TWM640874U - Battery case - Google Patents

Abstract

The present invention discloses a battery box, which includes a battery pack and at least one electric heating sheet. The battery unit is arranged in the heat conduction shell. A thermally conductive shell surrounds the thermally conductive shell. At least one electric heating sheet is in thermal contact with the heat conduction shell layer or the heat conduction shell.

Description

Battery case

The present invention is to provide a battery box, especially a battery box including an electric heating sheet.

Generally speaking, temperature is an important factor affecting the charging and discharging performance of the battery. Specifically, when the battery is in a low-temperature environment, the electrolyte in the battery will become viscous or even condensed, and the charging efficiency will decrease due to the restricted movement of ions in the electrolyte. When the battery is in a high temperature environment, the chemical balance in the battery will be destroyed and the service life of the battery will be reduced.

However, conventional batteries do not contain elements to control temperature. Therefore, it is difficult for conventional batteries to maintain a proper working temperature under different temperature environments, and there will be the above-mentioned problems of reduced charging efficiency or reduced service life. In view of this, it is currently necessary to develop a battery capable of temperature control to avoid the above-mentioned problems.

The present invention is to provide a battery case which can maintain a proper working temperature under different temperature environments.

A battery case disclosed in an embodiment of the present invention includes a battery pack and at least one electric heating sheet. The battery unit is arranged in the heat conduction shell. A thermally conductive shell surrounds the thermally conductive shell. At least one electric heating sheet is in thermal contact with the heat conduction shell layer or the heat conduction shell.

According to the battery case disclosed in the above embodiments, the electric heating sheet is in thermal contact with the Thermally conductive shell or thermally conductive shell. Therefore, when the temperature of the battery unit is too low, the battery unit can be heated by the electric heating plate. In addition, when the temperature of the battery unit is too high, the battery unit can be cooled through the heat conduction shell layer and the heat conduction shell. In this way, the battery units in the battery box can be maintained at an appropriate working temperature under different temperature environments, thereby preventing the efficiency of the battery units from being reduced.

10: Battery box

100: battery pack

110: heat conduction shell

111: shell side

120: battery unit

140: Bottom heat conducting bracket

1400: perforation

150: top heat conduction bracket

1500: perforation

180: thermal paste

200: heat conduction shell

201: shell side

202: Shell top surface

203: Shell bottom surface

210: side panel

211: inner surface

212: Groove

213: Groove bottom

220: top cover

230: Bottom cover

300: electric heater

301: heating surface

400: temperature sensor

500: controller

T: Thickness

D: Depth

G: Distance

W: width

S100,S200,S210,S220,S230,S240: steps

FIG. 1 is a schematic perspective view of a battery case according to an embodiment of the present invention.

FIG. 2 is an exploded schematic view of the battery box in FIG. 1 .

FIG. 3 is a schematic top view of the battery box in FIG. 1 omitting the top cover and the controller.

FIG. 4 is a flow chart of a method for controlling the temperature of a battery box according to an embodiment of the present invention.

The detailed features and advantages of the embodiments of the present invention are described in detail below in the implementation manner, the content is enough for anyone with ordinary knowledge in the field to understand the technical content of the embodiments of the present invention and implement them accordingly, and according to the disclosure of this specification Anyone with ordinary knowledge in the art can easily understand the purpose and advantages of the present invention. The following examples are to further describe the viewpoints of the present invention in detail, but do not limit the scope of the present invention in any way.

See Figures 1 through 3. FIG. 1 is a schematic perspective view of a battery case according to an embodiment of the present invention. FIG. 2 is an exploded schematic view of the battery box in FIG. 1 . FIG. 3 is a schematic top view of the battery box in FIG. 1 omitting the top cover and the controller. In this embodiment, the battery box 10 includes a battery pack 100, a heat conduction casing 200, a plurality of electric plus A heat chip 300 , a plurality of temperature sensors 400 and a controller 500 . The battery box 10 is, for example, a vehicle battery box.

In this embodiment, the battery pack 100 includes a heat conduction shell 110 , a plurality of battery cells 120 , a bottom heat conduction support 140 and a top heat conduction support 150 . The thermally conductive shell 110 surrounds the battery cells 120 . The bottom heat conduction support 140 and the top heat conduction support 150 are respectively disposed on opposite sides of the heat conduction shell 110 . The battery units 120 are respectively disposed in the plurality of through holes 1400 of the bottom heat conduction support 140 and the plurality of through holes 1500 of the top heat conduction support 150 . In addition, for example, a heat-conducting glue 180 is filled between the battery units 120 and the heat-conducting shell 110 . In this embodiment, the heat-conducting shell 110 has a plurality of shell side surfaces 111 facing away from the battery unit 120 . The shell sides 111 surround the battery cells 120 , for example.

In this embodiment, the heat conduction housing 200 includes a side plate 210 , a top cover 220 and a bottom cover 230 . In this embodiment, the heat conduction shell 200 is made of aluminum-copper alloy to improve the heat transfer efficiency of the heat conduction shell 200 . In addition, in this embodiment, the heat conduction shell layer 110 , the bottom heat conduction support 140 and the top heat conduction support 150 are also made of aluminum-copper alloy, for example. The top cover 220 and the bottom cover 230 are respectively disposed on opposite sides of the side plate 210 . The top cover 220 is located on a side of the top heat conduction bracket 150 away from the heat conduction shell 110 . The bottom cover 230 is located on a side of the bottom heat conduction bracket 140 away from the heat conduction shell 110 . In this embodiment, the heat conduction casing 200 has a plurality of casing side surfaces 201 facing away from the battery pack 100 , a casing top surface 202 and a casing bottom surface 203 . The casing top surface 202 and the casing bottom surface 203 are opposite to each other, and the casing side surfaces 201 are interposed between the casing top surface 202 and the casing bottom surface 203 . The housing top surface 202 is located on the top cover 220 . These housing sides 201 are located on the side panels 210. The housing bottom 203 is located on the bottom cover 230 . The housing sides 201 surround the heat-conducting shell 110 . In addition, in this embodiment, the side plate 210 further has an inner surface 211 and a plurality of grooves 212 . The inner surface 211 faces the shell sides 111 of the thermally conductive shell 110 and is in thermal contact with the shell sides 111 of the thermally conductive shell 110 . These grooves 212 are located on the inner surface 211 .

In this embodiment, the electric heating chips 300 are respectively located on the shell side surfaces 111 and separated from each other. In this embodiment, these electric heaters 300 are, for example, mica heaters. As shown in FIG. 3 , in this embodiment, the electric heaters 300 are respectively located in the grooves 212 , and opposite sides of each electric heater 300 are in thermal contact with the heat conduction shell 110 and the heat conduction shell 200 respectively. For the sake of brevity, only the connection relationship between one groove 212 and one electric heating chip 300 accommodated in the groove 212 will be described in detail below. In this embodiment, the electric heating chip 300 has two heating surfaces 301 facing away from each other. The thickness T of the electric heating chip 300 (ie, the distance between the two heating surfaces 301 ) is equal to the depth D of each groove 212 (ie, the distance between a groove bottom 213 and the inner surface 211 of the groove 212 ). Therefore, the two heating surfaces 301 of each electric heating chip 300 are in thermal contact with the shell side 111 of the heat conducting shell 110 and the groove bottom 213 of the groove 212 respectively. In addition, the electric heating chip 300 is, for example, welded to the bottom surface 213 of the groove 212 .

In this embodiment, the distance G between the plurality of electric heating chips 300 on the same shell side 111 is, for example, 0.5 to 5 times the width W of the electric heating chips 300 . When the battery case 10 is used in a lower temperature environment, the distance G between the electric heating sheets 300 can be shortened to increase the heating efficiency of the electric heating sheets 300; when the battery case 10 is used in a higher temperature environment, The distance G between the electric heating plates 300 can be added Longer to increase the cooling efficiency of the heat conduction shell 110 and the heat conduction shell 200 .

It should be noted that, in other embodiments, these electric heating chips can also be located only on one side of the shell. In other embodiments, the battery case may only include one electric heating sheet. In other embodiments, the electric heating sheet may only be in thermal contact with the heat-conducting shell, and transfer heat to the heat-conducting shell through an air gap between the heat-conducting shell and the heat-conducting shell. Alternatively, in other embodiments, the electric heating sheet may only be in thermal contact with the heat-conducting shell, and transfer heat to the heat-conducting shell through an air gap between the heat-conducting shell.

In other embodiments, the heat conduction shell does not need to have the groove 212 , and the electric heating plate is sandwiched between the inner surface of the heat conduction shell and the shell side of the heat conduction shell.

In this embodiment, a plurality of temperature sensors 400 are disposed on a side of the heat conduction shell 200 away from the heat conduction shell 110 . In detail, in this embodiment, the temperature sensors 400 are respectively located on the shell side 201 , the shell top 202 , and the shell bottom 203 of the heat conduction housing 200 , and surround the electric heating chips 300 . It should be noted that, in other embodiments, as long as the temperature sensor does not directly contact the electric heating plate, the temperature sensor can pass through the heat conduction shell and be partially interposed between the heat conduction shell and the battery pack.

It should be noted that in other embodiments, the battery box may only include one temperature sensor. In other embodiments, the temperature sensor can also be disposed on the heat conduction shell. In other embodiments, these temperature sensors do not need to be disposed on the top surface and the bottom surface of the casing, and are only located on the side of the casing respectively to surround the electric heating chips.

The controller 500 is electrically connected to these electric heating chips 300 and these temperature Degree sensor 400. The controller 500 is used for controlling the electric heaters 300 according to a plurality of temperature data measured by the temperature sensors 400 . For details, please refer to FIG. 4 , which is a flowchart of a method for controlling the temperature of a battery case according to an embodiment of the present invention. The battery box temperature control method includes the following steps.

First, proceed to step S100 , obtain a plurality of temperature data measured by the temperature sensors 400 at various positions of the battery box 10 through the controller 500 and average the temperature data to obtain an average temperature value.

Next, step S200 is performed, and the controller 500 determines whether the average temperature value is greater than the first temperature critical value. The first temperature critical value is, for example, room temperature (eg, 25 degrees Celsius). If the average temperature value is greater than the first temperature critical value, proceed to step S210 to determine whether the average temperature value is greater than a second temperature critical value higher than the first temperature critical value. If the average temperature value is less than the first temperature critical value, proceed to step S220 , and maintain the heat generated by the electric heating chips 300 through the controller 500 to maintain the power supplied to the electric heating chips 300 . If the average temperature value is greater than the first temperature critical value and smaller than the second temperature critical value, proceed to step S230 , by reducing the power supplied to the electric heating plates 300 through the controller 500 to reduce the heat generated by the electric heating plates 300 . If the average temperature value is greater than the second temperature critical value, proceed to step S240 , and turn off the electric heaters 300 through the controller 500 . The above is a two-stage control of the electric heater 300 through the first temperature threshold and the second temperature threshold. It should be noted that, whether in a low-temperature (high-latitude) environment or a high-temperature environment (low-latitude), the above-mentioned two-stage control can be performed on the electric heater 300 .

However, the present invention is not limited to two-stage heating of the electric heater 300 control. In other embodiments, regardless of whether it is in a low temperature (high latitude) environment or a high temperature environment (low latitude), the electric heater can be controlled in a one-stage manner, that is, only the first temperature threshold is used to control the electric heater. In such an embodiment, if it is judged that the average temperature value is greater than the first temperature critical value, the electric heater is directly turned off, and if it is judged that the average temperature value is lower than the first temperature critical value, the power supplied to the electric heater is maintained.

It should be noted that in other embodiments, the battery box does not need to include a controller, and the electric heaters are controlled by a controller outside the battery box according to the temperature data measured by the temperature sensors.

According to the battery box disclosed in the above embodiments, the electric heating sheet is in thermal contact with the heat-conducting shell layer or the heat-conducting shell. Therefore, when the temperature of the battery unit is too low, the battery unit can be heated by the electric heating sheet. In addition, when the temperature of the battery unit is too high, the battery unit can be cooled through the heat conduction shell layer and the heat conduction shell. In this way, the battery units in the battery box can be maintained at an appropriate working temperature under different temperature environments, thereby preventing the efficiency of the battery units from being reduced.

In addition, these electric heating chips are separated from each other. Therefore, the electric heating sheet can not only heat the battery unit when the temperature of the battery unit is too low, but when the temperature of the battery unit is too high and needs to be cooled, the heat on the heat-conducting shell or the heat-conducting shell can also pass through the separate electric heaters. The gap between the sheets escapes to the external environment.

In addition, since there are multiple electric heating sheets, each electric heating sheet can share the heat required for heating the battery unit. In this way, the heating temperature of a single electric heating chip can be reduced, thereby reducing the risk of damage to the electric heating chip due to high temperature. In addition, even if some of the electric heaters are damaged, the rest of the electric heaters that are not damaged Still functioning normally while heating.

Although the present invention is disclosed above with the above-mentioned embodiments, it is not intended to limit the present invention. Any person familiar with similar skills can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, this invention The scope of patent protection for new models shall be defined in the scope of patent application attached to this specification.

10: Battery box

100: battery pack

110: heat conduction shell

111: shell side

120: battery unit

140: Bottom heat conducting bracket

1400: perforation

150: top heat conduction bracket

1500: perforation

180: thermal paste

200: heat conduction shell

201: shell side

202: Shell top surface

203: Shell bottom surface

210: side panel

211: inner surface

212: Groove

213: Groove bottom

220: top cover

230: Bottom cover

300: electric heater

301: heating surface

400: temperature sensor

500: controller

Claims (10)

A battery box, comprising: a battery pack, including: a heat-conducting shell; and a plurality of battery cells arranged in the heat-conducting shell; a heat-conducting shell surrounding the heat-conducting shell; and at least one electric heating sheet, thermally contacted on the thermally conductive shell or the thermally conductive shell. The battery box according to claim 1, wherein the at least one electric heating sheet is plural in number, and the electric heating sheets are separated from each other. The battery box according to claim 2, wherein opposite sides of each of the electric heating sheets are in thermal contact with the heat-conducting shell layer and the heat-conducting shell, respectively. The battery box according to claim 3, wherein the heat-conducting shell has an inner surface and a plurality of grooves, the inner surface faces the heat-conducting shell and is in thermal contact with the heat-conducting shell, and the grooves are located on the inner surface , the electric heating chips are respectively located in the grooves. The battery box according to claim 1 further includes at least one temperature sensor, and the at least one temperature sensor is disposed on the heat-conducting shell layer or the heat-conducting shell. The battery case as claimed in claim 5, wherein the at least one temperature sensor is disposed on a side of the heat-conducting shell away from the heat-conducting shell. The battery box as claimed in claim 6, wherein the at least one temperature sensor is multiple, and the temperature sensors surround the electric heating sheets. The battery box according to claim 7, wherein the heat-conducting casing has a plurality of casing sides facing away from the battery pack, a casing top surface, and a casing bottom surface, and the casing top surface and the casing bottom surface are opposite to each other And the side surfaces of the casing are between the top surface of the casing and the bottom surface of the casing, the side surfaces of the casing surround the heat conduction shell, and the temperature sensors are respectively located on the side surfaces of the heat conduction shell, The top surface of the casing and the bottom surface of the casing. The battery case according to claim 2, wherein the heat-conducting shell has a plurality of shell sides facing away from and surrounding the battery cells, and the electric heating sheets are respectively located on the shell sides. The battery box as described in claim 5, further comprising a controller, the controller is electrically connected to the at least one electric heater and the at least one temperature sensor, and is used to measure the temperature measured by the at least one temperature sensor A temperature data is used to control the at least one electric heater.

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