Tab leading-out structure, battery cell, battery pack and electric equipment

Abstract

The utility model provides a tab leading-out structure, which is used for a battery cell and is characterized in that the tab leading-out structure comprises a welding area and a connecting piece, the welding area is one side surface of an assembly formed by welding tabs of a plurality of pole pieces, and the connecting piece is arranged on the side surface of the assembly. The welding area is located in the middle of the side face where the tab of the pole core is located and is parallel to the side face where the tab of the pole core is located, and the cross section of the welding area is upward in the height direction of the pole core; one end of the connecting piece is connected with the welding area, and the other end of the connecting piece is flatly attached to the end face of the pole core in the height direction. According to the scheme, the tabs of the laminated battery cells are upwards led out, and compared with a traditional mode that the battery cells are led out from the different sides of the tabs, the space utilization rate of the battery pack is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a lead-out structure for a battery core tab. Background Art

[0002] The current blade battery pack uses traditional stacked cells, which require lead-out at both ends of the package. The battery pack layout is limited, the package occupies a large space, and the space utilization rate is low. Utility Model Content

[0003] The utility model provides a tab lead-out structure, which solves the problem of low space utilization of a battery pack using conventional tab-leading cells on the opposite sides of the stacked cells by leading the tabs of the stacked cells upward.

[0004] In order to achieve the purpose of the utility model, the utility model provides the following technical solutions:

[0005] According to a first aspect of the utility model, a tab lead-out structure is provided for a battery cell, wherein the tab lead-out structure comprises a welding area and a connecting sheet.

[0006] The welding area is a side surface of a collection formed by welding the pole ears of multiple pole pieces. The welding area is located in the middle of the side surface where the pole ears of the pole core are located and is arranged parallel to the side surface where the pole ears of the pole core are located. The cross-section of the welding area is upward along the height direction of the pole core.

[0007] One end of the connecting piece is connected to the welding area, and the other end is arranged flush with the end surface of the pole core in the height direction.

[0008] Optionally, the multiple pole ears of the multiple pole pieces of the pole core are connected to the welding area and have a cutting margin, and the size of the pole ears should satisfy the following relationship:

[0009] K1>(H1 / 2)+3mm;

[0010] Among them, H1 is the pole core height and K1 is the pole ear length.

[0011] Optionally, the pole ear is located in the middle of one end of the pole piece, or may be located on one of the two sides of one end of the pole piece.

[0012] Optionally, the electrode sheets include a positive electrode sheet and a negative electrode sheet, the electrode ear located at one end of the positive electrode sheet is the positive electrode ear, and the electrode ear located at one end of the negative electrode sheet is the negative electrode ear, and a diaphragm is arranged between the stacking structure of the positive and negative electrode sheets. The electrode ears of the positive and negative electrode sheets can be arranged on the same side or on different sides, and the arrangement positions of the positive and negative electrode ears do not overlap in the height direction of the electrode core.

[0013] Optionally, the welding zone is the side of a pole lug assembly formed by folding, welding and cutting multiple pole lugs, the cross-section of the welding zone is a neat plane, the length of the welding zone is the length of the pole lug assembly formed by folding and welding multiple pole lugs toward the middle of the pole core extending to its cross-section, and the width of the welding zone is the width of the pole lug.

[0014] Optionally, there are two welding areas, which are two side surfaces of the tab assembly. Preferably, the side surface where the connecting piece is led out farther is selected as the welding area.

[0015] According to the second aspect of the utility model, a battery cell is provided, which includes the above-mentioned tab lead-out structure, a battery cell body, a battery cell shell and a cover plate assembly, the battery cell body and the tab lead-out structure are accommodated in the battery cell shell, one end of the tab lead-out structure is connected to the pole core body, and the other end is connected to the cover plate assembly, and the cover plate assembly covers the opening of the battery cell shell.

[0016] Optionally, the cover plate assembly includes a positive electrode column and a negative electrode column, the positive electrode connecting piece of the tab lead-out structure is connected to the positive electrode column, and the negative electrode connecting piece of the tab lead-out structure is connected to the negative electrode column.

[0017] According to a third aspect of the present invention, a battery pack is provided, comprising the above-mentioned battery cell and a battery casing, wherein the above-mentioned battery cell is accommodated in the above-mentioned battery casing.

[0018] According to a fourth aspect of the present invention, there is provided an electrical device, comprising the above-mentioned battery pack and an electrical device, wherein the above-mentioned battery pack supplies power to the above-mentioned electrical device.

[0019] The utility model provides a tab lead-out structure, which leads the tabs of a laminated battery cell upward, thereby improving the space utilization of a battery pack compared with a traditional tab lead-out battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 It is a schematic diagram of the pole core body of the utility model;

[0022] Figure 2 It is a schematic diagram of the pole core height of the utility model;

[0023] Figure 3 It is a schematic diagram of the length of the pole ear of the utility model;

[0024] Figure 4 It is a schematic diagram of the pole ear being led upwards in the utility model;

[0025] Figure 5 It is a schematic diagram of the bending of the connecting piece of the pole core body of the utility model;

[0026] Figure 6 This is a schematic diagram of the finished pole core of the utility model;

[0027] Figure 7 It is a schematic diagram of a battery pack of the utility model;

[0028] Description of reference numerals:

[0029] Negative electrode tab 1, positive electrode tab 2, diaphragm 3, fixing tape 4, pole core height 5, tab length 6, tab 7, welding area 8, negative electrode connecting piece 9, positive electrode connecting piece 10, protective tape 11, battery cell housing 12, negative electrode column 13, cover plate assembly 14, positive electrode column 15, battery pack 16. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the utility model to clearly and completely describe the technical solution in the utility model. Obviously, the described implementation is only a part of the implementation of the utility model, not all of the implementation. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there can be a central component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there can be a central component at the same time.

[0032] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as those commonly understood by those skilled in the art in the technical field of this invention. The terms used in the specification of this invention are only for the purpose of describing specific embodiments and are not intended to limit this invention. The term "and / or" used in this invention includes any and all combinations of one or more of the related listed items.

[0033] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0034] In the prior art, the battery cells of the blade battery pack use traditional stacked battery cells, which need to be led out at both ends in the package. The battery pack layout is limited, the package occupies a large space, and the space utilization rate is low.

[0035] refer to Figures 1 to 7 The utility model provides a lead-out structure of a pole ear 7 for a battery cell, wherein the lead-out structure of the pole ear 7 includes a welding area 8 and a connecting sheet.

[0036] The welding area 8 is a side surface of a collection formed by welding the pole ears 7 of multiple pole pieces. The welding area 8 is located in the middle of the side surface where the pole ears 7 of the pole core are located and is arranged parallel to the side surface where the pole ears 7 of the pole core are located. The cross-section of the welding area 8 is upward along the pole core height 5 direction.

[0037] One end of the connecting piece is connected to the welding area 8, and the other end is arranged flush with the end surface in the direction of the pole core height 5.

[0038] Specifically, the positive electrode sheet is made of lithium manganese iron phosphate material, the negative electrode sheet is made of silicon negative electrode material, the diaphragm 3 is made of polyimide material, the electrode sheet fixing tape 4 is made of insulating PET material, the pole ear protective tape 11 is made of strong PVC plastic, the pole ear 7 folding method can be manual for small batches, and large-scale batch production is preferably a mechanical jig folding method, the pole ear 7 welding can be laser welding, preferably ultrasonic welding, the end of the assembly formed after the pole ear 7 is welded is cut flat, and the two sides of the cut pole ear 7 assembly are the welding area 8, and the connecting piece is welded to the welding area 8. The pole ear 7 is led upward along the direction of the pole core height 5. In this scheme, the pole ear 7 is led upward, and the pole column is located above the battery cell. The series and parallel connection mode of the battery cell in the battery pack 16 can be flexibly selected according to the voltage, capacity, and size boundaries required by the battery pack 16, which greatly improves the space utilization rate inside the battery pack 16.

[0039] In one embodiment, the multiple pole tabs 7 of the multiple pole pieces of the pole core are connected to the welding area 8 and a cutting margin is left. The size of the pole tab 7 should satisfy the following relationship:

[0040] K1>(H1 / 2)+3mm;

[0041] Among them, H is the pole core height 5, and K is the pole ear 7 length 6.

[0042] Specifically, through the relationship between the length 6 of the pole lug 7 and the pole core height 5, it is ensured that the pole lugs 7 of all pole pieces of the pole core can be effectively connected to the welding area 8 after being folded toward the middle direction of the pole core height 5, and sufficient cutting area is retained, which improves the welding quality of the welding area 8 of the pole lug 7 and also provides convenience for the welding of the welding area 8 and the connecting piece in the subsequent process.

[0043] In one embodiment, the pole lug 7 is located in the middle of one end of the pole piece, and may also be located on one of the two sides of one end of the pole piece.

[0044] Specifically, the pole lug 7 can be arranged in the middle or on both sides of the pole piece as needed, preferably in the middle. The pole lug 7 is arranged in the middle of the pole piece, which improves the mechanical symmetry of the connection between the pole lug 7 and the pole piece to a certain extent, and improves the connection strength between the pole lug 7 and the pole piece.

[0045] In one embodiment, the electrode sheets include a positive electrode sheet and a negative electrode sheet, the electrode ear 7 located at one end of the positive electrode sheet is a positive electrode ear 72, and the electrode ear 7 located at one end of the negative electrode sheet is a negative electrode ear 71. A diaphragm 3 is arranged in the middle of the stacking structure of the positive and negative electrode sheets, and the electrode ears 7 of the positive and negative electrode sheets can be arranged on the same side or on different sides, and the arrangement positions of the positive and negative electrode ears 7 do not overlap in the direction of the electrode core height 5.

[0046] Specifically, the positive electrode tab 72 and the negative electrode tab 71 can be arranged on different sides, or can be arranged on the same side, preferably on different sides. If the tabs 7 are arranged on the same side, it should be ensured that the projections of the positive electrode tab 72 and the negative electrode tab 71 in the direction of the pole core height 5 do not overlap.

[0047] In one embodiment, the welding area 8 is the side of a collection of pole lugs 7 formed by folding, welding and cutting a plurality of pole lugs 7, the cross-section of the welding area 8 is a neat plane, the length of the welding area 8 is the length of the collection of pole lugs 7 folded and welded toward the middle of the pole core extending to its cross-section, and the width of the welding area 8 is the width of the pole lug 7.

[0048] Specifically, the welding area 8 should ensure a certain height, can be effectively bent, and have an effective welding area 8 with the connecting piece. The welding method of the pole ear 7 is preferably ultrasonic welding. The above-mentioned pole ear 7 assembly can be bent by manual jigs for small-scale production, and mechanical jigs are preferably used for large-scale production. Bending the pole ear 7 assembly upward can effectively reduce the width of the battery cell in the direction of the pole ear 7, which is convenient for leaving the welding area 8 for welding with the connecting piece. The above can ensure the connection area between the welding area 8 and the connecting piece and avoid certain connection defects.

[0049] In one embodiment, there are two welding areas 8 , which are two side surfaces of the electrode tab 7 assembly. Preferably, the side surface where the connecting piece is led out farther is selected as the welding area 8 .

[0050] Specifically, the welding area 8 is two side surfaces of the electrode lug 7 assembly after cutting, the assembly is folded in the direction of the electrode core height 5 to expose one side surface, and the assembly is folded in the opposite direction of the electrode core height 5 to expose the other side surface. Preferably, the side surface of the assembly folded in the direction of the electrode core height 5 is selected as the welding area 8, which can shorten the length of the connecting piece and save materials.

[0051] According to another embodiment of the present application, a battery cell is provided, which includes the above-mentioned pole ear 7 lead-out structure, a battery cell body, a battery cell shell 12 and a cover plate assembly 14. The battery cell body and the pole ear 7 lead-out structure are accommodated in the battery cell shell 12. One end of the pole ear 7 lead-out structure is connected to the pole core body, and the other end is connected to the cover plate assembly 14. The cover plate assembly 14 covers the opening of the battery cell shell 12.

[0052] Specifically, the battery cell uses the above-mentioned pole ear 7 lead-out structure, and two poles can be arranged on the end surface perpendicular to the large surface of the pole piece, and this end surface is also the top surface in the direction of the pole core height 5. The battery cell with this pole arrangement is easy to connect to each other.

[0053] In one embodiment, the cap plate assembly 14 includes a positive electrode column 15 and a negative electrode column 13 , a positive electrode connecting piece 10 of the electrode tab 7 lead-out structure is connected to the positive electrode column 15 , and a negative electrode connecting piece 9 of the electrode tab 7 lead-out structure is connected to the negative electrode column 13 .

[0054] Specifically, the battery cover is an important component of the battery system, which has multiple functions to ensure the safe and stable operation of the battery. The battery cover can protect the battery. The battery cover prevents external factors such as dust and moisture from entering the battery by fixing and sealing the battery, thereby protecting the battery from damage. The battery cover can conduct current. In the battery, the top cover pole, the adapter and the battery cell tab 7 are welded and connected to ensure the normal flow of the battery cell charge and discharge current.

[0055] According to another embodiment of the present application, a battery pack 16 is provided, which includes the above-mentioned battery cell and a battery casing, wherein the above-mentioned battery cell is accommodated in the above-mentioned battery casing.

[0056] Specifically, the battery cells of the above-mentioned battery pack 16 can be connected in a multi-row single-layer manner or in a multi-row multi-layer manner. The series-parallel connection method between the battery cells can also be flexibly selected. The internal space arrangement method of the battery pack 16 using the above-mentioned battery cells is flexible and changeable, which greatly improves the space utilization rate of the battery pack 16.

[0057] According to another embodiment of the present application, there is provided an electrical device, including the above-mentioned battery pack 16 and an electrical device, wherein the above-mentioned battery supplies power to the above-mentioned electrical device.

[0058] Specifically, the electrical equipment can be a new energy vehicle or an outdoor energy storage device, such as a portable battery with outdoor lighting function. In this case, the electrical appliance is a light tube, and the battery pack 16 supplies power to the light tube, which then emits light.

[0059] The utility model provides a structure for leading out a pole ear 7 , which improves the space utilization of the battery pack 16 by leading out the pole ear 7 of the laminated battery cell upwards, compared with the conventional battery cell with the pole ear 7 led out on the opposite side.

[0060] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship of terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" are based on the orientation or positional relationship described 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 cannot be understood as a limitation on the present invention.

[0061] What is disclosed above is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. A tab lead-out structure for a battery cell, characterized in that: The tab lead-out structure includes a welding area and a connecting piece. The welding area is a side surface of a collection formed by welding the pole ears of multiple pole pieces, the welding area is located in the middle of the side surface where the pole ear of the pole core is located and is arranged parallel to the side surface where the pole ear of the pole core is located, and the cross-section of the welding area is upward along the height direction of the pole core; One end of the connecting piece is connected to the welding area, and the other end is arranged flush with the end surface of the pole core in the height direction.

2. The tab lead-out structure according to claim 1, characterized in that: The multiple pole tabs of the multiple pole pieces of the pole core are connected to the welding area and have a cutting margin. The size of the pole tabs should satisfy the following relationship: K1>(H1 / 2)+3mm; Among them, H1 is the pole core height, and K1 is the pole ear length.

3. The tab lead-out structure according to claim 1 or 2, characterized in that: The pole lug is located in the middle of one end of the pole piece, and may also be located on one of the two sides of one end of the pole piece.

4. The tab lead-out structure according to claim 3, characterized in that: The electrode sheets include a positive electrode sheet and a negative electrode sheet, the electrode ear located at one end of the positive electrode sheet is a positive electrode ear, and the electrode ear located at one end of the negative electrode sheet is a negative electrode ear. A diaphragm is arranged between the stacking structure of the positive electrode sheet and the negative electrode sheet, and the positive electrode ear and the negative electrode ear can be arranged on the same side or on different sides. The arrangement positions of the positive electrode ear and the negative electrode ear do not overlap in the height direction of the electrode core.

5. The tab lead-out structure according to claim 1, characterized in that: The welding area is the side of a pole lug assembly formed by folding, welding and cutting a plurality of pole lugs, the cross-section of the welding area is a neat plane, the length of the welding area is the length of the pole lug assembly folded and welded toward the middle of the pole core extending to its cross-section, and the width of the welding area is the width of the pole lug.

6. The tab lead-out structure according to claim 5, characterized in that: There are two welding areas, which are respectively two side surfaces of the tab assembly.

7. A battery cell, characterized in that: It comprises the tab lead-out structure, battery cell body, battery cell shell and cover plate assembly as described in any one of claims 1 to 6, wherein the battery cell body and the tab lead-out structure are accommodated in the battery cell shell, one end of the tab lead-out structure is connected to the battery cell body, and the other end is connected to the cover plate assembly, and the cover plate assembly covers the opening of the battery cell shell.

8. The battery cell according to claim 7, characterized in that: The cap plate assembly comprises a positive electrode column and a negative electrode column. The positive electrode connecting piece of the tab lead-out structure is connected to the positive electrode column, and the negative electrode connecting piece of the tab lead-out structure is connected to the negative electrode column.

9. A battery pack, characterized in that: The invention comprises the battery cell according to claim 7 or 8 and a battery case, wherein the battery cell is accommodated in the battery case.

10. An electrical device, characterized in that: It comprises the battery pack as claimed in claim 9 and an electrical appliance, wherein the battery pack supplies power to the electrical appliance.

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