Battery monomer, battery and electric equipment

Abstract

The utility model relates to the technical field of batteries, and provides a battery monomer, a battery and electric equipment. The battery cell includes a case, a cover, and an electrode assembly. The shell is provided with a containing space, and the two ends of the shell are open ends. Cover bodies are arranged at the open ends of the two ends of the cover body shell correspondingly, and at least one cover body is provided with a pressure relief part. The electrode assembly is arranged in the accommodating space, a gas guide channel is formed between the electrode assembly and the shell, and the gas guide channel extends from one end of the shell to the other end of the shell; wherein the shell comprises a shell wall, the shell wall comprises a wall body and limiting parts, the wall body and the limiting parts are integrally formed, and an air guide channel is formed between every two adjacent limiting parts. As the gas guide channel extending from one end of the shell to the other end of the shell is arranged, high-temperature and high-pressure gas can be guided to the pressure relief part from one end, far away from the pressure relief part, of the shell when a large amount of gas is generated due to thermal runaway of the single battery, the high-temperature and high-pressure gas at one end, far away from the pressure relief part, in the shell is helped to be discharged from the pressure relief part, and the pressure relief effect is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell, a battery and an electrical device. Background Art

[0002] In the related art, when a battery cell experiences thermal runaway, it is in a fully charged state. When the battery cell is fully charged, the electrode assembly expands, which may fill up the entire battery cell shell. Since a large amount of gas is generated due to thermal runaway, the gas far from the pressure relief part is difficult to diffuse to the pressure relief part at the end of the shell, resulting in insufficient pressure relief, which seriously affects the safety of the battery cell. Utility Model Content

[0003] In view of this, the embodiments of the present application hope to provide a battery cell, a battery and an electrical device, which are conducive to guiding the gas generated at one end away from the pressure relief part to the pressure relief part for discharge when the battery cell has thermal runaway.

[0004] Some embodiments of the present application provide a battery cell, including:

[0005] A shell having a containing space, wherein both ends of the shell are open ends;

[0006] A cover body, wherein the open ends of both ends of the shell are respectively provided with the cover bodies, and at least one of the cover bodies has a pressure relief portion;

[0007] An electrode assembly is disposed in the accommodation space, an air guide channel is formed between the electrode assembly and the shell, and the air guide channel extends from one end of the shell to the other end;

[0008] Wherein, the shell includes a shell wall, and the shell wall includes an integrally formed wall body and a limiting portion, and the air guide channel is formed between two adjacent limiting portions.

[0009] The battery cell provided in the embodiment of the present application has a gas guide channel extending from one end of the shell to the other end. When the battery cell generates a large amount of gas due to thermal runaway, the high-temperature and high-pressure gas can be guided to the pressure relief portion from the end of the shell away from the pressure relief portion, thereby helping the high-temperature and high-pressure gas in the shell away from the pressure relief portion to be discharged from the pressure relief portion, thereby improving the pressure relief effect.

[0010] In some embodiments, the shell includes four shell walls, the four shell walls form a quadrangular prism, the air guide channel is formed in at least one of the four shell walls, and the air guide channel is connected to the accommodating space.

[0011] In this embodiment, the air guiding channel can be formed in one, two, three or four of the four shell walls, and can be adaptively arranged according to air guiding requirements.

[0012] In some embodiments, the limiting portions are provided on both sides of the wall body, and the air guiding channel is formed between the two limiting portions.

[0013] In some embodiments, the shell wall is divided into two oppositely disposed first walls and two oppositely disposed second walls, the width of the first wall is greater than that of the second wall, and the electrode assembly is a winding structure; the air guide channel is formed on the first wall, and the air guide channel located on the first wall is 3 to 5 mm away from the inner walls of the second wall on both sides.

[0014] In this way, the air guide channel has a wider span on the first wall, and can have sufficient space to guide the high-temperature and high-pressure gas to the pressure relief portion.

[0015] In some embodiments, the shell wall is divided into two oppositely disposed first walls and two oppositely disposed second walls, the width of the first wall is greater than that of the second wall, and the electrode assembly is a winding structure; the air guide channel is formed on the second wall, and the air guide channel located on the second wall is 1~2 mm away from the inner walls of the first wall on both sides.

[0016] In this way, the air guide channel has a wider span on the second wall, and can have sufficient space to guide the high-temperature and high-pressure gas to the pressure relief portion.

[0017] In some embodiments, the shell wall is divided into two oppositely disposed first walls and two oppositely disposed second walls, the width of the first wall is greater than that of the second wall, and the electrode assembly is a winding structure; the air guide channel is formed on the first wall, and the air guide channel located on the first wall is 3~5mm away from the inner walls of the second walls on both sides; the air guide channel is formed on the second wall, and the air guide channel located on the second wall is 1~2mm away from the inner walls of the first wall on both sides.

[0018] In this way, the air guide channel has a wider span on both the first wall and the second wall, and can have sufficient space to guide the high-temperature and high-pressure gas to the pressure relief portion.

[0019] In some embodiments, the shell wall is divided into two oppositely disposed first walls and two oppositely disposed second walls, the width of the first wall is greater than that of the second wall, and the electrode assembly is a laminated structure; the air guide channel is formed on the first wall, and the air guide channel located on the first wall is at a distance of 0 to 5 mm from the inner walls of the second wall on both sides.

[0020] In this way, the air guide channel has a wider span on the first wall, and can have sufficient space to guide the high-temperature and high-pressure gas to the pressure relief portion.

[0021] In some embodiments, the shell wall is divided into two oppositely disposed first walls and two oppositely disposed second walls, the width of the first wall is greater than that of the second wall, and the electrode assembly is a laminated structure; the air guide channel is formed on the second wall, and the air guide channel located on the second wall is at a distance of 0 to 2 mm from the inner walls of the first wall on both sides.

[0022] In this way, the air guide channel has a wider span on the second wall, and can have sufficient space to guide the high-temperature and high-pressure gas to the pressure relief portion.

[0023] In some embodiments, the shell wall is divided into two oppositely disposed first walls and two oppositely disposed second walls, the width of the first wall is greater than that of the second wall, and the electrode assembly is a laminated structure; the air guide channel is formed on the first wall, and the air guide channel located on the first wall is at a distance of 0 to 5 mm from the inner walls of the second walls on both sides; the air guide channel is formed on the second wall, and the air guide channel located on the second wall is at a distance of 0 to 2 mm from the inner walls of the first wall on both sides.

[0024] In this way, the air guide channel has a wider span on both the first wall and the second wall, and can have sufficient space to guide the high-temperature and high-pressure gas to the pressure relief portion.

[0025] In some embodiments, the air guiding channel is formed on the limiting portion.

[0026] In this way, the pressure relief effect can be further improved.

[0027] In some embodiments, the limiting portion further has a ventilation groove, and the air guiding channel includes a first air guiding channel formed between the two limiting portions and a second air guiding channel formed in the limiting portion, and the first air guiding channel and the second air guiding channel are connected through the ventilation groove.

[0028] In this way, high-temperature and high-pressure gas can flow between the first gas guiding channel and the second gas guiding channel, further improving the pressure relief effect.

[0029] In some embodiments,

[0030] The limiting portion further has a ventilation groove, and two adjacent air guide channels are connected through the ventilation groove.

[0031] In this way, high-temperature and high-pressure gas flows between two adjacent gas guide channels, further improving the pressure relief effect.

[0032] In some embodiments, the position of the air guide channel at the limiting portion is smoothed.

[0033] In this embodiment, by smoothing the limiting portion, the possibility of stress concentration in the shell can be reduced, and the smooth portion can facilitate guiding the high-temperature and high-pressure gas to the gas guide channel and discharge it from the pressure relief portion.

[0034] The present application also provides a battery, including:

[0035] Box;

[0036] The battery cell described in any one of the above items is arranged in the box.

[0037] The battery provided in the embodiment of the present application has the same beneficial effects as the above-mentioned battery monomer because it includes the above-mentioned battery monomer.

[0038] An embodiment of the present application also provides an electrical device, characterized in that it includes any of the battery cells described above, or the above-mentioned battery, for providing electrical energy.

[0039] Since the electric device provided in the embodiment of the present application includes the above-mentioned battery cell, it has the same beneficial effects as the above-mentioned battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A front view of a battery cell in one embodiment of the present application;

[0041] Figure 2 for Figure 1 A top view of the housing and electrode assembly in the battery cell shown in FIG. 1 (cover hidden);

[0042] Figure 3 In the first embodiment of this application Figure 1 Schematic diagram of the aa section;

[0043] Figure 4 for Figure 3 A magnified schematic diagram of point A;

[0044] Figure 5 for Figure 3 BB cross-sectional diagram (hidden electrode assembly);

[0045] Figure 6 In the second embodiment of this application Figure 1 Schematic diagram of the aa section;

[0046] Figure 7 for Figure 6 An enlarged schematic diagram of point B;

[0047] Figure 8 for Figure 6 Schematic diagram of the cc cross section (hidden electrode components);

[0048] Fig. 9In the third embodiment of this application Figure 1 A schematic cross-sectional view of the aa position;

[0049] Fig.10 for Fig. 9 An enlarged schematic diagram of point C;

[0050] Fig.11 for Fig. 9 An enlarged schematic diagram of point D;

[0051] Fig.12 for Fig. 9 DD cross-sectional diagram;

[0052] Fig.13 In the fourth embodiment of this application Figure 1 Schematic diagram of the aa section;

[0053] Fig.14 for Fig.13 An enlarged schematic diagram of point E;

[0054] Fig.15 for Fig.13 EE cross-sectional diagram of ;

[0055] Fig.16 In the fifth embodiment of the present application Figure 1 Schematic diagram of the aa section;

[0056] Fig.17 for Fig.16 An enlarged schematic diagram of point F;

[0057] Fig.18 for Fig.16 ff cross-sectional diagram;

[0058] Fig.19 In the sixth embodiment of this application Figure 1 Schematic diagram of the aa section;

[0059] Fig. 20 for Fig.19 An enlarged schematic diagram of point G;

[0060] Fig.21 for Fig.19 Schematic diagram of the gg cross section.

[0061] Description of Reference Numerals

[0062] Battery cell 100; shell 10; shell wall 11; first wall 111; second wall 112; wall body 113; limit portion 114; ventilation groove 114a; accommodating space 10a; electrode assembly 20; air guide channel 10b; first air guide channel 11a; second air guide channel 12a; separator 30; cover body 50; pressure relief portion 50a. DETAILED DESCRIPTION

[0063] The following is a further detailed description of the implementation of the present application in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application but cannot be used to limit the scope of the present application.

[0064] In the description of the embodiments of the present application, it should be noted that the orientations or positional relationships indicated by terms such as "upper", "lower", "bottom", "inside", "outside", "first direction", "second direction", and "third direction" are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the embodiments of the present application.

[0065] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which the present application belongs. The terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application. The terms "including" and "having" and any variations thereof of the present application are intended to cover non-exclusive inclusions.

[0066] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0067] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0068] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the term "connection" 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 a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0069] In the description of this specification, the description with reference to the terms "some embodiments", "exemplarily", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine different embodiments or examples described in this application and the features of different embodiments or examples without contradiction.

[0070] In the related art, when a battery cell experiences thermal runaway, it is in a fully charged state. When the battery cell is fully charged, the electrode assembly expands, which may fill up the entire battery cell shell. Since a large amount of gas is generated due to thermal runaway, the gas far from the pressure relief part is difficult to diffuse to the pressure relief part at the end of the shell, resulting in insufficient pressure relief, which seriously affects the safety of the battery cell.

[0071] In view of this, an embodiment of the present application provides a battery cell, which is conducive to guiding the gas generated at one end away from the pressure relief portion to the pressure relief portion for discharge when the battery cell has thermal runaway.

[0072] In a battery, multiple battery cells can be connected in series, in parallel, or in a hybrid connection. A hybrid connection means that multiple battery cells are connected in series and in parallel. Multiple battery cells can be directly connected in series, in parallel, or in a hybrid connection, and then the whole formed by multiple battery cells is placed in a battery box; of course, the battery can also be a battery module formed by connecting multiple battery cells in series, in parallel, or in a hybrid connection, and then multiple battery modules are connected in series, in parallel, or in a hybrid connection to form a whole, and placed in a battery box.

[0073] The battery can be used in electrical devices that use the battery as a power source or use the battery as an energy storage element, such as electric vehicles and energy storage containers.

[0074] The battery may be a secondary battery, which refers to a battery that can be recharged to activate the active material after the battery is discharged and can be used continuously.

[0075] The battery can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery or a lead storage battery, etc.

[0076] The battery cell may be a cylindrical battery cell, a prismatic battery cell or other shapes. The prismatic battery cell may be, for example, a quadrangular prism battery cell, a pentagonal prism battery cell or a hexagonal prism battery cell.

[0077] The present application takes a quadrangular prism square shell battery cell as an example for description, but is not limited thereto. In the drawings of the embodiments of the present application, X represents a first direction, Y represents a second direction, and Z represents a third direction, and the third direction Z may be an up-down direction.

[0078] See also Figure 1-Figure 5 The battery cell 100 includes a housing 10, a cover 50 and an electrode assembly 20. The housing 10 has a receiving space 10a, and both ends of the housing 10 are open ends; the open ends of both ends of the housing 10 are respectively provided with a cover 50, and at least one cover 50 has a pressure relief portion 50a; the electrode assembly 20 is disposed in the receiving space 10a, and an air guide channel 10b is formed between the electrode assembly 20 and the housing 10, and the air guide channel 10b extends from one end of the housing 10 to the other end.

[0079] The housing 10 may be cylindrical, prism or other shapes, and is surrounded to form a receiving space 10a for installing the electrode assembly 20. The housing 10 may be formed by cold drawing, extrusion or welding. For example, the housing 10 includes a housing wall 11, and the housing wall 11 includes an integrally formed wall body 113 and a stopper 114, and an air guide channel 10b is formed between two adjacent stoppers 114.

[0080] The cover 50 is arranged at the open end of the shell 10. When one end of the shell 10 is an open end, the cover 50 has a pressure relief portion 50a. When both ends of the shell 10 are open ends, the cover 50 at one end has a pressure relief portion 50a, and the cover 50 at the other end may not be provided with a pressure relief portion 50a, or may be provided with a pressure relief portion 50a, that is, at least one of the covers 50 at both ends has a pressure relief portion 50a. The cover 50 at both ends of the shell 10 can be manufactured separately from the shell 50, or the cover 50 at one end of the shell 10 can be integrally formed with the shell 50. The pressure relief portion 50a is used to install a pressure relief valve, which can discharge the gas generated by the thermal runaway of the battery cell 100 to the outside of the battery cell 100, so as to play a role in pressure relief and explosion prevention. Exemplarily, the pressure relief portion 50a includes an explosion-proof hole, and the battery cell 100 also includes an explosion-proof valve, which is arranged corresponding to the explosion-proof hole and can be automatically opened under high temperature and high pressure to achieve explosion prevention.

[0081] The electrode assembly 20 is capable of storing and releasing electrical energy. Exemplarily, the electrode assembly 20 includes a main body and a pole ear connected to the main body. Exemplarily, the main body includes a positive electrode sheet and a negative electrode sheet. The main body can be a winding structure, and the positive electrode sheet and the negative electrode sheet are wound into a winding structure. The main body can also be a laminated structure, for example, a plurality of positive electrode sheets and a plurality of negative electrode sheets are alternately stacked. The main body can also be a mixed structure of winding and lamination. Exemplarily, the main body also includes an isolating member, and a plurality of isolating members can be provided, respectively provided between any adjacent positive electrode sheets or negative electrode sheets.

[0082] The air guide channel 10b is formed between the electrode assembly 20 and the shell 10, which means that the air guide channel 10b can be formed on the shell 10, or by providing a separator between the electrode assembly 20 and the shell 10 to separate the electrode assembly 20 from the shell 10 to form the air guide channel 10b. In some embodiments, the electrode assembly 20 is formed by winding the pole piece, and the two sides of the cross section of the electrode assembly 20 are arc-shaped. There is a gap between the arc-shaped electrode assembly 20 and the shell 10 of the square shell battery cell on the outside of the arc of the electrode assembly 20. The air guide channel 10b in the embodiment of the present application is different from such a gap existing due to the structure of the electrode assembly 20.

[0083] The gas guide channel 10b extends from one end of the shell 10 to the other end, and is used to guide the gas to the pressure relief portion 50a of the cover 50 to be discharged to the outside of the battery cell 100. The gas guide channel 10b can extend and penetrate the end of the shell 10 to facilitate the gas to enter between the cover 50 and the electrode assembly and be discharged from the pressure relief portion 50a. The gas guide channel 10b can also only extend to the end of the shell 10 but not penetrate the end, so as to increase the strength of the shell 10. A groove or hole connecting the gas guide channel 10b and the pressure relief portion 50a can be provided on the cover 50 to facilitate the gas to be discharged from the pressure relief portion 50a.

[0084] The shape and number of the air guide channel 10b are not limited. For example, the air guide channel 10b can extend along a straight line or a curve, as long as the general trend is to extend from one end of the shell 10 to the other end. The number of air guide channels 10b can be one or more. The cross-sections of the air guide channels 10b can be consistent or inconsistent. The air guide channel 10b can be connected to the accommodating space 10a, or it can be separated from the accommodating space 10a by an insulating member, and the insulating member can be broken or melted by high-pressure and high-temperature gas when the battery cell 100 thermally runs away.

[0085] Since the embodiment of the present application provides a gas guide channel 10b extending from one end of the shell 10 to the other end, when the battery cell 100 thermally runs away and generates a large amount of gas, the high-temperature and high-pressure gas can be guided to the pressure relief portion 50a from the end of the shell 10 away from the pressure relief portion 50a, thereby helping the high-temperature and high-pressure gas at the end of the shell 10 away from the pressure relief portion 50a to be discharged from the pressure relief portion 50a, thereby improving the pressure relief effect.

[0086] In some embodiments, the air guide channel 10b can be formed on the shell 10, between the electrode assembly 20 and the shell 10. That is, by designing the structure of the shell 10, the air guide channel 10b is formed on the shell 10, and no other structure is required to achieve air conduction. For example, the structure of the air guide channel 10b is a groove formed on the shell 10, located on the side of the shell 10 facing the electrode assembly 20. The shell wall 11 of the shell 10 can be formed into a recessed groove along the thickness direction, that is, a portion of the shell 10 is thinned to form a groove as the air guide channel 10b. Alternatively, the shell 10 can be extended toward the electrode assembly 20 through additive manufacturing technology to form a part of the protrusion to form a limiting portion, and the limiting portion separates the electrode assembly 20 from the part of the shell 10 where the protrusion is not formed, so as to form the air guide channel 10b.

[0087] The position of the air guide channel 10b on the housing 10 can be adaptively set according to the air guide requirements. Figure 3 The housing 10 includes four housing walls 11, and the four housing walls 11 form a quadrangular prism, for example, the four housing walls 11 are opposite to each other to form a square housing, and the air guide channel 10b is formed in at least one of the four housing walls 11, and the air guide channel 10b is connected to the accommodation space 10a. The air guide channel 10b can be formed in one, two, three or four of the four housing walls 11, and each housing wall 11 can have one or more air guide channels 10b.

[0088] Exemplarily, the housing 10 is a square housing, and the housing wall 11 is divided into two oppositely disposed first walls 111 and two oppositely disposed second walls 112, and the width of the first wall 111 is greater than the width of the second wall 112. The first wall 111 is disposed along the first direction X, and the second wall 112 is disposed along the second direction Y. The width of the first wall 111 refers to the extension dimension along the first direction X, and the width of the second wall 112 refers to the extension dimension along the second direction Y.

[0089] Exemplarily, the first wall 111 is arranged along the first direction X, and the second wall 112 is arranged along the second direction Y. The first direction X, the second direction Y and the third direction Z are perpendicular to each other, and the third direction Z can be an up-down direction. Exemplarily, the outer contour of the connection between two adjacent shell walls 11 can be smoothed, for example, to form a rounded corner.

[0090] For some examples, see Figure 3-Figure 5 The air guide channel 10b formed in the shell wall 11 is set as one, which is a continuous channel extending from one end to the other end of the shell 10. The air guide channel 10b can pass through both ends of the shell 10. Figure 5 Schematically, the air guide channel 10b may not penetrate through both ends of the housing 10. The housing 10 is provided with an air guide channel 10b, and the air guide channel 10b can occupy most of the area of ​​the housing wall 11 as much as possible, so that the ventilation area is increased, thereby improving the pressure relief effect.

[0091] In some embodiments, the air guide passages 10b formed in the shell wall 11 are provided in a plurality, and the plurality of air guide passages 10b are continuous passages extending from one end of the shell 10 to the other end. Figure 6-Figure 8 The shell wall 11 includes an integrally formed wall body 113 and a stopper 114, and an air guide channel 10b is formed between two adjacent stoppers 114; the stopper 114 has a venting groove 114a, and two adjacent air guide channels 10b are connected through the venting groove 114a. In this way, high-temperature and high-pressure gas flows between two adjacent air guide channels 10b, thereby improving the pressure relief effect.

[0092] Exemplarily, in order to facilitate the smooth placement of the electrode assembly 20 into the accommodating space 10a of the shell 10, an assembly gap is generally left between the limiting portion 114 and the electrode assembly 20, for example, there is a gap of 1 to 2 mm between the limiting portion 114 and the electrode assembly 20.

[0093] For further information, see Figure 9-12 The position of the air guide channel 10b at the limit portion 114 is smoothed, for example, with a smooth curve or rounded corners. By smoothing the limit portion 114, the possibility of stress concentration in the housing 10 can be reduced, and the smoothing process facilitates the high-temperature and high-pressure gas to be guided to the air guide channel 10b and discharged from the pressure relief portion 50a.

[0094] For further information, see Figure 9-12 The limiting portion 114 is provided with an air guide channel 10b to further improve the pressure relief effect. For example, the limiting portion 114 may be located at a corner formed by connecting the two shell walls 11 .

[0095] For example, see Figure 9-12 , the air guide channel 10b formed in the shell wall 11 is set as one, which is a continuous channel extending from one end of the shell 10 to the other end. For example, the shell 10 can be manufactured in one piece. That is to say, the shell wall 11 can be split into a wall body 113 and a limiting portion 114 that are integrally formed, and the limiting portions 114 are provided on both sides of the wall body 113, and the air guide channel 10b is formed between the two limiting portions 114. In other words, the limiting portion 114 at the connection between two adjacent shell walls 11 can also be integrally formed. The two limiting portions 114 can improve the limiting effect on the battery cell 100.

[0096] For example, see Figure 9-12 The shell wall 11 is a first wall 111, and the wall body 113 has a limiting portion 114 on both sides along the first direction X. In other embodiments, please refer to Figure 13-Figure 15The shell wall 11 is a second wall 112, and the wall body 113 has limiting portions 114 on both sides along the second direction Y. In this way, most of the area of ​​the shell wall 11 can be fully utilized as the air guide channel 10b, increasing the air guide volume and improving the pressure relief effect.

[0097] For example, see Figure 11-Figure 12 The limiting portion 114 also has a venting groove 114a, and the air guide channel 10b includes a first air guide channel 11a formed between the two limiting portions 114 and a second air guide channel 12a formed in the limiting portion 114, and the first air guide channel 11a and the second air guide channel 12a are connected through the venting groove. In this way, high-temperature and high-pressure gas can flow between the first air guide channel 11a and the second air guide channel 12a, further improving the pressure relief effect.

[0098] Exemplarily, both sides of the wall 113 are provided with a limiting portion 114, and an air guide channel 10b is formed between the two limiting portions 114. Figure 4 and Fig.10 The electrode assembly 20 is a laminated structure, and the air guide channel 10b is formed on the first wall 111. The distance S1 between the air guide channel 10b located on the first wall 111 and the inner wall of the second wall 112 on both sides is 0-5 mm (millimetre). For example, it can be 0 mm, 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm or 5 mm. In this way, the air guide channel 10b has a wide span on the first wall 111, and there is sufficient space to guide the high-temperature and high-pressure gas to the pressure relief portion 50a.

[0099] For some examples, see Fig.14 , the electrode assembly 20 is a laminated structure, the gas guide channel 10b is formed on the second wall 112, and the distance S2 between the gas guide channel 10b located on the second wall 112 and the inner wall of the first wall 111 on both sides is 0-2 mm. For example, it can be 0 mm, 0.2 mm, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 1.8 mm or 2 mm. In this way, the gas guide channel 10b has a wide span on the second wall 112, and there is sufficient space to guide the high-temperature and high-pressure gas to the pressure relief portion 50a.

[0100] In other embodiments not shown, the electrode assembly 20 is a winding structure, and the air guide channel 10b is formed on the first wall 111. The distance S1 between the air guide channel 10b located on the first wall 111 and the inner wall of the second wall 112 on both sides is 3 to 5 mm (millimetre). For example, it can be 3 mm, 3.5 mm, 4 mm, 4.5 mm or 5 mm. In this way, the air guide channel 10b has a wider span on the first wall 111, and there is sufficient space to guide the high-temperature and high-pressure gas to the pressure relief portion 50a.

[0101] In other embodiments not shown, the electrode assembly 20 is a winding structure, and the gas guide channel 10b is formed on the second wall 112. The distance S2 between the gas guide channel 10b located on the second wall 112 and the inner wall of the first wall 111 on both sides is 1-2 mm. For example, it can be 1 mm, 1.2 mm, 1.5 mm, 1.8 mm or 2 mm. In this way, the gas guide channel 10b has a wider span on the second wall 112, and there is sufficient space to guide the high-temperature and high-pressure gas to the pressure relief portion 50a.

[0102] It should be noted that when the air guiding channel 10b is formed on the first wall 111, the measuring method of the distance S1 between the air guiding channel 10b and the inner walls of the second walls 112 on both sides, and when the air guiding channel 10b is formed on the second wall 112, the measuring method of the distance S2 between the air guiding channel 10b and the inner walls of the first walls 111 on both sides are not limited, for example, they can be measured by a vernier caliper.

[0103] Exemplarily, when the air guide channel 10b is formed on the first wall 111, the distance S1 between the air guide channel 10b and the inner wall of the second wall 112 on both sides is measured by a vernier caliper. Specifically, in an environment with a room temperature of 25°C, the main scale of the vernier caliper is brought into contact with the inner wall surface of the second wall 112, and the vernier is moved so that the vernier is brought into contact with the other side surface of the stopper 114 away from the inner wall of the second wall 112, and the value of the vernier caliper is read to obtain the size of the inner wall distance S1.

[0104] In some other embodiments, the air guide channel 10b may not be formed on the housing 10, but the housing 10 and the electrode assembly 20 may be separated by a separator 30 to form the air guide channel 10b between the housing 10 and the electrode assembly 20. For example, see Figure 16-Figure 18 The battery cell 100 includes a separator 30 located between the housing 10 and the electrode assembly 20 to form an air guide channel 10b. The separator 30 and the housing 10 are manufactured separately.

[0105] The separator 30 can support and fix the electrode assembly 20 to reduce the possibility of the electrode assembly 20 shaking in the housing 10. Exemplarily, the separator 30 is fixedly connected to the housing 10 to improve the effect of supporting and fixing the electrode assembly 20. In other embodiments, the separator 30 is installed between the housing 10 and the electrode assembly 20, and is not fixedly connected to the housing 10.

[0106] Exemplarily, in order to facilitate the smooth placement of the electrode assembly 20 into the accommodating space 10 a of the shell 10 , an assembly gap is generally left between the separator 30 and the electrode assembly 20 , for example, a gap of 1 to 2 mm is left between the separator 30 and the electrode assembly 20 .

[0107] The number of separators 30 may be set to one. Exemplarily, one separator 30 is disposed between any shell wall 11 and the electrode assembly 20. For example, the separator 30 may be disposed between a first wall 111 and the electrode assembly 20, or between a second wall 112 and the electrode assembly 20.

[0108] The number of the partitions 30 may be multiple. For example, the partitions 30 are arranged at intervals in the up-down direction; and / or the partitions 30 are arranged at intervals in the first direction X; and / or the partitions 30 are arranged at intervals in the second direction Y.

[0109] It is understandable that the separator 30 may be provided between only one shell wall 11 and the electrode assembly 20, or between multiple shell walls 11 and the electrode assembly 20. For example, the separator 30 may be provided between only one first wall 111 and the electrode assembly 20, or between two first walls 111. Alternatively, the separator 30 may be provided between only one second wall 112 and the electrode assembly 20, or between two second walls 112.

[0110] For some examples, see Figure 19-21The battery cell 100 includes a shell 10, a cover 50 and an electrode assembly 20. Among them, the electrode assembly 20 is a winding structure. At least one end of the shell 10 is an open end; the cover 50 has a pressure relief portion 50a, and the cover 50 is arranged at the open end of the shell 10; the electrode assembly 20 is arranged in the accommodating space 10a. The shell 10 includes four shell walls 11, and the four shell walls 11 are arranged opposite to each other in pairs to form a quadrangular prism. The shell walls 11 are divided into two oppositely arranged first walls 111 and two oppositely arranged second walls 112, and the width of the first wall 111 is greater than that of the second wall 112. The air guide channel 10b is formed on the first wall 111 and the second wall 112. The air guide channel 10b located on the first wall 111 is at a distance S1 of 3.5 mm from the inner wall of the second wall 112 on both sides, and the air guide channel 10b located on the second wall 112 is at a distance S2 of 2 mm from the inner wall of the first wall 111 on both sides. The shell wall 11 includes an integrally formed wall body 113 and a limiting portion 114. The limiting portions 114 are arranged on both sides of the wall body 113. An air guide channel 10b is formed between the two limiting portions 114. The position of the air guide channel 10b located at the limiting portion 114 is smoothed. The limiting portion 114 is located at the corner formed by the connection of the two shell walls 11. An air guide channel 10b is formed on each limiting portion 114. The air guide channel 10b includes a first air guide channel 11a formed between the two limiting portions 114 and a second air guide channel 12a formed on the limiting portion 114. The first air guide channel 11a and the second air guide channel 12a are both directly connected to the accommodating space 10a.

[0111] In this embodiment, since an air guide channel 10b extending from one end of the shell 10 to the other end is provided, when a large amount of gas is generated due to thermal runaway of the battery cell 100, the high-temperature and high-pressure gas can be guided to the pressure relief portion 50a from the end of the shell 10 away from the pressure relief portion 50a, helping the high-temperature and high-pressure gas in the shell 10 away from the pressure relief portion 50a to be discharged from the pressure relief portion 50a, thereby improving the pressure relief effect. By smoothing the limiting portion 114, the possibility of stress concentration in the shell 10 can be reduced, and the smooth portion can facilitate the guidance of the high-temperature and high-pressure gas to the air guide channel 10b and discharge from the pressure relief portion 50a. By providing two limiting portions 114, the limiting effect on the battery cell 100 can be improved. The air guide channel 10b has a wide span on the first wall 111, and can have sufficient space to guide the high-temperature and high-pressure gas to the pressure relief portion 50a. The air guiding channels 10 b are both provided on the first wall 111 and the second wall 112 , and the air guiding channels 10 b are both provided at the corners formed by connecting the two shell walls 11 , which can improve the pressure relief effect.

[0112] The present application also provides a battery, including a box and a battery cell 100 provided in any embodiment of the present application, wherein the battery cell 100 is disposed in the box. For example, a plurality of battery cells 100 are arranged in the box, and the battery cells 100 are connected in series, in parallel or in a mixed connection.

[0113] An embodiment of the present application further provides an electrical device, comprising the battery cell 100 provided in any embodiment of the present application, and the electrical device is used to provide electrical energy.

[0114] An embodiment of the present application also provides an electrical device, including a battery provided by any embodiment of the present application, and the electrical device is used to provide electrical energy.

[0115] Electrical devices include, but are not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, etc. Electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc.

[0116] The various embodiments / implementations provided in this application can be combined with each other without causing any contradiction.

[0117] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: A shell having a containing space, wherein both ends of the shell are open ends; A cover body, wherein the open ends of both ends of the shell are respectively provided with the cover bodies, and at least one of the cover bodies has a pressure relief portion; An electrode assembly is disposed in the accommodation space, an air guide channel is formed between the electrode assembly and the shell, and the air guide channel extends from one end of the shell to the other end; Wherein, the shell includes a shell wall, and the shell wall includes an integrally formed wall body and a limiting portion, and the air guide channel is formed between two adjacent limiting portions.

2. The battery cell according to claim 1, characterized in that: The shell includes four shell walls, the four shell walls form a quadrangular prism, the air guide channel is formed in at least one of the four shell walls, and the air guide channel is communicated with the accommodating space.

3. The battery cell according to claim 2, characterized in that: The limiting parts are arranged on both sides of the wall body, and the air guide channel is formed between the two limiting parts.

4. The battery cell according to claim 3, characterized in that: The shell wall is divided into two first walls arranged opposite to each other and two second walls arranged opposite to each other, the width of the first wall is greater than that of the second wall, and the electrode assembly is a winding structure; The air guiding channel is formed on the first wall, and the distance between the air guiding channel and the inner walls of the second walls on both sides is 3~5mm; and / or, the air guiding channel is formed on the second wall, and the distance between the air guiding channel and the inner walls of the first walls on both sides is 1~2mm.

5. The battery cell according to claim 3, characterized in that: The shell wall is divided into two first walls arranged opposite to each other and two second walls arranged opposite to each other, the width of the first wall is greater than that of the second wall, and the electrode assembly is a laminated structure; The air guiding channel is formed on the first wall, and the distance between the air guiding channel located on the first wall and the inner walls of the second walls on both sides is 0~5mm; and / or, the air guiding channel is formed on the second wall, and the distance between the air guiding channel located on the second wall and the inner walls of the first wall on both sides is 0~2mm.

6. The battery cell according to claim 3, characterized in that: The air guiding channel is formed on the limiting portion.

7. The battery cell according to claim 6, characterized in that: The limiting portion further has a ventilation groove, and the air guiding channel includes a first air guiding channel formed between the two limiting portions and a second air guiding channel formed in the limiting portion, and the first air guiding channel and the second air guiding channel are connected through the ventilation groove.

8. The battery cell according to claim 2, characterized in that: The limiting portion further has a ventilation groove, and two adjacent air guide channels are connected through the ventilation groove.

9. The battery cell according to any one of claims 3 to 8, characterized in that: The position of the air guide channel at the limiting portion is smoothed.

10. A battery, characterized in that: include: Box; The battery cell according to any one of claims 1 to 9 is arranged in the box.

11. An electrical device, characterized in that: A battery cell comprising any one of claims 1 to 9, or a battery according to claim 10, for providing electrical energy.

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