CN108701798A - Battery connection module, the manufacturing method of battery connection module, battery pack and guard block - Google Patents

Abstract

Battery connection module (1) has:Busbar (2), it is with busbar body (21) and relative to busbar body to the side bending of thickness direction and multiple interconnecting pieces (22) for being connect respectively with each battery unit (4), and fuse part (27) is equipped between the busbar body and battery unit of interconnecting piece, multiple battery units are electrically connected;The guard block (3) of insulating properties configures between busbar body and battery unit, and with the multiple cylindrical portions (32) for surrounding multiple interconnecting pieces respectively.

Description

Battery connection module, manufacturing method of battery connection module, battery pack, and protective component

technical field

The invention relates to a battery connection module, a manufacturing method of the battery connection module, a battery pack and a protection component.

Background technique

Currently, there are bus bars connected to the electrodes of the battery cells. Patent Document 1 discloses a technology of a connection member including a substrate and a plurality of connection parts connected to electrodes of each storage element, which are fused when a current of a predetermined value or more flows to cut off the connection with the power storage device. The connection part for the electrical connection of the storage element. The connecting portion of Patent Document 1 is formed by punching a substrate, and has at least two bent portions bent in the punching direction.

The connection member of Patent Document 1 has the fusing characteristics as a fuse, and can efficiently absorb and disperse stress against displacement in three-dimensional directions between the power storage element and the connection member due to vibration or the like.

prior art literature

patent documents

Patent Document 1: (Japanese) Unexamined Patent Application Publication No. 2014-154337

The problem to be solved by the invention

Like the connection member of Patent Document 1, when the fuse portion is blown, it is desired to suppress failures such as fragments generated by the blown being scattered to surrounding battery cells.

Contents of the invention

An object of the present invention is to provide a battery connection module, a method of manufacturing the battery connection module, a battery pack, and a protective member capable of suppressing troubles caused by fragments generated by fusing.

Technical solutions for solving problems

The battery connection module of the present invention is characterized in that it includes: a bus bar having a bus bar main body and a plurality of connection parts bent to one side in the thickness direction with respect to the bus bar main body and connected to the respective battery cells, and the A fuse part is provided between the bus bar main body and the battery unit in the connection part, and electrically connects a plurality of the battery units; an insulating protection member is arranged between the bus bar main body and the battery unit , having a plurality of cylindrical portions respectively surrounding the plurality of connection portions.

In the battery connection module described above, it is preferable that the front end of the cylindrical portion is closed by an end surface of the battery unit in a state assembled to the battery unit.

In the battery connection module described above, it is preferable that the protection member has a cover portion that connects the plurality of cylindrical portions to each other and covers a surface of the bus bar main body on the battery cell side.

The manufacturing method of the battery connection module according to the present invention is characterized in that the above-mentioned battery connection module is manufactured, and it is characterized in that it includes: a punching process, which performs punching processing on the busbar, and leaves the base of the connecting part through the punching processing. A part between the end and the front end and the coupling part of the busbar main body are formed to form the connecting part; a protection part assembly process is performed after the punching process, and the protection part is assembled to the bus bar a cutting process, which is performed after the protective component assembly process, and cuts the connecting portion; a bending process, which is performed after the cutting process, and makes the connecting portion face the thickness direction of the busbar main body one side is bent.

The battery pack of the present invention is characterized by comprising: a plurality of battery cells; a bus bar having a bus bar main body and a plurality of connecting portions bent from the bus bar main body to one side in the thickness direction and connected to the respective battery cells. , and a fuse part is provided between the busbar main body and the battery unit of the connection part, and electrically connects a plurality of the battery units; an insulating protection component is arranged between the busbar main body and the battery unit Between the battery cells, there are a plurality of cylindrical portions respectively surrounding the plurality of connection portions.

The protection member of the present invention is characterized in that it includes a plurality of insulating cylindrical parts connected to each other in a state arranged in parallel, and the plurality of cylindrical parts are respectively surrounded by bending from the bus bar main body to one side in the thickness direction, and respectively A plurality of connection parts connected to each battery cell.

Invention effect

The battery connection module of the present invention includes: a bus bar, which has a bus bar main body and a plurality of connection parts that are bent to one side in the thickness direction relative to the bus bar main body and are respectively connected to each battery unit, and the bus bar main body and the battery unit at the connection part A fuse part is provided therebetween to electrically connect a plurality of battery cells; an insulating protection member is arranged between the bus bar main body and the battery cells and has a plurality of cylindrical parts respectively surrounding the plurality of connection parts. According to the battery connection module of the present invention, by surrounding the connection portions with the cylindrical portions, it is possible to suppress defects caused by fragments generated by fusing of the fuse portion.

Description of drawings

FIG. 1 is a side view of a battery pack according to an embodiment;

2 is a perspective view showing the inside of the battery pack according to the embodiment;

Fig. 3 is the plan view of the bus bar of embodiment;

Fig. 4 is the side view of the bus bar of embodiment;

Fig. 5 is a perspective view of the protection component of the embodiment;

Fig. 6 is a perspective view of the protective member of the embodiment viewed from the lower side;

7 is a cross-sectional view of the interior of the battery pack according to the embodiment;

8 is a sectional view of main parts of the battery pack according to the embodiment;

9 is a perspective view illustrating the assembly procedure of the battery connection module according to the embodiment;

10 is a plan view showing main parts of a bus bar according to a first modified example of the embodiment;

Fig. 11 is a plan view showing a busbar after a bending step according to a first modified example of the embodiment.

Detailed ways

Hereinafter, a battery connection module, a method of manufacturing the battery connection module, a battery pack, and a protective member according to embodiments of the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited to this embodiment. In addition, the constituent elements of the embodiments described below include elements that can be easily conceived by those skilled in the art or are substantially the same.

[implementation mode]

An embodiment will be described with reference to FIGS. 1 to 9 . This embodiment relates to a battery connection module, a method of manufacturing the battery connection module, a battery pack, and a protective member. 1 is a side view showing the battery pack according to the embodiment, FIG. 2 is a perspective view showing the inside of the battery pack according to the embodiment, FIG. 3 is a top view of the bus bar according to the embodiment, FIG. 4 is a side view of the bus bar according to the embodiment, and FIG. 5 6 is a perspective view of the protective member of the embodiment viewed from the lower side, FIG. 7 is a cross-sectional view of the inside of the battery pack of the embodiment, and FIG. 8 is a cross-section of main parts of the battery pack of the embodiment. 9 is a perspective view illustrating the assembly procedure of the battery connection module according to the embodiment. In addition, in FIG. 1 , the side walls of the housing 101 are omitted, and the inside of the housing 101 is shown.

As shown in FIG. 1 , the battery pack 100 of this embodiment has a housing 101 , a battery connection module 1 and a battery module 10 . The shape of the housing 101 is, for example, a hollow rectangular parallelepiped. The frame body 101 has a bottom wall portion 101a, a top plate portion 101b, and a side wall portion connecting the bottom wall portion 101a and the top plate portion 101b. The battery connection module 1 and the battery module 10 are accommodated inside the frame body 101 . The connection member 5, the cover 6, the insulating cover 7, etc. are accommodated also in the housing|casing 101. As shown in FIG. The battery connection module 1 of this embodiment includes: a bus bar 2 , a protective member 3 and a cover 6 .

The battery module 10 includes a plurality of battery stacks 11 . Each battery stack 11 is an aggregate of a plurality of battery cells 4 . The battery stack 11 of this embodiment has ten battery cells 4 . The battery cell 4 has a cylindrical shape, has a positive electrode at one end in the axial direction, and has a negative electrode at the other end. In each battery stack 11 , the battery cells 4 are arranged so that the same side in the axial direction faces the same pole. That is, in one battery stack 11, the same poles of the battery cells 4 are adjacent to each other. In the battery stack 11 of the present embodiment, the battery cells 4 are arranged in two rows, and five cells are arranged in each row.

The bus bar 2 and the connecting member 5 electrically connect the battery cells 4 of the battery stack 11 in parallel. In the battery pack 100 of the present embodiment, each battery cell 4 is accommodated in the housing 101 with the positive electrode facing upward and the negative electrode facing downward. The bus bar 2 electrically connects positive electrodes of the plurality of battery cells 4 to each other. The connecting member 5 electrically connects the negative electrodes of the plurality of battery cells 4 to each other. The connection member 5 is a plate-shaped member made of a conductive material such as metal. The connection part 5 is disposed at the bottom of the frame body 101 . The connection member 5 has a main body 5a, a plurality of connection parts 5b, and a terminal part 5c. The main body 5a is a flat plate-shaped main body portion. The connecting portion 5b is bent upward from the main body 5a. The connection portion 5 b is electrically connected to the negative electrode of the battery cell 4 and supports the battery cell 4 from below. The terminal portion 5c is bent downward from the main body 5a. The terminal portion 5c is electrically connected to the bus bar 2 of the adjacent battery stack 11 .

In the battery pack 100 of the present embodiment, a plurality of battery stacks 11 are electrically connected in series. More specifically, the battery stacks 11 are arranged in a straight line along the longitudinal direction in the housing 101 . Here, in this specification, “longitudinal” refers to the longitudinal direction of the battery stack 11 and the housing 101 . In addition, the "horizontal direction" refers to the short side direction of the battery stack 11 and the housing 101, and is a direction perpendicular to the longitudinal direction.

As shown in FIGS. 3 and 4 , the bus bar 2 has a bus bar main body 21 and a connection portion 22 . The bus bar 2 is formed by, for example, punching a metal plate by press working. The busbar main body 21 and the connection part 22 are integrally formed. The bus bar main body 21 is plate-shaped and has through-holes 21 a corresponding to the respective battery cells 4 . The through hole 21 a is formed by punching so that the connecting portion 22 remains. The general shape of the through-hole 21a in plan view is a rectangle, for example, a square. The through hole 21a has a first wall surface 21b, a second wall surface 21c, a third wall surface 21d, and a fourth wall surface 21e. The first wall surface 21b and the third wall surface 21d face each other in the longitudinal direction. The second wall surface 21c and the fourth wall surface 21e face each other in the lateral direction.

The connecting portion 22 has a plate-shaped portion 23 and a belt-shaped connecting portion 24 . The plate-like portion 23 is a flat plate-shaped constituent portion having a rectangular shape in plan view. The plate-like portion 23 is coupled to the front end of the link portion 24 . The plate-shaped part 23 has a protrusion 23a in the center part. The protrusion 23 a protrudes downward, and is formed, for example, by partially bending the plate-like portion 23 . The plate portion 23 is connected to the positive electrode 41 of the battery cell 4 by welding, for example, resistance welding. A corresponding one of the plate parts 23 is electrically connected to one of the battery cells 4 . That is, the plurality of connection portions 22 of the bus bar 2 are connected to the respective battery cells 4 .

The connecting portion 24 is a strip-shaped constituent portion, and is integrally formed with the bus bar main body 21 and the plate-like portion 23 . The connecting portion 24 has a first configuration portion 25 and a second configuration portion 26 . The first configuration portion 25 extends in the longitudinal direction from the first wall surface 21b to the third wall surface 21d. The base end of the first constituent portion 25 is coupled to a position of the first wall surface 21b close to the second wall surface 21c. In other words, the first constituent portion 25 extends in the longitudinal direction along the second wall surface 21c. The first configuration part 25 is located on the same surface as the busbar main body 21 .

The second configuration portion 26 extends in the lateral direction from the front end of the first configuration portion 25 toward the fourth wall surface 21e. The second configuration portion 26 extends along the third wall surface 21d. As shown in FIG. 3 , the second constituent portion 26 is perpendicular to the first constituent portion 25 . The second constituent part 26 is coupled with the front end of the first constituent part 25 and the plate-like part 23 . The front end of the second constituent portion 26 is bent toward the first wall surface 21 b while being coupled with the plate-like portion 23 .

As shown in FIG. 4 , the second configuration portion 26 is bent downward. More specifically, the second configuration portion 26 is bent at the first bending portion 26a and the second bending portion 26b, respectively. In the second constituent part 26 , the distance between the first constituent part 25 and the first bent part 26 a is horizontal, that is, parallel to the bus bar main body 21 . The second constituent portion 26 is bent obliquely downward in the first bent portion 26a. In the second configuration part 26, the distance between the first curved part 26a and the second curved part 26b is inclined so as to gradually approach the second curved part 26b downward. The second configuration part 26 is bent in the horizontal direction at the second bending part 26b. In the second configuration part 26 , the distance between the second bent part 26 b and the plate-like part 23 is horizontal, that is, parallel to the busbar main body 21 . In this way, the connection portion 22 is bent toward one side in the thickness direction of the bus bar body 21 with respect to the bus bar body 21 . In the bus bar main body 21, the surface facing the battery cell 4 side facing the lower side is called "back surface 21f", and the surface facing the upper side opposite to the back surface 21f is called "surface 21g".

As shown in FIG. 3 , the connection portion 22 has a fuse portion 27 . The fuse unit 27 is blown when a current exceeding a predetermined current value flows, and has a fuse function of cutting off the bus bar main body 21 and the battery unit 4 . The fuse section 27 in this embodiment is a part of the second configuration section 26 . The cross-sectional area of the fuse portion 27 is smaller than that of other portions of the second configuration portion 26 . This difference in cross-sectional area is achieved, for example, by making the fuse portion 27 smaller in width than the other portions of the second configuration portion 26 . In addition, instead of using a part of the second configuration part 26 as the fuse part 27 , the entire second configuration part 26 may be used as the fuse part 27 . In this case, the cross-sectional area of the second constituent portion 26 is smaller than that of the first constituent portion 25 .

As shown in FIG. 5 , the protective member 3 has a cover portion 31 as a main body and a plurality of cylindrical portions 32 . The cover portion 31 and the cylindrical portion 32 are formed of an insulating material such as synthetic resin. The cover portion 31 covers the surface of the bus bar main body 21 on the battery cell 4 side, that is, the rear surface 21f. The cover portion 31 of the present embodiment has a two-layer structure of the first cover portion 33 and the second cover portion 34 . The cover part 31 may be configured by integrally forming the first cover part 33 and the second cover part 34 , or may be composed of the first cover part 33 and the second cover part 34 which are separate parts. The first cover portion 33 and the second cover portion 34 are each a plate-shaped component. The first cover portion 33 and the second cover portion 34 are stacked with a predetermined gap in the thickness direction. The first cover portion 33 is located above the second cover portion 34 . The first cover portion 33 covers the rear surface 21 f of the bus bar body 21 , that is, the surface on the side of the battery unit 4 , and supports the bus bar body 21 from below. The cylindrical portion 32 is integrally formed with the first cover portion 33 .

The second cover portion 34 covers the battery stack 11 from above, and is supported from below by the battery stack 11 . As shown in FIG. 6, the 2nd cover part 34 has the through-hole 34a. The through hole 34a penetrates through the second cover portion 34 in the plate thickness direction. The shape of the through-hole 34a in this embodiment is circular. The cylindrical portion 32 is formed integrally with at least the first cover portion 33 and protrudes downward from the first cover portion 33 . The outer diameter of the cylindrical portion 32 is smaller than the inner diameter of the through hole 34a. The cylindrical part 32 is arrange|positioned on the same axis as the through-hole 34a, and is inserted into the through-hole 34a from the upper side. The front end of the cylindrical portion 32 protrudes below the through hole 34a. The cylindrical portion 32 connects the upper space portion and the lower space portion of the protective member 3 . In addition, in FIG. 6 , a part of the cylindrical portion 32 is omitted, and the cylindrical portion 32 is actually inserted into each of the through holes 34 a.

The structure and the like of the battery connection module 1 will be further described with reference to the sectional views of FIGS. 7 and 8 . FIG. 7 shows the VII-VII section of FIG. 2 , and FIG. 8 shows the main part of FIG. 7 . As shown in FIGS. 7 and 8 , the connecting portion 22 of the bus bar 2 is accommodated in the cylindrical portion 32 in a state of being connected to the battery unit 4 . The cylindrical portion 32 accommodates a portion of the connection portion 22 protruding from the bus bar main body 21 toward the battery unit 4 , specifically, the second configuration portion 26 and the plate portion 23 . As shown in FIG. 8 , the plate portion 23 is fixed to the positive electrode 41 of the battery cell 4 . The protective member 3 is placed on the battery stack 11 so as to face the end surface 43 on the positive electrode 41 side of the battery cell 4 , and is fixed to the frame body 101 and the battery stack 11 . The front end 32 a of the cylindrical portion 32 abuts against the shoulder 42 of the battery unit 4 and is supported from below by the shoulder 42 . Also, the shoulder 42 of the battery cell 4 is a portion around the positive electrode 41 in the end surface 43 of the battery cell 4 on the positive electrode 41 side.

The bus bar body 21 of the bus bar 2 is supported from below by the first cover portion 33 of the protective member 3 . When the bus bar 2 and the protective member 3 are assembled in the battery stack 11 , the cylindrical housing space 36 is formed by the inner peripheral surface of the cylindrical portion 32 and the end surface 43 of the battery unit 4 . The connecting portion 22 of the bus bar 2 is accommodated in the accommodation space 36 . In other words, the connection portion 22 is surrounded from the side by the cylindrical portion 32 and is surrounded by the battery unit 4 from below. Therefore, the protection member 3 can restrict scattering of fragments (hereinafter referred to as “fuse pieces”) generated when the fuse portion 27 is blown. For example, flying of fuse chips to other battery cells 4 is restricted. Therefore, in the battery connection module 1 of the present embodiment, it is possible to suppress occurrence of troubles caused by fragments generated by fusing of the fuse portion 27 .

Moreover, the cylindrical part 32 is interposed between the battery unit 4 and the bus bar main body 21, and functions as a support member which supports the bus bar main body 21 from below. The cylindrical portion 32 resists vibration and external force, supports the bus bar main body 21 from the lower side, and restricts the bus bar main body 21 from approaching the battery unit 4 . Therefore, the cylindrical portion 32 maintains an appropriate insulation distance after the fuse portion 27 is fused, and it is possible to suppress occurrence of a shortage of the insulation distance.

(Blanking process)

Assembly of the battery connection module 1 will be described with reference to FIG. 9 . Regarding the bus bar 2, a punching process of forming the connecting portion 22 on the bus bar main body 21 is performed. In the punching step, the through-hole 21 a is punched out from the bus bar main body 21 by punching to form the connecting portion 22 . The punching process may be performed simultaneously with forming the bus bar main body 21 .

(bending process)

After the punching process is completed, a bending process of bending the connecting portion 22 of the bus bar 2 is performed. In the bending step, the second configuration portion 26 is bent so that the plate-like portion 23 protrudes from the bus bar main body 21 to one side in the thickness direction. FIG. 9 shows the bus bar 2 after performing the punching process and the bending process.

(Protection parts assembly process)

After the bending step is completed, a protective member assembling step of assembling the protective member 3 to the bus bar 2 is performed. In the protection member assembling step, the protection member 3 is assembled to the bus bar main body 21 from the rear surface 21f side as indicated by arrow Y1. In the battery connection module 1 of the present embodiment, one protective member 3 is assembled with respect to the plurality of bus bars 2 . The protection member 3 is fixed to the bus bar main body 21 so as to accommodate the connecting portion 22 inside the cylindrical portion 32 . The protection member 3 is fixed to the bus bar main body 21 by a known locking mechanism or the like.

(Cover assembly process)

After the protective member assembling process is completed, the cover assembling process is performed. The cover assembly step is a step of assembling the bus bar 2 and the protective member 3 to the cover 6 . The cover 6 has a function as a holding member for holding the bus bar 2 and the protective member 3 , and a function as a protective member for protecting the bus bar 2 and the protective member 3 from deformation, and the like. The cover 6 is formed of non-conductive synthetic resin or the like. As indicated by arrow Y2 , a busbar assembly obtained by combining a plurality of busbars 2 and protective members 3 is assembled to a cover 6 . The busbar assembly is assembled to the cover 6 from the surface 21g side of the busbar main body 21 . The protective member 3 is fixed to the cover 6 by a known lock mechanism or the like so as to sandwich the bus bar main body 21 between the cover 6 and the cover 6 . Not only the protection member 3 but also the busbar main body 21 may be fixed to the cover 6 by a known locking mechanism or the like. The cover 6 has a function of holding the bus bar 2 and the protective member 3 to improve conveyability, and a function of covering the bus bar 2 and the protective member 3 to protect it from impact.

(Battery connection module assembly process)

Through the cover assembly process, the battery connection module 1 of this embodiment is completed. In the battery connection module assembly process, the completed battery connection module 1 is assembled into the battery module 10 . In the battery connection module assembling process, the battery connection module 1 is placed on the battery module 10 , and the plate-like portion 23 is welded to the positive electrode 41 of the battery cell 4 . In addition, the battery connection module 1 is directly or indirectly fixed to the battery module 10 . As shown in FIG. 8, the cover 6 has an opening 6a. The opening portion 6 a is provided at a position corresponding to the connection portion 22 of the bus bar 2 . When the battery connection module 1 is assembled in the battery module 10 , the opening 6 a faces the connection part 22 and the positive electrode 41 of the battery cell 4 . The electrodes of the welding machine are inserted into the cylindrical portion 32 through the opening portion 6 a, and the plate-shaped portion 23 is welded to the battery cell 4 .

(Insulation cover assembly process)

After the battery connection module assembly process is completed, the insulating cover assembly process is performed. In the insulating cover assembly step, the insulating cover 7 is assembled to the battery module 10 . The insulating cover 7 may be fixed to the battery module 10 via the cover 6 or the like. The insulating cover 7 covers the conductive parts of the battery connection module 1 and the battery module 10 to prevent workers or tools from accidentally contacting the conductive parts. As shown in FIG. 8 , the insulating cover 7 closes the opening 6 a of the cover 6 from above, and covers the bus bar 2 and the conductive portion of the battery cell 4 .

In addition, in the battery connection module 1 of this embodiment, in the state before the battery connection module 1 is assembled in the battery module 10, that is, in the state of the independent battery connection module 1, the connection part 22 does not extend from the front end 32a of the cylindrical part 32. The exposed way constitutes. That is, the cylindrical portion 32 accommodates the connection portion 22 inside, thereby protecting the connection portion 22 . At this time, the plate-shaped portion 23 is located closer to the bus bar body 21 than the front end 32 a of the cylindrical portion 32 . Therefore, the plate-like portion 23 does not come into contact with other objects or workers during transportation and assembly.

As described above, the battery connection module 1 of the present embodiment has the bus bar 2 and the protection member 3 . The bus bar 2 has a plate-shaped bus bar main body 21 and a plurality of connection parts 22 . The connecting portion 22 is bent toward one side in the thickness direction of the bus bar body 21 with respect to the bus bar body 21 , and is connected to the battery unit 4 . A fuse portion 27 is provided between the bus bar main body 21 of the connection portion 22 and the battery unit 4 . The insulating protective member 3 is disposed between the bus bar main body 21 and the battery cells 4 , and has a plurality of cylindrical portions 32 . The cylindrical portion 32 surrounds the plurality of connecting portions 22 respectively. The battery connection module 1 according to the present embodiment has the cylindrical portion 32 surrounding the connection portion 22 , so that scattering of the fuse piece and poor conduction when the fuse portion 27 is blown can be suppressed.

In the state where the battery connection module 1 of this embodiment is assembled in the battery module 10 , the front end 32 a of the cylindrical portion 32 is closed by the end surface 43 of the battery cell 4 . In this embodiment, the front end 32 a of the cylindrical portion 32 is in contact with the end surface 43 of the battery cell 4 . As a result, the storage space 36 is formed in which at least the lower side is blocked. By accommodating the connecting portion 22 in the accommodating space 36, it is possible to more reliably suppress the scattering of the fuse chips. In addition, there may be a gap to the extent that a fuse chip cannot pass between the front end 32 a of the cylindrical portion 32 and the end surface 43 of the battery unit 4 . That is, the end surface 43 of the battery unit 4 does not need to completely close the front end 32a of the cylindrical portion 32, but only needs to close the front end 32a to such an extent that the flying of the fuse chip can be suppressed.

The cylindrical portion 32 is interposed between the battery unit 4 and the bus bar body 21 and supports the bus bar body 21 from below. Therefore, it is possible to suppress the occurrence of insufficient insulation distance when the fuse portion 27 is blown.

In the battery connection module 1 of this embodiment, the protective member 3 has the cover part 31 which connects the some cylindrical part 32 mutually, and covers the surface of the bus bar main body 21 by the battery cell 4 side. The cover portion 31 connects the adjacent cylindrical portions 32 and covers the back surface 21 f of the bus bar main body 21 . Thus, the cover portion 31 restricts the movement of the fuse chip generated in one cylindrical portion 32 to the other cylindrical portion 32 . From the viewpoint of suppressing the scattering of the fuse chips, it is preferable that the cover portion 31 is in contact with the rear surface 21f of the bus bar main body 21, or is close to the rear surface 21f to such an extent that passage of the fuse chips can be restricted.

The battery pack 100 of the present embodiment includes a plurality of battery cells 4 and the aforementioned battery connection module 1 . Therefore, in the battery pack 100 of the present embodiment, it is possible to suppress failures after the fuse section 27 is blown by suppressing scattering of the fuse pieces and the like.

The protection member 3 of the present embodiment has a plurality of insulating cylindrical portions 32 connected to each other in a state of being arranged in parallel. The plurality of cylindrical portions 32 respectively surround the plurality of connection portions 22 bent from the plate-shaped bus bar main body 21 to one side in the thickness direction and connected to the battery cells 4 . Therefore, the protective member 3 according to the present embodiment can suppress the trouble after the fuse part 27 is blown by suppressing the scattering of the fuse chip or the like.

[First Modification of Embodiment]

Next, a first modified example of the embodiment will be described. 10 is a plan view showing a main part of a bus bar according to a first modification example of the embodiment, and FIG. 11 is a plan view showing the bus bar according to the first modification example of the embodiment after a bending process. In the bus bar 2 of the first modified example, a point different from the above-described embodiment is that a coupling portion 28 is provided. The coupling portion 28 supports the connection portion 24 and suppresses deformation of the connection portion 22 .

The coupling part 28 couples a part of the connecting part 24 and the bus bar main body 21 . In the punching step of punching out the through-hole 21 a from the bus bar main body 21 to form the connection portion 22 , punching is performed so that the connection portion 28 remains. The coupling portion 28 of the present modified example couples the second constituent portion 26 and the third wall surface 21d in the longitudinal direction. More specifically, the connecting portion 28 connects a portion of the second configuration portion 26 on the side of the plate-like portion 23 with respect to the fuse portion 27 and the third wall surface 21d.

The connecting portion 28 is cut off until the bus bar 2 is assembled to the battery module 10 . The cutting process of cutting the coupling portion 28 is performed, for example, after the cover assembly process. In this case, the assembly work of the battery connection module 1 is performed in the following procedure, for example.

Punching process→protection part assembly process→cover assembly process→cutting process→bending process

That is, after the bus bar 2 is assembled to the cover 6, the connecting portion 28 is cut and the connecting portion 22 is bent. By cutting the connecting portion 28 in the cutting step, the third wall surface 21d and the second constituent portion 26 are separated. After the cutting step is performed, as shown in FIG. 11 , burrs 21 h and 26 c remain on the bus bar main body 21 and the second constituent portion 26 , respectively. After the cutting process is performed, a bending process is performed to bend the second configuration part 26 at the first bending part 26a and the second bending part 26b. Through the bending process, the plate-shaped portion 23 is brought into a state of protruding to one side in the thickness direction with respect to the bus bar main body 21 .

In addition, the cutting process and the bending process may be performed simultaneously with a welding process or in parallel with a welding process. In other words, the cutting process and the bending process can also be performed by workers or machines (assembly lines) that perform the welding process. In this case, it is difficult to deform the connecting portion 22 in the preceding process or during transportation. In addition, the welding step is a step of welding the plate-like portion 23 to the battery cell 4 and is included in the above-mentioned battery connection module assembly step.

In the case where the bending process is performed simultaneously with the welding process, for example, the connection part 22 is bent by pushing the connection part 22 toward the battery cell 4 by electrodes of a welding machine. In addition, a jig for bending the connecting portion 22 may be provided in the welding machine, and the bending process may be performed by this jig.

As described above, the method of manufacturing the battery connection module of the bus bar 2 in this modified example includes a punching process, a protective member assembly process, a cover assembly process, a cutting process, and a bending process. The punching process is to punch out the bus bar 2 having a plate-shaped bus bar body 21, and leave a connecting portion that connects a part between the base end and the front end of the connection portion 22 to the bus bar body 21 by the punching process. 28 to form the connecting portion 22 process. The protective member assembling step is performed after the punching step, and is a step of assembling the protective member 3 to the bus bar 2 . The cover assembly step is a step of assembling the bus bar 2 and the protective member 3 to the cover 6 .

The cutting step is performed after the protecting member assembling step, and is a step of cutting the connecting portion 28 . The cutting process is performed, for example, after the cover assembling process. The bending step is performed after the cutting step, and is a step of bending the connecting portion 22 toward one side in the thickness direction of the bus bar body 21 .

According to the manufacturing method of the battery connection module of this modification, the connection part 22 is supported by the connection part 28 until the cutting process is performed, and deformation|transformation of the connection part 22 can be suppressed. Therefore, the connecting portion 22 can be protected from deformation during the protection component assembly process and the cap assembly process and during transportation between these two processes.

In addition, in the bus bar 2 of the present modified example, the coupling portion 28 is coupled to a portion of the second configuration portion 26 that is closer to the plate-shaped portion 23 than the fuse portion 27 . That is, the connection part 22 is coupled with the bus bar main body 21 at both sides of the fuse part 27 . Accordingly, the influence of vibration and external force can be alleviated for the fuse portion 27 having a small cross-sectional area, thereby suppressing deformation of the connection portion 22 . In addition, the coupling portion 28 is coupled to a position deviated from the fuse portion 27 . Accordingly, it is possible to suppress the cross-sectional area of the fuse portion 27 from deviating from a desired area due to the burr 26c.

[Second Modification of Embodiment]

A second modified example of the embodiment will be described. The shape, number, arrangement, etc. of the connecting portion 22 and the cylindrical portion 32 are not limited to those illustrated in the above-mentioned embodiment. For example, the connecting portion 22 may have a third constituent portion connecting the second constituent portion 26 and the plate-like portion 23 in addition to the first constituent portion 25 and the second constituent portion 26 . The third configuration portion extends, for example, from the front end of the second configuration portion 26 toward the first wall surface 21b. The fuse part 27 may be provided in the first configuration part 25 or the third configuration part instead of the second configuration part 26 .

The cross-sectional shape of the cylindrical portion 32 may be a polygon such as a rectangle instead of a circle. As an example, the cylindrical portion 32 may be formed in a honeycomb shape. Since the hexagonal cylindrical portion 32 has high strength, it can be thinned.

The contents disclosed in the above-mentioned embodiments and modifications can be combined appropriately and implemented.

Symbol Description

1 battery connection module

2 busbars

3 Protective parts

4 battery cells

5 Connection parts

6 covers

7 Insulation cover

10 battery modules

11 battery stack

21 Bus main body

21a Through hole

21b First wall

21c Second wall

21d third wall

21e fourth wall

21f back

21g surface

22 Connecting part

23 plate-shaped part

23a protrusion

24 link

25 First Component

26 Second Component

27 Fuses

28 joint

31 Hood

32 cylindrical part

32a front end

33 First cover part

34 Second cover part

34a Through hole

41 Positive

42 shoulders

43 end faces

100 battery pack

101 frame

Claims (6)

1. A battery connection module, characterized in that it has: A bus bar, which has a bus bar body and a plurality of connection parts that are bent toward one side in the thickness direction relative to the bus bar body and are respectively connected to the battery cells, and the bus bar body and the battery cells at the connection parts There is a fuse part between them, and a plurality of said battery cells are electrically connected; The insulating protection member is disposed between the bus bar main body and the battery cells, and has a plurality of cylindrical portions respectively surrounding the plurality of connection portions. 2. The battery connection module of claim 1, wherein: In a state where the battery connection module is assembled to the battery unit, the front end of the cylindrical portion is closed by the end surface of the battery unit. 3. The battery connection module according to claim 1 or 2, wherein, The protection member has a cover portion that connects the plurality of cylindrical portions to each other and covers a surface of the bus bar main body on the side of the battery cell. 4. A method for manufacturing a battery connection module, manufacturing the battery connection module according to any one of claims 1 to 3, characterized in that it comprises: a punching process of punching the bus bar, and forming the bus bar main body in such a manner that a part between the base end and the front end of the connection part is left by the punching process. connecting part; a protection component assembling process, which is performed after the punching process, and assembles the protection component to the bus bar; a cutting process, which is performed after the protective member assembling process, and cuts off the coupling portion; The bending step is performed after the cutting step, and bends the connecting portion toward one side in the thickness direction of the bus bar main body. 5. A battery pack, characterized in that it has: multiple battery cells; A bus bar having a bus bar main body and a plurality of connecting parts bent from the bus bar main body to one side in the thickness direction and respectively connected to the battery cells, and the bus bar main body and the battery cells at the connecting parts Fusible parts are provided between the units, and a plurality of the battery units are electrically connected; The insulating protection member is disposed between the bus bar main body and the battery cells, and has a plurality of cylindrical portions respectively surrounding the plurality of connection portions. 6. A protective component characterized in that, Equipped with a plurality of insulating cylindrical parts connected to each other in a parallel arrangement state, The plurality of cylindrical portions each surround a plurality of connection portions bent from the bus bar body to one side in the thickness direction and connected to the respective battery cells.