Battery module and method for connecting battery modules in series

Abstract

The invention discloses a battery module and a method for connecting battery modules in series. The main content is as follows: the battery module is connected with the positive end of a battery bus, the negative end of the battery bus and a battery power-on bus to power external modules and be self-powered; the battery module comprises first to fourth diodes, a first switch, a load, a battery pack, and first to sixth interfaces; and the negative electrode of the battery pack is connected with the negative end of the battery bus through the sixth interface and is connected with the negative end of the load through the fourth diode, and the negative end of the load is connected with the negative end of the battery bus through the fifth interface. As the fourth diode with reverse cut-off characteristic is added between the negative end of the load and the negative electrode of the battery pack, and a wire is added between the negative end of the load and the negative end of a power bus, a plurality of battery modules only take electricity from the battery bus when being connected in series, the discharge currents of the battery modules are consistent, and service life shortening of the battery module is avoided.

Description

technical field [0001] The present invention relates to the technical field of uninterruptible power supply (Uninterruptible Power Supply, UPS), in particular to a battery module and a method for connecting battery modules in series. Background technique [0002] At present, in the design of modular UPS, it is often equipped with an intelligent battery module. The power supply is provided by itself and the external module. The internal structure diagram of the battery module is as follows: figure 1 shown. [0003] exist figure 1 Among them, 1 on the left or right side of each diode represents the anode of the diode, 2 represents the cathode of the diode, the positive pole of the battery pack is connected to the positive terminal of the battery bus via the first switch S1, and the negative pole of the battery pack is respectively connected to the negative terminal of the battery bus and the load (including control chip, drive circuit and detection circuit, etc.), while the...

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Problems solved by technology

[0011] It can be seen from the above table (1) that when two battery modules are connected in series, since the load of battery module 1 takes power differently from the load of battery module 2, it is very likely that the battery pack of battery module 1 and The discharge current of the battery pack of battery module 2 is not completely consistent, which leads to inconsistent aging speeds of battery module 1 and battery module 2. After long-term operation, the two battery modules are equivalent to full and weak batteries or new and old batteries used in series. The life of each battery module is greatly reduced. Similarly, when more than 2 battery modules are used in series, the load power of each battery module is not exactly the same, which will also lead to a reduction in the life of each battery module.

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