Pole group

Abstract

The utility model discloses a pole group. The pole group comprises a pole group body, the first insulating tape comprises a first body part, the second insulating tape comprises a second body part, and the first body part and the second body part are arranged on the two sides of the pole group body in the thickness direction respectively and attached to each other; and the outer edge of the first body part and the outer edge of the second body part both exceed the outer peripheral wall of the pole group body or are flush with the outer peripheral wall of the pole group body. According to the utility model, the performance of the pole group is closer to that of the used battery, so that the evaluation is more accurate, the manufacturing process is simplified, and the cycling stability and consistency are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, and more specifically, to a pole group. Background Art

[0002] When developing batteries, such as power batteries or energy storage batteries, it is necessary to evaluate the manufacturability and electrical properties of the materials of the electrode group, such as positive electrode materials, negative electrode materials, electrolytes, separators, binders, and conductive agents. When different materials are combined, the system performance must be evaluated.

[0003] In some related technologies, when an electrode group is made of the material to be verified, lithium deintercalation will occur on the outermost side of the electrode group body, affecting the capacity, causing faster attenuation under the same charge and discharge mode; in other related technologies, an acrylic plate is added to the electrode group to improve the problem of lithium deintercalation, but the contact between the acrylic plate and the electrolyte of the electrode group increases instability, complicates manufacturing, and increases processing costs. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a pole group, the performance of which is closer to the battery used, ensuring more accurate evaluation, simplifying the production process, and ensuring cycle stability and consistency.

[0005] According to the pole group of the embodiment of the utility model, it includes: a pole group body; a first insulating tape and a second insulating tape, the first insulating tape includes a first body part, the second insulating tape includes a second body part, the first body part and the second body part are respectively arranged on both sides of the pole group body in the thickness direction and are in contact with each other, and the outer edge of the first body part and the outer edge of the second body part both exceed the outer peripheral wall of the pole group body or are flush with the outer peripheral wall of the pole group body.

[0006] According to the electrode assembly of the embodiment of the utility model, the first body part and the second body part are respectively arranged on both sides of the electrode assembly body in the thickness direction and are fitted together, and the outer edge of the first body part and the outer edge of the second body part both exceed the outer peripheral wall of the electrode assembly body or are flush with the outer peripheral wall of the electrode assembly body, so that the first body part and the second body part can completely stick and cover both sides of the electrode assembly body in the thickness direction, avoiding the active material from participating in the reaction during the charge and discharge process, improving the capacity retention rate, making the performance of the electrode assembly closer to the battery used, ensuring more accurate evaluation, and simplifying the production process of the electrode assembly, which is conducive to improving the cycle stability and consistency of the electrode assembly.

[0007] In addition, the electrode group according to the above embodiment of the utility model may also have the following additional technical features:

[0008] According to the pole group of some embodiments of the present invention, the first insulating tape also includes a first extension portion connected to the first main body portion, and the second insulating tape also includes a second extension portion connected to the second main body portion, and the first extension portion and the second extension portion both extend toward a side away from the pole group body, and the first extension portion and the second extension portion are opposite and in contact with each other in the thickness direction of the pole group body.

[0009] According to some embodiments of the present invention, the first extension portions are multiple and are arranged at intervals along the circumferential direction of the first main body portion, and the second extension portions are multiple and correspond one to one to the multiple first extension portions.

[0010] According to some embodiments of the utility model, the electrode group body includes: a positive electrode sheet, one side of which has a positive electrode tab; a negative electrode sheet, one side of which has a negative electrode tab, the positive electrode sheet and the negative electrode sheet are stacked on each other along the thickness direction, and the positive electrode tab and the negative electrode tab are spaced apart along the circumferential direction of the electrode group body, and the first main body portion and the second main body portion are respectively arranged on opposite sides of the positive electrode sheet and the negative electrode sheet and are in contact with each other.

[0011] According to some embodiments of the present invention, the positive electrode tab and the negative electrode tab are located on the same side of the electrode group body.

[0012] According to some embodiments of the utility model, there are multiple positive electrode sheets and multiple negative electrode sheets, and the multiple negative electrode sheets and the multiple positive electrode sheets are staggered and stacked along the thickness direction, and the first main body portion and the second main body portion are respectively arranged on the opposite sides of the outermost positive electrode sheet or the negative electrode sheet in the thickness direction of the electrode group body and are bonded together.

[0013] According to some embodiments of the utility model, the electrode group further includes: a diaphragm assembly, wherein the diaphragm assembly is at least sleeved on one of the two adjacent positive electrode sheets and the negative electrode sheets to separate the two adjacent positive electrode sheets and the negative electrode sheets.

[0014] According to some embodiments of the utility model, the diaphragm assembly includes: a first diaphragm sheet; a second diaphragm sheet, the first diaphragm sheet and the second diaphragm sheet are interconnected to define a accommodating cavity, the accommodating cavity is open on one side along the circumferential direction of the pole group to form an open opening, and the positive pole sheet or the negative pole sheet is located in the accommodating cavity through the open opening.

[0015] According to some embodiments of the present invention, when the plurality of negative electrode sheets and the plurality of positive electrode sheets are staggered and stacked along the thickness direction, the outer peripheral wall of the diaphragm assembly exceeds the outer peripheral wall of the electrode group body.

[0016] According to some embodiments of the present invention, the electrode group further comprises: an aluminum-plastic film, the electrode group body is arranged in the aluminum-plastic film, and the aluminum-plastic film is filled with electrolyte.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 is a schematic diagram of the structure of the electrode group according to an embodiment of the utility model, wherein the aluminum-plastic film has been sealed;

[0020] Figure 2 is a schematic diagram of the structure of the electrode group according to an embodiment of the utility model, wherein the aluminum-plastic film is not sealed;

[0021] Figure 3 is a schematic structural diagram of a pole group body of a pole group according to an embodiment of the utility model;

[0022] Figure 4 is a schematic diagram of the partial structure of the pole group body of the pole group according to an embodiment of the utility model;

[0023] Figure 5 is an exploded view of a pole group body of a pole group according to an embodiment of the utility model;

[0024] Figure 6 is a schematic structural diagram of a negative electrode sheet of an electrode group according to an embodiment of the utility model;

[0025] Figure 7 It is a schematic structural diagram of the first insulating tape or the second insulating tape of the electrode group according to an embodiment of the utility model;

[0026] Figure 8 is a schematic diagram of the structure of the negative electrode sheet of the electrode group according to an embodiment of the utility model and the first insulating tape, wherein the insulating tape is not cut;

[0027] Fig. 9 It is a schematic structural diagram of an angle of the negative electrode sheet of the electrode group according to an embodiment of the utility model and the first insulating tape, wherein the insulating tape has been cut;

[0028] Fig.10 is a schematic structural diagram of another angle of the negative electrode sheet of the electrode group according to an embodiment of the utility model and the first insulating tape, wherein the insulating tape has been cut;

[0029] Fig.11is a schematic structural diagram of a diaphragm assembly of a pole group according to an embodiment of the utility model;

[0030] Fig.12 It is a structural schematic diagram of the processing of the diaphragm assembly of the electrode group according to the embodiment of the utility model, wherein the electric soldering iron seals one side of the diaphragm assembly;

[0031] Fig.13 It is a structural schematic diagram of the processing of the diaphragm assembly of the electrode group according to the embodiment of the utility model, wherein the electric soldering iron seals the other side of the diaphragm assembly;

[0032] Fig.14 is a schematic structural diagram of a positive electrode sheet of an electrode group according to an embodiment of the utility model;

[0033] Fig.15 It is a schematic diagram of the structure of the positive electrode sheet of the electrode group and the diaphragm assembly according to the embodiment of the utility model;

[0034] Fig.16 It is a schematic diagram of the structure of the aluminum-plastic film of the electrode group according to an embodiment of the utility model;

[0035] Fig.17 It is a schematic structural diagram of the aluminum-plastic film of the electrode group according to an embodiment of the utility model being folded in half.

[0036] Reference numerals:

[0037] 100, electrode group; 200, electric soldering iron;

[0038] 10. Electrode group body; 11. Positive electrode sheet; 12. Negative electrode sheet; 111. Positive electrode tab; 121. Negative electrode tab;

[0039] 21. first insulating tape; 22. second insulating tape; 211. first extension portion; 212. first main body portion; 221. second main body portion; 222. second extension portion;

[0040] 30. Diaphragm assembly; 31. First diaphragm; 32. Second diaphragm; 33. Open port;

[0041] 40. Aluminum-plastic film; 41. Sealing part. DETAILED DESCRIPTION

[0042] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0043] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0044] In the description of the present invention, "first feature" and "second feature" may include one or more such features, "plurality" means two or more, the first feature "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them, the first feature "above", "above" and "above" the second feature may include the first feature being directly above and diagonally above the second feature, or may simply mean that the first feature is at a higher level than the second feature.

[0045] The electrode group 100 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0046] Reference Figure 1-Figure 17 As shown, the pole group 100 according to the embodiment of the present invention may include: a pole group body 10 , a first insulating tape 21 and a second insulating tape 22 .

[0047] Specifically, the first insulating tape 21 includes a first main body portion 212, and the second insulating tape 22 includes a second main body portion 221. The first main body portion 212 and the second main body portion 221 are respectively arranged on both sides of the thickness direction of the pole group body 10 and are in contact with each other. The outer edges of the first main body portion 212 and the outer edges of the second main body portion 221 both exceed the outer peripheral wall of the pole group body 10, or the outer edges of the first main body portion 212 and the outer edges of the second main body portion 221 are both flush with the outer peripheral wall of the pole group body 10, which can realize the connection between the first insulating tape 21 and the second insulating tape 22 and the pole group body 10, and can completely cover the large surface of the pole group body 10, meeting the required pasting requirements.

[0048] Since there are active materials on both sides of the electrode group body 10 in the thickness direction, the active materials will participate in the reaction during the charge and discharge process, affecting the capacity of the electrode group 100. Therefore, by pasting and covering both sides of the electrode group body 10 in the thickness direction through the first body part 212 and the second body part 221, the active materials can be prevented from participating in the reaction during the charge and discharge process, and the capacity retention rate can be improved, thereby preventing the electrode group body 10 from deintercalating lithium and affecting the capacity, and eliminating the influence of the structure of the electrode group 100 itself, so that the performance of the electrode group 100 is closer to the battery used, ensuring more accurate evaluation. At the same time, it can avoid adding other materials in the electrode group 100, such as acrylic plates in related technologies, simplifying the production process of the electrode group 100, which is conducive to improving the cycle stability and consistency of the electrode group 100.

[0049] According to the electrode group 100 of the embodiment of the utility model, the first body part 212 and the second body part 221 are respectively arranged on both sides of the thickness direction of the electrode group body 10 and are in contact with each other, and the outer edge of the first body part 212 and the outer edge of the second body part 221 are both beyond the outer peripheral wall of the electrode group body 10 or flush with the outer peripheral wall of the electrode group body 10, so that the first body part 212 and the second body part 221 can completely stick and cover both sides of the thickness direction of the electrode group body 10, avoiding the active material from participating in the reaction during the charge and discharge process, improving the capacity retention rate, making the performance of the electrode group 100 closer to the battery used, ensuring more accurate evaluation, and simplifying the production process of the electrode group 100, which is conducive to improving the cycle stability and consistency of the electrode group 100.

[0050] In some embodiments of the present invention, Figure 3-Figure 5 , Figure 8 and Fig. 9 As shown, the first insulating tape 21 also includes a first extension portion 211, which is connected to the first main body portion 212, and the second insulating tape 22 also includes a second extension portion 222, which is connected to the second main body portion 221. The first extension portion 211 and the second extension portion 222 both extend toward a side away from the pole group body 10, and the first extension portion 211 and the second extension portion 222 are relative and fitted in the thickness direction of the pole group body 10, so that the pole group body 10 is reliably fixed under the action of the first insulating tape 21 and the second insulating tape 22 fitting together, meeting the required fixing requirements.

[0051] At the same time, the first extension portion 211 and the second extension portion 222 can be connected on the outside of the pole group body 10 in the circumferential direction, thereby transferring the connection position of the first insulating tape 21 and the second insulating tape 22 from the large surface of the pole group body 10 to the outside of the large surface of the pole group body 10 in the circumferential direction, avoiding the problem of uneven interface caused by directly fixing the four sides of the pole group body with tape in the related technology, so that the large surface of the pole group body 10 is evenly stressed, ensuring good interface fitting, effectively improving the interface fitting, making the large surface of the pole group body 10 more evenly in contact with the first insulating tape 21 and the second insulating tape 22, and eliminating the influence of the structure of the pole group 100 itself, so that the performance of the pole group 100 is closer to the battery used, ensuring more accurate evaluation.

[0052] In some related technologies, a button battery is made of the material to be verified, but the internal resistance of the button battery is large, which cannot effectively reflect the rate performance, and is quite different from the actual application scenario of the battery; in other related technologies, soft-pack or cylindrical batteries are made of the material to be verified, but the production cycle of soft-pack or cylindrical batteries is long, and the equipment and labor costs are high; in some other related technologies, square batteries are made of the material to be verified, but square batteries are complicated to produce, and the evaluation cost is high and the cycle is long.

[0053] Therefore, in some embodiments of the present invention, the electrode group 100 uses a single-piece battery for evaluation, which can simplify the manufacturing process, save time, and can be used in failure analysis and mechanism analysis of the electrode group 100 to meet the required usage requirements.

[0054] However, since the single-piece battery is based on reducing the number of laminates on the basis of the laminated soft package, when the number of pole pieces in the pole group body 10 is reduced, the thickness of the pole group body 10 is reduced, so that the thickness of the tape will affect the interface unevenness, thereby affecting the performance of the pole group 100. Under the same charging and discharging mode as the laminated soft package, the single-piece battery decays faster.

[0055] Therefore, in the present invention, the connection can be realized on the outside of the circumferential direction of the pole group body 10 by the first extension part 211 and the second extension part 222, so that the connection can be unaffected by the thickness of the pole group body 10, avoiding the problem of uneven interface caused by directly fixing the four sides of the pole group body by tape in the related art, so that the large surface of the pole group body 10 is evenly stressed, ensuring good interface bonding, effectively improving the interface bonding, and eliminating the influence of the structure of the pole group 100 itself, so that the performance of the pole group 100 is closer to the battery used, ensuring more accurate evaluation. At the same time, by pasting and covering the two sides of the pole group body 10 in the thickness direction by the first body part 212 and the second body part 221, it is possible to avoid the active material from participating in the reaction during the charging and discharging process, improve the capacity retention rate, thereby avoiding the pole group body 10 from deintercalating lithium and affecting the capacity, and eliminating the influence of the structure of the pole group 100 itself, so that the performance of the pole group 100 is closer to the battery used, ensuring more accurate evaluation.

[0056] According to some embodiments of the present invention, Figure 3-Figure 5 , Fig. 9 As shown, there are multiple first extension parts 211, and the multiple first extension parts 211 are arranged at intervals along the circumferential direction of the first main body 212, and there are multiple second extension parts 222 corresponding to the multiple first extension parts 211. Therefore, by the one-to-one correspondence between the multiple first extension parts 211 and the multiple second extension parts 222, the internal structure of the pole group body 10 is ensured to be reliably fixed under the forces of multiple different positions, and the problem of falling is avoided, thereby ensuring the assembly reliability.

[0057] In the embodiment of the present invention, the number of the first extension portions 211 can be flexibly set according to actual conditions. For example, the first extension portions 211 can be Fig. 9 Three are shown, but there may also be two, four, five, six or more, all of which are within the protection scope of the present utility model.

[0058] In some embodiments of the present invention, Figure 3-Figure 6 , Figure 8 , Fig. 9 , Fig.10 , Fig.14 and Fig.15 As shown, the electrode group body 10 may include a positive electrode sheet 11 and a negative electrode sheet 12, one side of the positive electrode sheet 11 has a positive electrode tab 111, and one side of the negative electrode sheet 12 has a negative electrode tab 121, the positive electrode sheet 11 and the negative electrode sheet 12 are stacked on each other along the thickness direction, and the positive electrode tab 111 and the negative electrode tab 121 are spaced apart along the circumferential direction of the electrode group body 10, which can meet the assembly requirements of the electrode group body 10 and facilitate the assembly of the electrode group 100.

[0059] At the same time, if Figure 5 , Fig. 9 and Fig.10 As shown, the first main body 212 and the second main body 221 are respectively arranged on the opposite sides of the positive electrode sheet 11 and the negative electrode sheet 12 and are in contact with each other. The active materials applied on the positive electrode sheet 11 and the negative electrode sheet 12 can be pasted and covered by the first main body 212 and the second main body 221, thereby preventing the active materials applied on the positive electrode sheet 11 and the negative electrode sheet 12 from participating in the reaction during the charge and discharge process, thereby improving the capacity retention rate, thereby preventing the electrode group body 10 from deintercalating lithium and affecting the capacity, and ensuring more accurate evaluation.

[0060] In some embodiments, the positive electrode material of the positive electrode sheet 11 includes lithium iron phosphate, a conductive agent and a binder, the ratio of lithium iron phosphate, the conductive agent and the binder is 96.95:1.25:1.8, and the surface density is 18.25 mg / cm 2 The gram specific capacity of the positive electrode active material is 140 mAh / g; the negative electrode material of the negative electrode sheet 12 includes graphite, a conductive agent and a binder, the ratio of graphite, conductive agent and binder is 96.1:1:2.9, and the surface density is 8.74 mg / cm 2 The gram specific capacity of the negative electrode active material is 360 mAh / g, which can meet the manufacturing requirements of the positive electrode sheet 11 and the negative electrode sheet 12.

[0061] In some embodiments, the positive electrode sheet 11 and the positive electrode tab 111 are connected by welding, which ensures a reliable connection and helps reduce production costs.

[0062] In some embodiments, the negative electrode sheet 12 and the negative electrode tab 121 are connected by welding, which ensures a reliable connection and helps reduce production costs.

[0063] According to some embodiments of the present invention, Figure 1-Figure 3 As shown, the positive electrode tab 111 and the negative electrode tab 121 are located on the same side of the electrode group body 10, making the structure compact, facilitating the connection between the positive electrode tab 111 and the negative electrode tab 121 and the electrode group body 10, and facilitating the subsequent evaluation of the electrode group 100, which is beneficial to improving the assembly efficiency and the evaluation efficiency.

[0064] In some embodiments of the present invention, there may be multiple positive electrode sheets 11 and multiple negative electrode sheets 12. Multiple negative electrode sheets 12 and multiple positive electrode sheets 11 are staggered and stacked along the thickness direction, which can meet the different capacity requirements of the electrode group 100 and facilitate the evaluation of different requirements of the electrode group 100.

[0065] In addition, if Figure 5 and Fig.10As shown, the first main body 212 and the second main body 221 are respectively arranged on the opposite sides of the outermost positive electrode sheet 11 or negative electrode sheet 12 in the thickness direction of the electrode group body 10 and are bonded together. The active material applied to the outermost positive electrode sheet 11 or negative electrode sheet 12 is pasted and covered by the first main body 212 and the second main body 221, which can prevent the active material from participating in the reaction during the charging and discharging process, improve the capacity retention rate, and thus prevent the electrode group body 10 from deintercalating lithium and affecting the capacity. The influence caused by the structure of the electrode group 100 itself can be eliminated, so that the performance of the electrode group 100 is closer to the battery used, ensuring more accurate evaluation.

[0066] In some embodiments, the electrode group 100 is charged and discharged by a charge and discharge device, for example, 0.5C constant current and constant voltage charging is adopted, the cut-off current is less than 0.05C, the cut-off voltage is 3.65V, and 0.5C discharge is adopted, and the cut-off voltage is 2.5V. Thus, in the manufactured electrode group 100, for example, the electrode group body 10 includes a positive electrode sheet 11 and a negative electrode sheet 12, or the electrode group body 10 includes two positive electrode sheets 11 and three negative electrode sheets 12, and the active materials are pasted and covered by the first body part 212 and the second body part 221, which can ensure good consistency of the cycle data of the electrode group 100, avoid the problem of rapid attenuation, and improve the capacity retention rate.

[0067] In the embodiment of the present invention, the number of positive electrode sheets 11 can be flexibly set according to actual conditions. For example, the positive electrode sheets 11 can be Figure 5 Two are shown, but three, four, five, six or more may also be provided, all of which are within the protection scope of the present utility model.

[0068] In the embodiment of the present invention, the number of negative electrode sheets 12 can be flexibly set according to actual conditions. For example, the negative electrode sheets 12 can be Figure 5 Three are shown, but there may also be two, four, five, six or more, all of which are within the protection scope of the present utility model.

[0069] According to some embodiments of the present invention, Fig.15 As shown, the electrode group 100 also includes a diaphragm assembly 30, and the diaphragm assembly 30 is at least mounted on one of the two adjacent positive electrode sheets 11 and the negative electrode sheets 12, that is, the diaphragm assembly 30 can be mounted on the positive electrode sheet 11 of the two adjacent positive electrode sheets 11 and the negative electrode sheets 12; or the diaphragm assembly 30 can be mounted on the negative electrode sheet 12 of the two adjacent positive electrode sheets 11 and the negative electrode sheets 12; or the diaphragm assembly 30 is respectively mounted on the two adjacent positive electrode sheets 11 and the negative electrode sheets 12.

[0070] Thus, the separator assembly 30 can separate two adjacent positive plates 11 and negative plates 12, effectively preventing the positive plates 11 and negative plates 12 from contacting each other, and avoiding short circuit problems. At the same time, by placing the positive plate 11 or the negative plate 12 in the separator assembly 30, the hardness of the separator assembly 30 itself can be increased, which is convenient for assembling the electrode group body 10, making the assembly simple, and is conducive to improving the alignment of the positive plate 11, the negative plate 12 and the separator assembly 30, thereby improving the assembly efficiency.

[0071] In some embodiments of the present invention, Figure 11-13 As shown, the diaphragm assembly 30 includes a first diaphragm sheet 31 and a second diaphragm sheet 32. The first diaphragm sheet 31 and the second diaphragm sheet 32 ​​are connected to each other to define a accommodating cavity. The accommodating cavity is open on one side along the circumferential direction of the electrode group 100 to form an open opening 33. The positive electrode sheet 11 or the negative electrode sheet 12 is located in the accommodating cavity through the open opening 33, which is convenient for installing the positive electrode sheet 11 and the negative electrode sheet 12, and is beneficial to improving assembly efficiency. The diaphragm assembly 30 has a simple structure and is easy to process and manufacture.

[0072] In some embodiments, Fig.12 and Fig.13 As shown, the first diaphragm sheet 31 and the second diaphragm sheet 32 ​​can be heat-sealed by an electric soldering iron 200, ensuring that the first diaphragm sheet 31 and the second diaphragm sheet 32 ​​are reliably connected and the operation is simple.

[0073] According to some embodiments of the present invention, Figure 3 and Figure 4 As shown, when multiple negative electrode sheets 12 and multiple positive electrode sheets 11 are staggered and stacked in the thickness direction, the outer peripheral wall of the diaphragm assembly 30 exceeds the outer peripheral wall of the electrode group body 10, which can effectively avoid the risk of short circuit caused by contact between the positive electrode sheets 11 and the negative electrode sheets 12, thereby ensuring the safety of the electrode group 100.

[0074] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the electrode group 100 further includes an aluminum-plastic film 40, and the electrode group body 10 is disposed in the aluminum-plastic film 40. The aluminum-plastic film 40 can protect the electrode group body 10, and the aluminum-plastic film 40 is filled with electrolyte, which can meet the use requirements of the electrode group 100. At the same time, the first body part 212 and the second body part 221 are pasted and covered on both sides of the electrode group body 10 in the thickness direction to prevent the active material from participating in the reaction during the charge and discharge process, thereby avoiding adding other materials in the electrode group 100 to solve the above problems, effectively reducing the thickness of the internal structure of the electrode group 100, ensuring that the aluminum-plastic film 40 is reliably fixed to the electrode group body 10, without the need for punching holes, and convenient production, thereby improving manufacturing efficiency.

[0075] In some specific embodiments, Figure 1-Figure 17As shown, there are three negative electrode sheets 12 and two positive electrode sheets 11 . The length of the positive electrode sheet 11 is 96 mm and the width is 51 mm, and the length of the negative electrode sheet 12 is 100 mm and the width is 55 mm.

[0076] like Figure 11-Figure 15 As shown, the diaphragm assembly 30 is cut so that the width of the diaphragm assembly 30 is 2 mm-4 mm longer than the width of the negative electrode sheet 12, and the length of the diaphragm assembly 30 is twice the length of the negative electrode sheet 12, and 4 mm-8 mm is left. For example, the width of the diaphragm assembly 30 is 59 mm longer than the width of the negative electrode sheet 12, and the length of the diaphragm assembly 30 is 118 mm, forming a Fig.11 Then, the diaphragm assembly 30 is arranged along the length direction (eg Fig.11 Fold it in half (in the left and right directions shown in FIG. 1 ), press it with a steel ruler and fix it, and align one end of the length direction of the diaphragm assembly 30 as shown in FIG. Fig.12 As shown, the electric soldering iron 200 is used for heat sealing, and the diaphragm assembly 30 is sealed in the width direction (for example Fig.11 The up and down direction shown in Fig.13 As shown, the diaphragm assembly 30 is manufactured by heat sealing with an electric soldering iron 200.

[0077] like Fig.15 As shown, the positive electrode sheet 11 is loaded into the diaphragm assembly 30 from the other side in the width direction of the diaphragm assembly 30, so that the positive electrode sheet 11 is in the middle of the diaphragm assembly 30, and the side edges of the positive electrode sheet 11 and the side edges of the diaphragm assembly 30 are each at a distance of 1 mm to 2 mm, for example, the side edges of the positive electrode sheet 11 and the side edges of the diaphragm assembly 30 are each at a distance of 2 mm.

[0078] like Figure 7-Figure 9 As shown, the length of the first insulating tape 21 and the second insulating tape 22 is 10mm-12mm longer than the negative electrode sheet 12, and the width of the first insulating tape 21 and the second insulating tape 22 is 5mm-6mm longer than the negative electrode sheet 12. For example, the length of the first insulating tape 21 and the second insulating tape 22 are 110mm and the width is 60mm. The first insulating tape 21 is pasted on the outer side of one of the negative electrode sheets 12, and the side of the negative electrode sheet 12 in the width direction (for example, Figure 8 The upper side shown in the figure is aligned with the long side of the first insulating tape 21, and the outer sides of the three sides of the negative electrode sheet 12 are all provided with the first insulating tape 21 of 5mm-6mm. For example, the outer sides of the three sides of the negative electrode sheet 12 are all provided with the first insulating tape 21 of 5mm. The large surface of the negative electrode sheet 12 is tightly attached to the first insulating tape 21 and compacted to form a Figure 8 The structure shown in .

[0079] Then, use scissors to trim the first insulating tape 21 located outside the three sides of the negative electrode sheet 12 so that the length direction of the negative electrode sheet 12 (for example, Fig. 9 The left and right directions shown in FIG. 1 and the left and right directions shown in FIG. 1 and the right and left directions shown in FIG. 1 (left and right directions shown in FIG. 1 ) and the left and right directions shown in FIG. 1 and the left and right directions shown in FIG. 1 (right and left directions shown in FIG. 1 ) and the left and right directions shown in FIG. 1 (left and right directions shown in FIG. 1 ) and the left and right directions shown in FIG. 1 (right and left directions Figure 8 The lower side shown in FIG. 1 has a first insulating tape 21 of 5 mm×5 mm to form a first extension portion, such as Fig. 9 At the same time, the other negative electrode sheet 12 and the second insulating tape 22 are processed in the same way, and the bonding surface of the second insulating tape 22 and the other negative electrode sheet 12 is opposite to the bonding surface of the above negative electrode sheet 12.

[0080] like Figure 3-Figure 5 As shown, when the electrode assembly body 10 is laminated, the negative electrode sheet 12 with the first insulating tape 21, the diaphragm assembly 30 with the positive electrode sheet 11, the negative electrode sheet 12, the diaphragm assembly 30 with the positive electrode sheet 11, the negative electrode sheet 12 with the second insulating tape 22 are laminated as shown in FIG. Figure 5 As shown in the figure, the electrodes 10 are stacked and aligned in sequence, and the sides of the negative electrode sheets 12 are 1 mm to 2 mm longer than the sides of the positive electrode sheets 11. For example, the sides of the negative electrode sheets 12 are 2 mm longer than the sides of the positive electrode sheets 11. At the same time, the first extension portion 211 and the second extension portion 222 fit each other to fix the electrode assembly body 10, forming a Figure 4 The structure shown in FIG. 1 is shown in FIG. 1 , and the negative electrode tab 121 and the positive electrode tab 111 are placed on the positive electrode sheet 11 and the negative electrode sheet 12 respectively, and the positive electrode tab 111 and the negative electrode tab 121 are welded by a welding machine, and an insulating glue is pasted at the welding point to form a structure as shown in FIG. Figure 3 The structure shown completes the lamination of the pole group body 10.

[0081] like Fig.16 As shown, the aluminum-plastic film 40 is cut and folded in half to form Fig.17 The structure shown in FIG. 1 is that a sealing machine seals one side of the aluminum-plastic film 40 in the length direction (for example Figure 1 ) and the side opposite to the fold (e.g. Figure 1 The upper side shown in FIG. 1 is sealed to form a sealing portion 41, as shown in FIG. Figure 2 The structure shown in FIG. 1 is provided, and the pole group body 10 is placed from the other side (eg Figure 1 The right side shown in FIG. 1 is loaded into the aluminum-plastic film 40, and the other side of the aluminum-plastic film 40 in the length direction is sealed by a sealing machine to form a sealing portion 41, as shown in FIG. Figure 1 The structure shown in is baked for a certain period of time, and an electrolyte is injected, for example, 3 ml of electrolyte is injected, and the electrode group 100 is completed by vacuum sealing with a vacuum sealing machine, standing, pre-charging, forming, and aging.

[0082] It should be noted that, for the convenience of description, the directions such as "left-right direction" and "up-down direction" in the present invention are based on the direction relationship shown in the drawings, and are not limitations on the directions in actual application.

[0083] Other structures and operations of the electrode group 100 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0084] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0085] In the description of this specification, the description with reference to the terms "embodiment", "specific embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0086] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A pole group, characterized in that: include: The body of the pole group; A first insulating tape and a second insulating tape, wherein the first insulating tape includes a first main body portion, and the second insulating tape includes a second main body portion, the first main body portion and the second main body portion are respectively arranged on both sides of the pole group body in the thickness direction and are in contact with each other, and the outer edge of the first main body portion and the outer edge of the second main body portion both exceed the outer peripheral wall of the pole group body or are flush with the outer peripheral wall of the pole group body.

2. The pole group according to claim 1, characterized in that: The first insulating tape also includes a first extension portion connected to the first main body portion, and the second insulating tape also includes a second extension portion connected to the second main body portion. The first extension portion and the second extension portion both extend toward a side away from the pole group body, and the first extension portion and the second extension portion are opposite and in contact with each other in the thickness direction of the pole group body.

3. The pole group according to claim 2, characterized in that: The first extension portions are multiple and spaced apart along the circumferential direction of the first main body portion, and the second extension portions are multiple and correspond one to one to the multiple first extension portions.

4. The pole group according to claim 1, characterized in that: The pole group body comprises: A positive electrode sheet, one side of which has a positive electrode tab; A negative electrode sheet, one side of which has a negative electrode tab, the positive electrode sheet and the negative electrode sheet are stacked on each other along the thickness direction, and the positive electrode tab and the negative electrode tab are arranged at intervals along the circumferential direction of the electrode group body, and the first main body portion and the second main body portion are respectively arranged on the opposite sides of the positive electrode sheet and the negative electrode sheet and are in contact with each other.

5. The pole group according to claim 4, characterized in that: The positive electrode tab and the negative electrode tab are located on the same side of the electrode group body.

6. The pole group according to claim 4, characterized in that: There are multiple positive electrode sheets and multiple negative electrode sheets, and the multiple negative electrode sheets and the multiple positive electrode sheets are stacked alternately along the thickness direction. The first main body and the second main body are respectively arranged on the opposite sides of the outermost positive electrode sheet or the negative electrode sheet in the thickness direction of the electrode group body and are bonded together.

7. The pole group according to claim 6, characterized in that: The pole group also includes: A diaphragm assembly is sleeved on at least one of the two adjacent positive electrode sheets and the negative electrode sheets to separate the two adjacent positive electrode sheets from the negative electrode sheets.

8. The pole group according to claim 7, characterized in that: The diaphragm assembly comprises: first diaphragm; The second diaphragm sheet, the first diaphragm sheet and the second diaphragm sheet are connected to each other to define a accommodating cavity, the accommodating cavity is open on one side along the circumferential direction of the electrode group to form an open opening, and the positive electrode sheet or the negative electrode sheet is located in the accommodating cavity through the open opening.

9. The pole group according to claim 7, characterized in that: When the plurality of negative electrode sheets and the plurality of positive electrode sheets are stacked alternately along the thickness direction, the outer peripheral wall of the diaphragm assembly exceeds the outer peripheral wall of the electrode group body.

10. The pole group according to claim 1, characterized in that: Also includes: Aluminum-plastic film, the electrode group body is arranged in the aluminum-plastic film, and the aluminum-plastic film is filled with electrolyte.

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