Single battery and assembly method of single battery

Abstract

The invention belongs to the technical field of batteries, and discloses a single battery and an assembling method of the single battery. The single battery comprises a plurality of pole cores, a first switching piece and a second switching piece, positive tabs and negative tabs are arranged at the two ends of the pole cores in the first direction respectively, the pole cores are stacked in the second direction, the positive tabs and the negative tabs extend in the second direction, the positive tabs of the pole cores are located on the same side, and the negative tabs of the pole cores are located on the same side. The second direction is perpendicular to the first direction; the two switching sheets extend along a second direction, the first switching sheet is fixedly provided with positive tabs of a plurality of pole cores, and the second switching sheet is fixedly provided with negative tabs of a plurality of pole cores; and the positive tab and the negative tab can be bent, so that the first adapter plate and the second adapter plate are correspondingly propped against two opposite end surfaces of the pole core in the first direction one by one. According to the single battery, the tabs can be of a full-tab structure, the internal resistance of the single battery is reduced, and the single battery is suitable for large-current charging and discharging and is higher in use safety.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a single cell battery and a method for assembling the single cell battery. Background Art

[0002] The single cell in the prior art often adopts the form of a positive terminal and a negative terminal on both sides. The current is transmitted from the current collector to the pole ear side and then led out through the pole ear to the pole column of the positive and negative poles of the top cover. Finally, the adapter is connected in series or in parallel and welded to form a single cell, so that the positive current and the negative current are led out from different directions to improve the capacity of the single cell and the grouping efficiency of the entire battery module. The above-mentioned connection grouping method will reduce the size of the positive and negative pole ears, and has high requirements for the processing of the pole ears. It is easy to have product defects such as poor consistency of the pole core, and it will also affect the current capacity and internal resistance of the single cell. At the same time, the processing cost of the single cell is high and the process is complicated. With the continuous iteration of technology in the new energy industry, in order to further meet the market needs of large current charging and discharging, safety performance and other single cells, the above-mentioned connection grouping method is no longer applicable.

[0003] Therefore, there is an urgent need to provide a new type of single cell and a method for assembling the single cell, so as to solve the above technical problems in the prior art. Summary of the invention

[0004] An object of the present invention is to provide a single cell battery, which can make the pole tab present a full pole tab structure, reduce the internal resistance of the single cell battery, is suitable for large current charging and discharging, and has higher safety in use.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] The single battery comprises a plurality of pole cores, a first adapter plate and a second adapter plate, wherein the two ends of the pole core along the first direction are respectively provided with a positive pole ear and a negative pole ear, and the plurality of pole cores are stacked along the second direction, the positive pole ear and the negative pole ear are both extended along the second direction and the positive pole ears of the plurality of pole cores are all located on the same side, and the second direction is different from the first direction; the two adapter plates are both extended along the second direction, the positive pole ears of the plurality of pole cores are fixed to the first adapter plate, and the negative pole ears of the plurality of pole cores are fixed to the second adapter plate; wherein the positive pole ear and the negative pole ear can be bent so that the first adapter plate and the second adapter plate correspondingly abut against the two end surfaces of the pole core opposite to each other along the first direction.

[0007] Optionally, the first adapter plate and the second adapter plate include a connecting portion and a clamping portion, the connecting portion is extended along the second direction, the clamping portion is extended along the first direction, the clamping portion is connected to the first end of the connecting portion along the second direction, the connecting portion abuts against one end of the pole core along the first direction, the two clamping portions abut against the outer walls at both ends of a stack of a plurality of pole cores along the second direction, and the clamping portion is connected to the pole of the single cell.

[0008] Optionally, the single cell further comprises two insulating supports, each of which is provided with a snap-in groove, the insulating supports abut against outer walls at both ends of a stack of a plurality of pole cores along the second direction, and the snap-in portion is snap-into the snap-in groove.

[0009] Optionally, the clamping portion is provided with a clamping protrusion along the second direction and toward the pole core protrusion, and the clamping protrusion is buckled in the clamping groove.

[0010] Optionally, the insulating bracket is provided with a plurality of weight-reducing through holes.

[0011] Optionally, an insulating partition is provided between two adjacent pole cores.

[0012] Optionally, the pole core is adhesively fixed to the insulating partition.

[0013] Optionally, the coverage area of ​​each of the positive electrode tab and the negative electrode tab on the end surface of the pole core along the second direction is D, the area of ​​any end surface of the pole core along the second direction is S, and D / S>0.25.

[0014] Optionally, the width of the first adapter plate and the second adapter plate is H, the thickness of the pole core is L, and H≤L.

[0015] Another object of the present invention is to provide a method for assembling a single cell battery, which is used for assembling a single cell battery as described in any of the above schemes, and includes the steps of: S1, stacking a plurality of the pole cores along the second direction, with the positive pole ears of the plurality of pole cores being located on the same side; S2, welding and fixing the first adapter plate to the positive pole ears of the plurality of the pole cores, and welding and fixing the second adapter plate to the negative pole ears of the plurality of the pole cores; S3, bending the positive pole ear and the negative pole ear so that the two adapter plates are in one-to-one correspondence with each other and abut against the two end surfaces of the pole core opposite to each other along the first direction.

[0016] Beneficial effects:

[0017] The single cell battery in the present invention uses several pole cores to be stacked and arranged along the second direction, and the positive pole ears of the several pole cores are all located on the same side, and the several negative pole ears are all located on the other side. At the same time, a first adapter plate is used to fix the positive pole ears of the several pole cores, and another second adapter plate is used to fix the negative pole ears of the pole cores to achieve series connection and fixation of the pole cores. After fixation, the positive pole ear and the negative pole ear are bent so that the first adapter plate and the second adapter plate abut against the two end walls of the pole core along the first direction; and the positive pole ear and the negative pole ear both extend along the second direction, so that the positive pole ear and the negative pole ear can be set to a full pole ear structure, which increases the surface area of ​​the positive pole ear and the negative pole ear and the contact area with the corresponding adapter plate, improves the current capacity of the single cell battery, reduces the internal resistance, reduces the temperature rise during the charging and discharging process, is suitable for large current charging and discharging, is safer to use, and has a simple manufacturing process, which can reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is an axonometric diagram of a single cell provided by a specific embodiment of the present invention with some structures hidden;

[0019] Figure 2 is a side view of a single cell provided by a specific embodiment of the present invention with part of the structure hidden;

[0020] Figure 3 This is an exploded view of a single cell provided by a specific embodiment of the present invention with some structures hidden;

[0021] Figure 4 yes Figure 3 A partial enlarged view of the middle A;

[0022] Figure 5 It is a process diagram of a single cell assembly provided in a specific embodiment of the present invention.

[0023] In the figure:

[0024] 100, pole core; 110, positive pole ear; 120, negative pole ear;

[0025] 200, first adapter plate; 201, second adapter plate; 210, connecting portion; 220, clamping portion; 221, clamping protrusion;

[0026] 300, insulating bracket; 310, snap-in groove; 311, weight-reducing through hole;

[0027] 400. Insulating partition. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0029] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 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.

[0030] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0031] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0032] The first direction described in this embodiment is Figure 1 The X direction is the length direction of the pole core 100; the second direction is Figure 1 The Y direction shown in , that is, the width direction of the pole core 100; specifically, the first direction is perpendicular to the second direction.

[0033] like Figure 1As shown, the single cell includes a plurality of pole cores 100, a first adapter plate 200 and a second adapter plate 201, wherein the two ends of the pole core 100 along the first direction are respectively provided with a positive pole ear 110 and a negative pole ear 120, and the plurality of pole cores 100 are stacked along the second direction, the positive pole ear 110 and the negative pole ear 120 are both extended along the second direction and the positive pole ears 110 of the plurality of pole cores 100 are all located on the same side, and the second direction is different from the first direction; the first adapter plate 200 and the second adapter plate are both extended along the second direction, the first adapter plate 200 is fixed with the positive pole ears 110 of the plurality of pole cores 100, and the second adapter plate is fixed with the negative pole ears 120 of the plurality of pole cores 100; wherein the positive pole ears 110 and the negative pole ears 120 can be bent so that the first adapter plate 200 and the second adapter plate are in one-to-one correspondence against the two end surfaces of the pole core 100 opposite to each other along the first direction.

[0034] The single battery in this embodiment uses a plurality of pole cores 100 to be stacked and arranged along the second direction, and the positive pole ears 110 of the plurality of pole cores 100 are all located on the same side, and the plurality of negative pole ears 120 are all located on the other side. At the same time, a first adapter 200 is used to fix the positive pole ears 110 of the plurality of pole cores 100, and another second adapter 201 is used to fix the negative pole ears 120 of the pole cores 100, so as to realize the series connection and fixation of the pole cores 100. After fixation, the positive pole ears 110 and the negative pole ears 120 are bent so that the first adapter 200 and the second adapter 201 are connected. 01 corresponds to abutting against the two end walls of the pole core 100 along the first direction; and the positive pole ear 110 and the negative pole ear 120 both extend along the second direction, so that the positive pole ear 110 and the negative pole ear 120 can be set as a full pole ear structure, which increases the surface area of ​​the positive pole ear 110 and the negative pole ear 120 and the contact area with the first adapter plate 200 or the second adapter plate 201, improves the current capacity of the single cell, reduces the internal resistance, and reduces the temperature rise during the charging and discharging process. It is suitable for large current charging and discharging, is safer to use, and has a simple manufacturing process, which can reduce production costs.

[0035] Furthermore, an insulating partition 400 is provided between two adjacent pole cores 100. The insulating partition 400 implements insulation between two adjacent pole cores 100, avoids short circuit between the two pole cores 100, and improves safety.

[0036] In this embodiment, the pole core 100 is bonded and fixed to the insulating separator 400. Specifically, the pole core 100 is fixed to the insulating separator 400 by gluing, pouring glue or tape, which can achieve good fixation of the pole core 100 and the insulating separator 400, and when multiple pole cores 100 are stacked and placed inside the battery shell, the multiple pole cores 100 are limited, which facilitates the insertion of the pole cores 100 into the shell after stacking.

[0037] like Figure 2 and Figure 3 As shown, the first adapter plate 200 and the second adapter plate 201 both include a connecting portion 210 and a clamping portion 220, the connecting portion 210 is extended along the second direction, the clamping portion 220 is extended along the first direction, and the clamping portion 220 is connected to the first end of the connecting portion 210 along the second direction (i.e. Figure 1 The +y end shown in the figure, and for the second adapter 201, the clamping portion 220 is connected to the -y end of the above-mentioned connecting portion 210), the above-mentioned connecting portion 210 abuts against one end of the above-mentioned pole core 100 along the above-mentioned first direction, and the two above-mentioned clamping portions 220 abut against the outer walls of the two ends (+y end and -y end) of the stacked body formed by the plurality of the above-mentioned pole cores 100 along the above-mentioned second direction, and the above-mentioned clamping portion 220 is connected to the pole column of the above-mentioned single battery. In this embodiment, the connecting portion 210 of the first adapter 200 connects the plurality of pole cores 100 stacked along the second direction in series, and at the same time, the two ends of the pole core 100 after the series connection along the second direction are respectively provided with the clamping portions 220 of the first adapter 200 and the second adapter 201, and the pole columns at the two ends of the single battery along the second direction are respectively connected to the above-mentioned first adapter 200 and the second adapter 201, so that the single battery is formed into a structure with pole ears at both ends, so as to realize the electrical connection between the pole core 100 and the external structure.

[0038] It should be noted that the first adapter plate 200 connected to the positive electrode ear 110 is made of aluminum, and the second adapter plate 201 connected to the negative electrode ear 120 is made of copper. The first adapter plate 200 and the second adapter plate 201 are welded to the positive electrode ear 110 and the negative electrode ear 120 respectively, which will not be repeated here.

[0039] For further information, please refer to Figure 2 and Figure 3 The above-mentioned single battery also includes two insulating brackets 300, and the above-mentioned insulating brackets 300 are provided with a clamping groove 310. The above-mentioned insulating brackets 300 abut against the outermost wall surfaces of the plurality of the above-mentioned pole cores 100 along the above-mentioned second direction, and the above-mentioned clamping portion 220 is clamped in the above-mentioned clamping groove 310. The insulating bracket 300 realizes the insulating connection between the clamping portion 220 of the first adapter 200 and the second adapter 201 and the side wall of the pole core 100, thereby improving the insulation and safety performance, and the clamping groove 310 of the insulating bracket 300 fixes the clamping portion 220, thereby improving the fixing effect and stability of the first adapter 200, the second adapter 201 and the pole core 100, and improving the safety and service life of the single battery.

[0040] Furthermore, the insulating support 300 is provided with a plurality of weight-reducing through holes 311. The provision of the weight-reducing through holes 311 can reduce the weight of the insulating support 300, thereby increasing the energy density per unit mass of the single battery.

[0041] Optionally, the width of the first adapter sheet 200 and the second adapter sheet 201 is H, the thickness of the pole core 100 is L, and H≤L. Such a configuration enables the first adapter sheet 200 and the second adapter sheet 201 to not exceed the thickness of the pole core 100 after being attached and fixed to the surface of the pole core 100, thereby not increasing the thickness of the single battery, reducing the space occupied by the first adapter sheet 200, and improving the energy density per unit volume of the single battery.

[0042] Optionally, the coverage area of ​​the positive electrode ear 110 and the negative electrode ear 120 on the end surface of the pole core 100 along the second direction is D, and the area of ​​any end surface of the pole core 100 along the second direction is S, and D / S>0.25. Such a setting can make the surface area of ​​the positive electrode ear 110 and the negative electrode ear 120 as large as possible, improve the current capacity of the pole core 100 and the single battery, and have a smaller internal resistance, and can achieve the welding and fixing effect of the positive electrode ear 110 and the negative electrode ear 120 with the corresponding first adapter 200 and second adapter 201, respectively, thereby improving the safety of the single battery.

[0043] like Figure 4 As shown, the clamping portion 220 is provided with a clamping protrusion 221 protruding along the second direction and toward the pole core 100, and the clamping protrusion 221 is buckled in the clamping groove 310. In this embodiment, two clamping protrusions 221 are provided, extending along the first direction and the second direction respectively, which can limit and fix the clamping portion 220 along the first direction and the second direction to prevent the clamping portion 220 from falling off from the insulating bracket 300.

[0044] like Figure 5 As shown, the present embodiment further provides a method for assembling a single cell battery, which is used for assembling a single cell battery as described in any of the above schemes, and includes the following steps: S1, stacking a plurality of the pole cores 100 along the second direction, wherein the positive pole ears 110 of the plurality of pole cores 100 are all located on the same side; S2, welding and fixing the first adapter plate 200 to the positive pole ears 110 of the plurality of the pole cores 100, and welding and fixing the second adapter plate 201 to the negative pole ears 120 of the plurality of the pole cores 100; S3, bending the positive pole ear 110 and the negative pole ear 120 so that the first adapter plate 200 and the second adapter plate 201 are in one-to-one correspondence with each other and abut against the two end surfaces of the pole core 100 opposite to each other along the first direction.

[0045] Furthermore, the method further includes providing an insulating bracket 300 at both ends (i.e., the +y end and the -y end) of the stack of the pole core 100 along the second direction, and the clamping portion 220 is engaged with the clamping groove 310 of the insulating bracket 300.

[0046] The assembly method of the single cell in the present embodiment can realize the assembly of the single cell in the present embodiment, and can enable the positive electrode ear 110 and the negative electrode ear 120 to be set as a full-electrode ear structure, thereby increasing the surface area of ​​the positive electrode ear 110 and the negative electrode ear 120 and the contact area with the first adapter plate 200, thereby increasing the current carrying capacity of the single cell, reducing the internal resistance, and reducing the temperature rise during the charging and discharging process. It is suitable for large current charging and discharging, is safer to use, and has a simple manufacturing process, which can reduce production costs.

[0047] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A single cell, characterized in that: include: A plurality of pole cores (100), wherein the two ends of the pole cores (100) along a first direction are respectively provided with a positive pole ear (110) and a negative pole ear (120), and the plurality of pole cores (100) are stacked along a second direction, wherein the positive pole ear (110) and the negative pole ear (120) are both extended along the second direction and the positive pole ears (110) of the plurality of pole cores (100) are all located on the same side, and the second direction is different from the first direction; A first adapter plate (200) and a second adapter plate (201), wherein the first adapter plate (200) and the second adapter plate (201) are both extended along the second direction, the first adapter plate (200) is fixed with a plurality of the positive pole ears (110) of the pole core (100), and the second adapter plate (201) is fixed with a plurality of the negative pole ears (120) of the pole core (100); wherein the positive pole ears (110) and the negative pole ears (120) are both capable of being bent so that the first adapter plate (200) and the second adapter plate (201) are correspondingly abutted against two opposite end surfaces of the pole core (100) along the first direction.

2. The single cell according to claim 1, characterized in that: The first adapter plate (200) and the second adapter plate both comprise a connecting portion (210) and a clamping portion (220); the connecting portion (210) is extended along the second direction; the clamping portion (220) is extended along the first direction; the clamping portion (220) is connected to a first end of the connecting portion (210) along the second direction; the connecting portion (210) abuts against one end of the pole core (100) along the first direction; the two clamping portions (220) abut against two end outer walls of a stack of a plurality of pole cores (100) along the second direction in a one-to-one correspondence; and the clamping portion (220) is connected to a pole of the single cell.

3. The single cell according to claim 2, characterized in that: The single cell battery further comprises two insulating supports (300), the insulating supports (300) being provided with clamping grooves (310), the insulating supports (300) being in contact with the outermost wall surfaces of a plurality of the pole cores (100) along the second direction, and the clamping portions (220) being clamped in the clamping grooves (310).

4. The single cell according to claim 3, characterized in that: The clamping portion (220) is provided with a clamping protrusion (221) protruding along the second direction and toward the pole core (100), and the clamping protrusion (221) is buckled in the clamping groove (310).

5. The single cell according to claim 3, characterized in that: The insulating support (300) is provided with a plurality of weight-reducing through holes (311).

6. The single cell according to claim 1, characterized in that: An insulating partition (400) is provided between two adjacent pole cores (100).

7. The single cell according to claim 6, characterized in that: The pole core (100) is adhesively fixed to the insulating partition (400).

8. The single cell according to any one of claims 1 to 7, characterized in that: The coverage area of ​​each of the positive electrode tab (110) and the negative electrode tab (120) on the end surface of the pole core (100) along the second direction is D, the area of ​​any end surface of the pole core (100) along the second direction is S, and D / S>0.

25.

9. The single cell according to any one of claims 1 to 7, characterized in that: The width of the first adapter plate (200) and the second adapter plate (201) are both H, the thickness of the pole core (100) is L, and H≤L.

10. A method for assembling a single battery, characterized in that: For assembling a single battery as claimed in any one of claims 1 to 9, comprising the steps of: S1. stacking a plurality of the electrode cores (100) along a second direction, with the positive electrode ears (110) of the plurality of electrode cores (100) being located on the same side; S2, welding and fixing the first adapter plate (200) to the positive pole ears (110) of the plurality of pole cores (100), and welding and fixing the second adapter plate (201) to the negative pole ears (120) of the plurality of pole cores (100); S3, bending the positive electrode tab (110) and the negative electrode tab (120) so that the two adapter plates (200) are in one-to-one contact with the two end surfaces of the electrode core (100) that are opposite to each other along the first direction.

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