CN-121986432-A - Energy storage circuit and power supply device

CN121986432ACN 121986432 ACN121986432 ACN 121986432ACN-121986432-A

Abstract

An energy storage circuit and a power supply device belong to the technical field of power supplies and comprise a total positive circuit, a total negative circuit, at least one first current limiting component and a battery module connected between the total positive circuit and the total negative circuit, wherein the battery module comprises a plurality of battery components which are sequentially connected in series, the battery components are respectively supported by a plurality of supporting pieces in one-to-one correspondence, the battery components are arranged in an insulating way with the supporting pieces, the first current limiting component is connected between the two adjacent supporting pieces, and the first current limiting component is used for limiting current between the two adjacent supporting pieces, so that under the condition of double-point insulation failure of a cross-over box (supporting piece), short circuit current is reduced, and the possibility of high-voltage ignition and battery combustion explosion are reduced.

Inventors

CHEN XIAOBO
HU LU
HAO YUCANG

Assignees

宁德时代新能源科技股份有限公司

Dates

Publication Date: 20260505
Application Date: 20231103

Claims (15)

The energy storage circuit is characterized by comprising a total positive circuit, a total negative circuit, at least one first current limiting component and a battery module connected between the total positive circuit and the total negative circuit, wherein the battery module comprises a plurality of battery components which are sequentially connected in series, and the plurality of battery components are respectively supported by a plurality of supporting pieces in a one-to-one correspondence manner; the battery component is arranged in an insulating way with the supporting piece; The first flow limiting component is connected between two adjacent supporting pieces; the first current limiting assembly is used for limiting current between two adjacent supporting pieces.
The energy storage circuit of claim 1, wherein a plurality of said battery assemblies is n said battery assemblies and a plurality of said supports is n said supports; an ith of the battery assemblies is supported by the ith of the supports; The number of the first current limiting components is n-1, and the n-1 first current limiting components are connected in series between each two adjacent supporting pieces in a one-to-one correspondence manner; Wherein n is an integer of 2 or more, and i is a positive integer of n or less.
The tank circuit of claim 2, further comprising two second current limiting components; the positive electrode of the 1 st battery component is connected with the total positive circuit, and the negative electrode of the nth battery component is connected with the total negative circuit; A second current limiting component is respectively connected in series between the 1 st supporting piece and the total positive circuit and between the nth supporting piece and the total negative circuit; the second current limiting assembly is used for limiting the current between the 1 st support and the total positive line and the current between the nth support and the total negative line.
The tank circuit of claim 3, wherein the tank circuit further comprises a first electrical cabinet; The total negative line and the first electric cabinet are connected with an electric platform together, or The main positive line and the first electric cabinet are connected with an electric platform together, or Any one of the support members and the first electric cabinet are commonly connected with the electric platform.
The energy storage circuit of claim 3, wherein the total positive line and the total negative line are sequentially connected in series with an isolating switch assembly, a relay assembly and a filter circuit, wherein the filter circuit is configured to filter a first direct current output by the battery module; the second current limiting component is connected with the isolating switch component in common, or The second current limiting component is connected with the isolating switch component and the relay component together, or The second current limiting component is connected with the filter circuit in a sharing way.
The tank circuit of claim 3, wherein the resistance of each of the first current limiting components is a first predetermined resistance; the resistance value of each second current limiting component is smaller than or equal to the first preset resistance value.
The tank circuit of claim 6, wherein, The resistance of each second current limiting component is one half of the first preset resistance.
The tank circuit of claim 4, wherein when n is even, the n/2 th support is co-connected to the electrical platform with the first electrical cabinet; when n is an odd number, the (n+1)/2 th supporting piece and the first electric cabinet are connected with the electric platform in a sharing way.
The tank circuit of claim 4, wherein the tank circuit further comprises: And a plurality of first capacitive components connected in parallel with the first current limiting components in a one-to-one correspondence.
The tank circuit of claim 9, wherein the tank circuit further comprises: and a plurality of second capacitive components connected in parallel with the second current limiting components in a one-to-one correspondence.
The tank circuit of claim 10, wherein the capacity value of each of the first capacitive components is a first predetermined capacity value; The capacity value of each second capacity component is one half of the first preset capacity value.
The tank circuit of claim 1, further comprising a second electrical cabinet and two voltage divider assemblies; Two voltage dividing assemblies are connected in series between the total positive line and the total negative line; the two voltage dividing assemblies and the second electric cabinet are connected to the electric platform together.
The tank circuit of claim 12, further comprising a plurality of third capacitive components; each of the first current limiting assemblies is connected in parallel with each of the third capacitive assemblies.
A tank circuit as claimed in any one of claims 1 to 13, further comprising: and the conversion circuit is connected with the total positive line and the total negative line and is configured to convert the first direct current output by the battery module so as to output alternating current.
A power supply device comprising a tank circuit according to any one of claims 1 to 14.

Description

Energy storage circuit and power supply device Technical Field The application belongs to the technical field of power supplies, and particularly relates to an energy storage circuit and a power supply device. Background The related energy storage circuit comprises a plurality of battery packs which are connected in series and/or in parallel, and the short-circuit protection mode is that a fuse is arranged at the positive electrode of the energy storage circuit or the negative electrode of the energy storage circuit, or the fuse is arranged in each battery pack, and the two modes can only reduce the possibility of serious safety faults such as battery combustion explosion and the like under the condition that the positive electrode of the energy storage circuit and the negative electrode of the energy storage circuit are short-circuited, and the serious safety problems such as high-voltage ignition and battery combustion explosion and the like are easily caused when double-point insulation failure of a cross-electric box (supporting piece) occurs, namely, when insulation failure occurs in the two electric boxes respectively, the voltage difference is high, the short-circuit current is extremely large. The related tank circuits cannot reduce the safety risk in case of a double-point insulation failure across the electrical box. Content of the application In view of the above, the present application provides an energy storage circuit and a power supply device, which aim to solve the problem that the related energy storage circuit cannot reduce the safety risk under the condition of double-point insulation failure of a cross-over box. In a first aspect, the present application provides an energy storage circuit, including a total positive line, a total negative line, at least one first current limiting component, and a battery module connected between the total positive line and the total negative line, where the battery module includes a plurality of battery components sequentially connected in series, and the plurality of battery components are respectively supported by a plurality of supporting members in one-to-one correspondence; the battery component is arranged in an insulating way with the supporting piece; The first flow limiting component is connected between two adjacent supporting pieces; the first current limiting assembly is used for limiting current between two adjacent supporting pieces. In the technical scheme of the embodiment of the application, the battery assembly and the supporting pieces are arranged in an insulating way, and the first current limiting assembly is connected in series between the two adjacent supporting pieces, so that under the condition that double-point insulation failure of the cross-electric box (supporting piece) occurs, namely, insulation failure occurs in the supporting pieces respectively, one or more first current limiting assemblies are connected in series between the two supporting pieces with the insulation failure, and due to the current limiting effect of the one or more first current limiting assemblies, the short circuit current is reduced, and the possibility of triggering high-voltage ignition and battery combustion explosion is reduced. In some embodiments, the plurality of battery packs is n of the battery packs, and the plurality of supports is n of the supports; an ith of the battery assemblies is supported by the ith of the supports; The number of the first current limiting components is n-1, and the n-1 first current limiting components are connected in series between each two adjacent supporting pieces in a one-to-one correspondence manner; Wherein n is an integer of 2 or more, and i is a positive integer of n or less. Through adopting above-mentioned scheme, every is adjacent all be provided with first current limiting component between the support piece, under the condition that takes place insulation failure in two arbitrary support pieces respectively, all have a current limiting component to the short circuit current to carry out the current limiting, further reduced the possibility of initiating high voltage ignition and battery combustion explosion. In some embodiments, the tank circuit further comprises two second current limiting components; the positive electrode of the 1 st battery component is connected with the total positive circuit, and the negative electrode of the nth battery component is connected with the total negative circuit; A second current limiting component is respectively connected in series between the 1 st supporting piece and the total positive line and between the nth supporting piece and the total negative line; the second current limiting assembly is used for limiting the current between the 1 st support and the total positive line and the current between the nth support and the total negative line. A second current limiting component is connected in series between the 1 st support piece and the total positive ci