Battery pole piece, battery cell, battery and electric equipment

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a battery pole piece, a battery cell, a battery and electric equipment, the battery pole piece comprises a pole piece body, a pole lug and a protection piece, the pole piece body is provided with an empty foil area, the pole lug comprises a first part and a second part, the first part is connected with the empty foil area through the second part, and the first part is connected with the empty foil area through the protection piece. The protection piece surrounds the peripheral side of the second part; the protection piece can effectively wrap the corner of the second part, the sharp degree of the corner of the tab is reduced, meanwhile, an empty foil area on the peripheral side of the tab is protected, the situation that the corner of the tab pierces the empty foil area of a pole piece is effectively avoided after a battery cell is manufactured, and then the safety of the battery cell is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and specifically relates to battery pole pieces, battery cores, batteries and electrical equipment. Background Art

[0002] As a new type of secondary battery, lithium-ion battery has the advantages of high energy density and power density, high operating voltage, light weight, small size, long cycle life, good safety, and green environmental protection. It has broad application prospects in portable appliances, power tools, large-scale energy storage, electric transportation power supply, etc.

[0003] At present, the battery includes a pole piece and a diaphragm, wherein the empty foil area of ​​the pole piece is generally provided with a pole ear. The pole ear is the lead-out terminal of the positive and negative electrodes of the battery, and is used to transmit current during the charging and discharging process. The existing pole ear has a relatively high hardness, which ensures that it is not easy to deform or break during the assembly and use of the battery, thereby ensuring the stable transmission of current. The hardness of the empty foil area of ​​the pole piece is relatively low, so as to better contact with the active material and form a good current path. However, due to the difference in hardness between the pole ear and the empty foil area, and the sharp corners of the pole ear, after the battery cell is made, the corners of the pole ear are easy to pierce the empty foil area of ​​the pole piece. Utility Model Content

[0004] The purpose of the utility model is to provide a battery pole piece, a battery cell, a battery and an electrical device in view of the deficiencies in the prior art, so as to solve the technical problem in the prior art that due to the hardness difference between the pole ear and the empty foil area, and the sharp corners of the pole ear, the corners of the pole ear are easy to pierce the empty foil area of ​​the pole piece after the battery is manufactured.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] In a first aspect, the utility model provides a battery pole piece, comprising a pole piece body, a pole ear and a protective member, wherein a hollow foil area is arranged on the pole piece body, the pole ear comprises a first part and a second part, the first part is connected to the hollow foil area through the second part, and the protective member surrounds the circumference of the second part.

[0007] Preferably, on the empty foil area, the orthographic projection of the first part includes an overlapping area and an edge area arranged on at least one side of the overlapping area, the overlapping area coincides with the orthographic projection of the second part on the empty foil area, and within the edge area, the lower surface of the first part, the side surface of the second part and the upper surface of the empty foil area enclose a accommodating space, and the protective member is at least partially located within the accommodating space.

[0008] Preferably, the edge regions are arranged on both sides of the overlapping region, and the edge regions are symmetrically structured with respect to the overlapping region; or, the edge regions are arranged around the overlapping region.

[0009] Preferably, the thickness of the protective member is less than or equal to the height of the accommodating space.

[0010] Preferably, the width of the accommodating space is 0.05-0.5 mm.

[0011] Preferably, the first part and the second part are an integrally formed structure or a split structure.

[0012] Preferably, the protective member is an insulating member.

[0013] In a second aspect, the utility model provides a battery core, comprising the above-mentioned battery pole piece.

[0014] In a third aspect, the utility model provides a battery, comprising the above-mentioned battery cell.

[0015] In a fourth aspect, the utility model provides an electrical device, comprising the above-mentioned battery.

[0016] Compared with the prior art, the beneficial effects achieved by the utility model are:

[0017] The battery pole piece of the utility model is used in conjunction with the pole piece body, the pole ear and the protective member. The pole ear comprises a first part and a second part. The first part is connected to the empty foil area of ​​the pole piece body through the second part, which effectively ensures the current transmission of the battery during the charging and discharging process. By surrounding the protective member on the peripheral side of the second part, the protective member can effectively wrap the corner of the second part, reduce the sharpness of the corner of the pole ear, and at the same time form a protective effect for the empty foil area on the peripheral side of the pole ear. After the battery cell is manufactured, the corner of the pole ear can be effectively prevented from piercing the empty foil area of ​​the pole piece, thereby improving the safety of the battery cell.

[0018] 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

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 It is a structural schematic diagram of the battery pole piece of the utility model.

[0021] Figure 2 It is a side view schematic diagram of the battery pole piece of the utility model.

[0022] Figure 3 This is one of the structural schematic diagrams of the protective element of the utility model.

[0023] Figure 4 This is the second structural schematic diagram of the protective member of the utility model.

[0024] The reference numerals are described as follows:

[0025] 100. Battery pole piece;

[0026] 10. Pole body; 11. Current collector; 111. Empty foil area; 112. Coating area; 12. Active material layer;

[0027] 20. Tab; 21. First part; 211. Overlapping area; 212. Edge area; 22. Second part; 23. Accommodating space;

[0028] 30. Protective parts;

[0029] a. Thickness of the protective part; b. Height of the accommodating space; c. Width of the accommodating space; d. Length of the pole piece body; e. Width of the pole piece body. DETAILED DESCRIPTION

[0030] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0031] Furthermore, the terms “first”, “second”, etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance.

[0032] In the utility model, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to the specific circumstances.

[0033] The following will be combined with the attached Figures 1 to 4The technical solutions in the embodiments of the utility model are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] The electrical equipment of the embodiment of the utility model includes a battery. The electrical equipment may be a car, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The car may be a fuel car, a gas car, or a new energy car, and the new energy car may be a pure electric car, a hybrid car, or an extended-range car, and the like; the spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, and the like; the electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like; the electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, and the like. The embodiment of the present application does not impose any special restrictions on the above-mentioned electrical equipment.

[0035] The battery of the embodiment of the utility model comprises a shell, a top cover and a battery cell. The top cover is arranged on the opening of the shell and forms a receiving space with the shell. The battery cell is arranged in the receiving space.

[0036] The battery cell of the embodiment of the utility model comprises two battery pole pieces 100 and a diaphragm disposed between the two battery pole pieces 100, wherein the diaphragm and the two battery pole pieces 100 are wound together to form a winding structure. The polarities of the two battery pole pieces 100 are opposite, in other words, one of the two battery pole pieces 100 is a positive pole piece, and the other of the two pole pieces is a negative pole piece.

[0037] See also Figures 1 to 4 The battery electrode 100 of the embodiment of the utility model includes a electrode body 10, a pole ear 20 and a protective member 30. The electrode body 10 is provided with an empty foil area 111. The pole ear 20 includes a first part 21 and a second part 22. The first part 21 is connected to the empty foil area 111 through the second part 22. The protective member 30 surrounds the circumference of the second part 22.

[0038] Compared with the prior art, the battery pole piece 100 of the embodiment of the utility model, through the coordinated use of the pole piece body 10, the pole ear 20 and the protective member 30, the pole ear 20 includes a first part 21 and a second part 22, the first part 21 is connected to the empty foil area 111 of the pole piece body 10 through the second part 22, effectively ensuring the current transmission of the battery during the charging and discharging process, by surrounding the protective member 30 on the peripheral side of the second part 22, the protective member 30 can effectively wrap the corner of the second part 22, reduce the sharpness of the corner of the pole ear 20, and at the same time form a protective effect for the empty foil area 111 on the peripheral side of the pole ear 20, after the battery cell is manufactured, it can effectively avoid the corner of the pole ear 20 piercing the empty foil area 111 of the pole piece, thereby improving the safety of the battery cell.

[0039] It should be noted that the battery electrode 100 can be a positive electrode or a negative electrode. Preferably, the battery electrode 100 is a positive electrode.

[0040] See also Figures 2 to 4 In some embodiments, on the empty foil area 111 , the orthographic projection area of ​​the second portion 22 is less than or equal to the orthographic projection area of ​​the first portion 21 .

[0041] When on the empty foil area 111, the orthographic projection area of ​​the second part 22 is equal to the orthographic projection area of ​​the first part 21. At this time, the orthographic projection of the first part 21 on the empty foil area 111 coincides with the orthographic projection of the second part 22 on the empty foil area 111, so that the first part 21 can be connected to the empty foil area 111 through the second part 22, ensuring the current transmission of the battery during the charging and discharging process.

[0042] When on the empty foil area 111, the orthographic projection area of ​​the second part 22 is smaller than the orthographic projection area of ​​the first part 21. At this time, on the empty foil area 111, the orthographic projection of the first part 21 includes an overlapping area 211 and an edge area 212 arranged on at least one side of the overlapping area 211, and the overlapping area 211 coincides with the orthographic projection of the second part 22 on the empty foil area 111. In the edge area 212, the lower surface of the first part 21, the side surface of the second part 22 and the upper surface of the empty foil area 111 enclose a receiving space 23, and the protective member 30 is at least partially located in the receiving space 23. Through the coordinated use of the overlapping area 211 and the edge area 212, the orthographic projections of the overlapping area 211 and the second part 22 on the empty foil area 111 coincide, so that the first part 21 can be connected to the empty foil area 111 through the second part 22, ensuring the current transmission of the battery during the charging and discharging process. The edge area 212 is arranged on at least one side of the overlapping area 211. In the edge area 212, the lower surface of the first part 21, the side surface of the second part 22 and the upper surface of the empty foil area 111 enclose an accommodating space 23. The protective member 30 is at least partially located in the accommodating space 23. The accommodating space 23 can form an escape space for the protective member 30, effectively improving the stability of the connection between the pole ear 20 and the protective member 30 and improving the space utilization. The protective member 30 can provide support for the edge of the first part 21 to ensure the structural stability of the pole ear 20.

[0043] In addition, by providing the edge region 212 , the flow area of ​​the tab 20 can be effectively increased, thereby improving the performance of the battery.

[0044] See also Figures 1 to 4 In some embodiments, the position of the edge area 212 includes at least the following settings:

[0045] When the edge area 212 is arranged on both sides of the overlapping area 211, and the edge area 212 is symmetrical with respect to the overlapping area 211. By setting the edge area 212 as a symmetrical structure, the stability of the structure of the pole lug 20 is effectively ensured, and the stability of the connection between the pole lug 20 and the protective member 30 is improved. Specifically, the edge area 212 can be arranged on both sides of the overlapping area 211 along the length d direction of the pole piece body 10, and can also be arranged on both sides of the overlapping area 211 along the width e direction of the pole piece body 10.

[0046] When the edge area 212 is arranged around the overlapping area 211, the accommodation space 23 formed in the edge area 212 can correspond to the position of the protective member 30, effectively improving the stability of the connection between the tab 20 and the protective member 30 and improving the space utilization.

[0047] See also Figures 3-4In some embodiments, the thickness a of the protective member 30 is less than or equal to the height b of the accommodation space 23. By setting the thickness a of the protective member 30, if the thickness a of the protective member 30 exceeds the height b of the accommodation space 23, when the tab 20 and the protective member 30 are arranged on the empty foil area 111, the protective member 30 will lift the edge of the tab 20, making the surface of the tab 20 uneven, resulting in great difficulty in welding the tab 20. Therefore, setting the thickness a of the protective member 30 less than or equal to the height b of the accommodation space 23 effectively avoids the uneven surface of the tab 20 during the assembly process of the tab 20, the protective member 30 and the pole piece body 10.

[0048] Preferably, the thickness a of the protective member 30 is equal to the height b of the accommodating space 23 . At this time, when the tab 20 and the protective member 30 are cooperatively arranged on the empty foil area 111 , the surface of the tab 20 is flat, which facilitates welding of the tab 20 .

[0049] See also Figures 3-4 In some embodiments, the width c of the accommodating space 23 is 0.05-0.5 mm. By setting the width c of the accommodating space 23, the width c of the accommodating space 23 should not be too large or too small. When the width c of the accommodating space 23 is small, the volume of the accommodating space 23 is small, the space that can accommodate the protective member 30 is small, and the space utilization rate is low; when the width c of the accommodating space 23 is large, the volume of the accommodating space 23 is large, and the accommodating space 23 occupies a larger area in the empty foil area 111, so that the second part 22 occupies a smaller area in the empty foil area 111, thereby affecting the conductive performance of the tab 20.

[0050] Furthermore, the width c of the accommodating space 23 is less than or equal to the width of the protective member 30 , so as to ensure that the protective member 30 can support the edge of the first portion 21 , so that the surface of the tab 20 is flat, and the welding of the tab 20 is facilitated.

[0051] In some embodiments, the first part 21 and the second part 22 are an integrally formed structure or a split structure. When the first part 21 and the second part 22 are an integrally formed structure, that is, the first part 21 and the second part 22 are one component, the structural stability and structural strength of the tab 20 are effectively guaranteed; when the first part 21 and the second part 22 are a split structure, that is, the first part 21 and the second part 22 are two separate components, the difficulty of assembling the tab 20 and the protective member 30 is effectively reduced.

[0052] In some embodiments, the protective member 30 is an insulating member, which effectively avoids short circuit of the battery cell and improves the safety of the battery.

[0053] Specifically, the insulating member is rubber, PP or PE.

[0054] See also Figures 1-2In some embodiments, the pole piece body 10 includes a current collector 11 and an active material layer 12 , the current collector 11 is provided with a coating area 112 and the empty foil area 111 of the above embodiment, and the active material layer 12 is provided on the coating area 112 .

[0055] See also Figures 1-2 In some embodiments, the battery electrode 100 further includes insulating tape, which is disposed on the active material layer 12 and covers the empty foil area 111. By providing the insulating tape, the burrs and puncture of the diaphragm after the electrode tab 20 is welded can be effectively avoided, thereby preventing the electrode assembly from short-circuiting.

[0056] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

Claims

1. A battery electrode, Features: The invention comprises a pole piece body (10), a pole ear (20) and a protective member (30); the pole piece body (10) is provided with a hollow foil area (111); the pole ear (20) comprises a first part (21) and a second part (22); the first part (21) is connected to the hollow foil area (111) via the second part (22); and the protective member (30) surrounds the circumference of the second part (22).

2. The battery pole piece according to claim 1, Features: On the empty foil area (111), the orthographic projection of the first part (21) comprises an overlapping area (211) and an edge area (212) arranged on at least one side of the overlapping area (211); the overlapping area (211) coincides with the orthographic projection of the second part (22) on the empty foil area (111); within the edge area (212), the lower surface of the first part (21), the side surface of the second part (22) and the upper surface of the empty foil area (111) enclose a containing space (23); and the protective member (30) is at least partially located within the containing space (23).

3. The battery pole piece according to claim 2, Features: The edge region (212) is arranged on both sides of the overlapping region (211), and the edge region (212) is symmetrically structured with respect to the overlapping region (211); or, the edge region (212) is arranged around the overlapping region (211).

4. The battery pole piece according to claim 2, Features: The thickness (a) of the protective member (30) is less than or equal to the height (b) of the accommodating space (23).

5. The battery pole piece according to claim 2, Features: The width (c) of the accommodating space (23) is 0.05-0.5 mm.

6. The battery electrode according to any one of claims 1 to 5, Features: The first part (21) and the second part (22) are an integrally formed structure or a split structure.

7. The battery electrode according to any one of claims 1 to 5, Features: The protective member (30) is an insulating member.

8. A battery cell, Features: A battery electrode comprising the battery electrode according to any one of claims 1 to 7.

9. A battery, Features: Comprising the battery cell as claimed in claim 8.

10. An electrical device, Features: A battery comprising the battery of claim 9.

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