Electrode assembly, battery and electric equipment

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to an electrode assembly, a battery and electric equipment, the electrode assembly comprises a main body part and an electrode lug part, the electrode lug part is arranged on the main body part, the main body part is provided with a central hole, and the electrode lug part is arranged along the radial direction of the central hole. The end face of the main body part is provided with a first area and a second area which are adjacent to each other, the tab part positioned in the first area is inclined towards the direction close to the central hole, and the tab part positioned in the second area is inclined towards the direction far away from the central hole; the end face of the electrode assembly is effectively flattened, so that the confluence piece and the end face of the electrode assembly are subsequently welded, meanwhile, after the tab part is rubbed or flattened, the tab part cannot shield the central hole, the liquid injection effect of the battery is effectively ensured, the tab, close to the central hole, of the electrode assembly does not need to be removed, the capacity release of a battery cell is further improved, and the battery efficiency is improved. The battery internal resistance is reduced and the battery performance is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and specifically relates to an electrode assembly, a battery and an electrical device. Background Art

[0002] Cylindrical batteries, especially large-size cylindrical batteries, have relatively high energy density and power performance, and are therefore widely used in consumer electronics, energy storage, new energy vehicles and other fields.

[0003] At present, cylindrical batteries include a shell and an electrode assembly, and the electrode assembly is arranged in the shell. In the prior art, it is generally necessary to flatten the two end faces of the electrode assembly, that is, to flatten the positive and negative ears, so that the busbars can be welded to the end faces of the electrode assembly later. The flattening direction is circumferential from the edge to the center. However, after flattening, the ear blocks the center hole of the electrode assembly, affecting the battery injection. In order to solve the above problems, the ear of the electrode assembly near the center hole is usually removed, but this will increase the internal resistance of the battery and affect the battery performance. Utility Model Content

[0004] The utility model aims to provide an electrode assembly to address the deficiencies of the prior art, so as to solve the problem in the prior art that the central hole of the electrode assembly is blocked after the tab is flattened, thus affecting the liquid injection of the battery.

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

[0006] An electrode assembly includes a main body and a pole ear portion, wherein the pole ear portion is arranged on the main body portion, the main body portion has a center hole, and along the radial direction of the center hole, the end surface of the main body portion has adjacent first and second regions, and the pole ear portion located in the first region is inclined toward a direction close to the center hole, and the pole ear portion located in the second region is inclined toward a direction away from the center hole.

[0007] Preferably, along the radial direction of the central hole, the pole lug portion includes a plurality of pole lug groups, each of the pole lug groups includes a plurality of pole lugs, and the plurality of pole lugs are arranged at intervals along the circumferential direction of the main body portion.

[0008] Preferably, the pole lug portion comprises a first pole lug portion and a second pole lug portion with opposite polarities, the first pole lug portion is located at one end of the main body portion, and the second pole lug portion is located at the other end of the main body portion.

[0009] Preferably, along the radial direction of the central hole, the inclination directions of the first pole lug portion and the second pole lug portion are the same or opposite.

[0010] Preferably, the first region and the second region are symmetrical about a radial line of the central hole.

[0011] Preferably, the main body includes a wound pole piece, the pole piece includes a current collector and an active material layer, the active material layer is arranged on at least one surface of the current collector, and at least a portion of the current collector extends outward from the end of the pole piece to form the pole ear portion.

[0012] Preferably, the current collector comprises a base layer and two conductive layers, the base layer is arranged between the two conductive layers, and the active material layer is arranged on the conductive layer.

[0013] Preferably, the two conductive layers are at least partially conductively connected.

[0014] Another object of the utility model is to provide a battery, comprising a shell, a top cover and the electrode assembly as described above in the specification, wherein the top cover is arranged on the opening of the shell and forms a receiving cavity between the top cover and the shell, the electrode assembly is arranged in the receiving cavity, and a busbar is arranged between the pole ear portion and the top cover and / or the shell.

[0015] Another object of the present invention is to provide an electrical device, comprising the battery described above in the specification.

[0016] The beneficial effect of the utility model is that the electrode assembly of the utility model, through the coordinated use of the main body and the pole ear, has a first region and a second region adjacent to each other along the radial direction of the center hole. The pole ear located in the first region is flattened or patted toward the direction close to the center hole, and the pole ear located in the second region is flattened or patted toward the direction away from the center hole, effectively flattening the end face of the electrode assembly so that the busbar and the end face of the electrode assembly can be welded later. At the same time, after the pole ear is flattened or patted, the pole ear will not block the center hole, effectively ensuring the liquid injection effect of the battery, so there is no need to remove the pole ear near the center hole of the electrode assembly, thereby increasing the release of the battery cell capacity, reducing the internal resistance of the battery, and improving the battery performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

[0018] Figure 1 It is a structural schematic diagram of the battery of the utility model.

[0019] Figure 2 It is a structural schematic diagram of the electrode assembly of the utility model.

[0020] Figure 3 It is a top view of the electrode assembly of the utility model.

[0021] Figure 4 It is a structural schematic diagram of the pole piece of the utility model.

[0022] The reference numerals are described as follows:

[0023] 100. Battery;

[0024] 10. electrode assembly; 11. main body; 111. central hole; 112. first region; 113. second region; 12. pole ear; 121. pole ear; 122. first pole ear; 123. second pole ear; 13. pole piece; 131. current collector; 1311. base layer; 1312. conductive layer; 132. active material layer;

[0025] 20. Shell;

[0026] 30. Top cover; 31. Pole;

[0027] 40. Busbars;

[0028] a. Radial direction of the center hole; b. Circumferential direction of the main body. DETAILED DESCRIPTION

[0029] 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.

[0030] Furthermore, the terms “first”, “second”, etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance.

[0031] In the present invention, 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 present invention can be understood according to specific circumstances.

[0032] In the present invention, the term "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects before and after are in an "or" relationship.

[0033] The term “plurality” used in the present invention refers to more than two (including two).

[0034] The following is combined with Figures 1 to 4 The utility model is further described in detail, but it is not intended to limit the utility model.

[0035] The electric device of the embodiment of the utility model includes a battery 100. The electric device can be a car, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The car can be a fuel car, a gas car or a new energy car, and the new energy car can be a pure electric car, a hybrid car or an extended-range car, etc.; the spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc.; the electric toy includes a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy and an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and a railway electric tool, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator and an electric planer, etc. The embodiment of the present application does not impose any special restrictions on the above-mentioned electric devices.

[0036] See also Figures 1 to 4 The battery 100 of the embodiment of the utility model includes a shell 20, a top cover 30 and an electrode assembly 10. The top cover 30 covers the opening of the shell 20 and forms a receiving cavity between the top cover 30 and the shell 20. The electrode assembly 10 is arranged in the receiving cavity.

[0037] It should be noted that the battery 100 can be one or more. If there are multiple batteries 100, the multiple batteries 100 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple batteries 100 are both connected in series and in parallel. The multiple batteries 100 can be directly connected in series, in parallel, or in mixed connection to form a whole; of course, multiple batteries 100 can also be connected in series, in parallel, or in mixed connection to form a battery module, and then the multiple battery modules can be connected in series, in parallel, or in mixed connection to form a whole.

[0038] See also Figures 1 to 4The electrode assembly 10 of the embodiment of the utility model includes a main body portion 11 and a pole ear portion 12, wherein the pole ear portion 12 is arranged on the main body portion 11, and the main body portion 11 has a center hole 111. Along the radial direction a of the center hole 111, the end surface of the main body portion 11 has adjacent first and second regions 112 and 113, and the pole ear portion 12 located in the first region 112 is inclined toward the direction close to the center hole 111, and the pole ear portion 12 located in the second region 113 is inclined toward the direction away from the center hole 111.

[0039] Compared with the prior art, the electrode assembly 10 of the embodiment of the utility model, through the coordinated use of the main body 11 and the pole ear 12, the end surface of the main body 11 has a first area 112 and a second area 113 adjacent to each other along the radial direction a of the center hole 111, the pole ear 12 located in the first area 112 is flattened or patted toward the direction close to the center hole 111, and the pole ear 12 located in the second area 113 is flattened or patted toward the direction away from the center hole 111, effectively flattening the end surface of the electrode assembly 10, so as to facilitate the subsequent welding of the busbar 40 and the end surface of the electrode assembly 10. At the same time, after the pole ear 12 is flattened or patted, the pole ear 12 will not block the center hole 111, effectively ensuring the injection effect of the battery 100, so there is no need to remove the pole ear 121 of the electrode assembly 10 near the center hole 111, thereby improving the release of the battery cell capacity, reducing the internal resistance of the battery 100, and improving the performance of the battery 100.

[0040] It should be noted that, in order to facilitate the flattening or patting of the pole lugs 12 in the same direction, the pole lugs 12 may be pre-folded in the same direction.

[0041] See also Figure 1 In some embodiments, a busbar 40 is disposed between the pole ear portion 12 and the top cover 30 and / or the housing 20. That is, the pole ear portion 12 can be electrically connected to the top cover 30 and / or the housing 20 through the busbar 40.

[0042] Furthermore, an insulating portion is disposed around the edge of the busbar 40 , which effectively prevents the edge of the busbar 40 from contacting the side wall of the housing 20 and causing a short circuit in the battery 100 .

[0043] Specifically, the top cover 30 and / or the housing 20 are provided with a pole 31, and the pole ear portion 12 can be electrically connected to the pole 31 through a busbar 40. The busbar 40 can be connected to the pole 31 by laser welding or torque welding. Of course, the pole ear portion 12 can also be directly electrically connected to the pole 31.

[0044] See also Figures 1 to 3In some embodiments, along the radial direction a of the central hole 111, the pole lug portion 12 includes a plurality of pole lug groups, and the plurality of pole lugs 121 in each pole lug group are arranged at intervals along the circumferential direction b of the main body 11. By providing a plurality of pole lugs 121, the number of pole lugs 121 is effectively increased, the conductive effect of the battery 100 is improved, and the internal resistance of the battery 100 is reduced.

[0045] See also Figures 1-2 In some embodiments, the pole ear portion 12 includes a first pole ear portion 122 and a second pole ear portion 123 with opposite polarities, wherein the first pole ear portion 122 is located at one end of the main body portion 11, and the second pole ear portion 123 is located at the other end of the main body portion 11. The first pole ear portion 122 and the second pole ear portion 123 can be led out from both ends of the main body portion 11, respectively, so that the pole ear portion 12 is subsequently connected to the busbar 40 or the pole 31. Of course, the first pole ear portion 122 and the second pole ear portion 123 can also be led out on the same side of the main body portion 11.

[0046] It should be noted that one of the first pole lug portion 122 and the second pole lug portion 123 is the positive pole lug 121 , and the other of the first pole lug portion 122 and the second pole lug portion 123 is the negative pole lug 121 .

[0047] See also Figures 1-2 In some embodiments, along the radial direction a of the central hole 111, the first pole ear portion 122 and the second pole ear portion 123 have the same or opposite inclination directions. That is, when the first pole ear portion 122 and the second pole ear portion 123 have the same inclination directions, the first pole ear portion 122 and the second pole ear portion 123 are both inclined toward one side or the other side of the electrode assembly 10; when the first pole ear portion 122 and the second pole ear portion 123 have opposite inclination directions, one of the first pole ear portion 122 and the second pole ear portion 123 is inclined toward one side of the electrode assembly 10, and the other of the first pole ear portion 122 and the second pole ear portion 123 is inclined toward the other side of the electrode assembly 10.

[0048] In actual use, the inclination directions of the first pole lug portion 122 and the second pole lug portion 123 can be set according to actual needs.

[0049] See also Figure 3 In some embodiments, the first region 112 and the second region 113 are symmetrical about the radial line of the central hole 111. In this way, the first region 112 and the second region 113 can be clearly divided from the central axis of the end surface of the main body 11, ensuring that the pole ear portion 12 located in the first region 112 and the pole ear portion 12 located in the second region 113 will not block the central hole 111 after being flattened or patted, effectively ensuring the liquid injection effect of the battery 100.

[0050] It should be noted that the first region 112 and the second region 113 have the same shape and the same area.

[0051] See also Figures 1-2 , Figure 4 In some embodiments, the main body 11 includes a wound pole piece 13, the pole piece 13 includes a current collector 131 and an active material layer 132, the active material layer 132 is arranged on at least one surface of the current collector 131, and at least a portion of the current collector 131 extends outward from the end of the pole piece 13 to form the pole ear portion 12. That is, an empty foil area is reserved at the end of the current collector 131, and after winding, the empty foil area can form the pole ear portion 12 on the end surface of the main body 11. The process of welding the pole ear 121 to the current collector 131 is effectively omitted, thereby reducing the defective rate caused by welding.

[0052] Specifically, the main body 11 further includes a separator, and the pole pieces 13 include a positive pole piece 13 and a negative pole piece 13 . The positive pole piece 13 , the separator, and the negative pole piece 13 are sequentially stacked and wound to form the main body 11 .

[0053] In actual use, the empty foil area can be cut into multiple tabs 121 by cutting or laser cutting to obtain tabs 121 of desired shape and size. This processing method can accurately control the position, shape and size of the tabs 121, better meeting the design requirements of the battery 100 or capacitor. At the same time, the use of laser cutting can also improve production efficiency, reduce production costs, and avoid problems such as material waste and defective rate caused by traditional processing methods.

[0054] Furthermore, the current collector 131 includes a base layer 1311 and two conductive layers 1312, wherein the base layer 1311 is disposed between the two conductive layers 1312, and the active material layer 132 is disposed on the conductive layer 1312. The coordinated use of the base layer 1311 and the conductive layer 1312 can increase the mechanical strength and stability of the battery 100, while the two conductive layers 1312 can provide a more stable current conduction path. Compared with copper foil or aluminum foil, the current collector 131 can effectively reduce the weight of the battery 100, reduce the internal resistance of the battery 100, and improve the energy density and charge and discharge efficiency of the battery 100.

[0055] During actual use, the base layer 1311 is arranged between the two conductive layers 1312, so that both sides of the current collector 131 can be welded. When the pole ear portion 12 is flattened or patted, it can be effectively ensured that both sides of the pole ear portion 12 can be welded, so that in the process of preparing the electrode assembly 10, there is no need to specifically set the orientation of the pole ear portion 12, thereby reducing the difficulty of preparing the electrode assembly 10 and facilitating the subsequent welding of the pole ear portion 12 with the busbar 40 or the pole 31.

[0056] Furthermore, the two conductive layers 1312 are at least partially conductively connected, which effectively increases the current conduction path and improves the conductivity of the pole piece 13 .

[0057] Specifically, a plurality of through holes may be provided on the base layer 1311 , and the through holes may be filled with a conductive material, or the conductive layer 1312 may be at least partially filled in the through holes, thereby effectively ensuring that the two conductive layers 1312 can be conductively connected.

[0058] Of course, the pole ear portion 12 can also be arranged on the empty foil area of ​​the current collector 131 by welding. In this case, the current collector 131 can be the current collector 131 of the above embodiment, or a foil structure. The pole ear portion 12 adopts the structure of the current collector 131 of the above embodiment, which effectively ensures that both sides of the pole ear portion 12 can be welded.

[0059] In some embodiments, the base layer 1311 is one of polyethylene, polypropylene, polyethylene terephthalate and polyimide. The conductive layer 1312 is copper or aluminum.

[0060] According to the disclosure and teaching of the above description, the technicians in the field of the utility model can also change and modify the above implementation. Therefore, the utility model is not limited to the above specific implementation, and any obvious improvement, replacement or modification made by the technicians in this field on the basis of the utility model belongs to the protection scope of the utility model. In addition, although some specific terms are used in this specification, these terms are only for the convenience of explanation and do not constitute any limitation to the utility model.

Claims

1. An electrode assembly, characterized in that: The invention comprises a main body (11) and a pole ear (12), wherein the pole ear (12) is arranged on the main body (11), the main body (11) has a center hole (111), and along the radial direction (a) of the center hole (111), the end face of the main body (11) has a first region (112) and a second region (113) adjacent to each other, and the pole ear (12) located in the first region (112) is inclined toward a direction close to the center hole (111), and the pole ear (12) located in the second region (113) is inclined toward a direction away from the center hole (111).

2. The electrode assembly according to claim 1, characterized in that: Along the radial direction (a) of the central hole (111), the pole lug portion (12) comprises a plurality of pole lug groups, and the plurality of pole lugs (121) in each pole lug group are arranged at intervals along the circumferential direction (b) of the main body portion (11).

3. The electrode assembly according to claim 1, characterized in that: The pole ear portion (12) comprises a first pole ear portion (122) and a second pole ear portion (123) with opposite polarities, wherein the first pole ear portion (122) is located at one end of the main body portion (11), and the second pole ear portion (123) is located at the other end of the main body portion (11).

4. The electrode assembly according to claim 3, characterized in that: Along the radial direction (a) of the central hole (111), the inclination directions of the first pole lug portion (122) and the second pole lug portion (123) are the same or opposite.

5. The electrode assembly according to claim 1, characterized in that: The first region (112) and the second region (113) are symmetrical about a radial line of the central hole (111).

6. The electrode assembly according to claim 1, characterized in that: The main body (11) comprises a wound pole piece (13), the pole piece (13) comprising a current collector (131) and an active material layer (132), the active material layer (132) being arranged on at least one surface of the current collector (131), and at least a portion of the current collector (131) extending outward from an end of the pole piece (13) to form the pole ear portion (12).

7. The electrode assembly according to claim 6, characterized in that: The current collector (131) comprises a base layer (1311) and two conductive layers (1312), wherein the base layer (1311) is arranged between the two conductive layers (1312), and the active material layer (132) is arranged on the conductive layer (1312).

8. The electrode assembly according to claim 7, characterized in that: The two conductive layers (1312) are at least partially conductively connected.

9. A battery, characterized in that: The invention comprises a shell (20), a top cover (30) and an electrode assembly according to any one of claims 1 to 8, wherein the top cover (30) covers the opening of the shell (20) and forms a receiving cavity between the top cover (30) and the shell (20), the electrode assembly (10) is arranged in the receiving cavity, and a busbar (40) is arranged between the pole ear portion (12) and the top cover (30) and / or the shell (20).

10. Electrical equipment, characterized in that: A battery comprising the battery of claim 9.

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