Battery pack

Abstract

To provide a battery pack that can improve energy density. [Solution] The battery pack comprises a case, a plurality of prismatic battery cells arranged in a first direction within the case, and a plurality of cylindrical battery cells arranged in a second direction perpendicular to the first direction between the plurality of prismatic battery cells within the case.

Description

Technical Field

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[0001] The present disclosure relates to a battery pack.

Background Art

[0002] Patent Document 1 discloses a battery module provided with a restraining member, an elastic member, a relief mechanism, etc. for restraining a plurality of battery cells. [[ID=*14]]

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the technology disclosed in Patent Document 1, since other members are included in the battery module, the energy density tends to decrease and there is room for improvement.

[0005] The present disclosure has been made in view of the above, and an object thereof is to provide a battery pack capable of improving the energy density.

Means for Solving the Problems

[0006] The battery pack according to the present disclosure includes a case, a plurality of rectangular battery cells accommodated side by side in a first direction in the case, and a plurality of cylindrical battery cells accommodated side by side between the plurality of rectangular battery cells in a second direction orthogonal to the first direction in the case.

Effects of the Invention

[0007] According to the present disclosure, the pressure received from the rectangular battery cells during expansion can be dispersed and relaxed by the cylindrical battery cells, and the energy density can be improved. Note: There seems to be a formatting issue in the original text where some lines are just tags without any content. I've translated the text as is while trying to keep the structure intact. Also, I've made a minor correction in the "Prior Art Document" translation to make it more grammatically correct in English. If you have any further questions or need more clarification, please let me know.[Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a plan view showing the schematic configuration of a battery pack according to Embodiment 1. [Modes for carrying out the invention]

[0009] A battery pack according to the embodiments of this disclosure will be described with reference to the drawings. Note that the components in the following embodiments include those that are easily replaceable or substantially identical to those that are replaceable by a person skilled in the art.

[0010] The battery pack according to this embodiment can be used as a battery for vehicles such as hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), and battery electric vehicles (BEVs).

[0011] Figure 1 shows the battery pack according to the embodiment with the upper cover (lid member) removed. The battery pack 1 comprises a case (lower case) 11, a plurality of prismatic battery cells 12, and a plurality of cylindrical battery cells 13. Note that Figure 1 only shows the components essential for realizing the battery pack according to the embodiment, and other components are omitted from the illustration.

[0012] Case 11 is for housing components of the battery pack 1, such as prismatic battery cells 12 and cylindrical battery cells 13. Multiple prismatic battery cells 12 and multiple cylindrical battery cells 13 are housed inside case 11.

[0013] The prismatic battery cell 12 is a secondary battery such as a lithium-ion battery. If the prismatic battery cell 12 is composed of a lithium-ion battery, it may be either an electrolyte battery or an all-solid-state battery. The prismatic battery cell 12 is also equipped with terminals 121 and 122. One of these terminals 121 and 122 is the positive terminal, and the other is the negative terminal.

[0014] Multiple prismatic battery cells 12 are housed in the case 11, arranged in a line in the first direction. Furthermore, the prismatic battery cells 12 are arranged in groups of three (in this case) in the first direction. Multiple cylindrical battery cells 13 are also arranged between these groups of prismatic battery cells 12.

[0015] The cylindrical battery cell 13 is a secondary battery such as a lithium-ion battery. If the cylindrical battery cell 13 is composed of a lithium-ion battery, it may be either a liquid-based battery or an all-solid-state battery. The cylindrical battery cell 13 is equipped with terminals 131. These terminals 131 are either positive or negative terminals.

[0016] The cylindrical battery cell 13 is housed in the case 11, between a plurality of prismatic battery cells 12, and arranged in a second direction perpendicular to the first direction. The second direction is perpendicular to the first direction when the battery pack 1 is viewed from above, as shown in Figure 1.

[0017] In conventional battery packs, other components such as restraining members are placed inside the pack to accommodate the expansion of battery cells, which reduces the number of battery cells that can be packed and leads to a decrease in energy density.

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

[0019] According to the battery pack according to the embodiment described above, the pressure received from the rectangular battery cell 12 during expansion can be dispersed and relaxed by the cylindrical battery cell 13. Further, in the battery pack according to the embodiment, since no other members are included in the battery pack, the energy density can be improved.

[0020] Further effects and modifications can be easily derived by those skilled in the art. Therefore, a broader aspect of the present invention is not limited to the specific details and representative embodiments shown and described as above. Accordingly, various changes can be made without departing from the spirit or scope of the general inventive concept defined by the appended claims and their equivalents.

Description of Reference Numerals

[0021] 1 Battery pack 11 Case 12 Rectangular battery cell 121, 122 Terminals 13 Cylindrical battery cell 131 Terminal

Claims

[Claim 1] The case and, In the aforementioned case, a plurality of rectangular battery cells are housed in a line in the first direction, In the above case, a plurality of cylindrical battery cells are housed between the plurality of prismatic battery cells, arranged in a second direction perpendicular to the first direction, A battery pack equipped with the following features.

Images