Shell assembly, battery cell and battery

Abstract

The utility model provides a shell assembly, a battery cell and a battery, and relates to the technical field of batteries. The shell assembly comprises an aluminum shell body and an end cover. The aluminum shell body is provided with a mounting cavity which is used for mounting electrolyte. The end cover is installed at one end of the aluminum shell body and seals a cavity opening of the installation cavity, and a pole is installed on the end cover. Wherein the aluminum shell body is provided with a liquid injection hole, and the liquid injection hole and the pole are arranged on different planes. According to the shell assembly provided by the embodiment of the invention, the liquid injection hole and the pole column are arranged on different planes, so that the possibility of short circuit of the battery in an assembling process or a using process after electrolyte leakage can be reduced.

Description

Technical Field

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

[0002] A battery is a device that can convert chemical energy into electrical energy, and can provide electrical energy to many electrical appliances, keeping them in working order. Existing batteries are widely used in power fields such as automobiles, engineering machinery and equipment, and ships. They can also be used for household energy storage, industrial and commercial energy storage, and communication base stations.

[0003] The battery generally includes a housing, a cover plate and other structures. Based on the structure of existing batteries, a short circuit may occur during the assembly or use of the battery. Utility Model Content

[0004] The present application provides a shell assembly, a battery cell and a battery to reduce the possibility of battery short circuit during assembly or use.

[0005] In the first aspect, the present application provides a shell assembly, which includes an aluminum shell body and an end cover. The aluminum shell body is provided with an installation cavity, and the installation cavity is used to install electrolyte. The end cover is installed at one end of the aluminum shell body and seals the cavity opening of the installation cavity, and a pole is installed on the end cover. The aluminum shell body is provided with a liquid injection hole, and the liquid injection hole and the pole are arranged in different planes.

[0006] The aluminum shell body provided in the example of the present application can provide an installation space for the electrolyte. The end cover can seal the cavity opening of the installation cavity to reduce the possibility of electrolyte leakage from the installation cavity.

[0007] Since the injection hole and the pole on the aluminum shell body are arranged on different planes, even if the electrolyte leaks during the assembly process or use of the battery cell, the electrolyte needs to flow from the injection hole through different planes to reach the pole before the shell assembly and the pole can be electrically connected, so that the possibility of the electrolyte connecting the shell assembly and the pole is also low, thereby reducing the possibility of a short circuit in the battery cell.

[0008] In some possible implementations, the injection hole is provided on the side wall of the aluminum shell body. Alternatively, the injection hole is provided on the bottom wall of the aluminum shell body, and the bottom wall is provided on the side of the aluminum shell body away from the end cover.

[0009] In the example of the present application, the injection hole can be arranged on the side wall or bottom wall of the aluminum shell body. In the case where the injection hole is arranged on the side wall of the aluminum shell body, if the electrolyte leaks, the electrolyte needs to flow from the injection hole on the side wall through part of the side wall and part of the end cover to the pole. Compared with the prior art in which both the injection hole and the pole are arranged on the end cover, the flow path of the electrolyte can be extended, and the possibility of the electrolyte electrically connecting the aluminum shell body and the pole is reduced.

[0010] When the injection hole is arranged on the bottom wall of the aluminum shell body, if electrolyte leakage occurs, the electrolyte needs to flow out from the injection hole, flow through part of the bottom wall, the side wall of the aluminum shell body and part of the end cover to reach the pole. Compared with the prior art in which the injection hole and the pole are both arranged on the end cover, the flow path of the electrolyte can be extended and the possibility of the electrolyte electrically connecting the aluminum shell body and the pole is reduced.

[0011] In some possible implementations, when the liquid injection hole is provided on the bottom wall, the geometric center of the liquid injection hole substantially coincides with the geometric center of the bottom wall.

[0012] When the geometric center of the injection hole substantially coincides with the geometric center of the bottom wall, it is convenient for the injection device to position the injection hole when the size of the bottom wall is known, thereby improving the injection efficiency.

[0013] In addition, since the geometric center of the injection hole basically coincides with the geometric center of the bottom wall, the distance that the electrolyte entering the mounting cavity from the injection hole reaches the side wall on the same horizontal plane is basically the same, which facilitates the electrolyte to infiltrate the electrode in the mounting cavity.

[0014] In some possible implementations, the injection hole includes a first sub-hole and a second sub-hole that are interconnected, the second sub-hole is disposed away from the mounting cavity compared to the first sub-hole, and the size of the second sub-hole is larger than that of the first sub-hole.

[0015] Since the second sub-hole is arranged away from the installation cavity compared to the first sub-hole, and the size of the second sub-hole is larger than that of the first sub-hole, when the liquid injection device extends into the liquid injection hole to inject electrolyte into the installation cavity, the liquid injection device first extends into the second sub-hole, that is, the liquid injection hole first extends into the end of the liquid injection hole with a larger size, which facilitates the liquid injection device to align with the liquid injection hole and improves the liquid injection efficiency.

[0016] In some possible implementations, the housing assembly further includes a sealing structure, and the sealing structure at least partially penetrates the liquid injection hole and seals the liquid injection hole.

[0017] By providing a sealing structure, the injection hole can be sealed, thereby reducing the possibility of electrolyte leakage from the injection hole to the outside of the installation cavity, and further reducing the possibility of short circuit between the shell assembly and the pole.

[0018] In some possible implementations, the shell assembly further includes an explosion-proof structure, and the aluminum shell body is further provided with a mounting hole, the mounting hole being used to assemble the explosion-proof structure, and the mounting hole is spaced apart from the injection hole.

[0019] When the gas pressure in the battery cell installation cavity is high, the pressure relief action of the explosion-proof structure can be used to make the working environment in the installation cavity more stable, thereby extending the reliability and service life of the battery cell.

[0020] By arranging the installation hole and the injection hole at intervals, the possibility of interference between the injection equipment and the explosion-proof structure can be reduced during the injection operation, thereby reducing the possibility of damage to the explosion-proof structure.

[0021] In some possible implementations, the distance between the mounting hole and the injection hole is greater than or equal to 5 mm.

[0022] By setting the distance between the mounting hole and the injection hole to be greater than or equal to 5 mm, the possibility of interference between the injection equipment and the explosion-proof structure can be further reduced during the injection operation, thereby reducing the possibility of damage to the explosion-proof structure.

[0023] In some possible implementations, the mounting hole includes a third sub-hole and a fourth sub-hole that are interconnected, the fourth sub-hole is disposed away from the end cover compared to the third sub-hole, and the size of the fourth sub-hole is larger than that of the third sub-hole.

[0024] In summary, since the fourth sub-hole is arranged away from the installation cavity compared to the third sub-hole, and the size of the fourth sub-hole is larger than that of the third sub-hole, during the assembly of the explosion-proof structure and the installation hole, the explosion-proof structure first extends into the fourth sub-hole, that is, the explosion-proof structure first extends into the end of the installation hole with a larger size, which is convenient for improving the installation efficiency of the explosion-proof structure and the aluminum shell body.

[0025] A second aspect of the present application provides a battery cell, which includes a pole, an electrolyte, and a shell assembly provided in any of the above examples, wherein the pole is installed in the shell assembly and the electrolyte is disposed in the shell assembly.

[0026] The beneficial effects of the battery cells provided in the second aspect and the various possible designs of the second aspect can be referred to the beneficial effects brought about by the first aspect and the various possible implementation methods of the first aspect, and will not be repeated here.

[0027] A third aspect of the present application provides a battery, which includes the battery cell mentioned in the above example.

[0028] The beneficial effects of the battery provided in the third aspect and each possible design of the third aspect can be referred to the beneficial effects brought about by the second aspect and each possible implementation manner of the second aspect, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of the structure of a battery cell from a first perspective provided as an example in this application.

[0030] Figure 2 A schematic diagram of the structure of a battery cell from a second perspective provided as an example in this application.

[0031] Figure 3 A structural schematic diagram of a shell assembly from a first perspective provided as an example in this application.

[0032] Figure 4 A structural schematic diagram of a shell assembly from a second perspective provided as an example in this application.

[0033] Figure 5 For along Figure 4 Cross-sectional view at AA in the middle.

[0034] Figure 6 for Figure 5 A local enlarged schematic diagram of point A in the middle.

[0035] Figure 7 A schematic diagram of an explosion of a battery cell provided as an example of this application.

[0036] Figure 8 for Figure 5 A local enlarged schematic diagram of point B in the middle.

[0037] Description of reference numerals:

[0038] 100, shell assembly; 110, aluminum shell body; 111, side wall; 112, bottom wall; 1121, injection hole; K1, first sub-hole; K2, second sub-hole; 1122, mounting hole; K3, third sub-hole; K4, fourth sub-hole; K41, fixing hole; K42, clearance hole; 120, end cover; 200, pole; 130, sealing structure; 131, rubber nail; 132, sealing nail; 140, explosion-proof structure; L1, first distance; L2, second distance. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the examples of this application clearer, the technical solution in the examples of this application will be clearly and completely described below in conjunction with the drawings in the examples of this application. Obviously, the described examples are part of the examples of this application, not all of them. Based on the examples in this application, all other examples obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of the application herein are only for the purpose of describing specific examples and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification, claims and drawings of this application are intended to cover non-exclusive inclusions.

[0041] Reference to "examples" herein means that a particular feature, structure, or characteristic described in conjunction with the examples may be included in at least one example of the present application. The appearance of the phrase "example" in various locations in the specification does not necessarily refer to the same example, nor is it an independent or alternative example that is mutually exclusive with other examples. It is explicitly and implicitly understood by those skilled in the art that the examples described herein may be combined with other examples.

[0042] The term "and / or" in this article is only 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, A and B exist at the same time, and B exists. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0043] The directional words appearing in the following description are all directions shown in the drawings, and do not limit the specific structure of the shell assembly, battery cell and battery of the present application.

[0044] In addition, the terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0045] In the description of the present application, unless otherwise specified, "plurality" means more than two (including two), and similarly, "multiple groups" means more than two groups (including two).

[0046] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, the "connection" or "connection" of a mechanical structure may refer to a physical connection. For example, the physical connection may be a fixed connection, such as a fixed connection through a barrier, such as a fixed connection through screws, bolts or other barrier; the physical connection may also be a detachable connection, such as a mutual snap-on or snap-fit ​​connection; the physical connection may also be an integral connection, such as a connection formed by welding, bonding or integral molding. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0047] A battery is a device that can provide electrical energy to electrical appliances, allowing them to be in working condition. A battery generally includes a cover plate structure and a housing structure.

[0048] Based on the existing aluminum shell battery, the shell is generally used as the negative electrode of the battery, and the pole is used as the positive electrode of the battery. The electric energy converted in the battery can be output to the outside of the shell through the electrodes, and then directly or indirectly transmitted to the electrical appliance to provide electrical energy for the electrical appliance.

[0049] In the prior art, the injection hole is generally arranged together with the pole on one side of the battery. Based on this arrangement, during the assembly of the battery cell, electrolyte is generally injected into the shell through the injection hole. If the electrolyte overflows to the outside of the aluminum shell, the electrolyte may cause the aluminum shell to be electrically connected to the positive electrode of the battery, resulting in a short circuit in the battery cell.

[0050] During the use of the battery cell, there is also the possibility that the electrolyte may leak from the shell, causing the aluminum shell to be electrically connected to the electrode, resulting in a short circuit in the battery cell.

[0051] Based on the above, the present application example provides an electrical device, a housing assembly, a battery cell and a battery.

[0052] In order to enable persons skilled in the art to better understand the present application, the electrical equipment, housing assembly, battery cell and battery provided in the example of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0053] Exemplarily, the present application example provides an electrical device, which includes a battery.

[0054] The electrical equipment uses a battery as its power source. The electrical equipment may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc.

[0055] Next, a brief introduction to the batteries mentioned in the above examples is given.

[0056] Illustratively, the battery may include a containing shell and one or more battery cells. The containing shell is provided with a containing cavity, and the battery cell may be installed in the containing cavity.

[0057] The housing shell can adopt various structures. For example, the housing shell can be in the form of a cylinder, a cuboid or other cubes. The present application example only describes cylindrical batteries as an example.

[0058] In a battery, there may be multiple cells, and the multiple cells may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple cells are connected in series and in parallel. The multiple cells may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple cells may be contained in a containing shell. Of course, the battery may also be a battery module composed of multiple cells connected in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and contained in a containing shell. The battery may also include other structures. For example, the battery may also include a busbar component for realizing electrical connection between multiple battery cells. Each cell may be a secondary battery or a primary battery. It may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto.

[0059] Exemplarily, the present application provides a battery cell. Figure 1A schematic diagram of the structure of a battery cell from a first perspective provided as an example of this application, Figure 2 For a schematic diagram of the structure of a battery cell from a second perspective provided for this application example, please refer to Figure 1 and Figure 2 , the drawings of this application only illustrate the shell assembly as a cylinder. The battery cell may be the battery cell mentioned in the above example. The battery cell may include structures such as electrodes, electrolyte, pole pieces, and shell assembly. The shell assembly may be provided with an installation cavity, the electrolyte may be injected into the installation cavity, and the pole piece may be installed in the installation cavity. The electrode may be installed in the shell assembly.

[0060] The electrodes in the examples of this application may be the same as the electrodes in the prior art, and the examples of this application will not be described in detail. As long as the electrodes can lead the electrical energy in the battery cell to the outside of the shell assembly, it is convenient to directly or indirectly provide electrical energy to the electrical appliances.

[0061] The electrolyte in the examples of this application may also be the same as the electrolyte in the prior art, and the examples of this application do not impose any specific restrictions on the electrolyte.

[0062] Next, the specific structure of the shell assembly is described in detail.

[0063] Exemplarily, the present application provides a housing assembly. Figure 3 For a schematic diagram of the structure of a housing assembly from a first perspective provided in this application example, please refer to Figure 1 and Figure 3 The housing assembly 100 may include an aluminum housing body 110 and an end cap 120. The aluminum housing body 110 is provided with an installation cavity, and the installation cavity is used to install the electrolyte. The end cap 120 may be installed at one end of the aluminum housing body 110 and seal the cavity opening of the installation cavity, and a pole 200 is installed on the end cap 120. The aluminum housing body 110 is provided with a liquid injection hole 1121, and the liquid injection hole 1121 and the pole 200 are arranged in different planes.

[0064] The housing assembly 100 may include an aluminum housing body 110 , or may include a steel housing body. The example of the present application does not limit the specific implementation of the housing assembly 100 .

[0065] The aluminum shell body 110 may be made of aluminum or aluminum alloy. The aluminum shell body 110 may be roughly in the shape of a cuboid, a cube, a cylinder or other three-dimensional structures. The example of this application does not limit the specific shape of the aluminum shell body 110.

[0066] The aluminum shell body 110 may include at least one side wall 111 and a bottom wall 112. For example, when the aluminum shell is cylindrical, the aluminum shell body 110 may include only one side wall 111. When the aluminum shell body 110 is a rectangular parallelepiped, a cube or other shapes, the aluminum shell body 110 may include multiple side walls 111. The side wall 111 and the bottom wall 112 may be welded, the side wall 111 and the bottom wall 112 may be integrally formed, or the side wall 111 and the bottom wall 112 may be connected together in other ways. The example of this application does not limit the specific structure and specific forming method of the aluminum shell body 110.

[0067] The first side wall 111 of the aluminum shell body 110 may be provided with an opening, the area of ​​the opening may be substantially the same as the area of ​​the first side wall 111, or the area of ​​the opening may be smaller than the area of ​​the first side wall 111, the shape of the opening may be consistent with the shape of the side wall 111, or the shape of the opening may be different from the shape of the side wall 111, and the specific setting of the opening is not limited in the example of the present application. The example of the present application is only described by taking the example that the area of ​​the opening is substantially the same as the area of ​​the side wall 111. The opening mentioned here refers to the cavity opening of the accommodating cavity.

[0068] The end cap 120 is matched with the cavity opening, which is specifically embodied in that the shape of the end cap 120 is matched with the shape of the cavity opening, and the size of the end cap 120 is matched with the size of the cavity opening.

[0069] The manufacturing material of the end cover 120 can be the same as the manufacturing material of the aluminum shell body 110, and this application example will not be described in detail here.

[0070] The aluminum shell body 110 may be provided with a liquid injection hole 1121. The operator may inject electrolyte into the installation cavity through the liquid injection hole 1121 to ensure that the battery core can work and convert chemical energy into electrical energy.

[0071] The injection hole 1121 may be spaced apart from the end cover 120. The injection hole 1121 may be disposed on the side wall 111 or the bottom wall 112 of the aluminum shell body 110. The injection hole 1121 may be circular, elliptical, triangular, quadrilateral or other shapes, and the specific arrangement of the injection hole 1121 is not limited in this application example.

[0072] Based on the above, the aluminum shell body 110 can provide an installation space for the electrolyte. The end cover 120 can seal the cavity opening of the installation cavity to reduce the possibility of electrolyte leakage from the installation cavity.

[0073] Since the injection hole 1121 on the aluminum shell body 110 and the pole 200 are arranged on different planes, even if the electrolyte leaks during the assembly process or use of the battery cell, the electrolyte needs to flow from the injection hole 1121 through different planes to reach the pole 200 to electrically connect the shell assembly 100 and the pole 200, so that the possibility of the electrolyte connecting the shell assembly 100 and the pole 200 is low, thereby reducing the possibility of a short circuit in the battery cell.

[0074] Based on the housing assembly 100 provided in the above example, please refer to Figure 3 , Figure 3 Taking the injection hole 1121 being disposed on the bottom wall as an example, the injection hole 1121 can be disposed on the side wall 111 of the aluminum shell body 110. Alternatively, the injection hole 1121 can also be disposed on the bottom wall 112 of the aluminum shell body 110, and the bottom wall 112 is disposed on the side of the aluminum shell body 110 away from the end cover 120.

[0075] When the aluminum shell body 110 is a cube, a cuboid or other prism structures, the injection hole 1121 can be set on the side wall 111 of the housing assembly 100 .

[0076] For example, the injection hole 1121 can be set at a position of the side wall 111 close to the end cover 120, the injection hole 1121 can also be set at a position of the side wall 111 close to the bottom wall 112, or the injection hole 1121 can be set in the middle of the injection hole 1121. The injection hole 1121 can maintain a certain distance from the edge of the side wall 111 to ensure the strength of the side wall 111, thereby ensuring the reliability of the battery cell. The example of this application does not limit the specific setting position of the injection hole 1121, as long as the injection hole 1121 is set on the side wall 111 of the aluminum shell body 110, and the setting position of the injection hole 1121 does not affect the use strength of the aluminum shell body 110.

[0077] When the aluminum shell body 110 is a cube, a cuboid or other prism structures, the injection hole may also be provided on the bottom wall of the aluminum shell body 110 .

[0078] For example, the injection hole can be close to the edge of the bottom wall, or the injection hole can be set in the middle of the bottom wall. In the case where the injection hole is close to the edge of the bottom wall, a certain distance needs to be maintained between the injection hole and the edge of the bottom wall to reduce the possibility of affecting the strength of the bottom wall due to the setting of the injection hole. The example of this application does not limit the specific setting position of the injection hole on the bottom wall, as long as the injection hole is set on the bottom wall of the aluminum shell body and the setting position of the injection hole does not affect the use strength of the aluminum shell body.

[0079] In the case where the aluminum shell body 110 is a cylindrical structure, the injection hole 1121 can also be set on the side wall 111 of the aluminum shell body 110 or the bottom wall 112 of the aluminum shell body 110. In this case, the side wall 111 of the aluminum shell body 110 is a curved surface. Compared with the case where the injection hole 1121 is set on the side wall 111 of the aluminum shell body 110, the case where the injection hole 1121 is set on the bottom wall 112 of the aluminum shell body 110 is set on a plane structure, so that the processing of the injection hole 1121 is relatively easy, and it is convenient for the injection equipment to inject electrolyte from the injection hole 1121.

[0080] Based on the above, the injection hole 1121 in the example of the present application can be provided on the side wall 111 or the bottom wall 112 of the aluminum shell body 110. In the case where the injection hole 1121 is provided on the side wall 111 of the aluminum shell body 110, if electrolyte leakage occurs, the electrolyte needs to flow from the injection hole 1121 at the side wall 111 through part of the side wall 111 and part of the end cover 120 to reach the pole 200. Compared with the prior art in which the injection hole 1121 and the pole 200 are both provided at the end cover 120, the flow path of the electrolyte can be extended, and the possibility of the electrolyte electrically connecting the aluminum shell body 110 and the pole 200 is reduced.

[0081] When the injection hole 1121 is arranged on the bottom wall 112 of the aluminum shell body 110, if electrolyte leakage occurs, the electrolyte needs to flow out from the injection hole 1121, flow through part of the bottom wall 112, the side wall 111 of the aluminum shell body 110 and part of the end cover 120 to reach the location of the pole 200. Compared with the prior art in which the injection hole 1121 and the pole 200 are both arranged on the end cover 120, the flow path of the electrolyte can be extended, reducing the possibility of the electrolyte electrically connecting the aluminum shell body 110 and the pole 200.

[0082] Based on the housing assembly 100 provided in the above example, in the case where the injection hole 1121 is provided on the bottom wall 112 , the geometric center of the injection hole 1121 may substantially coincide with the geometric center of the bottom wall 112 .

[0083] The geometric center of the injection hole 1121 substantially coincides with the geometric center of the bottom wall 112 , which means that the distance between the geometric center of the injection hole 1121 and the geometric center of the bottom wall 112 is less than or equal to 3 mm.

[0084] When the geometric center of the injection hole 1121 substantially coincides with the geometric center of the bottom wall 112 , the injection device can conveniently locate the injection hole 1121 and improve the injection efficiency if the size of the bottom wall 112 is known.

[0085] In addition, since the geometric center of the injection hole 1121 basically coincides with the geometric center of the bottom wall 112, the distance that the electrolyte entering the installation cavity from the injection hole 1121 reaches the side wall 111 on the same horizontal plane is basically the same, which facilitates the electrolyte to infiltrate the electrode in the installation cavity.

[0086] Based on the housing assembly 100 provided in the above example, Figure 4 A schematic diagram of the structure of a housing assembly from a second perspective provided in this application example, Figure 5 For along Figure 4 The cross-sectional view at AA in the middle. Figure 6 for Figure 5 Please refer to the enlarged schematic diagram of the part A in the middle. Figures 4 to 6 The injection hole 1121 may include a first sub-hole K1 and a second sub-hole K2 that are interconnected. The second sub-hole K2 may be disposed away from the installation cavity compared to the first sub-hole K1, and the size of the second sub-hole K2 may be larger than that of the first sub-hole K1.

[0087] The shape of the first sub-hole K1 and the shape of the second sub-hole K2 can be the same or different. The shapes of the first sub-hole K1 and the second sub-hole K2 are the same as the shape of the injection hole 1121 mentioned above, and the examples of this application are not repeated here.

[0088] The first sub-hole K1 and the second sub-hole K2 can cooperate to form a stepped hole, or the first sub-hole and the second sub-hole can cooperate to form a tapered hole. The example of the present application does not limit the specific arrangement of the first sub-hole K1 and the second sub-hole K2.

[0089] Based on the above, since the second sub-hole K2 is arranged away from the installation cavity compared to the first sub-hole K1, and the size of the second sub-hole K2 is larger than the size of the first sub-hole K1, therefore, when the liquid injection device extends into the liquid injection hole 1121 to inject electrolyte into the installation cavity, the liquid injection device first extends into the second sub-hole K2, that is, the liquid injection hole 1121 first extends into the larger end of the liquid injection hole 1121, which facilitates the liquid injection device to align with the liquid injection hole 1121, thereby improving the liquid injection efficiency.

[0090] Based on the housing assembly 100 provided in the above example, Figure 7 For an exploded schematic diagram of a battery cell provided as an example for this application, please refer to Figure 2 and Figure 7 , Figure 7 The sealing structure 130 includes the glue nail 131 and the sealing nail 132 for example. The housing assembly 100 may further include a sealing structure 130 , which is at least partially disposed through the injection hole 1121 and seals the injection hole 1121 .

[0091] The sealing structure 130 may include a glue nail 131 or a sealing steel ball, and the injection hole 1121 may be sealed by the glue nail 131 or the sealing steel column to reduce the possibility of electrolyte leaking from the injection hole 1121 to outside the installation cavity.

[0092] The sealing structure 130 may further include a sealing pin 132. The sealing pin 132 may be made of the same material as the aluminum shell body 110. The specific implementation of the sealing pin 132 is not limited in this example.

[0093] The sealing nail 132 can be arranged on the side of the glue nail 131 or the sealing steel ball away from the installation cavity, and the sealing nail 132 can be welded to the aluminum shell body 110 to further reduce the possibility of electrolyte leakage from the injection hole 1121.

[0094] When the injection hole 1121 includes a first sub-hole K1 and a second sub-hole K2, and the first sub-hole K1 and the second sub-hole K2 cooperate to form a stepped hole, there is a first connection surface at the connection between the first sub-hole K1 and the second sub-hole K2. The glue nail 131 can be inserted into the first sub-hole K1 to reduce the possibility of electrolyte leakage from the first sub-hole K1. The side of the sealing nail 132 facing the glue nail 131 can be fitted with the first connection surface, and the sealing nail 132 is welded to the bottom wall 112 of the aluminum shell body 110 to further improve the sealing performance at the injection hole 1121 and reduce the possibility of electrolyte leakage from the injection hole 1121.

[0095] In summary, by providing the sealing structure 130 , the injection hole 1121 can be sealed, thereby reducing the possibility of electrolyte leaking from the injection hole 1121 to the outside of the installation cavity, and further reducing the possibility of short circuit between the housing assembly 100 and the pole 200 .

[0096] Based on the housing assembly 100 provided in the above example, please refer to Figure 2 and Figure 7 The housing assembly 100 may further include an explosion-proof structure 140 , and the aluminum shell body 110 may further be provided with a mounting hole 1122 , the mounting hole 1122 being used to assemble the explosion-proof structure 140 , and the mounting hole 1122 is spaced apart from the injection hole 1121 .

[0097] In the case where the housing assembly 100 includes an aluminum shell body 110 , the explosion-proof structure 140 may be connected to the aluminum shell body 110 by post-welding to ensure the safety of the explosion-proof structure 140 .

[0098] In the case where the housing assembly includes a steel housing body, the explosion-proof structure can be punched on the steel housing body, specifically, can be punched on a thinner area of ​​the steel housing body. Next, the housing assembly 100 including the aluminum housing body 110 is described as an example.

[0099] The mounting hole 1122 may be circular, oval, or have other shapes.

[0100] The explosion-proof structure 140 can be connected to the mounting cavity through the mounting hole 1122. The explosion-proof structure 140 can be at least partially penetrated through the mounting hole 1122 and connected to the hole wall of the mounting hole 1122. Since the mounting hole 1122 is provided in the aluminum shell body 110, the explosion-proof structure 140 is connected to the aluminum shell body 110 through the hole wall of the mounting hole 1122.

[0101] When the gas pressure inside the installation cavity exceeds the preset pressure due to abnormal heating, short circuit or other reasons of the battery cell, the explosion-proof structure 140 can be automatically opened to release the high-pressure gas inside the battery cell, thereby reducing the possibility of the battery cell rupture or explosion due to excessive internal gas pressure. Through the pressure relief action of the explosion-proof structure 140, the working environment in the installation cavity can be made more stable, thereby extending the reliability and service life of the battery cell.

[0102] The explosion-proof structure 140 may only include an explosion-proof valve, a safety valve or other structures capable of relieving pressure, or may include a matching explosion-proof valve and a waterproof breathable membrane. When the explosion-proof structure 140 includes a waterproof breathable membrane, the battery cell can exchange gas with the external environment under normal working conditions while preventing water penetration, thereby reducing the possibility that the battery cell is affected by external humidity.

[0103] The mounting hole 1122 and the injection hole 1121 can be set on the side wall 111 of the aluminum shell body 110 at the same time, or can be set on the bottom wall 112 of the aluminum shell body 110 at the same time, or one of them can be set on the side wall 111 and the other can be set on the bottom wall 112. Alternatively, the mounting hole 1122 can also be set on the end cover 120. The example of this application does not limit the specific setting method of the mounting hole 1122, as long as the mounting hole 1122 and the injection hole 1121 are set at intervals, and the injection device will not interfere with the explosion-proof structure 140 during the injection operation.

[0104] The distance between the mounting hole 1122 and the side wall 111 is a first distance L1, and L1 may be greater than or equal to 3 mm to reduce the influence of the mounting hole 1122 on the strength of the aluminum shell body 110 and ensure the use strength of the aluminum shell body 110.

[0105] In summary, when the gas pressure in the battery cell installation cavity is high, the pressure relief action of the explosion-proof structure 140 can be used to make the working environment in the installation cavity more stable, thereby extending the reliability and service life of the battery cell.

[0106] By arranging the installation hole 1122 and the injection hole 1121 at intervals, the possibility of interference between the injection equipment and the explosion-proof structure 140 can be reduced during the injection operation, thereby reducing the possibility of damage to the explosion-proof structure 140.

[0107] Based on the housing assembly 100 provided in the above example, please refer to Figure 5 , the distance between the mounting hole 1122 and the injection hole 1121 can be greater than or equal to 5 mm.

[0108] The distance between the mounting hole 1122 and the injection hole 1121 is a second distance L2, and L2 may be greater than or equal to 5 mm.

[0109] By setting the distance between the mounting hole 1122 and the injection hole 1121 to be greater than or equal to 5 mm, the possibility of interference between the injection equipment and the explosion-proof structure 140 during the injection operation can be further reduced, thereby reducing the possibility of damage to the explosion-proof structure 140.

[0110] Based on the housing assembly 100 provided in the above example, Figure 8 for Figure 5 Please refer to the enlarged schematic diagram of the part B in the figure. Figure 5 and Figure 8 The mounting hole 1122 may include a third sub-hole K3 and a fourth sub-hole K4 that are interconnected. The fourth sub-hole K4 is disposed away from the end cover 120 compared to the third sub-hole K3, and the size of the fourth sub-hole K4 is larger than that of the third sub-hole K3.

[0111] The shape of the third sub-hole K3 and the shape of the fourth sub-hole K4 can be the same or different. The shapes of the third sub-hole K3 and the fourth sub-hole K4 are the same as the shape of the mounting hole 1122 mentioned above, and the present application example will not be repeated here.

[0112] The third sub-hole K3 and the fourth sub-hole K4 may be arranged in a stepped manner.

[0113] The shape of the third sub-hole K3 matches the shape of the explosion-proof structure 140 to ensure that after the explosion-proof structure 140 is matched with the third sub-hole K3, when the explosion-proof structure 140 is not working, the electrolyte cannot leak from the matching position of the explosion-proof structure 140 and the third sub-hole K3.

[0114] The third sub-hole K3 may also be a cylindrical hole, and the fourth sub-hole K4 may be a tapered hole.

[0115] The fourth sub-hole K4 may include a fixing hole K41 and a clearance hole K42 that are interlinked. The fixing hole K41 and the clearance hole K42 may have the same shape, and the fixing hole K41 and the clearance hole K42 may cooperate to form a cylindrical hole.

[0116] The sizes of the fixing hole K41 and the clearance hole K42 may also be different. For example, the fixing hole K41 and the clearance hole K42 may both be cylindrical, and the diameter of the clearance hole K42 may be larger than the diameter of the fixing hole K41. The fixing hole K41 may be cylindrical, and the clearance hole K42 may be a conical hole. The specific arrangement of the fourth sub-hole K4 is not limited in this example.

[0117] When the explosion-proof structure 140 is installed in the installation hole 1122, there is a second connection surface at the connection between the third sub-hole K3 and the fourth sub-hole K4, and the side of the explosion-proof structure 140 facing the installation cavity can be in contact with the second connection surface. The side of the explosion-proof structure 140 facing away from the installation cavity is located in the fourth sub-hole K4, or the explosion-proof structure 140 is flush with the side of the bottom wall 112 facing away from the installation cavity.

[0118] The size of the third sub-hole K3 may be smaller than the size of the explosion-proof structure 140 , and the size of the fourth sub-hole K4 may be larger than the size of the explosion-proof structure 140 .

[0119] In summary, since the fourth sub-hole K4 is arranged away from the installation cavity compared to the third sub-hole K3, and the size of the fourth sub-hole K4 is larger than the size of the third sub-hole K3, during the assembly process of the explosion-proof structure 140 and the installation hole 1122, the explosion-proof structure 140 first extends into the fourth sub-hole K4, that is, the explosion-proof structure 140 first extends into the larger end of the installation hole 1122, which facilitates improving the installation efficiency of the explosion-proof structure 140 and the aluminum shell body 110.

[0120] Finally, it should be noted that the above embodiments are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto, and any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A housing assembly, characterized in that: include: The aluminum shell body is provided with an installation cavity, and the installation cavity is used to install the electrolyte; An end cover is installed at one end of the aluminum shell body and seals the cavity opening of the installation cavity, and a pole is installed on the end cover; Wherein, the aluminum shell body is provided with a liquid injection hole, and the liquid injection hole and the pole are arranged in different planes.

2. The housing assembly according to claim 1, characterized in that: The injection hole is arranged on the side wall of the aluminum shell body; or, the injection hole is arranged on the bottom wall of the aluminum shell body, and the bottom wall is arranged on the side of the aluminum shell body away from the end cover.

3. The housing assembly according to claim 2, characterized in that: When the liquid injection hole is arranged on the bottom wall, the geometric center of the liquid injection hole substantially coincides with the geometric center of the bottom wall.

4. The housing assembly according to any one of claims 1 to 3, characterized in that: The injection hole includes a first sub-hole and a second sub-hole that are interconnected. The second sub-hole is arranged away from the installation cavity compared to the first sub-hole, and the size of the second sub-hole is larger than that of the first sub-hole.

5. The housing assembly according to claim 4, characterized in that: It also includes a sealing structure, which is at least partially disposed through the liquid injection hole and seals the liquid injection hole.

6. The housing assembly according to any one of claims 1 to 3, characterized in that: It also includes an explosion-proof structure. The aluminum shell body is also provided with a mounting hole, which is used to assemble the explosion-proof structure. The mounting hole is spaced apart from the injection hole.

7. The housing assembly according to claim 6, characterized in that: The distance between the mounting hole and the injection hole is greater than or equal to 5 mm.

8. The housing assembly according to claim 6, characterized in that: The mounting hole includes a third sub-hole and a fourth sub-hole which are interlinked with each other. The fourth sub-hole is arranged away from the end cover compared to the third sub-hole, and the size of the fourth sub-hole is larger than the size of the third sub-hole.

9. A battery cell, characterized in that: It comprises a pole, an electrolyte and a shell assembly as claimed in any one of claims 1 to 8, wherein the pole is installed in the shell assembly and the electrolyte is arranged in a mounting cavity of the shell assembly.

10. A battery, characterized in that: Comprising the battery cell as claimed in claim 9.

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