Battery cell, welding tool, battery and power utilization device

Abstract

The utility model relates to the technical field of batteries, and discloses a battery cell, a welding tool, a battery and an electric device, the battery cell comprises a battery cell main body, and a positive inner tab and a negative inner tab are respectively led out from at least two different sides of the battery cell main body; the battery cell main body comprises a first side part and a second side part which are opposite to each other, and the positive inner tab and the negative inner tab are led out from the first side part and the second side part; the welding tool comprises a first welding head and a second welding head, and the distance between the first welding head and the second welding head is matched with the distance between the positive inner tab and the negative inner tab on the same side; compared with the existing technical scheme that a positive tab and a negative tab are led out from the same side or the positive tab and the negative tab are respectively arranged on two opposite sides, the battery cell disclosed by the utility model can realize a shorter current path when being used, so that the battery cell has more uniform current density and a better current collecting effect; and thus, the rate discharge performance and the fast charge performance of the battery can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of battery, especially relates to a battery cell, welding tool, battery and electric device. BACKGROUND

[0002] Lithium ion battery has been widely concerned in social life and has been more and more popular in many fields due to the advantages of high voltage, large capacity, long life cycle, low self-discharge rate and wide working temperature range. The fast charging technology of lithium ion battery can significantly reduce the charging time, improve the satisfaction and convenience of the user, especially in commercial fields such as taxis, fast charging can greatly improve the operation efficiency and economic benefit of the vehicle. The fast charging efficiency of the battery still needs to be improved. SUMMARY

[0003] The utility model provides a kind of battery cell, welding tool, battery and electric device, mainly solve how to improve the technical problem of fast charging efficiency of existing battery.

[0004] To achieve the above object, the utility model provides the following technical scheme:

[0005] A kind of battery cell, including battery cell main body, the battery cell main body includes opposite first side and second side, the first side and the second side are all led out the positive inner tab and the negative inner tab;At least part of the positive inner tab on the first side and at least part of the positive inner tab on the second side are oppositely arranged, and / or, at least part of the negative inner tab on the first side and at least part of the negative inner tab on the second side are oppositely arranged.

[0006] In one of the technical solutions, the battery cell further includes at least two outer tab assemblies, each outer tab assembly is connected with the positive inner tab and the negative inner tab on the corresponding side.

[0007] In one of the technical solutions, the outer tab assembly includes a positive outer tab, a negative outer tab and an insulating piece, one end of the insulating piece is connected to the positive outer tab, the other end of the insulating piece is connected to the negative outer tab, the positive outer tab is connected to the positive inner tab, and the negative outer tab is connected to the negative inner tab.

[0008] In one of the technical solutions, the insulating piece is a hot melt adhesive to be hot melted.

[0009] In one of the technical solutions, the positive outer tab and the negative outer tab each comprise a welding portion, a hot melting portion and an exposed portion connected in sequence in a direction away from the cell body, the welding portion is welded with the positive inner tab or the negative inner tab, one end of the insulating piece is connected to the hot melting portion of the positive outer tab, and the other end of the insulating piece is connected to the hot melting portion of the negative outer tab.

[0010] In one of the technical solutions, the cell further comprises an outer film, the outer film seals and wraps the cell body, all the positive inner tabs and all the negative inner tabs, all the positive outer tabs and all the negative outer tabs each extend relative to the outer film, and the gap between the positive outer tab and the outer film and the gap between the negative outer tab and the outer film are each sealed by the insulating piece.

[0011] In one of the technical solutions, the cell body is in a winding type structure or a laminated type structure.

[0012] The application further provides a welding tool applied to the cell, the welding tool comprising a first welding head and a second welding head, the distance between the first welding head and the second welding head is adapted to the distance between the positive inner tab and the negative inner tab on the same side, the first welding head is used for welding the positive inner tab and the positive outer tab, and the second welding head is used for welding the negative inner tab and the negative outer tab.

[0013] The application further provides a battery comprising a shell and the cell, and the cell is accommodated in the shell.

[0014] The application further provides a power utilization device comprising the battery.

[0015] Compared with the prior art, the cell has at least the following beneficial effects:

[0016] The positive inner tab and the negative inner tab are arranged on each of the plurality of side portions of the cell body, compared with the prior art in which the positive tab and the negative tab are led out on the same side or are arranged on opposite sides, the cell can realize a shorter current path during use, so that the current density is more uniform and the current collecting effect is better, and the performance of battery rate discharge and the performance of fast charging can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to make the technical problems to be solved by the present application, the technical solutions and the beneficial effects clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not used to limit the present application.

[0018] Figure 1 A structural schematic diagram of an electric core provided by the embodiment of the present application is provided.

[0019] Figure 2 A structural exploded view of an electric core provided by the embodiment of the present application is provided.

[0020] Figure 3 A structural schematic diagram of a welding tool when welding the electric core is provided by the embodiment of the present application.

[0021] Reference signs:

[0022] 1, electric core main body; 11, positive inner tab; 12, negative inner tab; 13, first side; 14, second side; 2, outer tab assembly; 21, positive outer tab; 22, negative outer tab; 23, insulating piece; 201, welding part; 202, hot melting part; 203, exposed part; 31, first welding head; 32, second welding head. DETAILED DESCRIPTION

[0023] In order to make the technical problems to be solved by the present application, the technical solutions and the beneficial effects clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not used to limit the present application.

[0024] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0025] It should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0026] In addition, the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" are used only for descriptive purposes and do not denote or imply a relative importance or a specific number of the technical features indicated. Thus, features defined with "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise expressly and specifically limited.

[0027] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the following will be further described in detail with the help of the drawings and examples.

[0028] Please refer to Figure 1 and Figure 2 The utility model discloses a kind of electric core, mainly including electric core main body 1, wherein, electric core main body 1 can be laminated structure, electric core main body 1 can also be winding type structure, electric core main body 1 is at least different two sides and lead out positive inner tab 11 and negative inner tab 12 respectively.Specifically, electric core main body 1 includes a plurality of positive plate, diaphragm and negative plate that are sequentially laminated, wherein diaphragm separates positive plate and negative plate, to prevent internal short circuit of electric core main body 1, each positive plate is at least different two sides and provided with positive tab portion, each positive tab portion is superimposed and welded to form the above-mentioned positive inner tab 11, and the positive inner tab 11 is also called positive inner current collector;Similarly, each negative plate is at least different two sides and provided with negative tab portion, each negative tab portion is superimposed and welded to form the above-mentioned negative inner tab 12, and the positive inner tab 11 is also called negative inner current collector.Specifically, the scheme is provided with positive inner tab 11 and negative inner tab 12 in the multiple side portions of electric core main body 1, compared with the prior art that positive tab and negative tab are led out on the same side or are separately arranged on opposite sides, the electric core of the scheme can realize shorter current path when used, so as to have more uniform current density and better current collecting effect, and then the performance of battery rate discharge and the performance of fast charging can be improved.

[0029] Please refer to Figure 1 and Figure 2 Again, electric core main body 1 includes opposite first side portion 13 and second side portion 14, positive inner tab 11 and negative inner tab 12 are led out on first side portion 13, and positive inner tab 11 and negative inner tab 12 are also led out on second side portion 14, so that electric core main body 1 is led out on opposite two side portions Positive inner tab 11 and negative inner tab 12 are led out, by such design, it can be ensured that shorter current path can be realized when electric core is used, and it can be ensured that more uniform current density and better current collecting effect are had, and then the performance of battery rate discharge and the performance of fast charging can be more beneficially improved.

[0030] Please refer to Figure 1 and Figure 2, preferably, at least part of the positive inner tab 11 on the first side 13 and at least part of the positive inner tab 11 on the second side 14 are oppositely arranged, and / or at least part of the negative inner tab 12 on the first side 13 and at least part of the negative inner tab 12 on the second side 14 are oppositely arranged, by so designing, the current path of the battery cell can be further shortened, and the current density and current collecting effect of the battery cell can be further improved, thereby being beneficial to further improve the performance of the battery rate discharge and the performance of the fast charging. In the embodiment, preferably, the positive inner tab 11 on the first side 13 and the positive inner tab 11 on the second side 14 are preferably arranged to be oppositely aligned, and the negative inner tab 12 on the first side 13 and the negative inner tab 12 on the second side 14 are preferably arranged to be oppositely aligned.

[0031] In other embodiments, the battery cell body 1 can lead out the positive inner tab 11 and the negative inner tab 12 on three, four or more sides respectively.

[0032] Please refer to Figure 1 and Figure 2 , the battery cell further comprises at least two outer tab assemblies 2, the number of the outer tab assemblies 2 is the same as the number of the sides of the battery cell body 1 leading out the positive inner tab 11 and the negative inner tab 12, since the embodiment preferably only sets the positive inner tab 11 and the negative inner tab 12 on the first side 13 and the second side 14, the battery cell of the embodiment preferably only comprises two outer tab assemblies 2, and each outer tab assembly 2 is connected with the positive inner tab 11 and the negative inner tab 12 on the corresponding side. The positive and negative electrical properties of the battery cell are led outwards by the outer tab assembly 2, so as to facilitate charging or discharging of the battery cell.

[0033] Please refer to Figure 1 and Figure 2The outer tab assembly 2 specifically comprises a positive outer tab 21, a negative outer tab 22 and an insulation piece 23, one end of the insulation piece 23 is pre-connected to the positive outer tab 21, the other end of the insulation piece 23 is pre-connected to the negative outer tab 22, the positive outer tab 21 is connected to the positive inner tab 11, and the negative outer tab 22 is connected to the negative inner tab 12. Specifically, the positive outer tab 21 and the negative outer tab 22 of the present scheme correspond to an outer tab assembly 2 pre-formed as a whole by connecting the insulation piece 23. During welding, only the entire outer tab assembly 2 needs to be placed on the corresponding side of the battery core body 1, so that a positive outer tab 21 can be quickly welded on the positive inner tab 11, and a negative outer tab 22 can be quickly welded on the negative inner tab 12, thereby making the battery core have a high welding efficiency even if it has more positive inner tabs 11 and negative inner tabs 12. At the same time that the insulation piece 23 pre-connects the positive outer tab 21 and the negative outer tab 22 as a whole, the insulation property of the insulation piece 23 can prevent the problem of short circuit in the battery core body 1 caused by the positive outer tab 21 and the negative outer tab 22 after being welded on the battery core body 1.

[0034] Please refer to Figure 1 and Figure 2 again, the insulation piece 23 is preferably hot melt glue to be hot melted, and the battery core further comprises an outer film (not shown in the figure), which is preferably an aluminum-plastic film, and is used to wrap the internal battery core body 1 to prevent the internal electrolyte of the battery core body 1 from leaking outward, and also prevent external substances from entering the battery core body 1. In order to realize the discharge of the battery core body 1 to the outside or the charging of the battery core body 1 to the inside, all the positive outer tabs 21 and all the negative outer tabs 22 need to protrude outward relative to the outer film. When the outer film is hot-pressed to seal the internal battery core body 1, the insulation piece 23 is also heated to seal the gap between the outer film and the positive outer tab 21, and the insulation piece 23 is also heated to seal the gap between the outer film and the negative outer tab 22, so as to ensure that the internal electrolyte does not leak outward, and to ensure that external substances do not enter the battery core body 1. As can be seen, in addition to the function of improving the welding efficiency of the positive outer tab 21 and the negative outer tab 22, the insulation piece 23 also has the function of facilitating the sealing of the gap between the positive outer tab 21 and the outer film and the gap between the negative outer tab 22 and the outer film.

[0035] In fact, the positive outer tab 21 and the negative outer tab 22 both comprise a welding portion 201, a hot melting portion 202 and an exposed portion 203 connected in sequence in a direction away from the cell body 1, the welding portion 201 of the positive outer tab 21 is welded with the positive inner tab 11, the welding portion 201 of the negative outer tab 22 is welded with the negative inner tab 12, one end of the insulating piece 23 is connected to the hot melting portion 202 of the positive outer tab 21, one end of the insulating piece 23 is connected to the hot melting portion 202 of the negative outer tab 22, and the exposed portion 203 is exposed outwardly relative to the outer film, so as to enable the cell body 1 to be charged or discharged externally. Through such a design, when the positive outer tab 21 and the negative outer tab 22 are both welded on the corresponding inner tab, and then the positive outer tab 21 and the negative outer tab 22 are hot melted, the welded area will not be affected, ensuring that the positive outer tab 21 can be reliably welded with the positive inner tab 11, and at the same time, ensuring that the negative outer tab 22 can be reliably welded with the negative inner tab 12.

[0036] The embodiment also provides a welding tool, as shown in the drawings. Figure 3 The welding tool comprises a first welding head 31 and a second welding head 32, the distance between the first welding head 31 and the second welding head 32 is adapted to the distance between the positive inner tab 11 and the negative inner tab 12 located on the same side, so that when the first welding head 31 welds the positive inner tab 11 and the positive outer tab 21, the second welding head 32 can also simultaneously weld the negative inner tab 12 and the negative outer tab 22, so that even if the cell has more positive inner tabs 11 and negative inner tabs 12, the cell still has high welding efficiency. For each side of the cell, the welding tool of the embodiment does not need to divide two stations to weld the positive outer tab 21 and the negative outer tab 22 respectively, thereby saving the cost of the welding equipment.

[0037] The embodiment also provides a battery, which comprises a shell (not shown in the drawings) and the above-mentioned cell, the cell is accommodated in the shell, the shell is a hard shell and plays a role of protecting the internal cell, and the shell is usually provided with a positive pole and a negative pole, the positive pole is connected with the positive outer tab 21, and the negative pole is connected with the negative outer tab 22, so as to lead the positive polarity and the negative polarity of the internal cell outward, so as to facilitate the charging or discharging of the cell. The battery of the embodiment has the advantages of uniform current density and fast charging and discharging efficiency, because the above-mentioned cell is used.

[0038] To further illustrate the performance of the battery, the following specific examples and comparative examples are used to illustrate the performance of the battery. The positive and negative electrode sheets of the following examples are made of the same main material, the same slurry ratio and the same compaction density. The slurry on the negative electrode sheet (compaction density: 1.5 g / cm3) includes graphite (96%), SBR (styrene-butadiene rubber) (1.1%), SP (conductive carbon) (1.4%) and CMC (sodium carboxymethyl cellulose) (1.5%), and the slurry on the positive electrode sheet (compaction density: 3.4 g / cm3) includes NCM622 (LiNiCoMnO2) (96.5%), PVDF (polyvinylidene fluoride) (1.5%), SP (conductive carbon) (1.5%) and CNT (carbon nanotube) (0.5%).

[0039] Example 1, laminated soft-pack battery

[0040]

[0041] Example 2, wound soft-pack battery

[0042]

[0043] As can be seen from the above two tables, compared with conventional battery cells, the battery cells of the present application have obvious advantages in fast charging performance and cycle life.

[0044] The present application also provides a power consuming device comprising the battery described above. A plurality of batteries can directly supply power to the power consuming device, or can form a power supply device, such as a battery module, in parallel, series or mixed connection, to supply power to various power consuming devices in the form of a power supply device. The power consuming device can be in various forms, such as a mobile phone, a portable device, a notebook computer, an electric vehicle, an electric vehicle, a ship, a spacecraft, an electric toy, an electric tool or various household appliances, etc. For example, the spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy and an electric plane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and a railway electric tool, such as a power drill, a power grinder, a power wrench, a power screwdriver, a power hammer, an impact drill, a concrete vibrator and a power planer, etc.

[0045] The above are only preferred embodiments of the present application, and only the technical principles of the present application are specifically described, and these descriptions are only for explaining the principles of the present application, and cannot be interpreted as limiting the protection scope of the present application in any way. Based on the explanation herein, any modification, equivalent replacement and improvement made within the spirit and principles of the present application, and other specific embodiments of the present application that can be conceived by those skilled in the art without creative labor, should be included in the protection scope of the present application.

Claims

1. An electric cell, characterized by, The battery cell comprises a cell body (1), the cell body (1) comprises opposite first and second side portions (13, 14), and positive and negative inner tabs (11, 12) are led out from the first and second side portions (13, 14); At least part of the positive inner tabs (11) on the first side portion (13) and at least part of the positive inner tabs (11) on the second side portion (14) are oppositely arranged, and / or at least part of the negative inner tabs (12) on the first side portion (13) and at least part of the negative inner tabs (12) on the second side portion (14) are oppositely arranged.

2. The cell of claim 1, wherein, The battery cell further comprises at least two outer tab assemblies (2), each outer tab assembly (2) is connected with the positive and negative inner tabs (11, 12) on the corresponding side.

3. The cell of claim 2, wherein, The outer tab assembly (2) comprises a positive outer tab (21), a negative outer tab (22) and an insulating piece (23), one end of the insulating piece (23) is connected to the positive outer tab (21), the other end of the insulating piece (23) is connected to the negative outer tab (22), the positive outer tab (21) is connected with the positive inner tab (11), and the negative outer tab (22) is connected with the negative inner tab (12).

4. The cell of claim 3, wherein, The insulating piece (23) is a hot melt adhesive.

5. The cell of claim 4, wherein, The positive and negative outer tabs (21, 22) each comprise a welding portion (201), a hot melting portion (202) and an exposed portion (203) connected in sequence away from the cell body (1), the welding portion (201) is welded with the positive or negative inner tab (11, 12), one end of the insulating piece (23) is connected to the hot melting portion (202) of the positive outer tab (21), and the other end of the insulating piece (23) is connected to the hot melting portion (202) of the negative outer tab (22).

6. The cell of claim 4, wherein, The battery cell further comprises an outer film, the outer film seals and wraps the cell body (1), all the positive outer tabs (21) and all the negative outer tabs (22) protrude relative to the outer film, and the gaps between the positive and negative outer tabs (21, 22) and the outer film are sealed by the insulating piece (23).

7. The cell of claim 1 wherein, The cell body (1) is in a winding type structure or a laminated type structure.

8. A soldering tool characterized by, The welding tool applied to the battery cell of claim 3 comprises a first welding head (31) and a second welding head (32), the distance between the first and second welding heads (31, 32) is adapted to the distance between the positive and negative inner tabs (11, 12) on the same side, the first welding head (31) is used for welding the positive inner tab (11) and the positive outer tab (21), and the second welding head (32) is used for welding the negative inner tab (12) and the negative outer tab (22).

9. A battery, characterized by The battery cell of any one of claims 1 to 7 is contained in the housing.

10. An electrical device, characterized by The battery of claim 9.

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