KR100669331B1 - Secondary battery module - Google Patents

Abstract

The present invention provides a plurality of unit cells, and end plates disposed at both ends of the battery assembly in which the unit cells are stacked to more easily align the unit cells and the battery partitions to prevent misalignment between the unit cells and the battery partitions. A secondary battery module is provided between a connection rod and a nut that press-fits the end plate, and a restricting unit provided between the end plate and the position plate to regulate the position of the unit battery.

Regulating part, fixing member, groove, support groove, through hole

Description

Secondary Battery Module {SECONDARY BATTERY MODULE}

1 is an exploded perspective view showing the configuration of a battery module according to an embodiment of the present invention.

2 is a schematic side cross-sectional view showing a battery module according to an embodiment of the present invention.

3 is a perspective view illustrating some components of a battery module according to an exemplary embodiment of the present invention.

4 is a perspective view illustrating some components of a battery module according to another embodiment of the present invention.

The present invention relates to a secondary battery, and more particularly, to a secondary battery module capable of improving the assembling property of a battery and a partition wall when a unit cell is connected to form a battery module.

A secondary battery is a battery that can be charged and discharged unlike a primary battery that cannot be charged. A secondary battery is a low-capacity battery that is used in portable electronic devices such as phones, notebook computers, and camcorders. It is widely used as a power source for driving a motor.

The secondary battery may be manufactured in various shapes, and typical shapes include cylindrical and rectangular shapes. The secondary battery may include the high output secondary battery so that the secondary battery may be used for driving a motor such as an electric vehicle. A plurality of secondary batteries are connected in series to form a large capacity secondary battery.

As described above, one large capacity secondary battery (hereinafter, referred to as a battery module for convenience of description throughout) is made of a plurality of secondary batteries (hereinafter, referred to as unit cells for convenience of explanation throughout the specification), which are each connected in series. The unit cell of the positive electrode plate and the negative electrode plate disposed between the separator, the case having a space portion in which the electrode assembly is built, the cap assembly coupled to the case and sealed, the cap assembly protrudes And a positive electrode and a negative electrode terminal electrically connected to the current collector of the positive electrode and the negative electrode plate provided in the electrode assembly.

Each unit cell is arranged in a row, and a battery module is constructed by connecting and installing a conductor between nuts through a screwed negative electrode terminal and a positive electrode terminal.

However, each unit cell generates heat internally at the time of operation, and in the case of the battery module composed of a plurality of unit cells, it is possible to smoothly perform the function only when it is possible to easily release heat generated.

In order to dissipate heat in a battery module, a conventional battery module arranges several unit cells side by side in a housing, and installs cell partition walls having passages through which refrigerant flows, thereby circulating the refrigerant. Is cooled and maintains the gap between the unit cells.

Then, in the case of the conventional battery partition, there is a problem in that the assembly position between the unit cell and the battery partition is difficult to assemble when the battery module is assembled, the position does not fit properly and assembly failure occurs.

As such, since a conventional battery module is very difficult to align between a battery and a battery partition wall, a considerable amount of time and effort are required and when dozens of unit cells are stacked, such as a secondary battery module applied to a patented hybrid electric vehicle (HEV). This problem becomes even larger.

In addition, since the alignment between the battery and the battery partition is difficult as described above, in the case of the conventional battery module, the position between the battery and the battery partition is not uniform, which leads to poor assembly, which causes the performance degradation of the battery module.

Accordingly, the present invention has been made in view of the above-mentioned problems, and an object of the present invention is to make it easier to align the unit cell and the battery partition wall, thereby preventing the secondary battery module from misalignment between the unit cell and the battery partition wall. In providing.

In order to achieve the above object, the battery module of the present invention includes a plurality of unit cells, end plates disposed at both ends of a battery assembly in which the unit cells are stacked, connecting rods and nuts for press-fitting the end plates, and the end plates. It is provided between the control unit for regulating the position of the unit battery.

The end plate includes a flat portion in contact with a side surface of the battery assembly, and a fastening portion protruding to a distal end of the flat portion, and the connecting rod penetrates through a hole formed in the fastening portion.

In addition, the regulating portion includes a fixing member in contact with one side of the battery assembly, and a groove formed on the contact surface of the fixing member and having a size corresponding to that of the unit battery to accommodate the unit battery.

Preferably, the fixing member is positioned at the bottom of the unit battery when the terminal of the unit battery is oriented upward.

Here, the installation position of the fixing member is not limited to the bottom side of the unit battery and may be installed at both side ends of the unit battery.

Accordingly, the fixing member is inserted into the groove of the lower end of the unit battery can be regulated its position.

And the fixing part is made of an insulating material, preferably a plastic material.

In addition, the battery module according to the present invention may be provided with a battery partition wall for maintaining a gap between the unit cells between the unit cells to distribute the cooling medium therebetween.

The interval between the groove and the groove of the fixing member may correspond to the thickness of the battery partition wall installed between the unit cells.

Therefore, the cell and the cell partition wall installed therebetween are placed between the grooves and the grooves are regulated, whereby the height of the unit cell and the cell partition wall can be uniformly matched.

On the other hand, the fixing member for the coupling between the fixing member and the end plate constituting the regulating portion has a structure that is placed on the connecting rod is installed in the lower portion of the end plate.

Preferably, the lower end of the fixing member may be formed along the longitudinal direction at the position corresponding to the connecting rod is a support groove for mounting the connecting rod for fastening the end plate.

In addition, the present invention may be formed in a position where the fixing member is a through hole in which the connecting rod is fitted along the longitudinal direction corresponding to the connecting rod.

Accordingly, the fixing member can be easily installed between the end plate.

Here, the secondary battery module is an energy source for driving a motor of the device in a device that operates by using a motor such as a hybrid electric vehicle (HEV), an electric vehicle (EV), a wireless cleaner, an electric bicycle, an electric scooter, and the like. Can be used

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

In the following description, a case of using air as a cooling method of the battery module will be described as an example.

1 is an exploded perspective view showing the configuration of a battery module according to an embodiment of the present invention.

Looking at the large capacity battery module 10 with reference to the drawings, a positive electrode and a negative electrode plate having an electrode assembly positioned between the separator plate to produce power and the unit cell 11, the unit cell 11 A battery partition 13 installed between the battery cells 13 to maintain an interval to allow air to flow between the unit cells, and to support the side surfaces of the unit cells 11, wherein the unit cells 11 and the battery partition walls 13 are stacked; End plate 20 which is installed in close contact with both side ends of the assembly 14, the connecting rod 24 and the connecting rod is installed between the end plate 20 to tighten the end plate 20 to fix the battery assembly 14 And nut 25 fastened to 24.

The end plate 20 has a flat portion 21 formed of a sufficient size to cover the entire surface of the unit cell 11 or the battery partition wall 13 and an outer side of each of the top and bottom portions of the flat portion 21. The fastening part 22 is formed to be integrally formed, and the fastening part 22 has a structure in which a hole 23 is formed so that the connection rod 24 penetrates.

Herein, the upper end of the flat part 21 refers to the flat part of the end plate 20 when the unit cell 11 is oriented so that the terminal 12 of the unit cell 11 faces upward, as shown in FIG. 1. (21) It means the upper side and the lower side is defined as the lower side.

In the present embodiment, two fastening portions 22 are installed at both ends of the flat portion 21, but the present invention is not limited thereto. The number of the fastening portions 22 may be variously applied, such as one at the center.

In addition, the connecting rod 24 has a length corresponding to the stacking length of the battery assembly 14 and the two end plates 20 in the form of bolts, and a screw thread is formed at the front end to which the nut 25 is fastened. It is structured.

The end plate 20 having the above structure penetrates the connecting rod 24 through the holes 23 of the respective fastening portions 22 in a state of being in close contact with both ends of the battery assembly 14, and has one side fastening portion. The battery assembly 14 is tightened and fixed by fastening the nut 25 to the distal end of the connecting rod 24 protruding through the hole 23 of the 22.

According to the present exemplary embodiment of the battery module 10 having the above-described structure, the fixing member 30 in which the unit cell 11 and the battery partition wall 13 are disposed and the position thereof is restricted under the end plate 20 is disposed. ) Is further installed.

As shown in FIG. 1, the fixing member 30 has a bottom surface of the battery assembly 14 such that a battery assembly 14 formed by a rectangular unit cell 11 and a battery partition wall 13 interposed therebetween is placed. And the corresponding size. A plurality of protrusions are formed on one surface of the fixing member 30, and the battery partition wall 13 is disposed on the protrusions. The groove 31 between the neighboring protrusions is formed to have a size corresponding to that of the unit cell 11 so that the unit cell 11 is seated.

The depth of the groove 31 may be such that the unit cell 11 can be caught, and the numerical value thereof is not particularly limited.

In addition, between the grooves 31, that is, the protrusion is a space where the battery partition wall 13 is located, and the thickness of the protrusion corresponds to the thickness of the battery barrier wall 13.

As such, the unit cells 11 and the battery partition 13 constituting the battery assembly 14 are installed on the fixing member 30, so that the positions of the unit cells 11 and the battery partition 13 may be uniformly aligned. It can be.

On the other hand, Figure 2 is a cross-sectional view showing the assembled state of the battery module according to the above-described drawing, the fixing member 30 is located under the battery assembly 14 and the end plate between the two end plates 20 It is structured on the connection rod 24 which connects the lower part of the 20.

That is, the end plate 20 is connected to the connection rod 24 through the holes 23 of the fastening portion 22 formed in the upper and lower, respectively, as fastened and assembled with a nut 25, the battery assembly ( 14, the fixing member 30 is supported on the connecting rod 24 in a state that the fixing member 30 is placed on the connecting rod 24 installed on the bottom of the end plate 20. I'm doing it.

To this end, as shown in FIG. 3, a connection rod 24 is disposed on a bottom surface of the fixing member 30 in a position corresponding to two connection rods 24 installed at a lower portion of the connection rod 24. Has a structure in which a supporting groove 32 is placed.

Accordingly, the fixing member 30 may be placed on the connection rod 24 more stably by the support groove 32 is placed in the connection rod 24 and the connection rod 24 is seated in the support groove 32. In the unit cell 11 and the battery partition 13 can be mounted thereon.

On the other hand, Figure 4 is a view showing another embodiment of the present fixing member (30).

According to the above drawings, the fixing member 30 has grooves 31 formed at intervals so that the unit cell 11 is placed on the top thereof, and the through-holes along the longitudinal direction of the connection rod 24 are formed therethrough. 33) is formed.

Here, the through hole 33 is formed at a position corresponding to the position of the connecting rod 24 installed in the fastening portion 22 of the end plate 20.

By forming the through hole 33 in the fixing member 30 in this way, the fixing member 30 can be installed in the connecting rod 24 through the through hole 33, in which the connecting rod 24 is By being attached to the two end plates 20 it is possible to further solidify the bonding force of the fixing member (30).

The above-described battery module of the present invention can be effectively used as a battery for HEV requiring high output / large capacity, but its use is not necessarily limited to HEV.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to

As described above, according to the present embodiment, when the battery module is assembled, the positions between the unit cells installed in the module and the battery partition wall are uniformly aligned, thereby reducing the time and effort required for the unit battery alignment work.

In addition, according to the present invention, the unit cell and the battery partition wall in the battery module can be aligned properly, thereby providing uniform cooling conditions for each unit cell.

In addition, it is possible to prevent battery breakage due to poor assembly of each unit battery and the battery partition in the battery module, thereby increasing the reliability of the battery module.

Claims (12)

A battery assembly including a plurality of unit cells and a battery partition wall disposed between the unit cells; End plates disposed at both ends of the battery assembly; A connecting rod and a nut for pressurizing the end plate; And A fixing member having a plurality of protrusions formed on one surface, the battery partition wall is disposed on the protrusions Secondary battery module comprising a. The end plate of claim 1, wherein the end plate includes a flat portion that is in contact with a side surface of the battery assembly, and a fastening portion that protrudes toward an opposite end of the flat portion, and the connection rod is penetrated through a hole formed in the fastening portion. Secondary battery module of structure. The secondary battery module of claim 1, wherein the unit battery is sandwiched between the neighboring protrusions. delete The secondary battery module of claim 1, wherein the fixing member is positioned at the bottom of the unit battery when the terminal of the unit battery is oriented upward. The secondary battery module of claim 1, wherein the fixing member is installed at a side end of the unit battery. The secondary battery module of claim 1, wherein the fixing member is made of an insulating material such as plastic. The rechargeable battery module of claim 1, wherein a thickness of the protrusion of the fixing member corresponds to a thickness of the battery partition wall. The secondary battery module of claim 1, wherein the fixing member is disposed on and supported by a connection rod installed under the end plate. The secondary battery module of claim 1, wherein a support groove in which the connection rod is seated is formed at a lower end of the fixing member along a length direction at a position corresponding to the connection rod. The secondary battery module of claim 1, wherein the fixing member has a through hole in which the connection rod is fitted along a length direction of the fixing member at a position corresponding to the connection rod. The secondary battery module of claim 1, wherein the battery module is for driving a motor.

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