TWI707619B - Battery module having conductive sheets with a plurality of sections - Google Patents

Abstract

A battery module includes a plurality of battery cells, a circuit board and a conductive sheet. The conductive sheet is integrally formed and includes a first section, a second section, a third section and a fourth section. The first section is connected to the battery cells. The first end of the second section is connected to the first section. The third section is connected between the second end of the second section and the circuit board. The fourth section extends from the third end of the second section such that heat generated by the second section can be dissipated from the fourth section.

Description

Battery module with conductive sheet forming multiple sections

The present invention relates to a conductive sheet and a battery module, in particular to a high-temperature resistant conductive sheet and a battery module containing the aforementioned conductive sheet.

Figure 1 shows an exploded view of a battery module in the prior art. As shown in FIG. 1, the battery module 120 includes a plurality of cylindrical battery cells 121, at least one cell holder 123 and a plurality of conductive sheets 124. The brackets 123 define a plurality of battery accommodating spaces for placing and fixing the battery cells 121, and the battery cells 121 are respectively stacked in the longitudinal direction x and the width direction z of the brackets 123. The conductive sheets 124 are respectively disposed on two ends of the battery cell 121 to connect the battery cells 121 in parallel or in series to form a plurality of battery cell arrays. The conductive sheets 124 are welded to each battery cell 121 by welding to achieve the functions of series and parallel connection. The battery module 120 further includes a circuit board 126. The circuit board 126 may be a BMS control board. Various functional chips 127 are formed on the circuit board 126. The at least one bracket 123 further defines an accommodating space for accommodating the circuit board 126. The conductive sheets 124 of the final positive electrode or negative electrode located at both ends of the battery module 120 are fastened to the circuit board 126 by screws 125, and the circuit board 126 is also fastened to the bracket 123 by screws 125. The circuit board 126 is provided with a plurality of electrical connectors.

Figure 2 shows a perspective view of a conductive sheet in the prior art. As shown in FIG. 2, in the conductive sheet 124, the first section 151 and the second section 152 are connected by a first bending portion 156, and the second section 152 and the third section 153 are connected by a second bending portion. The folded portion 157 is connected.

As the system's demand for high power increases, the current value carried by the battery module 120 also increases. Traditional cylindrical lithium battery modules use conductive sheets 124 spot-welded to the positive and negative end faces of the battery cell 121. Due to the limited current that the battery cell 121 can withstand during spot welding, the general conductive sheet 124 can only be used with a thickness of 0.2mm The nickel sheet not only does not carry a high current value, but also easily generates high temperature.

The existing solutions are classified into three categories as follows: 1. The use of additional heat dissipation design such as a heat conducting plate is not only limited in effect but also high in cost. 2. The use of additional conductive designs such as welding circuit boards or riveting highly conductive materials is not only cumbersome and costly. 3. The use of highly conductive materials with different shunt slot designs to improve the effective shunt of spot welding, not only has a limited effect but also reduces the current diversion space of the conductive sheet 124. Therefore, how to increase the current value that the battery module conductive sheet 124 can carry, simplify the manufacturing process and reduce the cost, is a problem worthy of discussion at present.

An object of one embodiment of the present invention is to provide a battery module with conductive sheets forming multiple segments, which can increase the current value that the conductive sheets of the battery module can carry, simplify the manufacturing process and reduce costs.

According to an embodiment of the present invention, a battery module includes a plurality of battery cells, a circuit board and a conductive sheet. The conductive sheet is integrally formed and includes a first section, a second section, a third section and a fourth section. The first section is connected to the battery cells. The second section includes a first end, a second end, and a third end, the third end is connected to the first end and the second end, and the first end of the second section is connected to the first area segment. The third section is connected between the second end of the second section and the circuit board. The fourth section is connected to the second section and extends from the third end of the second section, so that the heat generated by the second section can be dissipated from the fourth section.

In one embodiment, the conductive sheet further includes a fifth section connected to the fourth section. The fourth section extends from the third end of the second section along a first direction. Moreover, the fifth section extends from one end of the fourth section in a second direction, and dissipates heat generated by the second section through the fourth section, wherein the second direction Different from the first direction.

In one embodiment, the first direction and the second direction are both parallel to the surface of the second section.

In one embodiment, the second section further includes: a fourth end opposite to the third end, the fourth end connected to the first end and the second end, and the first end opposite to the second end end. The conductive sheet further includes: a fifth section connected to the fourth end of the second section. The fourth section extends along a third direction. Moreover, the fifth section extends from the fourth end of the second section along the third direction, so that the heat generated by the second section can be dissipated from the fifth section.

According to an embodiment of the present invention, a battery module includes a plurality of battery cells, a circuit board and a conductive sheet. The conductive sheet is integrally formed and includes a first section, a second section, a third section and a fourth section. The first section is connected to the battery cells. The second section includes a first end, a second end, and a third end, the third end is connected to the first end and the second end, and the first end of the second section is connected to the first area segment. The third section is connected between the second end of the second section and the circuit board. The fourth section is flatly attached to the second section and connected to the third end of the second section, thereby increasing the cross-sectional width or thickness of the current path between the first section and the third section.

In one embodiment, the third end of the second section is a third bending portion, and the fourth section and the second section are connected by the third bending portion. Preferably, the third bending portion is U-shaped.

In one embodiment, the second section further includes: a fourth end opposite to the third end, the fourth end connected to the first end and the second end, and the first end opposite to the first end Two ends. The conductive sheet further includes: a fifth section, flatly attached to the fourth section. The fourth end of the second section is a fourth bending portion, which is U-shaped, and the fourth section and the fifth section are connected by the fourth bending portion. The U-shaped opening direction of the fourth bending portion is perpendicular to the U-shaped opening direction of the third bending portion.

In one embodiment, the first end of the second section is a first bending portion, so that a predetermined angle is formed between the first section and the second section, and the second section The second end is a second bending portion, so that another predetermined angle is formed between the second section and the third section.

According to an embodiment of the present invention, heat dissipation fins are provided at local high temperatures, so the cross-sectional area for heat dissipation can be increased, the heat dissipation rate of the conductive fins is improved, and the phenomenon of high temperature overheating is avoided. According to another embodiment of the present invention, at a local high temperature, the cross-sectional width of the current flowing path is increased to reduce the impedance to reduce the self-heating of the conductive sheet and avoid the phenomenon of high temperature overheating.

120‧‧‧Battery Module

121‧‧‧Battery cell

123‧‧‧bracket

124‧‧‧Conductive sheet

125‧‧‧Be screwed

126‧‧‧Circuit board

127‧‧‧chip

151‧‧‧Section 1

152‧‧‧Second section

153‧‧‧Section 3

156‧‧‧First bending part

157‧‧‧Second bending part

300‧‧‧Battery Module

310‧‧‧Conductive sheet

311‧‧‧Section 1

312‧‧‧Second section

313‧‧‧Section 3

314‧‧‧Section 4

315‧‧‧Fifth Section

320‧‧‧Battery cell

321‧‧‧First bending part

322‧‧‧Second bending part

323‧‧‧First connection part

324‧‧‧Second connecting part

323a‧‧‧The third bending part

324a‧‧‧The fourth bending part

330‧‧‧Circuit board

410‧‧‧Conductive sheet

411‧‧‧First section

412‧‧‧Second section

413‧‧‧ and the third section

414‧‧‧Section 4

415‧‧‧Fifth Section

421‧‧‧First bending part

422‧‧‧Second bending part

423‧‧‧third bending part

424‧‧‧Fourth bending part

Figure 1 shows an exploded view of a battery module in the prior art.

Figure 2 shows a perspective view of a conductive sheet in the prior art.

FIG. 3 shows a perspective view of a conductive sheet according to an embodiment of the invention.

FIG. 4 shows a perspective view of a battery module according to an embodiment of the invention.

Fig. 5(A) shows a perspective view of a conductive sheet according to an embodiment of the present invention.

Fig. 5(B) shows an enlarged view of a part of the conductive sheet of the embodiment of Fig. 5(A).

Fig. 6 shows a perspective view of a conductive sheet according to an embodiment of the invention.

FIG. 3 shows a perspective view of a conductive sheet according to an embodiment of the invention. As shown in FIG. 3, according to an embodiment of the present invention, the conductive sheet 310 for spot welding can be a conductive sheet with a better conductivity for the spot welding process, such as a nickel sheet with a thickness of 0.2 mm. The conductive sheet 310 includes a first section 311, a second section 312, a third section 313, and a fourth section 314. In an implementation side, the conductive sheet 310 may further include a fifth section 315. The second section 312 includes a first end, a second end, and a third end, and is respectively formed as a first bending portion 321, a second bending portion 322 and a first connecting portion 323. In one implementation, the second section 312 may further include a fourth end formed as the second connecting portion 324. It should be understood that the present invention does not limit the shape of the conductive sheet 310, and more specifically does not limit the shape of the second section 312. It can be a triangle, a quadrilateral, a polygon, etc., and various shapes can be designed according to different products. The first section 311 and the second section 312 are connected by a first bending portion 321, and the first section 311 and the second section 312 form a predetermined angle, preferably 90 degrees. Moreover, the second section 312 and the third section 313 are connected by a second bending portion 322, and the second section 312 and the third section 313 form another predetermined angle, preferably 90 degrees.

The first end and the second end of the second section 312 both extend in the first direction x and are opposite to each other, and the third end and the fourth end of the second section 312 both extend in the second direction z and are opposite to each other. The third end and the fourth end of the second section 312 are respectively connected between the first end and the second end of the second section 312. The fourth section 314 and the second section 312 are connected by a first connecting portion 323, and the fourth section 314 extends from the third end of the second section 312 along the first direction x. The fourth section 314 and the fifth section 315 are connected by a second connecting portion 324, and the fifth section 315 extends from one end of the fourth section 314 in the second direction z.

Please refer to the structure of the prior art in FIG. 2 again. The first section 151 is used for contacting and electrically connecting the battery cell 121, so the heat generated by the first section 151 can be assisted by the battery cell 121 to dissipate heat. The third section 153 is used for contacting and electrically connecting the circuit board 126, so the heat generated by the third section 153 can be assisted in heat dissipation through the circuit board 126. The second section 152 does not touch any device, so the second section 152 is prone to high temperature and heat.

Compared with the prior art, as shown in FIG. 3, in an embodiment of the present invention, the fourth section 314 and the fifth section 315 can be used as heat dissipation fins, so the conductive sheet 310 has a conductive heat dissipation fin structure design It is possible to increase the cross-sectional area for heat dissipation of the conductive sheet 310 at a local high temperature (specifically, the second section 312), so as to increase the heat dissipation rate of the conductive sheet 310 and avoid high temperature and overheating. Since the conductive heat dissipation fins (that is, the fourth section 314 and the fifth section 315) and part of the main body of the conductive sheet 310 (the second section 312) are integrally formed, the electrical conductivity/thermal conductivity is good, and the manufacturing process can be simplified. cut costs. Preferably, the conductive sheet 310 is integrally formed.

FIG. 4 shows a perspective view of a battery module according to an embodiment of the invention. As shown in FIG. 4, the battery module 300 includes a conductive sheet 310, a plurality of battery cells 320 and a circuit board 330. The first section 311 of the conductive sheet 310 is in contact with the battery cells 320, and the third section 313 of the conductive sheet 310 is in contact with the circuit board 330. Therefore, the first section 311 and the third section 313 can pass through the battery cells 320. And the circuit board 330 for heat dissipation, and the second section 312 can conduct heat dissipation through the fourth section 314 and the fifth section 315. According to this design, the temperature of the second section 312 is lower than that of the conventional technology.

In an embodiment, the long axis direction of the first section 311 extends along the arrangement direction of the battery cells 320. In this embodiment, the long axis direction of the first section 311 and the arrangement direction of the battery cells 320 both extend toward the third direction y. In one embodiment, the second section 312 extends toward the long axis direction of the battery cells 320, and the third section 313 extends toward the arrangement direction of the battery cells 320. In this embodiment, the second section 312 extends toward the second direction z, and the third section 313 extends toward the third direction y.

Fig. 5(A) shows a perspective view of a conductive sheet according to an embodiment of the present invention. Fig. 5(B) shows an enlarged view of a part of the conductive sheet of the embodiment of Fig. 5(A). The embodiment of FIG. 5(A) is a modification of the embodiment of FIG. 3, so the same elements use the same symbols, and related descriptions are omitted. As shown in FIGS. 5(A) and 5(B), the conductive sheet 310a includes a first section 311, a second section 312, a third section 313, a fourth section 314, and a fifth section 315. The second section 312 includes a first end, a second end, and a third end, and is respectively formed as a first bending portion 321, a second bending portion 322, and a third bending portion 323a. Moreover, a fourth bending portion 324a is formed between the fourth section 314 and the fifth section 315. The fourth section 314 is flat on the second section 312, and the fourth section 314 and the second section 312 are connected by a third bending portion 323a. The fifth section 315 is flat on the fourth section 314, and the fourth section 314 and the fifth section 315 are connected by a fourth bending portion 324a. The long axis direction of the first bending portion 321 is parallel to the long axis direction of the fourth bending portion 324a, and the long axis direction of the fourth bending portion 324a is not parallel to the long axis direction of the third bending portion 323a. Preferably, the long axis direction of the fourth bending portion 324a is perpendicular to the long axis direction of the third bending portion 323a.

In one embodiment, the third bending portion 323a and the fourth bending portion 324a are U-shaped with an opening. Preferably, the U-shaped opening direction of the fourth bending portion 324a is perpendicular to the first The U-shaped opening direction of the three-folded portion 323a.

In one embodiment, the impedance can also be reduced. More specifically, the fourth section 314 is tightly fitted or closely attached to the second section 312, and preferably the fifth section 315 is also tightly fitted or tightly attached to the fourth section 314, so the second section is bent The thickness of the nickel sheet between the section 312 (or between the first section 311 and the third section 313) increases plus. According to the conventional technology, in the high-power battery module, the thickness of the nickel sheet in the past is the same, but the nickel sheet between the second section 312 (or between the first section 311 and the third section 313) is the main current At the outlet, when all current passes through the second section 312 (or between the first section 311 and the third section 313), heat will be generated due to the resistance of the nickel sheet. In this embodiment, through the features of bending and tight fitting, the thickness between the second section 312 (or between the first section 311 and the third section 313) is increased, so that the impedance is reduced, the heat source is reduced, and the thickness is increased. The heat dissipation effect.

As described above, the conductive heat dissipation fin structure on the conductive sheet 310a can be a laminated design, and the conductive heat dissipation fins (the fourth section 314 and the fifth section 315) are folded back to make the conductive heat dissipation fins flat At a local high temperature of the conductive sheet 310a (the second section 312). More specifically, the fourth section 314 and the fifth section 315 are flat on the second section 312, and the first section 311 and the third section 313 can pass through the second section 312 and the fourth section 314. It is electrically connected to the fifth section 315. The thickness of the current path between the first section 311 and the third section 313 is three times that of the conventional technology. Therefore, according to this design, the cross-sectional width or thickness of the current flowing path between the first section 311 and the third section 313 can be increased, and the impedance between the first section 311 and the third section 313 can be reduced, thereby reducing the conduction. The part between the first section 311 and the third section 313 of the sheet 310a is self-heating. At the same time, due to the increase of the local cross-sectional area and thickness of the conductive sheet 310a, the heat dissipation rate of the conductive sheet is increased and the local heat capacity is increased to absorb heat, avoiding high temperature and overheating . In this embodiment, since the conductive heat dissipation fins and the main body of the conductive sheet are integrally formed, the electrical and thermal conductivity are good, and the manufacturing process can be simplified and the cost can be reduced.

In one embodiment, a fixing groove is formed on the bracket, and the battery case is fixed by the groove structure of the bracket. The conductive sheets 310 and 310a for spot welding during production can be placed on the bracket. In one embodiment In the bracket, there may be positioning pins passing through the positioning holes of the conductive sheets 310 and 310a for positioning, and then the spot welding process is performed.

Fig. 6 shows a perspective view of a conductive sheet according to an embodiment of the invention. As shown in FIG. 6, in one embodiment, the conductive sheet 410 includes a first section 411, a second section 412, a third section 413, a fourth section 414, and a fifth section 415. The second section 412 includes a first end, a second end, a third end, and a fourth end, and is respectively formed as a first bending portion 421, a second bending portion 422, and a third bending portion 423 And the fourth bending part 424. The first section 411 and the second section 412 are connected by a first bending portion 421, and the first section 411 and the second section 412 form a predetermined angle, preferably 90 degrees. Moreover, the second section 412 and the third section 413 are connected by a second bending portion 422, and the second section 412 and the third section 413 form another predetermined angle, preferably 90 degrees.

The first end and the second end of the second section 412 both extend in the first direction x and are opposite to each other, and the third end and the fourth end of the second section 412 both extend in the second direction z and are opposite to each other. The third end and the fourth end of the second section 412 are respectively connected between the first end and the second end of the second section 412. The fourth section 414 extends from the third end of the second section 412 along the third direction y, and the fourth section 414 and the second section 412 are connected by a third bending portion 423. The fifth section 415 extends from the fourth end of the second section 412 along the third direction y, and the fifth section 415 and the second section 412 are connected by a fourth bending portion 424.

In this embodiment, the fourth section 414 and the fifth section 415 can also be used as heat dissipation fins. Therefore, the conductive sheet 410 has a conductive heat dissipation fin structure design, which can be used in the conductive sheet 410 at a local high temperature. Specifically, the second section 412 increases the cross-sectional width of the path through which the current flows to reduce the impedance to reduce the self-heating of the conductive sheet 410. At the same time, the increase in the local cross-sectional area of the conductive sheet 410 increases the heat dissipation rate of the conductive sheet 410 and prevents Generate high temperature and overheat. Since the conductive heat dissipation fins and the main body of the conductive sheet are integrally formed, the electrical and thermal conductivity are good, and the manufacturing process can be simplified and the cost can be reduced.

In one embodiment, the conductive sheets 310, 310a, and 410 can be manufactured by a stamping process. In one embodiment, after the conductive sheet 310 is punched out in advance, the fourth section 314 and the fifth section 315 may be overlapped by punching to form the conductive sheet 310a.

From the viewpoint of manufacturing cost, and more specifically, from the viewpoint of reducing the amount of materials required for making the conductive sheet, the conductive sheet 310 or 310a of the embodiment of FIG. 3 or FIG. 5(A) is preferably used. Since the fourth section 314, 314a and the fifth section 315, 315a are formed on one side of the first section 311 and the second section 312, less material is removed by stamping, so the manufacturing cost can be reduced.

According to an embodiment of the present invention, the conductive sheet formed with multiple segments has the effect of better heat dissipation or low impedance and less heat generation. Compared with the prior art, it can improve the conductivity of the battery modules 300 and 400 The current value that the sheets 310, 310a and 410 can carry, and by increasing the local cross-sectional area and thickness of the conductive sheets 310 and 410 or increasing the heat dissipation area, the heat dissipation rate of the conductive sheets 310, 310a and 410 is improved and the local heat capacity is increased. Absorb heat to avoid high temperature and overheating. And can simplify the manufacturing process and reduce costs.

310‧‧‧Conductive sheet

311‧‧‧Section 1

312‧‧‧Second section

313‧‧‧Section 3

314‧‧‧Section 4

315‧‧‧Fifth Section

321‧‧‧First bending part

322‧‧‧Second bending part

323‧‧‧First connection part

324‧‧‧Second connecting part

Claims (8)

A battery module includes: a plurality of battery cells; a circuit board; and a conductive sheet, which is an integrally formed structure, including: a first section connected to the battery cells; and a second section including a A first end, a second end, and a third end, the third end is connected to the first end and the second end, and the first end of the second section is connected to the first section; The third section is connected between the second end of the second section and the circuit board; and a fourth section is connected to the second section, and the fourth section is from the second section The third end of the second section extends out, so that the heat generated by the second section can be dissipated from the fourth section, wherein the conductive sheet further includes: a fifth section connected to the fourth section Section, the fourth section extends from the third end of the second section in a first direction, and the fifth section extends from one end of the fourth section in a second direction, And the heat generated in the second section is dissipated through the fourth section, wherein the second direction is different from the first direction. The battery module according to claim 1, wherein the first direction and the second direction are both parallel to the surface of the second section. A battery module includes: a plurality of battery cells; a circuit board; and A conductive sheet is an integrally formed structure, including: a first section connected to the battery cells; a second section including a first end, a second end and a third end, the third End is connected to the first end and the second end, and the first end of the second section is connected to the first section; a third section is connected to the second end of the second section And the circuit board; and a fourth section, connected to the second section, the fourth section extends from the third end of the second section, so that the second section The generated heat can be dissipated from the fourth section, wherein the second section further includes: a fourth end is disposed relative to the third end, and the fourth end is connected to the first end and the second end , And the first end is disposed opposite to the second end, the conductive sheet further includes: a fifth section connected to the fourth end of the second section, the fourth section extending along a third direction And the fifth section extends from the fourth end of the second section along the third direction, so that the heat generated by the second section can be dissipated from the fifth section. The battery module according to any one of claims 1 to 3, wherein the first end of the second section is a first bending portion, so that the first section and the second section are It is at a predetermined angle, and the second end of the second section is a second bent portion, so that the second section and the third section are at another predetermined angle. A battery module includes: a plurality of battery cells; a circuit board; and a conductive sheet, arranged in an integrally formed structure, including: A first section is connected to the battery cells; a second section includes a first end, a second end and a third end, the third end is connected to the first end and the second end , And the first end of the second section is connected to the first section; a third section is connected between the second end of the second section and the circuit board; and a fourth section Section, overlapping the second section and connected to the third end of the second section, thereby increasing the cross-sectional width or thickness of the current path between the first section and the third section, wherein the first section The third end of the two sections is a third bending portion, and the fourth section and the second section are connected by the third bending portion, and the second section of the conductive sheet is punched out. After the section and the fourth section, the fourth section is overlapped by stamping. The battery module according to claim 5, wherein the third bending portion is U-shaped. A battery module includes: a plurality of battery cells; a circuit board; and a conductive sheet, arranged in an integrally formed structure, including: a first section connected to the battery cells; a second section including A first end, a second end and a third end, the third end is connected to the first end and the second end, and the first end of the second section is connected to the first section; A third section connected between the second end of the second section and the circuit board; and a fourth section overlapping the second section and connected to the first section of the second section Three ends to increase the cross-sectional width or thickness of the current path between the first section and the third section Degree, wherein the third end of the second section is a third bending portion, and the fourth section and the second section are connected by the third bending portion, and the third bending Portion is U-shaped, and the second section further includes: a fourth end is disposed opposite to the third end, the fourth end is connected to the first end and the second end, and the first end is opposite to the first end. At two ends, the conductive sheet further includes: a fifth section overlapping with the fourth section, the fourth end of the second section is a fourth bending portion, and the fourth bending portion is U-shaped And the fourth section and the fifth section are connected by the fourth bending portion, and the U-shaped opening direction of the fourth bending portion is perpendicular to the U-shaped opening direction of the third bending portion. The battery module according to any one of claims 5 to 7, wherein the first end of the second section is a first bent portion, so that the gap between the first section and the second section It is at a predetermined angle, and the second end of the second section is a second bent portion, so that the second section and the third section are at another predetermined angle.

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