Battery cell

Abstract

The utility model discloses a battery monomer, which comprises a shell, a battery cell and a battery cell, the polar plate is a metal plate and is used for sealing and covering the opening; and the electrode assembly is arranged in the shell, the electrode assembly comprises a tab, and the tab is connected with the polar plate. According to the battery monomer disclosed by the utility model, the polar plate is arranged as a metal piece and is connected with the tab, so that the polar plate can be used as a flow guide component to input or output current to the battery monomer, and therefore, the use of other parts can be reduced, and the production cost and the overall weight of the battery monomer can be further reduced; the light weight of the battery monomer is realized; meanwhile, the polar plate is used as a flow guide part, so that the flow area can be increased, the flow guide amount can be further increased, the single battery has smaller internal resistance and discharge temperature rise, and the operation reliability of the single battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery monomer. Background Art

[0002] In recent years, with the strong support of the country for the new energy industry, lithium-ion battery technology has developed rapidly. Lithium-ion batteries have the advantages of high energy density and long cycle life. They are the fastest-growing and most promising secondary batteries in recent years. They have been widely used in smart phones, tablets, digital cameras, electric toys, electronic navigation devices, etc. In recent years, lithium-ion batteries have also been widely used in new energy vehicles, communication base stations, military, aerospace and other fields. Although lithium-ion battery technology has developed rapidly, there are still deficiencies in the manufacturing cost and performance of traditional pole covers. For example, in the prior art, the battery cover mainly adopts a riveted cover, which has many sub-components, high cost, and heavy weight, which reduces the assembly efficiency of the battery and increases the overall cost of the battery. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a battery cell, which can reduce the production cost of the battery, achieve the lightweight of the battery, and increase the operating reliability of the battery.

[0004] The battery cell according to the utility model comprises: a shell having an opening; a pole plate which is a metal plate and is used to cover the opening; and an electrode assembly which is arranged in the shell and comprises a pole ear which is connected to the pole plate.

[0005] According to the battery cell of the utility model, by setting the pole plate as a metal part and connecting the pole plate with the pole ear, the pole plate can be used as a flow guide component to input or output current to the battery cell. In this way, the use of other components can be reduced, thereby reducing the production cost and overall weight of the battery cell, thereby achieving lightweight battery cells. At the same time, by using the pole plate as a flow guide component, the flow area can be increased, thereby increasing the flow conduction amount, so that the battery cell has a smaller internal resistance and discharge temperature rise, thereby increasing the operating reliability of the battery cell.

[0006] According to some embodiments of the present invention, the electrode plate includes an electrode plate body and a boss, and the boss is arranged on a side surface of the electrode plate body facing away from the electrode assembly.

[0007] According to some embodiments of the present invention, a first groove is formed on the electrode body, and the boss is installed in the first groove.

[0008] According to some embodiments of the present utility model, a raised matching portion is provided on the outer peripheral surface of the boss, and the matching portion is installed in the first groove.

[0009] According to some embodiments of the present utility model, a through hole is formed on the electrode plate body and penetrates the electrode plate body along the thickness direction of the electrode plate body, and the boss is installed in the through hole.

[0010] According to some embodiments of the present utility model, a connecting portion is formed on the boss, and the connecting portion is installed in the through hole.

[0011] According to some embodiments of the present utility model, the pole plate is a stamped part, a boss is constructed on the pole plate, and the boss is located on a side of the pole plate away from the electrode assembly.

[0012] According to some embodiments of the present invention, in the width direction of the electrode plate, the distance between the boss and the edge of the electrode plate body is greater than or equal to 1 mm.

[0013] According to some embodiments of the present invention, a cavity is formed inside the boss.

[0014] According to some embodiments of the present invention, an explosion-proof valve installation hole and / or a liquid injection hole are formed on the pole plate.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a partial schematic diagram of a battery cell according to an embodiment of the utility model;

[0017] Figure 2 is along Figure 1 A cross-sectional view of the line AA shown in FIG.

[0018] Figure 3 is a schematic diagram of a plate according to an embodiment of the utility model;

[0019] Figure 4 yes Figure 3 A schematic diagram of another angle of the electrode plate shown in ;

[0020] Figure 5 is along Figure 4 A cross-sectional view of line BB shown in FIG.

[0021] Figure 6 is a schematic diagram of a plate according to another embodiment of the utility model;

[0022] Figure 7 yes Figure 6 A schematic diagram of another angle of the electrode plate shown in ;

[0023] Figure 8 yes Figure 6 A schematic diagram of another angle of the electrode plate shown in ;

[0024] Fig. 9 yes Figure 6 A schematic diagram of another angle of the electrode plate shown in ;

[0025] Fig.10 yes Figure 6 Schematic diagrams of other angles of the electrode plate shown in ;

[0026] Fig.11 is along Fig.10 A cross-sectional view of the CC line shown in FIG.

[0027] Fig.12 is a schematic diagram of a plate according to another embodiment of the utility model;

[0028] Fig.13 yes Fig.12 A schematic diagram of another angle of the electrode plate shown in ;

[0029] Fig.14 yes Fig.12 A schematic diagram of another angle of the electrode plate shown in ;

[0030] Fig.15 is along Fig.14 A cross-sectional view of line DD is shown in FIG.

[0031] Reference numerals:

[0032] 100. Battery cell;

[0033] 10. Plates;

[0034] 1. Plate body; 11. First groove; 12. Through hole;

[0035] 2. boss; 21. mating portion; 22. connecting portion; 23. cavity;

[0036] 20. Explosion-proof valve. DETAILED DESCRIPTION

[0037] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0038] Reference below Figure 1-Figure 15A battery cell 100 according to an embodiment of the present invention is described.

[0039] The battery cell 100 according to the embodiment of the utility model comprises: a shell, a pole plate 10 and an electrode assembly, wherein the shell has an opening; the pole plate 10 is a metal plate used to cover the opening; the electrode assembly is arranged in the shell, and the electrode assembly comprises a pole ear connected to the pole plate 10.

[0040] Specifically, the housing is mainly used to isolate the inside of the battery cell 100 from the outside, effectively preventing the inside of the battery cell 100 from communicating with the outside, thereby improving the reliability of the battery cell 100. The electrode plate 10 is mainly used to cover the open side of the electrode plate 10 to seal the internal environment of the battery cell 100 and ensure the safety of the battery cell 100. The electrode assembly is the core component of the battery, mainly used to store and release energy.

[0041] Among them, the electrode plate 10 is a metal part and is connected to the electrode ear. It can be understood that the electrode plate 10 can be used as a guide component to guide the current from the battery cell 100 or introduce the current into the battery cell 100, so that the battery cell 100 can be charged or discharged.

[0042] It should be noted that the tabs generally include positive tabs and negative tabs, wherein the plate 10 connected to the positive tab is the positive plate, and the plate 10 connected to the negative tab is the negative plate, and the positive plate and the negative plate are respectively arranged on opposite sides of the shell.

[0043] For the convenience of description, the embodiments of the present invention will not distinguish between the positive and negative electrodes of the tabs and plates 10. The tabs and plates 10 involved in the embodiments of the present invention and their related descriptions can be applied to the structures of positive tabs, negative tabs, positive plates and negative plates.

[0044] It should be further explained that, when the electrode plate 10 is a positive electrode plate, an insulating member may or may not be provided between the shell and the electrode plate 10. When the electrode plate 10 is a negative electrode plate, an insulating member is provided between the shell and the electrode plate 10 to achieve insulation between the negative electrode plate and the shell, avoid the risk of short circuit of the battery cell 100, and ensure the safety of the battery cell 100.

[0045] Furthermore, the electrode plate 10 may be directly connected to an external electrical connection sheet, wherein the electrical connection sheet is used to connect two adjacent battery cells 100 to achieve series connection between the battery cells 100 .

[0046] According to the battery cell 100 of the embodiment of the utility model, by setting the pole plate 10 as a metal part and connecting the pole plate 10 with the pole ear, the pole plate 10 can be used as a flow guide component to input or output current to the battery cell 100. In this way, the use of other components can be reduced, and the production cost and overall weight of the battery cell 100 can be reduced, thereby achieving lightweight battery cell 100; at the same time, using the pole plate 10 as a flow guide component can also increase the flow area, thereby increasing the flow conduction amount, so that the battery cell 100 has a smaller internal resistance and discharge temperature rise, and the operating reliability of the battery cell 100 is increased.

[0047] According to some embodiments of the present invention, Figure 3-Figure 15 As shown, the plate 10 includes a plate body 1 and a boss 2, wherein the boss 2 is disposed on a side surface of the plate body 1 away from the electrode assembly. The plate body 1 can be used to connect the pole lug, and the boss 2 can be used to connect the external electrical connection sheet, so that the connection position of the pole lug and the electrical connection sheet can be limited, thereby increasing the convenience and reliability of the assembly of the battery cell 100; at the same time, welding is usually used to connect the plate body 1 and the pole lug, and the boss 2 and the external electrical connection sheet, thereby effectively preventing the problem of reduced welding quality caused by the connection of two welding molten pools, thereby improving the welding quality of the pole lug and the electrical connection sheet with the plate 10, thereby improving the electrical connection stability of the battery cell 100.

[0048] According to some embodiments of the present invention, Figure 3-Figure 5 As shown, a first groove 11 is formed on the plate body 1, and the boss 2 is installed in the first groove 11. The first groove 11 can limit the installation position of the boss 2, thereby increasing the assembly convenience of the plate 10 and improving the assembly speed of the plate 10.

[0049] According to some embodiments of the present invention, Figure 3-Figure 5 As shown, a protruding mating portion 21 is provided on the outer peripheral surface of the boss 2, and the mating portion 21 is installed in the first groove 11. In this way, the contact area between the boss 2 and the plate body 1 can be increased, thereby increasing the connection stability between the boss 2 and the plate body 1; at the same time, the connection convenience between the boss 2 and the plate body 1 can be increased, which is conducive to improving the production rate of the plate 10.

[0050] Furthermore, the boss 2 is welded to the plate body 1 , and the weld width between the boss 2 and the plate body 1 is greater than or equal to 0.8 mm, and the weld depth is greater than or equal to 0.3 mm. In this way, the connection strength between the boss 2 and the plate body 1 can be ensured, and the sealing of the plate 10 can be improved.

[0051] According to some embodiments of the present invention, Figure 7-Figure 11As shown, a through hole 12 is formed on the plate body 1 and penetrates the plate body 1 along the thickness direction of the plate body 1, and the boss 2 is installed in the through hole 12. The through hole 12 can limit the installation position of the boss 2, thereby increasing the assembly convenience of the plate 10, and at the same time, further reducing the weight of the plate body 1, thereby reducing the overall weight of the plate 10, and further reducing the overall weight of the battery cell 100, thereby achieving lightweight battery cell 100.

[0052] According to some embodiments of the present invention, Figure 8-Figure 9 As shown, a connection portion 22 is formed on the boss 2, and the connection portion 22 is installed in the through hole 12. Among them, the boss 2 is mainly used to connect the external electrical connection sheet, and the connection portion 22 is used to be fixedly connected to the plate body 1. In this way, when the boss 2 and the plate body 1 are welded, the occurrence of the molten pool being connected during the welding process can be further reduced, thereby improving the electrical connection stability of the battery cell 100.

[0053] According to some embodiments of the present invention, Figure 11-Figure 15 As shown, the plate 10 is a stamped part, and a boss 2 is constructed on the plate 10. The boss 2 is located on the side of the plate 10 away from the electrode assembly. Among them, stamping is a forming method that uses a press and a die to apply external force to plates, strips, pipes and profiles to cause plastic deformation or separation, thereby obtaining a workpiece (stamped part) of a desired shape and size. The process is relatively simple. Therefore, the plate 10 is a stamped part, which can reduce the difficulty of producing the plate 10, improve the production efficiency of the plate 10, and reduce the production cost of the plate 10.

[0054] According to some embodiments of the present invention, Fig.14 As shown, in the width direction of the electrode 10, the distance between the boss 2 and the edge of the electrode body 1 is greater than or equal to 1 mm. In this way, when an external insulating member is required to be sleeved on the boss 2, the external insulating member can be prevented from exceeding the edge of the electrode body 1, thereby improving the appearance of the battery cell 100. At the same time, when the boss 2 is connected to the electrode body 1 by welding, the distance between the boss 2 and the edge of the electrode body 1 is greater than or equal to 1 mm, which provides operating space for the welding process, thereby reducing the difficulty of welding and ensuring the welding quality of the boss 2 and the electrode body.

[0055] For example, the distance H between the boss 2 and the edge of the electrode body 1 may be 1 mm, 2 mm, 3 mm or more.

[0056] According to some embodiments of the present invention, a cavity 23 is formed inside the boss 2. In this way, the overall weight of the boss 2 can be reduced, and the overall weight of the electrode plate 10 can be reduced, so that the battery cell 100 can be made lighter.

[0057] According to some embodiments of the utility model, an explosion-proof valve installation hole and / or a liquid injection hole are formed on the pole plate 10. It is understandable that the pole plate 10 may be formed with an explosion-proof valve installation hole, a liquid injection hole, or both. Specifically, the liquid injection hole is mainly used to inject electrolyte into the battery cell 100 so that the chemical reaction inside the battery cell 100 can proceed; the explosion-proof valve installation hole is used to install the explosion-proof valve 20, wherein the explosion-proof valve 20 is mainly used to ensure the safe operation of the battery cell 100. When the battery cell 100 has thermal runaway, high-temperature substances can be discharged through the explosion-proof valve 20 to reduce the internal pressure of the battery cell 100, thereby preventing the battery cell 100 from causing the battery shell to rupture or explode due to excessive internal pressure.

[0058] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0059] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0060] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0062] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that: include: a housing having an opening; A plate, which is a metal plate and is used to cover the opening; The electrode assembly is arranged in the shell, and the electrode assembly includes a pole ear, and the pole ear is connected to the pole plate.

2. The battery cell according to claim 1, characterized in that: The electrode plate comprises an electrode plate body and a boss, wherein the boss is arranged on a side surface of the electrode plate body away from the electrode assembly.

3. The battery cell according to claim 2, characterized in that: A first groove is formed on the pole plate body, and the boss is installed in the first groove.

4. The battery cell according to claim 3, characterized in that: A protruding matching portion is provided on the outer peripheral surface of the boss, and the matching portion is installed in the first groove.

5. The battery cell according to claim 2, characterized in that: A through hole is formed on the electrode plate body and penetrates the electrode plate body along the thickness direction of the electrode plate body, and the boss is installed in the through hole.

6. The battery cell according to claim 5, characterized in that: A connecting portion is formed on the boss, and the connecting portion is installed in the through hole.

7. The battery cell according to claim 1, characterized in that: The pole plate is a stamped part, and a boss is constructed on the pole plate. The boss is located on a side of the pole plate away from the electrode assembly.

8. The battery cell according to any one of claims 2 to 7, characterized in that: In the width direction of the electrode plate, the distance between the boss and the edge of the electrode plate body is greater than or equal to 1 mm.

9. The battery cell according to any one of claims 2 to 6, characterized in that: A cavity is formed inside the boss.

10. The battery cell according to any one of claims 1 to 7, characterized in that: The pole plate is formed with an explosion-proof valve installation hole and / or a liquid injection hole.

Images