Battery module, power battery and electric vehicle
A technology of battery modules and single cells, which is applied to large-size batteries/battery packs, small-size batteries/battery packs, battery pack components, etc., and can solve problems such as battery volume enlargement, explosion, and battery swelling
Active Publication Date: 2020-04-28
BYD CO LTD
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Problems solved by technology
However, during the use of the battery, the battery will be deformed and freely expanded due to the low tensile strength of the battery casing or structural parts (for example, the frame outside the battery module), resulting in a larger battery volume, from the ideal gas state The equation (PV=nRT) shows that when the temperature is constant, if the volume of the battery increases, the gas pressure inside the battery will decrease, which may cause the flipping part of the current interruption device to fail to flip in time and disconnect the circuit, thus causing The battery swells or even explodes and catches fire
Method used
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[0049] Specific embodiments of the present disclosure will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present disclosure, and are not intended to limit the present disclosure.
[0050] Such as Figure 1 to Figure 8 As shown, the present disclosure provides a battery module, including a reinforced casing 4 and a plurality of single cells 1 , the single cells 1 include a shell and batteries housed in the shell, and the multiple single cells 1 form at least one A series circuit, each series circuit is provided with a second single battery 3 and at least one first single battery 2 connected in series with the second single battery 3, that is, when at least one first single battery 2 is disconnected When looping, the series circuit where all the second single cells 3 and the first single cells 2 are located can be disconnected. The firs...
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Abstract
The invention relates to a battery module, a power battery and an electric vehicle. The battery module comprises a reinforced shell and a plurality of batteries; each battery comprises a housing and abattery cell accommodated in the housing; the plurality of batteries at least form a series circuit; a second battery and at least one first battery connected with the second battery in series are arranged in each series circuit; each first battery is provided with a current interruption device; each current interruption device is used for interrupting the internal current of the corresponding first battery when the first battery is abnormal; and the reinforced shell wraps the shells of the first batteries so as to reduce the expansion deformation of the first batteries. By means of the technical schemes, the reinforced shell can well limit the expansion of the first batteries while with the lightness of the weight of the battery module and a vehicle body ensured; and it is guaranteed that enough air pressure exists in the first batteries to enable the current interruption devices to be started in time.
Description
technical field [0001] The present disclosure relates to the battery field, and in particular, to a battery module, a power battery using the battery module, and an electric vehicle using the power battery. Background technique [0002] As an energy storage unit, batteries play an important role in various industries. For example, in the field of new energy vehicles, power batteries are widely used. The battery pack of the power battery can have multiple battery modules, and the battery module can be formed by connecting multiple single batteries in series or in parallel, so as to realize the function of charging and discharging the power battery. During the charging and discharging process of the power battery, if the battery is overcharged to a certain extent, it will cause the battery to swell or even explode and catch fire. Or thermal runaway, the circuit is disconnected spontaneously, so as to protect the battery and prevent the battery from exploding and igniting. ...
Claims
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Patent Timeline
Login to View More IPC IPC(8): H01M2/02H01M2/26H01M2/34H01M10/04H01M50/10H01M50/531H01M50/572
CPCH01M10/0445H01M50/10H01M50/531H01M50/572Y02E60/10Y02P70/50
Inventor 杨睿王高武戴伟杰朱燕沈晞
Owner BYD CO LTD