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Secondary battery pack

A secondary battery and lithium secondary battery technology, applied in secondary battery repair/maintenance, hybrid batteries, circuits, etc., can solve problems such as uneven current density distribution, battery capacity attenuation, poor cycle performance, etc., to achieve battery safety Good performance, improved consistency, improved battery heating effect

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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] The technical problem to be solved by the present invention is to provide a new secondary battery pack to improve the uneven current density distribution between the single cells or inside the battery, the Problems such as heat generation, poor cycle performance, and rapid battery capacity decay at the end of the cycle

Method used

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Embodiment 1

[0054] Such as Figure 4 As shown, in a 345.6V, 40Ah Ni-MH battery pack for a hybrid vehicle, 288 1.2V, 10Ah Ni-MH single batteries 101 are connected in series to form a 345.6V, 10Ah Ni-MH battery unit 102, and then four 345.6V, The 10Ah Ni-MH battery pack units 102 are connected in parallel to form a 345.6V, 40Ah Ni-MH battery pack 103 .

[0055]Since the charging and discharging rate of the hybrid electric vehicle battery pack is quite large, this embodiment and the conventional combination form one, that is, four 1.2V, 10Ah Ni-MH single cells are connected in parallel to form a 1.2V, 40Ah Ni-MH battery, and then the 288 1.2V, 40Ah Ni-MH batteries are connected in series to form a 345.6V, 40Ah Ni-MH battery pack. Compared with this, the phenomenon of uneven current density distribution between single cells will be effectively improved; , that is, 288 1.2V, 40Ah Ni-MH single batteries are connected in series to form a 345.6V, 40Ah Ni-MH battery pack. Compared with this, it c...

Embodiment 2

[0057] Such as Figure 5 As shown, in the 48V, 3000Ah lead-acid battery pack with a charging and discharging current of 1000A for communication backup power supply, 15 2V, 100Ah lead-acid single batteries 201 whose maximum charging and discharging current can reach 5 times are connected in parallel to form a 2V, 1500Ah lead-acid battery pack. Acid battery 202, then 24 2V, 1500Ah lead-acid batteries 202 are connected in series to form a 48V, 1500Ah lead-acid battery unit 203, and then two 48V, 1500Ah lead-acid battery units 203 are connected in parallel to form a 48V, 3000Ah lead-acid battery pack 204.

[0058] This embodiment and the conventional combination form one, namely by 30 2V, 100Ah lead-acid monomer batteries connected in parallel to form 2V, 3000Ah lead-acid batteries (normal working current is 1000A), then by 24 2V, 3000Ah lead-acid batteries in series Compared with a 48V, 3000Ah lead-acid battery pack, the phenomenon of uneven current density distribution between ...

Embodiment 3

[0061] Such as Figure 6 , Figure 7 As shown, in a 288V, 100Ah lithium manganate battery pack for pure electric vehicles, two 3.7V, 12.5Ah lithium manganate cells 301 are connected in parallel to form a 3.7V, 25Ah lithium manganate battery 302, and then 13 3.7 V, 25Ah lithium manganate batteries 302 are connected in series to form a 48V, 25Ah lithium manganate battery pack unit 303, and then four 48V, 25Ah lithium manganate battery pack units 303 are connected in parallel to form a 48V, 100Ah lithium manganate battery pack module 304 , and then six 48V, 100Ah lithium manganate battery pack modules 304 are connected in series to form a 288V, 100Ah lithium manganate battery pack 305 .

[0062] This embodiment and the conventional combination form one, that is, eight 3.7V, 12.5Ah lithium manganate cells are connected in parallel to form a 3.7V, 100Ah lithium manganate battery, and then seventy-eight 3.7V, 100Ah lithium manganate batteries are The batteries are connected in ser...

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Abstract

The invention relates to a secondary batter pack which comprises a plurality of battery pack units connected in parallel mutually, wherein each battery pack unit is formed by at least two secondary batteries connected in series. The invention ensures that the consistency of current density distribution of the batteries is improved, thereby solving the problems of battery heating, poor battery circulating performance and the like and enhancing the battery pack performance.

Description

technical field [0001] The invention relates to the battery field, in particular to a secondary battery pack. Background technique [0002] The more commonly used secondary battery packs include lead-acid battery packs, lithium secondary battery packs, and nickel-metal hydride battery packs. [0003] With the development of electric bicycles, electric motorcycles, micro electric vehicles, electric cars, electric buses, backup power sources, and energy storage power stations, the demand for battery packs with higher total energy is also increasing. Due to the use of single large-capacity batteries or low-voltage large-capacity battery packs, the current is large, the wires are thick, and the energy efficiency is low, so the voltage of the battery pack cannot be made too low; but in terms of insulation, safety and electronic components. From the perspective of consistency and other considerations, the voltage of the battery pack cannot be made too high, so the capacity of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M12/00H01M10/42
CPCY02E60/10
Inventor 林道勇
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