JPS63241856A - Intra-cell connection structure of storage battery - Google Patents

Abstract

PURPOSE:To make a substantial connection spot not to be hidden inside a through hole for enhancing reliability by connecting the conductive part of electrode plate arranged on each cell to each other with an intra-cell connection member pressed into the through hole. CONSTITUTION:A throughhole 2 is formed in a partition 4 dividing cells and an intra-cell connection member 3 is pressed into this throughhole 2. The throughhole 2 is positioned adjacent to the conductive parts 1, 1 of an electrode arranged inside each cell. And both ends of the member 3 are heated and melted respectively to be connected to the conductive parts 1 and 1. In this constitution, a substantial connection spot is not hidden inside the throughhole so as to have high reliability. Further, as the intra-cell connection member is pressed into the throughhole, intra-partition airtightness can be secured without providing any special structure.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Field of Application) The present invention relates to a connection structure between cells of a storage battery, and in particular, a structure that does not require extra material for connection between cells and has good conductivity. This invention relates to an excellent and highly reliable inter-cell connection structure.

(Prior Art) Conventionally, a through-the-vertation method has been adopted as an inter-cell connection structure of this type of storage battery in order to prevent a voltage drop from occurring in the connection between cells.

For the through-the-partition method, Japanese Patent Application Laid-Open No. 55-2829
The resistance welding method described in No. 5, and the
A method using crimping described in No. 27184 is known.

In resistance welding, as shown in FIG. 4, a through hole 2 is provided in a partition wall 4 that partitions cells, and a joint 8 is formed in a conductive portion 1 of an electrode disposed in each cell. Make them face each other in between. Then, the joining portion 8 is heated and melted by the heating electrode 10, and the inter-joining portion 8 is joined within the through hole 2.

On the other hand, in the case of caulking, as shown in FIG.
, 9b are opposed to each other with the through hole 2 in between. joint part 9a,
9b has an uneven shape and fits inside the through hole 2. After this fitting, the joint parts 9a and 9b are joined together by mechanical caulking.

However, in resistance welding, the shape of the joint formed by heating is not constant. For this reason, the joint part 8 is formed larger than the through hole 2, and after joining, the joint part 8 comes into pressure contact with the partition wall 4, thereby blocking communication between both cells via the through hole 2.

That is, the joint portion 8 was provided with a contact surface portion 7 that does not participate in joining but contacts the partition wall 4 to ensure airtightness.

However, when heating the joint part 8, a large current flows, so that the joint part 8 becomes warm and has an adverse effect on the partition wall 4. As a result, there is a problem in that airtightness is lacking between the partition wall 4 and the joint portion 8 even if the contact surface portion 7 is provided.

Furthermore, it was difficult to appropriately set the heating conditions in accordance with the variations in the bonded portions 8, and it was not possible to stably obtain a good bonded state. Furthermore, since the actual joint location is located within the through hole 2, there is also a reliability problem in that the state of the joint cannot be confirmed.

Even in the case of caulking, the joints 9a and 9b are formed larger than the through-hole 2 in order to prevent the caulking load from acting intensively on the partition wall and to ensure airtightness as in the case of resistance welding. A contact surface portion 7 was provided.

However, with this caulking method, the joint parts 9a, 9b protrude toward the partition wall 4, so when the electrode 1 is inserted into the cell, the joint parts 9a, 9b and the partition wall 4 interfere with each other. There is a risk that the joint portions 9a and 9b may be damaged. For this reason, there was a problem in that the workability of assembly was extremely poor.

Further, the joint portions 9a and 9b are provided with a contact surface portion 7 which is unnecessary for connection between cells, and are large in size. This contact surface portion 7 is interposed between the actual joint location and the conductive portion 1 and increases the coupling distance between the two. Therefore, it is a major cause of voltage drop. , 9b becomes large, which causes an increase in material costs.This also applies to resistance welding.

Therefore, in view of the above-mentioned problems of the prior art, the present invention provides a method of arranging an inter-cell connection member airtightly in advance with the through-hole formed in the partition wall to form an inter-cell connection independently of the partition wall.
This is a technical issue.

[Structure of the invention]

(Means for solving the problem) In order to solve this problem, the technical measures taken in the present invention are as follows:
The inter-cell connection structure of a storage battery is constructed by forming a through hole in a partition wall that partitions adjacent cells of the storage battery, and connecting both ends of an inter-cell joining member press-fitted into the through hole to be arranged in each cell. The reason is that it is connected to the conductive part of the electrode plate.

(Function) As described above, in the present invention, the conductive portions of the electrode plates disposed in each cell are joined by the inter-cell joining member press-fitted into the through hole. Therefore, the actual joint portion is not hidden within the through hole, resulting in high reliability.

Moreover, since it is press-fitted into the through hole, airtightness between the partition walls can also be ensured.

Moreover, since it has nothing to do with ensuring the airtightness of the through-hole, it is sufficient to simply deform both ends of the inter-cell joining member and join them. Therefore, the joining member and the conductive part are directly connected and are brought as close as possible to each other.

Therefore, the voltage drop of the storage battery can be reduced. Further, less material is required for the joining member.

(Embodiment) A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, a through hole 2 is formed in a partition wall 4 that partitions cells, and an intercell connecting member 3 is provided in the through hole 2.
is press-fitted. The through hole 2 is located adjacent to the conductive parts 1, 1 of the electrodes arranged in each cell. Both ends of the inter-cell connecting member 3 are heated and melted, respectively, and joined to the conductive portion 1.1.

Next, the assembly procedure of this embodiment will be explained.

First, the through hole 2 is formed in advance at a predetermined position in the partition wall 4 . Then, separately prepared electrodes are inserted into each cell. Then, the inter-cell joining member 3 is press-fitted into the through hole 2 (FIG. 1). This press-fitting blocks communication between the through hole 2 and the inter-cell connecting member 3, that is, the communication between the cells.

Furthermore, as shown in FIG. 2, heating electrodes 6, 6 are arranged at both ends of the inter-cell connecting member 3, and the heating electrodes 6 are connected to a power source E. As a result, both ends of the inter-cell connection member 3 are melted and the conductive portion 1.1 is melted.
to be joined to.

Since the inter-cell joining member 3 is press-fitted into the through-hole 2, a special airtight structure is not required for the inter-cell joining member 3.

Therefore, the inter-cell bonding member 3 and the conductive portion 1.1 are coupled over an extremely short distance. Therefore, voltage drop due to inter-cell junctions can be reduced.

In addition, the bonding heat is transferred from the outer periphery of the inter-cell connection member 3 to the through hole 2.
, and this edge also dissolves to some extent. As a result, the edge of the through hole 2 comes into close contact with the outer periphery of the inter-cell bonding member 3, and the airtightness of the through hole 2 is improved. As a result, the length of the inter-cell joint member 3 and the thickness of the partition wall 4 can be made thinner than when simply press-fitting, without changing the processing method (because the airtightness is improved). , the junction distance between the conductive parts 1.degree. 1 is further shortened, and the voltage drop at the inter-cell junction can be further reduced.

In addition, even if both ends of the inter-cell joining member 3 are caulked, the diameter of the inter-cell joining member 3 increases and is crimped to the edge of the through-hole 2, thereby improving the airtightness of the through-hole 2. Alternatively, a permeable adhesive may be applied between the through-hole 2 and the inter-cell bonding member 3 to ensure airtightness. Note that the adhesive may be used in combination with heating and melting or caulking.

[Structure of the invention]

As described in detail above, in the present invention, the conductive parts of the electrode plates arranged in each cell are joined by the inter-cell joining member press-fitted into the through hole. Therefore, the actual joint will not be hidden inside the through hole (high reliability).In addition, since it is press-fitted into the through hole, airtightness between the partition walls can be ensured without the need for a special structure. .

Moreover, since it is not concerned with ensuring the airtightness of the through-hole, it is sufficient to simply deform and join both ends of the inter-cell joining member. Therefore, the joining member and the conductive part are directly connected and are brought as close as possible to each other. Therefore, the voltage drop at the connection between cells of the storage battery can be reduced. Another advantage is that less material is required for the joining member.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIGS. 2 and 3 are a perspective view and a sectional view showing the assembly procedure of the embodiment. FIGS. 4 and 5 are sectional views showing conventional devices, respectively. ! ...Conductive part. 2...Through hole. 3... Inter-cell joining member. 4... Bulkhead. 5... Joint location. 6... Heating electrode. 7...Abutment surface part. 8.9a, 9b...joint parts. E...Power supply.

Claims (4)

[Claims] (1) A through-hole is formed in the partition wall that partitions adjacent cells of the storage battery, and both ends of the inter-cell joining member press-fitted into the through-hole are
A storage battery cell-to-cell connection structure in which the conductive parts of the electrode plates arranged in each cell are joined. (2) The cell-to-cell connection structure of a storage battery according to claim 1, wherein the cell-to-cell bonding member is press-fitted into the through-hole and then caulked, so that the cell-to-cell bonding member is brought into close contact with the through-hole. (3) After the inter-cell joining member is press-fitted into the through-hole, the inter-cell joining member is electrically heated to heat and melt the partition wall through the inter-cell joining member, so that the inter-cell joining member is closely attached to the through-hole. An intercell connection structure for a storage battery according to claim 1. (4) The storage battery according to claim 1, wherein after the inter-cell joining member is press-fitted into the through-hole, a permeable adhesive is applied between the inter-cell joining member and the through-hole. intercell connection structure.