Battery

Abstract

The utility model relates to the field of electric energy storage, in particular to a battery, which comprises a shell and a battery cell arranged in the shell, the battery cell comprises a positive plate and a negative plate, a first current collector and a second current collector are respectively and conductively connected with the positive plate and the negative plate, the first current collector is further conductively connected with the shell, and a terminal is arranged in a hole structure arranged on the shell in a penetrating manner. The terminal is conductively connected with the second current collector, the terminal is provided with an outer flange located on the outer side of the shell and an inner flange located on the inner side of the shell, and the insulation isolation structure comprises an outer insulation part clamped between the outer flange and the shell and an inner insulation part clamped between the inner flange and the shell; each of the outer insulation part and the inner insulation part comprises an insulation substrate, an insulation supporting piece is embedded in the insulation substrate covered by the outer flange and the inner flange, the melting point of the insulation supporting piece is greater than that of the insulation substrate, and even if the insulation substrate is melted, the insulation supporting piece still plays an insulation supporting role to prevent short circuit.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of electric energy storage, and particularly relates to a battery. BACKGROUND

[0002] With the development of new energy technology, more and more devices will use batteries, and common batteries include cylindrical batteries, rectangular batteries, soft package batteries, etc. Taking cylindrical batteries as an example, the cylindrical batteries include a shell and a winding core arranged in an inner cavity of the shell, the winding core is wound by a positive plate, a negative plate, and an insulating separator arranged between the positive plate and the negative plate, and the shell further includes a positive current collector and a negative current collector.

[0003] One of the positive current collector and the negative current collector is in conductive connection with the shell, and the other is in conductive connection with a terminal extending out of the shell, and the shell and the terminal respectively constitute two electrodes of the battery. In order to prevent short circuit, an insulating separator is arranged between the shell and the terminal to prevent the terminal from contacting the shell, and the insulating separator is generally made of soft insulating material and has a relatively low melting point. In the case of an accident of the battery, high temperature is generated, in which case, the conventional insulating separator is melted, resulting in contact and short circuit of the terminal and the shell, and further aggravating the accident. SUMMARY

[0004] The utility model provides a kind of battery, to solve the technical problem that the battery in prior art is short-circuited due to the melting of the insulating separator between the positive electrode and the negative electrode when high temperature is generated accidentally.

[0005] The utility model provides a kind of battery.

[0006] A battery includes:

[0007] A shell;

[0008] An electrode core arranged in the shell includes a positive plate and a negative plate;

[0009] A first current collector and a second current collector are arranged in the shell, one of the first current collector and the second current collector is in conductive connection with the positive plate, and the other is in conductive connection with the negative plate, and the first current collector is further in conductive connection with the shell;

[0010] A terminal is arranged in a hole structure of the shell and is in conductive connection with the second current collector, and the terminal has an outer flange located outside the shell and an inner flange located inside the shell;

[0011] And an insulating isolation structure, comprising an outer insulating part sandwiched between the outer flange and the outer shell, and an inner insulating part sandwiched between the inner flange and the outer shell, the outer insulating part and the inner insulating part each comprising an insulating base body, the insulating support being embedded in the insulating base body of the outer flange and the inner flange gland, the melting point of the insulating support being greater than the melting point of the insulating base body.

[0012] In one technical solution, along the direction of the outer flange and the inner flange are arranged at intervals, both ends of the insulating support are exposed from the insulating base body and are in contact with the terminal and the outer shell respectively.

[0013] In one technical solution, along the direction of the outer flange and the inner flange are arranged at intervals, the outer insulating part and the inner insulating part are two parts of the body.

[0014] In one technical solution, the battery further comprises a sealing ring between the outer insulating part and the inner insulating part, the sealing ring being arranged between the terminal and the outer shell.

[0015] In one technical solution, the sealing ring comprises a cylindrical annular part between the inner wall of the hole structure and the terminal, and a sheet-shaped annular part press-fitted between the upper flange and the outer shell.

[0016] In one technical solution, the sheet-shaped annular part is in contact with the outer insulating part, and the cylindrical annular part is in contact with the inner insulating part.

[0017] In one technical solution, the material of the insulating support is ceramic.

[0018] In one technical solution, the insulating support is distributed at intervals around the terminal.

[0019] In one technical solution, the insulating support is one of a cylindrical shape, a polygonal column shape, and a spherical shape.

[0020] In one technical solution, the battery further comprises a gasket between the inner flange and the inner insulating part, the end surface area of the gasket being greater than the end surface area of the inner flange towards the inner insulating part, and the terminal being a rivet.

[0021] The beneficial effects of the utility model are as follows:

[0022] The terminal and the shell of the battery respectively constitute two electrodes of the battery, the insulation isolation structure is arranged between the terminal and the shell for insulation isolation, the terminal and the shell are prevented from being in conductive contact and short circuit, the insulation support is arranged in the insulation base body of the outer insulation part and the insulation base body of the inner insulation part, and the melting point of the insulation support is greater than that of the insulation base body, so that even if the battery suddenly generates high temperature and melts the insulation base body, the insulation support is still arranged between the terminal and the shell for insulation isolation, the terminal is prevented from being in contact with the shell and short circuit, and the further deterioration of the accident is prevented. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a partial structure sectional view of an embodiment of the battery in the utility model;

[0024] Figure 2 It is Figure 1 It is a partial enlarged view of A in the utility model;

[0025] Figure 3 It is a top view of an embodiment of the battery in the utility model;

[0026] Figure 4 It is a sectional view of the outer insulation gasket in an embodiment of the battery in the utility model;

[0027] Figure 5 It is a structure schematic view of the outer insulation gasket in an embodiment of the battery in the utility model;

[0028] Figure 6 It is a structure sectional view of another embodiment of the battery in the utility model.

[0029] 100, shell; 200, battery core; 300, positive current collector; 400, positive terminal insulation sheet;

[0030] 500, terminal; 501, outer flange; 502, inner flange;

[0031] 601, outer insulation gasket; 6011, high polymer insulation material ring; 6012, ceramic support column; 602, inner insulation gasket;

[0032] 700, sealing ring; 800, gasket. DETAILED DESCRIPTION

[0033] The application will be described in further detail below with specific reference to the drawings. Like elements in different embodiments are denoted by like reference numerals. In the following description, numerous specific details are described to provide a thorough understanding of the application. However, those skilled in the art will recognize that the application can be practiced without these specific details. In other instances, well-known structures have not been described in detail in order to avoid obscuring the application. Those skilled in the art will also recognize that some implementation of the application can incorporate techniques of the application without necessarily being aware of all the implications of those techniques.

[0034] In addition, the features described in the specification, operations or characteristics can be combined in any appropriate manner to form various embodiments, and the operation steps involved in each embodiment can be sequentially adjusted or adjusted in a manner that can be easily apparent to those skilled in the art. Therefore, the specification and drawings are only intended to clearly describe one embodiment, and do not mean that the composition and / or order is necessary.

[0035] The serial numbers of the components in this paper, such as "first", "second", etc., are only used to distinguish the described objects, and do not have any order or technical meaning. The "connection" and "coupling" in this application include direct and indirect connections (couplings) unless otherwise specified.

[0036] In the utility model, the shell and the terminal of the battery respectively constitute two electrodes of the battery, and an insulating isolation structure is arranged between the two electrodes. In particular, for the part pressed between the outer flange of the terminal and the shell and the part pressed between the inner flange of the terminal and the shell, the insulating isolation structure includes an insulating base body and an insulating support embedded in the insulating base body, and the insulating support is a structural member with a melting point higher than that of the insulating base body. In this way, when the battery suddenly overheats, even if the insulating base body melts, the insulating support will still insulate between the terminal and the shell, ensuring that the terminal and the shell will not be in contact and short-circuit, and preventing the battery from further overheating.

[0037] One embodiment of the battery in the utility model:

[0038] Please refer to Figure 1 and Figure 2, the battery includes a shell 100, an inner cavity of the shell 100 is provided with a battery cell 200, in an embodiment, the battery is a cylindrical lithium ion battery, naturally, the shell 100 is cylindrical, the material can be steel or any other suitable material, the battery cell 200 is a wound battery cell, the wound battery cell 200 includes a positive plate and a negative plate, and an insulating separator clamped between the positive plate and the negative plate. The structure of the battery cell 200 belongs to the prior art and will not be described here. In other embodiments, the battery can also be other forms of batteries, such as rectangular or other shapes.

[0039] The battery further includes a first current collector and a second current collector arranged in the shell 100 for current concentration, in an embodiment, please refer to Figure 1 , the first current collector is a positive current collector 300, and the second current collector is a negative current collector (not shown in the figure), the positive current collector 300 is in conductive connection with the positive plate, and the negative current collector is in conductive connection with the negative plate. A positive terminal insulating sheet 400 is further arranged between the positive current collector 300 and the bottom of the shell 100, which plays an insulating isolation role between the positive current collector 300 and the shell 100. In other embodiments, the first current collector can be a negative current collector, and the second current collector can be a positive current collector.

[0040] A hole structure penetrating through the bottom of the shell 100 is formed at the center of the bottom of the shell 100, and the battery further includes a terminal 500 penetrating through the hole structure, the terminal 500 is in conductive connection with the positive current collector 300, constituting a positive electrode of the battery, and the shell 100 is in conductive connection with the negative current collector, constituting a negative electrode of the battery. In other embodiments, the shell 100 can be in conductive connection with the positive current collector to constitute the positive electrode of the battery, and the terminal 500 can be in conductive connection with the negative current collector to constitute the negative electrode of the battery.

[0041] Please refer to Figure 1 and Figure 2 , the terminal 500 has an outer flange 501 and an inner flange 502, the maximum size of the outer flange 501 and the inner flange 502 is greater than the hole diameter of the hole structure. In an embodiment, the hole structure is a circular hole, and the outer flange 501 and the inner flange 502 are both circular flanges. In order to prevent the terminal 500 as the positive electrode from contacting and short-circuiting with the shell 100 as the negative electrode, an insulating isolation structure is further arranged between the shell 100 and the terminal 500.

[0042] Please refer to Figure 1 and Figure 2 , in an embodiment, the insulating isolation structure includes an outer insulating portion and an inner insulating portion, the outer insulating portion is clamped between the shell 100 and the outer flange 501, specifically clamped between the outer wall surface of the shell 100 and the outer flange 501, and the inner insulating portion is clamped between the shell 100 and the inner flange 502, specifically clamped between the inner wall surface of the shell 100 and the inner flange 502.

[0043] The outer insulation part comprises an insulation base, and an insulation support is embedded in the part of the insulation base that is pressed by the outer flange 501 and the outer shell 100. Similarly, the outer insulation part comprises an insulation base, and an insulation support is also embedded in the part of the insulation base that is pressed by the inner flange 502 and the outer shell 100. The melting point of the insulation support is higher than that of the insulation base. In this way, even if the battery is heated in a sudden situation and the insulation base melts, the insulation support remains to provide insulation support between the outer shell 100 and the terminal 500, preventing the outer shell 100 and the terminal 500 from being in contact and short-circuiting. The material of the insulation base can be one or a mixture of several of PVC (polyvinyl chloride), PET (polyethylene terephthalate), PC (polycarbonate), nylon, silica gel, PE (polyethylene), etc. The material of the insulation support can be one or a mixture of several of SiC (silicon carbide) ceramic material, AlN (aluminum nitride), bakelite (phenolic plastic), etc.

[0044] In one embodiment, along the direction in which the outer flange 501 and the inner flange 502 are arranged at intervals inside and outside, the height of the insulation support is the same as that of the insulation base, so that both ends of the insulation support are exposed from the insulation base. Here, exposure means that the insulation support can be directly seen from the outside, and the end of the insulation support is flush with the end surface of the insulation base. In other embodiments, the end of the insulation support can also slightly protrude from the insulation base, and the end surface of the insulation support can also be recessed in the insulation base. In this case, the insulation base has an opening to enable the insulation support to be directly seen from the outside. In this way, after assembly is completed, the terminal and the outer shell clamp the deformed insulation base and directly contact both ends of the insulation support.

[0045] Of course, in some other embodiments, the insulation support can be embedded in the insulation base, i.e., the insulation support is fully covered by the insulation base. In this case, the part of the insulation base corresponding to the end of the insulation support can have a relatively thin thickness. In this way, after the insulation isolation structure is clamped between the outer shell 100 and the terminal 500, the distance between the end of the insulation support and the outer shell 100 and the terminal 500 is as small as possible. In a high-temperature situation, after the insulation base melts, based on the clamping state of the insulation isolation structure by the outer shell 100 and the terminal 500, the insulation support can still be clamped between the outer shell 100 and the terminal 500 through slight deformation and contraction of the outer shell 100 and the terminal 500.

[0046] In one embodiment, please refer to Figure 1 and Figure 2, the outer insulation part and the inner insulation part of the insulation isolation structure are two separate parts, so as to facilitate the installation of the insulation isolation structure. The outer insulation part is specifically an outer insulation gasket 601, and the inner insulation part is an inner insulation gasket 602. Both the outer insulation gasket 601 and the inner insulation gasket 602 are sheet-shaped annular gasket structures, and have the same shape structure but different sizes. Please refer to Figure 1 、 Figure 2 and Figure 3 ( Figure 3 Other structures on the terminal are not shown), the outer diameter of the outer insulation gasket 601 is greater than the outer diameter of the outer flange 501. Please refer to Figure 1 and Figure 2 , the outer diameter of the inner insulation gasket 602 is greater than the outer diameter of the inner flange 502. In other embodiments, the insulation isolation structure can be a one-piece structure. The part of the one-piece insulation isolation structure located at one end of the outer side of the shell is the outer insulation part, and the part located at one end of the inner side of the shell is the inner insulation part. In other embodiments, please refer to Figure 6 , the outer insulation gasket can also have an upturned edge to wrap the outer peripheral surface of the outer flange.

[0047] Taking the outer insulation gasket 501 as an example, please refer to Figure 4 and Figure 5 , the insulation base is a high-molecular insulating material ring 6011, and the insulation support member is a ceramic support column 6012 embedded in the high-molecular insulating material ring 6011. The ceramic support column 6012 is specifically a cylindrical structure, and three are uniformly and spacedly distributed around the center of the high-molecular insulating material ring 6011. In other embodiments, the number of insulation support members can also be more than three, such as four or more, or less than three, such as two. In other embodiments, the insulation support member can also be one of a spherical shape, a polygonal column shape, etc. Of course, the insulation support member can also be a ring structure.

[0048] In one embodiment, please refer to Figure 1 and Figure 2The battery further comprises a sealing ring 700 arranged along the direction between the outer flange 501 and the inner flange 502, the sealing ring 700 is located between the outer insulation part and the inner insulation part, is sleeved on the terminal 500, and is pressed between the terminal 500 and the shell 100 to achieve sealing. Specifically, the sealing ring 700 comprises a cylindrical annular part located between the inner wall of the hole structure and the terminal 500, and a sheet annular part pressed between the outer flange 501 and the shell 100, and the two parts are in an integrated structure. In other embodiments, the sealing ring can only comprise the cylindrical annular part or only comprise the sheet annular part. For the arrangement of the sealing ring, when the insulation isolation structure is in an integrated structure, the sealing ring can also be sleeved outside the outer insulation part and be pressed between the outer flange 501 and the shell 100. The material of the sealing ring can be one or a mixture of several of fluororubber, nitrile rubber, silicone rubber, polyurethane, polypropylene, silica gel foam and nylon.

[0049] In an embodiment, referring to Figure 1 and Figure 2 , the sheet annular part of the sealing ring 700 is in contact with the outer insulation part, and the cylindrical annular part is in contact with the inner insulation part, so that after assembly is completed, the sealing ring 700 is deformed by being pressed and is in close contact with the insulation isolation structure, thereby avoiding the formation of a cavity that affects the sealing performance.

[0050] In an embodiment, referring to Figure 1 and Figure 2 , the terminal 500 is specifically a rivet, the head end of the rivet is located inside the shell 100, and the inner flange 502 is formed by deformation of the head end. The battery further comprises a gasket 800 located between the inner flange 502 and the inner insulation gasket 602, the gasket 800 is a rivet reinforcing gasket, and is in the shape of a circular ring gasket. The end surface area of the gasket 800 is greater than the end surface area of the inner flange 502 facing the inner insulation part, so that the inner flange 502 indirectly presses the inner insulation gasket 602 through the gasket 800, increases the pressing area of the inner insulation gasket 602, and spreads the riveting force to most of the area of the inner insulation gasket 602. In some other embodiments, the gasket 800 can also not be arranged, in which case the inner flange 502 directly presses the inner insulation gasket 602.

[0051] Based on the above structure, in the battery in the utility model, if a sudden situation occurs during work and the insulation base body melts, there is still an insulation support part between the terminal and the shell to provide insulation support, thereby preventing the terminal and the shell from being in contact and short-circuiting. At the same time, when the temperature is high enough to melt the insulation base body, the sealing ring generally also melts, at which time the gaps between the insulation support parts distributed around the terminal form a pressure relief channel, so that the high pressure inside the battery can be released, thereby reducing the risk of explosion of the battery.

[0052] The utility model is described above with specific examples, which is only used for helping to understand the utility model and does not limit the utility model. For the skilled in the art to which the utility model belongs, according to the idea of the utility model, a number of simple deductions, deformations or substitutions can be made.

Claims

1. A battery, characterized by, The battery comprises: a shell; a cell disposed in the shell, comprising a positive electrode sheet and a negative electrode sheet; a first current collector and a second current collector disposed in the shell, one of the first current collector and the second current collector being in electrically conductive connection with the positive electrode sheet, and the other being in electrically conductive connection with the negative electrode sheet, the first current collector being in electrically conductive connection with the shell; a terminal disposed in a hole structure of the shell, in electrically conductive connection with the second current collector, the terminal having an outer flange outside the shell and an inner flange inside the shell; and an insulating isolation structure comprising an outer insulating portion clamped between the outer flange and the shell, and an inner insulating portion clamped between the inner flange and the shell, the outer insulating portion and the inner insulating portion each comprising an insulating base, the insulating base being embedded with an insulating support, the melting point of the insulating support being greater than the melting point of the insulating base.

2. The battery of claim 1, wherein, In a direction along which the outer flange and the inner flange are spaced apart, both ends of the insulating support are exposed from the insulating base and are in contact with the terminal and the shell, respectively.

3. The battery of claim 1 or 2, wherein In the direction along which the outer flange and the inner flange are spaced apart, the outer insulating portion and the inner insulating portion are two separate parts.

4. The battery of claim 3, wherein the cathode is a lithium cobalt oxide cathode. The battery further comprises a sealing ring between the outer insulating portion and the inner insulating portion, the sealing ring being disposed between the terminal and the shell.

5. The battery of claim 4, wherein the cathode is a lithium cobalt oxide cathode. The sealing ring comprises a cylindrical annular portion between the inner wall of the hole structure and the terminal, and a sheet-shaped annular portion press-fitted between the outer flange and the shell.

6. The battery of claim 5, wherein the electrolyte is a mixture of LiPF6 and LiBF4. The sheet-shaped annular portion is in contact with the outer insulating portion, and the cylindrical annular portion is in contact with the inner insulating portion.

7. The battery of claim 1 or 2, wherein the cathode comprises a lithium metal oxide. The insulating support is made of ceramic.

8. The battery of claim 1 or 2, wherein the electrolyte comprises a lithium salt. The insulating supports are spaced apart around the terminal.

9. The battery of claim 8, wherein the cathode is a lithium cobalt oxide cathode. The insulating support is one of a cylinder, a polygonal column, and a sphere.

10. The battery of claim 1 or 2, wherein The battery further comprises a gasket between the inner flange and the inner insulating portion, the end surface area of the gasket being greater than the end surface area of the inner flange facing the inner insulating portion, and the terminal being a rivet.

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