Laminated battery

Abstract

The utility model discloses a laminated battery. The laminated battery comprises a battery cell shell and a battery cell main body, a negative electrode connecting part and at least two positive electrode connecting parts are arranged on one side of the battery cell shell; the battery cell main body is arranged in the battery cell shell, one side of the battery cell main body is provided with negative tabs and positive tabs, the number of the positive tabs is in one-to-one correspondence with that of the positive connecting parts, the negative tabs are connected with the negative connecting parts, and the positive tabs are connected with the positive connecting parts in a one-to-one correspondence manner. By arranging the two or more positive tabs, the connection area of the battery cell main body and the battery cell shell through the tabs is increased, and the stress can be better dispersed when the battery falls off, so that the risk that the tabs are torn off when the battery falls off is reduced, and the local heating of the battery can be reduced and the charging and discharging efficiency can be improved when the battery is normally used.

Description

Technical Field

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

[0002] Some existing laminated batteries include a battery body and a battery shell, the battery body is provided with a positive electrode ear and a negative electrode ear, the battery shell is provided with a positive electrode column and a negative electrode column, the positive electrode ear of the battery body is connected to the positive electrode column of the battery shell, and the negative electrode ear of the battery body is connected to the negative electrode column of the battery shell. However, when a laminated battery of this structure is dropped, the electrode ear is relatively easy to tear, and the heat generated during charging and discharging during normal use is relatively high, and the efficiency of charging and discharging still has room for improvement. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a laminated battery, which can reduce the risk of the tab tearing when falling, reduce the heat generated by charging and discharging, and improve the charging and discharging efficiency.

[0004] According to an embodiment of the utility model, the laminated battery comprises a cell shell and a cell body. A negative electrode connection part and at least two positive electrode connection parts are arranged on one side of the cell shell; the cell body is arranged in the cell shell, and a negative electrode ear and positive electrode ears corresponding to the number of the positive electrode connection parts are arranged on one side of the cell body, the negative electrode ear is connected to the negative electrode connection part, and the positive electrode ear is connected to the positive electrode connection part in a one-to-one correspondence.

[0005] The stacked battery according to the embodiment of the utility model has at least the following beneficial effects: by providing two or more positive pole ears, the connection area between the battery cell body and the battery cell shell through the pole ears is increased, and the force can be better dispersed when the battery falls, thereby reducing the risk of tearing at each pole ear when falling, and can reduce local heating of the battery during normal use and improve charging and discharging efficiency.

[0006] According to some embodiments of the present invention, two positive electrode connecting parts are provided, and the two positive electrode connecting parts and the negative electrode connecting part are arranged at intervals along a straight line.

[0007] According to some embodiments of the present invention, the negative electrode connecting portion is located between the two positive electrode connecting portions.

[0008] According to some embodiments of the utility model, the battery cell body includes at least two negative electrode sheets and at least two positive electrode sheets, all of the positive electrode sheets and all of the negative electrode sheets are alternately stacked, and the side edges of the negative electrode sheets are provided with negative electrode extension sheets, and all of the negative electrode extension sheets are arranged and overlapped along the stacking direction of the positive electrode sheets and the negative electrode sheets to form the negative electrode ears; the side edges of the positive electrode sheets are provided with first positive electrode extension sheets and second positive electrode extension sheets, and all of the first positive electrode extension sheets are arranged and overlapped along the stacking direction of the positive electrode sheets and the negative electrode sheets to form one of the positive electrode ears, and all of the second positive electrode extension sheets are arranged and overlapped along the stacking direction of the positive electrode sheets and the negative electrode sheets to form the other positive electrode ear.

[0009] According to some embodiments of the utility model, the battery cell body includes at least two negative electrode sheets and at least two positive electrode sheets, all of the positive electrode sheets and all of the negative electrode sheets are alternately stacked, and the side edges of the negative electrode sheets are provided with negative electrode extension sheets, and all of the negative electrode extension sheets are arranged and overlapped along the stacking direction of the positive electrode sheets and the negative electrode sheets to form the negative electrode ears; the side edges of some of the positive electrode sheets are provided with first positive electrode extension sheets, and the side edges of another part of the positive electrode sheets are provided with second positive electrode extension sheets, all of the first positive electrode extension sheets are arranged and overlapped along the stacking direction of the positive electrode sheets and the negative electrode sheets to form one of the positive electrode ears, and all of the second positive electrode extension sheets are arranged and overlapped along the stacking direction of the positive electrode sheets and the negative electrode sheets to form the other positive electrode ears.

[0010] According to some embodiments of the utility model, the battery cell shell includes a steel shell, the negative electrode connecting part is a part of the steel shell, the positive electrode connecting part is a positive electrode column, and the positive electrode column is insulated from the steel shell.

[0011] According to some embodiments of the present invention, the width of the negative electrode ear is A, and the width of the positive electrode ear is B, satisfying A≥B.

[0012] According to some embodiments of the present invention, the positive electrode ear and the negative electrode ear are both provided with protective glue, and the width of the protective glue is C, satisfying 30mm≥C>A.

[0013] According to some embodiments of the present invention, the width C of the protective adhesive satisfies: 14 mm ≥ C ≥ 8 mm.

[0014] According to some embodiments of the present invention, the positive electrode ear and the negative electrode ear are both provided with protective glue, the width of the negative electrode ear is A, and the width of the positive electrode ear is B, satisfying B=2 / 3A.

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

[0016] 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:

[0017] Figure 1 It is a schematic front view of a laminated battery according to an embodiment of the utility model;

[0018] Figure 2 A schematic top view of a laminated battery according to an embodiment of the present utility model;

[0019] Figure 3 It is a front view schematic diagram of the battery core body of an embodiment of the utility model.

[0020] Reference numerals:

[0021] Battery cell housing 100, negative electrode connection portion 110, positive electrode connection portion 120;

[0022] The battery cell body 200 , the negative electrode ear 210 , the positive electrode ear 220 , and the protective glue 230 . DETAILED DESCRIPTION

[0023] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0024] In the description of the present invention, it should be understood that the descriptions involving orientation, such as the orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 a limitation on the present invention.

[0025] In the description of the present utility model, "a plurality" means more than two. If there is a description of "first" or "second", it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0026] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0027] Some existing laminated batteries include a battery body 200 and a battery shell 100, wherein the battery body 200 is provided with a positive electrode ear 220 and a negative electrode ear 210, and the battery shell 100 is provided with a positive electrode column and a negative electrode column, wherein the positive electrode ear 220 of the battery body 200 is connected to the positive electrode column of the battery shell 100, and the negative electrode ear 210 of the battery body 200 is connected to the negative electrode column of the battery shell 100. However, when such a laminated battery is dropped, the ear is relatively easy to tear, and the heat generated during charging and discharging during normal use is relatively high, and the efficiency of charging and discharging still has room for improvement.

[0028] Reference Figures 1 to 3 , is a laminated battery of an embodiment of the utility model, comprising a cell shell 100 and a cell body 200. A negative electrode connection part 110 and at least two positive electrode connection parts 120 are arranged on one side of the cell shell 100; the cell body 200 is arranged in the cell shell 100, and a negative electrode ear 210 and a positive electrode ear 220 corresponding to the number of the positive electrode connection parts 120 are arranged on one side of the cell body 200, the negative electrode ear 210 is connected to the negative electrode connection part 110, and the positive electrode ear 220 is connected to the positive electrode connection part 120 in a one-to-one correspondence.

[0029] By providing two or more positive tabs 220, the connection area between the battery body 200 and the battery shell 100 through the tabs is increased, and the force can be better dispersed when the battery falls, thereby reducing the risk of tearing at each tab when falling, and can reduce local heating of the battery during normal use and improve charging and discharging efficiency.

[0030] In the embodiment, two positive electrode connection parts 120 are provided, and the two positive electrode connection parts 120 and the negative electrode connection part 110 are arranged at intervals along a straight line. The arrangement of two positive electrode connection parts 120 and one negative electrode connection part 110 can reduce the risk of the pole ear being torn when falling, reduce the heat generation during normal use, and improve the charging and discharging efficiency, while making the structure of the battery the simplest. The positive electrode connection part 120 and the negative electrode connection part 110 are arranged in a straight line, which is better adapted to the power supply structure of existing electrical equipment.

[0031] In an embodiment, the negative electrode connection portion 110 is located between the two positive electrode connections 120. The above structure can reduce the risk of local overtemperature when the battery is charged and discharged. During the charging or discharging process, the temperature of the area near the positive electrode ear 220 and the area near the negative electrode ear 210 are different. Therefore, the two positive electrode connections 120 are separated by the negative electrode connection portion 110. It can be avoided that in some cases, when the temperature of the area near the positive electrode ear 220 is high, the risk of the two relatively high temperature areas near the positive electrode ears 220 overlapping each other. It is conceivable that in other embodiments, the negative electrode connection portion 110 can also be located on the same side of the two positive electrode connections 120, and those skilled in the art can make specific configurations according to actual needs.

[0032] It is conceivable that the cell housing 100 may be provided with more than two positive electrode connecting parts 120 , and the corresponding cell body 200 may also be provided with more than two positive electrode ears 220 . Those skilled in the art may make specific configurations according to actual needs.

[0033] It is understandable that the positive electrode connection portion 120 and the negative electrode connection portion 110 may not be arranged along a straight line. For example, the positive electrode connection portion 120 and the negative electrode connection portion 110 may be arranged in an irregular manner. Those skilled in the art may make specific configurations according to actual needs.

[0034] In some embodiments, the battery cell body 200 includes at least two negative electrode sheets and at least two positive electrode sheets, all of which are alternately stacked, and the side edges of the negative electrode sheets are provided with negative electrode extension sheets, and all of which are arranged and overlapped along the stacking direction of the positive electrode sheets and the negative electrode sheets to form a negative electrode ear 210; the side edges of the positive electrode sheets are provided with a first positive electrode extension sheet and a second positive electrode extension sheet, and all of which are arranged and overlapped along the stacking direction of the positive electrode sheets and the negative electrode sheets to form one of the positive electrode ears 220, and all of which are arranged and overlapped along the stacking direction of the positive electrode sheets and the negative electrode sheets to form another positive electrode ear 220. The above-mentioned battery cell body 200 can form two positive electrode ears 220 and one negative electrode ear 210, and in the two positive electrode ears 220, the number of the first positive electrode extension sheet, the second positive electrode extension sheet and the negative electrode extension sheet is substantially the same, so that the battery cell body 200 has good anti-drop performance, simple structure, and is easy to implement.

[0035] In other embodiments, the battery cell body 200 includes at least two negative electrode sheets and at least two positive electrode sheets, all positive electrode sheets and all negative electrode sheets are alternately stacked, and the side edges of the negative electrode sheets are provided with negative electrode extension sheets, and all negative electrode extension sheets are arranged and overlapped along the stacking direction of the positive electrode sheets and the negative electrode sheets to form a negative electrode ear 210; the side edges of some positive electrode sheets are provided with first positive electrode extension sheets, and the side edges of another part of the positive electrode sheets are provided with second positive electrode extension sheets, and all first positive electrode extension sheets are arranged and overlapped along the stacking direction of the positive electrode sheets and the negative electrode sheets to form one of the positive electrode ears 220, and all second positive electrode extension sheets are arranged and overlapped along the stacking direction of the positive electrode sheets and the negative electrode sheets to form another positive electrode ear 220. The above-mentioned battery cell body 200 can also form two positive electrode ears 220 and one negative electrode ear 210, and save a part of the material of the positive electrode ear 220. Specifically, usually half of the positive electrode sheets are provided with the first positive electrode extension sheet, and the other half of the positive electrode sheets are provided with the second positive electrode extension sheet. In this case, the number of the first positive electrode extension sheet and the second positive electrode extension sheet is half of the number of the negative electrode extension sheet. It can be understood that the number of the first positive electrode extension sheet and the number of the second positive electrode extension sheet can also be different, that is, the number of positive electrode sheets provided with the first positive electrode extension sheet can be more or less than the number of positive electrode sheets provided with the second positive electrode extension sheet, and those skilled in the art can make specific configurations according to actual needs.

[0036] Specifically, the battery cell main body 200 may include two or more negative electrode sheets and two or more positive electrode sheets. Usually, the number of positive electrode sheets is the same as the number of negative electrode sheets, or the number of positive electrode sheets is one more or one less than the number of negative electrode sheets, so as to form a battery cell main body 200 in which positive electrode sheets and negative electrode sheets are alternately stacked. Technical personnel in this field can make specific configurations according to actual needs.

[0037] In the embodiment, the battery cell housing 100 includes a steel shell, the negative electrode connection portion 110 is a part of the steel shell, the positive electrode connection portion 120 is a positive electrode column, and the positive electrode column is insulated from the steel shell. Using the steel shell as a part of the battery cell housing 100 can improve the energy density of the battery and improve the structural strength of the battery. The steel shell is also used as the negative electrode of the battery, which simplifies the structure of the battery and reduces the difficulty of production and manufacturing. The steel shell itself has a high structural strength, which has a good improvement on the safety performance of the battery.

[0038] Specifically, the steel shell is provided with a clearance hole, the positive electrode column is passed through the clearance hole, and the outer periphery of the positive electrode column is sheathed with PFA plastic, so that the positive electrode column is insulated from the steel shell to avoid short circuit between the positive electrode column and the steel shell.

[0039] It is conceivable that the battery cell shell 100 can also be made of other materials. In this case, the positive electrode connection part 120 can be a positive electrode column, and the negative electrode connection part 110 can be a negative electrode column. The positive electrode column and the negative electrode column are arranged on the same side of the battery cell shell 100 and are insulated from each other. For example, the battery cell shell 100 is made of insulating plastic so that the positive electrode column and the negative electrode column can be insulated from each other; or the battery cell shell 100 is made of metal material, and the outer periphery of the positive electrode column and the outer periphery of the negative electrode column are both sheathed with insulating plastic to insulate the positive electrode column and the negative electrode column.

[0040] In the embodiment, the width of the negative electrode ear 210 is A, and the width of the positive electrode ear 220 is B, satisfying A≥B. The electrode ears are usually covered with a protective glue 230. The above structure increases the connection area between the positive electrode ear 220, the negative electrode ear 210 and the battery cell housing 100, while minimizing the width of the area occupied by the positive electrode ear 220 and the negative electrode ear 210, and avoiding interference between the protective glue 230.

[0041] In the embodiment, the positive electrode ear 220 and the negative electrode ear 210 are both provided with a protective glue 230, and the width of the protective glue 230 is C, satisfying 30 mm ≥ C > A. The width of the protective glue 230 is greater than the width of the positive electrode ear 220 and the negative electrode ear 210, so that the protective glue 230 can completely protect the welding area of ​​the positive electrode ear 220 and the negative electrode ear 210, and avoid interference between different protective glues 230 caused by excessive width of the protective glue 230, and reduce material waste of the protective glue 230.

[0042] In the embodiment, the width C of the protective adhesive 230 satisfies: 14 mm ≥ C ≥ 8 mm, which satisfies the size requirement of the normal positive electrode tab 220 and the negative electrode tab 210 to be affixed with the protective adhesive 230 and minimizes the waste of the protective adhesive 230 .

[0043] In the embodiment, the positive electrode ear 220 and the negative electrode ear 210 are both provided with protective glue 230, the width of the negative electrode ear 210 is A, and the width of the positive electrode ear 220 is B, satisfying B=2 / 3A. While increasing the connection area between the positive electrode ear 220, the negative electrode ear 210 and the battery cell housing 100, it is relatively good to minimize the width of the area occupied by the positive electrode ear 220 and the negative electrode ear 210, and avoid interference between the protective glue 230.

[0044] Specifically, the width of one end of the positive electrode column located inside the battery cell shell 100 is D, satisfying D>C, so that the connection effect between the positive electrode tab 220 and the positive electrode column is better.

[0045] Specifically, the positive electrode tab 220 is connected to the positive electrode column by welding, and the negative electrode tab 210 is connected to the negative electrode connection portion 110 by welding. A diaphragm is provided between the positive electrode sheet and the negative electrode sheet of the battery body 200. Usually, there is also an electrolyte inside the battery housing 100, and the battery body 200 is immersed in the electrolyte.

[0046] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0047] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A laminated battery, characterized in that: include: A battery cell casing (100) having a negative electrode connection portion (110) and at least two positive electrode connection portions (120) disposed on one side; A battery cell body (200) is arranged in the battery cell shell (100), and one side of the battery cell body (200) is provided with a negative electrode ear (210) and positive electrode ears (220) corresponding to the number of the positive electrode connecting parts (120). The negative electrode ears (210) are connected to the negative electrode connecting parts (110), and the positive electrode ears (220) are connected to the positive electrode connecting parts (120) in a one-to-one correspondence.

2. The laminated battery according to claim 1, characterized in that: Two positive electrode connecting parts (120) are provided, and the two positive electrode connecting parts (120) and the negative electrode connecting part (110) are arranged at intervals along a straight line.

3. The laminated battery according to claim 2, characterized in that: The negative electrode connecting portion (110) is located between the two positive electrode connecting portions (120).

4. The laminated battery according to claim 2, characterized in that: The battery cell body (200) includes at least two negative electrode sheets and at least two positive electrode sheets, all of the positive electrode sheets and all of the negative electrode sheets are alternately stacked, and the side edges of the negative electrode sheets are provided with negative electrode extension sheets, and all of the negative electrode extension sheets are arranged along the stacking direction of the positive electrode sheets and the negative electrode sheets and overlap to form the negative electrode ears (210); the side edges of the positive electrode sheets are provided with first positive electrode extension sheets and second positive electrode extension sheets, all of the first positive electrode extension sheets are arranged along the stacking direction of the positive electrode sheets and the negative electrode sheets and overlap to form one of the positive electrode ears (220), and all of the second positive electrode extension sheets are arranged along the stacking direction of the positive electrode sheets and the negative electrode sheets and overlap to form the other positive electrode ear (220).

5. The laminated battery according to claim 2, characterized in that: The battery cell body (200) includes at least two negative electrode sheets and at least two positive electrode sheets, all of the positive electrode sheets and all of the negative electrode sheets are alternately stacked, and the side edges of the negative electrode sheets are provided with negative electrode extension sheets, and all of the negative electrode extension sheets are arranged along the stacking direction of the positive electrode sheets and the negative electrode sheets and overlap to form the negative electrode ears (210); the side edges of some of the positive electrode sheets are provided with first positive electrode extension sheets, and the side edges of another part of the positive electrode sheets are provided with second positive electrode extension sheets, all of the first positive electrode extension sheets are arranged along the stacking direction of the positive electrode sheets and the negative electrode sheets and overlap to form one of the positive electrode ears (220), and all of the second positive electrode extension sheets are arranged along the stacking direction of the positive electrode sheets and the negative electrode sheets and overlap to form the other positive electrode ears (220).

6. The laminated battery according to claim 1, characterized in that: The battery cell shell (100) comprises a steel shell, the negative electrode connection part (110) is a part of the steel shell, the positive electrode connection part (120) is a positive electrode column, and the positive electrode column is insulated from the steel shell.

7. The laminated battery according to claim 1, characterized in that: The width of the negative electrode tab (210) is A, and the width of the positive electrode tab (220) is B, satisfying A≥B.

8. The laminated battery according to claim 7, characterized in that: The positive electrode tab (220) and the negative electrode tab (210) are both provided with a protective adhesive (230), and the width of the protective adhesive (230) is C, satisfying 30 mm ≥ C > A.

9. The laminated battery according to claim 8, characterized in that: The width C of the protective glue (230) satisfies: 14 mm ≥ C ≥ 8 mm.

10. The laminated battery according to claim 1, characterized in that: The positive electrode lug (220) and the negative electrode lug (210) are both provided with a protective glue (230), the width of the negative electrode lug (210) is A, and the width of the positive electrode lug (220) is B, satisfying B=2 / 3A.

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