Battery case and battery assembly

Abstract

The utility model discloses battery shell and battery assembly belong to battery technical field, and the present battery shell process difficulty big etc. are designed to solve the problem. The utility model discloses battery shell includes: shell main part is the tubular structure of two ends opening or the bucket -shaped structure of one end opening, and the end opening end of shell main part forms has the mounting through -hole, and the pole post subassembly including pole post, the annular connecting piece made of metal and set up between pole post and connecting piece's thermal compound spare, and pole post passes and is equipped in the through -hole of connecting piece middle part, and thermal compound spare is made of the material of melting point in the material of setting temperature range, and pole post subassembly is fixedly connected to shell main part through connecting piece, and pole post is located in the mounting through -hole. The utility model discloses battery shell and battery assembly, and pole post subassembly is fixedly connected to shell main part through connecting piece after the whole processing, and the problem of directly carrying out thermal compound on the shell in the prior art and leading to the process difficulty big, the cost is high, is solved, and processing is convenient.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to battery casing and battery assembly. Background Technology

[0002] The steel-cased battery mainly consists of a casing and a core. The casing includes a barrel structure made of steel sheet stamped into an open-end or open-end structure. The terminal post passes through a through hole from one side of the barrel structure, and a metal sheet is set on the other side of the through hole. The metal sheet is riveted to the terminal post. Insulating glue is applied between the through hole of the metal sheet and the terminal post, and between the metal sheet and the through hole of the casing, to achieve electrical insulation. The core is encapsulated in the above structure. One pole of the core is connected to the terminal post, and the other pole is connected to the casing. Then, the battery is assembled by welding a metal cover plate, liquid injection, formation and other processes.

[0003] Given that using rivets to connect the metal sheet and the terminal post would take up a lot of space and be detrimental to capacity improvement, some existing battery casings use PP adhesive to isolate the terminal post and the metal sheet and perform thermal bonding to achieve electrical insulation and sealing.

[0004] The shortcomings of existing thermally composite battery casings include: thermally composited directly on the casing with a barrel structure requires passivation of the surface of each thermally composited part of the casing, which is difficult and costly; if the casing is heated uniformly as a whole before thermally composited, the heating area is large, the process is complex, it is difficult to guarantee reliability, and the manufacturing cost is high. Utility Model Content

[0005] The purpose of this invention is to propose a battery casing and battery assembly, which solves the problem of high manufacturing difficulty of existing battery casings and facilitates processing.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A battery casing includes: a casing body, which is a cylindrical structure open at both ends or a barrel-shaped structure open at one end, wherein a mounting through hole is formed at one end of the casing body; and an electrode assembly, including an electrode, an annular connector made of metal, and a thermal composite member disposed between the electrode and the connector, wherein the electrode passes through a through hole in the middle of the connector, and the thermal composite member is made of a material with a melting point within a set temperature range, the electrode assembly is fixedly connected to the casing body through the connector, and the electrode is located in the mounting through hole.

[0008] In one preferred embodiment, the pole and the thermal composite are located outside the outer shell body, the connector is a flat plate structure, one side of the connector is connected to the outer wall surface of the outer shell body, and the opposite side of the connector is connected to the surface of the thermal composite facing the interior of the outer shell body.

[0009] In one preferred embodiment, the pole and the thermal composite are located inside the outer shell body, the connector has a stepped structure, one side of the connector is connected to the inner wall surface of the outer shell body, and the opposite side of the connector is connected to the surface of the thermal composite facing the outside of the outer shell body; one side and the opposite side of the connector are located on different steps.

[0010] In one preferred embodiment, the pole and the thermal composite are located inside the housing body, the connector is a flat plate structure, one side of the connector is connected to the inner wall of the housing body, and the other side of the connector is connected to the surface of the thermal composite facing the outside of the housing body.

[0011] In one preferred embodiment, the pole is located inside the outer shell body, the connector is a flat plate structure, the surface of the thermal composite facing the outside of the outer shell body is on the same horizontal plane as the outer wall surface of the outer shell body, and the connector connects the thermal composite and the outer shell body from the outside.

[0012] In one preferred embodiment, the pole is located outside the outer shell body, the connector is a flat plate structure, the surface of the thermal composite facing the inside of the outer shell body is on the same horizontal plane as the inner wall surface of the outer shell body, and the connector connects the thermal composite and the outer shell body from the inside.

[0013] In one preferred embodiment, the connector has a circular, elliptical, or rectangular through hole in the middle, and the cross section of the pole perpendicular to the axis is correspondingly circular, elliptical, or rectangular.

[0014] In one preferred embodiment, the housing body includes a positive terminal and a negative terminal, and the terminal assembly is connected to the positive terminal and / or the negative terminal.

[0015] In one preferred embodiment, the connector is fixedly connected to the outer shell body by laser welding.

[0016] On the other hand, the present invention adopts the following technical solution:

[0017] A battery assembly, including battery cells, and the battery assembly further including the aforementioned battery casing, wherein the battery cells are disposed within the battery casing.

[0018] The battery casing disclosed in this utility model has its terminal assembly processed as a whole and then fixedly connected to the casing body by connectors. This solves the problem of high process difficulty and high cost caused by direct thermal bonding on the casing in the prior art. It is easy to process, has high finished product quality, simple and reasonable process, low processing difficulty, and low processing cost.

[0019] The battery assembly disclosed in this utility model includes the aforementioned battery casing. A thermal composite component is provided between the terminal post and the connector, which improves the energy density and reduces the space wasted. The terminal post assembly is processed first, and then the entire terminal post assembly is fixedly connected to the casing body, which reduces the manufacturing difficulty, lowers the processing cost, and improves the reliability. Attached Figure Description

[0020] Figure 1 This is one of the structural schematic diagrams of the battery casing provided in a specific embodiment of this utility model;

[0021] Figure 2 This is the second structural schematic diagram of the battery casing provided in a specific embodiment of this utility model;

[0022] Figure 3 This is a schematic diagram of the first connection structure between the outer shell body and the pole post assembly provided in a specific embodiment of this utility model;

[0023] Figure 4 This is a schematic diagram of the second connection structure between the outer shell body and the pole post assembly provided in a specific embodiment of this utility model;

[0024] Figure 5 This is a schematic diagram of a third connection structure between the outer shell body and the pole post assembly provided in a specific embodiment of this utility model;

[0025] Figure 6 This is a schematic diagram of the fourth connection structure between the outer shell body and the pole post assembly provided in a specific embodiment of this utility model;

[0026] Figure 7 This is a schematic diagram of the fifth connection structure between the outer shell body and the pole assembly provided in a specific embodiment of this utility model.

[0027] In the picture:

[0028] 1. Outer shell; 2. Pole post; 3. Connector; 4. Thermal composite part; 11. Mounting through hole. Detailed Implementation

[0029] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0030] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0034] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0035] This embodiment discloses a battery casing and a battery assembly including the battery casing. The battery assembly also includes battery cells disposed within the battery casing. Figure 1 and Figure 2 As shown, the battery casing includes a casing body 1 and a terminal assembly. The casing body 1 is a cylindrical structure with open ends or a barrel structure with open end. A mounting through hole 11 is formed at the end of the casing body 1. The terminal assembly includes a terminal 2, an annular connector 3 made of metal, and a thermal composite 4 disposed between the terminal 2 and the connector 3. The terminal 2 passes through the through hole in the middle of the connector 3. The thermal composite 4 is made of a material with a melting point within a set temperature range.

[0036] After the entire pole assembly is processed, it is fixedly connected to the outer shell body 1 through the connector 3. The pole 2 is located in the mounting through hole 11. This solves the problem of high process difficulty and high cost caused by direct thermal bonding on the outer shell in the existing technology. It is easy to process, has high finished product quality, simple and reasonable process, low processing difficulty and low processing cost.

[0037] The battery assembly has a thermal composite component 4 between the terminal post 2 and the connector 3, which improves the energy density and reduces the space wasted. The terminal post assembly is processed first, and then the entire terminal post assembly is fixedly connected to the outer shell body 1, which reduces the manufacturing difficulty, lowers the processing cost, and improves the reliability.

[0038] The melting point temperature range of the material used to prepare the thermal composite 4 is not limited, as long as it can achieve thermal bonding between the electrode post 2 and the connector 3. In this embodiment, the temperature range is between 100°C and 140°C. That is, the material used to prepare the thermal composite 4 is a low-temperature hot melt adhesive that melts at 100°C to 140°C. When an external short circuit or other conditions cause the electrode post 2 to overheat, the temperature will exceed 100°C to 140°C, causing the thermal composite 4 to melt, thereby releasing gas and pressure and improving the safety of the battery assembly.

[0039] The specific material used to prepare the thermally bonded component 4 is not limited, as long as it can melt within a set temperature range. In this embodiment, the material used to prepare the thermally bonded component 4 can be, but is not limited to, PP (polypropylene) adhesive, which is a mature product, inexpensive, and easy to use.

[0040] The specific shape of the through hole in the middle of the connector 3 is not limited. In this embodiment, the through hole is circular, elliptical, or rectangular. Correspondingly, the cross-section of the pole post 2 perpendicular to the axis is circular, elliptical, or rectangular, as long as the pole post 2 can pass through the through hole of the connector 3.

[0041] The specific method by which the pole assembly is fixedly connected to the outer shell 1 is not limited. In this embodiment, the connector 3 is fixedly connected to the outer shell 1 by laser welding. The connection structure is firm and stable and the processing efficiency is high.

[0042] Based on the above structure, the outer casing 1 includes a positive terminal and a negative terminal. In order to improve the pressure relief safety of the battery assembly, the terminal assembly is connected to the positive terminal and / or the negative terminal, which has a wide range of applications and can adapt to various usage needs.

[0043] The specific connection structure between the outer casing 1 and the electrode assembly is not limited, as long as the electrode assembly is fully manufactured before being fixedly connected to the outer casing 1. In this embodiment, for example... Figure 3 As shown, the first connection structure is as follows: the pole post 2 and the thermal composite component 4 are located outside the outer shell body 1, and the connector 3 is a flat plate structure. The bottom surface of the connector 3 is connected to the outer wall surface of the outer shell body 1, and the top surface of the connector 3 is connected to the bottom surface of the thermal composite component 4 (the surface facing the inside of the outer shell body 1). The installation method is simple and efficient, and the requirements for the dimensional accuracy of the connector 3 and the dimensional accuracy of the mounting through hole 11 are not high. No further processing of the connector 3 is required, resulting in high processing efficiency, less material usage, and low cost.

[0044] like Figure 4 As shown, the second connection structure is as follows: the terminal post 2 and the thermal composite 4 are located inside the outer casing 1, and the connector 3 has a stepped structure. One side of the connector 3 is connected to the inner wall of the outer casing 1, and the opposite side of the connector 3 is connected to the surface of the thermal composite 4 facing the outside of the outer casing 1. One side and the opposite side of the connector 3 are located on different steps. In this embodiment, the outer half-circle of the connector 3 is lower than the inner half-circle, and the outer half-circle is located inside the outer casing 1. The top surface of the outer half-circle is connected to the inner wall of the outer casing 1. The top surface of the inner half-circle of the connector 3 is flush with the outer wall of the outer casing 1, and the bottom surface of the inner half-circle is connected to the thermal composite 4. This structure reduces the external space occupied by the outer casing 1 while striving to increase the internal space of the outer casing 1, avoids contact with devices around the battery assembly, has high space utilization, and is more aesthetically pleasing.

[0045] like Figure 5As shown, the third connection structure is as follows: the terminal post 2 and the thermal composite component 4 are located inside the outer casing 1, and the connector 3 is a flat plate structure. The top surface of the connector 3 is connected to the inner wall surface of the outer casing 1, and the bottom surface of the connector 3 is connected to the surface of the thermal composite component 4 facing the outside of the outer casing 1. No further processing of the connector 3 is required, resulting in higher processing and assembly efficiency; it also reduces the outward bulge volume of the terminal post assembly relative to the outer casing 1, avoiding contact with devices around the battery assembly and making it safer to use.

[0046] like Figure 6 As shown, the fourth connection structure is as follows: the pole post 2 is located inside the outer shell 1, the connector 3 is a flat plate structure, and the surface of the thermal composite component 4 facing the outside of the outer shell 1 is on the same horizontal plane as the outer wall surface of the outer shell 1. The connector 3 connects the thermal composite component 4 and the outer shell 1 from the outside. That is, the bottom surface of the connector 3 is connected to both the outer wall surface of the outer shell 1 and the top surface of the thermal composite component 4, which is convenient to assemble and has high assembly efficiency.

[0047] like Figure 7 As shown, the fifth connection structure is as follows: the pole post 2 is located outside the outer shell body 1, the connector 3 is a flat plate structure, the bottom surface of the thermal composite component 4 (the surface facing the inside of the outer shell body 1) is on the same horizontal plane as the inner wall surface of the outer shell body 1, and the connector 3 connects the thermal composite component 4 and the outer shell body 1 from the inside. That is, the top surface of the connector 3 connects the inner wall surface of the outer shell body 1 and the bottom surface of the thermal composite component 4 at the same time, which is convenient for assembly and the overall structure is firm and stable.

[0048] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A battery casing, characterized in that, include: The outer casing (1) is a cylindrical structure open at both ends or a barrel-shaped structure open at one end, and a mounting through hole (11) is formed at one end of the outer casing (1); and, The pole assembly includes a pole (2), an annular connector (3) made of metal, and a thermal composite (4) disposed between the pole (2) and the connector (3). The pole (2) passes through a through hole in the middle of the connector (3). The thermal composite (4) is made of a material with a melting point within a set temperature range. The pole assembly is fixedly connected to the housing body (1) through the connector (3). The pole (2) is located in the mounting through hole (11).

2. The battery casing according to claim 1, characterized in that, The pole post (2) and the thermal composite (4) are located outside the outer shell body (1). The connector (3) is a flat plate structure. One side of the connector (3) is connected to the outer wall surface of the outer shell body (1), and the other side of the connector (3) is connected to the surface of the thermal composite (4) facing the inside of the outer shell body (1).

3. The battery casing according to claim 1, characterized in that, The pole post (2) and the thermal composite (4) are located inside the outer shell body (1). The connector (3) has a stepped structure. One side of the connector (3) is connected to the inner wall of the outer shell body (1), and the other side of the connector (3) is connected to the surface of the thermal composite (4) facing the outside of the outer shell body (1). One side and the other side of the connector (3) are located on different steps.

4. The battery casing according to claim 1, characterized in that, The pole post (2) and the thermal composite (4) are located inside the outer shell body (1). The connector (3) is a flat plate structure. One side of the connector (3) is connected to the inner wall surface of the outer shell body (1), and the other side of the connector (3) is connected to the surface of the thermal composite (4) facing the outside of the outer shell body (1).

5. The battery casing according to claim 1, characterized in that, The pole post (2) is located inside the outer shell body (1), the connector (3) is a flat plate structure, the surface of the thermal composite (4) facing the outside of the outer shell body (1) is on the same horizontal plane as the outer wall surface of the outer shell body (1), and the connector (3) connects the thermal composite (4) and the outer shell body (1) from the outside.

6. The battery casing according to claim 1, characterized in that, The pole post (2) is located outside the outer shell body (1), the connector (3) is a flat plate structure, the surface of the thermal composite (4) facing the inside of the outer shell body (1) is on the same horizontal plane as the inner wall surface of the outer shell body (1), and the connector (3) connects the thermal composite (4) and the outer shell body (1) from the inside.

7. The battery casing according to any one of claims 1 to 6, characterized in that, The connector (3) has a circular, elliptical or rectangular through hole in the middle, and the cross section of the pole (2) perpendicular to the axis is correspondingly circular, elliptical or rectangular.

8. The battery casing according to any one of claims 1 to 6, characterized in that, The outer casing (1) includes a positive terminal and a negative terminal, and the pole assembly is connected to the positive terminal and / or the negative terminal.

9. The battery casing according to any one of claims 1 to 6, characterized in that, The connector (3) is fixedly connected to the outer shell body (1) by laser welding.

10. A battery assembly, including battery cells, characterized in that, The battery assembly further includes a battery housing as described in any one of claims 1 to 9, wherein the battery cell is disposed in the battery housing.

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