JP7094087B2 - Battery device - Google Patents

Description

The present invention relates to a battery device.

For example, as shown in Patent Document 1, a battery device mounted on a vehicle includes a plurality of battery cells and a circuit board on which a voltage detection circuit or the like for detecting the voltage of the battery cells is formed. Conventionally, a plurality of battery cells and a circuit board are fixed by soldering or screwing.

Japanese Unexamined Patent Publication No. 2010-56035

However, at present, in order to realize the battery capacity required for a vehicle, it is necessary to mount a large number of battery cells. Therefore, when all the battery cells and the circuit board are connected by soldering or screwing, the assembly work of the battery device becomes complicated.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to simplify the assembly work in a battery device including a plurality of battery cells and a circuit board connected to these battery cells. ..

The present invention adopts the following configuration as a means for solving the above problems.

The first invention is a battery device including a plurality of battery cells, a circuit board electrically connected to the battery cells, and a connection terminal for connecting the battery cells and the circuit board. The terminal adopts a configuration having a press-fitting portion to be press-fitted and fixed to the circuit board.

In the second invention, in the first invention, the connection terminal is provided at a base portion whose root portion is fixed to the battery cell and an intermediate portion of the base portion, and the tip portion of the base portion is provided. A configuration is adopted in which a flexible portion that can be displaced with respect to the root portion, a shaft portion that is erected at the tip portion of the base portion, and a press-fitting portion that is provided in the middle portion of the shaft portion.

In the third aspect of the invention, in the second invention, the flexible portion is shaped like a bridge protruding from the base portion toward the circuit board, and is viewed from a direction along the shaft portion. A configuration is adopted in which the flexible portion is arranged at a position avoiding the circuit board.

The fourth invention adopts the configuration in which the base portion and the flexible portion, and the shaft portion and the press-fitting portion are formed of different metal materials in the second or third invention.

In the fifth aspect of the invention, in any of the second to fourth inventions, the press-fitting portion bulges outward from the shaft portion in the radial direction and is directed toward the outer wall surface along the shaft portion. A configuration having a flat surface parallel to the surface is adopted.

According to the present invention, the connection terminal connecting the battery cell and the circuit board has a press-fitting portion to be press-fitted and fixed to the circuit board. Therefore, the battery cell and the circuit board can be electrically connected without soldering or screwing the connection terminal and the circuit board. Therefore, according to the present invention, it is not necessary to perform soldering or screwing work in order to electrically connect the battery cell and the circuit board. Therefore, according to the present invention, it is possible to simplify the assembly work in a battery device including a plurality of battery cells and a circuit board connected to these battery cells.

It is an exploded perspective view which shows the schematic structure of the battery apparatus in 1st Embodiment of this invention. It is an enlarged sectional view including the connection terminal provided in the battery apparatus in 1st Embodiment of this invention. It is an exploded sectional view of the connection terminal provided in the battery apparatus in 1st Embodiment of this invention. FIG. 3 is an enlarged cross-sectional view of a pin portion of a connection terminal included in the battery device according to the second embodiment of the present invention.

Hereinafter, an embodiment of the battery device according to the present invention will be described with reference to the drawings. In the following drawings, the scale of each member is appropriately changed in order to make each member recognizable.

(First Embodiment)
FIG. 1 is an exploded perspective view showing a schematic configuration of the battery device 1 of the first embodiment. The battery device 1 of the present embodiment is mounted on a vehicle and supplies electric power to a motor or the like under the control of an ECU (Engine Control Unit). As shown in FIG. 1, a cell unit 10 and a circuit are used. It includes a substrate 20.

The cell unit 10 includes a plurality of battery cells 2 and a plurality of connection terminals 3. Note that FIG. 1 shows a configuration in which the cell unit 10 has four battery cells 2. However, FIG. 1 is a simplified drawing for illustration purposes. Therefore, the actual cell unit 10 includes a larger number of battery cells 2.

The battery cell 2 is a secondary battery capable of storing electric power generated by a generator (not shown), and is composed of, for example, a nickel hydrogen storage battery or a lithium ion battery. As shown in FIG. 1, the battery cell 2 has a flat and substantially rectangular parallelepiped shape, and is arranged facing the adjacent battery cells 2 with a certain gap between the front and back surfaces. That is, in the cell unit 10, a plurality of battery cells 2 are arranged so as to face each other with a certain gap between the front and back surfaces.

The installation posture of the battery device 1 of the present embodiment is not particularly limited. However, in the following description, for convenience of explanation, as shown in FIG. 1, the side on which the connection terminal 3 is arranged with respect to the battery cell 2 is the upper side, and the opposite side thereof is the lower side. Further, the longitudinal direction of the battery cell 2 orthogonal to the vertical direction is defined as the left-right direction, and the lateral direction of the battery cell 2 orthogonal to the vertical direction is defined as the front-rear direction. That is, in the battery device 1 of the present embodiment, a plurality of battery cells 2 are arranged in the front-rear direction.

Two output terminals 2a are provided on the upper surface of each battery cell 2. The connection terminal 3 is provided for each output terminal 2a. That is, in the present embodiment, since the four battery cells 2 are provided and there are a total of eight output terminals 2a, a total of eight connection terminals 3 are provided. FIG. 2 is a cross-sectional view showing a schematic configuration of one connection terminal 3. As shown in this figure, the connection terminal 3 has a bar portion 3a and a pin portion 3b.

The bar portion 3a is a substantially band-shaped portion extending in the left-right direction, and has a base portion 3a1 and a flexible portion 3a2. The base portion 3a1 is a portion formed as a flat plate with the front and back surfaces oriented in the vertical direction along the upper surface of the battery cell 2, and extends substantially linearly in the left-right direction. The base portion 3a1 has a connection hole 3a3 on the root side into which the output terminal 2a of the battery cell 2 is inserted. The base portion 3a1 is connected to the battery cell 2 by welding or the like with the output terminal 2a inserted into the connection hole 3a3. The base portion 3a1 is fixed to the battery cell 2 only at the root portion where the connection hole 3a3 is formed. That is, in the base portion 3a1, the lower surface of the tip portion provided with the pin portion 3b is in contact with the upper surface of the battery cell 2 in FIG. 2, but the tip portion is not fixed to the upper surface of the battery cell 2.

The flexible portion 3a2 is arranged at a substantially central portion in the left-right direction of the base portion 3a1. That is, the flexible portion 3a2 is provided in the middle portion of the base portion 3a1. As shown in FIGS. 1 and 2, the flexible portion 3a2 is a portion shaped like a bridge in which the central portion is curved so as to project upward and is elastically deformable, and is a base portion. The tip of 3a1 can be displaced with respect to the root. The flexible portion 3a2 is connected to the root portion of the base portion 3a1 located on one side in the left-right direction and the tip portion of the base portion 3a1 located on the other side in the left-right direction, and the central portion protrudes upward. It has a curved shape. Therefore, the flexible portion 3a2 has a shape in which the tip portion of the base portion 3a1 can be easily moved in the left-right direction with respect to the root portion. However, the flexible portion 3a2 can also displace the tip portion of the base portion 3a1 in the front-rear direction with respect to the root portion.

Further, the flexible portion 3a2 is arranged at a position avoiding the circuit board 20 when viewed from above (direction along the shaft portion 3b1 described later). That is, in the present embodiment, the flexible portion 3a2 of the connection terminal 3 is arranged outside the edge of the circuit board 20 when viewed from above.

The bar portion 3a having such a base portion 3a1 and a flexible portion 3a2 secures an elastic deformation amount in the flexible portion 3a2 and enables electrical connection between the battery cell 2 and the circuit board 20, for example. It is made of aluminum.

The pin portion 3b is a portion erected upward from the tip portion of the bar portion 3a, and has a shaft portion 3b1 and a press-fit portion 3b2. The shaft portion 3b1 is a rod-shaped portion extending upward from the tip end portion of the base portion 3a1 of the bar portion 3a. That is, the shaft portion 3b1 is erected at the tip end portion of the base portion 3a1 in a state where the direction toward which the shaft core faces is the vertical direction. The shaft portion 3b1 is connected to the base portion 3a1 by welding, for example.

FIG. 3 is an exploded cross-sectional view showing an example of a state when the bar portion 3a and the pin portion 3b are connected. As shown in this figure, a flat plate-shaped mounting portion 3b3 is provided at the lower end of the shaft portion 3b1 with the front and back surfaces facing in the direction (vertical direction) along the shaft portion 3b1. When the pin portion 3b is connected to the bar portion 3a, the mounting portion 3b3 is welded to the bar portion 3a. Thereby, the welding work can be easily performed.

The press-fitting portion 3b2 is arranged at a substantially central portion in the vertical direction of the shaft portion 3b1. That is, the press-fitting portion 3b2 is provided in the middle portion of the shaft portion 3b1. The press-fitting portion 3b2 is a portion provided so as to bulge outward from the shaft portion 3b1 in the radial direction, and a cavity portion is provided inside the shaft portion 3b1 in the radial direction. The maximum width of the press-fitting portion 3b2 in the left-right direction is set to be the same as or slightly larger than the inner diameter of the through hole 21 of the circuit board 20. Such a press-fitting portion 3b2 is press-fitted into the through hole 21 of the circuit board 20, thereby being press-fitted and fixed to the circuit board 20. It is preferable that the vertical dimension of the press-fitting portion 3b2 is set to be larger than the depth dimension (vertical dimension) of the through hole 21 of the circuit board 20.

The pin portion 3b having such a shaft portion 3b1 and a press-fitting portion 3b2 has a higher rigidity than the bar portion 3a in order to prevent plastic deformation when the press-fitting portion 3b2 is inserted into the circuit board 20. For example, it is made of copper.

The circuit board 20 is an electronic board on which a voltage detection circuit or the like for detecting the voltage between terminals of the battery cell 2 is formed, and has wiring patterns and elements (not shown). As shown in FIG. 1, the circuit board 20 has a plurality of through holes 21 into which the connection terminal 3 of the cell unit 10 is press-fitted. A plating layer forming a part of the metal wiring is formed on the inner wall surface of these through holes 21. Therefore, the press-fitting portion 3b2 of the connection terminal 3 is press-fitted into the through hole 21, and the outer wall surface of the press-fitting portion 3b2 and the inner wall surface of the through hole 21 are press-fitted, so that the battery cell 2 and the circuit board 20 are electrically contacted. Connected to.

When assembling such a battery device 1, for example, the connection terminal 3 is press-fitted into the circuit board 20 before being fixed to the battery cell 2. At this time, the pin portion 3b of the connection terminal 3 is inserted into the through hole 21 of the circuit board 20, and the pin portion 3b is press-fitted into the through hole 21 until the press-fitting portion 3b2 is located inside the through-hole 21.

After the pin portion 3b is press-fitted into the through hole 21 and fixed, the connection terminal 3 is fixed to the battery cell 2. Here, the output terminal 2a of the battery cell 2 is inserted into the connection hole 3a3 provided at the base portion of the base portion 3a1, and the output terminal 2a and the root portion of the base portion 3a1 are joined by welding. Here, in the present embodiment, since the connection terminal 3 has the flexible portion 3a2, even if the positional accuracy between the connection hole 3a3 and the output terminal 2a includes an error, the connection terminal 3 can be easily output to the connection hole 3a3. The terminal 2a can be inserted.

According to the battery device 1 of the present embodiment as described above, the connection terminal 3 for connecting the battery cell 2 and the circuit board 20 has a press-fitting portion 3b2 to be press-fitted and fixed to the circuit board 20. Therefore, the battery cell 2 and the circuit board 20 can be electrically connected without soldering or screwing the connection terminal 3 and the circuit board 20. Therefore, according to the battery device 1 of the present embodiment, in order to electrically connect the battery cell 2 and the circuit board 20, it is not necessary to perform soldering or screwing work, which simplifies the assembly work. It is possible to plan.

Further, in the battery device 1 of the present embodiment, the connection terminal 3 is provided at the base portion 3a1 whose root portion is fixed to the battery cell 2 and the intermediate portion of the base portion 3a1, and the tip portion of the base portion 3a1 is at the root. It has a flexible portion 3a2 that can be displaced with respect to the portion, a shaft portion 3b1 that is erected at the tip portion of the base portion 3a1, and a press-fit portion 3b2 that is provided in an intermediate portion of the shaft portion 3b1. Therefore, the battery cell 2 and the circuit board 20 can be connected by the connection terminal 3 having a simple structure.

Further, in the battery device 1 of the present embodiment, since the connection terminal 3 has a flexible portion 3a2 provided in the middle portion of the base portion 3a1, the battery cell 2 and the circuit board are caused by thermal deformation or vibration of the vehicle. Even if the relative position with respect to 20 changes, the change in the relative position can be absorbed by the elastic deformation of the flexible portion 3a2. Therefore, it is possible to prevent a large stress from acting locally on the connection terminal 3 itself or the connection point between the connection terminal 3 and the battery cell 2 or the circuit board 20.

Further, in the battery device 1 of the present embodiment, the shaft portion 3b1 is erected at the tip end portion of the base portion 3a1. Therefore, when the pin portion 2b is press-fitted into the circuit board 20, the axial force received by the pin portion 2b can be received on a wide surface of the base portion 3a1. Therefore, it is possible to prevent a large stress from acting on the flexible portion 3a2 at the time of press-fitting, and to prevent the flexible portion 3a2 from being plastically deformed at the time of press-fitting.

Further, in the battery device 1 of the present embodiment, the flexible portion 3a2 is shaped like a bridge protruding from the base portion 3a1 toward the circuit board 20. Therefore, as shown in FIG. 2, the flexible portion 3a2 can be provided without interfering with the battery cell 2. Further, rather than providing a flexible portion that is curved in the front-rear, left-right plane, the flexible portion 3a2 can be easily formed with respect to the band-shaped bar portion 3a whose front and back surfaces are directed in the vertical direction.

Further, in the battery device 1 of the present embodiment, the flexible portion 3a2 is arranged at a position avoiding the circuit board 20 when viewed from the direction along the shaft portion 3b1. Therefore, it is possible to prevent the circuit board 20 from interfering with the flexible portion 3a2 when the connection terminal 3 is press-fitted into the circuit board 20 or after the connection terminal 3 is press-fitted into the circuit board 20.

Further, in the battery device 1 of the present embodiment, the bar portion 3a having the base portion 3a1 and the flexible portion 3a2 and the pin portion 3b having the shaft portion 3b1 and the press-fitting portion 3b2 are formed of different metal materials. .. Since the required functions are different between the bar portion 3a and the pin portion 3b, the required functions can be enhanced for each portion by forming the bar portion 3a and the pin portion 3b with different metal materials. For example, since the battery device 1 of the present embodiment is mounted on a vehicle, by forming the bar portion 3a from aluminum, the bar portion 3a is provided with a function of flexibly elastically deforming with respect to the vibration of the vehicle. Can be granted. Further, by forming the pin portion 3b from copper, it is possible to prevent the pin portion 3b from buckling or the like when it is press-fitted into the circuit board 20.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. In the description of the second embodiment, the same parts as those of the first embodiment will be omitted or simplified.

FIG. 4 is an enlarged cross-sectional view showing a schematic configuration of a pin portion 3c of a connection terminal included in the battery device of the present embodiment. The pin portion 3c is a portion erected upward from the tip portion of the bar portion 3a, similarly to the pin portion 3b of the first embodiment, and is press-fitted with the shaft portion 3c1 as shown in FIG. It is provided with a portion 3c2.

The shaft portion 3c1 is a rod-shaped portion extending upward from the tip end portion of the base portion 3a1 of the bar portion 3a. That is, the shaft portion 3c1 is erected at the tip end portion of the base portion 3a1 in a state where the direction toward which the shaft core faces is the vertical direction. The shaft portion 3c1 is connected to the base portion 3a1 by welding, for example.

The press-fitting portion 3c2 is arranged at a substantially central portion in the vertical direction of the shaft portion 3c1. That is, the press-fitting portion 3c2 is provided in the middle portion of the shaft portion 3c1. The press-fitting portion 3b2 is a portion provided so as to bulge outward from the shaft portion 3c1 in the radial direction, and a cavity portion is provided inside the shaft portion 3c1 in the radial direction. The maximum width of the press-fitting portion 3c2 in the left-right direction is set to be the same as or slightly larger than the inner diameter of the through hole 21 of the circuit board 20.

Further, in the present embodiment, in the region R shown in FIG. 4, the outer wall surface of the press-fitting portion 3c2 is a flat surface portion parallel to the direction along the shaft portion 3c1. According to the press-fitting portion 3c2 having such a flat surface portion, the press-fitting portion 3c2 is pressed against the inner wall surface of the through hole 21 over a long distance in the vertical direction. Therefore, according to the battery device of the present embodiment, the variation in the press-fitting amount of each terminal 3 and each through hole 21 is absorbed, and the battery cell 2 and the circuit board 20 are more reliably connected electrically. be able to.

Although the preferred embodiment of the present invention has been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to the above embodiment. The various shapes and combinations of the constituent members shown in the above-described embodiment are examples, and can be variously changed based on design requirements and the like without departing from the spirit of the present invention.

For example, in the above embodiment, a configuration in which one flexible portion 3a2 is provided in an intermediate portion of the base portion 3a1 has been described. However, the present invention is not limited to this. For example, a plurality of flexible portions may be installed in the middle portion of the base portion 3a1. In this case, it is not necessary that the plurality of flexible portions installed in one base portion 3a1 have the same shape. For example, a flexible portion that allows the tip of the base portion 3a1 to be displaced mainly in the left-right direction with respect to the root portion, and a flexible portion that allows the tip portion of the base portion 3a1 to be displaced mainly in the front-rear direction with respect to the root portion. And may be installed.

Further, in the above embodiment, a configuration has been described in which a flexible portion 3a2 is provided in the middle portion of the base portion 3a1 so that the tip portion of the base portion 3a1 can be displaced mainly in the left-right direction with respect to the root portion. However, the present invention is not limited to this. For example, it is also possible to adopt a configuration in which a flexible portion wound in a spiral shape when viewed from above is provided. In such a case, the tip portion of the base portion 3a1 can be displaced in the front-back and left-right directions with respect to the root portion.

1 ... Battery device, 2 ... Battery cell, 2a ... Output terminal, 2b ... Pin part, 3 ... Connection terminal, 3a ... Bar part, 3a1 ... Base part, 3a2 ... Flexible part, 3a3 ... Connection hole, 3b ... Pin part, 3b1 ... Shaft part, 3b2 ... Press-fitting part, 3b3 ... Mounting part, 3c ... Pin part, 3c1 ... Shaft part, 3c2 ... Press-fitting part, 10 ... Cell unit, 20 ... circuit board, 21 ... through hole

Claims (3)

A battery device including a plurality of battery cells, a circuit board electrically connected to the battery cells, and a connection terminal for connecting the battery cells and the circuit board.
The connection terminal has a press-fitting portion to be press-fitted and fixed to the circuit board.
The connection terminal is
The base part whose root part is fixed to the battery cell and
A flexible portion provided in the middle of the base portion and allowing the tip portion of the base portion to be displaced with respect to the root portion.
A shaft portion erected at the tip of the base portion and a shaft portion
It has the press-fitting portion provided in the middle of the shaft portion, and has.
A battery device characterized in that the base portion and the flexible portion, and the shaft portion and the press-fitting portion are formed of different metal materials. A battery device including a plurality of battery cells, a circuit board electrically connected to the battery cells, and a connection terminal for connecting the battery cells and the circuit board.
The connection terminal has a press-fitting portion to be press-fitted and fixed to the circuit board.
The connection terminal is
The base part whose root part is fixed to the battery cell and
A flexible portion provided in the middle of the base portion and allowing the tip portion of the base portion to be displaced with respect to the root portion.
A shaft portion erected at the tip of the base portion and a shaft portion
It has the press-fitting portion provided in the middle of the shaft portion, and has.
The press-fitting portion bulges outward from the shaft portion in the radial direction, and has a flat surface portion on the outer wall surface parallel to the direction along the shaft portion.
The base portion and the flexible portion, and the shaft portion and the press-fitting portion are formed of different metal materials.
A battery device characterized by that. The flexible portion is shaped like a bridge protruding from the base portion in the direction toward the circuit board.
The battery device according to claim 2, wherein the flexible portion is arranged at a position avoiding the circuit board when viewed from a direction along the shaft portion.

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