 11 is a schematic cross-sectional view of a housing in a battery enclosure according to another embodiment of the present application.

Reference numerals:

bottom surface 100, side 200, broad face 300, casing 301, insulating layer 302, gas adsorption layer 303.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

In the description of the present application, it is to be understood that the positional descriptions, such as the directions of up, down, front, rear, left, right, etc., referred to herein are based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present application.

In the description of the present application, several means are one or more, and the above, below, within and the like are understood to include the present numbers. The description to first, second, etc. is only for the purpose of distinguishing technical features, and should not be interpreted as indicating or implying a relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of technical features indicated.

In the description of the present application, unless otherwise expressly limited, terms such as set, mounted, connected and the like should be construed broadly, and those skilled in the art can reasonably determine the specific meaning of the terms in the present application by combining the detailed contents of the technical solutions.

In the description of the present application, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

In the related technology, the oxygen absorption layer is laminated on the surface of the porous substrate layer of the diaphragm to form the diaphragm with a multilayer structure, so that the diaphragm has the capability of absorbing oxygen, the content of oxygen in the battery can be effectively reduced, the thermal runaway of the battery caused by the reaction and heat release of the oxygen can be effectively avoided, and the safety of the battery is improved. However, the above techniques have significant disadvantages: 1) the thickness of the diaphragm is increased, and the more the number of layers of the battery core diaphragm is, the more the thickness of the battery core is obviously increased, so that the volume energy density of the battery core is reduced; 2) lamination of the oxygen-absorbing layer on the surface of the separator substrate layer affects the pores and ion channels of the separator, thereby seriously affecting ion transport and electrical properties of the battery.

The application provides a battery case, be provided with the gas adsorption layer on battery case's casing, the gas that adsorbable side reaction produced, can not only effectively avoid oxygen and electrolyte or strong reductive negative pole to take place violent side reaction and release heat and arouse battery thermal runaway, can also effectively avoid combustible gas such as hydrogen and hydrocarbon gas to appear deflagration, thereby reduce the inside pressure increase of battery and lead to the risk that electric core opened valve and combustible gas deflagration, prevent that adjacent battery from taking place thermal runaway.

The shell of the battery shell can be further provided with a heat insulation layer, the heat insulation layer is made of a material which has heat insulation performance and does not react with the electrolyte and is used for insulating heat of the shell, the heat insulation layer can be arranged on the inner wall or the outer wall of the shell, and the gas adsorption layer is arranged on the inner wall of the shell in a mode of being exposed in the inner cavity so as to adsorb gas in the inner cavity. The heat insulating layer can insulate heat of adjacent batteries and avoid the temperature rise of the adjacent batteries, so that the thermal diffusion of the whole battery pack caused by thermal runaway of the adjacent batteries is prevented, and the purposes of preventing the thermal runaway and the thermal diffusion of the lithium ion battery are achieved. Fig. 1 is a schematic cross-sectional view of a battery case according to an embodiment, which is only a schematic view and is not intended to show a specific shape and size. Referring to fig. 1, the battery case according to the first embodiment of the present application includes a case 301 and a gas adsorption layer 303. The case 301 has an inner cavity for accommodating the winding core and the electrolyte, and is used for forming a battery by being packaged with the winding core and the electrolyte. The gas adsorption layer 303 is made of a material having gas adsorption properties and is disposed on the inner wall of the housing 301, so that the gas adsorption layer 303 is formed on the inner wall of the housing 301 to adsorb gas generated in the inner cavity. In addition, the gas adsorption layer 303 is arranged on the inner wall of the battery shell instead of on the surface of the diaphragm, so that the influence on the electrical property of the battery can be effectively avoided, and the volume energy density of the battery cannot be obviously influenced.

In addition, the lithium ion battery can generate gas circularly under the normal use working condition, a large amount of gas can be generated under the abuse condition to quickly increase the internal pressure of the battery, and when the internal pressure of the battery is increased to a certain degree, the battery can be opened through the response of a safety valve on the battery shell to quickly release the pressure. The safety valve can release a large amount of gas and dust at the opening moment, and great impact is formed on surrounding batteries, so that the safety of the whole battery pack is endangered. The battery shell is provided with gas adsorption layer 303 on the inner wall of shell 301, and the gas generated in the process of the side reaction can be adsorbed, so that the risk that the increase of the internal pressure of the battery leads to the opening of the battery and the deflagration of the combustible gas can be effectively avoided.

In the above embodiment, the gas adsorption layer 303 is made of a material having a gas adsorption property and not reacting with the electrolyte, the gas adsorption layer 303 has a porous structure, so that the adsorption area can be increased, and the porosity can be selected from 20 to 70% according to the adsorption requirement of the gas inside the battery. In specific implementation, the gas adsorption layer 303 may be made of a material which is light, porous and has a good gas adsorption effect, and the material can adsorb one or more of oxygen, hydrogen or hydrocarbon gas, and may be one or more composite materials, and the material is inert and does not react with the electrolyte. For example, the gas adsorption layer 303 may be made of a gas adsorbent having a relatively large specific surface area, such as molecular sieve, activated carbon, or carbon nanotube, and has a relatively good gas adsorption performance.

Specifically, the gas adsorption layer 303 may include at least one of a molecular sieve layer, an activated carbon layer, or a carbon nanotube layer, and may adsorb oxygen, hydrogen, and hydrocarbon gases. The related prior art only arranges the oxygen absorption layer, and cannot absorb the main gas substances (hydrogen and hydrocarbon) generated in the side reaction process, and the hydrogen and the hydrocarbon gas still cause the risk of opening the valve of the battery and deflagration caused by the increase of the internal pressure of the battery. And the battery case of this application sets up above-mentioned gas adsorption layer 303 at the inner wall of casing 301, and oxygen, hydrogen and the hydrocarbon gas that the adsorbable side reaction produced can not only effectively avoid oxygen and electrolyte or strong reductive negative pole to take place violent side reaction and release heat and arouse battery thermal runaway, can also reduce the risk that deflagration appears in hydrogen and the gaseous hydrocarbon of flammable type.

In the above embodiment, the thickness relationship between the housing 301 and the gas adsorption layer 303 can be configured according to the requirements of the battery energy density, the gas adsorption effect, and the like. Specifically, the thickness of the casing 301 is a, the thickness of the gas adsorption layer 303 is c, and c satisfies: 1/10-1/5, in some embodiments, c may be 1/20-1/5. For example, the thickness c of the gas adsorption layer 303 may be 0.5 to 100 μm, the porosity may be 20 to 70%, and the pore diameter may be 5 to 1000nm, and the specific parameters may be selected according to factors such as a chemical system and capacity affecting the gas production rate of the lithium ion battery cell side reaction. In this embodiment, c is 50 to 100 μm, the porosity is 50 to 70%, and the pore diameter is 200 to 600nm, and the gas adsorption layer 303 can effectively adsorb the side reaction gas of the system cell such as NCM, LCO, LFP, NCA, etc. under the parameters.

Fig. 2 is a schematic cross-sectional view of a battery case according to another embodiment of the present application, and referring to fig. 2, the battery case further includes a thermal insulation layer 302 according to the above embodiment, and the thermal insulation layer 302 is disposed between the casing 301 and the gas adsorption layer 303. Thus, the gas in the inner cavity can be adsorbed by the gas adsorption layer 303, and the heat insulation effect of the heat insulation layer 302 can effectively prevent heat from being conducted to the adjacent battery. Wherein, the heat insulating layer 302 is disposed on a part of the inner wall of the casing 301, the gas adsorption layer 303 is disposed on a side of the heat insulating layer 302 away from the inner wall of the casing 301, or the gas adsorption layer 303 is disposed on another part of the inner wall of the casing 301 and a side of the heat insulating layer 302 away from the inner wall of the casing 301.

Fig. 3 is a schematic perspective view of a battery case according to an embodiment, fig. 4 is a schematic cross-sectional view of a case in the battery case according to an embodiment of the present invention, in which the case 301 has a rectangular parallelepiped structure as an example, and is only a schematic view, and is not intended to show a specific shape, size, or scale. Referring to fig. 3 and 4, a rectangular parallelepiped housing 301 has six side walls including two opposite wide faces 300 of large area and the remaining side faces 200 and bottom face 100 of small area. Referring to fig. 4, the heat insulating layer 302 is disposed between the casing 301 and the gas adsorbing layer 303 and covers the entire inner wall of the casing 301, so that the casing 301 has a heat insulating function, and can insulate the battery attached to the casing 301 in all directions, and at this time, the gas adsorbing layer 303 may be disposed on a side of the heat insulating layer 302 away from the inner wall of the casing 301, so as to be exposed in the inner cavity to absorb the gas. The gas adsorption layer 303 can be disposed on the entire surface of the side of the heat insulation layer 302 away from the inner wall of the housing 301, so that the gas adsorption effect can be achieved on each inner wall, and the adsorption efficiency can be improved. The gas adsorption layer 303 can also be disposed on a partial surface of the side of the heat insulation layer 302 away from the inner wall of the casing 301, so that the gas in the inner cavity can be effectively adsorbed, and the occupation of the inner space of the casing 301 can be reduced.

In some embodiments, referring to fig. 5 and 6, the thermal insulation layer 302 is disposed between the casing 301 and the gas adsorption layer 303 and covers a part of the inner wall of the casing 301, so as to perform a thermal insulation function on the corresponding side of the inner wall of the casing 301, thereby thermally insulating the battery abutting against the side of the casing 301 and effectively avoiding heat diffusion. The heat insulating layer 302 may be provided on the inner wall of the wide surface 300 of the case 301, thereby insulating the battery in contact with the wide surface 300 side of the case 301. The remaining inner walls of the casing 301 (i.e., the inner walls of the casing 301 without the thermal insulation layer 302) are not provided with the thermal insulation layer 302, so that the occupation of the inner space of the casing 301 can be effectively reduced, and heat can be conducted normally, and the gas adsorption layer 303 can be arranged on one side of the thermal insulation layer 302 (as shown in fig. 5) far away from the inner wall of the casing 301, so as to be exposed in the inner cavity, thereby reducing the occupation of the inner space of the casing 301 while ensuring that the gas in the inner cavity is effectively adsorbed. Alternatively, the gas adsorbing layer 303 may be disposed on another part of the inner wall of the casing 301 and a side away from the inner wall of the casing 301 (as shown in fig. 6), so as to be exposed in the inner cavity, and thus, the gas adsorbing layer can perform a gas adsorbing function on each inner wall of the casing 301, thereby improving the adsorbing efficiency.

In some embodiments, referring to fig. 7, the battery casing includes a casing 301, a gas adsorption layer 303 and a thermal insulation layer 302, wherein the gas adsorption layer 303 is disposed on a portion of an inner wall of the casing 301, and the thermal insulation layer 302 is disposed on another portion of the inner wall of the casing 301, so that the gas adsorption layer 303 and the thermal insulation layer 302 are disposed on different inner walls of the casing 301, and excessive internal space occupation on the same side inner wall of the casing 301 can be avoided.

In the above embodiment, the casing 301 is provided with the thermal insulation layer 302 on the inner wall in various forms, which can perform corresponding thermal insulation function inside the casing 301. In some embodiments, the battery housing includes a casing 301, a gas adsorption layer 303, and two thermal insulation layers 302. The gas adsorption layer 303 is disposed on the inner wall of the casing 301 for adsorbing the gas in the inner cavity of the casing 301, wherein one of the two heat insulation layers 302 is disposed between the gas adsorption layer 303 and the casing 301 in the manner of any of the above embodiments, and the other of the two heat insulation layers 302 is disposed on the outer wall of the casing 301, thereby further enhancing the heat insulation capability of the casing 301.

Referring to fig. 8, the heat insulating layer 302 on the outer wall of the case 301 may be provided on all outer walls of the case 301, so that the entire case 301 has a heat insulating function, and can insulate the battery attached to the case 301 in each direction.

Alternatively, referring to fig. 9, a thermal insulation layer 302 located on the outer wall of the housing 301 may be disposed on the outer wall of a portion of the housing 301, and may serve as a thermal insulation on the corresponding side of the outer wall of the housing 301, so as to insulate the battery attached to the side of the housing 301. The two heat insulation layers 302 can be arranged on the inner wall and the outer wall of the shell 301 on the same two sides, so that the inner wall and the outer wall on the same side of the shell 301 have a heat insulation effect, the heat insulation effect can be effectively enhanced, and the rest inner wall and the rest outer wall of the shell 301 can conduct heat normally. For example, one of the heat insulating layers 302 is provided on the inner wall of the wide surface 300 of the case 301, and the other heat insulating layer 302 is provided on the outer wall of the wide surface 300 of the case 301, whereby both the inner wall and the outer wall of the wide surface 300 have a heat insulating function, and the battery placed on the wide surface 300 side of the case 301 can be thermally insulated.

Alternatively, referring to fig. 10, one of the thermal insulation layers 302 may be disposed on a part of the inner wall of the housing 301, for example, on the inner wall of the wide surface 300 of the housing 301, and the other thermal insulation layer 302 may be disposed on the outer wall of the side wall of the housing 301 except the wide surface 300, so as to perform a thermal insulation function at different positions of the inner wall and the outer wall of the housing 301, so that the housing 301 has a thermal insulation function as a whole, and can insulate the battery attached to the housing 301 in various directions, and reduce the occupied space inside the housing 301.

In some embodiments, referring to fig. 10, the battery enclosure comprises a housing 301, a gas adsorption layer 303, and two thermal insulation layers 302. The gas adsorption layer 303 is disposed on a portion of the inner wall of the housing 301 for adsorbing the gas in the inner cavity of the housing 301, one of the two heat insulation layers 302 is disposed on the other portion of the inner wall of the housing 301, and the other of the two heat insulation layers 302 is disposed on the outer wall of the housing 301. The heat insulation layer 302 on the outer wall of the casing 301 may be disposed on part or all of the outer wall of the casing 301, as shown in fig. 10, the gas adsorption layer 303 is disposed on the inner wall of the narrow side of the casing 301, and the heat insulation layer 302 on the inner wall of the casing 301 is disposed on the inner wall of the wide side 300 of the casing 301, so that the gas adsorption layer 303 and the heat insulation layer 302 on the inner wall of the casing 301 are disposed on different inner walls of the casing 301, and excessive internal space occupied by the inner walls on the same side of the casing 301 is avoided. The heat insulating layer 302 on the outer wall of the case 301 is provided on the outer wall of the wide surface 300 of the case 301, and thus, both the inner wall and the outer wall of the wide surface 300 have a heat insulating effect, and the battery attached to the wide surface 300 side of the case 301 can be thermally insulated. Referring to fig. 11, in some other embodiments, the battery case includes a case 301, a gas adsorption layer 303 and a heat insulation layer 302, the gas adsorption layer 303 is disposed on an inner wall of the case 301 to adsorb gas in an inner cavity of the case 301, and the heat insulation layer 302 is disposed only on an outer wall of the case 301. The heat insulation layer 302 is arranged on the outer wall of the shell 301, so that the occupation of the inner space of the shell 301 can be effectively avoided, and the heat insulation layer 302 can be arranged on the partial or whole outer wall of the shell 301 according to the actual heat insulation requirement of the battery. The gas adsorbing layer 303 is disposed on an inner wall of the housing 301, and thus exposed in the inner cavity to adsorb the gas in the inner cavity. The gas adsorption layer 303 may be disposed on all inner walls of the housing 301, so that gas adsorption can be performed on all inner walls, and the adsorption efficiency can be improved. The gas adsorption layer 303 may also be disposed on a portion of the inner wall of the housing 301, so that the gas in the inner cavity can be effectively adsorbed, and the occupation of the inner space of the housing 301 can be reduced. Thus, the gas in the inner cavity can be adsorbed by the gas adsorption layer 303, and the heat insulation effect of the heat insulation layer 302 can effectively prevent heat from being conducted to the battery case of the adjacent battery. The shell 301 without the thermal insulation layer 302 can conduct heat normally, so that heat dissipation of the battery under normal working conditions can be guaranteed, and thermal insulation under the condition of thermal runaway of the single battery can be improved. In addition, because the heat insulation layer 302 and the gas adsorption layer 303 are both arranged on the battery shell instead of on the surface of the diaphragm, the influence on the electrical property of the battery can be effectively avoided, and the volume energy density of the battery cannot be obviously influenced.

Referring to fig. 3, in the above embodiment, the thermal insulation layer 302 may also be disposed on the inner wall or the outer wall of the side surface 200 or the bottom surface 100 of the casing 301, the batteries having the casing 301 can be combined and arranged in a manner of abutting against the side surface 200 or the bottom surface 100 to form a module, the thermal insulation effect of the thermal insulation layer 302 can effectively prevent heat from being conducted to the adjacent battery casing, and the portion of the casing 301 not disposed with the thermal insulation layer 302 can conduct heat normally. In the above embodiment, the thermal insulation layer 302 may be disposed on the inner wall or the outer wall of the casing 301 by spraying or roll coating, and spraying or roll coating may be performed during the preparation of the casing 301, so that thermal insulation aerogel disposed between adjacent cells of the conventional module may be replaced, the module may be assembled more conveniently and rapidly, and the cost may be reduced. The gas adsorption layer 303 may also be disposed on the inner walls of the thermal insulation layer 302 and/or the shell 301 by spraying or roll coating, and similarly, the gas adsorption layer 303 may also be sprayed or roll coated when the shell 301 is manufactured.

Referring to fig. 2, the thickness relationship between the casing 301 and the thermal insulation layer 302 may also be configured according to the requirements of the battery volume energy density, the thermal insulation effect, and the like. For example, the thickness of the heat insulation layer 302 is b, and b/a is 1/10-1/2. The embodiment of the application selects the shell 301 with the thickness a of 200-600 mu m, and the thickness b of the heat insulation layer satisfies the following requirements: b/a is 1/5 ~ 1/2.

In the above embodiment, the thermal insulation layer 302 has thermal insulation performance and is not in contact withThe electrolyte is made of a material with reaction, and a material with light weight and low heat conductivity coefficient can be selected. The functional layer material is also inert and does not react with the electrolyte. The material having heat insulating property and not reacting with electrolyte comprises aerogel (such as SiO with nano-porous structure)₂Aerogel, etc.), organic high polymers (e.g., one or more composites of polyurethane, polystyrene, phenolic, etc.).

Wherein, the thickness b of the heat insulation layer 302 can be 20-300 μm; the specific parameters can be selected according to the heat insulation effect required to be achieved. The thickness b of the thermal insulation layer 302 of the present embodiment is 100 to 200 μm, which can achieve a better thermal insulation effect and effectively prevent the thickness of the casing 301 from being greatly increased.

The following are tests performed using several specific examples of the present application to make a battery and compare it with a conventional battery:

example 1

A thermal insulation layer 302 (phenolic resin, thickness 150 mu m) is sprayed on the inner sides of two wide surfaces of a battery shell with the conventional thickness of 8 mu m, then a gas adsorption layer 303 (molecular sieve, thickness 100 mu m, porosity of 60 percent and aperture of 500nm) is sprayed on the inner sides of the two wide surfaces of the battery shell, and the NCM523-106Ah battery sample is manufactured by adopting the battery shell.

Example 2

A heat insulation layer 302 (polyurethane, the thickness of 100 mu m) is sprayed on the inner sides of two wide surfaces of a battery shell with the conventional thickness of 8 mu m, then a gas adsorption layer 303 (a molecular sieve, the thickness of 100 mu m, the porosity of 60 percent and the pore diameter of 500nm) is sprayed on the inner sides of two wide surfaces of the battery shell, and the battery shell is adopted to manufacture NCM523-106Ah battery samples.

Example 3

A thermal insulation layer 302 (phenolic resin, thickness 150 mu m) is sprayed on the inner sides of two wide surfaces of a battery shell with the conventional thickness of 8 mu m, then a gas adsorption layer 303 (carbon nano tube, thickness 50 mu m, porosity of 50 percent and aperture of 200nm) is sprayed on the inner sides of the two wide surfaces of the battery shell, and the NCM523-106Ah battery sample is manufactured by adopting the battery shell.

Example 4

A heat insulation layer 302 (polyurethane, the thickness of which is 100 mu m) is sprayed on the inner sides of two wide surfaces of a battery shell with the conventional thickness of 8 mu m, then a gas adsorption layer 303 (carbon nano tube, the thickness of which is 50 mu m, the porosity of which is 50 percent and the pore diameter of which is 200nm) is sprayed on the inner sides of the two wide surfaces of the battery shell, and the battery shell is adopted to manufacture NCM523-106Ah battery samples.

Comparative example 1

The NCM523-106Ah battery sample is manufactured by a battery shell with the conventional thickness of 8 mu m.

The following tests were performed on the battery samples manufactured in the above specific examples 1 to 4 and comparative example 1:

overcharge test: and (3) charging the 106Ah battery 1C for 18min (130% SOC) at a constant current, and measuring the maximum value of the gas generation expansion pressure of the battery by adopting a pressure digital display in the overcharging process.

Module thermal diffusion test: 106Ah battery assembles into 1P2S simple and easy module, and the heating triggers wherein 1pcs battery thermal runaway, compares adjacent battery because thermal spread leads to the time of thermal runaway.

And (3) testing results:

and (4) test conclusion:

the improvement effect of the embodiments 1-4 is remarkable, and the gas adsorption layer 303 can effectively adsorb hydrogen and hydrocarbon gas generated in the overcharge side reaction process, so that the risks of battery valve opening and combustible gas deflagration caused by increased pressure inside the battery are effectively avoided; the thermal insulation layer 302 can effectively play a thermal insulation role, and avoid causing the temperature of the adjacent battery to rise rapidly, thereby effectively avoiding the thermal runaway spreading of the adjacent battery.

From the foregoing, the battery case of the present application, when used to manufacture a battery, has the following significant advantages over the technique of laminating oxygen-absorbing layers on the surface of the porous substrate layer of the separator and the prior art of aerogel thermal insulation:

1) the heat insulation layer 302 and the gas adsorption layer 303 are arranged on the inner side surface of the battery shell instead of the surface of the diaphragm, so that the influence on the electrical property of the battery can be effectively avoided, and the volume energy density of the battery cannot be obviously influenced;

2) the gas adsorption layer 303 can simultaneously adsorb oxygen, hydrogen and hydrocarbon gas generated in the side reaction process, and can effectively avoid the risks of battery valve opening and combustible gas deflagration caused by increase of the internal pressure of the battery;

3) the battery shell is provided with the heat insulation layer 302 with the heat insulation function, so that the heat insulation aerogel arranged between adjacent batteries of the traditional module can be replaced, the module is assembled more conveniently and rapidly, and the cost is reduced;

4) meanwhile, the heat insulation layer 302 of some embodiments of the present application is arranged on the inner side or the outer side of the contact surface (generally, the wide surface of the battery shell) of the battery shell of the adjacent battery in the module, and the heat insulation layer 302 is not arranged on the non-contact surface, so that the heat dissipation of the battery under the normal working condition can be ensured, and the heat insulation performance under the condition of thermal runaway of the single battery can also be improved.

The embodiment of the application further provides a battery, which comprises the winding core and the battery shell of the embodiment, the winding core is arranged in the inner cavity, and electrolyte is filled in the inner cavity. The gas adsorption layer 303 is arranged on the battery shell instead of the surface of the diaphragm, so that the influence on the electrical property of the battery can be effectively avoided, and the volume energy density of the battery cannot be obviously influenced; the gas adsorption layer 303 can adsorb gas generated in the side reaction process, and can effectively avoid the risk of opening the battery and deflagration of combustible gas caused by increase of the internal pressure of the battery. After the battery pack is formed by the battery combination of the embodiment, because the gas adsorption layer 303 is arranged on the inner side of the battery shell, the risk that the pressure inside the battery is increased to cause the opening of the battery and the explosion of the combustible gas can be effectively avoided. In some embodiments, the thermal insulation layer is arranged on the inner side or the outer side of the contact surface of the battery shell of the adjacent battery, so that the thermal insulation effect can be effectively achieved, and the safety of the battery pack can be effectively improved by effectively avoiding the thermal runaway spread of the adjacent battery.

The embodiments of the present application have been described in detail with reference to the drawings, but the present application is not limited to the embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present application. Furthermore, the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

Claims

1. A battery housing, comprising:

and the gas adsorption layer is arranged on the inner wall of the shell and is of a layered structure and used for adsorbing the gas in the inner cavity.

2. The battery case of claim 1, wherein the gas adsorption layer is one of a molecular sieve layer, an activated carbon layer, and a carbon nanotube layer.

3. The battery case according to claim 1, wherein the gas adsorption layer is a porous structure, and the porosity of the gas adsorption layer is 20-70%.

4. The battery case of claim 1, further comprising a thermal insulation layer disposed between the casing and the gas adsorption layer.

5. The battery enclosure of claim 4, wherein the thermal insulation layer is disposed on a portion of an inner wall of the housing; the gas adsorption layer is arranged on one side, away from the inner wall of the shell, of the heat insulation layer, or the gas adsorption layer is arranged on the other part of the inner wall of the shell and on one side, away from the inner wall of the shell, of the heat insulation layer.

6. The battery casing of claim 1, wherein the gas adsorption layer is disposed on a portion of an inner wall of the casing, the battery casing further comprising a thermal insulation layer disposed on another portion of the inner wall of the casing.

7. The battery case of claim 1, further comprising a thermal insulation layer disposed on an outer wall of the housing.

8. The battery casing of claim 1, further comprising two thermal insulation layers, one of the two thermal insulation layers being disposed between the casing and the gas adsorption layer, the other of the two thermal insulation layers being disposed on an outer wall of the casing.

9. The battery casing of claim 1, wherein the gas adsorption layer is disposed on a portion of the inner wall of the casing, the battery casing further comprising two thermal insulation layers, one of the two thermal insulation layers being disposed on another portion of the inner wall of the casing, the other of the two thermal insulation layers being disposed on the outer wall of the casing.

10. The battery is characterized by comprising a winding core, electrolyte and the battery shell as claimed in any one of claims 1 to 9, wherein the winding core and the electrolyte are accommodated in the inner cavity.