JPH08124547A - Alkaline storage battery - Google Patents

Abstract

PURPOSE: To provide an alkaline storage battery of low internal resistance and high discharge voltage suitable for the discharge of a large amount of current by providing a connecting conductor having the capability of concurrently reducing types of resistance due to a connection plate and a terminal plate. CONSTITUTION: This alkaline storage battery has a plate group formed out a positive electrode plate and a negative electrode plate spirally wound via a separator, and the projection of the positive or negative electrode plate is formed at least on one end of the plate group. Also, the battery has a connecting conductor formed out of terminal plates 1 welded to the projections at a plurality of positions and connection plates 2 and 3 extended from the plates 1 as integral part thereof. In addition, the conductor has connection plates extended from the plates 1 along 'n' directions ('n': integer equal to 3 or more).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a current collecting means for a battery provided with a spiral electrode, and more particularly to a cylindrical sealed alkaline storage battery used for high current discharge.

[0002]

2. Description of the Related Art Generally, a connecting conductor of a cylindrical sealed alkaline storage battery includes a terminal plate for collecting a spiral electrode plate group wound via a separator, and a battery cover which is a positive electrode terminal. Alternatively, the purpose is to connect to the bottom surface of the metal case that is the negative electrode terminal, and it is composed of a connection plate that is integral with the terminal plate and extends from the terminal plate.

Conventionally, since the number of connecting plates extending from the terminal plate is one or two, a large voltage drop occurs due to the electric resistance of this portion especially when discharging a large current. Further, when the number of connecting plates is small, the current collected at a place far from the connecting plate base (near the connecting plate from the terminal plate) causes a large voltage drop before reaching the connecting plate base.

As a means for reducing the resistance due to the connecting plate, a means for increasing its width or thickness can be considered. However, if the width is made too wide, there is a limit in the case of the connecting conductor of the positive electrode, which may accidentally contact the inner wall of the battery case that also serves as the negative electrode and cause a short circuit. on the other hand,
As a technique for increasing the thickness, in the specification of European Patent 0545906A2, by using a connecting conductor in which the thickness of the connecting plate is thicker than that of the terminal plate, the terminal plate is firmly welded to the edge of the electrode plate group. A method of reducing the resistance based on the connecting plate while allowing to do so is described. However, in this case, since there is only one connecting plate, the current collected at a location far from the base portion causes a large voltage drop by the time it reaches the base portion. Further, in order to obtain the connecting conductors having different thicknesses, the manufacturing process becomes complicated and the manufacturing cost becomes high.

The present invention has been made in view of the above points, and proposes a connecting conductor capable of simultaneously reducing the resistance due to the connecting plate and the terminal plate, whereby the internal resistance is small and the discharge An alkaline storage battery having a high voltage and suitable for large-current discharge is provided.

[0006]

By using a connecting conductor having a connecting plate extending from the terminal plate in the direction of n which is three or more, the resistance due to the terminal plate is reduced, and the connecting plate is n It is integrated in a smaller number and is bent and welded so as to be stacked on top of each other, thereby reducing the resistance due to the connecting plate.

[0007]

Since the number of connecting plates extending from the terminal plate of the connecting conductor is three or more, the current flowing into the base of the connecting plate and the connecting plate is collected as compared with the conventional case of one or two connecting plates. Since the average distance to the portion to be formed is small, the voltage drop that occurs on the terminal board can be reduced and the current distribution is uniform. Further, since the width of each connecting plate is the same as the conventional one, it is possible to prevent the connecting plate from accidentally coming into contact with the inner wall of the battery case to cause a short circuit. Further, since the connecting plate has a bent portion or a branched portion, even if the number is three or more, it is bent between the terminal plate and the bent portion or the branched portion, and the bent portion or the branched portion is It can be stacked and welded to any other connecting plate between itself and the tip of the connecting plate. As a result, unlike the case of using a connection conductor having a connection plate thicker than the terminal plate, the resistance due to the connection plate can be reduced without complicating the manufacturing process thereof and at low cost.

[0008]

The preferred embodiments of the present invention will be described below in detail with reference to the drawings and comparison with comparative examples. Example 1 FIG. 1 is a plan view of a connecting conductor (a) used in an alkaline storage battery according to an example of the present invention. this is,
It is composed of a terminal plate 1 and connecting plates 2 and 3 extending in four different directions on the same plane, and the connecting plate 3 has a bent portion 4. The center of the terminal board 1 and the connection board 3 are provided with perforations 5 and 5 ', respectively.

FIG. 2 is a view in which the connection plate 3 is bent between the terminal plate and the bent portion before the connection conductor shown in FIG. 1 is welded to the electrode plate group, and the connection plate 3 is orthogonal to it. It is bent so as to form a stacking part 6 and a connecting plate 2 extending in the direction. At this time, the perforations 5 ′ of the connection plate 3 are
It completely overlaps with the perforations 5 of the terminal board 1.

FIG. 3 shows that the connection conductor in the state shown in FIG. 2 is made of a sintered nickel positive electrode plate and a paste type negative electrode plate made of a hydrogen storage alloy represented by the composition formula MmNi _3.55 Mn _0.4 Al _0.3 Co _0.75 made of polyamide. FIG. 4 is a side cross-sectional view of the electrode plate group, which is wound in a spiral shape via a nonwoven fabric, after being welded to the projecting portion at the upper edge of the electrode plate group and then housed in a battery case. After injecting a 30 wt% KOH aqueous solution as an electrolytic solution through the perforations 5, the connecting plate stacking portion 6 was welded to the facing connecting plate 2. FIG. 4 is a cross-sectional view of the side surface when the battery lid and the connection plate of the current collector are welded. A current collecting means having the same structure is also welded and placed on the projecting portion at the lower edge of the electrode plate group, and the battery lid and the metal case are caulked and sealed to obtain a nominal capacity of 16 Ah, K.
A sealed nickel-hydrogen battery A having a size of RM was manufactured. [Example 2] Instead of the connection conductor (a) of the battery A of Example 1, the connection conductor shown in FIG. 5 has a connection plate extending from the terminal plate in four directions, two of which branch in two directions. A battery B was made in the same manner as the battery A except that (b) was used. [Example 3] The connection conductor (c) shown in FIG. 6 having a connection plate extending in three directions from the terminal plate, two of which are bent, instead of the connection conductor (a) of the battery A of Example 1. A battery C was prepared in the same manner as the battery A except that was used. [Example 4] The connection conductor shown in FIG. 7 having a connection plate in which the periphery of the perforated portion of the connection plate is wider than the other parts of the connection plate, instead of the connection conductor (a) of the battery A of Example 1. A battery D was made in the same manner as the battery A except that (d) was used. [Comparative Example 1] Similar to Battery A except that a conventional connecting conductor (e) shown in FIG. 8 having two connecting plates was used in place of the connecting conductor (a) of Battery A of Example 1. Then, a battery E was manufactured. [Comparative Example 2] In place of the connecting conductor (a) of the battery A of Example 1, two connecting plates were provided, one of which was 2 '.
Has three times the thickness of the terminal board and the other connection board 2,
A battery F was produced in the same manner as the battery A except that the connection conductor (f) shown in FIG. 9 was used.

After forming the batteries A to F thus produced, charging and discharging were performed for several cycles, and then the internal resistance was measured by the direct current method. Table 1 shows the results.

[0012]

[Table 1] In all the batteries except the battery E, the internal resistance was remarkably improved by the improvement of the connecting plate of the connecting conductor.

Next, FIG. 10 shows discharge characteristics when the battery is charged with a current of 0.2 CA for 6 hours and then discharged with a current of 1 CA. All batteries except the battery E have a high discharge voltage because the internal resistance is reduced. However, in the battery F, since the number of connecting plates of the connecting conductors is two, the average distance between the base of the connecting plate and the part where the current flowing into the connecting plate is collected is large, and therefore the battery F on the terminal plate is large. The voltage drop that occurs in the battery is large, and the discharge voltage is lower than the batteries A and B in particular.

Further, comparing the batteries A and D, the battery D has a smaller electric resistance because the vicinity of the perforations of the connection plate is wider, and the effect is slightly shown in Table 1 and FIG.

As described above, the batteries A, B, C of the present invention,
It can be seen that the performance of D is significantly improved at the time of discharging a large current as compared with the battery E using the conventional connection conductor.
Further, the battery of the present invention has an increased discharge capacity, which means that with the improvement of the connecting conductor, the current distribution becomes uniform,
It is considered that this is because the utilization rate of the active material is improved.

Further, when the connecting plate is perforated when the connecting plate is bent, the strength of the perforated portion becomes weaker than the other portions of the connecting plate, so that the position of the perforated portion is easily bent. However, as shown in FIGS. 1, 5 and 6, by making the base portion of the connection plate of the connection conductor narrower than the main part of the connection plate, it becomes easy to fold it at a desired position. It was possible to significantly reduce process defects. In these drawings, two small holes are provided at two locations in order to narrow the base portion of the connection plate, but the invention is not limited to this as long as the width can be made narrow, and slits such as slanting can be formed. It was confirmed that the same effect can be obtained by using the above method.

In the embodiment, the connecting plate extends from the terminal plate in three or four directions. However, even if the connecting plate extends in five or more directions, the connecting plate is bent or branched to bend and stack the plates. It is possible to stack,
The same effect as the embodiment can be obtained. In addition, if the connecting plates extending in different n directions are bent and integrated into a number smaller than n (for example, the connecting plates extending in 4 directions are bent and put together into two, etc.), the connecting plates can be used in any case. It was confirmed that the voltage drop due to However, the effect obtained when they are integrated into one as in the example is most remarkable.

Although the sealed nickel-hydrogen battery is illustrated as an example, the present invention is not limited to this, and the present invention can be applied to any battery using a spiral electrode.

[0019]

As described above, according to the present invention, the resistance due to the terminal plate can be reduced by using the connecting conductor provided with the connecting plate extending in the direction of n which is three or more from the terminal plate. it can. In addition, by integrating the connecting plates in a number smaller than n, bending and welding so as to be stacked on each other, a thick connecting plate can be formed at low cost without complicating the manufacturing process of the connecting conductor. The resistance due to the connecting plate can be reduced as in the case of using it. As a result, it is possible to provide a sealed cylindrical alkaline battery having a low internal resistance and a high discharge voltage, which is suitable for large-current discharge.

[Brief description of drawings]

FIG. 1 is a plan view of a connection conductor (a) according to the present invention including a connection plate with a bent portion.

FIG. 2 is a diagram in which a bent connection plate of the connection conductor (a) according to the present invention is bent inward.

FIG. 3 is a sectional view of a side surface when the connection conductor (a) according to the present invention is welded to an electrode plate group and housed in a metal case.

FIG. 4 is a sectional view of a side surface when a battery lid is welded to a connection plate of a connection conductor (a) according to the present invention.

FIG. 5 is a plan view of a connection conductor (b) according to the present invention including a connection plate with branch portions.

FIG. 6 is a plan view of a connection conductor (c) according to the present invention including a connection plate with a bent portion.

FIG. 7 is a plan view of a connecting conductor (d) according to the present invention including a connecting plate with a bent portion.

FIG. 8 is a plan view of a connection conductor (e) used as a comparative example.

FIG. 9 is a plan view of a connection conductor (f) used as a comparative example.

FIG. 10 is a diagram showing a large current discharge characteristic of each battery.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Terminal plate 2 Connection plate 3 Connection plate having a bent portion 4 Bent or branched portion 5 Perforation 5'Perforation provided in the connection plate 6 Connection plate stacking portion 7 Battery lid 8 Battery case

Claims (12)

[Claims] 1. A positive electrode plate and a negative electrode plate are provided with an electrode plate group that is spirally wound with a separator interposed therebetween, and at least one end face of the electrode plate group has a projection of an edge of the positive electrode plate or the negative electrode plate. A terminal plate that is welded to a plurality of portions of the projecting portion, and a connecting plate that is integral with the terminal plate and extends from the terminal plate. An alkaline storage battery having a connection plate extending in the n direction. However, in the above, n is an integer of 3 or more. 2. The alkaline storage battery according to claim 1, wherein the connecting plates are bent and welded so as to be stacked on each other and are integrated in a number smaller than n. 3. At least one connecting plate has a bent portion extending from the terminal plate and bent in another direction, and is bent between the terminal plate and the bent portion, and the bent portion and the connection are formed. 3. The connection plate is integrated with any other connection plate between the tip of the plate and the other connection plate, and is stacked on each other.
Alkaline storage battery described in. 4. The at least one connecting plate has a branch portion that extends from the terminal plate and branches in at least two directions. The branch portion is bent between the terminal plate and the branch portion, and the branch portion and the connection are formed. The alkaline storage battery according to claim 1 or 2, wherein the alkaline storage battery is integrated with any of the other connection plates between the tip of the plate and the connection plates and is stacked on each other. 5. The method according to claim 1, wherein at least one of the connection plates bent so as to pass through the winding shaft of the electrode plate group has a hole at the position of the winding shaft. Two
The alkaline storage battery according to claim 3 or 4. 6. The alkaline storage battery according to claim 5, wherein the connection plate having perforations is wider than other portions of the connection plate near the perforations. 7. The alkaline storage battery according to claim 5, wherein the connection plate having the perforations has a portion at a base portion thereof which is narrower than a main portion of the connection plate. 8. A connecting conductor used in a battery, which comprises a positive electrode plate and a negative electrode plate spirally wound with a separator interposed between the positive electrode plate and the negative electrode plate, the connecting conductor being used in at least one of the electrode plate groups. A terminal plate portion that is welded to a plurality of portions of the protruding portion of the end edge of the positive electrode plate or the negative electrode plate that protrudes to the end surface, and a connection plate that is integrally formed with the terminal plate portion and is electrically connected to the battery terminal portion. And a connecting plate part extending from at least the terminal plate part in at least three directions or more. 9. A connection conductor used in a battery, comprising a positive electrode plate and a negative electrode plate, which are spirally wound with a separator interposed between the positive electrode plate and the negative electrode plate, the connecting conductor being used in at least one of the electrode plate groups. A terminal plate portion that is welded to a plurality of portions of the protruding portion of the end edge of the positive electrode plate or the negative electrode plate that protrudes to the end surface, and a connection plate that is integrally formed with the terminal plate portion and is electrically connected to the battery terminal portion. The connecting plate portion extends from at least the terminal plate portion in at least three directions, and at least one connecting plate portion has a bent portion that bends in different directions on the same plane. It is a plate portion, and by bending the connecting plate with a bent portion in the vicinity of its base portion, a portion of the connecting plate with a bent portion that is ahead of the bent portion can be overlapped with another connecting plate portion. A connecting conductor for a battery, which is characterized in that 10. A connection conductor used in a battery, comprising a positive electrode plate and a negative electrode plate, which are spirally wound with a separator in between, and which is used in a battery, wherein at least one of the electrode plate groups is used. A terminal plate portion that is welded to a plurality of portions of the protruding portion of the end edge of the positive electrode plate or the negative electrode plate that protrudes to the end surface, and a connection plate that is integrally formed with the terminal plate portion and is electrically connected to the battery terminal portion. The connection plate portion extends from at least the terminal plate portion in at least three directions, and at least one connection plate portion has a branch portion having a branch portion that branches in two directions on the same plane. It is a plate part, and is configured such that the connection plate with a branch part is bent near its base part so that the part of the connection plate with a branch part that is ahead of the branch part can overlap with another connection plate part. Connection conductor for batteries characterized by . 11. The battery connecting conductor according to claim 9, wherein the bent portion of the connecting plate portion is narrower in width than other portions of the connecting plate portion. 12. A battery comprising the battery connecting conductor according to claim 8, claim 9, claim 10 or claim 11.