CN218548557U - Battery module with heat dissipation structure - Google Patents

Abstract

The utility model discloses a battery module with heat dissipation structure, battery module is including a plurality of battery cores, battery mount and heat dissipation structure. The battery fixing frame is used for accommodating and fixing the battery core. The heat dissipation structure includes at least one metal plate and at least one heat conductor. The metal plate is disposed in the gaps of the plurality of battery cells. The heat conductors are disposed on both left and right sides of the metal plate, and are elastic members. When the metal plate is arranged in the gaps of the battery cells, part of the heat conductor is pressed by the metal plate and the battery cells to be tightly attached to the battery cells. When the battery core charges and discharges, the heat generated by the battery core charges and discharges is conducted to the metal plate through the heat conductor, and then the heat generated by the battery core charges and discharges is taken away through the metal plate.

Description

Battery module with heat dissipation structure

Technical Field

The present invention relates to a battery module, and more particularly to a battery module using a heat dissipation structure to remove heat generated by charging and discharging a battery cell and to dissipate heat.

Background

Fig. 1, 2 and 3 are cross-sectional top, front and side views of a battery module in the prior art. As shown in fig. 1, 2, and 3, the battery module 100 includes a case 11, a plurality of battery cells 12, and a battery holder 13. The battery holder 13 includes a first holder 131 and a second holder 132. The battery cells 12 are accommodated and fixed between the first fixing frame 131 and the second fixing frame 132, and the first fixing frame 131 and the second fixing frame 132 in which the battery cells 12 are arranged in the housing 11, so that the battery cells 12 and the first fixing frame 131 and the second fixing frame 132 are protected by the housing 11.

When the battery cells 12 of the battery module 100 are charged and discharged, heat is generated and the temperature rises. In order to dissipate heat generated by charging and discharging of the battery cell 12, an air blowing fan 151 and an air suction fan 153 are generally provided on both sides of the case 11. The first and second holders 131 and 132, which house the battery cells 12, are placed between the blowing fan 151 and the suction fan 153. The blowing fan 151 blows the cool air from the outside toward the position of the battery cell 12 inside the case 11, and the blown cool air passes through the heat-generating battery cell 12 and becomes hot air. Then, the hot air is extracted by the extraction fan 153 to be discharged to the outside, and the temperature of the battery cell 12, which is expected to generate heat by charging and discharging, can be lowered by blowing air by the blowing fan 151 and extracting the hot air by the extraction fan 153.

When the battery cells 12 of the battery module 100 are charged and discharged, the center of the can body of the battery cell 12 is the hottest point of the entire battery cell 12. Furthermore, the battery cells 12 are generally arranged in a parallel arrangement in the battery holder 13. The hottest point of the battery cell 12 will be located in the very center of the battery holder 13. In other words, when the battery cells 12 are placed in the parallel arrangement in the battery holder 13, the hottest point of the battery cell 12 will correspond exactly to the hottest point of the adjacent battery cell 12. Then, when the battery cell 12 is at the same temperature as the adjacent battery cell 12, the battery cell 12 will be in an equivalent adiabatic state, and the heat source at the hottest point of the battery cell 12 will not be distributed to the adjacent battery cell 12. The battery holder 13 is usually made of plastic, and the thermal conductivity of the battery core 12 cannot be conducted by the battery holder 13 itself because the thermal conductivity of the plastic itself is very poor.

The plurality of battery cells 12 are arranged in parallel in a substantially equal height in the elongated battery holder 13. Therefore, most of the wind power of the cool air blown by the blowing fan 151 is blocked by the front row of battery cells 12 close to the blowing fan 151 to cause a phenomenon of high flow resistance, and only a small amount of wind power can flow to the rear row of battery cells 12 through the gaps between the front row of battery cells 12. Therefore, the heat of the rear battery cells 12, which are farther from the air blowing fan, is not easily taken out efficiently.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a battery module with heat dissipation structure, including a plurality of battery cores, battery mount and heat dissipation structure. The battery fixing frame is used for accommodating and fixing the battery core. The heat dissipation structure includes at least one metal plate and at least one heat conductor. The metal plate is disposed in the gaps of the plurality of battery cells. The heat conductors are disposed on the left and right sides of the metal plate and are elastic members. When the metal plate is disposed in the gaps of the plurality of battery cells, the heat conductor will contact the outer side surface of the center of the can body of those battery cells, and part of the structure of the heat conductor will be pressed by the metal plate and those battery cells. The part of the structure of the compressed heat conductor will form a larger area of the contact surface with the battery cell. Thus, by providing the heat conductor, there will be a relatively large area of contact surface between the metal plate and the battery cell. When the battery core charges and discharges, the heat conductor absorbs heat generated by charging and discharging of the battery core by utilizing the contact surface with a large area and conducts the absorbed heat to the metal plate, and then the metal plate can rapidly take away the heat from the battery core so as to avoid the battery core from operating at a high temperature state and further reduce the risk of damage to the battery core.

In order to achieve the above object, the present invention discloses a battery module with a heat dissipation structure, which is characterized in that, comprising: a metal housing; a plurality of battery cells; the battery fixing frame is used for accommodating and fixing the battery cores and arranged in the metal shell; the heat dissipation structure comprises at least one metal plate, a plurality of metal plates and a plurality of metal plates, wherein the metal plates are arranged in gaps of the plurality of battery cells or in gaps between the plurality of battery cells and the inner wall of the metal shell; and at least one heat conductor arranged on the left and right sides of the metal plate, wherein the heat conductor is an elastic member, and when the metal plate is arranged in the gaps of the battery cells or in the gaps of the battery cells and the inner wall of the metal shell, part of the heat conductor is pressed by the metal plate and the battery cells to be tightly attached to the battery cells.

Preferably, one side of the interior of the metal shell is provided with an air inlet, the other side of the interior of the metal shell is provided with an air outlet, and the battery fixing frame is arranged between the air inlet and the air outlet.

Preferably, the metal plate is a long strip-shaped plate body, and two ends of the metal plate are respectively arranged towards the air inlet and the air outlet.

Preferably, in an embodiment of the present invention, one end of the metal plate penetrates out of the battery holder and is connected to the heat dissipation fins.

Preferably, in an embodiment of the present invention, the heat dissipation fins are disposed beside the air inlet or beside the air blowing port.

Preferably, in an embodiment of the present invention, the heat conductor is a heat conductive filler, a heat conductive pad, or a heat conductive adhesive tape.

Preferably, in an embodiment of the present invention, the battery holder includes a first holder and a second holder, the lower surface of the first holder includes at least a first positioning groove, the upper surface of the second holder includes at least a second positioning groove, the upper side of the metal plate is embedded in the first positioning groove of the first holder, and the lower side of the metal plate is embedded in the second positioning groove of the second holder.

Furthermore, the battery module with the heat dissipation structure further comprises a plurality of fixing pieces, at least one fixing hole is formed in the upper side and the lower side of the metal plate respectively, at least one first through hole is formed in the plate body of the first fixing frame, at least one second through hole is formed in the plate body of the second fixing frame, and each fixing piece penetrates through the corresponding first through hole in the first fixing frame or the corresponding second through hole in the second fixing frame and is fixed in the fixing hole of the metal plate respectively.

Preferably, the metal plate includes a first metal plate unit and two second metal plate units, the first metal plate unit is sandwiched between the two second metal plate units, the first metal plate unit includes a base, the plurality of battery cells are joined to the base of the first metal plate unit through a connector of the conductive connecting member and electrically connected together, the first metal plate unit and the second metal plate unit are members made of different metal materials, and the first metal plate unit and the conductive connecting member are members made of the same metal material.

Preferably, each battery cell is connected in series with another battery cell through a metal conductive frame, wherein the negative electrode of the battery cell is connected with the system device through a first wire, wherein the positive electrode of the battery cell is connected with the base of a metal plate through a connector of a conductive connecting piece, the metal plate is connected with the system device through a second wire, and discharge current flows from the system device to the battery cells connected in series and flows back to the system device through the metal plate.

Drawings

Fig. 1 is a top sectional view of a prior art battery module.

Fig. 2 is an elevational sectional view of a battery module in the related art.

Fig. 3 is a side sectional view of a battery module in the related art.

Fig. 4 is a top perspective view of an embodiment of the battery module of the present invention.

Fig. 5 is an exploded perspective view of a partial structure of an embodiment of the battery module according to the present invention.

Fig. 6 is a perspective assembly view of a partial structure of an embodiment of the battery module according to the present invention.

Fig. 7A is a schematic perspective view of an embodiment of the heat dissipation structure of the present invention.

Fig. 7B is a schematic front view of an embodiment of the heat dissipation structure of the present invention.

Fig. 8 is a schematic diagram of the heat conductor extruded by the metal plate and the battery cell according to the present invention.

Fig. 9 is a top perspective view of yet another embodiment of a battery module according to the present invention.

Fig. 10 is a perspective combination view of a partial structure of yet another embodiment of a battery module according to the present invention.

Fig. 11 is a top perspective view of yet another embodiment of a battery module according to the present invention.

Fig. 12 is a top perspective view of yet another embodiment of a battery module according to the present invention.

Fig. 13 is a perspective combination view of a partial structure of another embodiment of the battery module of the present invention.

Fig. 14 is a schematic circuit path diagram of the discharge current of the battery module according to the present invention.

Description of reference numerals: 100-a battery module; 11-a metal housing; 12-a battery cell; 13-a battery holder; 131-a first mount; 132-a second mount; 151-a blower fan; 153-an exhaust fan; 200-a battery module; 21-a metal housing; 211-air inlet; 212-a blowing fan; 213-air outlet; 214-an extraction fan; 22-a battery cell; 221-a first wire; 222-a second conductive line; 223-a conductive frame; 224-conductive connections; 2241-a connector; 23-a battery holder; 231-a first fixing frame; 2310-sleeve; 2311-a first positioning groove; 2312-first perforation; 232-a second fixing frame; 2320-sleeve; 2321-a second positioning groove; 2322-second perforation; 24-a heat dissipating construction; 241-a metal plate; 2410-fixing holes; 2411-a first metal plate unit; 2412-a second metal plate unit; 2413-a base; 242-a thermal conductor; 2421-contact surface; 25-a fixing member; 26-radiating fins; 300-system means.

Detailed Description

Please refer to fig. 4, fig. 5, fig. 6, fig. 7A and fig. 7B, which are a top perspective view, an exploded perspective view of a partial structure, a three-dimensional assembly view, a schematic perspective view and a front schematic view of a heat dissipation structure according to an embodiment of the present invention. As shown in fig. 4, 5 and 6, the battery module 200 of the present invention includes a metal housing 21, a plurality of battery cells 22, a battery holder 23 and at least one heat dissipation structure 24.

The battery holder 23 includes a first holder 231 and a second holder 232. The first fixing frame 231 includes a plurality of sleeves 2310, and the second fixing frame 232 includes a plurality of sleeves 2320. The upper end of each battery cell 22 is sleeved in the sleeve 2310 of the first fixing frame 231, and the lower end is sleeved in the sleeve 2320 of the second fixing frame 232, so that each battery cell 22 can be fixed between the first fixing frame 231 and the second fixing frame 232 and keep a gap therebetween. Furthermore, the battery holder 23 accommodating and fixing the battery cell 22 is disposed inside the metal housing 21, so as to protect the battery holder 23 and the battery cell 22 through the metal housing 21.

An air inlet 211 and an air outlet 213 are respectively disposed at two sides of the metal housing 21. In an embodiment, the air inlet 211 may also be provided with a blowing fan 212, and the air outlet 213 may also be provided with a suction fan 214. The battery holder 23 is disposed between the air inlet 211 and the air outlet 213, and blows air through the air inlet 211 by the blowing fan 212 and draws air through the air outlet 213 by the drawing fan 214, so that air can flow through the metal casing 21.

Each heat dissipation structure 24 includes a metal plate 241 and at least one heat conductor 242. The metal plate 241 is a long sheet-shaped metal plate body, such as an aluminum plate or a copper plate, and is disposed in the gap of the plurality of battery cells 22, for example, the metal plate 241 is disposed in the gap between one row of battery cells 22 and the other row of battery cells 22. In a preferred embodiment of the present invention, two ends of the metal plate 241 are respectively disposed facing the air inlet 211 and the air outlet 213, such as one end (front end) of the metal plate 241 facing the air inlet 211 and the other end (rear end) facing the air outlet 213. The thermal conductor 242 is an elastic member, such as a heat conductive filler (gap filter), a thermal pad or a thermal tape, and is disposed on the left and right sides (e.g., the sides of the two long sides) of the metal plate 241 by bonding or pressing, as shown in fig. 7A and 7B.

The lower surface of the first fixing frame 231 includes at least one first positioning slot 2311, and the upper surface of the second fixing frame 232 includes at least one second positioning slot 2321. When the metal plate 241 is assembled with the first fixing frame 231 and the second fixing frame 232, the upper side of the metal plate 241 is embedded in the first positioning groove 2311 of the first fixing frame 231, and the lower side of the metal plate 241 is embedded in the second positioning groove 2321 of the second fixing frame 232. The metal plate 241 passes through the positioning grooves 2311, 2321 of the holders 231, 232 to be positioned in the battery holder 23.

Further, the battery module 200 further includes a plurality of fixing members 25, such as screws, and at least one fixing hole 2410, such as a screw hole, is formed on each of the upper and lower sides of the metal plate 241. The plate of the first holder 231 has at least one first through hole 2312, and the plate of the second holder 232 has at least one second through hole 2322. Each fixing member 25 passes through the corresponding first through hole 2312 of the first fixing frame 231 or the corresponding second through hole 2322 of the second fixing frame 232 and is locked in the fixing hole 2410 of the metal plate 241. Then, the metal plate 241 is firmly positioned in the battery holder 23 by the locking between the fixing piece 25 and the fixing hole 2410.

When the metal plate 241 is disposed in the corresponding gap of the plurality of battery cells 22, part of the heat conductor 242 contacts the outer side surface of the center of the can of the battery cell 22, and is pressed by the metal plate 241 and the battery cell 22 to cling to the battery cell 22. As further illustrated in fig. 8, the thickness of the heat conductor 242 may be set to 2mm, and the distance between the battery cell 22 and the metal plate 241 is 1mm. When the metal plate 241 is disposed in the gap of the plurality of battery cells 22, the heat conductor 242 contacts the outer side surface of the can center of the battery cell 22, and part of the structure of the heat conductor 242 is pressed by the metal plate 241 and the battery cell 22 to a thickness of 1mm, and part of the structure of the pressed heat conductor 242 forms a contact surface 2421 having a larger area with the battery cell 22. The larger area of the contact surface 2421 will stick to the area of the battery cell 22 where heat is not easily dissipated (e.g. the area of the outer side of the center of the can of the battery cell 22).

Thus, with the provision of the thermal conductor 242, there will be a relatively large area of the contact surface 2421 between the metal plate 241 and the battery cell 22. When the battery cell 22 is charged or discharged, the heat conductor 242 absorbs heat generated by charging or discharging the battery cell 22 by using the large-area contact surface 2421 and conducts the absorbed heat to the metal plate 241. After receiving the heat generated by charging and discharging the battery core 22, the metal plate 241 transfers the heat to the end close to the air inlet 211 and having a lower temperature, so that the heat can be dissipated by the air blown by the blowing fan 212 at the air inlet 211. Therefore, the heat generated by charging and discharging the battery cells 22 located at the rear row of the air inlet 211 can be quickly removed through the heat dissipation structure 24, so as to prevent the battery cells 22 located at the rear row of the air inlet 211 from operating at a high temperature, thereby reducing the risk of damage to the battery cells 22.

As shown in fig. 9 and 10, in another embodiment of the present invention, one end (e.g., the front end) of the metal plate 241 protrudes from the battery holder 23 and is connected to the heat sink fins 26, and the heat sink fins 26 may also be fixed to one end of the metal plate 241 and disposed beside the air inlet 211 by a selected locking manner. Of course, in another embodiment of the present invention, the other end (e.g., the rear end) of the metal plate 241 may also protrude out of the battery holder 23 and be connected to another heat sink 26, and the heat sink 26 is locked on the other end of the metal plate 241 and is disposed beside the air outlet 213. Through the arrangement of the heat dissipating fins 26, the heat conducted by the metal plate 241 can be concentrated on the heat dissipating fins 26 and quickly dissipated by the air blowing fan 212 of the air inlet 211 or the air drawing fan 214 of the air outlet 213.

Fig. 11 is a top perspective view of another embodiment of the battery module of the present invention. As shown in fig. 11, the metal plate 241 of the present embodiment may be disposed in the gap between the plurality of battery cells 241 and the metal case 21, in addition to the gap between the plurality of battery cells 22. Then, the heat conducted on the metal plate 241 contacting the metal case 21 can be thermally dissipated on the metal case 21 or through the metal case 21.

Fig. 12, 13 and 14 are a top perspective view of another embodiment of the battery module, a partially constructed three-dimensional assembly view of another embodiment of the battery module, and a circuit path diagram of a discharging current of the battery module, respectively. As shown in fig. 12, 13 and 14, each battery cell 22 is connected in series with another battery cell 22 through a metal conductive frame 223. The negative electrode of the battery module 200 in which the battery cells 22 are connected to the system device 300 through the first wire 221, and the first metal plate unit 2412 is connected to the system device 300 through the second wire 222. The positive electrodes of the battery modules 200, in which the battery cells 22 are connected to the metal plates 241 through the conductive connection members 224.

Generally speaking, copper is much higher than the unit price of aluminum, and in order to reduce the cost of the heat dissipation structure, the metal plate 241 of the present invention is an aluminum plate as a preferred choice. In addition, copper has better conductivity than aluminum, and thus, the connection terminals (e.g., the conductive connecting members 224 and the metal frames 223) are usually mainly made of copper. The chemical property of aluminum is more active than that of copper, and if the conductive connecting member 224 made of copper is directly butted with the connecting member of the metal plate 241 made of aluminum, an electrochemical reaction occurs at the joint between the conductive connecting member 224 and the connecting member of the metal plate 241, and corrosion of the connecting member of the metal plate 241 occurs. When the connector of the metal plate 241 is corroded, contact resistance (contact resistance) at the joint between the conductive connector 224 and the connector of the metal plate 241 increases, and the resistance increases, thereby generating heat. Over time, the junction between the conductive connector 224 and the connector of the metal plate 241 is prone to dangerous conditions, even resulting in wire breakage.

In order to avoid direct butt joint between the copper connecting member and the aluminum connecting member, the metal plate 241 of the present invention is designed as a three-layer plate structure, which includes a first metal plate unit 2411 and two second metal plate units 2412. The first metal plate unit 2411 is sandwiched between two second metal plate units 2412. The first metal plate unit 2411 and the second metal plate unit 2412 are members made of different metal materials. For example: the first metal plate unit 2411 is a copper plate body, and the second metal plate unit 2412 is an aluminum plate body. Furthermore, the conductive connector 224 and the first metal plate unit 2411 are made of the same metal material, such as copper. Further, the conductive connector 224 includes a connector 2241, and the first sheet metal unit 2411 includes a base 2413. The conductive connector 224 and the first metal plate unit 2411 are engaged together by locking between the connector 2241 and the base 2413. In this way, the connector 2241 of the copper conductive connector 224 is engaged with the base 2413 of the first metal plate 2411 to prevent corrosion at the joint between the connector 2241 and the base 2413.

The utility model discloses first metal sheet unit 2411 is used for as the power conductor. When the system device 300 supplies the discharge current ID, the discharge current ID flows to the battery cells 22 of the battery module 200 via the first conductive line 221. The discharge current ID flows on the battery cells 22 connected in series via the metal conductive frame 223. After flowing through the battery cells 22 connected in series, the discharge current ID flows to the second metal plate unit 2412 via the conductive connection member 224. After flowing through the second metal plate unit 2412, the discharge current ID flows back from the second wire 222 to the system device 300. Then, the stability of the power supply loop of the battery module 200 can be increased by using the large-area second metal plate unit 2412 as a power supply conductor.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the scope of the invention, which is intended to be covered by the appended claims.

Claims (10)

1. A battery module with a heat dissipation structure, comprising:

a metal housing;

a plurality of battery cells;

the battery fixing frame is used for accommodating and fixing the plurality of battery cores and is arranged in the metal shell; and

the heat dissipation structure comprises:

at least one metal plate disposed in a gap between the plurality of battery cells or a gap between the plurality of battery cells and an inner wall of the metal case; and

and at least one heat conductor arranged on the left side and the right side of the metal plate, wherein the heat conductor is an elastic component, and when the metal plate is arranged in the gaps of the battery cells or in the gaps of the battery cells and the inner wall of the metal shell, part of the heat conductor is pressed by the metal plate and the battery cells to be tightly attached to the battery cells.

2. The battery module with the heat dissipation structure as recited in claim 1, wherein an air inlet is disposed at one side of the interior of the metal housing, and an air outlet is disposed at the other side of the interior of the metal housing, and the battery holder is disposed between the air inlet and the air outlet.

3. The battery module having a heat dissipation structure as set forth in claim 2, wherein the metal plate is an elongated sheet-like plate body, and both ends of the metal plate are respectively disposed facing the air inlet and the air outlet.

4. The battery module with the heat dissipation structure as set forth in claim 3, wherein one end of the metal plate protrudes from the battery holder and is connected with heat dissipation fins.

5. The battery module with the heat dissipation structure as set forth in claim 4, wherein the heat dissipation fins are disposed adjacent to the air inlet or the air outlet.

6. The battery module with the heat dissipation structure of claim 1, wherein the heat conductor is a thermally conductive filler, a thermally conductive pad, or a thermally conductive tape.

7. The battery module with the heat dissipation structure as recited in claim 1, wherein the battery holder includes a first holder and a second holder, a lower surface of the first holder includes at least a first positioning groove, an upper surface of the second holder includes at least a second positioning groove, an upper side of the metal plate is embedded in the first positioning groove of the first holder, and a lower side of the metal plate is embedded in the second positioning groove of the second holder.

8. The battery module with a heat dissipation structure as recited in claim 7, further comprising a plurality of fixing members, wherein the metal plate has at least one fixing hole on the top and bottom sides thereof, and the plate of the first fixing frame has at least one first through hole and the plate of the second fixing frame has at least one second through hole, and each fixing member passes through the corresponding first through hole of the first fixing frame or the corresponding second through hole of the second fixing frame and is fixed in the fixing hole of the metal plate.

9. The battery module with the heat dissipation structure as set forth in claim 1, wherein the metal plate includes a first metal plate unit and two second metal plate units, the first metal plate unit is sandwiched between the two second metal plate units, the first metal plate unit includes a base, the plurality of battery cells are electrically connected to the base of the first metal plate unit by being connected to the base through a connector of a conductive connecting member, the first metal plate unit and the two second metal plate units are members of different metal materials, and the first metal plate unit and the conductive connecting member are members of the same metal material.

10. The battery module with the heat dissipation structure as recited in claim 9, wherein each of the battery cells is connected in series to another battery cell by a metal conductive frame, wherein a negative electrode of one of the battery cells is connected to a system device by a first wire, a positive electrode of one of the battery cells is connected to the base of the metal plate by the connector of the conductive connector, the metal plate is connected to the system device by a second wire, and a discharge current flows from the system device to the plurality of battery cells connected in series and flows back to the system device through the metal plate.

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