Electrode assembly structure and battery

Abstract

The utility model provides a kind of electrode assembly structure and battery, electrode assembly structure includes electrode group and the insulating tape being set on the surface of electrode group;Electrode group has bottom surface and top surface, and two oppositely arranged side surfaces, top surface is the end surface of electrode group and has tab, two side surfaces are respectively the two side surfaces of the thickness direction of electrode group;Insulating tape includes first binding part, second binding part, third binding part and fourth binding part being connected;One of first binding part and third binding part is located at top surface, another of first binding part and third binding part is located at bottom surface;Second binding part is located on one side surface, and fourth binding part is located on another side surface;Wherein, at least one of first binding part and third binding part includes base material layer, and does not include adhesive layer.The utility model solves the problem that the cell of the battery structure in the prior art is prone to wrinkling due to the expansion or contraction of the pole piece and / or the separator during charging and discharging.

Description

Technical Field

[0001] This utility model relates to the field of energy storage equipment technology, and more specifically, to an electrode assembly structure and a battery. Background Technology

[0002] A battery typically includes a casing and an electrode assembly located within the casing. The electrode assembly includes a positive electrode, a negative electrode, and a separator. The structure of the electrode assembly also includes wound and stacked types. The wound type involves sequentially winding the positive electrode, separator, and negative electrode using the winding needles of a winding machine and shaping them by hot pressing. The stacked electrode assembly is formed by stacking the positive electrode, negative electrode, and separator using a stacking machine.

[0003] However, during the charging and discharging process, the positive electrode, negative electrode, and separator of the existing electrode assembly expand and contract. Since the expansion or contraction at different locations is not completely consistent, the stress on the positive electrode, negative electrode, and separator at different locations is uneven, which leads to the formation of wrinkles during the expansion or contraction process. Utility Model Content

[0004] The main objective of this invention is to provide an electrode assembly structure and a battery to solve the problem that in the prior art, the battery cells are prone to wrinkling during charging and discharging due to the expansion or contraction of the electrode sheets and / or the separator.

[0005] To achieve the above objectives, according to one aspect of the present invention, an electrode assembly structure is provided, comprising an electrode group and an insulating strip disposed on the surface of the electrode group; the electrode group has a bottom surface and a top surface, and two opposing side surfaces, wherein the top surface is the end surface of the electrode group extending from which the tabs are located, and the two side surfaces are the two sides of the electrode group in the thickness direction; the insulating strip includes a first binding portion, a second binding portion, a third binding portion, and a fourth binding portion connected together; one of the first binding portion and the third binding portion is located on the top surface, and the other of the first binding portion and the third binding portion is located on the bottom surface; the second binding portion is located on one side surface, and the fourth binding portion is located on the other side surface; wherein at least one of the first binding portion and the third binding portion includes a substrate layer and does not include an adhesive layer.

[0006] In an exemplary embodiment, the insulating tape is ring-shaped and further includes a fifth binding portion. One end of the fifth binding portion is connected to the fourth binding portion, and the other end of the fifth binding portion is connected to the surface of the first binding portion opposite to the electrode assembly. The first binding portion, the second binding portion, the third binding portion, the fourth binding portion, and the fifth binding portion are integrally formed.

[0007] In an exemplary embodiment, the second binding portion, the fourth binding portion, and the fifth binding portion each independently include a substrate layer and an adhesive layer disposed on one side of the substrate layer; wherein, the adhesive layers of the second binding portion and the fourth binding portion are disposed facing their respective sides and are respectively glued to their respective sides; the adhesive layer of the fifth binding portion is disposed facing the surface of the first binding portion away from the electrode group and is glued to the surface of the first binding portion away from the electrode group.

[0008] In an exemplary embodiment, the electrode includes a positive electrode and a negative electrode; a first binding portion disposed on the top surface is located between the positive electrode and the negative electrode; or, a third binding portion disposed on the top surface is located between the positive electrode and the negative electrode.

[0009] In an exemplary embodiment, the distance between the first binding portion on the top surface and the positive electrode tab is in the range of 3 to 7 mm; the distance between the first binding portion on the top surface and the negative electrode tab is in the range of 3 to 7 mm; or, the distance between the third binding portion on the top surface and the positive electrode tab is in the range of 3 to 7 mm; the distance between the third binding portion on the top surface and the negative electrode tab is in the range of 3 to 7 mm.

[0010] In an exemplary embodiment, the electrode assembly is a wound electrode assembly, and the electrode assembly includes a straight portion and arc-shaped portions located on both sides of the straight portion in the width direction of the electrode assembly; wherein, in the width direction of the electrode assembly, the distance between the two sides of the second binding portion and the corresponding arc-shaped portion is in the range of 3 to 10 mm; and / or, in the width direction of the electrode assembly, the distance between the two sides of the fourth binding portion and the corresponding arc-shaped portion is in the range of 3 to 10 mm.

[0011] In an exemplary embodiment, the substrate layer of the first binding portion, the second binding portion, the third binding portion, the fourth binding portion, and the fifth binding portion is made of plastic.

[0012] In one exemplary embodiment, the adhesive layers of the second, fourth, and fifth binding portions are made of pressure-sensitive adhesive and insulating adhesive, respectively.

[0013] In one exemplary embodiment, the electrode group includes one electrode assembly; or, the electrode group includes at least two electrode assemblies stacked along the thickness direction of the electrode group.

[0014] According to another aspect of the present invention, a battery is provided, including the electrode assembly structure described above.

[0015] The present invention provides an electrode assembly structure comprising an electrode group and an insulating strip disposed on the surface of the electrode group. The electrode group has a bottom surface and a top surface, as well as two opposing side surfaces. The top surface is the end surface of the electrode group extending from which the tabs are located, and the two side surfaces are the two sides of the electrode group in the thickness direction. The insulating strip includes a first binding portion, a second binding portion, a third binding portion, and a fourth binding portion connected together. One of the first binding portion and the third binding portion is located on the top surface, and the other of the first binding portion and the third binding portion is located on the bottom surface. The second binding portion is located on one side surface, and the fourth binding portion is located on the other side surface. At least one of the first binding portion and the third binding portion includes a substrate layer and does not include an adhesive layer.

[0016] By configuring the insulating tape into a structure comprising a first binding portion, a second binding portion, a third binding portion, and a fourth binding portion connected together, with one of the first and third binding portions located on the top surface and the other on the bottom surface; the second binding portion is located on one side and the fourth binding portion is located on the other side, the insulating tape can exert a certain binding force on the electrode assembly during charging and discharging, preventing the electrode assembly from undergoing large deformation, and thus reducing the degree of wrinkling of the electrode sheets and / or diaphragms in the electrode assembly.

[0017] Furthermore, since at least one of the first and third binding portions includes a substrate layer but not an adhesive layer, this means that the first and / or third binding portions lack adhesive force; that is, no adhesive is formed between the first binding portion and the top surface, and / or the third binding portion and the bottom surface. Typically, the electrode assembly experiences the greatest expansion force in its thickness direction; therefore, no adhesive layer is provided on the first and / or third binding portions. With this configuration, during the expansion of the electrode assembly in its thickness direction, at the beginning of expansion, the substrate layer of the first and / or third binding portions can possess a certain binding force to prevent excessive expansion of the electrode assembly. As expansion progresses, the expansion force continuously increases, and in the later stages of expansion, when the expansion force of the electrode assembly is relatively large and exceeds the binding force, due to the absence of an adhesive layer, the first and / or third binding portions can undergo relatively free elastic deformation. The force generated by this elastic deformation can further bind the expansion of the electrode assembly, and this elastic deformation can absorb a portion of the expansion force of the electrode assembly, thereby further reducing the degree of wrinkling of the electrode sheet and / or diaphragm. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0019] Figure 1 A top surface view of an electrode assembly structure according to an alternative embodiment of the present invention is shown in the diagram.

[0020] Figure 2 It shows Figure 1 A schematic diagram of the electrode assembly structure from the perspective of the arc-shaped side surface;

[0021] Figure 3 It shows Figure 1 A bottom-view structural diagram of the electrode assembly structure;

[0022] Figure 4 It shows Figure 1 A schematic diagram of the electrode assembly structure in the image;

[0023] Figure 5 It shows Figure 4 A schematic diagram of the electrode assembly from the bottom view.

[0024] The above figures include the following reference numerals:

[0025] 10. Electrode assembly; 11. Positive tab; 12. Negative tab; 13. Electrode assembly; 101. Bottom surface; 102. Top surface; 103. Side surface; 1001. Straight section; 1002. Curved section;

[0026] 20. Insulating tape; 21. First binding part; 22. Second binding part; 23. Third binding part; 24. Fourth binding part. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0028] To address the problem that existing battery cell structures are prone to wrinkling of electrodes and / or separators during charging and discharging due to expansion or contraction, this invention provides an electrode assembly structure and a battery.

[0029] In one aspect of this application, such as Figures 1 to 5As shown, the electrode assembly structure includes an electrode group 10 and an insulating strip 20 disposed on the surface of the electrode group 10. The electrode group 10 has a bottom surface 101 and a top surface 102, as well as two opposing side surfaces 103. The top surface 102 is the end face of the electrode group 10 with tabs extending out, and the two side surfaces 103 are the two side surfaces of the electrode group 10 in the thickness direction. The insulating strip 20 includes a first binding portion 21, a second binding portion 22, a third binding portion 23, and a fourth binding portion 24 connected to each other. One of the first binding portion 21 and the third binding portion 23 is located on the top surface 102, and the other of the first binding portion 21 and the third binding portion 23 is located on the bottom surface 101. The second binding portion 22 is located on one of the side surfaces 103, and the fourth binding portion 24 is located on the other side surface 103. At least one of the first binding portion 21 and the third binding portion 23 includes a substrate layer and does not include an adhesive layer.

[0030] By configuring the insulating tape 20 into a structure comprising a first binding portion 21, a second binding portion 22, a third binding portion 23, and a fourth binding portion 24 connected together, with one of the first binding portion 21 and the third binding portion 23 located on the top surface 102 and the other of the first binding portion 21 and the third binding portion 23 located on the bottom surface 101; the second binding portion 22 located on one side surface 103 and the fourth binding portion 24 located on the other side surface 103, the insulating tape 20 can generate a certain binding force on the electrode assembly 10 during charging and discharging, preventing the electrode assembly 10 from undergoing large deformation, thus reducing the degree of wrinkling of the electrode sheets and / or diaphragms in the electrode assembly 10.

[0031] Furthermore, since at least one of the first binding portion 21 and the third binding portion 23 includes a substrate layer but not an adhesive layer, this means that the first binding portion 21 and / or the third binding portion 23 lacks adhesive force; that is, no adhesive is formed between the first binding portion 21 and the top surface 102, and / or, no adhesive is formed between the third binding portion 23 and the bottom surface 101. Typically, the electrode assembly 10 has the greatest expansion force in its thickness direction. Therefore, no adhesive layer is provided on the first binding portion 21 and / or the third binding portion 23. Consequently, the first binding portion 21 and / or the third binding portion 23 actually deforms along the thickness direction of the electrode assembly 10. With this configuration, when the electrode assembly 10 expands in its thickness direction, at the beginning of the expansion, the substrate layer of the first binding part 21 and / or the third binding part 23 can have a certain binding force to prevent the electrode assembly 10 from expanding too much. As the expansion proceeds, the expansion force continuously increases, and in the later stage of the expansion, when the expansion force of the electrode assembly 10 is relatively large and greater than the binding force, since there is no adhesive layer, the first binding part 21 and / or the third binding part 23 can elastically deform relatively freely. The force brought about by the elastic deformation can further bind the expansion of the electrode assembly 10, and this elastic deformation can absorb part of the expansion force of the electrode assembly 10, thereby further reducing the degree of wrinkles generated by the electrode sheet and / or diaphragm.

[0032] It should be noted that existing insulating tapes have adhesive layers on both the top and bottom surfaces of the electrode assembly 10. As a result, in the later stages of the expansion of the electrode assembly 10, when the expansion force of the electrode assembly 10 is greater than the binding force of the insulating tape, the presence of the adhesive layer restricts the expansion of the electrode assembly 10 in the thickness direction. This makes the electrode sheets and / or diaphragms of the electrode assembly 10 more prone to wrinkling. Based on this, this application proposes that at least one of the first binding portion 21 and the third binding portion 23 includes a substrate layer but does not include an adhesive layer.

[0033] It should be noted that, in this application, the thickness direction of the electrode assembly 10 is as follows: Figure 4 In the X direction, the width direction of electrode group 10 is shown in the figure. Figure 4 The Y-direction and the height direction of electrode group 10 are shown in the figure. Figure 4 The Z direction in the equation.

[0034] In some embodiments, the insulating tape 20 is ring-shaped and further includes a fifth binding portion. One end of the fifth binding portion is connected to the fourth binding portion 24, and the other end of the fifth binding portion is connected to the surface of the first binding portion 21 facing away from the electrode assembly 10. The first binding portion 21, the second binding portion 22, the third binding portion 23, the fourth binding portion 24, and the fifth binding portion are integrally formed. Thus, by setting the insulating tape 20 as a ring-shaped insulating tape, its closed-loop structure provides better binding effect on the electrode assembly 10 and more uniform binding force.

[0035] In some embodiments, the second binding portion 22, the fourth binding portion 24, and the fifth binding portion each independently include a substrate layer and an adhesive layer disposed on one side of the substrate layer; wherein the adhesive layers of the second binding portion 22 and the fourth binding portion 24 are disposed facing their respective side surfaces 103 and are respectively adhesively bonded to their respective side surfaces 103; the adhesive layer of the fifth binding portion is disposed facing the surface of the first binding portion 21 opposite to the electrode assembly 10 and is adhesively bonded to the surface of the first binding portion 21 opposite to the electrode assembly 10. This ensures reliable bonding between the second binding portion 22 and the first side surface 103, and also ensures reliable bonding between the fourth binding portion 24 and the second side surface 103.

[0036] In some embodiments, the electrode tabs include a positive electrode tab 11 and a negative electrode tab 12; a first binding portion 21 disposed on the top surface 102 is located between the positive electrode tab 11 and the negative electrode tab 12; or, a third binding portion 23 disposed on the top surface 102 is located between the positive electrode tab 11 and the negative electrode tab 12. Thus, the first binding portion 21 is provided to fully utilize the space between the positive electrode tab 11 and the negative electrode tab 12; or, the third binding portion 23 is provided to fully utilize the space between the positive electrode tab 11 and the negative electrode tab 12.

[0037] In some embodiments, the distance between the first binding portion 21 on the top surface 102 and the positive electrode tab 11 is in the range of 3 to 7 mm; the distance between the first binding portion 21 on the top surface 102 and the negative electrode tab 12 is in the range of 3 to 7 mm. This helps to avoid interference between the two side edges of the first binding portion 21 on the top surface 102 and the positive electrode tab 11 and the negative electrode tab 12, respectively.

[0038] It should be noted that, in an embodiment not shown in this application, the distance between the third binding portion 23 on the top surface 102 and the positive electrode tab 11 ranges from 3 to 7 mm; the distance between the third binding portion 23 on the top surface 102 and the negative electrode tab 12 also ranges from 3 to 7 mm. This helps to avoid interference between the two side edges of the third binding portion 23 on the top surface 102 and the positive electrode tab 11 and the negative electrode tab 12.

[0039] In some embodiments, the electrode assembly 10 is a wound electrode assembly, and the electrode assembly 10 includes a straight portion 1001 and arc-shaped portions 1002 located on both sides of the straight portion 1001 in the width direction of the electrode assembly 10; wherein, in the width direction of the electrode assembly 10, the distance between each side of the second binding portion 22 and the corresponding arc-shaped portion 1002 is in the range of 3 to 10 mm; and / or, in the width direction of the electrode assembly 10, the distance between each side of the fourth binding portion 24 and the corresponding arc-shaped portion 1002 is in the range of 3 to 10 mm. This is beneficial to ensuring the bonding reliability of the second binding portion 22 to the first side surface 103 located on the straight portion 1001; and / or, it is beneficial to ensure the bonding reliability of the fourth binding portion 24 to the second side surface 103 located on the straight portion 1001.

[0040] In some embodiments, the substrate layer of the first binding part 21, the second binding part 22, the third binding part 23, the fourth binding part 24 and the fifth binding part are all made of plastic.

[0041] Optionally, the plastic material of the substrate layer includes at least one of polyethylene terephthalate (PET), polyethylene (PE), and polyimide (PI).

[0042] In some embodiments, the adhesive layers of the second binding portion 22, the fourth binding portion 24, and the fifth binding portion are made of pressure-sensitive adhesive and insulating adhesive, respectively.

[0043] In some embodiments, electrode group 10 includes an electrode assembly 13.

[0044] In some embodiments, the electrode assembly 10 includes at least two electrode components 13, which are stacked along the thickness direction of the electrode assembly 10.

[0045] It is understood that when the electrode assembly 10 includes an electrode component 13, "the bottom surface 101 and top surface 102 that are arranged opposite to each other, and the two side surfaces 103 that are arranged opposite to each other along the thickness direction" are the bottom surface, top surface, and two side surfaces of the electrode component 13. The top surface of the electrode component 13 is the end surface of the electrode component that extends out with the tab, and naturally the bottom surface of the electrode component 13 is the surface that is arranged opposite to the top surface.

[0046] It is understood that when the electrode assembly 10 includes at least two electrode components 13, the at least two electrode components 13 are stacked along their thickness direction; wherein each electrode component 13 includes: a bottom surface and a top surface disposed opposite each other, and two side surfaces disposed opposite each other along the thickness direction of the electrode component 13. It is understood that "at least two electrode components 13 are stacked along their thickness direction" means that the side surfaces of at least two electrode components 13 abut against each other. Then, the bottom surfaces of at least two electrode components 13 together form the bottom surface 101 of the electrode assembly 10, and the top surfaces of at least two electrode components 13 together form the top surface 102 of the electrode assembly 10; along the thickness direction of the electrode assembly 10, the side surfaces of the two outermost electrode components 13 that do not abut against the adjacent electrode components 13 respectively form the side surfaces 103 of the electrode assembly 10.

[0047] Furthermore, the aforementioned insulating strip 20 is disposed around the outer periphery of the plurality of electrode assemblies 13 along the stacking direction of the plurality of electrode assemblies 13.

[0048] like Figures 1 to 3 As shown, the length of the binding portion located at at least one of the first side surface 103, the bottom surface 101, and the second side surface 103 is greater than the length of the binding portion located on the top surface 102.

[0049] By setting the length of the binding portion at at least one of the first side 103, bottom 101, and second side 103 to be greater than the length of the binding portion at the top 102, the electrode assembly structure can provide sufficient binding force to at least one of the first side 103, bottom 101, and second side 103 when the positive electrode and / or negative electrode expand under charging and discharging conditions. This ensures the uniformity of force at at least one of the first side 103, bottom 101, and second side 103 of the electrode assembly structure, thereby helping to prevent the positive electrode and / or negative electrode from undergoing large deformation due to expansion, and thus ensuring that the positive electrode and negative electrode do not wrinkle as much as possible.

[0050] It should be noted that, in this application, at least the side edge of the second binding portion 22 facing the top surface 102 of the electrode assembly 10 is flush with the edge of the diaphragm of the electrode assembly 10 facing the top surface 102 of the electrode assembly 10; and / or, at least the side edge of the fourth binding portion 24 facing the top surface 102 of the electrode assembly 10 is flush with the edge of the diaphragm of the electrode assembly 10 facing the top surface 102 of the electrode assembly 10. This facilitates ensuring that the insulating tape 20 effectively binds the thinned area of ​​the electrode sheet (the thinned area is thinner than the correct area of ​​the electrode sheet). Furthermore, under the pulling force of the first binding portion 21 or the fourth binding portion 24, the second binding portion 22 and the fourth binding portion 24 also exert a binding force on the thinned area of ​​the electrode sheet.

[0051] It should be noted that, in this application, at least the third binding part 23 is an elastic element. Thus, the third binding part 23 is non-adhesive and possesses elasticity, enabling elastic deformation. During the charging and discharging process of the electrode assembly structure, when the positive and / or negative electrode plates expand, the top surface 102, the first side surface 103, and the second side surface 103 of the electrode assembly structure minimize deformation under the binding forces of their respective first binding part 21, second binding part 22, and fourth binding part 24. The elastic third binding part 23 can deform and absorb the deformation, thereby ensuring the uniformity of force on the positive and negative electrode plates and preventing wrinkles due to uneven force distribution.

[0052] On the other hand, this utility model also provides a battery including the above-described electrode assembly structure.

[0053] The present invention provides an electrode assembly structure, including an electrode group 10 and an insulating strip 20 disposed on the surface of the electrode group 10. The electrode group 10 has a bottom surface 101 and a top surface 102, and two opposing side surfaces 103. The top surface 102 is the end surface of the electrode group 10 with tabs extending out, and the two side surfaces 103 are the two side surfaces of the electrode group 10 in the thickness direction. The insulating strip 20 includes a first binding portion 21, a second binding portion 22, a third binding portion 23, and a fourth binding portion 24 connected to each other. One of the first binding portion 21 and the third binding portion 23 is located on the top surface 102, and the other of the first binding portion 21 and the third binding portion 23 is located on the bottom surface 101. The second binding portion 22 is located on one of the side surfaces 103, and the fourth binding portion 24 is located on the other side surface 103. At least one of the first binding portion 21 and the third binding portion 23 includes a substrate layer and does not include an adhesive layer.

[0054] By configuring the insulating tape 20 into a structure comprising a first binding portion 21, a second binding portion 22, a third binding portion 23, and a fourth binding portion 24 connected together, with one of the first binding portion 21 and the third binding portion 23 located on the top surface 102 and the other of the first binding portion 21 and the third binding portion 23 located on the bottom surface 101; the second binding portion 22 located on one side surface 103 and the fourth binding portion 24 located on the other side surface 103, the insulating tape 20 can generate a certain binding force on the electrode assembly 10 during charging and discharging, preventing the electrode assembly 10 from undergoing large deformation, thus reducing the degree of wrinkling of the electrode sheets and / or diaphragms in the electrode assembly 10.

[0055] Furthermore, since at least one of the first binding portion 21 and the third binding portion 23 includes a substrate layer but not an adhesive layer, this means that the first binding portion 21 and / or the third binding portion 23 lacks adhesive force; that is, no adhesive is formed between the first binding portion 21 and the top surface 102, and / or, no adhesive is formed between the third binding portion 23 and the bottom surface 101. Typically, the electrode assembly 10 has the greatest expansion force in its thickness direction; therefore, no adhesive layer is provided on the first binding portion 21 and / or the third binding portion 23. With this configuration, when the electrode assembly 10 expands in its thickness direction, at the beginning of the expansion, the substrate layer of the first binding part 21 and / or the third binding part 23 can have a certain binding force to prevent the electrode assembly 10 from expanding too much. As the expansion proceeds, the expansion force continuously increases, and in the later stage of the expansion, when the expansion force of the electrode assembly 10 is relatively large and greater than the binding force, since there is no adhesive layer, the first binding part 21 and / or the third binding part 23 can elastically deform relatively freely. The force brought about by the elastic deformation can further bind the expansion of the electrode assembly 10, and this elastic deformation can absorb part of the expansion force of the electrode assembly 10, thereby further reducing the degree of wrinkles generated by the electrode sheet and / or diaphragm.

[0056] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0057] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0058] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0059] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0060] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0061] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An electrode assembly structure, characterized in that, include: Electrode assembly (10) and insulating strip (20) disposed on the surface of the electrode assembly (10); The electrode assembly (10) has a bottom surface (101) and a top surface (102), as well as two oppositely arranged side surfaces (103). The top surface (102) is the end surface of the electrode assembly (10) with tabs extending out, and the two side surfaces (103) are the two side surfaces of the electrode assembly (10) in the thickness direction. The insulating tape (20) includes a first binding part (21), a second binding part (22), a third binding part (23), and a fourth binding part (24) connected to each other; One of the first binding part (21) and the third binding part (23) is located on the top surface (102), and the other of the first binding part (21) and the third binding part (23) is located on the bottom surface (101); the second binding part (22) is located on one of the side surfaces (103), and the fourth binding part (24) is located on the other side surface (103); At least one of the first binding portion (21) and the third binding portion (23) includes a substrate layer but does not include an adhesive layer.

2. The electrode assembly structure according to claim 1, characterized in that, The insulating tape (20) is ring-shaped, and the insulating tape (20) further includes: The fifth binding part has one end connected to the fourth binding part (24) and the other end connected to the surface of the first binding part (21) on the side away from the electrode group (10). The first binding part (21), the second binding part (22), the third binding part (23), the fourth binding part (24) and the fifth binding part are integrally formed.

3. The electrode assembly structure according to claim 2, characterized in that, The second binding part (22), the fourth binding part (24) and the fifth binding part each independently include a substrate layer and an adhesive layer disposed on one side of the substrate layer; The adhesive layers of the second binding part (22) and the fourth binding part (24) are both disposed facing the corresponding side surface (103) and are respectively glued to the corresponding side surface (103); The adhesive layer of the fifth binding part is disposed on the surface of the first binding part (21) facing away from the electrode group (10), and is adhesively connected to the surface of the first binding part (21) facing away from the electrode group (10).

4. The electrode assembly structure according to claim 1, characterized in that, The electrode includes a positive electrode (11) and a negative electrode (12); The first binding portion (21) disposed on the top surface (102) is located between the positive electrode tab (11) and the negative electrode tab (12); or, The third binding part (23) disposed on the top surface (102) is located between the positive electrode tab (11) and the negative electrode tab (12).

5. The electrode assembly structure according to claim 4, characterized in that, The distance between the first binding part (21) and the positive electrode ear (11) on the top surface (102) is in the range of 3 to 7 mm; The distance between the first binding part (21) on the top surface (102) and the negative electrode tab (12) ranges from 3 to 7 mm; or, The distance between the third binding part (23) and the positive electrode ear (11) on the top surface (102) is 3 to 7 mm. The distance between the third binding part (23) and the negative electrode ear (12) located on the top surface (102) is 3 to 7 mm.

6. The electrode assembly structure according to claim 1, characterized in that, The electrode assembly (10) is a wound electrode assembly, and the electrode assembly (10) includes: Straight section (1001); Arc-shaped portions (1002) located on both sides of the straight portion (1001) in the width direction of the electrode group (10); Wherein, in the width direction of the electrode group (10), the distance between each side of the second binding portion (22) and the corresponding arc-shaped portion (1002) ranges from 3 to 10 mm; and / or, In the width direction of the electrode group (10), the distance between the two sides of the fourth binding part (24) and the corresponding arc-shaped part (1002) is in the range of 3 to 10 mm.

7. The electrode assembly structure according to claim 2, characterized in that, The base material of the first binding part (21), the second binding part (22), the third binding part (23), the fourth binding part (24) and the fifth binding part is plastic.

8. The electrode assembly structure according to claim 2, characterized in that, The adhesive layers of the second binding part (22), the fourth binding part (24), and the fifth binding part are made of pressure-sensitive adhesive and insulating adhesive, respectively.

9. The electrode assembly structure according to claim 1, characterized in that, The electrode group (10) includes an electrode assembly (13); or, The electrode group (10) includes at least two electrode components (13), and the at least two electrode components (13) are stacked along the thickness direction of the electrode group (10).

10. A battery, characterized in that, The electrode assembly structure includes any one of claims 1-9.

Images