Naked battery cell and battery pack with same
By creating channels in the positive plate, negative plate, and separator of the battery cell, the problem of excessively large cell size caused by the gaps in the electrode tabs is solved, achieving a compact design of the battery cell and battery pack and improving safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-27
- Publication Date
- 2026-03-27
AI Technical Summary
In existing technologies, the tabs protrude through the gap between the positive and negative electrode plates, which is not conducive to reducing the size of the battery cell and makes it difficult to reduce the size of the battery pack.
A first through hole, a second through hole, and a third through hole are formed in the non-edge areas of the positive plate, the negative plate, and the separator, respectively, forming a channel. The positive and negative tabs pass through the channel and are separated by an insulating block. The tabs are staggered to reduce internal resistance.
By shortening the overall electron transport path of the electrode plates, the internal resistance and size of the bare cell are reduced, thereby making the cell and battery pack smaller, improving manufacturing convenience and safety.
Smart Images
Figure CN224053139U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to battery technology field, provide a kind of bare cell and the battery pack with the bare cell specifically. BACKGROUND
[0002] In recent years, with the continuous development of new energy electric vehicle industry and electric energy storage industry, the market's performance requirements of battery pack, which occupies an important position, are continuously improved. The reduction of the volume of the battery pack and the increase of the electric energy storage capacity of the battery pack are one of the current development trends of the battery pack. In order to meet the needs of both aspects, the cells in the battery pack need to be arranged more compactly, and the number of cells contained in the battery pack is more. At the same time, the safety problem caused by overheating in the battery pack also needs to be solved.
[0003] In order to solve the problem of overheating of the battery pack, measures can be taken from promoting heat dissipation and reducing heat generation. To reduce heat generation, the main method is to reduce the internal resistance of the cells that make up the battery pack. The tab of the existing laminated cell is usually welded on one side of the positive plate and the negative plate. The electrons on the other side of the positive plate and the negative plate need to pass through the entire plate to reach the tab. The transmission path of the electrons is relatively long, and the overall resistance of the cell is relatively large. In order to shorten the overall electron transmission path of the plate, the tab can be arranged in the non-edge area (such as the middle area) of the plate. Specifically, one end of the positive tab and the negative tab is welded on the middle of the positive plate and the middle of the negative plate respectively, and the other end of the positive tab and the negative tab respectively passes out from the gap between the positive sheet (a plate-like structure composed of a positive plate and active material arranged on the surface of the positive plate) and the negative sheet (a plate-like structure composed of a negative plate and active material arranged on the surface of the negative plate).
[0004] Although this can shorten the overall electron transmission path of the plate and reduce the internal resistance of the cell, there is a large gap between the positive sheet and the negative sheet, which makes the size of the cell in the stacking direction of the sheet larger, which is not conducive to the reduction of the volume of the cell, and thus not conducive to the reduction of the volume of the battery pack.
[0005] Therefore, there is a need in the art for a new technical solution to solve the above problems. SUMMARY
[0006] The utility model aims at solving the above technical problems, i.e. solving the problem that the tab passing out from the gap between the positive sheet and the negative sheet is not conducive to reducing the size of the cell.
[0007] In a first aspect, the utility model provides a kind of bare electric core, the bare electric core includes the positive pole sheet and multiple negative pole sheet of the multiple positive pole sheet and multiple negative pole sheet of layering and the diaphragm between adjacent pole sheet, the positive pole sheet includes positive pole plate and the positive pole active material layer being arranged in the side surface of the positive pole plate opposite the negative pole sheet, the negative pole sheet includes negative pole plate and the negative pole active material layer being arranged in the side surface of the negative pole plate opposite the positive pole sheet;The non-edge area of the positive pole plate, the negative pole plate and the diaphragm is formed with first via, second via, third via respectively, the partial edge of the first via and the partial edge of the second via are respectively connected with positive pole lug and negative pole lug, the positive pole lug and the negative pole lug are misaligned arrangement, the positive pole lug is insulated with the negative pole sheet and the negative pole lug, the negative pole lug is insulated with the positive pole sheet and the positive pole lug, the first via, the second via, the third via are connected into channel, the positive pole lug and the negative pole lug are worn out from the channel.
[0008] In the above preferred technical solutions of bare electric core, the first via, the second via, the third via are formed in the same position of the positive pole plate, the negative pole plate and the diaphragm respectively.
[0009] In the above preferred technical solutions of bare electric core, the first via, the second via, the third via are formed in the middle of the positive pole plate, the negative pole plate and the diaphragm respectively.
[0010] In the above preferred technical solutions of bare electric core, the first via, the second via and the third via are all rectangular holes, all the positive pole lug is formed at the first side edge of the first via, and all the negative pole lug is formed at the second side edge of the second via.
[0011] In the above preferred technical solutions of bare electric core, the first side edge and the second side edge are opposite to each other.
[0012] In the above preferred technical solutions of bare electric core, the positive pole lug is formed by cutting part of the profile of the local part of the positive pole plate and then folding, and / or the negative pole lug is formed by cutting part of the profile of the local part of the negative pole plate and then folding.
[0013] In the above preferred technical solutions of bare electric core, the profile size of the positive pole lug and the negative pole lug is respectively smaller than the profile size of the first via and the second via;And / or the connecting part of the positive pole lug and the first side edge forms the first arc surface panel structure that is arched in the direction away from the first side edge, and the connecting part of the negative pole lug and the second side edge forms the second arc surface panel structure that is arched in the direction away from the second side edge.
[0014] In the preferred technical solution of the bare battery cell described above, the channel is filled with an insulating block to separate the part of the positive tab inside the channel from the part of the negative tab inside the channel; and / or the positive tab and the negative tab are connected to the partial side wall of the first via and the partial side wall of the second via, respectively.
[0015] In the preferred technical solution of the bare battery cell described above, all the positive tabs extend towards the first end of the channel, all the negative tabs extend towards the second end of the channel; or all the positive tabs extend towards the first end of the channel, all the negative tabs extend towards the first end of the channel; or the positive tabs on the positive plate near the first end of the channel and the negative tabs on the negative plate near the first end of the channel extend towards the first end of the channel, and the positive tabs on the positive plate near the second end of the channel and the negative tabs on the negative plate near the second end of the channel extend towards the second end of the channel.
[0016] In the case of using the technical solution described above, the bare battery cell includes a plurality of positive sheets and a plurality of negative sheets stacked together and a separator between adjacent sheets, the positive sheet includes a positive plate and a positive active material layer arranged on the side of the positive plate opposite to the negative sheet, and the negative sheet includes a negative plate and a negative active material layer arranged on the side of the negative plate opposite to the positive sheet; the non-edge area of the positive plate, the negative plate and the separator is formed with a first via, a second via and a third via, respectively, the partial edge of the first via and the partial edge of the second via are connected with a positive tab and a negative tab, respectively, the positive tab and the negative tab are arranged in a staggered manner, the positive tab is insulated from the negative sheet and the negative tab, and the negative tab is insulated from the positive sheet and the positive tab, the first via, the second via and the third via are connected into a channel, and the positive tab and the negative tab pass out of the channel.
[0017] Through such a setting, since the positive plate, the negative plate and the separator are formed with the first via, the second via and the third via in the non-edge area, respectively, the first via, the second via and the third via are connected into a channel, one end of the positive tab and the negative tab is connected to the partial edge of the first via and the second via, respectively, and the other end of the positive tab and the negative tab passes out of the channel, the positive sheet, the separator and the negative sheet are closely attached together, which reduces the size of the bare battery cell in the stacking direction of the positive sheet and the negative sheet, the size of the battery cell made of the bare battery cell is smaller, and the size of the battery pack composed of the battery cell is also smaller under the condition that the number and arrangement of the battery cells are unchanged.
[0018] Preferably, the first via, the second via and the third via are formed at the same position of the positive plate, the negative plate and the separator, respectively.
[0019] Through such an arrangement, the first via hole, the second via hole and the third via hole formed on the positive plate, the negative plate and the diaphragm are connected into a channel when the positive plate, the negative plate and the diaphragm are stacked, and the manufacturing convenience of the bare battery cell is improved.
[0020] Preferably, the first via hole, the second via hole and the third via hole are formed in the middle part of the positive plate, the negative plate and the diaphragm, respectively.
[0021] Compared with the same position of the first via hole, the second via hole and the third via hole formed in the region between the edge and the middle part of the positive plate, the negative plate and the diaphragm, respectively, the first via hole, the second via hole and the third via hole are formed in the middle part of the positive plate, the negative plate and the diaphragm, respectively, and the local edge of the first via hole and the local edge of the second via hole are connected with the positive lug and the negative lug, respectively, so that the overall electronic transmission path of the plate is shorter, and the internal resistance of the bare battery cell is smaller.
[0022] Preferably, the first via hole, the second via hole and the third via hole are all rectangular holes, all the positive lugs are formed at the first side edge of the first via hole, and all the negative lugs are formed at the second side edge of the second via hole.
[0023] Through such an arrangement, the manufacturing procedures of all the positive plates are the same, the manufacturing procedures of all the negative plates are the same, the manufacturing process is simplified, and the manufacturing efficiency is improved without changing the manufacturing process.
[0024] Preferably, the first side edge and the second side edge are opposite to each other.
[0025] Through such an arrangement, the distance between the positive lug and the negative lug is larger, and the risk of short circuit caused by contact between the positive lug and the negative lug is greatly reduced.
[0026] Preferably, the positive lug is formed by folding back the partial profile of the local part of the positive plate; and / or the negative lug is formed by cutting and folding back the partial profile of the local part of the negative plate.
[0027] Through such an arrangement, the positive lug is integrally connected with the positive plate, and the negative plate is integrally connected with the negative lug, and compared with the welding connection of the positive lug with the local edge of the first via hole and the welding connection of the negative lug with the local edge of the second via hole, the resistance at the connection between the positive lug and the positive plate and the resistance at the connection between the negative lug and the negative plate are smaller, and accordingly, the internal resistance of the bare battery cell is smaller. In addition, the positive lug is formed by cutting and folding back the partial profile of the local part of the positive plate, and the negative lug is formed by cutting and folding back the partial profile of the local part of the negative plate, and in this process, the first via hole and the second via hole are also formed, and compared with the welding connection of the positive lug with the local edge of the first via hole and the welding connection of the negative lug with the local edge of the second via hole, the first via hole and the second via hole need to be separately cut out on the positive plate and the negative plate, respectively, so that the manufacturing procedure is simplified, and the manufacturing cost is reduced.
[0028] Preferably, the contour sizes of the positive and negative tabs are respectively smaller than the contour sizes of the first and second through holes; and / or the connecting part of the positive tab with the first side edge forms a first arc panel structure which arches away from the first side edge, and the connecting part of the negative tab with the second side edge forms a second arc panel structure which arches away from the second side edge.
[0029] The contour sizes of the positive and negative tabs are respectively smaller than the contour sizes of the first and second through holes, so that the risk of contact friction with the edges of the cutting holes on the positive / negative plate during the process of local folding of the positive / negative plate after partial profile cutting can be reduced, and the positive / negative tab formed after local folding can be more conveniently obtained. The connecting part of the positive tab with the first side edge forms a first arc panel structure which arches away from the first side edge, and the connecting part of the negative tab with the second side edge forms a second arc panel structure which arches away from the second side edge, so that the positive tab can be conveniently insulated from the edge of the second through hole on the negative plate which faces the positive tab, and the negative tab can be conveniently insulated from the edge of the first through hole on the positive plate which faces the negative tab, facilitating manufacturing. It can be understood that the insulation of the positive tab from the edge of the second through hole on the negative plate which faces the positive tab can also be achieved by arranging an insulation material layer on the side of the positive tab closest to the first side edge, and the insulation of the negative tab from the edge of the first through hole on the positive plate which faces the negative tab can also be achieved by arranging an insulation material layer on the side of the negative tab closest to the second side edge.
[0030] Preferably, the channel is filled with an insulation block so as to separate the part of the positive tab in the channel from the part of the negative tab in the channel.
[0031] By filling the channel with an insulation block so as to separate the part of the positive tab in the channel from the part of the negative tab in the channel, the risk of contact and short circuit of the positive and negative tabs in the case of extrusion deformation of the bare battery cell can be reduced, and the safety of the bare battery cell is improved.
[0032] In a second aspect, the utility model also provides a battery pack, the battery pack includes the bare battery cell of any one of the above technical solutions.
[0033] It should be noted that the battery pack has all the technical effects of the bare battery cell of any one of the above technical solutions, which will not be described here again. BRIEF DESCRIPTION OF DRAWINGS
[0034] The preferred embodiments of the utility model will be described below with reference to the drawings, in which:
[0035] Figure 1 is the explosion view of the bare battery cell of an embodiment of the utility model;
[0036] Figure 2 is a structural schematic view of a bare battery cell of an embodiment of the present application;
[0037] Figure 3 is a top view of a bare battery cell of an embodiment of the present application;
[0038] Figure 4 is a sectional view along Figure 3 A-A plane;
[0039] Figure 5 is an enlarged view of part B in Figure 4
[0040] List of reference signs:
[0041] 1, positive electrode sheet; 11, positive electrode plate; 111, first via hole; 112, positive electrode tab; 1121, first arc surface plate structure; 12, positive electrode active material layer; 2, negative electrode sheet; 21, negative electrode plate; 211, second via hole; 212, negative electrode tab; 22, negative electrode active material layer; 3, separator; 31, third via hole; 4, channel; 5, insulating block. DETAILED DESCRIPTION
[0042] First, those skilled in the art should understand that the embodiments described below are only used to explain the technical principles of the present application, and are not intended to limit the protection scope of the present application.
[0043] It should be noted that in the description of the application, the terms "left", "right", "up", "down" and the like indicate the direction or positional relationship of the terms based on the direction or positional relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0044] In addition, it should be noted that in the description of the application, unless otherwise explicitly specified and limited, the term "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected, it can be directly connected, or it can be indirectly connected. For those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.
[0045] Based on the problem that the tab mentioned in the background art is not conducive to reducing the size of the bare battery cell, the utility model provides a kind of bare battery cell, and bare battery cell includes the lamination of multiple positive plate and multiple negative plate and diaphragm between adjacent tab, and positive plate includes positive plate and the positive active material layer being set in the side of positive plate opposite negative plate, and negative plate includes negative plate and the negative active material layer being set in the side of negative plate opposite positive plate;Non-edge area of positive plate, negative plate and diaphragm is formed with first via hole, second via hole, third via hole respectively, and the local edge of first via hole and the local edge of second via hole are respectively connected with positive tab and negative tab, and positive tab and negative tab are set in dislocation, and positive tab is insulated with negative tab and negative tab, and negative tab is insulated with positive tab and positive tab, and first via hole, second via hole, third via hole are connected into channel, and positive tab and negative tab are out of channel.
[0046] By such setting, since positive plate, negative plate and diaphragm form first via hole, second via hole, third via hole in non-edge area respectively, first via hole, second via hole, third via hole are connected into channel, one end of positive tab and negative tab is respectively connected to the local edge of first via hole and second via hole, and the other end of positive tab and negative tab is out of the channel, and positive tab, diaphragm and negative tab are closely adhered together, reduce the size of bare battery cell in the lamination direction of positive tab and negative tab, and the size of battery cell made of the bare battery cell is smaller, and the size of battery pack composed of the battery cell is also smaller under the condition that the number and arrangement mode of battery cell are unchanged.
[0047] Reference is made below Figures 1 to 5 Detailed introduction is made to the bare battery cell of the utility model. Among them, Figure 1 It is the explosion view of the bare battery cell of one embodiment of the utility model; Figure 2 It is the structure schematic view of the bare battery cell of one embodiment of the utility model; Figure 3 It is the plan view of the bare battery cell of one embodiment of the utility model; Figure 4 It is the section view along Figure 3 A-A surface; Figure 5 It is Figure 4 The enlarged view of part B in it.
[0048] As shown in Figures 1 to 5 , bare battery cell includes three positive plate 1 and three negative plate 2, and positive plate 1 and negative plate 2 are alternately and sequentially set from top to bottom, and one diaphragm 3 is arranged between any adjacent positive plate 1 and negative plate 2, and the outer contour of positive plate 1, negative plate 2 and diaphragm 3 is all the same size rectangle.
[0049] As shown in Figure 5As shown, the positive sheet 1 includes positive plates 11 and positive active material layers 12 arranged on the side of the positive plates 11 opposite to the negative sheet 2, and the negative sheet 2 includes negative plates 21 and negative active material layers 22 arranged on the side of the negative plates 21 opposite to the positive sheet 1, wherein the uppermost positive plate 11 is provided with the positive active material layer 12 only on the lower side, the upper and lower sides of other positive plates 11 are provided with the positive active material layer 12, the lowermost negative plate 21 is provided with the negative active material layer 22 only on the upper side, and the upper and lower sides of other negative plates 21 are provided with the negative active material layer 22.
[0050] The non-edge regions of the positive plates 11, the negative plates 21 and the separator 3 are respectively formed with first through holes 111, second through holes 211 and third through holes 31 at the same positions; specifically, as shown in Figure 1 The first through holes 111, the second through holes 211 and the third through holes 31 are respectively formed in the middle of the positive plates 11, the negative plates 21 and the separator 3, and the first through holes 111, the second through holes 211 and the third through holes 31 are all rectangular holes with the same cross-sectional size, and the long edges of the first through holes 111, the second through holes 211 and the third through holes 31 are parallel to the short edges of the positive plates 11, the negative plates 21 and the separator 3.
[0051] The partial edges of the first through holes 111 and the partial edges of the second through holes 211 are respectively connected with positive tabs 112 and negative tabs 212, the positive tabs 112 and the negative tabs 212 are arranged in a staggered manner, the positive tabs 112 are insulated from the negative sheet 2 and the negative tabs 212, and the negative tabs 212 are insulated from the positive sheet 1 and the positive tabs 112; it should be noted that the partial edges of the first through holes 111 can be the partial side walls of the first through holes 111, or the partial surface portions of the positive plates 11 surrounding the first through holes 111, and the partial edges of the second through holes 211 can be the partial side walls of the second through holes 211, or the partial surface portions of the negative plates 21 surrounding the second through holes 211. Refer to Figure 1As shown in the orientation, the positive tab 112 is arranged at the left side wall of the first via hole 111 (i.e. the side wall of the profile long side of the first via hole 111), the negative tab 212 is arranged at the right side wall of the second via hole 211 (i.e. the side wall of the profile long side of the second via hole 211), the positive tab 112 is formed by cutting part of the profile of the local part of the middle of the positive plate 11 and then folding upward, the local part of the middle of the positive plate 11 is folded to form the first via hole 111 in the middle of the positive plate 11, the negative tab 212 is formed by cutting part of the profile of the local part of the middle of the negative plate 21 and then folding upward, the local part of the negative plate 21 is folded to form the second via hole 211 in the middle of the negative plate 21. The profile size of the positive tab 112 and the negative tab 212 is respectively smaller than the profile size of the first via hole 111 and the second via hole 211, and the connecting part of the positive tab 112 and the left side wall of the first via hole 111 forms a first arc surface panel structure 1121 which arches away from the left side wall of the first via hole 111, the connecting part of the negative tab 212 and the right side wall of the second via hole 211 forms a second arc surface panel structure (not shown in the figure, the specific structure can refer to the first arc surface panel structure 1121).
[0052] As shown in the orientation, Figure 4 and Figure 5 The first via hole 111, the second via hole 211 and the third via hole 31 are connected to form a channel 4, and the positive tab 112 and the negative tab 212 are arranged to pass through the channel 4 upward, and the channel 4 is filled with an insulating block 5 to separate the part of the positive tab 112 in the channel 4 and the part of the negative tab 212 in the channel 4. It can be understood that the insulating block 5 can be made of insulating rubber, insulating plastic or other insulating materials.
[0053] By forming the first via hole 111, the second via hole 211 and the third via hole 31 in the middle of the positive plate 11, the negative plate 21 and the separator 3 respectively, the first via hole 111, the second via hole 211 and the third via hole 31 are connected to form a channel 4, and one end of the positive tab 112 and the negative tab 212 is connected to the local edge of the first via hole 111 and the second via hole 211 respectively, which shortens the overall electronic transmission path of the plate and reduces the internal resistance of the bare cell, and makes the positive sheet 1, the separator 3 and the negative sheet 2 closely adhere to each other, reduces the size of the bare cell in the stacking direction of the positive sheet 1 and the negative sheet 2, and the size of the cell made of the bare cell is smaller, and the size of the battery pack composed of the cell is also smaller under the condition that the number and arrangement of the cells are unchanged.
[0054] Compared with the same positions of the first via hole 111, the second via hole 211 and the third via hole 31 formed between the edge and the middle part of the region of the positive plate 11, the negative plate 21 and the diaphragm 3, the first via hole 111, the second via hole 211 and the third via hole 31 are formed in the middle part of the positive plate 11, the negative plate 21 and the diaphragm 3 respectively, and the partial edge of the first via hole 111 and the partial edge of the second via hole 211 are connected with the positive lug 112 and the negative lug 212 respectively, so that the overall electronic transmission path of the plate is shorter, and the internal resistance of the bare battery is smaller. The first via hole 111, the second via hole 211 and the third via hole 31 are formed in the same position of the non-edge region of the positive plate 11, the negative plate 21 and the diaphragm 3, so that it is convenient to form the first via hole 111, the second via hole 211 and the third via hole 31 on the positive plate 11, the negative plate 21 and the diaphragm 31, and connect the first via hole 111, the second via hole 211 and the third via hole 31 into the channel 4 when the positive plate 11, the negative plate 21 and the diaphragm 31 are stacked, thereby improving the manufacturing convenience of the bare battery.
[0055] It should be noted that this is only a more preferred setting mode, which can be adjusted in actual application, such as in a specific setting mode, the first via hole 111, the second via hole 211 and the third via hole 31 are formed in the same position of the region between the edge and the middle part of the positive plate 11, the negative plate 21 and the diaphragm 3; in another specific setting mode, the non-edge region of the positive plate 11 can also be provided with a plurality of first via holes 111, and the partial edge of each first via hole 111 is connected with a positive lug 112, the non-edge region of the negative plate 21 is formed with a plurality of corresponding second via holes 211 at the same position, and the partial edge of each second via hole 211 is connected with a negative lug 212, and the non-edge region of the diaphragm 3 is formed with a plurality of corresponding third via holes 31 at the same position. In addition, the first via hole 111, the second via hole 211 and the third via hole 31 are formed in the same position of the non-edge region of the positive plate 11, the negative plate 21 and the diaphragm 3, which is only a more preferred setting mode, which can be adjusted in actual application, such as the first via hole 111, the second via hole 211 and the third via hole 31 are formed in different positions of the non-edge region of the positive plate 11, the negative plate 21 and the diaphragm 3, and the partial of the first via hole 111, the second via hole 211 and the third via hole 31 are attached to each other, so that the first via hole 111, the second via hole 211 and the third via hole 31 are connected into the channel 4, and the positive lug 112 and the negative lug 212 are pulled out from the channel 4.
[0056] The positive tab 112 is formed by cutting and folding part of the profile of the local part of the positive plate 11, and the negative tab 212 is formed by cutting and folding part of the profile of the local part of the negative plate 21, so that the positive tab 112 is integrally connected with the positive plate 11, and the negative plate 21 is integrally connected with the negative tab 212. Compared with the welding connection of the positive tab 112 with the local edge of the first via hole 111 and the welding connection of the negative tab 212 with the local edge of the second via hole 211, the resistance at the connection between the positive tab 112 and the positive plate 11 and the resistance at the connection between the negative tab 212 and the negative plate 21 are smaller, and accordingly, the internal resistance of the bare battery cell is smaller. In addition, the positive tab 112 is formed by cutting and folding part of the profile of the local part of the positive plate 11, and the negative tab 212 is formed by cutting and folding part of the profile of the local part of the negative plate 21. In this process, the first via hole 111 and the second via hole 211 are also formed at the same time. Compared with the welding connection of the positive tab 112 with the local edge of the first via hole 111 and the welding connection of the negative tab 212 with the local edge of the second via hole 211, which requires cutting out the first via hole 111 and the second via hole 211 on the positive plate 11 and the negative plate 21 respectively, the manufacturing process is simplified and the manufacturing cost is reduced.
[0057] It should be noted that this is only a more preferred setting mode, which can be adjusted in actual application. For example, in a specific setting mode, the positive tab 112 and the negative tab 212 are separately formed and then welded to the local edge of the first via hole 111 and the local edge of the second via hole 211, respectively.
[0058] The positive tab 112 is arranged at the left side wall of the first via hole 111, and the negative tab 212 is arranged at the right side wall of the second via hole 211, that is, all the positive tabs 112 are arranged at the same side edge of the first via hole 111, and all the negative tabs 212 are arranged at the same side edge of the second via hole 211. In this way, the manufacturing process of all the positive plates 11 is the same, and the manufacturing process of all the negative plates 21 is the same, without the need to change the manufacturing process, simplifying the manufacturing process and improving the manufacturing efficiency. The positive tab 112 and the negative tab 212 are arranged at the opposite side edges of the first via hole 111 and the second via hole 211, respectively, which are parallel to the short side of the positive sheet 1 and the negative sheet 2. Compared with the outer profile of the positive sheet 1 and the negative sheet 2 being rectangular and the positive tab 112 and the negative tab 212 being arranged at the opposite side edges of the first via hole 111 and the second via hole 211, respectively, which are parallel to the long side of the positive sheet 1 and the negative sheet 2, the overall electronic transmission path of the plate is shorter, and the internal resistance of the bare battery cell is smaller.
[0059] It should be noted that the positive tab 112 is arranged at the left side wall of the first via hole 111, and the negative tab 212 is arranged at the right side wall of the second via hole 211, that is, the positive tab 112 is arranged at the long edge of the first via hole 111, and the negative tab 212 is arranged at the long edge of the second via hole 211, which is only a more preferred arrangement, which can be adjusted in actual application, such as the positive tab 112 is arranged at the short edge of the first via hole 111, and the negative tab 212 is arranged at the short edge of the second via hole 211; or the positive tab 112 is arranged at the long edge of the first via hole 111, and the negative tab 212 is arranged at the short edge of the second via hole 211, the positive tab 112 is cut narrower than the first via hole 111, and the negative tab 212 is cut narrower than the second via hole 211, that is, the positive tab 112 and the negative tab 212 are located at the adjacent edges of the via hole; or a part of the positive tab 112 is arranged at one short edge of the first via hole 111, and the other part of the positive tab 112 is arranged at one long edge of the first via hole 111, a part of the negative tab 212 is arranged at the other short edge of the second via hole 211, and the other part of the negative tab 212 is arranged at the other long edge of the second via hole 211, the positive tab 112 is cut narrower than the first via hole 111, and the negative tab 212 is cut narrower than the second via hole 211. In addition, the first via hole 111, the second via hole 211 and the third via hole 31 are all rectangular holes with the same cross-sectional size, which is also a specific arrangement, which can be adjusted in actual application, such as in a specific arrangement, the first via hole 111, the second via hole 211 and the third via hole 31 are all square holes, waist-shaped holes, regular hexagonal holes or other suitable shaped holes with the same cross-sectional size.
[0060] It should be further noted that the positive and negative tabs 112 and 212 are upwardly penetrated from the channel 4, which is only one specific arrangement, and in actual application, it can be adjusted, such as in one specific arrangement, all the positive tabs 112 are upwardly penetrated from the channel 4, and all the negative tabs 212 are downwardly penetrated from the channel 4; in another specific arrangement, the positive tabs 112 on the positive plates 11 near the upper end of the channel 4 and the negative tabs 212 on the negative plates 21 near the upper end of the channel 4 extend towards the upper end of the channel 4, and the positive tabs 112 on the positive plates 11 near the lower end of the channel 4 and the negative tabs 212 on the negative plates 21 near the lower end of the channel 4 extend towards the lower end of the channel 4. In addition, the number of the positive sheets 1 and the negative sheets 2 in the above-mentioned embodiments is three respectively, which is only one specific arrangement, and in actual application, it can be adjusted, such as the number of the positive sheets 1 and the negative sheets 2 can be one, two, four or more respectively. Furthermore, the positive sheets 1, the diaphragms 3 and the negative sheets 2 are sequentially stacked in the manner of “positive sheet-diaphragm-negative sheet-diaphragm-positive sheet-diaphragm-negative sheet”, which is only one more preferred arrangement, and in actual application, it can be adjusted, such as the positive sheets 1, the diaphragms 3 and the negative sheets 2 can also be sequentially stacked in the manner of “negative sheet-diaphragm-positive sheet-diaphragm-negative sheet-diaphragm-positive sheet”, and can also be sequentially stacked in the manner of “positive sheet-diaphragm-negative sheet-diaphragm-positive sheet-diaphragm-negative sheet-diaphragm”; when sequentially stacked in the manner of “positive sheet-diaphragm-negative sheet-diaphragm-positive sheet-diaphragm-negative sheet-diaphragm”, the positive plates of the positive sheets and the negative plates of the negative sheets are provided with active material layers only on the opposite sides of each other.
[0061] In the second aspect, the utility model still provides a battery pack (not shown in the figure), the battery pack includes the bare electric core of any one of the above-mentioned various embodiments. The battery pack has all the technical effects of the bare electric core of any one of the above-mentioned embodiments, which will not be repeated here.
[0062] So far, the technical scheme of the utility model has been described in combination with the preferred embodiments shown in the drawings, but those skilled in the art can easily understand that the protection scope of the utility model is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without departing from the principles of the utility model, and the technical schemes after the changes or replacements will all fall within the protection scope of the utility model.
Claims
1. A bare cell, characterized by, The bare battery cell comprises a plurality of positive electrode sheets and a plurality of negative electrode sheets stacked together and a separator between adjacent electrode sheets, the positive electrode sheet comprises a positive electrode plate and a positive active material layer arranged on a side of the positive electrode plate facing the negative electrode sheet, and the negative electrode sheet comprises a negative electrode plate and a negative active material layer arranged on a side of the negative electrode plate facing the positive electrode sheet; Non-edge regions of the positive electrode plate, the negative electrode plate and the separator are respectively formed with a first via hole, a second via hole and a third via hole, partial edges of the first via hole and the second via hole are respectively connected with a positive electrode tab and a negative electrode tab, the positive electrode tab and the negative electrode tab are arranged in a staggered manner, the positive electrode tab is insulated from the negative electrode sheet and the negative electrode tab, the negative electrode tab is insulated from the positive electrode sheet and the positive electrode tab, the first via hole, the second via hole and the third via hole are connected into a channel, and the positive electrode tab and the negative electrode tab pass out of the channel.
2. The bare cell of claim 1, wherein, The first via hole, the second via hole and the third via hole are formed at the same position of the positive electrode plate, the negative electrode plate and the separator.
3. The bare cell of claim 2, wherein, The first via hole, the second via hole and the third via hole are formed at the middle of the positive electrode plate, the negative electrode plate and the separator.
4. The bare cell of claim 2, wherein, The first via hole, the second via hole and the third via hole are all rectangular holes, all the positive electrode tabs are formed at a first side edge of the first via hole, and all the negative electrode tabs are formed at a second side edge of the second via hole.
5. The bare cell of claim 4, wherein, The first side edge and the second side edge are opposite to each other.
6. The bare cell of any one of claims 2 to 5, wherein, The positive electrode tab is formed by cutting part of the profile of the positive electrode plate and then folding it; and / or The negative electrode tab is formed by cutting part of the profile of the negative electrode plate and then folding it.
7. The bare cell of claim 6, wherein, The profile size of the positive electrode tab and the negative electrode tab is respectively smaller than the profile size of the first via hole and the second via hole; and / or The connection part of the positive electrode tab and the first side edge forms a first arc surface panel structure arched away from the first side edge, and the connection part of the negative electrode tab and the second side edge forms a second arc surface panel structure arched away from the second side edge.
8. The bare cell of claim 1, wherein, The channel is filled with an insulating block to separate the part of the positive electrode tab in the channel and the part of the negative electrode tab in the channel; and / or The positive electrode tab and the negative electrode tab are respectively connected to the partial side wall of the first via hole and the partial side wall of the second via hole.
9. The bare cell of any one of claims 1 to 5, wherein, All the positive electrode tabs extend towards a first end of the channel, and all the negative electrode tabs extend towards a second end of the channel; or All the positive electrode tabs extend towards a first end of the channel, and all the negative electrode tabs extend towards the first end of the channel; or The positive electrode tab on the positive electrode plate close to the first end of the channel and the negative electrode tab on the negative electrode plate close to the first end of the channel extend towards the first end of the channel, and the positive electrode tab on the positive electrode plate close to the second end of the channel and the negative electrode tab on the negative electrode plate close to the second end of the channel extend towards the second end of the channel.
10. A battery pack, characterized by, The battery pack comprises the bare battery cell of any one of claims 1 to 9.