Battery

Abstract

The utility model relates to the technical field of batteries, and discloses a battery. The battery comprises a battery shell, the battery shell comprises a metal shell and an insulating shell, the surface of the metal shell is covered with the insulating shell, the metal shell and the insulating shell are of an integrally-formed structure, a pressure relief structure is arranged on the battery shell, the pressure relief structure comprises a pressure relief part and a through hole formed in the metal shell, and the through hole is formed in the metal shell. And the pressure relief part is a part, opposite to the through hole, of the insulating shell. After thermal runaway of the battery cell occurs, high-temperature gas, sparks and high-temperature solid particles can only break through the pressure relief part through high pressure to be sprayed out, and the high-temperature gas, the sparks and the high-temperature solid particles can only melt the pressure relief part through high temperature to be sprayed out, so that the high-temperature gas, the sparks and the high-temperature solid particles can be quickly sprayed out; and battery explosion is avoided.

Description

Technical Field

[0001] The present disclosure relates to the technical field of batteries, and in particular to a battery. Background Art

[0002] At present, the battery shell may include a metal shell and an insulating shell, and the metal shell and the insulating shell are an integrally formed structure. The insulating shell can reduce the risk of electrochemical corrosion of the battery shell; however, it is difficult to form a pressure relief structure on the battery shell.

[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content

[0004] The purpose of the present disclosure is to overcome the deficiencies of the above-mentioned related technologies and provide a battery.

[0005] According to one aspect of the present disclosure, there is provided a battery, comprising:

[0006] The battery shell includes a metal shell and an insulating shell. The insulating shell covers the surface of the metal shell. The metal shell and the insulating shell are an integrally formed structure. A pressure relief structure is provided on the battery shell. The pressure relief structure includes a pressure relief portion and a through hole provided in the metal shell. The pressure relief portion is a portion of the insulating shell that is arranged opposite to the through hole.

[0007] The battery disclosed in the present invention may include a pressure relief part and a through hole provided in a metal shell, wherein the pressure relief part is a portion of the insulating shell arranged opposite to the through hole; after thermal runaway of the battery cell occurs, high-temperature gas, sparks and high-temperature solid particles may only break through the pressure relief part through high pressure and be ejected, and high-temperature gas, sparks and high-temperature solid particles may only melt the pressure relief part through high temperature and be ejected, thereby allowing the high-temperature gas, sparks and high-temperature solid particles to be ejected quickly to avoid battery explosion; and, the integral molding of the metal shell and the insulating shell is not affected.

[0008] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0010] Figure 1 It is a schematic diagram of the three-dimensional structure of an exemplary embodiment of the battery disclosed in the present invention.

[0011] Figure 2 Schematic cross-sectional view of a first exemplary embodiment of a battery disclosed herein.

[0012] Figure 3 It is a cross-sectional schematic diagram of a second exemplary embodiment of the battery disclosed herein.

[0013] Figure 4 Schematic cross-sectional view of a third exemplary embodiment of a battery disclosed herein.

[0014] Description of reference numerals:

[0015] 1. Battery housing; 11. Metal housing; 12. Insulating housing; 12a. Inner insulating housing; 12b. Outer insulating housing; 13. Pressure relief structure; 131. Pressure relief portion; 132. Through hole; 133. Protruding portion; 14. Side plate; 15. Bottom wall plate; 16. Edge; 17. Corner portion;

[0016] 2. battery cell; 21. main body; 22. first pole ear; 23. second pole ear;

[0017] 3. Cover plate; 4. First pole; 5. Second pole. DETAILED DESCRIPTION

[0018] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present disclosure will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted. In addition, the drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale.

[0019] Although relative terms such as "upper" and "lower" are used in this specification to describe the relative relationship of one component of the illustration to another component, these terms are used in this specification only for convenience, such as according to the orientation of the examples described in the drawings. It is understood that if the device of the illustration is turned upside down, the component described as "upper" will become the component "lower". When a structure is "on" other structures, it may mean that the structure is formed integrally on the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure through another structure.

[0020] The terms "a", "an", "the", "said" and "at least one" are used to indicate the presence of one or more elements / components / etc.; the terms "including" and "having" are used to express an open-ended inclusive meaning and mean that additional elements / components / etc. may exist in addition to the listed elements / components / etc.; the terms "first", "second" and "third" etc. are used merely as labels and are not intended to limit the quantity of their objects.

[0021] In this application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. "And / or" is just a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: 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 previous and next associated objects are in an "or" relationship.

[0022] The exemplary embodiment of the present disclosure provides a battery, referring to Figure 1-Figure 4 As shown, Figure 1 In the figure, since the pressure relief structure 13 is blocked, it is indicated by a dotted line. The battery may include a battery shell 1, and the battery shell 1 may include a metal shell 11 and an insulating shell 12. The insulating shell 12 covers the surface of the metal shell 11. The metal shell 11 and the insulating shell 12 are an integrally formed structure. The battery shell 1 is provided with a pressure relief structure 13, and the pressure relief structure 13 includes a pressure relief portion 131 and a through hole 132 provided on the metal shell 11. The pressure relief portion 131 is a portion of the insulating shell 12 that is arranged opposite to the through hole 132.

[0023] In the battery disclosed herein, after thermal runaway occurs in the battery cell 2, high-temperature gas, sparks and high-temperature solid particles can be ejected by breaking through the pressure relief portion 131 by high pressure, and high-temperature gas, sparks and high-temperature solid particles can be ejected by melting the pressure relief portion 131 by high temperature, thereby allowing the high-temperature gas, sparks and high-temperature solid particles to be ejected quickly to avoid battery explosion; and, the integral molding of the metal shell 11 and the insulating shell 12 is not affected.

[0024] In this example embodiment, the battery may be a quadrangular prism battery. Figure 1As shown, the battery housing 1 of the quadrangular prism battery can be set to a rectangular parallelepiped structure. Specifically, the battery housing 1 may include five wall panels, which are a bottom wall panel 15 and four side panels 14. The four side panels 14 are arranged opposite to each other in pairs; the four side panels 14 are connected end to end in sequence to form a rectangular cylindrical shape. A bottom wall panel 15 is connected to one side of the four side panels 14, so that the bottom wall panel 15 and the four side panels 14 are surrounded to form a accommodating cavity. A cover plate 3 is connected to the other side of the four side panels 14, and the opening of the battery housing 1 is sealed by the cover plate 3.

[0025] Of course, in some other example embodiments of the present disclosure, the bottom wall plate 15 and the cover plate 3 can be set to be circular, elliptical, other polygonal, etc., and the side plate 14 can be set to one or more, and surround to form a cylinder, an elliptical cylinder, other polygonal cylinder, etc., so that the battery housing 1 is formed into a cylindrical shape, an elliptical cylinder shape, other polygonal cylinder shape, etc., so that the battery is a cylindrical battery, an elliptical cylindrical battery, other polygonal prismatic battery, etc.

[0026] Reference Figure 2-Figure 4 As shown, the battery housing 1 may include a metal housing 11 and an insulating housing 12, wherein the insulating housing 12 covers the surface of the metal housing 11, so that the bottom wall plate 15 and the four side plates 14 of the battery housing 1 are all at least two-layer stacked structures including a metal layer and at least one insulating layer.

[0027] It should be noted that the surface of the metal shell 11 may be not only the outer surface of the metal shell 11 , but also the inner surface of the metal shell 11 , or both the outer surface and the inner surface of the metal shell 11 .

[0028] The metal shell 11 and the insulating shell 12 are an integrally formed structure, that is, the metal shell 11 and the insulating shell 12 are formed by an integrally formed process. For example, an insulating layer can be formed on a metal plate by bonding, coating, hot melting and other processes, and then the metal plate formed with the insulating layer is subjected to a stamping process or a stretching process, so that the metal plate formed with the insulating layer forms a battery shell 1 with a accommodating cavity, that is, the metal plate forms the metal shell 11, and the insulating layer forms the insulating shell 12. The integrally formed structure does not first form a metal shell 11 with a accommodating cavity by a stamping process or a stretching process on the metal plate, and then form an insulating shell 12 on the metal shell 11 by bonding, coating, hot melting and other processes. The integrally formed structure makes the connection between the metal shell 11 and the insulating shell 12 tighter, and there is almost no gap between the metal shell 11 and the insulating shell 12. Moreover, the preparation process is relatively simple, which is conducive to improving efficiency.

[0029] The metal shell 11 may be an aluminum shell or an aluminum alloy shell, that is, the material of the metal shell 11 may be aluminum or an aluminum alloy, etc. Of course, it may also be other materials, which will not be described here one by one.

[0030] In this example implementation, refer to Figure 2-Figure 4 As shown, a battery cell 2 is arranged in the accommodating cavity of the battery housing 1. The battery cell 2 is arranged as a rectangular parallelepiped adapted to the battery housing 1. The battery cell 2 is the smallest unit for charging and discharging the battery.

[0031] The battery cell 2 may include a main body 21, a first pole tab 22, and a second pole tab 23. The main body 21 may include a first pole piece, a separator, and a second pole piece (not shown in the figure) arranged in a stacked manner, that is, the battery cell 2 may include a plurality of first pole pieces and second pole pieces arranged in a stacked manner, and a separator arranged between the first pole piece and the second pole piece, and the battery cell 2 is a stacked type. The battery cell 2 may also be a wound type, and the stacked structure formed by the first pole piece, the separator, and the second pole piece is wound to form a wound type battery cell 2. Different active materials are coated on the first pole piece and the second pole piece.

[0032] The polarity of the first electrode is opposite to that of the second electrode. For example, the first electrode may be a positive electrode and the second electrode may be a negative electrode. Of course, the first electrode may be a negative electrode and the second electrode may be a positive electrode.

[0033] The first electrode tab 22 and the second electrode tab 23 may be led out from the same side of the main body 21 . For example, the first electrode tab 22 and the second electrode tab 23 may be led out from a first end surface of the main body 21 .

[0034] Specifically, the first pole ear 22 is connected to the first pole piece, and the first pole ear 22 is located on the side of the first end face away from the main body 21; a part of the first pole piece may extend out of the main body 21 and be bent to the side of the first end face away from the main body 21 to form the first pole ear 22.

[0035] The second pole ear 23 is connected to the second pole piece and is located on the side of the first end surface away from the main body 21 . The second pole ear 23 may be formed by a portion of the second pole piece extending out of the main body 21 and being bent to the side of the first end surface away from the main body 21 .

[0036] It should be noted that the first pole tab 22 and the second pole tab 23 are conductive foil areas without active material coating, that is, no active material coating is coated on the first pole tab 22 and the second pole tab 23, and they are current collecting layers for transmitting current.

[0037] The first pole tab 22 can be connected to the first pole 4 so that the first pole 4 can form the positive pole of the battery; the second pole tab 23 can be connected to the second pole 5 so that the second pole 5 can form the negative pole of the battery.

[0038] A pressure relief structure 13 needs to be provided on the battery housing 1. After the battery cell 2 has thermal runaway, high-temperature gas, sparks and high-temperature solid particles can break through the pressure relief structure 13 on the battery housing 1 and spray out from the pressure relief structure 13 to prevent the battery from exploding.

[0039] The pressure relief structure 13 is generally a weak structure arranged on the battery shell 1, and the weak structure may be a scratch, a groove, etc. arranged on the battery shell 1; since the metal shell 11 and the insulating shell 12 are an integrally formed structure, each part of the battery shell 1 is a stacked structure of at least two layers including a metal layer and at least one insulating layer, making it difficult to form a pressure relief structure 13 in the battery shell 1 that can be quickly broken through by high-temperature gases, sparks, and high-temperature solid particles.

[0040] In this example implementation, refer to Figure 2 As shown, the pressure relief structure 13 may include a pressure relief portion 131 and a through hole 132 provided on the metal shell 11. The pressure relief portion 131 is a portion of the insulating shell 12 that is arranged opposite to the through hole 132. That is, the through hole 132 is provided on the metal shell 11, and the portion of the insulating shell 12 that is arranged opposite to the through hole 132 is the pressure relief portion 131. The through hole 132 and the pressure relief portion 131 together form the pressure relief structure 13.

[0041] After the battery cell 2 undergoes thermal runaway, high-temperature gas, sparks and high-temperature solid particles can only break through the pressure relief part 131 through high pressure and spray out, thereby avoiding the battery explosion; moreover, high-temperature gas, sparks and high-temperature solid particles can only melt the pressure relief part 131 through high temperature and spray out, thereby avoiding the battery explosion.

[0042] Furthermore, the pressure relief structure 13 is provided in this way without affecting the integral forming of the metal shell 11 and the insulating shell 12 .

[0043] In this example embodiment, the wall thickness H1 of the insulating shell 12 is greater than or equal to 20μm and less than or equal to 200μm. For example, the wall thickness H1 of the insulating shell 12 can be 25μm, 30μm, 35μm, 40μm, 45μm, 50μm, 55μm, 60μm, 65μm, 70μm, 75μm, 80μm, 85μm, 90μm, 95μm, 100μm, 105μm, 110μm, 115μm, 120μm, 125μm, 130μm, 135μm, 140μm, 145μm, 150μm, 155μm, 160μm, 165μm, 170μm, 175μm, 180μm, 185μm, 190μm, 195μm, etc.

[0044] If the wall thickness H1 of the insulating shell 12 is too thin, the insulating shell 12 cannot play the role of insulation isolation; and the insulating shell 12 is not strong enough and is easily damaged during use.

[0045] If the wall thickness H1 of the insulating shell 12 is too thick, the pressure relief portion 131 of the insulating shell 12 cannot be quickly opened, and high-temperature gas, sparks and high-temperature solid particles cannot be discharged in time, causing the battery to explode; and it is not conducive to improving the energy density of the battery.

[0046] The above numerical range not only ensures that the insulating shell 12 can play the role of insulation isolation and has sufficient strength and is not easy to be damaged; but also the high-temperature gas, sparks and high-temperature solid particles can quickly break open the pressure relief part 131 and spray out, avoiding the battery from exploding, and is also beneficial to improving the energy density of the battery.

[0047] In this example embodiment, the melting point of the insulating shell 12 is greater than or equal to 150°C and less than or equal to 300°C. For example, the melting point of the insulating shell 12 may be 155°C, 160°C, 165°C, 170°C, 175°C, 180°C, 185°C, 190°C, 195°C, 200°C, 205°C, 210°C, 215°C, 220°C, 225°C, 230°C, 235°C, 240°C, 245°C, 250°C, 255°C, 260°C, 265°C, 270°C, 275°C, 280°C, 285°C, 290°C, 295°C, and the like.

[0048] The material of the insulating shell 12 may be a polymer or a resin. For example, the material of the insulating shell 12 may be polyethylene, polytetrafluoroethylene, polypropylene, polyimide, polyethylene terephthalate, polycarbonate, and the like.

[0049] Some particles of metal material with a higher melting point may be doped into the polymer or resin to increase the melting point of the insulating shell 12 . For example, the doped metal particles may be aluminum, copper, steel, nickel, tin, etc.

[0050] If the melting point of the insulating shell 12 is too high, it will be difficult for the high-temperature gas, sparks and high-temperature solid particles to melt the pressure relief part 131 and spray out. They can only be sprayed out by breaking the pressure relief part 131 through high pressure, which affects the spraying speed of the high-temperature gas, sparks and high-temperature solid particles.

[0051] If the melting point of the insulating shell 12 is too low, the pressure relief portion 131 is easily melted before the battery core 2 is overheated, causing the pressure relief portion 131 to explode prematurely, thus affecting the service life of the battery.

[0052] The above-mentioned numerical range not only allows the high-temperature gas, sparks and high-temperature solid particles to melt the pressure relief portion 131, but also allows the high-pressure to break through the pressure relief portion 131 and spray out, thereby ensuring that the high-temperature gas, sparks and high-temperature solid particles can be sprayed out quickly; and the pressure relief portion 131 will not explode prematurely, thereby ensuring the service life of the battery.

[0053] In this example implementation, refer to Figure 2 As shown, the insulating shell 12 may include an inner insulating shell 12a, that is, the insulating shell 12 is arranged on the inner surface of the metal shell 11, that is, the inner insulating shell 12a is arranged closer to the battery cell 2 relative to the metal shell 11. The inner insulating shell 12a can increase the ability of the battery shell 1 to resist electrolyte corrosion, and increase the insulation effect between the battery shell 1 and the battery cell 2.

[0054] In addition, in some other exemplary embodiments of the present disclosure, referring to Figure 3 As shown, the insulating shell 12 may include an outer insulating shell 12b, that is, the insulating shell 12 is arranged on the outer surface of the metal shell 11, that is, the outer insulating shell 12b is arranged farther away from the battery cell 2 relative to the metal shell 11. The outer insulating shell 12b can increase the insulation effect between the battery shell 1 and other external components.

[0055] Of course, in some further exemplary embodiments of the present disclosure, reference Figure 4 As shown, the insulating shell 12 may include an inner insulating shell 12a and an outer insulating shell 12b, wherein the inner insulating shell 12a is disposed on the inner surface of the metal shell 11, that is, the inner insulating shell 12a is disposed closer to the battery cell 2 than the metal shell 11. The inner insulating shell 12a can increase the ability of the battery shell 1 to resist electrolyte corrosion, and increase the insulation effect between the battery shell 1 and the battery cell 2.

[0056] The outer insulating shell 12b is arranged on the outer surface of the metal shell 11, that is, the outer insulating shell 12b is arranged farther away from the battery core 2 than the metal shell 11. The outer insulating shell 12b can increase the insulation effect between the battery shell 1 and other external components.

[0057] In this case, the pressure relief structure 13 may include two pressure relief parts 131 and a through hole 132 arranged on the metal shell 11, one of the pressure relief parts 131 is the part of the inner insulating shell 12a opposite to the through hole 132, and the other pressure relief part 131 is the part of the outer insulating shell 12b opposite to the through hole 132.

[0058] Moreover, the thickness H1a of the inner insulating shell 12a is greater than the thickness H1b of the outer insulating shell 12b. Since an electrolyte is provided in the battery shell 1, the thickness H1a of the inner insulating shell 12a is set to be thicker, which can ensure the ability of the inner insulating shell 12a to resist electrolyte corrosion and avoid the electrolyte corroding the inner insulating shell 12a, which may cause the internal conduction of the battery and self-discharge.

[0059] Reference Figure 3 and Figure 4As shown, a part of the insulating shell 12 is located in the through hole 132 to form a protrusion 133, that is, the protrusion 133 and the insulating shell 12 are connected as a whole, and the protrusion 133 is a part of the pressure relief structure 13; the protrusion 133 can increase the strength of the insulating shell 12 at the through hole 132, avoid cracking of the insulating shell 12 at the through hole 132, and then increase the strength of the battery shell 1 at the through hole 132. Before the battery shell 1 is formed by a stamping process or a stretching process, when the insulating layer is formed by a coating, hot melting or other process, since the material forming the insulating layer has a certain fluidity, the material forming the insulating layer will flow into the through hole 132 of the metal shell 11, and after cooling, the insulating layer and the protrusion 133 are formed, so that the insulating layer and the protrusion 133 are also an integrally formed structure.

[0060] Reference Figure 3 As shown, in the case where the insulating shell 12 only includes the inner insulating shell 12 a or the outer insulating shell 12 b , the height of the protrusion 133 may be less than or equal to the wall thickness of the metal shell 11 .

[0061] Reference Figure 4 As shown, in the present example embodiment, when the insulating shell 12 includes an inner insulating shell 12a and an outer insulating shell 12b, since a portion of the inner insulating shell 12a is located in the through hole 132 to form a protrusion 133, a portion of the outer insulating shell 12b is also located in the through hole 132 to form a protrusion 133, so that the protrusion 133 basically fills the through hole 132, and the height of the protrusion 133 can be equal to the wall thickness of the metal shell 11.

[0062] In this case, the pressure relief structure 13 may include two protrusions 133, two pressure relief portions 131 and a through hole 132 arranged on the metal shell 11, wherein one of the pressure relief portions 131 is a portion of the inner insulating shell 12a that is opposite to the through hole 132, and the other pressure relief portion 131 is a portion of the outer insulating shell 12b that is opposite to the through hole 132; one of the protrusions 133 is a structure in which the inner insulating shell 12a is formed in the through hole 132, and the other protrusion 133 is a structure in which the outer insulating shell 12b is formed in the through hole 132.

[0063] Of course, in some other exemplary embodiments of the present disclosure, even when the insulating shell 12 includes an inner insulating shell 12a and an outer insulating shell 12b, only a portion of the inner insulating shell 12a may be located in the through hole 132 to form the protrusion 133, while a portion of the outer insulating shell 12b is not located in the through hole 132, and no protrusion 133 is formed; or only a portion of the outer insulating shell 12b may be located in the through hole 132 to form the protrusion 133, while a portion of the inner insulating shell 12a is not located in the through hole 132, and no protrusion 133 is formed. In this case, the height of the protrusion 133 may be less than or equal to the wall thickness of the metal shell 11, and the pressure relief structure 13 may include a protrusion 133, two pressure relief portions 131, and a through hole 132 provided in the metal shell 11.

[0064] In this exemplary embodiment, the area of ​​the through hole 132 is greater than or equal to 2 mm. 2 And less than or equal to 50mm 2 For example, the area of ​​the through hole 132 may be 5 mm 2 , 7mm 2 , 10mm 2 、13mm 2 , 15mm 2 、18mm 2 , 20mm 2 , 22mm 2 , 25mm 2 、28mm 2 , 30mm 2 、32mm 2 , 35mm 2 、37mm 2 , 40mm 2 、43mm 2 , 45mm 2 、48mm 2 etc.

[0065] If the area of ​​the through hole 132 is too large, the strength of the metal shell 11 will be greatly reduced, and there will only be the pressure relief portion 131 at the through hole 132 , which is prone to breakage.

[0066] If the area of ​​the through hole 132 is too small, even if the high-temperature gas, sparks and high-temperature solid particles melt or break through the pressure relief portion 131, it will be difficult for them to be ejected quickly, thus affecting the ejection speed of the high-temperature gas, sparks and high-temperature solid particles.

[0067] The above numerical range not only ensures the strength of the battery housing 1 so that the pressure relief portion 131 is not easily broken, but also enables high-temperature gas, sparks and high-temperature solid particles to melt, break and quickly eject the pressure relief portion 131.

[0068] In this example implementation, refer to Figure 1-Figure 4 As shown, the through hole 132 can be provided at the edge 16 where the two sides of the metal shell 11 are connected, for example, referring to Figure 1 As shown, the through hole 132 can be provided at the edge 16 where two adjacent side panels 14 are connected, referring to Figure 2-Figure 4 As shown, the through hole 132 can also be provided at the edge 16 where the side plate 14 and the bottom wall plate 15 are connected. The edge 16 where the two sides of the metal shell 11 are connected is formed by stamping or stretching, resulting in a relatively concentrated stress at the edge 16. The through hole 132 is provided at the edge 16 where the two sides of the metal shell 11 are connected, which can reduce the stress concentration at the edge 16. Moreover, after the batteries are grouped, the edge 16 of the battery is generally not arranged opposite to the side of the adjacent battery, and the edge 16 of the battery is generally arranged opposite to the edge 16 of the adjacent battery, and the high-temperature gas ejected from the edge 16 is generally ejected in an inclined and directional manner, so that the high-temperature gas will not be ejected to the adjacent battery, and in the event of overheating of one battery, the adjacent battery will not be affected.

[0069] Moreover, in general, the bottom wall plate 15 of the battery is arranged closer to the bottom plate of the battery box, and the bottom plate of the battery box is arranged farther away from the passenger compartment. The through hole 132 is arranged on the edge 16 where the side panel 14 and the bottom wall plate 15 are connected, so that the high-temperature gas will not be sprayed into the passenger compartment, avoiding affecting the personal safety of the occupants when the battery is overheated.

[0070] Of course, in some other exemplary embodiments of the present disclosure, the through hole 132 may be provided at the corner portion 17 where at least three sides of the metal shell 11 are connected. For example, the through hole 132 may be provided at the corner portion 17 where two adjacent side panels 14 are connected to the bottom wall panel 15. The corner portion 17 of the metal shell 11 is formed by stamping or stretching, resulting in a relatively concentrated stress at the corner portion 17. Providing the through hole 132 at the corner portion 17 of the metal shell 11 can reduce the stress concentration at the corner portion 17. Moreover, after the batteries are grouped, the corner portion 17 of the battery is generally not arranged opposite to the side of the adjacent battery. The corner portion 17 of the battery is generally arranged opposite to the corner portion 17 of the adjacent battery, and the high-temperature gas ejected from the corner portion 17 is generally ejected in an inclined and directional manner, so that the high-temperature gas will not be ejected to the adjacent battery. In the event that one battery is overheated, the adjacent battery will not be affected.

[0071] Moreover, in general, the bottom wall plate 15 of the battery is arranged closer to the bottom plate of the battery box, and the bottom plate of the battery box is arranged farther away from the passenger compartment. The through hole 132 is arranged at the corner portion 17 where the two adjacent side panels 14 and the bottom wall plate 15 are connected, so that the high-temperature gas will not be sprayed into the passenger compartment, avoiding affecting the personal safety of the occupants when the battery is overheated.

[0072] In addition, in some other exemplary embodiments of the present disclosure, the through hole 132 may also be provided on the metal shell 11 forming the side plate 14 , and the through hole 132 may also be provided on the metal shell 11 forming the bottom wall plate 15 .

[0073] The wall thickness H2 of the metal shell 11 is greater than or equal to 0.1 mm and less than or equal to 0.45 mm. For example, the wall thickness H2 of the metal shell 11 can be 0.13 mm, 0.15 mm, 0.18 mm, 0.2 mm, 0.22 mm, 0.25 mm, 0.27 mm, 0.3 mm, 0.33 mm, 0.35 mm, 0.38 mm, 0.4 mm, 0.42 mm, etc.

[0074] If the wall thickness H2 of the metal shell 11 is too small, the strength of the battery shell 1 cannot be guaranteed, and the battery cell 2 cannot be effectively protected and supported. If the wall thickness H2 of the metal shell 11 is too thick, it is not conducive to improving the energy density of the battery.

[0075] The above numerical range not only ensures the strength of the battery case 1 so that the battery case 1 can effectively protect and support the battery cell 2 , but also ensures that the energy density of the battery is not affected.

[0076] The "parallel" and "perpendicular" mentioned in this application can not only be completely parallel or perpendicular, but also can have a certain error; for example, if the angle between the two is greater than or equal to 0° and less than or equal to 5°, the two are considered to be parallel to each other; if the angle between the two is greater than or equal to 85° and less than or equal to 95°, the two are considered to be perpendicular to each other.

[0077] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the utility model disclosed herein. This application is intended to cover any variations, uses or adaptations of the present disclosure, which follow the general principles of the present disclosure and include common knowledge or customary technical means in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

Claims

1. A battery, characterized in that: include: A battery shell comprises a metal shell and an insulating shell, wherein the insulating shell covers the surface of the metal shell, the metal shell and the insulating shell are an integrally formed structure, and a pressure relief structure is provided on the battery shell, the pressure relief structure comprises a pressure relief portion and a through hole provided on the metal shell, and the pressure relief portion is a portion of the insulating shell arranged opposite to the through hole.

2. The battery according to claim 1, characterized in that The wall thickness of the insulating shell is greater than or equal to 20 μm and less than or equal to 200 μm.

3. The battery according to claim 1, characterized in that The melting point of the insulating shell is greater than or equal to 150° C. and less than or equal to 300° C.

4. The battery according to claim 1, characterized in that A portion of the insulating shell is located in the through hole to form a protrusion.

5. The battery according to any one of claims 1 to 4, characterized in that: The area of ​​the through hole is greater than or equal to 2mm 2 And less than or equal to 50mm 2 .

6. The battery according to any one of claims 1 to 4, characterized in that: The through hole is provided at an edge where two surfaces of the metal shell are connected, or the through hole is provided at a corner where at least three surfaces of the metal shell are connected.

7. The battery according to any one of claims 1 to 4, characterized in that: The wall thickness of the metal shell is greater than or equal to 0.1 mm and less than or equal to 0.45 mm.

8. The battery according to any one of claims 1 to 4, characterized in that: The insulating shell includes an inner insulating shell or an outer insulating shell. The inner insulating shell is arranged on the inner surface of the metal shell, and the outer insulating shell is arranged on the outer surface of the metal shell.

9. The battery according to any one of claims 1 to 4, characterized in that: The insulating shell includes an inner insulating shell and an outer insulating shell. The inner insulating shell is arranged on the inner surface of the metal shell, and the outer insulating shell is arranged on the outer surface of the metal shell. The thickness of the inner insulating shell is greater than the thickness of the outer insulating shell.

10. The battery according to any one of claims 1 to 4, characterized in that: The battery is a quadrangular prism battery.

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