CN105470587B - Nickel-hydrogen secondary battery - Google Patents
Nickel-hydrogen secondary battery Download PDFInfo
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- CN105470587B CN105470587B CN201410451767.6A CN201410451767A CN105470587B CN 105470587 B CN105470587 B CN 105470587B CN 201410451767 A CN201410451767 A CN 201410451767A CN 105470587 B CN105470587 B CN 105470587B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention provides a nickel-hydrogen secondary battery, which comprises an electrode group, an electrolyte and a battery case, wherein the electrode group is formed by laminating a positive plate, a first diaphragm, a negative plate and a second diaphragm in the order and winding the positive plate, the first diaphragm, the negative plate and the second diaphragm on a winding core, the negative plate is formed by laminating a first negative plate and a second negative plate, the first negative plate comprises a first negative current collector and a first negative material layer formed on two surfaces of the first negative current collector, and the second negative plate comprises a second negative current collector and a second negative material layer formed on two surfaces of the second negative current collector. According to the present invention, various negative electrode active materials can be easily used in combination, the combination of the negative electrode active materials can be easily changed, the waste of the negative electrode material is small, the design is strong, and the utilization rate of the negative electrode active material of the nickel-hydrogen secondary battery can be easily improved.
Description
Technical Field
The present invention relates to a nickel-hydrogen secondary battery.
Background
The nickel-hydrogen secondary battery is a new generation of high-energy alkaline secondary battery following the nickel-cadmium battery, and has the characteristics of high capacity, high power, no pollution and the like, so the nickel-hydrogen secondary battery has a very good application prospect.
A nickel-hydrogen secondary battery generally includes an electrode group and an alkaline electrolyte sealed in a battery case. The electrode group comprises a positive plate, a negative plate and a clapboard. The positive electrode sheet includes a positive electrode current collector and a positive electrode material layer coated on the positive electrode current collector, the positive electrode material layer containing a positive electrode active material, which is typically nickel hydroxide, and a binder. The negative electrode sheet includes a negative electrode current collector and a negative electrode material layer coated on the negative electrode current collector, the negative electrode material layer containing a negative electrode active material, which is typically a hydrogen storage alloy, and a binder. The separator is arranged between the positive plate and the negative plate, and has electrical insulation and liquid retention.
Conventionally, as shown in patent document 1, a negative electrode material layer is generally formed on both surfaces of a negative electrode current collector. The composition of the anode material layer formed on both sides of the anode current collector is generally the same, and the thickness is also generally the same. In order to improve battery performance, it is sometimes necessary to mix different negative electrode active materials and directly prepare a negative electrode material paste and apply the paste to a current collector. However, the present inventors have found that some negative electrode active materials which are difficult to blend and use cannot be used, and that when it is necessary to replace one of the negative electrode active materials or adjust the amount of the negative electrode active material in order to further improve the battery performance, a new paste of the negative electrode material needs to be prepared, and the paste prepared previously cannot be used any longer. Therefore, there are problems that replacement of the negative electrode active material is difficult, time is consumed, and waste of the negative electrode material is likely to occur.
In addition, as shown in fig. 4 and 5, a conventional electrode group using such a negative electrode sheet is generally configured by stacking a positive electrode sheet 5, a first separator 6, a negative electrode sheet 7, and a second separator 8 in this order to form a stack sheet 9, and winding the stack sheet 9 around a winding core to form a wound electrode group. In such a wound electrode group, the negative electrode sheet alone is formed at both the innermost and outermost circles of the electrode group. The negative electrode material layer on one surface of the innermost ring of the negative electrode sheet is opposite to the peripheral surface of the winding core, and the negative electrode material layer on one surface of the outermost ring of the negative electrode sheet is opposite to the inner wall surface of the battery shell. The present inventors have found that such an electrode group has a problem that the utilization rate of the active material in the negative electrode material layer is low.
Documents of the prior art
Patent document 1: chinese invention patent CN101589491A
Disclosure of Invention
The present invention has been made to solve the above problems, and an object of the present invention is to provide a nickel-hydrogen secondary battery having a negative electrode structure in which various negative electrode active materials can be easily used in combination, the combination of the negative electrode active materials can be easily changed, the waste of the negative electrode material is reduced, and the design is strong. Another object of the present invention is to provide a nickel-metal hydride secondary battery having a high utilization rate of the negative electrode active material of the negative electrode sheet.
The present invention provides a nickel-hydrogen secondary battery comprising an electrode group, an electrolyte, and a battery case, wherein the electrode group is formed by laminating a positive electrode sheet, a first separator, a negative electrode sheet, and a second separator in this order and winding the laminate on a winding core, and is characterized in that the negative electrode sheet is formed by laminating a first negative electrode sheet and a second negative electrode sheet, the first negative electrode sheet includes a first negative electrode current collector and a first negative electrode material layer formed on both surfaces of the first negative electrode current collector, and the second negative electrode sheet includes a second negative electrode current collector and a second negative electrode material layer formed on both surfaces of the second negative electrode current collector.
In the nickel-metal hydride secondary battery according to the present invention, it is preferable that both ends of the first negative electrode sheet in the longitudinal direction do not overlap both ends of the second negative electrode sheet in the longitudinal direction.
In the nickel-metal hydride secondary battery according to the present invention, it is preferable that the distance between the end of the first negative electrode sheet and the end of the second negative electrode sheet is greater than 0 and equal to or less than the circumferential length of the winding core on the winding start end side of the electrode group, and the distance between the end of the first negative electrode sheet and the end of the second negative electrode sheet is greater than 0 and equal to or less than the inner circumferential length of the battery case on the winding end side of the electrode group.
In the nickel-hydrogen secondary battery according to the present invention, it is preferable that a distance between an end of the first negative electrode sheet and an end of the second negative electrode sheet on a winding start end side of the electrode group is a circumferential length of the winding core, and a distance between an end of the first negative electrode sheet and an end of the second negative electrode sheet on a winding end side of the electrode group is an inner circumferential length of the battery case.
In the nickel-hydrogen secondary battery according to the present invention, it is preferable that both ends of the second negative electrode sheet are located inside both ends of the first negative electrode sheet, the first negative electrode sheet is in contact with the second separator, and the first negative electrode sheet is in contact with an inner wall surface of the battery case on a winding end side of the electrode group.
In the nickel-hydrogen secondary battery of the present invention, it is preferable that the first negative electrode active material contained in the first negative electrode material layer is different from the second negative electrode active material contained in the second negative electrode material layer.
Effects of the invention
According to the aspect of the present invention, various negative electrode active materials can be easily used in combination, the combination of the negative electrode active materials can be easily changed, waste of the negative electrode material is reduced, and design is strong. Further, according to a preferred embodiment of the present invention, the utilization rate of the negative electrode active material of the nickel-hydrogen secondary battery can be effectively improved. In addition, in the nickel-hydrogen secondary battery of the present invention, the negative electrode sheet is formed by laminating two negative electrode sheets, and the manufacturing difficulty is not increased as compared with the conventional negative electrode sheet.
Drawings
Fig. 1 is a schematic view showing an example of the negative electrode sheet of the present invention.
Fig. 2 is a schematic view showing an example of a stacked state of the electrode group of the present invention.
Fig. 3 is a schematic view showing a wound state of the electrode group of the present invention.
Fig. 4 is a schematic view showing a stacked state of an electrode group of a comparative example.
Fig. 5 is a schematic view showing a wound state of an electrode group of a comparative example.
Description of the reference numerals
1 negative electrode plate, 11 first negative electrode plate, 12 second negative electrode plate, 2 positive electrode plate, 3 first diaphragm and 4 second diaphragm
Detailed Description
The nickel-metal hydride secondary battery of the present invention will be described in detail with reference to the accompanying drawings.
The nickel-hydrogen secondary battery of the present invention includes an electrode group, an electrolyte, and a battery case, wherein the electrode group is formed by laminating a positive electrode sheet, a first separator, a negative electrode sheet, and a second separator in this order and winding the same around a winding core, the negative electrode sheet is formed by laminating a first negative electrode sheet including a first negative electrode current collector and a first negative electrode material layer formed on both surfaces of the first negative electrode current collector and a second negative electrode sheet including a second negative electrode current collector and a second negative electrode material layer formed on both surfaces of the second negative electrode current collector.
The negative electrode sheet of the present invention is formed by stacking the first negative electrode sheet and the second negative electrode sheet, and by forming the negative electrode sheet in such a special structure, it is possible to easily use various negative electrode active materials in combination, and the combination of the negative electrode active materials is easily changed, the waste of the negative electrode material is small, and the design property is greatly improved.
The lamination form of the first negative electrode sheet and the second negative electrode sheet is not particularly limited, and the first negative electrode sheet and the second negative electrode sheet may be left as they are without being particularly subjected to a bonding treatment such as adhesion. Further, when the electrode group is produced, the separator, the positive electrode sheet, and the like may be further laminated and wound. Therefore, the negative plate of the invention also has the advantages of easy manufacture and no increase of the manufacturing cost of the battery.
In the present invention, it is preferable that both ends of the negative electrode sheet are constituted by only the first negative electrode sheet or the second negative electrode sheet by not overlapping both ends of the first negative electrode sheet in the longitudinal direction with both ends of the second negative electrode sheet in the longitudinal direction. By forming such a special structure, the amounts of the negative electrode material facing the outer peripheral surface of the winding core and the negative electrode material facing the inner wall surface of the battery case can be reduced, and the amounts of the negative electrode active materials at both ends of the negative electrode sheet can be effectively reduced, so that the utilization rate of the negative electrode active material of the nickel-hydrogen secondary battery can be simply and effectively improved.
As a specific example of such a preferable negative electrode sheet, the negative electrode sheet 1 shown in (a) to (d) of fig. 1 can be cited.
In the negative electrode tab 1 of fig. 1(a), the left end of the first negative electrode tab 11 exceeds the left end of the second negative electrode tab 12, and the right end of the second negative electrode tab 12 exceeds the right end of the first negative electrode tab 11 in the longitudinal direction (left-right direction in the figure) of the negative electrode tab 1. In the negative electrode tab 1 of fig. 1(b), the left end of the second negative electrode tab 12 exceeds the left end of the first negative electrode tab 11, and the right end of the first negative electrode tab 11 exceeds the right end of the second negative electrode tab 12 in the longitudinal direction (left-right direction in the figure) of the negative electrode tab 1. In the negative electrode sheet 1 of fig. 1(c), both ends of the first negative electrode sheet 11 are within both ends of the second negative electrode sheet 12 in the longitudinal direction (left-right direction in the drawing) of the negative electrode sheet 1. In the negative electrode sheet 1 of fig. 1(d), both ends of the second negative electrode sheet 12 are within both ends of the first negative electrode sheet 11 in the longitudinal direction (left-right direction in the drawing) of the negative electrode sheet 1.
In the above specific example of the negative electrode sheet 1, the negative electrode sheet shown in fig. 1(d) is preferable, and the first negative electrode sheet 11 in fig. 1(d) is preferably brought into contact with the second separator. When the negative electrode sheet is adopted, the stress generated by the winding and bending of the starting end and the tail end of the second negative electrode sheet 12 and the diaphragm can be avoided, so that the diaphragm can be prevented from being punctured under the condition that burrs exist at the starting end and the tail end of the second negative electrode sheet, and the internal short circuit of the battery can be prevented.
In the present invention, it is preferable that a distance between an end of the first negative electrode sheet and an end of the second negative electrode sheet on a winding start end side of the electrode group is greater than 0 and equal to or less than a circumferential length of the winding core (i.e., an outer circumferential length of the winding core), and a distance between an end of the first negative electrode sheet and an end of the second negative electrode sheet on a winding end side of the electrode group is greater than 0 and equal to or less than an inner circumferential length of the battery case. When the right end of the negative electrode sheet 1 is used as the winding start end, the left end of the negative electrode sheet 1 is used as the winding end, and the first negative electrode sheet 11 is in contact with the second separator as shown in fig. 1(a) to (d), the distance between the right end of the first negative electrode sheet 11 and the right end of the second negative electrode sheet 12 is preferably greater than 0 and equal to or less than the circumferential length of the winding core, and the distance between the left end of the first negative electrode sheet 11 and the left end of the second negative electrode sheet 12 is preferably greater than 0 and equal to or less than the inner circumferential length of the battery case.
Further, in order to sufficiently improve the utilization rate of the negative electrode active material, it is more preferable that the distance between the end of the first negative electrode sheet and the end of the second negative electrode sheet on the winding start end side of the electrode group be the circumferential length of the winding core, and the distance between the end of the first negative electrode sheet and the end of the second negative electrode sheet on the winding end side of the electrode group be the inner circumferential length of the battery case.
In the present invention, since the distance between the end of the first negative electrode tab 11 and the end of the second negative electrode tab 12 can vary within a certain range, the lengths of the first negative electrode tab 11 and the second negative electrode tab 12 of the present invention can be selected within a certain range, and it is not necessary to limit the length of the negative electrode tabs to a certain length as in the prior art, and therefore, some negative electrode tabs that do not conform to the predetermined length in the prior art can be effectively used in the present invention, and the rejection rate of the negative electrode tabs can be greatly reduced.
In the present invention, the first negative electrode sheet includes a first negative electrode collector and first negative electrode material layers formed on both surfaces of the first negative electrode collector, the first negative electrode material layers include a first negative electrode active material and a binder, the second negative electrode sheet includes a second negative electrode collector and second negative electrode material layers formed on both surfaces of the second negative electrode collector, and the second negative electrode material layers include a second negative electrode active material and a binder.
The composition of the negative electrode material layer included in the first and second negative electrode sheets and the content of the negative electrode active material in the negative electrode material layer may be appropriately selected by those skilled in the art according to the amount of the positive electrode active material in the positive electrode sheet of the nickel-hydrogen secondary battery, and is not particularly limited.
The thickness and the capacity packing density of the first negative electrode sheet and the second negative electrode sheet are preferably set in the following manner.
When the nickel-hydrogen secondary battery adopting the single negative pole piece in the prior art is changed into the nickel-hydrogen secondary battery adopting the double negative pole pieces, the length of the single negative pole piece of the nickel-hydrogen secondary battery in the prior art is set as c, and the thickness is set as H1The volumetric filling density is set to Q1(ii) a The thickness of the first negative electrode piece and the thickness of the second negative electrode piece are both set to be H2The volumetric filling densities are all set to Q2(ii) a Let the outer circumference of the winding core be a (a ═ π D)1，D1Core diameter), the inner circumference of the battery can is b (b ═ pi D)2，D2The inner diameter of the battery shell); the width of the first negative plate and the width of the second negative plate are equal to the width of the single negative plate, and the single negative plate, the first negative plate and the second negative plate all adopt the same current collectors.
In this case, it is preferable that the thicknesses of the electrode plates of the first negative electrode sheet and the second negative electrode sheet satisfy the following formula 1, so that the total volume of the negative electrodes of the nickel-hydrogen secondary battery using the double negative electrode sheets according to the present invention is equal to the total volume of the negative electrodes of the nickel-hydrogen secondary battery using the single negative electrode sheet according to the related art.
cH1＝(2c－a－b)H2Formula 1
In addition, it is preferable that the capacity packing density of the first negative electrode sheet and the second negative electrode sheet satisfies the following formula 2, so that the total negative electrode packing energy of the nickel-hydrogen secondary battery using the double negative electrode sheets according to the present invention is equal to the negative electrode packing energy of the nickel-hydrogen secondary battery using the single negative electrode sheet according to the related art.
H1Q1＝2H2Q2Formula 2
In the present invention, the types of the first negative electrode active material and the second negative electrode active material may be selected as needed, and a preferable example is. AB may be used for the first negative electrode active material and the second negative electrode active material5Alloy, AB3Any of hydrogen occluding alloys such as alloys, and the composition of alloying elements or treatment conditions can be appropriately adjusted; the first negative electrode active material and the second negative electrode active material may be the same or different. In order to improve the performance of the nickel-hydrogen secondary battery, it is preferable that the first negative electrode active material and the second negative electrode active material are different in kind.
The negative electrode sheet of the present invention is configured by stacking two negative electrode sheets, and thus, negative electrode sheets containing different negative electrode active materials can be used in combination, and the performance of the battery can be further improved. In addition, any negative electrode sheet can be combined for use, so that even unqualified negative electrode sheets with light weight or heavy weight in the manufacturing process of the negative electrode sheet can be effectively utilized in the electrode group, and the waste of the negative electrode sheet material in the manufacturing process of the nickel-hydrogen battery can be effectively reduced.
The binder may be any binder used in the negative electrode sheet of a nickel-hydrogen secondary battery, and is not particularly limited. For example, any of thermoplastic resins and thermosetting resins can be used. Examples of the thermoplastic resin include styrene-butadiene rubber, polyethylene, polypropylene, polytetrafluoroethylene, polyvinylidene fluoride, and tetrafluoroethylene-hexafluoropropylene copolymer. The content of the binder is not particularly limited, and may be selected as needed.
The first and second negative electrode material layers of the present invention may contain additives commonly used in nickel-metal hydride secondary batteries, such as a conductive agent and a thickener, in addition to the negative electrode active material and the binder.
The conductive agent may be, for example, graphite, carbon black, conductive fibers, etc., and the content thereof is not particularly limited and may be selected as needed.
The thickener may be, for example, carboxymethyl cellulose or a modified product thereof, polyvinyl alcohol, methyl cellulose, polyethylene oxide, or the like, and the content thereof is not particularly limited and may be selected as needed.
In addition, the first negative electrode current collector and the second negative electrode current collector may be various current collectors used in a nickel-metal hydride battery. For example, a copper mesh, a punched nickel-plated steel strip, or the like can be used.
The first anode material layer and the second anode material layer may be formed by applying a paste containing an anode active material, a binder, a conductive agent and a thickener used as needed, and a solvent onto an anode current collector and drying.
In the nickel-hydrogen secondary battery of the present invention, other components of the battery, except for the negative electrode tab, may be the same as those used in the prior art nickel-hydrogen secondary battery.
The positive electrode sheet used in the present invention is not particularly limited, and various positive electrode sheets conventionally used in nickel-metal hydride batteries can be used.
In the electrode assembly of the present invention, the first separator and the second separator may be various separators used in nickel-metal hydride batteries, and may be nonwoven fabrics made of polyolefin such as polypropylene, for example.
As a preferred embodiment of the electrode assembly of the present invention, as shown in fig. 2, a positive electrode sheet 2, a first separator 3, a second negative electrode sheet 12, a first negative electrode sheet 11, and a second separator 4 are sequentially laminated in this order to form a laminate sheet, both ends in the longitudinal direction of the second negative electrode sheet 12 are located within both ends in the longitudinal direction of the first negative electrode sheet 11, one end of the laminate sheet (i.e., the left end of the laminate sheet shown in fig. 2) is used as the winding start end of the electrode assembly, the distance between the end of the second negative electrode sheet 12 and the end of the first negative electrode sheet 11 is greater than 0 and equal to or less than the outer circumferential length of the winding core on the winding start end side, and the distance between the end of the second negative electrode sheet 12 and the end of the first negative electrode sheet 11 is greater than 0 and equal to or less than the inner circumferential length of the battery case on the other winding end side of the laminate sheet. Further, as shown in fig. 3, the laminate sheet shown in fig. 2 is wound around a winding core (the winding core is not shown in the figure) to form a wound electrode group. In the nickel-hydrogen secondary battery using the electrode group, at least a part of the negative electrode tab facing the outer peripheral surface of the winding core is constituted only by the first negative electrode tab 11, and at least a part of the negative electrode tab facing the inner wall surface of the battery case is constituted only by the first negative electrode tab 11.
The present invention will be described in more detail by way of examples.
Examples
Example 1
1. Production of negative plate
Forming a first negative electrode material layer (wherein the negative electrode active material is (LaCe)) on both sides of a first negative electrode current collector (punched nickel-plated steel strip)1Ni4.04Co0.45(MnAl)0.68) The length, width, thickness and capacity density are shown in table 1 below. A second negative electrode sheet was fabricated in the same manner as the first negative electrode sheet, and the length, width, thickness and capacity density thereof are shown in table 1 below.
TABLE 1
2. Manufacture of positive plate
A positive electrode sheet (75.0 mm, 43.7mm, 0.85mm in length, width and thickness, respectively) using nickel hydroxide as a positive electrode active material was produced, and the designed capacity of the positive electrode was 2000 mAh.
3. Manufacture of electrode assembly
As shown in fig. 2, the positive electrode sheet, the first separator (sulfonated polypropylene nonwoven fabric having a length × width of 130mm × 43.7mm), the second negative electrode sheet, the first negative electrode sheet, and the second separator (sulfonated polypropylene nonwoven fabric having a length × width of 114mm × 43.7mm) were sequentially laminated in this order to prepare a laminate sheet, and the laminate sheet was wound around a winding core to prepare an electrode group. Wherein, on the winding start end side of the electrode group, the distance between the end part of the first negative electrode sheet and the end part of the second negative electrode sheet is equal to the outer circumference of the winding core; on the winding end side of the electrode group, the distance between the end of the first negative electrode sheet and the end of the second negative electrode sheet is equal to the inner circumference of the battery case.
4. Production of nickel-hydrogen secondary battery
The electrode assembly is inserted into a steel shell, electrolyte (mixed solution of KOH and NaOH) is injected, and then sealing is carried out, finally the standard AA type nickel-hydrogen secondary battery A1 is manufactured, wherein the total height is 51.05mm, the outer diameter is 14.10mm, and the standard capacity is 2000 mAh.
Example 2
A nickel-metal hydride secondary battery was fabricated in the same manner as in example 1, except that the negative electrode active material in the second negative electrode sheet was changed to (LaCe)1Ni3.57Co0.73(MnAl)0.71Thus, a nickel-hydrogen secondary battery a2 was obtained.
Comparative example 1
A nickel-metal hydride secondary battery D1 was produced in the same manner as in example 1, except that a single negative electrode sheet 6 was used as the negative electrode sheet as shown in fig. 4 and 5. The negative electrode sheet 6 was manufactured in the same manner as in the method for manufacturing the first negative electrode sheet of example 1, and satisfies the relationships of expressions 1 and 2 described in the detailed description as the first negative electrode sheet and the second negative electrode sheet in example 1. The negative electrode sheet 6 had a length of 114mm, a width of 43.7mm and a thickness of 0.37 mm.
Next, the following performance tests were performed on the nickel-metal hydride secondary batteries obtained in the above examples and comparative examples, and the test results are shown in tables 2 to 4 below.
Performance testing
1. Normal temperature discharge rate performance
① Standard Capacity determination:
the test conditions were as follows
Ambient temperature: 20 deg.C
a. Pre-discharging: 0.2It discharge to 1.0V;
b. standing for 1 hour after the discharge is finished, and charging for 16 hours at 0.1 It;
c. standing for 1 hour after charging, and discharging to 1.0V at 0.2 It;
d. reading the discharge capacity of the step C to obtain the standard capacity C1。
② 1It discharge capacity measurement:
the test conditions were as follows
Ambient temperature: 20 deg.C
a. Pre-discharging: 1It is discharged to 1.0V;
b. standing for 0.5 hour after the discharge is finished, charging at 1It until the voltage is- △ V is 5 mV;
c. standing for 0.5 hour after charging, and discharging to 1.0V at 1 It;
d. reading the discharge capacity C of "C step2。
③ 1 ratio of It discharge capacity to 0.2It discharge capacity ═ C2/C1×100％
2. High temperature discharge performance
Discharge capacity determination at ① 20 ℃ of:
the test conditions were as follows
Ambient temperature: 20 deg.C
a. Pre-discharging: 1It is discharged to 1.0V;
b. standing for 0.5 hour after the discharge is finished, charging at 1It until the voltage is- △ V is 5 mV;
c. standing for 0.5 hour after charging, and discharging to 1.0V at 1 It;
d. reading the discharge capacity C of "C step2。
② 65 ℃ discharge capacity measurement:
the test conditions were as follows
Charging environment temperature: 20 ℃; discharge electrical environment temperature: 65 deg.C
Pre-discharge at 20 ℃: 1It is discharged to 1.0V;
b. standing for 0.5 hour after the discharge is finished, charging at 1It until the voltage is- △ V is 5 mV;
c. adjusting the ambient temperature to 65 deg.C after charging, standing for 3 hr, and discharging at 1It to 1.0V
d. Reading the discharge capacity C of "C step3
The ratio of ③ 65 ℃ discharge capacity to 20 ℃ discharge capacity ═ C3/C2×100％
3. Low temperature discharge performance
Discharge capacity determination at ① 20 ℃ of:
the test conditions were as follows
Ambient temperature: 20 deg.C
a. Pre-discharging: 1It is discharged to 1.0V;
b. standing for 0.5 hour after the discharge is finished, charging at 1It until the voltage is- △ V is 5 mV;
c. standing for 0.5 hour after charging, and discharging to 1.0V at 1 It;
d. reading the discharge capacity C of "C step2。
Discharge capacity determination at ② -20 deg.C:
the test conditions were as follows
Charging environment temperature: 20 ℃; discharge environment temperature: -20 ℃ C
Pre-discharge at 20 ℃: 1It is discharged to 1.0V;
b. standing for 0.5 hour after the discharge is finished, charging at 1It until the voltage is- △ V is 5 mV;
c. adjusting the ambient temperature to-20 deg.C after charging, standing for 3 hr, and discharging at 1It to 1.0V
d. Reading "C step" discharge capacity C4
The ratio of ③ -20 ℃ discharge capacity to 20 ℃ discharge capacity ═ C4/C2×100％
4. Life performance
① test conditions were as follows
Ambient temperature: 20 deg.C
a. Pre-discharging: 1It is discharged to 1.0V;
b. standing for 0.5 hour after the discharge is finished, charging at 1It until the voltage is- △ V is 5 mV;
c. standing for 0.5 hour after charging, and discharging to 1.0V at 1 It;
d. standing for 0.5 hour after the discharge is finished;
e.b-c-d cycle charging and discharging 200 times
d. Reading the discharge capacity c of each discharge step1、c2、c3...c200
② dimension of capacity at n-th cycleRetention rate cn/c1×100％
TABLE 2
TABLE 3
TABLE 4
As can be seen from the data in tables 2 to 4, the nickel-metal hydride secondary battery using the double negative electrode sheet in example 1 of the present invention is similar to the nickel-metal hydride secondary battery using the single negative electrode sheet in comparative example 1 in terms of the normal-temperature discharge rate performance, the high-low temperature discharge performance, and the life performance. In example 2 of the present invention, the life performance of the battery can be further improved by using different negative electrode active materials in combination. In addition, it is important that the nickel-hydrogen secondary batteries of examples 1 and 2 of the present invention have a significantly reduced amount of the negative electrode active material compared to the nickel-hydrogen secondary battery of comparative example 1, and the utilization rate of the negative electrode active material is improved.
Claims (6)
1. A nickel-hydrogen secondary battery comprising an electrode group, an electrolyte and a battery case, wherein the electrode group is formed by stacking a positive electrode sheet, a first separator, a negative electrode sheet and a second separator in this order and winding them around a winding core,
the negative electrode sheet is formed by laminating a first negative electrode sheet including a first negative electrode collector and first negative electrode material layers formed on both faces of the first negative electrode collector and a second negative electrode sheet including a second negative electrode collector and second negative electrode material layers formed on both faces of the second negative electrode collector,
the two ends of the first negative plate in the length direction are not overlapped with the two ends of the second negative plate in the length direction.
2. The nickel-hydrogen secondary battery according to claim 1, characterized in that, on a winding start end side of the electrode group, a distance between an end of the first negative electrode sheet and an end of the second negative electrode sheet is greater than 0 and equal to or less than a circumferential length of the winding core,
on the winding end side of the electrode group, the distance between the end of the first negative electrode tab and the end of the second negative electrode tab is greater than 0 and equal to or less than the inner circumference of the battery case.
3. The nickel-hydrogen secondary battery according to claim 2, characterized in that, on the winding start end side of the electrode group, the distance between the end of the first negative electrode sheet and the end of the second negative electrode sheet is the circumference of the winding core,
the distance between the end of the first negative electrode tab and the end of the second negative electrode tab at the winding end side of the electrode group is the inner circumference of the battery case.
4. A nickel-hydrogen secondary battery according to claim 2 or 3, characterized in that both ends of the second negative electrode sheet are located inside both ends of the first negative electrode sheet, the first negative electrode sheet is in contact with the second separator, and the first negative electrode sheet is in contact with the inner wall surface of the battery case on the winding end side of the electrode group.
5. The nickel-hydrogen secondary battery according to claim 1, characterized in that a first anode active material contained in the first anode material layer is different from a second anode active material contained in the second anode material layer.
6. The nickel-metal hydride secondary battery according to claim 5, wherein the first negative electrode active material is (LaCe)1Ni4.04Co0.45(MnAl)0.68The second negative active material is (LaCe)1Ni3.57Co0.73(MnAl)0.71。
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410451767.6A CN105470587B (en) | 2014-09-05 | 2014-09-05 | Nickel-hydrogen secondary battery |
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| CN201410451767.6A CN105470587B (en) | 2014-09-05 | 2014-09-05 | Nickel-hydrogen secondary battery |
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| CN108199009B (en) * | 2017-12-29 | 2020-05-15 | 东莞市朗泰通实业有限公司 | Low-temperature nickel-hydrogen battery with negative electrode double-sided coating |
| CN113871680A (en) * | 2020-06-30 | 2021-12-31 | 松山湖材料实验室 | Winding type battery and winding method thereof |
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| CN2570999Y (en) * | 2002-08-06 | 2003-09-03 | 比亚迪股份有限公司 | Alkaline secondary cell |
| CN102332559A (en) * | 2010-07-12 | 2012-01-25 | 三洋电机株式会社 | Negative electrode for nonaqueous electrolyte secondary battery and nonaqueous electrolyte secondary battery |
| CN102376902A (en) * | 2010-08-10 | 2012-03-14 | 日立车辆能源株式会社 | Sealing construction for secondary cell |
| CN103413975A (en) * | 2013-07-30 | 2013-11-27 | 河南比得力高新能源科技有限公司 | Lithium nickel cobalt manganate cylindrical high-rate battery and preparation method thereof |
| CN204130654U (en) * | 2014-09-05 | 2015-01-28 | 松下能源(无锡)有限公司 | Nickel-hydrogen secondary cell |
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| JP2000030699A (en) * | 1998-07-10 | 2000-01-28 | Toshiba Battery Co Ltd | Nickel-hydrogen secondary battery |
| JP2001135310A (en) * | 1999-10-29 | 2001-05-18 | Toshiba Battery Co Ltd | Producing method of paste hydrogen absorption alloy electrode, and producing method of angular alkaline secondary battery |
| JP4345810B2 (en) * | 2006-12-27 | 2009-10-14 | ソニー株式会社 | Secondary battery electrode, method for manufacturing the same, and secondary battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2570999Y (en) * | 2002-08-06 | 2003-09-03 | 比亚迪股份有限公司 | Alkaline secondary cell |
| CN102332559A (en) * | 2010-07-12 | 2012-01-25 | 三洋电机株式会社 | Negative electrode for nonaqueous electrolyte secondary battery and nonaqueous electrolyte secondary battery |
| CN102376902A (en) * | 2010-08-10 | 2012-03-14 | 日立车辆能源株式会社 | Sealing construction for secondary cell |
| CN103413975A (en) * | 2013-07-30 | 2013-11-27 | 河南比得力高新能源科技有限公司 | Lithium nickel cobalt manganate cylindrical high-rate battery and preparation method thereof |
| CN204130654U (en) * | 2014-09-05 | 2015-01-28 | 松下能源(无锡)有限公司 | Nickel-hydrogen secondary cell |
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