Battery cell
By designing different adhesive adhesion forces for fixing components within the battery cell, the problem of unreleased electrode stress during battery expansion is solved, enabling timely stress release after expansion, preventing electrode breakage, and improving battery safety.
Patent Information
- Application Number
- CN202422419945.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-08
- Publication Date
- 2025-10-24
- Estimated Expiration
- 2034-10-08
AI Technical Summary
In existing technologies, the stress on the electrodes of wound batteries cannot be released during the expansion process, which may cause the electrodes to break, posing a safety hazard.
Design a battery cell structure including multiple electrode sheets and separators wound to form a flat battery cell body. The outer electrode sheets are the tail section. The tail section is fixed to the battery cell body using a fixing component. The adhesive layer of the fixing component includes a first adhesive layer and a second adhesive layer. The first adhesive layer has less adhesion in the electrolyte than the second adhesive layer. After encapsulation, the adhesiveness of the fixing component is reduced, allowing the tail section to extend freely when it expands.
Before packaging, the battery cells are kept intact. After packaging, the adhesion of the fixing components is reduced to release the battery expansion stress, prevent electrode breakage, and improve safety.
Smart Images
Figure CN223471631U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to battery technology field especially relates to a kind of battery cell. BACKGROUND
[0002] With the progress of science and technology and the development of society, batteries as important energy storage devices have been widely used. At present, a large category of batteries is wound into shape. The battery cell of this type is wound into shape by electrode sheets.
[0003] In the prior art, in order to prevent the wound battery from uncoiling, a finishing paper is usually arranged at the winding end position. One end of the finishing paper is fixed with the electrode sheet finishing end, and the other end is fixed with the battery body. However, in actual use, the battery will swell, and the electrode sheet will generate stress during the swelling process. Since the finishing paper fixes the battery as a whole, the stress of the electrode sheet cannot be released during the swelling process, and eventually the stress may break the electrode sheet, causing safety hazards. Therefore, how to provide a battery cell that can prevent uncoiling before packaging and release stress in time after swelling is a problem that needs to be solved by those skilled in the art. SUMMARY
[0004] The utility model aims to provide a battery cell that can prevent uncoiling before packaging and release stress in time after swelling.
[0005] To solve the above technical problems, the utility model provides a battery cell, which comprises a plurality of electrode sheets and a separator film arranged between any two electrode sheets.
[0006] The electrode sheet and the separator film are wound for multiple turns to form a flat battery cell body, which comprises a flat portion and two corner portions.
[0007] The outermost electrode sheet of the battery cell comprises a finishing section, which is attached to the battery cell body.
[0008] The battery cell further comprises a fixing member for fixing the finishing section and the battery cell body.
[0009] The fixing member comprises a substrate layer and a glue layer on the surface of the substrate layer facing the battery cell body. Part of the glue layer is attached to the finishing section, and another part of the glue layer is attached to the flat portion.
[0010] The glue layer comprises a first glue layer and a second glue layer. The adhesion of the first glue layer in electrolyte is less than that of the second glue layer in electrolyte.
[0011] Optionally, the substrate layer is provided with the first adhesive layer and the second adhesive layer on the side surface facing the battery body, a part of the first adhesive layer is attached to the battery body, and another part of the first adhesive layer is attached to the tail section; the second adhesive layer is attached to the battery body.
[0012] Optionally, the substrate layer is provided with the first adhesive layer and the second adhesive layer on the side surface facing the battery body, a part of the first adhesive layer is attached to the battery body, and another part of the first adhesive layer is attached to the tail section; the second adhesive layer is attached to the tail section.
[0013] Optionally, the substrate layer is provided with the first adhesive layer and the second adhesive layer on the side surface facing the battery body, a part of the first adhesive layer is attached to the battery body, and another part of the first adhesive layer is attached to the tail section; the second adhesive layer is attached to the tail section.
[0014] Optionally, the ratio of the area of the first adhesive layer to the area of the second adhesive layer on the surface of the battery body is 1:9 to 9:1.
[0015] Optionally, the substrate layer is provided with the first adhesive layer and the second adhesive layer on the side surface facing the battery body, a part of the first adhesive layer is attached to the battery body, and another part of the first adhesive layer is attached to the tail section; the second adhesive layer is attached to the tail section.
[0016] Optionally, the ratio of the area of the first adhesive layer to the area of the second adhesive layer on the surface of the tail section is 1:9 to 9:1.
[0017] Optionally, the substrate layer is provided with the first adhesive layer, the void layer, and the second adhesive layer on the side surface facing the battery body, a part of the void layer covers the battery body, and another part of the void layer covers the tail section.
[0018] The first adhesive layer is attached to the battery body, and the second adhesive layer is attached to the tail section.
[0019] Optionally, the substrate layer is provided with the first adhesive layer, the void layer, and the second adhesive layer on the side surface facing the battery body, a part of the void layer covers the battery body, and another part of the void layer covers the tail section.
[0020] The first adhesive layer is attached to the tail section, and the second adhesive layer is attached to the battery body.
[0021] Optionally, the shell is further included, and the cell body, the tail section and the fixing member are arranged in the shell.
[0022] Optionally, the second adhesive layer is arranged on the side surface of the substrate layer facing the shell and is attached to the shell.
[0023] The utility model provides a kind of cell, and cell includes multiple pole piece and the isolation film between any two pole pieces;Pole piece and isolation film are wound multiple turns to form the cell body of flat shape, and cell body includes straight part and two corner sections;The outermost circle of pole piece of cell includes tail section, and tail section is attached to cell body;Cell further includes fixing member, for fixing tail section and cell body;Fixing member includes substrate layer and adhesive layer on the side surface of substrate layer facing cell body, part of area of adhesive layer is attached to tail section, and another part of area of adhesive layer is attached to straight part;Adhesive layer includes first adhesive layer and second adhesive layer, and the adhesion of first adhesive layer in electrolyte is less than the adhesion of second adhesive layer in electrolyte.
[0024] By setting fixing member, cell can be kept from scattering before packaging.And the adhesion of first adhesive layer in electrolyte is less than the adhesion of second adhesive layer in electrolyte, so when the cell is packaged and injected with electrolyte, the viscosity of fixing member will reduce, so as to reduce or eliminate the adhesion of fixing member, so that tail section can smoothly get rid of the constraint of fixing member during battery expansion, achieve the effect of free stretching, to eliminate the stress generated during battery expansion, avoid pole piece from breaking due to excessive stress.
[0025] The utility model further provides a kind of battery, also have the above beneficial effect, here will not be described in detail. ACCURATE DRAWINGS
[0026] In order to more clearly illustrate the technical scheme of the embodiments of the utility model or prior art, the following will be briefly introduced to the drawings needed to be used in embodiment or prior art description, obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creative labor.
[0027] Figure 1 It is the structural schematic diagram of the cell provided in the utility model embodiment;
[0028] Figure 2 It is the specific structural schematic diagram of Figure 1 ;
[0029] Figure 3 It is the structural schematic diagram of the first fixing member provided in the utility model embodiment;
[0030] Figure 4 A first specific structure diagram of an electric core provided by the embodiment of the utility model;
[0031] Figure 5 A second specific structure diagram of an electric core provided by the embodiment of the utility model;
[0032] Figure 6 A third specific structure diagram of an electric core provided by the embodiment of the utility model;
[0033] Figure 7 A fourth specific structure diagram of an electric core provided by the embodiment of the utility model;
[0034] Figure 8 A second specific structure diagram of a fixing component provided by the embodiment of the utility model;
[0035] Figure 9 A fifth specific structure diagram of an electric core provided by the embodiment of the utility model;
[0036] Figure 10 A sixth specific structure diagram of an electric core provided by the embodiment of the utility model;
[0037] Figure 11 A seventh specific structure diagram of an electric core provided by the embodiment of the utility model;
[0038] Figure 12 A third specific structure diagram of a fixing component provided by the embodiment of the utility model;
[0039] Figure 13 A part structure diagram in Figure 11
[0040] In the drawing: 1. electric core main body, 11. first pole piece, 12. second pole piece, 13. first diaphragm, 14. second diaphragm, 15. first tab, 16. second tab, 17. straight part, 18. corner part, 2. tail section, 3. fixing component, 31. base material layer, 32. first glue layer, 33. second glue layer, 34. empty layer, 4. shell. Specific implementation
[0041] The utility model discloses a core. In the prior art, in order to prevent the battery wound into shape from scattering, the end paper is usually arranged at the winding end position, one end of the end paper is fixed with the end of the pole piece, and the other end is fixed with the battery body. However, the adhesion of the end paper remains constant regardless of the environment or working conditions of the battery at the present stage, so that the overall structure of the battery remains fixed. However, the battery will expand in actual use, and the pole piece will generate stress during the expansion process. Since the end paper fixes the battery as a whole, the stress of the pole piece cannot be released during the expansion process, and the stress may eventually break the pole piece, causing a safety hazard.
[0042] The utility model provides a kind of core, and the core includes multiple pole pieces and the isolation film between any two pole pieces;Pole piece and isolation film are wound multiple turns to form the flat core body, and the core body includes straight part and two corner sections;The outermost circle of the pole piece of the core includes end section, and end section is attached with the core body;The core further includes fixing component, for fixing end section and core body;Fixing component includes substrate layer and the adhesive layer on the substrate layer side surface towards the core body, part of the region of adhesive layer is attached with end section, and another part of the region of adhesive layer is attached with straight part;Adhesive layer includes first adhesive layer and second adhesive layer, and the adhesion of first adhesive layer in electrolyte is less than the adhesion of second adhesive layer in electrolyte.
[0043] By setting fixing component, the core can be kept from scattering before packaging. And the adhesion of first adhesive layer in electrolyte is less than the adhesion of second adhesive layer in electrolyte, so when the core is packaged and injected with electrolyte, the adhesion of fixing component will be reduced, so as to reduce or eliminate the adhesion of fixing component, so that end section can smoothly get rid of the constraint of fixing component during the expansion process of the battery, to achieve the effect of free stretching, to eliminate the stress generated during the expansion process of the battery, and avoid the breakage of pole piece due to excessive stress.
[0044] In order to make the personnel in the technical field better understand the utility model scheme, the utility model is further described in detail below in combination with drawings and specific embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, not all. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the scope of protection of the utility model.
[0045] Embodiment one
[0046] Please refer to Figures 1 to 4 , Figure 1 The structure schematic view of the core provided by the utility model embodiment is shown in the figure; Figure 2 The specific structure schematic view of Figure 1 ; Figure 3The structure diagram of the first fixing component is provided in the embodiment of the utility model. Figure 4 The structure diagram of the first specific battery cell is provided in the embodiment of the utility model.
[0047] Referring to Figure 1 In the embodiment, the battery cell comprises a plurality of pole pieces and a separation film arranged between any two of the pole pieces; the pole pieces and the separation film are wound for multiple turns to form a flat battery cell body 1, the battery cell body 1 comprises a flat portion 17 and two corner portions 18; the pole piece of the outermost turn of the battery cell comprises a tail section 2, the tail section 2 is attached to the battery cell body 1; the battery cell further comprises a fixing component 3 for fixing the tail section 2 and the battery cell body 1; the fixing component 3 comprises a base material layer 31 and a glue layer at least on one side surface of the base material layer 31 facing the battery cell body 1, a part of the glue layer is attached to the tail section 2, and another part of the glue layer is attached to the flat portion 17; the glue layer comprises a first glue layer 32 and a second glue layer 33, the adhesion of the first glue layer 32 in electrolyte is less than the adhesion of the second glue layer 33 in electrolyte.
[0048] Referring to Figure 2 The above battery cell is specifically in a wound structure, and the battery cell is usually in a flat structure formed by winding a plurality of pole pieces and a separation film arranged between two pole pieces. In the embodiment, the battery cell has a wound battery cell body 1 and a tail section 2 extending from the battery cell body 1, and the tail section 2 is usually a structure of the pole piece of the outermost turn of the battery cell, and the tail section 2 needs to be attached to the battery cell body 1. The battery cell body 1 is usually flat, has a flat portion 17 in the middle and corner portions 18 at both ends, and usually has two corner portions 18. The flat portion 17 is usually provided with flat pole pieces and separation films, and the corner portions 18 are usually provided with bent pole pieces and separation films.
[0049] In the embodiment, the pole pieces usually comprise first pole pieces 11 and second pole pieces 12, the separation films usually comprise first separation films 13 and second separation films 14, and the battery cell is usually formed by winding the first pole pieces 11, the second pole pieces 12, the first separation films 13 and the second separation films 14, wherein the first pole pieces 11 and the second pole pieces 12 are opposite in polarity, the first pole pieces 11 are connected with first tabs 15, and the second pole pieces 12 are connected with second tabs 16. In the embodiment, the main body structure formed by winding the first pole pieces 11, the second pole pieces 12, the first separation films 13 and the second separation films 14 is the battery cell body 1, and the tail section 2 is the tail of the outermost pole piece extending from the battery cell body 1. In the embodiment, the pole piece of the outermost turn of the battery cell body 1 is referred to as the first pole piece 11, the tail of the first pole piece 11 is referred to as the tail section 2, and the tail section 2 is specifically a structure extending from the battery cell body 1.
[0050] In the present embodiment, the end section 2 is attached to the surface of the electrode body 1 by the fixing member 3, i.e. the end section 2 is fixed to the electrode body 1 by the fixing member 3. The fixing member 3 is usually an end section adhesive paper, one end of which is fixed to the end section 2 and the other end of which is fixed to the electrode body 1, so that the end section 2 is attached to the surface of the electrode body 1. In the present embodiment, the fixing member 3 comprises a substrate layer 31 and an adhesive layer on at least one side of the substrate layer 31. The substrate layer 31 mainly serves to support the adhesive layer, and the adhesive layer mainly serves to connect the substrate layer 31 to the electrode body 1 and the end section 2. The fixing member 3 is located on the same side of the electrode body 1 and the end section 2, so that the end section 2 is fixed to the electrode body 1 by the fixing member 3.
[0051] Specifically, in the present embodiment, part of the adhesive layer is attached to the end section 2, and another part of the adhesive layer is attached to the flat section 17. That is, the fixing member 3 is usually arranged on the flat section 17 of the electrode body 1, and the end section 2 is usually fixed to the flat section 17 by the fixing member 3. Fixing the end section 2 to the flat section 17 can facilitate the arrangement of the fixing member 3. Of course, the end section 2 can also be fixed to the corner section 18 of the electrode body 1, i.e. part of the adhesive layer can be attached to the end section 2, and another part of the adhesive layer can be attached to the corner section 18 in the present embodiment. In this case, the fixing member 3 is difficult to arrange.
[0052] It should be noted that in the present embodiment, the adhesive layer comprises at least a first adhesive layer 32 and a second adhesive layer. The first adhesive layer 32 is in contact with the electrode body 1 and / or the end section 2. The adhesion of the first adhesive layer 32 in the electrolyte is less than that of the second adhesive layer in the electrolyte. Specifically, the first adhesive layer 32 can dissolve in the electrolyte to reduce its adhesion. The second adhesive layer usually does not dissolve in the electrolyte, so that the adhesion of the first adhesive layer 32 in the electrolyte is less than that of the second adhesive layer in the electrolyte. Since the first adhesive layer 32 dissolves in the electrolyte, and the electrode is immersed in the electrolyte during use, the first adhesive layer 32 at least partially dissolves in the electrolyte, so that the adhesion of the fixing member 3 on the side facing the electrode body 1 and the end section 2 is significantly reduced, thereby facilitating the electrode to expand and break free from the fixing member 3, and avoiding the electrode tab from being pulled off. The first adhesive layer 32 can be a PMMA adhesive layer or a rubber material adhesive layer, so that the first adhesive layer 32 can dissolve in the electrolyte. Of course, in the present embodiment, the specific material of the electrolyte and the first adhesive layer 32 is not limited, as long as the first adhesive layer 32 can dissolve in the electrolyte.
[0053] In the utility model, a plurality of different fixed components 3 structures are provided, and the specific structure of the fixed component 3 in the embodiment will be described in detail in the following utility model embodiment, which will not be repeated here.
[0054] The electric core provided in the embodiment can keep the electric core from being scattered before packaging by the fixed component 3. The adhesion of the first adhesive layer 32 in the electrolyte is less than that of the second adhesive layer in the electrolyte, so that the viscosity of the fixed component 3 is reduced after the electric core is packaged and injected with the electrolyte, so that the adhesion of the fixed component 3 is reduced or eliminated, the end section 2 can be smoothly released from the constraint of the adhesive paper during the expansion of the battery, and the effect of free stretching is achieved, so that the stress generated during the expansion of the battery is eliminated, and the pole piece is prevented from being broken due to excessive stress.
[0055] The specific structure of the electric core provided in the utility model will be described in detail in the following utility model embodiment.
[0056] Embodiment two
[0057] Please refer to Figures 3 to 7 , Figure 3 The structure diagram of the first fixed component provided in the utility model embodiment; Figure 4 The structure diagram of the first specific electric core provided in the utility model embodiment; Figure 5 The structure diagram of the second specific electric core provided in the utility model embodiment; Figure 6 The structure diagram of the third specific electric core provided in the utility model embodiment; Figure 7 The structure diagram of the fourth specific electric core provided in the utility model embodiment.
[0058] Different from the above-mentioned utility model embodiment, the utility model embodiment is based on the above-mentioned utility model embodiment, and further limits the structure of the fixed component 3. The remaining contents have been described in detail in the above-mentioned utility model embodiment, which will not be repeated here.
[0059] The embodiment specifically provides a structure of the fixed component 3 and four different fixed component 3 adhering positions.
[0060] The first structure, please refer to Figure 3 And Figure 4 In the utility model embodiment, the first adhesive layer 32 and the second adhesive layer 33 are arranged on the side surface of the base material layer 31 towards the electric core body 1, the first adhesive layer 32 is partially adhered to the electric core body 1, and the other part of the first adhesive layer 32 is adhered to the end section 2; the second adhesive layer 33 is adhered to the electric core body 1.
[0061] In the structure, the substrate layer 31 is provided with two adhesive layers on the side facing the battery body 1 and the end section 2, which are the first adhesive layer 32 and the second adhesive layer 33. The first adhesive layer 32 is soluble in the electrolyte, while the second adhesive layer 33 is generally insoluble in the electrolyte, so that the adhesion of the first adhesive layer 32 in the electrolyte is less than that of the second adhesive layer 33 in the electrolyte. That is, when the battery is immersed in the electrolyte, the adhesion of the second adhesive layer 33 generally does not change significantly. In the structure, the first adhesive layer 32 and the second adhesive layer 33 are provided on different areas of the same side surface of the substrate layer 31, and are generally adjacent and close to each other.
[0062] In the structure, part of the first adhesive layer 32 is in contact with the battery body 1, and another part of the first adhesive layer 32 is in contact with the end section 2, that is, the first adhesive layer 32 is arranged across different step surfaces of the step structure formed by the contact of the end section 2 and the battery body 1, in other words, in this embodiment, the end section 2 and the battery body 1 are fixed to each other based on the first adhesive layer 32, and the second adhesive layer 33 is only in contact with the battery body 1 in the structure. At this time, when the battery is immersed in the electrolyte, the first adhesive layer 32 will dissolve, and the adhesion on which the end section 2 and the battery body 1 are fixed will disappear, so that the position of the end section 2 can move relative to the battery body 1. After the battery is immersed in the electrolyte, the substrate layer 31 will not move in a large range in the battery due to the contact of the second adhesive layer 33 and the battery body 1, thereby affecting other structures in the battery. Specifically, on the surface of the battery body 1, the ratio of the area of the first adhesive layer 32 to the area of the second adhesive layer 33 is in the range of 1:9 to 9:1.
[0063] The second structure is shown in FIG. 2. Figure 5 In the structure, the substrate layer 31 is provided with the first adhesive layer 32 and the second adhesive layer 33 on the side surface facing the battery body 1, part of the first adhesive layer 32 is in contact with the battery body 1, and another part of the first adhesive layer 32 is in contact with the end section 2; the second adhesive layer 33 is in contact with the end section 2.
[0064] The specific structure of the fixing member 3 can refer to the first structure in the embodiment, and will not be described here. In this structure, part of the area of the first adhesive layer 32 is attached to the cell body 1, and another part of the area of the first adhesive layer 32 is attached to the tail section 2, that is, the first adhesive layer 32 is arranged across different step surfaces of the step structure formed by the attachment of the tail section 2 and the cell body 1, in other words, in this embodiment, the tail section 2 and the cell body 1 are fixed to each other based on the first adhesive layer 32, and the second adhesive layer 33 is only attached to the tail section 2 in this structure. At this time, when the cell is immersed in the electrolyte, the first adhesive layer 32 will dissolve, and the adhesion force on which the tail section 2 and the cell body 1 are fixed to each other will disappear, so that the position of the tail section 2 relative to the cell body 1 can move. After the cell is immersed in the electrolyte, the substrate layer 31 will be attached to the tail section 2 due to the arrangement of the second adhesive layer 33, thereby avoiding large-scale movement of the substrate layer 31 in the cell and affecting other structures in the battery. Specifically, on the surface of the tail section 2, the area ratio of the first adhesive layer 32 to the second adhesive layer 33 is 1:9 to 9:1.
[0065] The third structure is shown in FIG. 6. Figure 6 In this structure, the substrate layer is provided with the first adhesive layer and the second adhesive layer on the side surface facing the cell body, part of the area of the second adhesive layer is attached to the cell body, and another part of the area of the second adhesive layer is attached to the tail section; the first adhesive layer is attached to the cell body 1.
[0066] The specific structure of the fixing member 3 can refer to the first structure in the embodiment, and will not be described here. In this structure, part of the second adhesive layer 33 is attached to the cell body 1, and another part of the second adhesive layer 33 is attached to the tail section 2, that is, the second adhesive layer 33 is arranged across the different step surfaces of the step structure formed by the attachment of the tail section 2 and the cell body 1. In other words, in this embodiment, the tail section 2 and the cell body 1 are fixed to each other based on the second adhesive layer 33, and the first adhesive layer 32 is only attached to the cell body 1 in this structure. At this time, when the cell is immersed in electrolyte, the first adhesive layer 32 will dissolve, and the adhesion force on which the tail section 2 and the cell body 1 are fixed will decrease but not disappear due to the dissolution of the first adhesive layer 32. When the cell expands during operation, the tail section 2 and the cell body 1 only need to break free from the restraint of the fixing member 3 by a small stress to release the stress. After the cell is immersed in electrolyte, the substrate layer 31 will be attached to the tail section 2 or the cell body 1 due to the arrangement of the second adhesive layer 33, thereby avoiding large-scale movement of the substrate layer 31 in the cell and affecting other structures in the battery. Specifically, on the surface of the cell body 1, the area ratio of the first adhesive layer 32 to the second adhesive layer 33 is 1:9 to 9:1, so as to ensure the adhesion strength and ensure that the tail section 2 can break free from the restraint of the fixing member 3 during expansion, so as to achieve free stretching.
[0067] The fourth structure is shown in FIG. 4. Figure 7 In this structure, the substrate layer is provided with the first adhesive layer and the second adhesive layer on the side surface facing the cell body 1, part of the second adhesive layer is attached to the cell body 1, and another part of the second adhesive layer is attached to the tail section; the first adhesive layer is attached to the tail section.
[0068] The specific structure of the fixing member 3 can refer to the first structure in the embodiment, and will not be described here. In the structure, part of the second adhesive layer 33 is attached to the cell body 1, and another part of the second adhesive layer 33 is attached to the tail section 2, that is, the second adhesive layer 33 is arranged across different step surfaces of the step structure formed by the attachment of the tail section 2 and the cell body 1. In other words, in the embodiment, the tail section 2 and the cell body 1 are fixed to each other based on the second adhesive layer 33, and the first adhesive layer 32 is only attached to the tail section 2 in the structure. When the cell is immersed in the electrolyte, the first adhesive layer 32 is dissolved, the adhesion between the tail section 2 and the cell body 1 is reduced but not disappeared due to the dissolution of the first adhesive layer 32, and when the cell expands during operation, the tail section 2 and the cell body 1 only need to overcome a small stress to break free from the restraint of the fixing member 3 to release the stress. After the cell is immersed in the electrolyte, the substrate layer 31 is attached to the tail section 2 or the cell body 1 due to the arrangement of the second adhesive layer 33, thereby avoiding large-scale movement of the substrate layer 31 in the cell to affect other structures in the battery. Specifically, on the surface of the tail section 2, the area ratio of the first adhesive layer 32 to the second adhesive layer 33 is 1:9 to 9:1, so as to ensure the adhesion strength and ensure that the tail section 2 can break free from the restraint of the fixing member 3 during expansion to achieve free stretching.
[0069] Of course, in the embodiment, part of the first adhesive layer 32 can be attached to the cell body 1, and another part of the first adhesive layer 32 can be attached to the tail section 2. Correspondingly, part of the second adhesive layer 33 can also be attached to the cell body 1, and another part of the second adhesive layer 33 can also be attached to the tail section 2. When the cell is immersed in the electrolyte, the adhesion between the tail section 2 and the cell body 1 is reduced but not disappeared due to the dissolution of the first adhesive layer 32, and when the cell expands during operation, the tail section 2 and the cell body 1 only need to overcome a small stress to break free from the restraint of the fixing member 3 to release the stress, and the substrate layer 31 is fixedly connected to the tail section 2 or the cell body 1 according to the position of the fixing member 3, that is, according to the attachment area of the second adhesive layer 33 to the tail section 2 and the attachment area of the second adhesive layer 33 to the cell body 1, to avoid large-scale movement of the substrate layer 31 in the battery.
[0070] The cell provided in the embodiment can avoid large-scale movement of the substrate layer 31 in the battery after use, thereby affecting other structures in the battery.
[0071] The specific structure of the cell provided in the utility model will be described in detail in the following utility model embodiments.
[0072] Embodiment three
[0073] Please refer to Figures 8 to 10 , Figure 8 The structure schematic view of the second fixing member provided by the embodiment of the utility model; Figure 9 The structure schematic view of the fifth specific electric core provided by the embodiment of the utility model; Figure 10 The structure schematic view of the sixth specific electric core provided by the embodiment of the utility model.
[0074] Different from the above-mentioned embodiment of the utility model, the embodiment of the utility model is based on the above-mentioned embodiment of the utility model, and further limits the structure of the fixing member 3.The remaining contents have been introduced in detail in the above-mentioned embodiment of the utility model, and will not be repeated here.
[0075] The embodiment specifically provides a structure of the fixing member 3 and two different fixing member 3 adhering positions.
[0076] The first structure, please refer to Figure 9 In the embodiment of the utility model, the base material layer 31 is provided with the first adhesive layer 32, the void layer 34 and the second adhesive layer 33 on the side surface towards the electric core main body 1, the part area of the void layer 34 covers the electric core main body 1, and the other part area of the void layer 34 covers the tail section 2; the first adhesive layer 32 is attached to the tail section 2, and the second adhesive layer 33 is attached to the electric core main body 1.
[0077] Please refer to Figure 8 In the structure, the base material layer 31 is provided with two adhesive layers on the side towards the electric core main body 1 and the tail section 2, which are the first adhesive layer 32 and the second adhesive layer 33.The first adhesive layer 32 is dissolved in the electrolyte, and the second adhesive layer 33 is usually not dissolved in the electrolyte, that is, when the electric core is immersed in the electrolyte, the adhesion of the second adhesive layer 33 usually does not change obviously.In the structure, the first adhesive layer 32 and the second adhesive layer 33 are arranged on different areas of the same side surface of the base material layer 31, and in the embodiment, the first adhesive layer 32 and the second adhesive layer 33 are separated from each other, and the void layer 34 is formed between the first adhesive layer 32 and the second adhesive layer 33.In the embodiment, the first adhesive layer 32, the void layer 34 and the second adhesive layer 33 are located on the same plane of the base material layer 31.
[0078] In the structure, the first adhesive layer 32 only adheres to the end section 2, the second adhesive layer 33 only adheres to the main body 1 of the battery cell, and the void layer 34 covers part of the main body 1 and part of the end section 2. That is, the void layer 34 is arranged across the different steps of the step structure formed by the adhesion between the end section 2 and the main body 1 of the battery cell, and the end section 2 and the main body 1 of the battery cell are fixed to each other by the substrate layer 31. At this time, when the battery cell is immersed in the electrolyte, the first adhesive layer 32 will dissolve, and the adhesion between the end section 2 and the main body 1 of the battery cell will disappear, so that the position of the end section 2 can move relative to the main body 1 of the battery cell. After the battery cell is immersed in the electrolyte, the substrate layer 31 adheres to the main body 1 of the battery cell due to the second adhesive layer 33, and does not move in a large range in the battery cell, thereby affecting other structures in the battery.
[0079] In the structure, the end section 2 and the main body 1 of the battery cell are not completely fixed before the battery cell is immersed in the electrolyte due to the presence of the void layer 34, and can slide relative to each other. At this time, the stress received by the battery cell during transportation and the like can be avoided to prevent the pole piece of the battery cell from being pulled off.
[0080] The second structure is shown in FIG. 2. Figure 10 In the embodiment, the substrate layer 31 is provided with the first adhesive layer 32, the void layer 34, and the second adhesive layer 33 on the side surface facing the main body 1 of the battery cell, part of the void layer 34 covers the main body 1 of the battery cell, and part of the void layer 34 covers the end section 2. The first adhesive layer 32 adheres to the main body 1 of the battery cell, and the second adhesive layer 33 adheres to the end section 2.
[0081] The specific structure of the fixing member 3 can refer to the first structure in the embodiment, and will not be described here. In the structure, the first adhesive layer 32 only adheres to the main body 1 of the battery cell, the second adhesive layer 33 only adheres to the end section 2, and part of the void layer 34 covers the main body 1 of the battery cell and part of the void layer 34 covers the end section 2. That is, the void layer 34 is arranged across the different steps of the step structure formed by the adhesion between the end section 2 and the main body 1 of the battery cell, and the end section 2 and the main body 1 of the battery cell are fixed to each other by the substrate layer 31. At this time, when the battery cell is immersed in the electrolyte, the first adhesive layer 32 will dissolve, and the adhesion between the end section 2 and the main body 1 of the battery cell will disappear, so that the position of the end section 2 can move relative to the main body 1 of the battery cell. After the battery cell is immersed in the electrolyte, the substrate layer 31 adheres to the main body 1 of the battery cell due to the second adhesive layer 33, and does not move in a large range in the battery cell, thereby affecting other structures in the battery.
[0082] And in the structure, the end section 2 of the battery cell is not completely fixed between the main body 1 of the battery cell and the empty layer 34 before the battery cell is immersed in the electrolyte, and can slide relative to each other, so that the stress received by the battery cell during transportation and the like can be avoided, and the pole piece of the battery cell is not pulled off.
[0083] The battery cell provided by the embodiment can avoid the large-scale movement of the base material layer 31 in the battery after use, thereby affecting other structures of the battery, and avoid the pole piece being pulled off under stress during transportation and the like.
[0084] The specific structure of the battery cell provided by the utility model will be described in detail in the following utility model embodiments.
[0085] Embodiment Four
[0086] Please refer to Figures 11 to 13 , Figure 11 The seventh specific structure of the battery cell provided by the utility model embodiment is shown in the structure diagram. Figure 12 The third structure of the fixing member provided by the utility model embodiment is shown in the structure diagram. Figure 13 The structure of the fixing member 3 in the embodiment is shown in the structure diagram. Figure 11
[0087] Different from the above-mentioned utility model embodiments, the utility model embodiment is based on the above-mentioned utility model embodiments, and further limits the structure of the fixing member 3. The remaining contents have been described in detail in the above-mentioned utility model embodiments, and will not be described here.
[0088] Please refer to Figure 11 In the embodiment, the battery cell further includes a shell 4, and the battery cell main body 1, the end section 2 and the fixing member 3 are arranged in the shell 4. In the structure, the above-mentioned battery cell is stored in the shell 4, and the electrolyte can be directly injected into the shell 4 to form a battery. In the embodiment, the shell 4 usually needs to seal the above-mentioned battery cell main body 1, end section 2 and fixing member 3.
[0089] Please refer to Figure 12 and Figure 13 , corresponding, in the embodiment, the substrate layer 31 is provided with a second adhesive layer 33 on the side surface facing the shell 4, and the second adhesive layer 33 is attached to the shell 4. The substrate layer 31 is provided with the first adhesive layer 32 on the side surface facing the core body and the terminal section 2, so that the adhesion between the terminal section 2 and the core body 1 is reduced or even eliminated after the electrolyte is injected into the shell 4, and the electrode plate is prevented from being broken due to expansion. In the embodiment, the side surface of the substrate layer 31 facing the core body and the terminal section 2 can be provided with the first adhesive layer 32, and a part of the first adhesive layer 32 is attached to the core body 1, and another part of the first adhesive layer 32 is attached to the terminal section 2. The adhesive layer on the side surface of the substrate layer 31 facing the core body 1 and the terminal section 2 can be completely dissolved during the operation of the battery, and at this time, the core body 1 and the terminal section 2 are separated due to the absence of the fixing member 3, so that the electrode plate is prevented from being broken due to expansion of the battery.
[0090] Of course, in the embodiment, the adhesive layer structure on the side surface of the substrate layer 31 facing the core body 1 and the terminal section 2 can be any of the adhesive layer structures provided in the above embodiments, and the specific content can be referred to the above embodiments, which will not be described here.
[0091] In the embodiment, the substrate layer 31 is provided with a second adhesive layer 33 on the side surface facing the shell 4, and the second adhesive layer 33 can be used to fix the core body 1 to the shell 4, so that the core body 1 is prevented from shaking in the shell 4. Further, the second adhesive layer 33 is generally insoluble in the electrolyte, that is, the adhesion of the second adhesive layer 33 is generally not changed after the battery is immersed in the electrolyte. Therefore, after the electrolyte is injected into the shell 4, the substrate layer 31 is still fixed to the shell 4 due to the second adhesive layer 33, so that the substrate layer 31 is prevented from moving in the battery and affecting other structures in the battery. When the side surface of the substrate layer 31 facing the core body and the terminal section 2 is provided with the first adhesive layer 32, only the substrate layer 31 is fixed to the shell 4 after the electrolyte is injected, and the core body 1 is separated from the substrate layer 31.
[0092] The battery provided in the embodiment can further protect the structure of the core body 1 by the shell 4. The substrate layer 31 is fixed to the shell 4 by the second adhesive layer 33 on the surface of the substrate layer 31, so that the substrate layer 31 is prevented from moving in the battery and affecting other structures in the battery.
[0093] Embodiment five
[0094] A battery provided in the embodiment of the utility model is introduced below, and the battery described below can be correspondingly referred to the battery described above.
[0095] In the embodiment, the battery comprises an electrolyte and the battery cell as described in any of the above embodiments, and the battery cell is immersed in the electrolyte. The specific structure of the battery cell has been described in detail in the above utility model embodiments, and will not be repeated here. The specific components of the electrolyte and the like can be referred to the prior art, and will not be repeated here.
[0096] Since the battery provided in the embodiment specifically uses the battery cell provided in the above embodiments, the battery can avoid the fracture of the pole piece due to excessive stress caused by expansion during use, thereby making the battery have higher safety and reliability.
[0097] Each of the embodiments in the specification is described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts between the embodiments can be referred to each other.
[0098] Finally, it should be noted that, in this document, the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, article or equipment including the element.
[0099] The above describes in detail the battery cell provided by the utility model. The principle and implementation mode of the utility model are described by applying specific examples in this document. The above embodiment is only used to help understand the method and core idea of the utility model. It should be pointed out that for ordinary skilled persons in the technical field, some improvements and modifications can be made to the utility model without departing from the principle of the utility model, and these improvements and modifications also fall within the protection scope of the claims of the utility model.
Claims
1. An electric cell, characterized by, The battery cell comprises a plurality of pole pieces and a separator film arranged between any two of the pole pieces; The pole pieces and the separator film are wound for multiple turns to form a flat battery cell body, the battery cell body comprising a flat portion and two corner portions; The outermost pole piece of the battery cell comprises a tail section, which is attached to the battery cell body; The battery cell further comprises a fixing member for fixing the tail section and the battery cell body; The fixing member comprises a base material layer and a glue layer on the side surface of the base material layer facing the battery cell body, a part of the glue layer is attached to the tail section, and another part of the glue layer is attached to the flat portion; The glue layer comprises a first glue layer and a second glue layer, the adhesion of the first glue layer in the electrolyte is less than that of the second glue layer in the electrolyte.
2. The electric cell of claim 1, wherein, The side surface of the base material layer facing the battery cell body is provided with the first glue layer and the second glue layer, a part of the first glue layer is attached to the battery cell body, and another part of the first glue layer is attached to the tail section; the second glue layer is attached to the battery cell body.
3. The electric cell of claim 1, wherein, The side surface of the base material layer facing the battery cell body is provided with the first glue layer and the second glue layer, a part of the first glue layer is attached to the battery cell body, and another part of the first glue layer is attached to the tail section; the second glue layer is attached to the tail section.
4. The electric cell of claim 1, wherein, The side surface of the base material layer facing the battery cell body is provided with the first glue layer and the second glue layer, a part of the second glue layer is attached to the battery cell body, and another part of the second glue layer is attached to the tail section; the first glue layer is attached to the battery cell body.
5. The electric cell of claim 4, wherein, The ratio of the area of the first glue layer to the area of the second glue layer on the surface of the battery cell body ranges from 1:9 to 9:
1.
6. The electric cell of claim 1, wherein, The side surface of the base material layer facing the battery cell body is provided with the first glue layer and the second glue layer, a part of the second glue layer is attached to the battery cell body, and another part of the second glue layer is attached to the tail section; the first glue layer is attached to the tail section.
7. The electric cell of claim 6, wherein, The ratio of the area of the first glue layer to the area of the second glue layer on the surface of the tail section ranges from 1:9 to 9:
1.
8. The electric cell of claim 1, wherein, The side surface of the base material layer facing the battery cell body is provided with the first glue layer, a void layer, and a second glue layer, a part of the void layer covers the battery cell body, and another part of the void layer covers the tail section; The first glue layer is attached to the battery cell body, and the second glue layer is attached to the tail section.
9. The electric cell of claim 1, wherein, The side surface of the base material layer facing the battery cell body is provided with the first glue layer, a void layer, and a second glue layer, a part of the void layer covers the battery cell body, and another part of the void layer covers the tail section; The first glue layer is attached to the tail section, and the second glue layer is attached to the battery cell body.
10. The battery cell of any one of claims 1 to 9, wherein, Further comprising a shell, the battery cell body, the tail section, and the fixing member are arranged in the shell.
11. The electric cell of claim 10, wherein, The second adhesive layer is arranged on the substrate layer and adheres to the shell.