Box, battery, electrical device and method for manufacturing battery
Provided are a box, a battery, an electrical device, and a method for manufacturing the battery, which belong to the technical field of energy storage devices. The box is applicable to a battery, the battery includes a battery cell, in which the box includes a plurality of box walls, in which the plurality of box walls enclose a first chamber for accommodating the battery cell, and at least one of the box walls is internally provided with a second chamber for accommodating fire-fighting agent, in which the first chamber and the second chamber are configured to be able to communicate with each other when the battery cell is thermal-runaway, so that the fire-fighting agent releases fire-fighting medium into the first chamber. The box, the battery, the electrical device and the method for manufacturing the battery can improve the safety performance of the battery.
1 . A box, applicable to a battery, the battery comprising a battery cell, wherein the box comprises:
a plurality of box walls, wherein the plurality of box walls enclose a first chamber for accommodating the battery cell, and at least one of the box walls is internally provided with a second chamber for accommodating fire-fighting agent, the plurality of box walls are provided with a communication port for allowing the first chamber to be communicated with the second chamber,
a conduit located in the first chamber and having two ends, at least one of the two ends is connected with the box, an inside of the conduit is communicated with the second chamber through the communication port when the battery cell is thermal-runaway, at least a portion of the conduit is configured to be broken by emissions produced by thermal runaway of the battery cell,
a weak member configured for closing the communication port, wherein the conduit is sleeved outside the communication port and the weak member, the weak member is configured to be broken when a pressure of the second chamber reaches a third threshold, so that the first chamber and the second chamber is communicated with each other,
wherein the first chamber and the second chamber are configured to communicate with each other when the battery cell is thermal-runaway to enable the fire-fighting agent to release fire-fighting medium into the first chamber.
2 . The box according to claim 1 , wherein when the first chamber and the second chamber are not in communication, an internal pressure of the second chamber is greater than that of the first chamber.
3 . The box according to claim 1 , wherein the box further comprises:
an electric control valve, for closing the communication port, the electric control valve is configured to open when the battery cell is thermal-runaway, so as to make the first chamber communicated with the second chamber.
4 . The box according to claim 1 , wherein the other end of the conduit is closed.
5 . The box according to claim 1 , wherein, both the two ends of the conduit are respectively connected to the box and in communication with the second chamber.
6 . The box according to claim 1 , wherein the battery cell comprises a first pressure-relief mechanism, wherein the first pressure-relief mechanism is configured to actuate to release pressure when an internal pressure of the battery cell reaches a first threshold or a temperature of the battery cell reaches a second threshold; and at least a portion of the conduit is disposed opposite the first pressure-relief mechanism.
7 . The box according to claim 6 , wherein the conduit comprises a weak part which is disposed opposite the first pressure-relief mechanism, and the weak part is configured to be capable of being broken by the emissions produced by the thermal runaway of the battery cell.
8 . The box according to claim 6 , wherein the conduit comprises a hot-melt part, which is disposed opposite the first pressure-relief mechanism, and the hot-melt part is configured to be able of being thermally melted or broken by the emissions when the battery cell is thermal-runaway.
9 . The box according to claim 1 , wherein the box further comprises:
a hot-melt member, configured for closing the communication port, wherein the hot-melt member is configured to be able to be thermally melted when the battery cell is thermal-runaway, so that the first chamber and the second chamber are communicated with each other.
10 . The box according to claim 1 , wherein each of the box walls is provided with a weak zone, which is configured to be able of being broken when a pressure in the second chamber reaches a third threshold, so that the first chamber is communicated with the second chamber.
11 . The box according to claim 1 , wherein the fire-fighting medium comprises a gas fire-fighting medium.
12 . The box according to claim 1 , wherein the first chamber has an exhaust port, and the fire-fighting medium and the emissions generated by thermal runaway of the battery cell, after being mixed in the first chamber, can be discharged out of the box through the exhaust port.
13 . The box according to claim 12 , wherein the box further comprises a second pressure-relief mechanism, the second pressure-relief mechanism is provided at the exhaust port, and the second pressure-relief mechanism is configured to be actuated to relieve pressure when a pressure within the first chamber reaches a fourth threshold or a temperature within the first chamber reaches a fifth threshold.
14 . The box according to claim 1 , wherein the box further comprises:
a trigger member, arranged in the second chamber and configured for triggering the fire-fighting agent to generate the fire-fighting medium when the battery cell is thermal-runaway.
15 . The box according to claim 1 , wherein each of the box walls is provided with an injection port communicating with the second chamber, and the injection port is configured to inject into the second chamber the fire-fighting agent.
16 . The box according to claim 1 , wherein the weak member comprises a thin sheet configured to close the communication port, the weak member being provided with at least one nick, wherein when pressure received by the weak member does not reach a breaking condition of the nick, the weak member closes the communication port, and when an internal pressure of the second chamber increases to a third threshold value such that the breaking condition of the nick is reached, the nick is broken and the weak member is torn along an extending direction of the nick to form an opening in the weak member that is unable to be closed.
17 . The box according to claim 1 , wherein the weak member is located as a whole in the communication port and is connected to an inner wall of the communication port so as to close the communication port.
18 . The box according to claim 1 , wherein the weak member is located as a whole outside the communication port and is connected to an outer surface of the box wall or connected to an inner wall of the communication port through a connecting member so as to close the communication port.
19 . A battery, comprising:
a battery cell;
the box according to claim 1 , wherein the battery cell is accommodated in the first chamber.
20 . An electrical device, comprising the battery according to claim 19 .