Sealed valve-regulated lead-acid battery

Abstract

A sealed valve-regulated lead-acid battery includes a plurality of electrode units, a plurality of separator groups and electrolyte. Each electrode unit includes a cathode plate and an anode plate. Each separator group includes a first separator unit and a second separator unit disposed on the anode plate of each electrode unit, and the basis weight range of the first separator unit is from 120 g / m2 to 200 g / m2, the basis weight range of the second separator unit is from 10 g / m2 to 40 g / m2, and the ratio range of the basis weight of the first separator unit to the second separator unit is from 3 to 20. By arranging the first separator unit and the second separator unit at specific positions, using the first separator unit and the second separator unit within a specific basis weight range, and controlling the basis weight ratio thereof to be from 3 to 20, the electrolyte can be easily diffused, and the generation of lead dendrites causing short circuit can be avoided.

Description

Technical Field

[0001] The present invention relates to a battery, and particularly to a sealed valve-regulated lead-acid battery. Background Art

[0002] In the prior art, in order to reduce the impedance of a sealed valve-regulated lead-acid battery, a trough body can be cooperated with a plurality of cathode plates and a plurality of anode plates to mutually extrude, and then pressure is applied to a plurality of separators respectively disposed between the cathode plates and the anode plates and impregnated with electrolyte to achieve the purpose of reducing the impedance. However, if the applied pressure is insufficient, not only the impedance of the sealed valve-regulated lead-acid battery cannot be reduced, but on the contrary, the impedance will increase. Therefore, usually, the pressure applied to the separators is increased to ensure that the impedance of the sealed valve-regulated lead-acid battery can be effectively reduced. However, this will lead to the problem that due to the relatively large applied pressure, the electrolyte is not easily diffused between the separators, resulting in excessive lead sulfate accumulating in the sealed valve-regulated lead-acid battery, and then lead dendrites are formed, causing a short circuit in the sealed valve-regulated lead-acid battery.

[0003] Japanese Patent Publication No. 2014107192A discloses a sealed valve-regulated lead-acid battery, which prevents the problem of lead dendrite formation and short circuit by disposing a sulfuric acid metal salt and boric acid in the region between the separator and the electrode, wherein the metal in the sulfuric acid metal salt is an alkali metal or an alkaline earth metal. Summary of the Invention

[0004] The first object of the present invention is to provide a sealed valve-regulated lead-acid battery capable of preventing the generation of lead dendrites. The sealed valve-regulated lead-acid battery of the present invention includes a plurality of electrode units, a plurality of separator groups, and an electrolyte. Each electrode unit includes a cathode plate and an anode plate disposed at intervals from the cathode plate. The separator groups separate the cathode plates from the anode plates, and each separator group is disposed in each electrode unit. The electrolyte contacts the electrode units and the separator groups. It is characterized in that each separator group includes a first separator unit and a second separator unit. The first separator unit has a basis weight of 120 g / m 2 to 200 g / m 2 The second separator unit has a basis weight of 10 g / m 2 to 40 g / m 2 The ratio range of the basis weight of the first separator unit to the basis weight of the second separator unit is 3 to 20. The first separator unit contacts the anode plates of the respective electrode units, and the second separator unit is disposed adjacent to the first separator unit and contacts the cathode plates of the respective electrode units.

[0005] In the sealed valve-regulated lead-acid battery of the present invention, the first diaphragm unit of each diaphragm group has a first diaphragm that contacts and extends around two opposite sides of each anode plate.

[0006] In the sealed valve-regulated lead-acid battery of the present invention, the second diaphragm unit of each diaphragm group has a second diaphragm that is adjacent to and extends around the surface of the first diaphragm opposite to the anode plate.

[0007] In the sealed valve-regulated lead-acid battery of the present invention, the second diaphragm unit of each diaphragm group has two second diaphragms that are spaced apart, with each anode plate and the first diaphragm sandwiched between the second diaphragms, and one of the second diaphragms contacts the cathode plate of each electrode unit.

[0008] In the sealed valve-regulated lead-acid battery of the present invention, the first diaphragm unit of each diaphragm group has a first diaphragm that extends around two opposite sides of each cathode plate, and the first diaphragm is disposed adjacent to the surface of the second diaphragm unit opposite to the cathode plate.

[0009] In the sealed valve-regulated lead-acid battery of the present invention, the second diaphragm unit of each diaphragm group has a second diaphragm that is disposed adjacent to the first diaphragm and contacts and extends around two opposite sides of each cathode plate.

[0010] In the sealed valve-regulated lead-acid battery of the present invention, the second diaphragm unit of each diaphragm group has two second diaphragms that are spaced apart, and each cathode plate is sandwiched between and contacts the second diaphragms.

[0011] In the sealed valve-regulated lead-acid battery of the present invention, in each diaphragm group, the contact area of each second diaphragm with the first diaphragm is 1 / 4 to 1 times the area of the surface of the first diaphragm facing the second diaphragm.

[0012] In the sealed valve-regulated lead-acid battery of the present invention, in each diaphragm group, the first diaphragm unit includes a plurality of first fibers with an average diameter range of 2 μm to 40 μm, and the second diaphragm unit includes a plurality of second fibers with an average diameter range of 2 μm to 20 μm.

[0013] The second object of the present invention is to provide a sealed valve-regulated lead-acid battery that can prevent the generation of lead dendrites.

[0014] The sealed valve-regulated lead-acid battery of the present invention comprises an electrode unit, a separator group, and an electrolyte. The electrode unit includes a cathode plate and an anode plate disposed at an interval from the cathode plate. The separator group separates the cathode plate from the anode plate. The electrolyte is in contact with the electrode unit and the separator group. It is characterized in that the separator group includes a first separator unit and a second separator unit. The first separator unit has a basis weight of 120 g / m 2 to 200 g / m 2 and the second separator unit has a basis weight of 10 g / m 2 to 40 g / m 2 . The ratio range of the basis weight of the first separator unit to that of the second separator unit is 3 to 20. The first separator unit is in contact with the anode plate, and the second separator unit is disposed adjacent to the first separator unit and in contact with the cathode plate.

[0015] The beneficial effect of the present invention is that by using the first separator unit with a specific basis weight range in combination with the second separator unit with a specific basis weight range, controlling the ratio of the basis weight of the first separator unit to that of the second separator unit between 3 and 20, and disposing the first separator unit in contact with each anode plate and the second separator unit in contact with each cathode plate between the cathode plate and the anode plate, the electrolyte can easily diffuse quickly through the second separator unit, thereby avoiding the problem of lead dendrite formation caused by the accumulation of lead sulfate and resulting in short circuit. Description of the Drawings

[0016] Figure 1 is a cross-sectional schematic diagram showing the first embodiment of the sealed valve-regulated lead-acid battery of the present invention;

[0017] Figure 2 is a cross-sectional schematic diagram showing the second embodiment of the sealed valve-regulated lead-acid battery of the present invention;

[0018] Figure 3 is a three-dimensional schematic diagram showing the anode plate and the separator group in the second embodiment;

[0019] Figure 4 is a cross-sectional schematic diagram showing the third embodiment of the sealed valve-regulated lead-acid battery of the present invention;

[0020] Figure 5 is a cross-sectional schematic diagram showing a variation of the third embodiment;

[0021] Figure 6 is a front view schematic diagram showing the position of the second separator in the variation of the third embodiment;

[0022] Figure 7is a schematic sectional view showing a fourth embodiment of the sealed valve-regulated lead-acid battery of the present invention;

[0023] Figure 8 is a schematic sectional view showing a fifth embodiment of the sealed valve-regulated lead-acid battery of the present invention; and

[0024] Figure 9 is a schematic sectional view showing a comparative example of the sealed valve-regulated lead-acid battery of the present invention. Detailed Description of the Invention

[0025] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0026] Refer to Figure 1 , the first embodiment of the sealed valve-regulated lead-acid battery of the present invention includes: a housing 1, two electrode units 2, two separator groups 3, and an electrolyte (not shown in the figure) impregnated in the separator groups 3. Among them, the type of the electrolyte is sulfuric acid.

[0027] The electrode units 2 are arranged in the housing 1 at intervals. Each electrode unit 2 includes a cathode plate 21 and an anode plate 22 arranged at an interval from the cathode plate 21. The cathode plate 21 and the anode plate 22 are spaced apart from each other and arranged alternately. The number of electrode units 2 is not limited to two and can be adjusted flexibly according to actual needs. It can also be one or more than three.

[0028] Each cathode plate 21 has a conductive grid 211 and two active material layers 212 respectively arranged on two opposite sides of the conductive grid 211. The conductive grid 211 is, for example, a lead grid or a lead alloy grid, and the active material layer 212 includes lead.

[0029] Each anode plate 22 has a conductive grid 221 and two active material layers 222 respectively arranged on two opposite sides of the conductive grid 221. The conductive grid 221 is, for example, a lead grid or a lead alloy grid, and the active material layer 222 includes lead oxide.

[0030] The separator groups 3 separate the cathode plate 21 and the anode plate 22, and each separator group 3 is arranged in each electrode unit 2. The number of separator groups 3 is not limited to two and is adjusted flexibly corresponding to the number of electrode units 2. For example, but not limited to, when the number of electrode units 2 is one, the number of separator groups 3 is one; when the number of electrode units 2 is three, the number of separator groups 3 is three, and so on.

[0031] Each diaphragm group 3 includes a first diaphragm unit 31 and a second diaphragm unit 32 adjacent to the first diaphragm unit 31. The first diaphragm unit 31 contacts the anode plates 22 of each electrode unit 2, but does not contact any of the cathode plates 21 of the electrode unit 2. The second diaphragm unit 32 contacts the cathode plates 21 of each electrode unit 2, but does not contact any of the anode plates 22 of the electrode unit 2. In the first embodiment, the first diaphragm unit 31 has two first diaphragms 311, and the first diaphragms 311 respectively contact two opposite sides of each anode plate 22 to sandwich each anode plate 22. The second diaphragm unit 32 has two second diaphragms 321 respectively located on the surfaces of the first diaphragms 311 opposite to the anode plates 22 and adjacent to the first diaphragms 311. The second diaphragms 321 sandwich the first diaphragms 311 with each anode plate 22, and one of the second diaphragms 321 contacts the cathode plates 21 of each electrode unit 2.

[0032] The first diaphragm unit 31 includes a plurality of first fibers with an average diameter ranging from 2 μm to 40 μm. The material of the first fibers is cloth. In some embodiments of the present invention, the type of the first fibers is glass fiber. The manufacturing method of the first diaphragm unit 31 is, for example but not limited to, the papermaking method. In some embodiments of the present invention, the manufacturing method of the first diaphragm unit 31 is the papermaking method.

[0033] The second diaphragm unit 32 includes a plurality of second fibers with an average diameter ranging from 2 μm to 20 μm. The material of the second fibers is cloth. The type of the second fibers is, for example but not limited to, glass fiber or polymer fiber. The manufacturing method of the second diaphragm unit 32 is, for example but not limited to, the weaving method, the non-woven method, or the papermaking method.

[0034] The basis weight of the first diaphragm unit 31 ranges from 120 g / m 2 to 200 g / m 2 The basis weight of the second diaphragm unit 32 ranges from 10 g / m 2 to 40 g / m 2 wherein, the ratio range of the basis weight of the first diaphragm unit 31 to that of the second diaphragm unit 32 is from 3 to 20.

[0035] In the first embodiment, between each cathode plate 21 and each anode plate 22, the first diaphragm unit 31 contacting each anode plate 22 and the second diaphragm unit 32 contacting each cathode plate 21 are provided, and the basis weight of the first diaphragm unit 31 is controlled within 120 g / m 2 to 200 g / m 2During this period, the basis weight of the second separator unit 32 is controlled to be between 10 g / m 2 and 40 g / m 2 During this period, the ratio of the basis weight of the first separator unit 31 to that of the second separator unit 32 is controlled to be between 3 and 20, so that during the discharging process of the sealed valve-regulated lead-acid battery, the electrolyte impregnated in each separator group 3 can quickly diffuse through the second separator unit 32 to each cathode plate 21, without excessive lead sulfate forming and accumulating in each separator group 3, thereby avoiding the generation of lead dendrites during the charging process and preventing short circuit conditions from occurring.

[0036] Refer to Figure 2 and Figure 3 In the second embodiment of the sealed valve-regulated lead-acid battery of the present invention, which is different from the first embodiment: each first separator unit 31 of each separator group 3 has a first separator 311, and the first separator 311 contacts each anode plate 22, and extends from one side of each anode plate 22 through the bottom of each anode plate 22 to the other side opposite to the side, thus generally presenting a U-shape surrounding each anode plate 22. The second separator unit 32 has a second separator 321, and the second separator 321 is adjacent to the first separator 311, and extends from the first separator 311 on the side of each anode plate 22 through the bottom of the first separator 311 to the first separator 311 on the other side of each anode plate 22, thus generally presenting a U-shape surrounding the first separator 311.

[0037] Refer to Figures 4 to 6 In the third embodiment of the sealed valve-regulated lead-acid battery of the present invention, which is different from the first embodiment: in the third embodiment, each first separator unit 31 of each separator group 3 has a first separator 311, and the first separator 311 contacts each anode plate 22, and extends from one side of each anode plate 22 through the bottom of each anode plate 22 to the other side opposite to the side, thus generally presenting a U-shape surrounding each anode plate 22.

[0038] Wherein, the contact area of each second separator 321 with the first separator 311 is 1 / 4 times to 1 times the area of the surface of the first separator 311 facing the second separator 321. In one implementation manner of the third embodiment, as Figure 4 shown, the contact area of each second separator 321 with the first separator 311 is 1 time the area of the surface of the first separator 311 facing the second separator 321. In a variant of the third embodiment, as Figure 5 and Figure 6As shown, the contact area of each second separator 321 with the first separator 311 is smaller than the area of the surface of the first separator 311 facing the second separator 321, and each second separator 321 is disposed at the central position of the surface of the first separator 311 facing the second separator 321.

[0039] Refer to Figure 7 , the fourth embodiment of the sealed valve-regulated lead-acid battery of the present invention is different from the first embodiment in that: in the fourth embodiment, each first separator unit 31 of each separator group 3 has a first separator 311, and the first separator 311 extends from one side surface of each cathode plate 21 via the bottom of each cathode plate 21 to the other side surface opposite to the side surface, thus generally presenting a U-shape surrounding each cathode plate 21, and the first separator 311 is closely disposed on the surface of the second separator unit 32 opposite to the cathode plate 21. The second separator unit 32 has a second separator 321, and the second separator 321 is closely disposed adjacent to the first separator 311, and contacts each cathode plate 21 and extends from one side surface of each cathode plate 21 via the bottom of each cathode plate 21 to the other side surface opposite to the side surface, thus generally presenting a U-shape surrounding each cathode plate 21, that is to say, the surface of the second separator 321 opposite to the cathode plate 21 is surrounded by the adjacent first separator 311 in a generally U-shaped manner.

[0040] Refer to Figure 8 , the fifth embodiment of the sealed valve-regulated lead-acid battery of the present invention is different from the fourth embodiment in that: in the fifth embodiment, each second separator unit 32 of each separator group 3 has two second separators 321. The second separators 321 are respectively disposed on two opposite side surfaces of each cathode plate 21, contact each cathode plate 21, and are clamped between the first separator 311 and each cathode plate 21.

[0041] The present invention will be further described with reference to the following embodiments, but it should be understood that the embodiments are only for illustrative purposes and do not limit the present invention.

[0042] Embodiments 1 to 4 and Comparative Example 2

[0043] With reference to Figure 2 , the structures of the sealed valve-regulated lead-acid batteries of Embodiments 1 to 4 and Comparative Example 2 are as described in the second embodiment above, and the basis weights of each first separator unit 31, the types and basis weights of each second separator unit 32, and the basis weight ratios of each first separator unit 31 to each second separator unit 32 in the sealed valve-regulated lead-acid batteries of Embodiments 1 to 4 and Comparative Example 2 are shown in Table 1.

[0044] Comparative Example 1

[0045] The difference between the sealed valve-regulated lead-acid battery of Comparative Example 1 and that of Example 2 is that, referring to Figure 9 , in the sealed valve-regulated lead-acid battery of Comparative Example 1, each first separator unit 31 contacts each cathode plate 21, and each second separator unit 32 contacts each anode plate 22.

[0046] Table 1

[0047]

[0048] Referring to Table 1, in Examples 1 to 4, by arranging each first separator unit 31 and each second separator unit 32 at specific positions between the respective electrode units 2, and using the first separator units 31 with a basis weight range of 120 g / m 2 to 200 g / m 2 and the second separator units 32 with a basis weight range of 10 g / m 2 to 40 g / m 2 , and controlling the ratio of the basis weight of the first separator unit 31 to that of the second separator unit 32 in each separator group 3 to be between 3 and 20, the sealed valve-regulated lead-acid battery during discharge will not have excessive lead sulfate accumulation resulting in the formation of lead dendrites, proving that the sealed valve-regulated lead-acid batteries of Examples 1 to 4 can effectively inhibit the formation of lead dendrites.

[0049] In Comparative Example 1, each first separator unit 31 contacts each cathode plate 21, and each second separator unit 32 contacts each anode plate 22, resulting in the formation of lead dendrites in the sealed valve-regulated lead-acid battery. In Comparative Example 2, since the basis weight of each second separator unit 32 is not controlled between 10 g / m 2 and 40 g / m 2 , and the ratio of the basis weight of the first separator unit 31 to that of the second separator unit 32 in each separator group 3 is not controlled between 3 and 20, lead dendrites are formed in the sealed valve-regulated lead-acid battery.

[0050] In summary, the sealed valve-regulated lead-acid battery of the present invention, by making each first separator unit 31 in each separator group 3 contact each anode plate 22 and making the second separator unit 32 contact each cathode plate 21, and using the first separator units 31 with a basis weight range of 120 g / m 2 to 200 g / m 2 matched with the second separator units 32 with a basis weight range of 10 g / m 2 to 40 g / m 2of the second separator unit 32, and controlling the ratio of the basis weight of the first separator unit 31 to that of the second separator unit 32 to be between 3 and 20, whereby the electrolyte can easily and rapidly diffuse between the first separator unit 31 and the second separator unit 32. Furthermore, in the discharge process of the sealed valve-regulated lead-acid battery of the present invention, a short circuit will not occur due to excessive accumulation of lead sulfate resulting in the formation of lead dendrites. Therefore, the object of the present invention can indeed be achieved.

Claims

1. A sealed valve-regulated lead-acid battery, comprising: a plurality of electrode units, a plurality of separator groups, and an electrolyte. Each electrode unit includes a cathode plate and an anode plate disposed at an interval from the cathode plate. The separator groups separate the cathode plate from the anode plate and each separator group is disposed in each electrode unit. The electrolyte is in contact with the electrode units and the separator groups, characterized in that, Each diaphragm group includes a first diaphragm unit and a second diaphragm unit. The first diaphragm unit has a basis weight of 120 g / m 2 to 200 g / m 2 and the second diaphragm unit has a basis weight of 10 g / m 2 to 40 g / m 2 and the ratio of the basis weight of the first diaphragm unit to that of the second diaphragm unit ranges from 3 to 20. The first diaphragm unit contacts the anode plate of each electrode unit, and the second diaphragm unit is disposed adjacent to the first diaphragm unit and contacts the cathode plate of each electrode unit.

2. The sealed valve-regulated lead-acid battery according to claim 1, wherein, The first diaphragm unit of each diaphragm group has a first diaphragm that contacts and extends around two opposite sides of the anode plate of each electrode unit.

3. The sealed valve-regulated lead-acid battery according to claim 2, characterized in that, The second diaphragm unit of each diaphragm group has a second diaphragm that is adjacent to and extends around the surface of the first diaphragm opposite to the anode plate.

4. The sealed valve-regulated lead-acid battery according to claim 2, characterized in that, The second diaphragm unit of each diaphragm group has two second diaphragms arranged at intervals, with the anode plate of each electrode unit and the first diaphragm sandwiched between the second diaphragms, and one of the second diaphragms contacts the cathode plate of each electrode unit.

5. The sealed valve-regulated lead-acid battery according to claim 1, characterized in that, The first diaphragm unit of each diaphragm group has a first diaphragm that extends around two opposite sides of the cathode plate of each electrode unit, and the first diaphragm is disposed adjacent to the surface of the second diaphragm unit opposite to the cathode plate.

6. The sealed valve-regulated lead-acid battery according to claim 5, characterized in that, The second diaphragm unit of each diaphragm group has a second diaphragm that is disposed adjacent to the first diaphragm and contacts and extends around two opposite sides of the cathode plate of each electrode unit.

7. The sealed valve-regulated lead-acid battery according to claim 5, characterized in that, The second diaphragm unit of each diaphragm group has two second diaphragms arranged at intervals, and the cathode plate of each electrode unit is sandwiched between and contacts the second diaphragms.

8. The sealed valve-regulated lead-acid battery according to claim 4 or 7, characterized in that, In each diaphragm group, the contact area of each second diaphragm with the first diaphragm is 1 / 4 to 1 times the area of the surface of the first diaphragm facing the second diaphragm.

9. The sealed valve-regulated lead-acid battery according to claim 1, characterized in that, In each diaphragm group, the first diaphragm unit includes a plurality of first fibers with an average diameter range of 2 μm to 40 μm, and the second diaphragm unit includes a plurality of second fibers with an average diameter range of 2 μm to 20 μm.

10. A sealed valve-regulated lead-acid battery, comprising: an electrode unit, a separator group, and an electrolyte, wherein the electrode unit includes a cathode plate and an anode plate disposed at an interval from the cathode plate, the separator group separates the cathode plate from the anode plate, and the electrolyte is in contact with the electrode unit and the separator group, characterized in that, The diaphragm group includes a first diaphragm unit and a second diaphragm unit. The first diaphragm unit has a basis weight of 120 g / m 2 to 200 g / m 2 and the second diaphragm unit has a basis weight of 10 g / m 2 to 40 g / m 2 . The ratio range of the basis weight of the first diaphragm unit to that of the second diaphragm unit is 3 to 20. The first diaphragm unit is in contact with the anode plate, and the second diaphragm unit is disposed adjacent to the first diaphragm unit and in contact with the cathode plate.

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