Battery cell output electrode structure and battery

Abstract

The utility model relates to the technical field of batteries, in particular to a battery cell output pole structure and a battery, and the battery cell output pole structure comprises a pole group which comprises a pole lug; the cover plate assembly is provided with a first mounting surface and a second mounting surface, the first mounting surface and the second mounting surface are arranged back to back, and the first mounting surface is arranged opposite to the pole group; the output pole is arranged on the cover plate assembly; the pole connecting piece is arranged on the first mounting surface, the tab is connected with the pole connecting piece, and the pole connecting piece is connected with the output pole. According to the battery cell output pole structure provided by the invention, the pole column connecting piece is designed, and the pole lug and the pole column connecting piece are directly welded, so that the connection of the pole lug and the output pole column is realized, the distributed welding of connecting sheets with the pole lug and the output pole column is canceled, and the process complexity of the assembly process of the battery cell output pole structure is reduced.

Description

Technical Field

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

[0002] As lithium-ion battery technology matures, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields, and the requirements for the performance and safety of lithium-ion batteries are increasing. Lithium cells are the core components of battery pack safety and assembly, and their structural design is crucial to cell safety.

[0003] The existing lithium battery cell cover plate adopts a multi-bundle electrode + connecting piece method to weld the pole ears. There are relatively many parts and processes. The positive and negative pole ears generally need to be bent in C or S shape, and the corresponding pole ears are longer, which leads to the risk of wrinkles and tears on the pole ears. Utility Model Content

[0004] The purpose of the present application is to provide a battery cell output pole structure and a battery, so as to solve to a certain extent the technical problem that the existing pole ear welding method in the prior art is prone to wrinkling and tearing of the pole ear.

[0005] The present application provides a battery cell output pole structure, comprising: a pole group, the pole group comprising a pole ear;

[0006] A cover plate assembly, the cover plate assembly having a first mounting surface and a second mounting surface, the first mounting surface and the second mounting surface are arranged back to back with each other, and the first mounting surface is arranged facing the pole group;

[0007] An output pole, wherein the output pole is arranged on the cover plate assembly;

[0008] A pole connector, wherein the pole connector is arranged on the first mounting surface, the pole lug is connected to the pole connector, and the pole connector is connected to the output pole.

[0009] In the above technical solution, further, the cover plate assembly includes:

[0010] A lower plastic part, the lower plastic part is in a strip shape, one side surface of the lower plastic part is the first mounting surface, and the side surface of the lower plastic part facing away from the first mounting surface is the second mounting surface; the lower plastic part is provided with a first mounting hole, and the pole connector is provided facing the first mounting hole;

[0011] The cover plate body is arranged on the second mounting surface, the cover plate body is provided with a second mounting hole, the second mounting hole is arranged facing the first mounting hole, and the output pole is penetrated through the first mounting hole and the second mounting hole.

[0012] In any of the above technical solutions, further, the pole connector includes:

[0013] a first connecting portion, the first mounting hole being provided with a mounting groove, the first connecting portion being arranged in the mounting groove;

[0014] a second connection portion, the second connection portion is connected to the first connection portion, and the second connection portion is arranged at an angle to the first connection portion;

[0015] The first connecting portion includes a first surface and a second surface disposed opposite to each other;

[0016] The second connecting portion includes a third surface and a fourth surface disposed opposite to each other;

[0017] The tab is connected to the third surface.

[0018] In any of the above technical solutions, further, the battery cell output electrode structure also includes:

[0019] A first insulating member, the first insulating member is disposed on the first surface, and the first insulating member separates the first connecting portion and the electrode tab;

[0020] A second insulating member is disposed on the fourth surface.

[0021] In any of the above technical solutions, further, the first connecting portion has a first predetermined thickness L1, wherein 1mm≤L1≤2.5mm; and / or the second connecting portion has a second predetermined thickness W, wherein 1mm≤W≤2.5mm.

[0022] In any of the above technical solutions, further, a support portion is provided at the end of the lower plastic part, the support portion has a first predetermined height H1, and the second connecting portion has a second predetermined height H2, wherein H1>H2, (H1-H2)>1mm.

[0023] In any of the above technical solutions, further, the battery cell output electrode structure also includes:

[0024] An upper plastic part, the upper plastic part is arranged on the cover body, and the upper plastic part is provided with a fixing groove;

[0025] A connecting piece is arranged in the fixing groove.

[0026] In any of the above technical solutions, further, the cover plate body is provided with a first limiting portion, and the upper plastic part is provided with a second limiting portion that can be adaptively connected with the first limiting portion.

[0027] In any of the above technical solutions, further, the battery cell output pole structure also includes a sealant, and the sealant is arranged between the output pole and the connector.

[0028] The present application also provides a battery, comprising the cell output electrode structure described in any of the above technical solutions, and thus having all the beneficial technical effects of the cell output electrode structure, which will not be repeated here.

[0029] Compared with the prior art, the beneficial effects of this application are:

[0030] The battery cell output pole structure provided in the present application includes: a pole group, the pole group includes a pole ear; a cover plate assembly, the cover plate assembly has a first mounting surface and a second mounting surface, the first mounting surface and the second mounting surface are arranged back to back to each other, and the first mounting surface is arranged facing the pole group; an output pole, the output pole is arranged on the cover plate assembly; a pole connector, the pole connector is arranged on the first mounting surface, the pole ear is connected to the pole connector, and the pole connector is connected to the output pole.

[0031] The output pole structure of the battery cell provided in the present application realizes the connection between the pole ear and the output pole by designing a pole connector and adopting direct welding between the pole ear and the pole connector, thereby eliminating the use of distributed welding of connecting pieces with the pole ear and the output pole respectively, thereby reducing the process complexity of the assembly process of the output pole structure of the battery cell, and at the same time, does not require the pole ear to be led out for a long length, which can effectively reduce the risk of wrinkles and tears on the pole ear.

[0032] The battery provided in the present application includes the battery cell output electrode structure described above. Therefore, the battery cell output electrode structure can improve the assembly efficiency and production efficiency of the battery, and can also reduce the risk of tab connection failure, thereby improving the safety of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 A schematic diagram of the structure of the output electrode of the battery cell provided in an embodiment of the present application;

[0035] Figure 2 for Figure 1 A schematic diagram of the enlarged structure at M;

[0036] Figure 3A schematic diagram of an exploded structure of a cell output electrode structure provided in an embodiment of the present application;

[0037] Figure 4 Another perspective view of the output electrode structure of the battery cell provided in an embodiment of the present application;

[0038] Figure 5 for Figure 4 Section view along AA;

[0039] Figure 6 for Figure 5 Enlarged schematic diagram at N;

[0040] Figure 7 for Figure 4 Sectional view along BB;

[0041] Figure 8 A partial structural schematic diagram of the battery cell output electrode structure provided in an embodiment of the present application.

[0042] Figure markings: 1-cover assembly, 101-lower plastic part, 1011-first mounting surface, 1012-second mounting surface, 1013-first mounting hole, 1015-mounting groove, 1016-first supporting portion, 1017-second supporting portion, 102-cover body, 1021-second mounting hole, 1022-first limiting portion, 2-output pole, 3-pole connector, 301-first connecting portion, 302-second connecting portion, 4-pole group, 5-pole ear, 6-first insulating member, 7-second insulating member, 8-upper plastic part, 801-first penetration hole, 802-second limiting portion, 9-connecting member, 901-second penetration hole, 10-sealing member. DETAILED DESCRIPTION

[0043] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0044] The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed, but merely represents the selected embodiments of the present application.

[0045] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0046] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0047] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0048] Refer to the following Figures 1 to 8 The cell output electrode structure and the battery described in the embodiments of the present application are described.

[0049] See also Figures 1 to 8 As shown, an embodiment of the present application provides a battery cell output pole structure, which includes a pole group 4, a cover plate assembly 1, an output pole 2 and a pole connector 3, wherein the pole group 4 has a pole ear 5, the cover plate assembly 1 is provided with a mounting portion for mounting the output pole 2, and the output pole 2 is arranged on the mounting portion; the cover plate assembly 1 has a first mounting surface 1011 and a second mounting surface 1012 arranged back to back to each other, the first mounting surface 1011 is arranged facing the pole group 4, and the pole connector 3 is arranged on the first mounting surface 1011, so that the pole ear 5 of the pole and the pole connector 3 can be connected on one side of the first mounting surface 1011, and the connection method can be but is not limited to welding; the output pole 2 and the pole connector 3 are connected, or the output pole 2 is arranged on the pole connector 3, so as to realize the pole ear 5, the pole connector 3 and the output pole 2 are connected in sequence, so that the output pole 2 can be connected to the outside.

[0050] Specifically, the cover plate assembly 1 includes a lower plastic part 101, which is in the shape of a long strip as a whole, and has a first mounting surface 1011 and a second mounting surface 1012 that are opposite to each other. When the output pole structure of the battery cell is in an assembled state, the first mounting surface 1011 is the lower surface of the lower plastic part 101, and the second mounting surface 1012 is the upper surface of the lower plastic part 101. The pole ear 5 is arranged on one side of the first mounting surface 1011 of the lower plastic part 101.

[0051] The cover assembly 1 further includes a cover body 102, which can be a common plain aluminum plate in the art, but is not limited thereto. The cover body 102 is disposed on the second mounting surface 1012 of the lower plastic part 101. The mounting portion includes a first mounting hole 1013 and a second mounting hole 1021, wherein the first mounting hole 1013 is disposed on the lower plastic part 101, and the second mounting hole 1021 is disposed on the cover body 102. Preferably, in this embodiment, the first mounting hole 1013 is a hole structure that passes through the first mounting surface 1011 and the second mounting surface 1012 of the lower plastic part 101, and the second mounting hole 1021 is a hole structure that passes through the large surfaces on both sides of the cover body 102, and the first mounting hole 1013 and the second mounting hole 1021 are coaxially arranged opposite to each other, so that the output pole 2 can be passed through the first mounting hole 1013 and the second mounting hole 1021, and the upper end of the output pole 2 can pass through the second mounting hole 1021 to the top of the cover body 102, and the lower end of the output pole 2 can pass through the first mounting hole 1013 to the first mounting surface 1011 and be flush with the first mounting surface 1011.

[0052] Further, the pole connector 3 includes a first connection part 301 and a second connection part 302, the first connection part 301 and the second connection part 302 are both in the shape of a plate or a sheet, the first connection part 301 and the second connection part 302 are arranged at an angle, one side of the second connection part 302 is connected to one side of the first connection part 301, and the first connection part 301 and the second connection part 302 preferably adopt a split structure, which can effectively reduce the processing cost, and is easy to adjust, and can realize a platform design. Preferably, the first connection part 301 and the second connection part 302 are arranged vertically, and more preferably, the first mounting surface 1011 of the lower plastic part 101 is provided with a mounting groove 1015, the shape of the mounting groove 1015 is adapted to the shape of the first connection part 301, the first connection part 301 can be stably arranged in the mounting groove 1015, and the first connection part 301 covers the first mounting hole 1013.

[0053] The second connection portion 302 is disposed on one side of the first connection portion 301 . The second connection portion 302 has a length extending along the length direction of the lower plastic part 101 and a height extending along the thickness direction of the first connection portion 301 .

[0054] Furthermore, the first connection part 301 has a first surface and a second surface with the largest area and arranged back to back, the first surface is in contact with the first mounting surface 1011 and covers the first mounting hole 1013, and the second surface is arranged facing the pole group 4. The second connection part 302 has a third surface and a fourth surface with the largest area and arranged back to back, wherein the third surface is arranged adjacent to the second surface. After the output pole structure of the battery cell is assembled in place, the lower plastic part 101 can block and limit the pole group 4, and the pole ear 5 is located between the second surface and the third surface, so that the pole ear 5 can be connected to the third surface, and the connection method can be but is not limited to welding.

[0055] As described above, the first surface of the first connection portion 301 is arranged opposite to the first mounting hole 1013, so that the bottom end of the output pole 2 passing through the first mounting hole 1013 and the second mounting hole 1021 can contact the first surface, which facilitates the connection and fixation of the output pole 2 with the first surface, so that the output pole 2 is connected to the first connection portion 301. Alternatively, the output pole 2 can be pre-determined on the first surface, and during assembly, the pole connector 3 and the output pole 2 are passed through the first mounting hole 1013 and the second mounting hole 1021 in sequence along the direction from the first mounting surface 1011 of the lower plastic part 101 toward the second mounting surface 1012, so that the output pole 2 can pass through the first mounting hole 1013 and the second mounting hole 1021, and the pole connector 3 remains on the first mounting surface 1011 of the lower plastic part 101.

[0056] Preferably, the first connection portion 301 has a first predetermined thickness L1, wherein 1 mm≤L1≤2.5 mm; and the second connection portion 302 has a second predetermined thickness W, wherein 1 mm≤W≤2.5 mm.

[0057] Furthermore, the lower plastic part 101 has two end portions distributed along its length direction, a first support portion 1016 is provided near one end of the first mounting surface 1011 of the lower plastic part 101, and a second support portion 1017 is provided near the other end of the second mounting surface 1012 of the lower plastic part 101, the height of the first support portion 1016 is the same as the height of the second support portion 1017, and the heights of the two support portions are both a first predetermined height H1; the second connecting portion 302 has a second predetermined height H2, in this embodiment, H1>H2, preferably, (H1-H2)>1mm, so that when the pole connector 3 is located in the mounting groove 1015, the side edge of the second connecting portion 302 away from the first connecting portion 301 is prevented from protruding relative to the support portion, thereby affecting the assembly of the lower plastic part 101.

[0058] Furthermore, the output pole structure of the battery cell further includes a first insulating member 6 and a second insulating member 7. The first insulating member 6 and the second insulating member 7 are both sheet-shaped insulating stickers, and the first insulating member 6 is arranged on the first surface. Preferably, the first insulating member 6 completely covers the first surface, so that the first insulating member 6 can form an insulating protection on the first surface, separating the pole ear 5 from the first surface, and even if the pole ear 5 contacts or overlaps with the first surface, there will be no conduction between the pole ear 5 and the first surface, ensuring that the pole ear 5 is only connected and fixed to the third surface.

[0059] The second insulating member 7 is arranged on the fourth surface. Preferably, the second insulating member 7 covers the fourth surface. The second insulating member 7 forms an insulating protective layer on the fourth surface to prevent the fourth surface from overlapping with other structures. By arranging the first insulating member 6 and the second insulating member 7, the current output through the pole ear 5 can be transmitted to the output pole 2 along the transmission path that passes through the second connecting part 302 and the first connecting part 301 in sequence.

[0060] Furthermore, the output pole structure of the battery cell also includes an upper plastic part 8 and a connecting part 9, wherein the upper plastic part 8 is arranged on a side surface of the cover body 102 away from the lower plastic part 101, and one side surface of the upper plastic part 8 is in contact with the cover body 102. A fixing groove is provided on the side surface of the upper plastic part 8 facing away from the cover body 102, and the connecting part 9 is arranged in the fixing groove. The upper plastic part 8 is provided with a first penetration hole 801, and the first penetration hole 801 is connected with the second mounting hole 1021 and the first mounting hole 1013. The connecting part 9 is provided with a second penetration hole 901, and the second penetration hole 901 is connected with the first penetration hole 801, so that the output pole 2 can be penetrated into the second penetration hole 901, so that the connecting part 9 can be connected to the output pole 2 as a whole, and the connection method can be but is not limited to riveting, so as to ensure the stability of the output pole 2.

[0061] Furthermore, the cover body 102 is provided with a first limiting portion 1022 , which is arranged on the side of the second mounting hole 1021 . Preferably, there are at least two first limiting portions 1022 , and all the first limiting portions 1022 are distributed at intervals along the circumference of the second mounting hole 1021 . A second limiting portion 802 is provided at a position of the upper plastic part 8 corresponding to the first limiting portion 1022. The shape of the second limiting portion 802 is adapted to the shape of the first limiting portion 1022. The number of the second limiting portions 802 is the same as the number of the first limiting portions 1022 and corresponds one to one, so that during the assembly process, each group of adapted first limiting portions 1022 and second limiting portions 802 can play a role in positioning and assembly, thereby improving the assembly accuracy of the upper plastic part 8 and the cover body 102. After the assembly is completed, each group of first limiting portions 1022 and second limiting portions 802 play a limiting role, thereby enabling the cover body 102 and the upper plastic part 8 to remain stable and reduce the risk of movement between the two.

[0062] Preferably, in this embodiment, the first limiting portion 1022 is a groove or a through hole provided on the cover body 102 , and the second limiting portion 802 is a protrusion of the upper plastic part 8 protruding toward the cover body 102 and capable of matching with the groove or the through hole.

[0063] Furthermore, the output pole structure of the battery cell also includes a seal 10, which is sleeved on the output pole 2. After the output pole 2 is connected to the connector 9, the seal 10 is located between the output pole 2 and the connector 9, so that the connector 9 and the output pole 2 have better sealing.

[0064] In summary, the battery cell output pole structure provided in the present application realizes the connection between the pole ear 5 and the output pole 2 by designing the pole connector 3 and directly welding the pole ear 5 with the pole connector 3, thereby eliminating the use of distributed welding of the connecting piece with the pole ear 5 and the output pole 2 respectively, thereby reducing the process complexity of the assembly process of the battery cell output pole structure, and at the same time, there is no need to lead out the pole ear 5 for a long length, which can effectively reduce the risk of wrinkles and tears in the pole ear 5.

[0065] An embodiment of the present application further provides a battery, comprising the cell output electrode structure described in any of the above embodiments, and thus having all the beneficial technical effects of the cell output electrode structure, which will not be described in detail herein.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cell output electrode structure, characterized in that: include: A pole group, the pole group including pole ears; A cover plate assembly, the cover plate assembly having a first mounting surface and a second mounting surface, the first mounting surface and the second mounting surface are arranged back to back with each other, and the first mounting surface is arranged facing the pole group; An output pole, wherein the output pole is arranged on the cover plate assembly; A pole connector, wherein the pole connector is arranged on the first mounting surface, the pole lug is connected to the pole connector, and the pole connector is connected to the output pole.

2. The cell output electrode structure according to claim 1, characterized in that: The cover plate assembly comprises: A lower plastic part, the lower plastic part is in a strip shape, one side surface of the lower plastic part is the first mounting surface, and the side surface of the lower plastic part facing away from the first mounting surface is the second mounting surface; the lower plastic part is provided with a first mounting hole, and the pole connector is provided facing the first mounting hole; The cover plate body is arranged on the second mounting surface, the cover plate body is provided with a second mounting hole, the second mounting hole is arranged facing the first mounting hole, and the output pole is penetrated through the first mounting hole and the second mounting hole.

3. The cell output electrode structure according to claim 2, characterized in that: The pole connector comprises: a first connecting portion, the first mounting hole being provided with a mounting groove, the first connecting portion being arranged in the mounting groove; a second connection portion, the second connection portion is connected to the first connection portion, and the second connection portion is arranged at an angle to the first connection portion; The first connecting portion includes a first surface and a second surface disposed opposite to each other; The second connecting portion includes a third surface and a fourth surface disposed opposite to each other; The tab is connected to the third surface.

4. The cell output electrode structure according to claim 3, characterized in that: The cell output electrode structure also includes: A first insulating member, the first insulating member is disposed on the first surface, and the first insulating member separates the first connecting portion and the electrode tab; A second insulating member is disposed on the fourth surface.

5. The cell output electrode structure according to claim 4, characterized in that: The first connection portion has a first predetermined thickness L1, wherein 1 mm≤L1≤2.5 mm; and / or the second connection portion has a second predetermined thickness W, wherein 1 mm≤W≤2.5 mm.

6. The cell output electrode structure according to claim 4, characterized in that: A supporting portion is disposed at the end of the lower plastic part, the supporting portion has a first predetermined height H1, and the second connecting portion has a second predetermined height H2, wherein H1>H2, (H1-H2)>1 mm.

7. The cell output electrode structure according to any one of claims 2 to 6, characterized in that: The cell output electrode structure also includes: An upper plastic part, the upper plastic part is arranged on the cover body, and the upper plastic part is provided with a fixing groove; A connecting piece is arranged in the fixing groove.

8. The cell output electrode structure according to claim 7, characterized in that: The cover plate body is provided with a first limiting portion, and the upper plastic part is provided with a second limiting portion that can be adaptively connected with the first limiting portion.

9. The cell output electrode structure according to claim 8, characterized in that: The cell output pole structure further includes a seal, which is disposed between the output pole and the connector.

10. A battery, characterized in that: The invention comprises the battery cell output electrode structure according to any one of claims 1 to 9.

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