TWM580807U - Battery module having a heater - Google Patents

Abstract

In a battery module, at least one bracket is used to fix the battery cells. A plurality of conductive sheets is respectively disposed at both ends of the battery cells. The heater covers the conductive sheets on at least one side of the battery module. The circuit board is electrically connected to the conductive sheets and the heater. When the circuit board detects that the temperature of the battery module is less than a predetermined value, the circuit board provides electricity to the heater to generate heat so as to heat the battery cells.

Description

Battery module with heater

The present invention relates to a battery module, and more particularly to a battery module having a heater.

Lithium-ion battery has the advantages of light weight, large specific capacity, long cycle life, etc. As a vehicle power source, it is not only lightweight and portable, but also helps the whole vehicle product to be compared with the lead-acid battery of the traditional power carrier. Lightweight and simple design. However, since lithium-ion batteries have fatal defects that cannot be charged below 0 degrees C, they are still not popular on the vehicle battery. The conventional lithium battery heating technology is nothing more than using a fan to bring the heat of the heater to the battery, so that the battery temperature is increased. For example, Japanese Patent Publication No. JP2006-0286508 uses a hot air generated by a fan heater to blow a battery module to achieve a heating function. However, because this method requires an extra fan, the cost will increase and additional power is required to be supplied to the fan. In addition, this heating method is also prone to uneven temperature rise due to the distance from the fan.

Another conventional technique is to use a liquid heating method to achieve a uniform temperature effect, for example, Chinese Publication No. CN106785185A, which discloses a liquid cooling and heating integrated power lithium battery module, but liquid The method of body heating causes a substantial increase in cost. The method of liquid heating requires additional water pumps, liquid flow chambers and the like, which makes the system more complicated and is not suitable for electric vehicles with simple structures such as electric bicycles. Furthermore, another conventional battery heating technique is in which the heating element is directly in contact with the battery in a manner that is difficult to achieve in the case of multiple strings and multiple, and is liable to cause uneven heating temperature of the same string, thereby causing a pressure difference of the same string of batteries. .

It is an object of an embodiment of the present invention to provide a battery module having a heater. Another object is to provide a battery module having a heater that, when it senses a low temperature of a plurality of cells, causes the heater to generate thermal energy to transfer thermal energy to the cells.

In one embodiment, a battery module includes a plurality of battery cells, at least one bracket, a plurality of conductive sheets, a heater, and a circuit board. At least one bracket is used to fix the battery cells. A plurality of conductive sheets are respectively disposed at both ends of the battery cells. The heater covers the conductive sheets on at least one side of the battery module. The circuit board is electrically connected to the conductive sheets and the heater, wherein when the circuit board detects that the temperature of the battery module is less than a predetermined value, power is supplied to the heater to generate heat, and the battery core is added temperature.

In one embodiment, the heater includes a first heating pad. The first heating pad includes a first insulating layer, a heating circuit and a second insulating layer, and the heating circuit is located between the first insulating layer and the second insulating layer. The heating circuit includes a plurality of connecting portions and a plurality of coils electrically connected to each other And a line width of each of the connecting portions is greater than a line width of each of the coil portions, and a position of each of the coil portions corresponds to a position of one end of each of the battery cells.

In one embodiment, the first insulating layer is adjacent to the conductive sheets and covers the conductive sheets compared to the second insulating layer. The first heating pad further includes a backing layer disposed on the inner side of the first insulating layer for bonding to the conductive sheets.

In one embodiment, the first heating pad further comprises a heat insulating layer, and the heat insulating layer is disposed on an outer side surface of the second insulating layer.

In one embodiment, the heater further includes a protection circuit and a plurality of wires, and the heating circuit, the wires and the protection circuit of the first heating pad form an uninterrupted conductive path.

In one embodiment, the heating circuit of the first heating pad has a first interruption point and a second interruption point, and the first interruption point and the second interruption point are separated by a predetermined distance. The protection circuit is disposed on an outer side of the first heating pad, and the first interruption point and the second interruption point are electrically connected to the protection circuit through the wires, thereby forming the conductive path without interruption. Preferably, the wires electrically connected to the protection circuit penetrate through the second insulation layer and are electrically connected to the first interruption point and the second interruption point.

In an embodiment, the heater further comprises: a second heating pad, a connector, and a plurality of wires line. The second heating pad has the same structure as the first heating pad, and the first heating pad and the second heating pad respectively cover the conductive sheets located on both sides of the battery module. The heating circuit and the electric wires of the first heating pad and the second heating pad form a non-interrupted conductive path. A first end and a second end of the conductive path are electrically connected to a first electrode and a second electrode of the connector, respectively, and are electrically connected to the circuit board through the connector.

In one embodiment, the coil portions of the heating circuit heat the battery cells via the conductive sheets. The area enclosed by each coil portion is not larger than the area of one end surface of each of the battery cells, and the position of each of the joint portions is for the position between two adjacent battery cells.

In one embodiment, the battery module further includes a power cord electrically connected to the circuit board and powered by the circuit board to generate heat to heat the battery cells.

According to an embodiment of the present invention, when the battery module senses a low temperature of the plurality of battery cells, after the heater generates thermal energy, the thermal energy is transmitted to the battery cells. In one embodiment, the high heat transfer characteristics of the conductive sheets allow the heating temperature rise of each of the battery cells to achieve a consistent function. In one embodiment, the heating circuit includes a plurality of connecting portions and a plurality of coil portions electrically connected to each other, wherein a line width of each of the connecting portions is greater than a line width of each of the coil portions, and positions of each of the coil portions respectively correspond to one The position of one end of the battery cell. In this way, thermal energy can be transmitted to the battery cells more efficiently.

120‧‧‧Battery module

121‧‧‧ battery core

123‧‧‧ bracket

124‧‧‧The conductive sheets

125‧‧‧heater

126‧‧‧ boards

127‧‧‧Power cord

251‧‧‧First heating mat

252‧‧‧second heating pad

253‧‧‧Connector

254‧‧‧Wire

254a‧‧‧Wire

254b‧‧‧Wire

255‧‧‧Protection circuit

257a‧‧‧First break point

257b‧‧‧second break point

351‧‧‧Insulation layer

352‧‧‧Second insulation

353‧‧‧heating circuit

354‧‧‧First insulation

355‧‧ ‧ adhesive layer

451‧‧‧Continuation Department

452‧‧‧ coil department

1 is a perspective view showing a battery module of an embodiment of the present invention.

2 is an exploded view of a battery module of an embodiment of the present invention.

Figure 3 is a cross-sectional view showing a first heating pad of a heater of an embodiment of the present invention.

4 is a schematic view showing a heating circuit of a first heating pad of a heater of an embodiment of the present invention.

Figure 5 is a schematic view showing the outer side of the first heating pad of the heater of the embodiment of the present invention.

1 is a perspective view showing a battery module of an embodiment of the present invention. 2 is an exploded view of a battery module of an embodiment of the present invention. As shown in FIGS. 1 and 2, the battery module 120 includes a plurality of cylindrical battery cells 121, at least one cell holder 123, a plurality of conductive sheets 124, and a heater 125. The brackets 123 define a plurality of battery accommodating spaces for placing and fixing the battery cores 121, and the battery cores 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 at two ends of the battery core 121 for forming the battery cells 121 in parallel or in series to form a plurality of battery core arrays. In one embodiment, the conductive sheets 124 are soldered to each of the battery cells 121 to achieve series and parallel connection. The heater 125 covers the conductive sheets 124 on at least one side of the battery module 120 for generating heat and conducting heat to the battery cores 121 to achieve the effect of warming the battery cores 121.

In the embodiment, the heater 125 includes a first heating pad 251 and a second heating pad 252. plus One side of the first heating pad 251 and the second heating pad 252 of the heater 125 respectively cover the conductive sheets 124 on both sides of the battery module 120 for generating heat and conducting heat to the battery cells 121 In order to achieve the effect of warming the battery cells 121. According to this design, the temperature difference between the batteries can be reduced at the same time to maintain good power supply efficiency and battery life. In one embodiment, the first heating pad 251 and the second heating pad 252 are adhered to the conductive sheets 124 to achieve the function of heating the battery.

In one embodiment, the battery module 120 includes a circuit board 126. The circuit board 126 can be a BMS control board including a cell temperature sensing device for achieving a cell temperature sensing function. 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 or negative electrodes located at both ends of the battery module 120 are screwed to the circuit board 126, and the circuit board 126 is also screwed to the bracket 123. A plurality of electrical connectors are provided on the circuit board 126. In one embodiment, the battery module 120 includes a power cord 127. The electrical connector at one end of the power cord 127 is fixed to an electrical connector of the circuit board 126 for electrical connection to the circuit board 126.

In one embodiment, the battery module 120 provides power to the heater 125 using the electrical energy of the battery cells 121 themselves, or the external power supply heater 125 is provided through the power line 127. Figure 3 is a cross-sectional view showing a first heating pad of a heater of an embodiment of the present invention. As shown in FIG. 3, in an embodiment, the first heating pad 251 of the heater 125 may be a multi-layer composite material. The first heating pad 251 includes a first insulating layer 354, a heating circuit 353, and a second insulation. Layer 352. The heating circuit 353 is located between the first insulating layer 354 and the second insulating layer 352, and the first insulating layer 354 is adjacent to and covers the conductive sheets 124. The second insulating layer 352 is farther away from the conductive sheets 124 than the first insulating layer 354. In an embodiment, the first heating pad 251 further includes a heat insulating layer 351. Insulation layer 351 The outer surface of the second insulating layer 352 is used for heat insulation to prevent heat generated by the first heating pad 251 from escaping to the external environment. In an embodiment, the first heating pad 251 further includes a backing layer 355. The adhesive layer 355 is disposed on the inner side surface of the first insulating layer 354 for adhering to the conductive sheets 124.

In an embodiment, the structure of the second heating pad 252 may be the same as that of the first heating pad 251. The heat insulating layer 351 of the first heating pad 251 and the second heating pad 252 is located between the battery cells 121, and can retain heat in the battery housing space defined by the brackets 123.

4 is a schematic view showing a heating circuit of a first heating pad of a heater of an embodiment of the present invention. Figure 5 is a schematic view showing the outer side of the first heating pad of the heater of the embodiment of the present invention. As shown in FIGS. 4 and 5, the heater 125 includes a first heating pad 251, a second heating pad 252, a connector 253, and a plurality of wires 254. The heating circuit 353 of the first heating pad 251 and the second heating pad 252, the wires 254 constitute an uninterrupted conductive path, and the first end and the second end of the conductive path (in this embodiment, respectively The end points of the two wires 254 are electrically connected to the first electrode and the second electrode of the connector 253, respectively, and are electrically connected to the circuit board 126 through the connector 253.

In one embodiment, the heater 125 further includes a protection circuit 255, and the heating circuit 353 of the first heating pad 251 and the second heating pad 252, the wires 254 and the protection circuit 255 constitute a non-interrupted conductive path. More specifically, as shown in FIG. 4, in the region S, the heating circuit 353 of the first heating pad 251 has a first interruption point 257a and a second interruption point 257b, a first interruption point 257a and a second interruption point. 257b is separated by a predetermined distance. As shown in FIG. 5, the protection circuit 255 is disposed on the outer side surface of the first heating pad 251, and the first interruption point 257a and the second interruption point 257b are respectively electrically connected. Connected to two wires 254 (254a and 254b), and the two wires 254 (254a and 254b) are electrically connected to the first and second poles of the protection circuit 255 to form a conductive path without interruption. In the present embodiment, the wires 254a and 254b penetrate through the second insulating layer 352 and are electrically connected to the first interruption point 257a and the second interruption point 257b of the heating circuit 353 of the first heating pad 251. In one embodiment, the location of the protection circuit 255 is such that no thermal insulation layer 351 is formed.

Referring to FIG. 4, the heating circuit 353 of the first heating pad 251 is divided into a connecting portion 451 and a coil portion 452, and the position of a coil portion 452 corresponds to the position of one end of a battery core 121. Preferably, the line width of the joint portion 451 is larger than the line width of the coil portion 452. Therefore, when heated, the heat generated by the coil portion 452 is high, and the heat generated by the joint portion 451 is low. Since the position of the connecting portion 451 corresponds to the position of the gap between the battery cells 121, and the position of the coil portion 452 corresponds to the position of one end of the battery core 121, most of the heat can be conducted to the battery cells 121. . Further, in order to achieve a good effect, it is preferable that the total length of one coil portion 452 is larger than the length of the joint portion 451. The enclosed area or the area of the coil portion 452 is not larger than the area of the electrode of the battery cell 121. In one embodiment, the position of the connecting portion 451 is for the position between the electrodes of the two adjacent battery cells 121, so that the heat dissipation and the heat use efficiency can be reduced.

According to an embodiment of the present invention, when the battery module 120 senses the low temperature of the plurality of battery cells 121, after the heaters 125 generate thermal energy, the thermal energy is transferred to the battery cells 121. In an embodiment, when the circuit board 126 (BMS control board) senses the low temperature of the battery cells 121, after the heater 125 generates thermal energy, the thermal energy is directly supplied to the conductive sheets 124, and then the conductive sheets are soldered. At 124, the heat energy is directly transmitted to the battery core 121, and in this way, a very low power can be used. The battery core 121 is rapidly heated, and the manufacturing method is simple and convenient, and has a cost advantage. In addition, the heating of the conductive sheet 124 can stably and consistently transfer the heat source to the body of the battery core 121, and the high heat conduction property of the conductive sheet 124 can make the heating temperature rise of each battery core 121 achieve a consistent function. The heat generation unevenness of the battery core 121 is reduced, thereby improving the service life of the battery module 120.

Claims (10)

A battery module comprising: a plurality of battery cells; at least one bracket for fixing the battery cells; a plurality of conductive sheets respectively disposed at two ends of the battery cells; and a heater covering at least the battery modules The conductive sheets on one side; and a circuit board electrically connected to the conductive sheets and the heater, wherein the circuit board supplies power to the heater when the temperature of the battery module is less than a predetermined value To generate heat, the cells are heated. The battery module of claim 1, wherein the heater comprises a first heating pad, the first heating pad comprises a first insulating layer, a heating circuit and a second insulating layer, and the heating circuit is located Between the first insulating layer and the second insulating layer, the heating circuit includes a plurality of connecting portions and a plurality of coil portions electrically connected to each other, and a line width of each of the connecting portions is greater than a line width of each of the coil portions And the position of each of the coil portions corresponds to the position of one end of each of the battery cells, respectively. The battery module of claim 2, wherein the first insulating layer is adjacent to the conductive sheets and covers the conductive sheets, and the first heating pad further comprises a backing The adhesive layer is disposed on the inner side surface of the first insulating layer for bonding to the conductive sheets. The battery module according to claim 3, wherein The first heating pad further comprises a heat insulating layer, and the heat insulating layer is disposed on an outer side surface of the second insulating layer. The battery module of claim 3 or 4, wherein the heater further comprises a protection circuit and a plurality of wires, and the heating circuit, the wires and the protection circuit of the first heating pad constitute a This conductive path is interrupted. The battery module of claim 5, wherein the heating circuit of the first heating pad has a first interruption point and a second interruption point, and the first interruption point and the second interruption point are separated by a predetermined distance. The protection circuit is disposed on an outer side surface of the first heating pad, and the first interruption point and the second interruption point are electrically connected to the protection circuit through the wires, thereby forming the conductive path without interruption. The battery module of claim 6, wherein the wires electrically connected to the protection circuit penetrate the second insulation layer and are electrically connected to the first interruption point and the second interruption point. The battery module of claim 2, wherein the heater further comprises: a second heating pad, a connector, and a plurality of wires, the second heating pad having the same structure as the first heating pad, The first heating pad and the second heating pad respectively cover the conductive sheets located on two sides of the battery module, the heating circuit of the first heating pad and the second heating pad, and the wires constitute a no An interrupted conductive path, and a first end and a second end of the conductive path are electrically connected to a first electrode and a second electrode of the connector, respectively, and are electrically connected to the circuit board through the connector. The battery module according to claim 2, wherein The coil portions of the heating circuit heat the battery cells via the conductive sheets, and the area enclosed by each of the coil portions is not more than the area of one end surface of each of the battery cells, and each The position of the splicing portion is for the position between two adjacent battery cells. The battery module according to claim 2, further comprising a power cord electrically connected to the circuit board, and supplying power to the heater via the circuit board to generate heat, and heating the battery cells.