Single battery

Abstract

The utility model relates to the technical field of batteries, and discloses a single battery. The single battery comprises a composite shell and a battery cell, the composite shell comprises a metal layer and an insulating layer which are arranged in a stacked mode, the metal layer and the insulating layer are of an integrally-formed structure, the composite shell is provided with a first wall body, a liquid injection hole is formed in the first wall body, and the ratio of the thickness of the insulating layer of the first wall body to the thickness of the metal layer of the first wall body is larger than or equal to 0.05 and smaller than or equal to 0.9; and the battery cell is arranged in the composite shell. According to the single battery, the insulating layer is not easy to be corroded and damaged by electrolyte, so that the insulating layer can play a role in insulation and isolation, and the short circuit of the single battery is avoided; and the first wall body is ensured not to be warped and deformed even if the first wall body abuts against the liquid injection equipment and is stressed in the liquid injection process.

Description

Technical Field

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

[0002] The composite shell of a single cell is a laminated structure of at least two layers including a metal layer and at least one insulating layer. The insulating layer can improve the insulation performance of the composite shell. It is necessary to set an injection hole on the composite shell to inject electrolyte through the injection hole. However, the wall of the composite shell where the injection hole is set is prone to warping and deformation, or a short circuit may occur at the wall of the composite shell where the injection hole is set.

[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 single cell.

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

[0006] A composite shell, comprising a stacked metal layer and an insulating layer, the metal layer and the insulating layer are an integrally formed structure, the composite shell has a first wall, the first wall is provided with a liquid injection hole, and the ratio of the thickness of the insulating layer of the first wall to the thickness of the metal layer of the first wall is greater than or equal to 0.05 and less than or equal to 0.9;

[0007] The battery cell is arranged in the composite shell.

[0008] In the single cell battery disclosed in the present invention, the ratio of the thickness of the insulating layer of the first wall to the thickness of the metal layer of the first wall is greater than or equal to 0.05 and less than or equal to 0.9, which not only ensures that the insulating layer is not easily corroded and damaged by the electrolyte, so that the insulating layer can play the role of insulating isolation to avoid short circuit of the single cell; but also ensures that the first wall will not warp or deform when it abuts against the injection equipment and is subjected to force during the injection process.

[0009] 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

[0010] 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.

[0011] Figure 1 It is a schematic diagram of the three-dimensional structure of an exemplary embodiment of a single cell disclosed in the present invention.

[0012] Figure 2 It is a cross-sectional schematic diagram of a first exemplary embodiment of a single battery cell disclosed herein.

[0013] Figure 3 It is a cross-sectional schematic diagram of a second exemplary embodiment of a single cell of the present disclosure.

[0014] Figure 4 FIG. 1 is a schematic cross-sectional view of a third exemplary embodiment of a single cell according to the present disclosure.

[0015] Description of reference numerals:

[0016] 1. composite shell; 11. metal layer; 12. insulating layer; 12a. inner insulating layer; 12b. outer insulating layer; 13. first wall; 131. injection hole; 132. injection hole area; 133. non-injection hole area; 14. side plate; 15. bottom wall plate; 16. cover plate;

[0017] 2. battery cell; 21. main body; 22. first pole ear; 23. second pole ear;

[0018] 3. Seals;

[0019] 4. Battery pole; 4a. First battery pole; 4b. Second battery pole. DETAILED DESCRIPTION

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] The exemplary embodiment of the present disclosure provides a single battery, referring to Figure 1-Figure 4 As shown, the single battery may include a composite shell 1 and a battery cell 2; the composite shell 1 may include a stacked metal layer 11 and an insulating layer 12, the metal layer 11 and the insulating layer 12 are an integrally formed structure, the composite shell 1 has a first wall 13, the first wall 13 is provided with a liquid injection hole 131, the ratio of the thickness of the insulating layer 12 of the first wall 13 to the thickness of the metal layer 11 of the first wall 13 is greater than or equal to 0.05 and less than or equal to 0.9; the battery cell 2 is arranged in the composite shell 1.

[0025] The single cell battery disclosed in the present invention not only ensures that the insulating layer 12 is not easily damaged by corrosion of the electrolyte, so that the insulating layer 12 can play the role of insulation isolation to avoid short circuit of the single cell; but also ensures that the first wall 13 will not bend or deform when it abuts against the injection equipment and is subjected to force during the injection process.

[0026] In this example embodiment, the single battery may be a quadrangular prism battery. Figure 1As shown, the composite shell 1 of the quadrangular prism battery can be set as a rectangular parallelepiped structure. Specifically, the composite shell 1 may include six wall panels, which are a cover plate 16, a bottom wall plate 15 and four side plates 14. The four side plates 14 are arranged opposite to each other in pairs; the four side plates 14 are connected end to end in sequence to form a rectangular cylindrical shape. The bottom wall plate 15 is connected to one side of the four side plates 14, and the cover plate 16 is connected to the other side of the four side plates 14, so that the cover plate 16, the bottom wall plate 15 and the four side plates 14 surround to form a accommodating cavity.

[0027] Of course, in some other example embodiments of the present disclosure, the bottom wall plate 15 and the cover plate 16 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 composite shell 1 is formed into a cylindrical shape, an elliptical cylinder shape, other polygonal column shape, etc., so that the single battery is a cylindrical battery, an elliptical cylindrical battery, other polygonal prismatic battery, etc.

[0028] Reference Figure 2-Figure 4 As shown, the composite shell 1 may include a stacked metal layer 11 and an insulating layer 12 , so that the cover plate 16 , the bottom wall plate 15 and the four side plates 14 of the composite shell 1 are all at least two-layer stacked structures including a metal layer 11 and at least one insulating layer 12 .

[0029] The metal layer 11 and the insulating layer 12 are an integrally formed structure, that is, the metal layer 11 and the insulating layer 12 are formed by an integrally formed process. For example, a layer of insulating film can be formed on a metal plate by bonding, coating, hot melting and other processes, and then the metal plate formed with the insulating film is subjected to a stamping process or a stretching process, so that the metal plate formed with the insulating film forms a composite shell 1 with a accommodating cavity, that is, the metal plate forms the metal layer 11, and the insulating film forms the insulating layer 12. The integrally formed structure does not first form the metal layer 11 with a accommodating cavity by a stamping process or a stretching process on the metal plate, and then form the insulating layer 12 on the metal layer 11 by bonding, coating, hot melting and other processes. The integrally formed structure makes the connection between the metal layer 11 and the insulating layer 12 tighter, and there is almost no gap between the metal layer 11 and the insulating layer 12. Moreover, the preparation process is relatively simple, which is conducive to improving efficiency.

[0030] The material of the metal layer 11 can be stainless steel (SUS304), cold-rolled carbon steel (SPCC / SPCE), copper, titanium, nickel, chromium, aluminum or aluminum alloy, etc. Of course, it can also be other materials, which are not described here one by one.

[0031] In this example implementation, refer to Figure 2-Figure 4 As shown, a battery cell 2 is arranged in the accommodating cavity of the composite shell 1. The battery cell 2 is arranged as a rectangular parallelepiped adapted to the composite shell 1. The battery cell 2 is the smallest unit for charging and discharging a single battery.

[0032] 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 layers, that is, the battery cell 2 may include a plurality of first pole pieces and second pole pieces arranged in layers, 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.

[0033] 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.

[0034] 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 .

[0035] 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.

[0036] 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 .

[0037] 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.

[0038] An electrolyte is provided in the accommodating cavity of the composite shell 1. When the single cell is charged and discharged, the electrolyte provides a path for the transmission of ions. The electrolyte is injected through the injection hole 131 after the single cell is installed. Therefore, the injection hole 131 needs to be provided on the composite shell 1. However, the wall of the composite shell 1 where the injection hole 131 is provided is prone to warping and deformation, or a short circuit defect occurs at the wall of the composite shell 1 where the injection hole 131 is provided.

[0039] In this example implementation, refer to Figure 2-Figure 4As shown, the composite shell 1 has a first wall 13. For example, the first wall 13 may be a cover plate 16 of the composite shell 1. Therefore, the first wall 13 is also a laminated structure of at least two layers including a metal layer 11 and at least one insulating layer 12. Of course, in some other exemplary embodiments of the present disclosure, the first wall 13 may also be a bottom wall plate 15 of the composite shell 1, and the first wall 13 may also be a side plate 14 of the composite shell 1.

[0040] Reference Figure 2 As shown, the first wall 13 is provided with a liquid injection hole 131, and the ratio of the thickness H3 of the insulating layer 12 of the first wall 13 to the thickness H4 of the metal layer 11 of the first wall 13 is greater than or equal to 0.05 and less than or equal to 0.9. For example, the ratio of the thickness H3 of the insulating layer 12 of the first wall 13 to the thickness H4 of the metal layer 11 of the first wall 13 can be 0.07, 0.1, 0.13, 0.15, 0. .18, 0.2, 0.22, 0.25, 0.27, 0.3, 0.33, 0.35, 0.38, 0.4, 0.42, 0.45, 0.47, 0.5, 0.53, 0.55, 0.58, 0.6, 0.62, 0.65, 0.67, 0.7, 0.73, 0.75, 0.78, 0.8, 0.82, 0.85, 0.87 and so on.

[0041] If the ratio of the thickness H3 of the insulating layer 12 of the first wall 13 to the thickness H4 of the metal layer 11 of the first wall 13 is too small, the thickness H3 of the insulating layer 12 of the first wall 13 is too small, and the insulating layer 12 is easily corroded and damaged by the electrolyte. The insulating layer 12 cannot play the role of insulation isolation, resulting in an increased risk of short circuit of the single cell.

[0042] If the ratio of the thickness H3 of the insulating layer 12 of the first wall body 13 to the thickness H4 of the metal layer 11 of the first wall body 13 is too large, the thickness H4 of the metal layer 11 of the first wall body 13 will be too small, resulting in too small strength of the first wall body 13. Moreover, after the injection hole 131 is opened on the first wall body 13, the first wall body 13 abuts against the injection equipment during the injection process and is subjected to force, causing the first wall body 13 to warp and deform.

[0043] The above numerical range not only ensures that the insulating layer 12 is not easily corroded and damaged by the electrolyte, so that the insulating layer 12 can play the role of insulation isolation to avoid short circuit of the single battery; but also ensures that the first wall 13 will not warp or deform when it abuts against the injection equipment and is subjected to force during the injection process.

[0044] In this example implementation, refer to Figure 2-Figure 4As shown, the first wall 13 has a liquid injection hole area 132 and a non-liquid injection hole area 133. The area of ​​the first wall 13 where the liquid injection hole 131 is provided is the liquid injection hole area 132, and the area of ​​the first wall 13 where the liquid injection hole 131 is not provided is the non-liquid injection hole area 133. The side of the liquid injection hole area 132 close to the battery cell 2 is arranged closer to the battery cell 2 than the side of the non-liquid injection hole area 133 close to the battery cell 2, that is, the distance between the side of the liquid injection hole area 132 close to the battery cell 2 and the battery cell 2 is small. After the electrolyte is injected from the liquid injection hole 131, the drop generated by the electrolyte to the battery cell 2 is small, thereby avoiding the falling of the first pole piece and the second pole piece and the deformation of the first pole ear 22 and the second pole ear 23 caused by the impact force and scouring force of the electrolyte on the battery cell 2.

[0045] In this example implementation, refer to Figure 2 As shown, the distance between the side of the injection hole area 132 close to the battery cell 2 and the opening end face of the injection hole 131 away from the battery cell 2 is H1; the distance between the side of the non-injection hole area 133 close to the battery cell 2 and the opening end face of the injection hole 131 away from the battery cell 2 is H2.

[0046] The ratio of H1 to H2 is greater than or equal to 0.5 and less than or equal to 10. For example, the ratio of H1 to H2 can be 1, 1.3, 1.5, 1.8, 2, 2.2, 2.5, 2.7, 3, 3.3, 3.5, 3.8, 4, 4.2, 4.5, 4.7, 5, 5.3, 5.5, 5.8, 6, 6.2, 6.5, 6.7, 7, 7.3, 7.5, 7.8, 8, 8.2, 8.5, 8.7, 9, 9.3, 9.5, 9.8, etc.

[0047] Specifically, the distance H1 between the side of the injection hole area 132 close to the battery cell 2 and the open end surface of the injection hole 131 away from the battery cell 2 is greater than or equal to 0.8 mm and less than or equal to 5 mm. For example, the distance H1 between the side of the injection hole area 132 close to the battery cell 2 and the open end surface of the injection hole 131 away from the battery cell 2 can be 1 mm, 1.2 mm, 1.5 mm, 1.7 mm, 2 mm, 2.3 mm, 2.5 mm, 2.8 mm, 3 mm, 3.2 mm, 3.5 mm, 3.7 mm, 4 mm, 4.3 mm, 4.5 mm, 4.8 mm, etc.

[0048] The distance H2 between the side of the non-injection hole area 133 close to the battery cell 2 and the open end surface of the injection hole 131 away from the battery cell 2 is greater than or equal to 0.45 mm and less than or equal to 1.8 mm. For example, the distance H2 between the side of the non-injection hole area 133 close to the battery cell 2 and the open end surface of the injection hole 131 away from the battery cell 2 can be 0.7 mm, 1 mm, 1.3 mm, 1.5 mm, etc.

[0049] If the ratio of H1 to H2 is too large, the distance H2 between the side of the non-injection hole area 133 close to the battery cell 2 and the open end face of the injection hole 131 away from the battery cell 2 is too small. It can be said that the wall thickness of the first wall 13 is too small, resulting in relatively weak strength of the first wall 13. During the electrolyte injection process, the first wall 13 abuts against the injection equipment and is subjected to force, causing the first wall 13 to warp and deform.

[0050] If the ratio of H1 to H2 is too small, the distance H1 between the side of the injection hole area 132 close to the battery cell 2 and the open end face of the injection hole 131 away from the battery cell 2 is too small, so that the distance between the side of the injection hole area 132 close to the battery cell 2 and the battery cell 2 is too large. After the electrolyte is injected from the injection hole 131, the height difference from the electrolyte to the battery cell 2 is large, resulting in the impact force and scouring force of the electrolyte on the battery cell 2, causing the first pole piece and the second pole piece to fall off and the first pole ear 22 and the second pole ear 23 to deform.

[0051] The above numerical range not only ensures that the strength of the first wall 13 is sufficient, and during the electrolyte injection process, the first wall 13 abuts against the injection equipment and is subjected to force without warping or deformation; it also ensures that after the electrolyte is injected from the injection hole 131, the height difference from the electrolyte to the battery cell 2 is small, and the impact force and scouring force of the electrolyte on the battery cell 2 will not cause the first pole piece and the second pole piece to fall off and the first pole ear 22 and the second pole ear 23 to deform.

[0052] It should be noted that the opening end face of the injection hole 131 facing away from the battery cell 2 refers to the outermost opening end face of the injection hole 131 , or the opening end face formed by the edge line of the opening of the injection hole 131 on the outer surface of the cover plate 16 .

[0053] In this example implementation, refer to Figure 2 As shown, the distance H5 between the side of the injection hole area 132 close to the battery cell 2 and the side of the battery cell 2 close to the first wall 13 is greater than or equal to 1 mm and less than or equal to 15 mm. For example, the distance H5 between the side of the injection hole area 132 close to the battery cell 2 and the side of the battery cell 2 close to the first wall 13 can be 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, 10.5mm, 11mm, 11.5mm, 12mm, 12.5mm, 13mm, 13.5mm, 14mm, 14.5mm, etc.

[0054] If the distance H5 between the side of the injection hole area 132 close to the battery cell 2 and the side of the battery cell 2 close to the first wall 13 is too large, after the electrolyte is injected from the injection hole 131, the height difference from the electrolyte to the battery cell 2 is large, resulting in the impact force and scouring force of the electrolyte on the battery cell 2, causing the first pole piece and the second pole piece to fall off and the first pole ear 22 and the second pole ear 23 to deform.

[0055] If the distance H5 between the side of the injection hole area 132 close to the battery cell 2 and the side of the battery cell 2 close to the first wall 13 is too small, the electrolyte directly flows to a smaller area of ​​the battery cell 2, the electrolyte is not easy to diffuse, and the infiltration rate of the electrolyte into the battery cell 2 cannot be guaranteed.

[0056] The above numerical range not only ensures the infiltration rate of the electrolyte into the battery cell 2, but also ensures that after the electrolyte is injected from the injection hole 131, the drop from the electrolyte to the battery cell 2 is small, and the impact force and scouring force of the electrolyte on the battery cell 2 will not cause the first pole piece and the second pole piece to fall off and the first pole ear 22 and the second pole ear 23 to deform.

[0057] In this example implementation, refer to Figure 2-Figure 4 As shown, the injection hole 131 can be set as a step hole, for example, the injection hole 131 can be set as a step hole with a smaller hole diameter on the side close to the battery cell 2 and a larger hole diameter on the side away from the battery cell 2, so that the step hole has a step surface. In this way, the infiltration rate of the injection hole 131 can be increased to prevent excessive electrolyte from spilling onto the outside of the composite shell 1 during the injection process.

[0058] The insulating layer 12 is not provided on the step surface of the step hole. For example, the insulating layer 12 may be provided only in the non-injection hole area 133 of the first wall 13, and the insulating layer 12 is not provided in the injection hole area of ​​the first wall 13, so that only the metal layer 11 is provided in the injection hole area.

[0059] The single cell may further include a seal 3, which is welded to the metal layer 11 on the step surface to seal the injection hole 131; welding can ensure the sealing effect of the seal 3 on the injection hole 131. The melting point of the insulating layer 12 is relatively low. During welding, the insulating layer 12 will first melt to form high-temperature droplets and flow, resulting in welding holes (i.e., explosion holes) when the seal 3 is welded to the metal layer 11, affecting the sealing effect of the seal 3 on the injection hole 131. Avoiding the insulating layer 12 at the welding position can avoid explosion holes, thereby ensuring the sealing effect of the seal 3 on the injection hole 131.

[0060] The sealing member 3 may include a sealing cap and a sealing rod. The sealing cap is welded to the metal layer 11 on the step surface, and the sealing rod extends into a through hole with a smaller aperture of the injection hole 131 .

[0061] In this example implementation, refer to Figure 3 As shown, the minimum diameter of the injection hole 131 Greater than or equal to 1.5 mm and less than or equal to 10 mm, that is, the diameter of the injection hole 131 is smaller than the diameter of the through hole Greater than or equal to 1.5mm and less than or equal to 10mm. For example, the minimum diameter of the injection hole 131 can be 1.7mm, 2mm, 2.3mm, 2.5mm, 2.8mm, 3mm, 3.2mm, 3.5mm, 3.7mm, 4mm, 4.3mm, 4.5mm, 4.8mm, 5mm, 5.2mm, 5.5mm, 5.7mm, 6mm, 6.3mm, 6.5mm, 6.8mm, 7mm, 7.2mm, 7.5mm, 7.7mm, 8mm, 8.3mm, 8.5mm, 8.8mm, 9mm, 9.2mm, 9.5mm, 9.7mm, etc.

[0062] If the minimum diameter of the injection hole 131 is If the diameter is too small, the injection efficiency will be affected and the injection time will be too long. During the injection, the first wall 13 will be in contact with the injection device and subjected to force for too long, which will cause the first wall 13 to be easily warped.

[0063] If the minimum diameter of the injection hole 131 is If the diameter is too large, the strength of the first wall 13 will be affected. When the liquid is injected, the first wall 13 will be in contact with the injection device and subjected to force, which may cause the first wall 13 to be easily warped and deformed.

[0064] The above numerical range not only ensures the injection efficiency, but also ensures the strength of the first wall 13, so that the first wall 13 is not prone to warping and deformation.

[0065] In this example implementation, refer to Figure 2 As shown, the insulating layer 12 may be an inner insulating layer 12a, that is, the insulating layer 12 is disposed on the inner surface of the metal layer 11, so that the inner insulating layer 12a is disposed closer to the battery cell 2 relative to the metal layer 11. The inner insulating layer 12a can increase the ability of the composite housing 1 to resist corrosion from the electrolyte, and increase the insulation effect between the composite housing 1 and the battery cell 2.

[0066] Furthermore, the inner insulating layer 12 a is not provided in the injection hole region 132 , so as to prevent the inner insulating layer 12 a from affecting the welding between the sealing member 3 and the step surface of the injection hole 131 .

[0067] In addition, in some other exemplary embodiments of the present disclosure, referring to Figure 3As shown, the insulating layer 12 may be an outer insulating layer 12b, that is, the insulating layer 12 is disposed on the outer surface of the metal layer 11, so that the outer insulating layer 12b is disposed farther away from the battery core 2 relative to the metal layer 11. The outer insulating layer 12b can increase the insulation effect between the composite housing 1 and other external components.

[0068] Furthermore, the outer insulating layer 12 b is not provided in the injection hole region 132 , so as to prevent the outer insulating layer 12 b from affecting the welding between the sealing member 3 and the step surface of the injection hole 131 .

[0069] Of course, in some further exemplary embodiments of the present disclosure, reference Figure 4 As shown, the insulating layer 12 can be provided as two layers, and the two insulating layers 12 are an inner insulating layer 12a and an outer insulating layer 12b. The inner insulating layer 12a is provided on the inner surface of the metal layer 11, so that the inner insulating layer 12a is provided closer to the battery cell 2 relative to the metal layer 11. The inner insulating layer 12a can increase the ability of the composite shell 1 to resist corrosion by the electrolyte, and increase the insulation effect between the composite shell 1 and the battery cell 2.

[0070] The outer insulating layer 12b is disposed on the outer surface of the metal layer 11, so that the outer insulating layer 12b is disposed farther away from the battery core 2 than the metal layer 11. The outer insulating layer 12b can increase the insulation effect between the composite housing 1 and other external components.

[0071] Furthermore, the inner insulating layer 12 a and the outer insulating layer 12 b are not provided in the injection hole region 132 , so as to prevent the inner insulating layer 12 a and the outer insulating layer 12 b from affecting the welding between the sealing member 3 and the step surface of the injection hole 131 .

[0072] The material of the inner insulating layer 12a can be a polymer or a resin. For example, the material of the insulating layer 12 can be polyethylene (PE), polytetrafluoroethylene (PTFE), polypropylene (PP), polyimide (PI), polyethylene terephthalate (PET), polycarbonate (PC), LCP plastic material (LIQUID CRYSTAL POLYMER, also known as liquid crystal polymer), soluble polytetrafluoroethylene (PFA), acrylonitrile-butadiene-styrene copolymer (ABS), polyphenylene sulfide (PPS), etc.

[0073] The material of the outer insulating layer 12b may be an inorganic non-metallic material, for example, the material of the outer insulating layer 12b may be Al2O3, SiC, SiO2, etc.

[0074] Of course, in some other exemplary embodiments of the present disclosure, the material of the inner insulating layer 12a may be an inorganic non-metallic material, for example, the material of the outer insulating layer 12b may be Al2O3, SiC, SiO2, etc. The material of the outer insulating layer 12b may be a polymer or a resin, for example, the material of the insulating layer 12 may be polyethylene (PE), polytetrafluoroethylene (PTFE), polypropylene (PP), polyimide (PI), polyethylene terephthalate (PET), polycarbonate (PC), LCP plastic material (LIQUIDCRYSTAL POLYMER, also known as liquid crystal polymer), soluble polytetrafluoroethylene (PFA), acrylonitrile-butadiene-styrene copolymer (ABS), polyphenylene sulfide (PPS), etc.

[0075] In addition, the inner insulating layer 12a and / or the outer insulating layer 12b may not be provided at the position where the cover plate 16 and the side plate 14 are welded to avoid the inner insulating layer 12a and / or the outer insulating layer 12b affecting the welding between the cover plate 16 and the side plate 14.

[0076] In this example implementation, refer to Figure 1-Figure 4 As shown, the single battery may further include a battery pole 4, which is insulated and connected to the first wall 13. Specifically, two through holes are provided on the first wall 13, and the battery pole 4 is provided with two first battery poles 4a and second battery poles 4b, respectively. The first battery poles 4a and second battery poles 4b pass through the two through holes in a one-to-one correspondence, and insulating members are provided between the first battery poles 4a and second battery poles 4b and the first wall 13, and the first battery poles 4a and second battery poles 4b are insulated and isolated from the first wall 13 by the insulating members. The battery pole 4 may include a riveted portion, and the battery pole 4 is fixedly connected to the first wall 13 by the riveted portion.

[0077] The first pole tab 22 can be connected to the first battery pole 4a, so that the first battery pole 4a can form the positive pole of the battery; the second pole tab 23 can be connected to the second battery pole 4b, so that the second battery pole 4b can form the negative pole of the battery.

[0078] When the insulating layer 12 is provided with two layers, namely the inner insulating layer 12a and the outer insulating layer 12b, the insulating effect between the battery pole 4 and the composite shell 1 can be enhanced by the inner insulating layer 12a and the outer insulating layer 12b.

[0079] 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.

[0080] 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 single cell battery, characterized in that: include: A composite shell, comprising a stacked metal layer and an insulating layer, wherein the metal layer and the insulating layer are an integrally formed structure, the composite shell having a first wall, the first wall being provided with a liquid injection hole, and the ratio of the thickness of the insulating layer of the first wall to the thickness of the metal layer of the first wall being greater than or equal to 0.05 and less than or equal to 0.9; The battery core is arranged in the composite shell.

2. The single cell according to claim 1, characterized in that: The first wall has a liquid injection hole area and a non-liquid injection hole area, and a surface of the liquid injection hole area close to the battery cell is arranged closer to the battery cell than a surface of the non-liquid injection hole area close to the battery cell.

3. The single cell according to claim 2, characterized in that: The distance between a side of the injection hole area close to the battery cell and an open end face of the injection hole away from the battery cell is H1, the distance between a side of the non-injection hole area close to the battery cell and an open end face of the injection hole away from the battery cell is H2, and the ratio of H1 to H2 is greater than or equal to 0.5 and less than or equal to 10.

4. The single cell according to claim 2, characterized in that: The distance H1 between a side of the injection hole area close to the battery cell and an open end face of the injection hole away from the battery cell is greater than or equal to 0.8 mm and less than or equal to 5 mm, and / or, the distance H2 between a side of the non-injection hole area close to the battery cell and an open end face of the injection hole away from the battery cell is greater than or equal to 0.45 mm and less than or equal to 1.8 mm.

5. The single cell according to claim 2, characterized in that: A distance between a surface of the injection hole region close to the battery core and a surface of the battery core close to the first wall is greater than or equal to 1 mm and less than or equal to 15 mm.

6. The single cell according to any one of claims 1 to 5, characterized in that: The injection hole is configured as a stepped hole.

7. The single cell according to claim 6, characterized in that: The insulating layer is not provided on the step surface of the step hole, and the single cell further comprises: A sealing member is welded to the metal layer of the step surface to seal the liquid injection hole.

8. The single cell according to any one of claims 1 to 5, characterized in that: The minimum diameter of the injection hole is greater than or equal to 1.5 mm and less than or equal to 10 mm.

9. The single cell according to any one of claims 1 to 5, characterized in that: The insulating layer is an inner insulating layer or an outer insulating layer; or, the insulating layer is provided as two layers, the two insulating layers being an inner insulating layer and an outer insulating layer; the inner insulating layer is provided on the inner surface of the metal layer, and the outer insulating layer is provided on the outer surface of the metal layer.

10. The single cell according to any one of claims 1 to 5, characterized in that: The single cell battery further comprises: The battery pole is insulated and connected to the first wall.

11. The single cell according to any one of claims 1 to 5, characterized in that: The single cell is a quadrangular prism cell.

Images