Laminated battery
By using the bending and stacking technology of flexible electrode strips, the problem of low production efficiency of existing stacked batteries has been solved, achieving high-efficiency production and stable battery performance.
Patent Information
- Application Number
- CN202422946671.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-29
- Publication Date
- 2025-12-19
- Estimated Expiration
- 2034-11-29
AI Technical Summary
In the current production process of stacked batteries, the die-cutting and alignment stacking efficiency of the electrodes is relatively low, which affects production efficiency.
The battery cell is formed by bending and stacking the electrode strip assembly back and forth in the horizontal direction. The battery cell is made directly by bending the strip electrode and the separator, avoiding the alternating stacking steps of die cutting and alignment.
It improves the production efficiency of stacked batteries, simplifies the production process, enhances the flexibility and energy density of the electrodes, suppresses cell expansion, and ensures the stability of battery use.
Smart Images
Figure CN223693175U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a battery field especially relates to a kind of laminated batteries. BACKGROUND
[0002] The existing laminated battery, including shell and the electric core in the shell, the electric core includes the multiple positive pole piece and multiple negative pole piece of alternate arrangement, and diaphragm is between positive pole piece and negative pole piece.Laminated battery production, first need to cut the raw material pole piece into the specified width strip pole piece, then the strip pole piece is die-cut into rectangular pole piece along the length direction, then multiple rectangular pole piece can be aligned and laminated to make electric core.Currently, there are some kinds of laminated batteries on the market, the width of the pole piece of electric core is smaller, and the laminated number is more, the efficiency of strip pole piece die-cutting and rectangular pole piece alignment and lamination is lower, which affects the production efficiency. SUMMARY
[0003] The utility model aims at at least one of the technical problems existing in prior art is solved.For this purpose, the utility model provides a kind of laminated batteries, which can improve production efficiency.
[0004] According to the laminated battery of the utility model embodiment, the electric core is formed by bending the flexible pole piece strip assembly, the pole piece strip assembly includes the first pole piece, diaphragm and second pole piece laminated, the pole piece strip assembly is bent and laminated by moving back and forth along the horizontal direction, to form multiple flat sections and at least two bending sections, each flat section is arranged along the horizontal direction, all flat sections are sequentially arranged along the vertical direction, and all flat sections are sequentially connected to form a whole by the bending section.
[0005] According to the laminated battery of the utility model embodiment, the pole piece strip assembly is formed by stacking the first pole piece, diaphragm and second pole piece, and the electric core is formed by bending and laminating the pole piece strip assembly along the horizontal direction, so that the first pole piece, diaphragm and second pole piece in strip form can be directly used to bend and make the electric core, without die-cutting the positive pole piece and second pole piece in strip form and then aligning and alternately laminating, thereby improving the production efficiency of the laminated battery.
[0006] According to some embodiments of the utility model, further comprising a shell, the shell has a first pole busbar and a second pole busbar, the shell is provided with a containing cavity, the electric core is located in the containing cavity, the first pole busbar is electrically connected with the first pole piece, the second pole busbar is electrically connected with the second pole piece, and the shell clamps the two sides of the electric core along the vertical direction.
[0007] According to some embodiments of the present application, the upper side of the battery cell is formed by the first pole tab, the lower side of the battery cell is formed by the second pole tab, the first pole busbar and the second pole busbar clamp the battery cell along the up-down direction, the first pole busbar abuts against the upper side of the battery cell, and the second pole busbar abuts against the lower side of the battery cell.
[0008] According to some embodiments of the present application, the shell further comprises an insulating piece, the second pole busbar is a steel frame body arranged around the outer periphery of the battery cell, the steel frame body is provided with the accommodating cavity, the first pole busbar is arranged on the inner side of the second pole busbar, the insulating piece is arranged between the first pole busbar and the second pole busbar, the first pole tab is a positive pole tab, the first pole busbar is a positive pole busbar, the second pole tab is a negative pole tab, and the second pole busbar is a negative pole busbar.
[0009] According to some embodiments of the present application, the second pole busbar comprises a first plate body and a second plate body, both ends of the first plate body are welded and connected with both ends of the second plate body and surround the accommodating cavity, the first pole busbar is arranged on the first plate body, the upper side of the battery cell is opposite to the first plate body, and the lower side of the battery cell is opposite to the second plate body.
[0010] According to some embodiments of the present application, the first plate body and the second plate body are both L-shaped plates.
[0011] According to some embodiments of the present application, part of the bending sections abut against the first pole busbar, and part of the bending sections abut against the second pole busbar.
[0012] According to some embodiments of the present application, the first pole busbar comprises a first pole horizontal plate part and a first pole vertical plate part, the first pole horizontal plate part is parallel to the straight section, the first pole horizontal plate part abuts against the upper side of the battery cell, the first pole vertical plate part is perpendicular to the first pole horizontal plate part, and part of the bending sections abut against the first pole vertical plate part.
[0013] According to some embodiments of the present application, the first pole busbar is a plate body, the thickness of the first pole busbar is C, and 10 μm≤C≤500 μm is satisfied.
[0014] According to some embodiments of the present application, the thickness of the first pole tab and the second pole tab is A, 8 μm≤A≤500 μm is satisfied, and / or the width of the first pole tab and the second pole tab is B, 3 μm≤B≤1000 μm is satisfied.
[0015] Additional aspects and advantages of the present application will be set forth in part in the following description, and in part will become apparent to those skilled in the art upon examination of the following or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS
[0016] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, taken in conjunction with the following drawings, in which:
[0017] Fig. 1 is a cross-sectional view of a stacked battery according to an embodiment of the present application;
[0018] Fig. 2 is a cross-sectional view of an electrode core of a stacked battery according to an embodiment of the present application;
[0019] Fig. 3 is an exploded view of a housing of a stacked battery according to an embodiment of the present application.
[0020] REFERENCE NUMERALS
[0021] electrode core 100, first electrode tab 101, separator 102, second electrode tab 103, electrode tab strip assembly 110, flat section 111, bent section 112;
[0022] housing 200, accommodating cavity 201, first electrode busbar 210, first electrode horizontal plate portion 211, first electrode vertical plate portion 212, first electrode column 213, second electrode busbar 220, first plate body 221, second plate body 222, insulating member 230. DETAILED DESCRIPTION
[0023] Embodiments of the present application will be described in detail below with reference to the drawings, in which like reference numerals refer to like elements throughout. The embodiments described below are examples of the present application, and are merely intended to explain the present application, and should not be construed as limiting the present application.
[0024] In the description of the present application, it should be understood that, in relation to the orientation description, for example, the orientation or position relationship indicated by up, down, etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as a limitation on the present application.
[0025] In the description of the present application, plural means two or more. If there is a description of first, second, etc., it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implying indicating the number of indicated technical features or implying indicating the sequence of indicated technical features.
[0026] In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installation, connection should be understood broadly, and the skilled in the art can determine the specific meaning of the above words in the utility model in combination with the specific content of the technical scheme.
[0027] Referring to Figs. 1 to 3 The utility model discloses a laminated battery, including the core 100 of the battery. The core 100 is bent and constituted by flexible pole piece strip assembly 110, and the pole piece strip assembly 110 includes the first pole piece 101, diaphragm 102 and second pole piece 103 of laminated arrangement, and the pole piece strip assembly 110 is bent and laminated along the horizontal direction to and fro, to form a plurality of straight sections 111 and at least two bending sections 112, and each straight section 111 is arranged along the horizontal direction, and all straight sections 111 are sequentially arranged along the up-down direction, and all straight sections 111 are sequentially connected in series to form a whole through bending section 112.
[0028] The pole piece strip assembly 110 is formed by the first pole piece 101, diaphragm 102 and second pole piece 103, and the core 100 is bent and laminated by moving the pole piece strip assembly 110 along the horizontal direction to and fro, so that the first pole piece 101, diaphragm 102 and second pole piece 103 in strip shape can be directly used to bend and make the core 100, without cutting and then aligning and alternately laminating the first pole piece 101, diaphragm 102 and second pole piece 103 in strip shape, so that the production efficiency of the laminated battery is improved.
[0029] Specifically, the pole piece strip assembly 110 can be bent and laminated to form three, four or more straight sections 111, and the number of corresponding bending sections 112 can be set to two, three or more, and usually the number of straight sections 111 is one more than the number of bending sections 112.
[0030] Specifically, the utility model has a certain flexibility of strip pole piece, which is a self-supporting pole piece obtained by dry preparation, and the flexible pole piece is difficult to obtain by conventional wet preparation. The dry preparation method of pole piece is to stir and disperse the fiberization of active material, conductive agent and binder, and then roll forming and thinning to make a self-supporting pole piece.
[0031] Specifically, the strip-shaped pole piece in the embodiment, for example, the first pole piece 101, is a mixture film piece made by rolling and thinning after the first pole active material, the binder and the conductive agent are mixed uniformly, and the aluminum foil is not needed to be arranged as the first pole current collector, so that the energy density is improved and the flexibility is better. Correspondingly, the second pole piece 103 is a mixture film piece made by rolling and thinning after the second pole active material, the binder and the conductive agent are mixed uniformly, and the copper foil is not needed to be arranged as the second pole current collector. The first pole piece 101 and the second pole piece 103 are both self-supporting pole pieces, and the current collector is not needed to be arranged in the middle of the pole piece, so that the proportion of the active material is obviously improved, the invalid space is reduced, the energy density is obviously improved, and the flexibility is better.
[0032] The binder is usually polytetrafluoroethylene, polyvinylidene fluoride, polypropylene, PW or SA plastic, etc., and the conductive agent is usually SP, CNT, graphene, graphite or kohlen black, etc., and the skilled in the art can be used according to the actual needs.
[0033] In the embodiment, the housing 200 is further included, the housing 200 has the first pole bus 210 and the second pole bus 220, the housing 200 is provided with the accommodating cavity 201, the battery cell 100 is located in the accommodating cavity 201, the first pole bus 210 is electrically connected with the first pole piece 101, the second pole bus 220 is electrically connected with the second pole piece 103, and the housing 200 clamps two sides of the battery cell 100 along the up-down direction. Since the different flat sections 111 of the battery are connected in series along the up-down direction through the bending sections 112 in sequence to realize the lamination, the expansion of the battery cell 100 mainly occurs along the up-down direction in the use process of the battery, and the expansion along the length direction of the flat section 111 is very small, so that the housing 200 of the battery is used to clamp two sides of the battery cell 100 along the up-down direction, that is, the expansion of the battery cell 100 in the use process can be obviously inhibited.
[0034] In the embodiment, the upper side of the battery cell 100 is formed by the first pole tab 101, the lower side of the battery cell 100 is formed by the second pole tab 103, the first pole busbar 210 and the second pole busbar 220 clamp the battery cell 100 along the up-down direction, the first pole busbar 210 abuts against the upper side of the battery cell 100, and the second pole busbar 220 abuts against the lower side of the battery cell 100. The two sides of the battery cell 100 are clamped by the first pole busbar 210 and the second pole busbar 220, and the first pole busbar 210 abuts against the first pole tab 101 and the second pole busbar 220 abuts against the second pole tab 103, so that the battery cell 100 is clamped on both sides by the shell 200, and at the same time, the first pole busbar 210 abuts against the first pole tab 101 and the second pole busbar 220 abuts against the second pole tab 103, so that the battery cell 100 is in full contact with the first pole busbar 210 and the second pole busbar 220, and the use stability of the battery is good; and after the battery cell 100 expands during use, the contact between the battery cell 100 and the first pole busbar 210 and the second pole busbar 220 is even more close and sufficient, so that the battery maintains good use stability for a long time.
[0035] In the embodiment, the shell 200 further comprises an insulating piece 230, the second pole busbar 220 is a steel frame body arranged around the outer periphery of the battery cell 100, the steel frame body is provided with a receiving cavity 201, the first pole busbar 210 is arranged on the inner side of the second pole busbar 220, the insulating piece 230 is arranged between the first pole busbar 210 and the second pole busbar 220, the first pole tab 101 is a positive pole tab, the first pole busbar 210 is a positive pole busbar, the second pole tab 103 is a negative pole tab, and the second pole busbar 220 is a negative pole busbar. The second pole busbar 220 adopts a steel frame body, and the first pole busbar 210 is arranged on the inner side of the frame body through the insulating piece 230, the steel frame body has high structural strength, can significantly inhibit the expansion of the battery cell 100, and can directly serve as the second pole busbar 220, simplifying the structure. When the second pole busbar 220 adopts a steel frame body, the second pole is negative and the first pole is positive. In other embodiments, when the second pole busbar 220 is a frame body made of titanium, nickel or some noble metal material, the second pole can be positive, and the first pole can be negative.
[0036] Specifically, the insulating piece 230 can be a plate-shaped structure made of insulating plastic or other insulating non-metal materials, which isolates the first pole busbar 210 and the second pole busbar 220 to avoid short circuit between the first pole busbar 210 and the second pole busbar 220, such as silicone, rubber or polyvinyl chloride, etc.
[0037] In the embodiment, the second pole busbar 220 comprises a first plate body 221 and a second plate body 222, two ends of the first plate body 221 are welded to two ends of the second plate body 222 to form an accommodation cavity 201, the first pole busbar 210 is arranged on the first plate body 221, the upper side of the battery cell 100 is opposite to the first plate body 221, and the lower side of the battery cell 100 is opposite to the second plate body 222. The second pole busbar 220 is in a frame shape, is formed by welding and surrounding of the first plate body 221 and the second plate body 222, and the upper side and the lower side of the battery cell 100 are opposite to the first plate body 221 and the second plate body 222 respectively, so that the battery cell 100 can be clamped and arranged in the steel frame in the production, and the production and assembly are facilitated.
[0038] It can be imagined that, in some embodiments, the second pole busbar 220 can also be an integrally formed steel frame, and a person skilled in the art can configure it according to actual needs.
[0039] In the embodiment, the first plate body 221 and the second plate body 222 are both L-shaped plates, which are convenient to produce and have good versatility. It can be imagined that, in some embodiments, the first plate body 221 can also be a U-shaped plate, and the corresponding second plate body 222 can be a straight plate, which can also achieve the surrounding to form a frame shape.
[0040] In the embodiment, the partial bending segment 112 abuts against the first pole busbar 210, and the partial bending segment 112 abuts against the second pole busbar 220. By abutting the bending segment 112 against the first pole busbar 210, the electrical contact area of the first pole busbar 210 and the first pole tab 101 can be increased; by abutting the bending segment 112 against the second pole busbar 220, the electrical contact area of the second pole busbar 220 and the second pole tab 103 can be increased. Specifically, the outer periphery of the right bending segment 112 is formed by the first pole tab 101, and the outer periphery of the right bending segment 112 abuts against the first pole busbar 210; the outer periphery of the left bending segment 112 is formed by the second pole tab 103, and the outer periphery of the left bending segment 112 abuts against the second pole busbar 220.
[0041] In the embodiment, the first pole busbar 210 comprises a first pole horizontal plate part 211 and a first pole vertical plate part 212, the first pole horizontal plate part 211 is parallel to the flat segment 111, the first pole horizontal plate part 211 abuts against the upper side of the battery cell 100, the first pole vertical plate part 212 is perpendicular to the first pole horizontal plate part 211, and the partial bending segment 112 abuts against the first pole vertical plate part 212. The structure of the above-mentioned first pole busbar 210 is in an L shape, which is conducive to realizing that the first pole busbar 210 contacts one side of the battery cell 100 along the up-down direction of the flat segment 111 and simultaneously contacts the bending segment 112.
[0042] In an embodiment, the first pole busbar 210 is a plate body, and the thickness of the first pole busbar 210 is C, which satisfies 10 μm≤C≤500 μm. Since the first pole busbar 210 needs to be arranged on the inner side of the steel frame, if the thickness of the first pole busbar 210 is too small, the mechanical strength is insufficient, and the first pole busbar 210 is easy to be deformed and damaged in the process of clamping the battery cell 100; if the thickness of the first pole busbar 210 is too large, the energy density of the battery is greatly affected. Therefore, when the thickness of the first pole busbar 210 is between 10 μm and 500 μm, the mechanical strength of the first pole busbar 210 can relatively meet the use requirement, and the energy density of the battery can be kept at a high level. Optionally, the thickness of the first pole busbar 210 can be selected, for example, 10 μm, 50 μm, 100 μm, 200 μm, 300 μm, 400 μm or 500 μm, or other values in the range, which can be specifically selected by a person skilled in the art according to actual needs.
[0043] In an embodiment, the thickness of the first pole piece 101 and the second pole piece 103 is A, which satisfies 8 μm≤A≤500 μm.
[0044] In an embodiment, the width of the first pole piece 101 and the second pole piece 103 is B, which satisfies 3 μm≤B≤1000 μm. The size of the first pole piece 101 and the second pole piece 103 described above has good strength and is easy to bend, and the processability is good when the stacked battery is manufactured. It can be understood that the thickness A of the first pole piece 101 and the second pole piece 103 can be any value in the range; the width B of the first pole piece 101 and the second pole piece 103 can be any value selected in the range, which can be specifically configured by a person skilled in the art according to actual needs.
[0045] Specifically, the width of the second pole piece 103 is slightly larger than the width of the first pole piece 101, the length of the second pole piece 103 is slightly larger than the length of the first pole piece 101, and one end of the first pole piece 101 is covered with insulating adhesive tape, so as to ensure that the effective area of the second pole piece 103 is greater than the effective area of the first pole piece 101, and reduce the risk of lithium precipitation during use of the battery cell 100.
[0046] Specifically, the steel frame is provided with a clearance hole, and the first pole busbar 210 further comprises a first pole column 213, which is arranged in the clearance hole and exposed to the outside of the steel frame. After the battery cell 100 is loaded into the steel frame, the first pole lug is welded at the first pole column 213, the second pole lug is welded on the steel frame, and the battery cell 100 and the steel frame are packaged by using an aluminum plastic film. After vacuum baking, liquid injection, formation and secondary packaging, the battery is manufactured.
[0047] Specifically, the thickness D of the diaphragm 102 satisfies 3 μm≤D≤50 μm, which is good in comprehensive use effect.
[0048] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean 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.
[0049] Although the embodiments of the present application have been shown and described, it should be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.
Claims
1. A stacked battery characterized by comprising: The application relates to a battery cell (100) which is composed of a flexible tab strip assembly (110) and is bent, the tab strip assembly (110) comprising a first tab (101), a diaphragm (102) and a second tab (103) which are arranged in layers, the tab strip assembly (110) is bent in layers back and forth along the horizontal direction to form a plurality of flat sections (111) and at least two bent sections (112), each of the flat sections (111) is arranged along the horizontal direction, all the flat sections (111) are arranged in sequence along the vertical direction, and all the flat sections (111) are connected in sequence to form a whole through the bent sections (112). The application further relates to a shell (200) which has a first pole busbar (210) and a second pole busbar (220), the shell (200) is provided with a containing cavity (201), the battery cell (100) is located in the containing cavity (201), the first pole busbar (210) is electrically connected with the first tab (101), the second pole busbar (220) is electrically connected with the second tab (103), and the shell (200) clamps both sides of the battery cell (100) along the vertical direction.
2. The stacked battery according to claim 1, characterized by: The upper side of the battery cell (100) is formed by the first tab (101), the lower side of the battery cell (100) is formed by the second tab (103), the first pole busbar (210) and the second pole busbar (220) clamp the battery cell (100) along the vertical direction, the first pole busbar (210) abuts against the upper side of the battery cell (100), and the second pole busbar (220) abuts against the lower side of the battery cell (100).
3. The stacked battery according to claim 2, characterized by: The shell (200) further comprises an insulating member (230), the second pole busbar (220) is a steel frame which surrounds the outer periphery of the battery cell (100), the steel frame is provided with the containing cavity (201), the first pole busbar (210) is arranged on the inner side of the second pole busbar (220), the insulating member (230) is arranged between the first pole busbar (210) and the second pole busbar (220), the first tab (101) is a positive tab, the first pole busbar (210) is a positive busbar, the second tab (103) is a negative tab, and the second pole busbar (220) is a negative busbar.
4. The stacked battery according to claim 3, characterized by: The second pole busbar (220) comprises a first plate body (221) and a second plate body (222), both ends of the first plate body (221) are welded and connected with both ends of the second plate body (222) to form the containing cavity (201), the first pole busbar (210) is arranged on the first plate body (221), the upper side of the battery cell (100) is opposite to the first plate body (221), and the lower side of the battery cell (100) is opposite to the second plate body (222).
5. The stacked battery according to claim 4, characterized by: Both the first plate body (221) and the second plate body (222) are L-shaped plates.
6. The stacked battery according to claim 5, characterized by: 7. The stacked battery according to claim 3, characterized by: Part of the bending section (112) is in abutment with the first pole busbar (210), and part of the bending section (112) is in abutment with the second pole busbar (220).
8. The stacked battery according to claim 7, characterized by: The first pole busbar (210) comprises a first pole horizontal plate portion (211) and a first pole vertical plate portion (212), the first pole horizontal plate portion (211) is parallel to the flat section (111), the first pole horizontal plate portion (211) is in abutment with the upper side of the battery cell (100), and the first pole vertical plate portion (212) is perpendicular to the first pole horizontal plate portion (211), and part of the bending section (112) is in abutment with the first pole vertical plate portion (212).
9. The stacked battery of claim 3, wherein: The first pole busbar (210) is a plate body, and the thickness of the first pole busbar (210) is C, which satisfies 10 μm≤C≤500 μm.
10. The stacked battery of claim 1, wherein: The thickness of the first pole sheet (101) and the second pole sheet (103) is A, which satisfies 8 μm≤A≤500 μm, and / or the width of the first pole sheet (101) and the second pole sheet (103) is B, which satisfies 3 μm≤B≤1000 μm.