Positive electrode terminal assembly for battery cell top cover and battery cell top cover assembly

Abstract

The utility model belongs to the technical field of energy storage devices, and particularly relates to a positive electrode terminal assembly for a battery cell top cover and a battery cell top cover assembly comprising the positive electrode terminal assembly. Comprising an insulating part, a battery cell positive pole and a sealing part, according to the positive electrode terminal assembly for the battery cell top cover, the number of parts in the assembly is small, the structure of a cell cover plate assembly is simplified, the space utilization rate of a lithium cell is improved, and the energy density of the cell is further improved; and due to the reduction of parts and interfaces, failure points are effectively reduced, so that the yield of the battery cell is improved, the failure probability of the battery cell is reduced, and the reliability of a battery system is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of energy storage devices, and in particular relates to a positive electrode terminal assembly for a battery cell top cover, and a battery cell top cover assembly comprising the electrode terminal assembly. Background Art

[0002] New energy battery structural parts are continuously iterating, including the battery cell top cover and shell, which are the core components to protect the safety of lithium batteries. They play the role of supporting, protecting and transmitting energy. They need to have high dimensional accuracy, high surface quality, high performance requirements and other characteristics. They play the role of transmitting energy, carrying electrolyte, protecting safety, fixing and supporting batteries, etc., and according to different application environments, they have specific functions such as connectivity, shock resistance, heat dissipation, corrosion resistance, anti-interference, and antistatic properties.

[0003] The top cover of a lithium battery is a complex and sophisticated structure that is responsible for energy transmission and explosion-proof pressure relief. It is composed of more than 10 components. The existing top cover structure mainly consists of a cover plate, positive and negative poles, a liquid injection hole, a flip plate, an explosion-proof plate (valve), and other structures. For example, the top cover assembly of a secondary battery disclosed in Chinese patent document CN109817853A has a complex and sophisticated structure, with numerous parts and interfaces. This leads to many failure points in the overall battery cell, low yield, high production cost, and short top cover life. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a highly integrated positive electrode terminal assembly for a battery cell top cover, and a battery cell top cover assembly including the electrode terminal assembly, so as to solve the technical problems that the existing top cover structure has too many components, resulting in low yield and short top cover life.

[0005] In order to achieve the above purpose, the solutions adopted by the present invention are as follows:

[0006] In a first aspect, the present invention provides a positive electrode terminal assembly for a battery cell top cover, which is arranged on an electrode lead-out hole of a cover plate, wherein the positive electrode terminal assembly for the battery cell top cover includes:

[0007] An insulating member, comprising a base and a boss located on the base, wherein the base is clamped on one side of the cover plate, the boss passes through the electrode lead-out hole of the cover plate and extends toward the other side of the cover plate, and the base and the boss have a stepped hole passing therethrough, wherein the large-sized hole of the stepped hole is located on one side of the boss;

[0008] A battery cell positive electrode column, comprising an integrally formed battery cell positive electrode column plate and a battery cell positive electrode column liner located on one side of the battery cell positive electrode column plate, wherein the battery cell positive electrode column plate covers the large-sized hole of the stepped hole of the insulating member, and the battery cell positive electrode column liner includes a press-riveted fixing portion passing through the stepped hole of the insulating member;

[0009] The sealing member is located in the annular space between the side wall of the inner lining of the positive electrode column of the battery cell and the inner wall of the step hole of the insulating member.

[0010] Preferably, the insulating member is made of plastic and is integrally injection-molded on the electrode lead-out hole of the cover plate.

[0011] Preferably, the material of the positive electrode column of the battery cell is selected from any one of silver, copper, gold, aluminum, nickel and iron, preferably aluminum.

[0012] In a second aspect, the present invention further provides a battery cell top cover assembly, comprising a cover plate provided with an electrode lead-out hole, and also comprising the positive electrode terminal assembly for the battery cell top cover as described above, which is installed in the electrode lead-out hole of the cover plate.

[0013] Preferably, a pressure relief hole and a liquid injection hole are further provided on the cover plate, and the liquid injection hole is located next to the pressure relief hole.

[0014] Preferably, the battery further comprises a pressure relief member installed in the pressure relief hole, for releasing the pressure inside the battery when the internal pressure or temperature of the battery reaches a threshold value.

[0015] Preferably, the pressure relief component includes an explosion-proof disc covering the pressure relief hole of the cover plate and a dust-proof cover plate covering the explosion-proof disc.

[0016] Preferably, it also includes a core positioning block, which is located on the side of the cover plate facing the core, and the top of the battery core rests on the core positioning block; the core positioning block is two plastic parts, which are respectively arranged on one side of the electrode lead-out hole of the cover plate and at the pressure relief hole, and are integrally injection-molded on the cover plate with the insulating part in the positive electrode terminal assembly for the battery cell top cover.

[0017] Beneficial effects

[0018] The positive electrode terminal assembly for the battery cell top cover provided by the utility model has fewer parts in the assembly, simplifies the structure of the battery cell cover assembly, improves the space utilization rate of the lithium battery cell, and further improves the energy density of the battery cell; due to the reduction in parts and interfaces, the failure points are effectively reduced, thereby improving the yield rate of the battery cell, reducing the probability of battery cell failure, and ensuring the reliability of the battery system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1It is a schematic diagram of the three-dimensional structure of the battery cell top cover assembly involved in the present utility model.

[0020] Figure 2 This is a schematic diagram of the three-dimensional disassembled structure of the battery cell top cover assembly involved in the present utility model.

[0021] Figure 3 for Figure 1 Schematic diagram of the three-dimensional structure of the back side of the assembled battery cell top cover assembly before riveting.

[0022] Figure 4 for Figure 1 Schematic diagram of the three-dimensional structure of the back side of the assembled battery cell top cover assembly after riveting.

[0023] Figure 5 for Figure 1 Schematic diagram of the planar structure of the back side of the assembled battery cell top cover assembly before riveting.

[0024] Figure 6 for Figure 1 Schematic diagram of the planar structure of the back side of the assembled battery cell top cover assembly after riveting.

[0025] Figure 7 This is a cross-sectional view of the battery cell top cover assembly after assembly.

[0026] Figure 8 The utility model is a structural schematic diagram of the cover plate in the positive electrode terminal assembly used for the top cover of the battery cell.

[0027] Figure 9 The utility model is a structural schematic diagram of the insulating member in the positive electrode terminal assembly used for the battery cell top cover.

[0028] Figure 10 The utility model is a structural schematic diagram of a sealing member in a positive electrode terminal assembly for a battery cell top cover.

[0029] Figure 11 The utility model is a schematic structural diagram of the positive electrode column of the battery cell in the positive electrode terminal assembly used for the battery cell top cover.

[0030] Figure 12 The utility model is a structural schematic diagram of the explosion-proof plate of the battery cell top cover assembly.

[0031] Figure 13 The utility model is a schematic structural diagram of the dust cover of the battery cell top cover assembly.

[0032] In the figure,

[0033] 1-electrode terminal assembly, 11-insulating member, 111-base, 112-boss, 113-step hole, 12-battery cell positive column, 121-battery cell positive column plate, 122-battery cell positive column lining, 122a-pressure riveting fixing part, 13-sealing member,

[0034] 2-cover plate, 21-electrode lead hole, 22-pressure relief hole, 23-liquid injection hole,

[0035] 3-pressure relief piece, 31-explosion-proof disk, 32-dust cover,

[0036] 4-Core positioning block. DETAILED DESCRIPTION

[0037] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0039] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0040] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is typically placed when in use. These terms are intended solely to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0041] Furthermore, terms such as "horizontal" and "vertical" do not necessarily mean that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0042] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0043] To this end, the following solutions are proposed:

[0044] <Electrode Terminal Assembly>

[0045] See also Figure 1 、 Figure 2 The utility model provides a positive electrode terminal assembly 1 for a battery cell top cover, which is arranged on an electrode lead-out hole 21 of a cover plate 2, wherein the positive electrode terminal assembly 1 for a battery cell top cover includes: an insulating member 11, a battery cell positive electrode column 12 and a sealing member 13.

[0046] Specifically, combined Figure 1 、 Figure 2 、 Figure 7 and Figure 9 As shown, in a positive electrode terminal assembly 1 for a battery cell top cover provided by the present invention, the insulating member 11 is made of plastic and is integrally injection-molded on the electrode lead-out hole 21 of the cover plate 2, comprising a base 111 and a boss 112 located on the base 111, the base 111 being clamped on one side of the cover plate 2 (i.e. Figure 1 and Figure 2 The boss 112 passes through the electrode lead-out hole 21 of the cover plate 2 and extends to the other side of the cover plate 2 (i.e. Figure 1 and Figure 2 The base 111 and the boss 112 have a penetrating step hole 113 , and the large-sized hole of the step hole 113 is located on one side of the boss 112 .

[0047] Combine Figure 1 、 Figure 2 、 Figure 7 and Figure 11As shown, in a positive electrode terminal assembly 1 for a battery cell top cover provided by the utility model, the battery cell positive column 12 includes an integrally formed battery cell positive column plate 121 and a battery cell positive column lining 122 located on one side of the battery cell positive column plate 121, the battery cell positive column plate 121 covers the large-sized hole of the step hole 113 of the insulating member 11, and the battery cell positive column lining 122 includes a riveted fixing portion 122a passing through the step hole 113 of the insulating member 11.

[0048] In some embodiments, the material of the battery cell positive electrode column 12 is selected from any one of silver, copper, gold, aluminum, nickel and iron, preferably aluminum.

[0049] Combine Figure 1 、 Figure 2 、 Figure 7 and Figure 10 As shown, in a positive electrode terminal assembly 1 for a battery cell top cover provided by the utility model, the sealing member 13 is located in the annular space between the side wall of the battery cell positive electrode column lining 122 of the battery cell positive electrode column 12 and the inner wall of the step hole 113 of the insulating member 11, and is sleeved on the outer periphery of the battery cell positive electrode column lining 122 of the battery cell positive electrode column 12, and is used to seal the gap between the battery cell positive electrode column 12 and the insulating member 11, thereby ensuring the sealing of the battery cell top cover.

[0050] During the assembly process, first Figure 8 The electrode lead-out hole 21 is made on the cover plate 1 of the structure shown in the figure, and then the plastic part is integrally formed and injection-molded on the electrode lead-out hole 21. Figure 9 The insulating member 11 of the structure shown is formed by metal injection molding. Figure 11 The positive electrode column 12 of the battery cell with the structure shown in FIG. Figure 10 The seal 13 of the structure shown is sleeved on the outer periphery of the battery cell positive electrode column liner 122 of the battery cell positive electrode column 12, and then the battery cell positive electrode column 12 is Figure 2 The direction shown is covered in the step hole 113 of the insulating member 11, and the sealing member 13 located on the periphery of the inner liner 122 of the positive electrode column of the battery cell is fixed on the inner wall of the step hole 113 of the insulating member 11, and the press riveting fixing portion 122a of the inner liner 122 of the positive electrode column of the battery cell 12 extends out of the back side of the cover plate 1, forming a Figure 3 The back of the assembled battery cell top cover assembly is a schematic diagram of the three-dimensional structure before riveting. After the riveting fixing portion 122a of the battery cell positive electrode column liner 122 of the battery cell positive electrode column 12 is riveted and fixed, a structure as shown in FIG. Figure 4The diagram shows the three-dimensional structure of the back side of the assembled battery cell top cover assembly after riveting. During the riveting process, the riveted fixing portion 122a of the positive electrode column liner 122 of the positive electrode column 12 of the battery cell is squeezed toward the inner wall of the step hole 113 of the insulating member 11, and the sealing member 13 between the side wall of the positive electrode column liner 122 of the positive electrode column 12 of the battery cell and the inner wall of the step hole 113 of the insulating member 11 is further squeezed, thereby further improving the sealing between the positive electrode column 12 of the battery cell and the insulating member 11. Figure 5 and Figure 6 They are Figure 1 Schematic diagram of the planar structure of the components of the battery cell top cover assembly on the back side after assembly and before and after riveting.

[0051] The utility model provides a positive electrode terminal assembly for a battery cell top cover. Compared with the existing electrode terminal assembly, the assembly has fewer parts, simplifies the structure of the cell cover assembly, improves the space utilization rate of the lithium battery cell, and further improves the energy density of the battery cell. Due to the reduction in parts and interfaces, the failure points are effectively reduced, thereby improving the yield rate of the battery cell, reducing the probability of battery cell failure, and ensuring the reliability of the battery system.

[0052] <Battery cell top cover assembly>

[0053] See also Figure 1 、 Figure 2 The present invention further provides a battery cell top cover assembly, comprising a cover plate 2 and an electrode terminal assembly 1 , wherein the cover plate 2 is provided with an electrode lead-out hole 21 , and the electrode terminal assembly 1 is installed in the electrode lead-out hole 21 of the cover plate 2 .

[0054] In a battery cell top cover assembly provided by the present invention, a core positioning block 4 is further included. The core positioning block 4 is located on the side of the cover plate 2 facing the core, and the top of the battery core rests on the core positioning block 4 .

[0055] Specifically, the winding core positioning block 4 here is two plastic parts, which are respectively integrally injection molded on one side of the electrode lead-out hole 21 and the pressure relief hole 22 of the cover plate 2, and are integrally injection molded on the cover plate 2 with the insulating part 11 in the electrode terminal assembly 1.

[0056] Combine Figure 8 As shown, a pressure relief hole 22 and a liquid injection hole 23 are further provided on the cover plate 2, and a pressure relief member 3 is provided on the pressure relief hole 22. The pressure relief member 3 includes an explosion-proof plate 31 (as shown in FIG. Figure 12 As shown) and the dust cover 32 covering the explosion-proof disk 31 (as shown) Figure 13 shown).

[0057] <Battery Cells and Battery Packs>

[0058] According to the prior art, a battery cell used to form a battery pack for a new energy vehicle typically includes a top cover assembly, a shell, and an electrode assembly. In the present invention, the top cover assembly of the battery cell adopts the battery cell top cover assembly provided by the present invention. The electrode lead of the positive or negative electrode sheet in the electrode assembly is connected to the positive electrode column lining 122 of the positive electrode column 12 of the electrode terminal assembly 1 located on the electrode lead-out hole 21 of the cover plate 2 on the battery cell top cover assembly provided by the present invention. The positive electrode column plate 121 of the positive electrode column 12 of the electrode terminal assembly 1 on the battery cell top cover assembly provided by the present invention is connected to an external power source, thereby energizing the battery cell. During assembly or use, electrolyte can be injected (supplemented) through the injection hole 23 located on the cover plate 2 of the battery cell top cover assembly provided by the present invention.

[0059] In a battery cell top cover assembly provided by the present invention, the pressure relief member 3 located on the pressure relief hole 22 of the cover plate 2 is used to release the pressure inside the battery cell when the internal pressure or temperature of the battery cell reaches a threshold value. The explosion-proof plate 31 of the pressure relief member 3 can also be an explosion-proof valve, an air valve, a pressure relief valve or a safety valve, etc.

Claims

1. The positive electrode terminal assembly for the battery cell top cover is arranged on the electrode lead-out hole of the cover plate, characterized in that: The positive electrode terminal assembly for the battery cell top cover comprises: An insulating member, comprising a base and a boss located on the base, wherein the base is clamped on one side of the cover plate, the boss passes through the electrode lead-out hole of the cover plate and extends toward the other side of the cover plate, and the base and the boss have a stepped hole passing therethrough, wherein the large-sized hole of the stepped hole is located on one side of the boss; A battery cell positive electrode column, comprising an integrally formed battery cell positive electrode column plate and a battery cell positive electrode column liner located on one side of the battery cell positive electrode column plate, wherein the battery cell positive electrode column plate covers the large-sized hole of the stepped hole of the insulating member, and the battery cell positive electrode column liner includes a press-riveted fixing portion passing through the stepped hole of the insulating member; The sealing member is located in the annular space between the side wall of the inner lining of the positive electrode column of the battery cell and the inner wall of the step hole of the insulating member.

2. The positive electrode terminal assembly for a battery cell top cover according to claim 1, characterized in that: The insulating member is made of plastic and is integrally injection-molded on the electrode lead-out hole of the cover plate.

3. The positive electrode terminal assembly for a battery cell top cover according to claim 1, characterized in that: The material of the positive electrode column of the battery cell is selected from any one of silver, copper, gold, aluminum, nickel and iron.

4. A battery cell top cover assembly, comprising a cover plate provided with an electrode lead-out hole, characterized in that: It also includes a positive electrode terminal assembly for a battery cell top cover according to any one of claims 1 to 3, which is installed in the electrode lead-out hole of the cover plate.

5. The battery cell top cover assembly according to claim 4, characterized in that: A pressure relief hole and a liquid injection hole are also provided on the cover plate, and the liquid injection hole is located next to the pressure relief hole.

6. The battery cell top cover assembly according to claim 5, characterized in that: The invention also includes a pressure relief member installed in the pressure relief hole, for releasing the pressure inside the battery when the internal pressure or temperature of the battery reaches a threshold value.

7. The battery cell top cover assembly according to claim 6, characterized in that: The pressure relief component includes an explosion-proof disc covering the pressure relief hole of the cover plate and a dust-proof cover plate covering the explosion-proof disc.

8. The battery cell top cover assembly according to claim 7, characterized in that: It also includes a core positioning block, which is located on the side of the cover plate facing the core, and the top of the battery core rests on the core positioning block; the core positioning block is two plastic parts, which are respectively arranged on one side of the electrode lead-out hole of the cover plate and at the pressure relief hole, and are integrally injection-molded on the cover plate with the insulating part in the positive electrode terminal assembly for the battery cell top cover.

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