CN213601905U - Naked electric core and battery - Google Patents

Abstract

The utility model belongs to the technical field of lithium ion battery, concretely relates to naked electric core, including positive plate, diaphragm and the negative pole piece of range upon range of setting, the diaphragm sets up between positive plate and negative pole piece, and positive plate, diaphragm and negative pole piece form through the fifty percent discount naked electric core. Compared with the prior art, the utility model has the advantages that the positive plate, the diaphragm and the negative plate which are sequentially stacked are folded to form the naked electric core, so that the naked electric core forms a structure of 'half winding and half stacking', compared with the traditional stacking type process, the bottom edge of the arc structure is increased, the powder falling phenomenon caused by vibration is effectively relieved, and meanwhile, the risk that burrs pierce the diaphragm is reduced; in addition, compare in traditional coiling formula technology, the structure of lamination is replaced by the circular arc structure in the top of naked electric core, consequently, has improved the space utilization at naked electric core top, has strengthened the energy density of battery. Furthermore, the utility model also provides a battery.

Description

Naked electric core and battery

Technical Field

The utility model belongs to the technical field of lithium ion battery, concretely relates to naked electric core and battery.

Background

The lithium ion battery has the advantages of high working voltage, high energy density, long service cycle life, light weight, no memory and the like, so that the lithium ion battery is widely applied to the fields of new energy automobiles, intelligent electric equipment and the like.

Lithium ion batteries are mainly classified into a winding type and a lamination type according to the processing mode. Wherein, the production technology efficiency of lamination formula is lower for the coiling formula technology, and because the cutting device of pole piece has certain fit-up gap usually, consequently, the burr that causes the cross cutting edge of pole piece is more, increased the burr and punctured the risk of diaphragm, on the other hand, the in-process of shell is gone into in the installation to the bottom of lamination structure, pole piece perpendicular to horizontal plane, because the effect of gravity, take place the phenomenon of falling powder easily at electric core assembly and in-process pole piece of using, and then cause the inside short circuit of battery, certain potential safety hazard has been brought for the use of battery. Although the production efficiency of the winding process is high, and the powder falling phenomenon at the bottom of the naked battery core is reduced to a certain extent, in the production process, the phenomenon of uneven tension is easily caused at the edge corners of the winding process, and then the winding process is broken or deformed, so that the safety performance of the battery is influenced, furthermore, the two ends of the battery core of the winding structure are both arc-shaped structures, the problem of low utilization rate of the top space is caused, and the energy density of the battery is reduced.

In view of the above, according to the above circumstances, the present invention provides a new solution for combining winding type and laminated type cells to meet the actual production needs.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a pair of naked electric core has solved the defect that exists among the above-mentioned prior art effectively through this naked electric core.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a naked electric core, is including range upon range of positive plate, diaphragm and the negative pole piece that sets up, the diaphragm set up in positive plate with between the negative pole piece, positive plate the diaphragm with the negative pole piece forms through the fifty percent discount naked electric core.

As right the utility model discloses in the improvement of naked electric core, naked electric core bonds on its at least one edge beyond the fifty percent discount end has fixed adhesive tape, the thickness of fixed adhesive tape is 10 ~ 100 mu m. The fixed gummed paper is used for fixing the edge of the bare cell, and especially fixing the edge part of the bare cell opposite to the folded end, so that the fixed gummed paper cannot be too thick or too thin, and if the fixed gummed paper is too thick, redundant space in the battery can be occupied, and the energy density of the battery is further reduced; in addition, the naked electric core in the utility model has a certain thickness after being folded, if the fixed gummed paper is too thin, when the thicker naked electric core is bonded, the phenomenon of the fixed gummed paper breaking is easy to occur due to the tension action at the two ends of the sealing part, and the production yield of the product is reduced; furthermore, the fixed gummed paper is easy to tear in severe environments such as vibration and collision due to small thickness in the long-term use process, so that the stability of the battery is reduced, and potential safety hazards are increased.

As right the utility model discloses in the improvement of naked electric core, positive plate the negative pole piece with the quantity of diaphragm is n, n +1 and 2n +2 respectively, wherein, n is the natural number, and 1 is less than or equal to n and is less than or equal to 100. When the lithium ion battery is charged, the positive plate needs to remove lithium ions, and the negative plate is responsible for receiving the lithium ions, so that when the number of the negative plates is set to be more than that of the positive plates by one plate, the negative plates can be ensured to completely receive the lithium ions removed from the positive plates, and the capacity of the battery is improved; in addition, the diaphragm mainly plays a role in separation, when the positive plate, the diaphragm and the negative plate in the stacking state are folded in half, in order to avoid direct contact of the negative plates at two ends of the folded surface, the diaphragm is arranged to be 2n +2 layers, the topmost layer and the bottommost layer of the positive plate, the diaphragm and the negative plate in the stacking state are all arranged to be the diaphragm, the negative plate of the folded surface can be separated by the diaphragm after folding, and the safety performance of the bare cell is improved.

As right the utility model discloses in naked electric core's improvement, positive plate with the thickness of negative pole piece is 70 ~ 200 mu m, the thickness of diaphragm is 5 ~ 30 mu m.

As an improvement on the bare cell in the utility model, the widths of the positive plate, the negative plate and the diaphragm are set to A, A +2mm and A +5mm in sequence, wherein A is more than or equal to 1 and less than or equal to 1000 mm; the lengths of the positive plate, the negative plate and the diaphragm are set to be B, B +2mm and B +5mm in sequence, wherein B is more than or equal to 1 and less than or equal to 400 mm. The area of the diaphragm is larger than the areas of the positive plate and the negative plate, so that the diaphragm can effectively separate the positive plate and the negative plate, the short circuit phenomenon in the battery caused by direct contact of the positive plate and the negative plate is prevented, and the safe operation of the battery is ensured; the area of the negative plate is larger than that of the positive plate, so that a sufficient lithium embedding position can be provided for the negative plate, and further, the precipitation of lithium ions in the charging process is avoided.

As right the utility model discloses in the improvement of naked electric core, positive plate is connected with anodal ear, the negative pole piece is connected with the negative pole ear, naked electric core is its be provided with on at least one edge beyond the folding end anodal ear and/or the negative pole ear.

As right the utility model discloses in the improvement of naked electric core, the positive plate the diaphragm with the shape of negative plate is the axisymmetric figure. By adopting the axially symmetrical graph structure, after the positive plate, the diaphragm and the negative plate are folded in half, the superposition of two ends of a bare cell is facilitated to be ensured, and the space utilization rate and the energy density in the battery are improved; the axisymmetric pattern can be a rectangle, an isosceles triangle, a circle, an ellipse, an isosceles trapezoid and the like, and can be subjected to rationality adaptation according to specific production requirements.

As right the utility model discloses in the improvement of naked electric core, the both sides of naked electric core fifty percent discount department are formed with contained angle alpha, alpha's scope is 0 ~ 90. Because the bare cell is formed by folding the positive plate, the diaphragm and the negative plate in half, two ends of the folded part can form corresponding angles by adopting different folding angles; in the utility model, when the thickness and the number of layers of the positive plate, the negative plate and the diaphragm are larger, the integral thickness of the lamination is larger, so that a larger folding angle, such as 45 degrees and 60 degrees, is usually adopted, which is more beneficial to the convenience of folding, and reduces the risk of the breakage of the pole piece at the folding position; when the thickness and the number of layers of the positive plate, the negative plate and the diaphragm are smaller, the overall thickness is smaller, the easy folding effect can be realized by adopting a smaller folding angle, and the production efficiency is improved. Of course, the angle of this doubling back can be adapted reasonably according to specific production requirements.

The beneficial effects of the utility model reside in that: the utility model discloses a with positive plate, the diaphragm, the negative pole piece is range upon range of setting in proper order, then carry out the fifty percent discount and form naked electric core again, make naked electric core form the structure of "half coiling + half lamination", on the one hand, compare in traditional lamination formula technology, the fifty percent discount end of naked electric core is convex structure, therefore, when the assembly, can go into the shell as the bottom of naked electric core with the fifty percent discount end of circular arc structure, thereby it takes place the phenomenon of falling the powder to have alleviated the bottom and received the vibration, the security performance of battery has been improved effectively, in addition, because the edge of a set of lamination structure of naked electric core has been replaced into the edge of circular arc structure, the die cutting total length at positive plate and negative pole piece edge has been reduced promptly, therefore, the quantity of burr and the risk that the diaphragm was punctureed to the burr have still; on the other hand, compare in traditional coiling formula technology, the utility model discloses replace the convex structure at naked electric core top into range upon range of structure, improved the space utilization at naked electric core top, strengthened the energy density of battery.

The utility model also provides a battery, naked electric core including at least one, naked electric core be in above-mentioned arbitrary one section naked electric core. The structure through with above-mentioned naked electric core is applied in the battery, has improved the energy density and the security performance of battery effectively.

Drawings

The accompanying drawings, which are described herein, serve to provide a further understanding of the invention and constitute a part of this specification, and the exemplary embodiments and descriptions thereof are provided to explain the invention and not to constitute an undue limitation on the invention. In the drawings:

fig. 1 is a schematic diagram of the stacked state of the positive plate, the diaphragm and the negative plate in the present invention;

fig. 2 is a schematic diagram of the state of the positive plate, the diaphragm and the negative plate after being folded in half;

FIG. 3 is a schematic structural view of the present invention;

fig. 4 is a schematic structural view of a positive plate in embodiment 1 of the present invention;

fig. 5 is a schematic structural view of a negative electrode sheet in embodiment 1 of the present invention;

fig. 6 is a schematic structural diagram of embodiment 1 of the present invention;

fig. 7 is a schematic structural view of a positive plate in embodiment 2 of the present invention;

fig. 8 is a schematic structural view of a negative electrode sheet in embodiment 2 of the present invention;

fig. 9 is a schematic structural view of embodiment 2 of the present invention;

fig. 10 is a schematic structural view of a positive plate in embodiment 3 of the present invention;

fig. 11 is a schematic structural view of a negative electrode sheet in embodiment 3 of the present invention;

fig. 12 is a schematic structural view of embodiment 3 of the present invention;

fig. 13 is a schematic structural view of embodiment 4 of the present invention;

fig. 14 is a schematic structural view of embodiment 5 of the present invention;

fig. 15 is a schematic structural view of embodiment 6 of the present invention;

wherein, 0-naked electric core; 1-positive plate; 2-a separator; 3-negative pole piece; 4-fixing adhesive tape; 11-positive tab; 31-negative tab.

Detailed Description

As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, within which a person skilled in the art can solve the technical problem to substantially achieve the technical result.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", horizontal "and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

The present invention will be described in further detail with reference to the accompanying drawings, which are not intended to limit the present invention.

As shown in FIGS. 1-3, a naked electric core, including range upon range of positive plate 1, diaphragm 2 and the negative pole piece 3 that sets up, diaphragm 2 sets up between positive plate 1 and negative pole piece 3, and positive plate 1, diaphragm 2 and negative pole piece 3 form naked electric core 0 through the fifty percent discount coincidence.

It should be noted that in the utility model discloses in, to above-mentioned naked electric core 0, carry out the fifty percent discount through positive plate 1, diaphragm 2, the negative pole piece 3 by the lamination state, make the utility model discloses the naked electric core structure of half coiling formula and half lamination formula structure has been formed, and one end is the fifty percent discount end of circular arc structure promptly, and all the other edges are the lamination structure of lamination formula.

So, according to the structure of above-mentioned naked electric core 0, the in-process of going into the shell is installed at naked electric core 0, can go into the shell as naked electric core 0's bottom with the fifty percent discount end of circular arc structure to improved naked electric core 0 bottom effectively and strikeed the powder phenomenon that falls that leads to owing to receiving the vibrations, reduced the risk of the inside short circuit of battery, promoted the whole security performance of battery.

In order to make the utility model discloses other marginal fixings outside the fifty percent discount end of well naked electric core 0 with fold up, the utility model discloses the accessible bonds fixedly through fixed adhesive tape 4 in above-mentioned edge, wherein, the fixed adhesive tape 4 of one section or multistage can bond at every edge to ensure suitable fixed effect. The fixing adhesive tape 4 can adopt green adhesive or other fixing adhesive tapes with the same characteristics commonly used for battery packaging, so that the applicability and the utilization rate of packaging materials can be improved, and the production cost is reduced.

In the actual implementation process, the thickness of the fixed gummed paper 4 can be set to be 10-100 μm, and in the range, the fixed gummed paper 4 is prevented from occupying too much space inside the battery, meanwhile, the phenomenon of breakage in the production process of the naked battery core 0 can be reduced, and the product goodness and the later-stage use stability are improved.

Because go into the shell as naked electric core 0's bottom with circular arc structure's fifty percent discount end, consequently, the shell is gone into as naked electric core 0's top to the relative open end of fifty percent discount end, and this kind of structure is compared in traditional coiling electric core, has promoted naked electric core 0 headspace's utilization ratio more effectively to the energy density of battery has been increased.

In one embodiment provided by the present invention, the positive electrode sheet 1, the separator 2 and the negative electrode sheet 3 are all configured to be rectangular. So, at the in-process of naked electric core 0 production, can carry out the fifty percent discount with positive plate 1, diaphragm 2 and negative pole piece 3 along its symmetry axis to make naked electric core 0 can realize coincidence in the both sides after the fifty percent discount and form naked electric core 0 of rectangular structure, promoted the space utilization and the energy density at naked electric core top.

Of course, the positive electrode plate 1, the separator 2 and the negative electrode plate 3 include, but are not limited to, the above rectangular structures, and may also be in an isosceles trapezoid, an isosceles triangle, a circle, an oval, and the like, and may be reasonably adapted according to a specific battery shape.

In addition, in the process of folding the positive plate 1, the diaphragm 2 and the negative plate 3 in half, due to the influence of the thickness and the number of layers of the positive plate and the diaphragm 2, different folding angles can be adopted according to specific production requirements, for example, when the thickness and the number of layers of the positive plate 1, the negative plate 3 and the diaphragm 2 are larger, the integral thickness of the stack is larger, so that a larger folding angle, such as 45 degrees and 60 degrees, is usually adopted, the folding is more convenient, and the risk of the breakage of the pole pieces at the folding position is reduced; when the thickness and the number of layers of the positive plate 1, the negative plate 3 and the diaphragm 2 are smaller, the overall thickness is smaller, the easy folding effect can be realized by adopting a smaller folding angle, and the production efficiency is improved. In the utility model discloses in, the fifty percent discount angle can set up to 0 ~ 90, after the fifty percent discount, makes the both ends of fifty percent discount department form corresponding 0 ~ 90 structure.

In the utility model, the number of the positive plate 1, the negative plate 3 and the diaphragm 2 is n, n +1 and 2n +2 respectively, wherein n is a natural number, and n is more than or equal to 1 and less than or equal to 100; the thickness of the positive plate 1 and the negative plate 3 is 70-200 μm, and the thickness of the diaphragm 2 is 5-30 μm. When the lithium ion battery is charged, the positive plate 1 needs to remove lithium ions, and the negative plate 3 is responsible for receiving the lithium ions, so that when the number of the negative plates 3 is set to be one more than that of the positive plates 1, the negative plates 3 can be ensured to completely receive the lithium ions removed from the positive plates 1; the thickness of the positive plate 1 and the negative plate 3 can not be too large or too small, if the thickness is too large, the current collector on the plates can also become thick, and the moving distance of lithium ions can be increased in the charging and discharging process, so that the internal resistance of the battery is increased; if the thickness is too small, the current collector on the pole piece is relatively reduced, and the capacity of the battery is influenced; in addition, diaphragm 2 has mainly played the spaced effect, when positive plate 1, diaphragm 2 and the 3 fifty percent discount of negative pole piece with the stack state, in order to avoid the 3 direct contact of negative pole piece at fifty percent discount face both ends, set up diaphragm 2 into 2n +2 layers, make the positive plate 1 of stack state, diaphragm 2 and negative pole piece 3's topmost layer all set up diaphragm 2 with the bottommost layer, guaranteed that the negative pole piece 3 of fifty percent discount face can be separated by diaphragm 2 after the fifty percent discount, improved naked electric core 0's security performance.

In addition, the widths of the positive plate 1, the negative plate 3 and the diaphragm 2 are set to be A, A +2mm and A +5mm in sequence, wherein A is more than or equal to 1 and less than or equal to 1000 mm; the lengths of the positive plate 1, the negative plate 3 and the diaphragm 2 are set to be B, B +2mm and B +5mm in sequence, wherein B is more than or equal to 1 and less than or equal to 400 mm. The area of the diaphragm 2 is larger than the areas of the positive plate 1 and the negative plate 3, so that the diaphragm 2 can effectively separate the positive plate 1 and the negative plate 3, the short circuit phenomenon in the battery caused by direct contact of the positive plate and the negative plate is prevented, and the safe operation of the battery is ensured; the area of the negative plate 3 is larger than that of the positive plate 1, so that a sufficient lithium inserting position can be provided for the negative plate 3, and further, the precipitation of lithium ions in the charging process is avoided.

According to the utility model discloses an among the naked electric core structure, positive plate 1 still is connected with positive tab 11, and negative pole piece 3 still is connected with negative pole ear 31, wherein, can set up to positive tab 11 and the negative pole ear 31 of different quantity on every layer of positive plate 1 and the negative pole piece 3. The following is a further description with reference to specific examples.

Example 1

As shown in fig. 4 to 6, in the present embodiment, the positive electrode tab 11 of each positive electrode tab 1 and the negative electrode tab 31 of the negative electrode tab 3 are provided as one tab. After positive plate 1, diaphragm 2 and negative plate 3 are stacked and folded, naked electric core 0 is formed, and the risk of powder falling from the bottom of naked electric core 0 and the space utilization rate of the top are reduced.

Wherein, in the 0 structure of above-mentioned naked electric core, positive ear 11 range upon range of positive ear that has formed positive ear group on every layer, and negative pole ear 31 has formed negative ear group, and positive ear group and negative ear group can be located naked electric core 0 with one side or relative one side.

It should be noted that the positive tab 11 and the negative tab 31 are both disposed at positions other than the symmetry axes of the positive and negative electrode sheets, i.e. at regions other than the folding line, so that the positive tab 11 and the negative tab 31 can be prevented from being damaged when folded in half.

Example 2

As shown in fig. 7 to 9, unlike embodiment 1, in this embodiment, two positive electrode tabs 11 and two negative electrode tabs 31 are respectively disposed on each layer of the positive electrode tab 1 and the negative electrode tab 3, and the two positive electrode tabs 11 of each layer are both located on the same side of the positive electrode tab 1, and the two negative electrode tabs 31 are also located on the same side of the negative electrode tab 3 and are respectively located on both sides of the symmetry axis. After laminating and folding the positive plate 1, the diaphragm 2 and the negative plate 3, the positive lugs 11 and the negative lugs 31 on each layer coincide one by one to form a positive lug group and a negative lug group of the bare cell 0, and compared with embodiment 1, the number of the positive lugs 11 and the number of the negative lugs 31 in the embodiment are all improved, so that the internal resistance of the battery is reduced, and the overcurrent capacity of the lugs is improved.

It can be understood that, in this embodiment, after being stacked and folded in half, the positive electrode tab group and the negative electrode tab group are respectively located at two opposite ends of the bare cell 0.

Example 3

As shown in fig. 10 to 12, similar to embodiment 2, but different from embodiment 2, in this embodiment, two positive electrode tabs 11 of each layer are respectively located on two adjacent sides of the positive electrode sheet 1, and two negative electrode tabs 31 are also respectively located on two adjacent sides of the negative electrode sheet 3, so that after being laminated and folded in half, the positive electrode tab group and the negative electrode tab group are respectively located on the same side of the bare cell 0. Compared with embodiment 1, the number of the positive electrode tabs 11 and the number of the negative electrode tabs 31 in the embodiment are also increased, and the effects of reducing the internal resistance of the battery and improving the overcurrent capacity of the tabs can be achieved.

Example 4

As shown in fig. 13, unlike embodiment 1, in this embodiment, only one of the positive electrode sheets 1 has a positive electrode tab 11, and one positive electrode tab 11 is provided, and the other positive electrode sheet 1 does not have a positive electrode tab 11. The other structures are the same as those of embodiment 1, and are not described again here.

Example 5

As shown in fig. 14, unlike example 1, in this example, only one of the positive electrode sheets 1 has two positive electrode tabs 11, and the other positive electrode sheet 1 does not have a positive electrode tab 11. The other structures are the same as those of embodiment 1, and are not described again here.

Example 6

As shown in fig. 15, unlike example 1, in this embodiment, only one of the positive electrode sheets 1 has a plurality of positive electrode tabs 11, and similarly, only one of the negative electrode sheets 3 has a plurality of negative electrode tabs 31, and other structures are the same as those in example 1, and are not repeated here.

Following through to coiling formula electric core structure with the utility model discloses well "half coiling formula half lamination formula"'s electric core structure carries out the vibration test, explains through the analysis to the pressure drop rate the utility model discloses the structure is preventing falling the promotion in the aspect of powder and energy density etc..

The following experiment uses 5214895 model lithium ion battery as the test object, and first each extracts 10 batteries and 10 of conventional coiling formula structure the utility model discloses well "half coiling formula half lamination formula"'s battery test initial pressure drop rate, concrete operation is: standing the battery for 12h, testing to obtain a voltage V1, continuing standing for 48h, testing to obtain a voltage V2, and calculating the voltage drop rate through a voltage drop rate formula: the pressure drop rate is (V1-V2)/48; secondly, performing a vibration test, and vibrating the batteries for 12 hours along the direction of the X, Y, Z axis respectively, wherein the vibration frequency is 5-100 Hz; thirdly, after the vibration test is finished, testing the pressure drop rate according to the operation of the step I again, and referring to the specific experimental parameters in the tables 1 and 2:

TABLE 1

Initial pressure drop rate:

TABLE 2

Pressure drop rate after vibration:

as can be seen from the experimental data in table 1, the initial voltage drop rate of the conventional winding-type cell that has not undergone the vibration test and the "half-winding-type half-lamination-type" cell of the present invention are both maintained between 0.03 and 0.05; after vibration testing, it can be known by comparing data in table 1 and table 2 that the voltage drop rate of the battery cell in the scheme is basically not changed obviously after vibration, and the voltage drop rate of the winding battery cell is doubled, which shows that the pole piece in the traditional battery cell has the phenomenon of powder falling, resulting in micro short circuit inside the battery, and the voltage drop is increased.

The utility model also provides a battery, including at least one naked electric core, this naked electric core is above-mentioned naked electric core 0 in one section wantonly. The structure of the naked electric core 0 is applied to the battery, so that the energy density and the safety performance of the battery are effectively improved.

The utility model provides a naked electric core simple manufacture, specific preparation method is as follows:

step 1, alternately laminating a plurality of layers of positive plates 1, diaphragms 2 and negative plates 3 in sequence, wherein the top layer and the bottom layer are both diaphragms 2;

step 2, folding the positive plate 1, the diaphragm 2 and the negative plate 3 in half to form a naked electric core 0;

and 3, adhering and fixing an adhesive tape 4 on at least one edge except the folded end of the naked electric core 0 to fix the naked electric core 0.

The utility model discloses an adopt the method of fifty percent discount to make positive plate 1, diaphragm 2 and negative pole piece 3 form naked electric core 0, both avoided the coiling edge corner of pole piece among the traditional coiling technology to appear tension inequality easily, and then lead to cracked problem, simultaneously, also avoided in the lamination technology because the more problem of pole piece edge burr that the fit-up gap of cross cutting equipment leads to, improved the security performance of battery widely.

While the foregoing description shows and describes several preferred embodiments of the invention, it is to be understood, as noted above, that the invention is not limited to the forms disclosed herein, but is not intended to be exhaustive of other embodiments, and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed above, or as otherwise known in the relevant art. But that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention, which is to be limited only by the claims appended hereto.

Claims (9)

1. The utility model provides a naked electric core, its characterized in that: including positive plate (1), diaphragm (2) and negative pole piece (3) of range upon range of setting, diaphragm (2) set up in positive plate (1) with between negative pole piece (3), positive plate (1) diaphragm (2) with negative pole piece (3) form through the fifty percent discount naked electric core (0).

2. The bare cell of claim 1, wherein: the bare cell (0) is bonded with a piece of fixed adhesive paper (4) on at least one edge except the folded end, and the thickness of the fixed adhesive paper (4) is 10-100 mu m.

3. The bare cell of claim 1, wherein: the number of the positive plates (1), the number of the negative plates (3) and the number of the diaphragms (2) are n, n +1 and 2n +2 respectively, wherein n is a natural number and is more than or equal to 1 and less than or equal to 100.

4. The bare cell of claim 1, wherein: the thickness of the positive plate (1) and the thickness of the negative plate (3) are both 70-200 mu m, and the thickness of the diaphragm (2) is 5-30 mu m.

5. The bare cell of claim 1, wherein: the widths of the positive plate (1), the negative plate (3) and the diaphragm (2) are set to be A, A +2mm and A +5mm in sequence, wherein A is more than or equal to 1 and less than or equal to 1000 mm; the lengths of the positive plate (1), the negative plate (3) and the diaphragm (2) are set to be B, B +2mm and B +5mm in sequence, wherein B is more than or equal to 1 and less than or equal to 400 mm.

6. The bare cell of claim 2, wherein: positive plate (1) is connected with positive tab (11), negative pole piece (3) are connected with negative pole ear (31), naked electric core (0) is its be provided with on at least one edge beyond the end of folio positive tab (11) and/or negative pole ear (31).

7. The bare cell of claim 1, wherein: the shapes of the positive plate (1), the diaphragm (2) and the negative plate (3) are all axisymmetric figures.

8. The bare cell of claim 1, wherein: the two sides of the folding position of the naked electric core (0) form an included angle alpha, and the range of the alpha is 0-90 degrees.

9. A battery, characterized by: naked electric core including at least one, naked electric core be claim 1 ~ 8 in any one naked electric core.

Images