Patent Application
20170047630
The disclosure relates to a lithium battery, more particularly to a lithium battery module capable of exhaust and pressure relief.
A common lithium battery is generally made by multiple battery cells connected in series or in parallel. Normally the battery cells need to be disposed inside a housing for protection. When the battery cells are not operated properly (e.g. overcharge), the reaction of electrodes and electrolytes in the battery cells occurs and this generates combustible gases. The combustible gases enclosed in the housing may result in increased pressure and may leads to deformation of the housing and explosion of the combustible gases. Arranging pressure relief holes formed on the housing may solve the problems. However, multiple battery cells exhausting combustible gases at the same time can be dangerous because a large amount of combustible gases escape outside and may be ignited. Moreover, water vapor from the environment may penetrate into the inside of the housing via the pressure relief holes and therefore damages the battery cells. Hence, the disposal of the combustible gases is a crucial issue to deal with.
The disclosure provides a lithium battery module capable of exhaust and pressure relief.
The disclosure provides a lithium battery module comprising a sealed housing, a fixture and at least one soft-shell capacitor assembly. A one-way exhaust structure is disposed on the sealed housing. The fixture is accommodated in the sealed housing. The at least one soft-shell capacitor assembly is disposed on the fixture. The soft-shell capacitor assembly is pressed and fixed by the fixture while a vent is formed on the soft-shell capacitor assembly.
Preferably, the one-way exhaust structure comprises an air passage, a rubber sleeve and a pressing plate, the air passage is formed in a manner outwardly protruding from the sealed housing while at least one through hole is formed on the air passage, the rubber sleeve is sleeved on the air passage to make the through hole airtight, the pressing plate is fastened with the cover and presses and fixes the rubber sleeve to the air passage. The vent of each soft-shell capacitor assembly is disposed with an absorbent structure for electrolyte
Preferably, the fixture comprises a pair of pressing plates and a plurality of rods, two ends of each rod are respectively connected to each pressing plate, and the soft-shell capacitor assembly is sandwiched between the pair of pressing plates. The number of the soft-shell capacitor assemblies is plural, and the soft-shell capacitor assemblies are stacked up in layers between the pair of pressing plates. The fixture comprises a plurality of elastic pieces each sandwiched between the adjacent soft-shell capacitor assemblies.
Preferably, the number of the soft-shell capacitor assemblies is plural, and the soft-shell capacitor assemblies are stacked up in layers at the fixture. The fixture comprises a plurality of elastic pieces each sandwiched between the adjacent soft-shell capacitor assemblies.
Preferably, further comprising a control circuit board accommodated in the sealed housing, the soft-shell capacitor assemblies being electrically connected to the control circuit board. The vent is disposed with a one-way exhaust structure. The soft-shell capacitor assembly comprises a soft-shell, a plurality of electrodes is accommodated in the soft-shell while lithium electrolyte is filled in the soft-shell to make the electrodes be immersed in the lithium electrolyte, and the vent is formed on the soft-shell. The vent is disposed with a one-way exhaust structure. An inner surface of the sealed housing is covered by waterproof layer which comprises metal materials
In the lithium battery module of the disclosure, the sealed housing provides a space isolated from the environment for storing the soft-shell capacitor assembly. The sealed housing is able to block water vapor and extend the lifespan of the soft-shell capacitor assembly The combustible gases generated by the soft-shell capacitor assembly can be exhausted out of the lithium battery module via the one-way exhaust structure on the sealed housing. During the exhausting process, the sealed housing can be a buffer space to avoid excessive combustible gases going into the environment in a short time, thereby reducing the possibility of ignition.
The disclosure will become more fully understood from the detailed description, and the drawings given herein below is for illustration only, and thus does not limit the disclosure, wherein:
In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the disclosed embodiments. It will be apparent, however, that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are schematically shown in order to simplify the drawing.
Referring to
The sealed housing 100 comprise a box 110 and a cover 120. The box 110 has an opening 111 while the cover 120 covers the opening 111 for closing the box 110. The inside surface of the sealed housing 100 is covered by a waterproof layer 130 which comprises metal materials. In this embodiment, the waterproof layer 130 is a metal foil. The waterproof layer 130 is for preventing the outside water vapor from penetrating into the housing 100. The cover 120 is disposed with a one-way exhaust structure 121 for the gases inside the sealed housing 100 to go through and come out of the sealed housing 100. In this embodiment, the one-way exhaust structure 121 comprises an air passage 122 outwardly protruding from the cover 120. At least one through hole 123 is formed on the lateral side of the air passage 122. A rubber sleeve 124 is sleeved on the outside of the air passage 122 and covers the through hole 123 to make the through hole 123 airtight. The one-way exhaust structure 121 further comprises a pressing plate 125 which is preferably to be hollow. The outer edge of the pressing plate 125 is fastened with the cover 120 while it presses and fixes the rubber sleeve 124 to the end of the air passage 122.
The fixture 200 is accommodated in the sealed housing 100 and comprises a pair of holding plates 210, a plurality of rods 220 and a plurality of elastic pieces 230. In this embodiment, each rod 220 is preferably to be a screw and two ends of each rod 220 are connected to the holding plates 210 respectively so the pair of holding plates 210 are locked and fixed.
The soft-shell capacitor assembly 300 is disposed on the fixture 200. In this embodiment, the number of the soft-shell capacitor assembly 300 is preferably to be multiple. These soft-shell capacitor assemblies 300 are stacked up in layers between the pair of holding plates 210 of the fixture 200. Each elastic piece 230 is arranged to be sandwiched between the adjacent soft-shell capacitor assemblies 300 to make the soft-shell capacitor assemblies 300 be held and fixed.
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In the lithium battery module of the disclosure, the sealed housing 100 provides an isolated space from the environment for accommodating the soft-shell capacitor assembly 300. The sealed housing 100 blocks water vapor to prevent the soft-shell capacitor assembly 300 from contacting the water vapor, thereby extending the lifespan of the soft-shell capacitor assembly 300. Furthermore, the sealed housing 100 can sever as a buffer space for the combustible gases 321 because it can enclose the combustible gases 321. This prevents excessive combustible gases 321 from discharging to the environment, thereby significantly reducing the possibility of ignition.
| Number | Date | Country | Kind |
|---|---|---|---|
| 104126011 | Aug 2015 | TW | national |
