battery pack

Abstract

This invention provides a battery pack capable of improving energy density. The battery pack includes: a housing; a plurality of square battery cells arranged and housed in the housing in a first direction; and a plurality of cylindrical battery cells located between the plurality of square battery cells in the housing and arranged and housed in a second direction orthogonal to the first direction.

Description

Technical Field

[0001] This disclosure relates to a battery pack. Background Technology

[0002] Patent document 1 discloses a battery module that includes a constraint component or elastic component for constraining multiple battery cells, an obstacle avoidance mechanism, etc.

[0003] Patent document 1: Japanese Patent Application Publication No. 2016-091916.

[0004] In the technology disclosed in Patent Document 1, the energy density is easily reduced because other components are included in the battery module, leaving room for improvement. Utility Model Content

[0005] This disclosure was made in view of the above circumstances, and its purpose is to provide a battery pack capable of improving energy density.

[0006] The battery pack disclosed herein includes: a housing; a plurality of square battery cells arranged and housed in the housing in a first direction; and a plurality of cylindrical battery cells located between the plurality of square battery cells in the housing and arranged and housed in a second direction orthogonal to the first direction.

[0007] According to this disclosure, the pressure exerted on the square battery cell during expansion can be alleviated by dispersing it through the cylindrical battery cell, while simultaneously increasing the energy density. Attached Figure Description

[0008] Figure 1 This is a top view showing the general configuration of the battery pack involved in Embodiment 1. Detailed Implementation

[0009] The battery pack according to embodiments of this disclosure will be described with reference to the accompanying drawings. Furthermore, the constituent elements in the following embodiments include elements that can be easily substituted or are substantially the same by those skilled in the art.

[0010] The battery packs involved in the implementation can be used as batteries for vehicles such as hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), and electric vehicles (BEVs).

[0011] Figure 1This indicates the state where the top cover (cover component) has been removed from the battery pack according to the embodiment. The battery pack 1 includes a housing (lower housing) 11, multiple square battery cells 12, and multiple cylindrical battery cells 13. Furthermore, in... Figure 1 The illustrations only show the components necessary for implementing the battery pack in the embodiment, and other components are omitted.

[0012] The housing 11 is used to house the components of the battery pack 1, such as square battery cells 12 or cylindrical battery cells 13. Multiple square battery cells 12 and multiple cylindrical battery cells 13 are housed inside the housing 11.

[0013] The square battery cell 12 is a rechargeable battery, such as a lithium-ion battery. When the square battery cell 12 is composed of a lithium-ion battery, it can be either a liquid-system battery or an all-solid-state battery. Furthermore, the square battery cell 12 has terminals 121 and 122. One of these terminals 121 and 122 is the positive terminal, and the other is the negative terminal.

[0014] Multiple square battery cells 12 are arranged and housed in the housing 11 in a first direction. Furthermore, the square battery cells 12 are arranged in groups of multiples (in this case, three) in the first direction. Additionally, multiple cylindrical battery cells 13 are arranged between these multiple square battery cells 12.

[0015] The cylindrical battery cell 13 is a rechargeable battery, such as a lithium-ion battery. When the cylindrical battery cell 13 is composed of a lithium-ion battery, it can be either a liquid-system battery or an all-solid-state battery. The cylindrical battery cell 13 has a terminal 131. This terminal 131 can be either a positive or negative terminal.

[0016] Cylindrical battery cells 13 are located within housing 11 among a plurality of square battery cells 12 and are arranged and housed in a second direction orthogonal to the first direction. For example... Figure 1 As shown, when viewed from above, the second direction is orthogonal to the first direction.

[0017] In the past, in order to cope with the expansion of battery cells, other components such as restraint components were required to be installed in the battery pack. As a result, the number of battery cells loaded was reduced, which led to a decrease in energy density.

[0018] On the other hand, in the battery pack according to the embodiment, the above-mentioned problem is solved by providing cylindrical battery cells 13 between the square battery cells 12. That is, in the battery pack 1, by stacking two types of battery cells with different shapes (square and cylindrical), the direction of the force when the battery cells expand is dispersed. This reduces the load on the housing 11 without increasing the rigidity or weight of the housing 11, providing a high-density and lightweight battery pack 1.

[0019] According to the battery pack described above, the pressure exerted on the square battery cell 12 during expansion can be alleviated by dispersing it through the cylindrical battery cell 13. Furthermore, since no other components are included in the battery pack described in this embodiment, the energy density can be increased.

[0020] Those skilled in the art can readily derive further effects and variations. Therefore, the broader scope of this invention is not limited to the specific details and representative embodiments shown and described above. Thus, various modifications can be made without departing from the spirit or scope of the general design concept as defined by the appended claims and their equivalents.

Claims

1. A battery pack characterized by comprising: have: case; Multiple square battery cells are arranged and housed in the housing in a first direction; and Multiple cylindrical battery cells are located in the housing between the multiple square battery cells and arranged in a second direction orthogonal to the first direction.

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