BATTERY CONNECTING DEVICE AND BATTERY PACK HAVING SAME
FIG2 is a schematic diagram of a battery containing cell connection device 100 according to one embodiment of the present disclosure
FIG2 is a schematic diagram of applying cell connection device 100 in a battery comprising cells 10, 20, 30, 40. As shown in FIG2, the battery comprises multiple cells in serial connection, including but not limit to cells 10, 20, 30, 40. The cell connection device 100 is connected between cell 30 and cell 40. The cell 10 is a sample cell. The first connecting terminal 151 of cell connection device 100 is electrically connected to the anode of cell 30. The second connecting terminal 153 is electrically connected to the cathode of cell 40. The cathode connection terminal 173 and the anode connection terminal 174 of the pressure changing unit 170 are respectively electrically connected to cathode and anode of sample cell 10, so the pressure changing unit 170 receives the sample voltage of sample cell 10. In the system shown in FIG2, the operating principle of cell connection device 100 in the battery is: when the battery is in normal working condition, the current flows through cathode of cell 40, conductive lower cover 113, metal sheet 131, conductive upper cover 111, and anode of cell 30 in sequence, forming a loop. The cell connection device 100 is connected in the battery loop in series, functioned as electrically connection, and will not affect the charge or discharge of the battery. When the battery is in abnormal working condition, for example, overcharging, which is represented as the sample voltage of sample cell 10 is equal to or higher than a predetermined value, the pressure changing unit 170 of cell connection device 100 starts to work, so as to increase the pressure in the first space 101, causing a shape change of the metal sheet 131, thereby breaking down the electrical connection between the metal sheet 131 and the conductive upper cover 111 or the conductive lower cover 113 and cutting off the current of the battery, achieving a protection function.
schematic diagram
30
cell
174
anode connection terminal
151
first connecting terminal
100
cell connection device
173
cathode connection terminal
113
conductive lower cover
153
second connecting terminal
40
cell
111
conductive upper cover
102
second space
101
first space
131
metal sheet
170
pressure changing unit
['1. A cell connection device (100), configured to electrically connect a first cell and a second cell in a battery, comprising: a housing comprising a conductive upper cover (111), a conductive lower cover (113), and an electrically insulated side wall (115); a metal sheet (131) electrically connecting the conductive upper cover (111) and the conductive lower cover (113), and separating the housing into a first space (101) and a second space (102), a first connecting terminal (151), electrically connecting an anode of the first cell and the conductive upper cover (111); a second connecting terminal (153), electrically connecting a cathode of the second cell and the conductive lower cover (113); and at least one pressure changing unit (170) disposed in the first space (101), configured to receive a sample voltage of a sample cell (10) in the battery, wherein the pressure changing unit (170) comprises at least one electrochemical unit (171), wherein the electrochemical unit (171) comprises a cathode (175), an anode (176), an electrolyte solution and a shell (172) having at least one opening (179), wherein the cathode (175) and the anode (176) of the electrochemical unit (171) are respectively electrically connected to the anode and cathode of the sample cell (10), wherein the inner chamber of the electrochemical unit (171) communicates with the first space (101); wherein the electrochemical unit (171) is configured to start to work and produce at least one gas to increase the pressure within the first space (101) when the sample voltage is equal to or greater than a predetermined value, so as to break down the electrical connection between the metal sheet (131) and the conductive upper cover (111) or the conductive lower cover (113) and cut off the current of the battery.']