Stacked battery pack

Abstract

This invention provides a stacked battery pack that allows for shorter wiring between battery cells and ensures consistent wiring lengths for each battery cell, even when the case is filled with a filler. [Solution] The stacked battery pack 1 comprises a case 2 having a partition wall 3 capable of separating a first area A1 and a second area A2, battery cells 40-43, equipment 5, wiring 60-63 electrically connecting the battery cells 40 and equipment 5, and a protective member 7 that sandwiches and protects the wiring 60-63 and allows the wiring 60-63 to pass through the partition wall 3. The partition wall 3 is a set of assembled partition walls 30-33 that can be attached to the inside of the case 2, and the assembled partition walls 30-33 are assembled and installed surrounding the protective member 7.

Description

Technical Field

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

Background Art

[0002] Patent Document 1 discloses a battery technology having a laminate composed of at least stacked single cells (battery cells), a deformation absorbing portion, and an anisotropic extension portion. In this battery, the deformation absorbing portion is disposed between the lid member and the stacked single cells and is configured to absorb deformation in the stacking direction of the single cells, and the anisotropic extension portion is disposed on the side surface of the laminate. When the single cells deform in the stacking direction, it is configured to extend in the stacking direction in response to this deformation.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in the above-described conventional battery, after stacking battery cells (single cells) in the vertical direction in a case, in order to fix each battery cell, it is conceivable to pour a curable filler into the space between the case and the laminate to fix it. In this case, in the conventional battery, it is also necessary to arrange devices such as connectors for device connection and SBM (Satellite Battery Module) in the case. For this reason, in the conventional battery, in order to ensure the replaceability and quality of those devices, it is necessary not to be filled with the filler, and it is conceivable to provide a partition wall for partitioning between the battery cells and the devices.

[0005] However, when a partition wall is installed between the battery cells and the equipment, the wiring connecting the battery cells and the equipment must be routed around the partition wall, resulting in longer wiring and making it difficult to match the length of the wiring for each stacked battery cell. There was room for improvement.

[0006] This disclosure has been made in view of the above, and aims to provide a stacked battery pack that allows for shorter wiring of battery cells and equalizes the length of wiring for each battery cell, even when the case is filled with a filler. [Means for solving the problem]

[0007] The stacked battery pack according to this disclosure comprises a case having a partition wall capable of separating a first area and a second area; one or more battery cells housed in the first area and fixed within the case with a filler material; one or more devices housed in the second area and electrically connectable to the battery cells; wiring electrically connecting the battery cells and the devices; and a protective member that sandwiches and protects the wiring and allows the wiring to pass through the partition wall, wherein the partition wall is a modular partition wall that can be attached to the inside of the case, and the modular partition wall is assembled and installed surrounding the protective member. [Effects of the Invention]

[0008] According to this disclosure, even when the case is filled with a filler, the wiring of the battery cells can be shortened, and the length of the wiring for each battery cell can be made uniform. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 is a cross-sectional view showing the schematic configuration of a stacked battery pack according to one embodiment. [Figure 2] Figure 2 is a schematic cross-sectional view of a stacked battery pack according to one embodiment, viewed from the front before assembly. [Figure 3]Figure 3 is a schematic cross-sectional view of a stacked battery pack according to one embodiment, viewed from the front after assembly. [Figure 4] Figure 4 is a schematic cross-sectional view of a stacked battery pack according to one embodiment, taken from the side after assembly. [Figure 5] Figure 5 is a schematic cross-sectional view of a conventional stacked battery pack in a side view. [Modes for carrying out the invention]

[0010] The stacked battery pack according to the embodiments of this disclosure will be described below 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 can be replaced by a person skilled in the art.

[0011] [Outline configuration of a stacked battery pack] Figure 1 is a cross-sectional view showing the schematic configuration of a stacked battery pack according to one embodiment. The stacked battery pack 1 shown in Figure 1 comprises a case 2 having a storage space, and a partition wall 3 provided inside the case 2 that separates the space inside the case 2 into a first area A1 and a second area A2. Furthermore, the stacked battery pack 1 comprises one or more battery cells 40-43 (hereinafter, when referring to any of the battery cells 40-43, simply referred to as "battery cell 4") housed in the first area A1 and fixed inside the case 2 by filling with a filler material (not shown), and one or more devices 5 housed in the second area A2 and electrically connectable to the battery cell 4.

[0012] Case 2 is formed from a highly rigid material. Case 2 houses a battery cell 4 fixed by a filler material (not shown) in a first area A1, and houses one or more devices 5 electrically connectable to the battery cell 4 in a second area A2.

[0013] The bulkhead 3 has a plurality of prefabricated bulkheads 30-33 (sluice gates) that can be partially attached to the inside of the case 2. Specifically, the bulkhead 3 is partially cut out, and the plurality of prefabricated bulkheads 30-33 are inserted into a pair of support columns provided on the left and right sides of the cutout area to form the bulkhead. The bulkhead 3 functions as a sluice gate to prevent the filler material from flowing from the first area A1 to the second area A2 when the filler material is poured into the first area A1. In addition, each of the plurality of prefabricated bulkheads 30-33 is installed with a pair of upper and lower protective members 7 sandwiched between them.

[0014] The battery cells 40-43 are arranged vertically stacked in the first area A1 of case 2. The battery cells 40-43 are constructed using bipolar lithium-ion batteries or the like. The battery cells 40-43 are fixed to the first area A1 of case 2 by pouring a filler material such as a curable resin into the first area A1 of case 2. Furthermore, each of the battery cells 40-43 is electrically connected to the equipment 5 housed in the second area A2 via wiring 60-63.

[0015] Device 5 is electrically connected to each of the battery cells 40-43 via wiring 60-63. Device 5 is, for example, a connector, an ECU (Electronic Control Unit), or a control module such as an SBM.

[0016] Wiring 60-63 (hereinafter, when referring to any of wiring 60-63, it will simply be referred to as "wiring 6") electrically connects the battery cell 4 and the equipment 5 via the partition wall 3 and protective member 7. Wiring 6 is constructed using FPC (Flexible Printed Circuit) wiring such as thermistors and voltage detection lines.

[0017] The protective member 7 is provided between each of the multiple assembly partitions 30 to 33, protecting the wiring 6 by sandwiching it from above and below, and allowing the wiring 6 to pass through the partition 3. The protective member 7 is constructed using a sealing material such as sponge.

[0018] A method for assembling the stacked battery pack 1 configured as described above will be described. FIG. 2 is a schematic cross-sectional view of the stacked battery pack 1 before assembly, viewed from the front. FIG. 3 is a schematic cross-sectional view of the stacked battery pack 1 after assembly, viewed from the front. FIG. 4 is a schematic cross-sectional view of the stacked battery pack 1 after assembly, viewed from the side. FIG. 5 is a schematic cross-sectional view of a conventional stacked battery pack, viewed from the side.

[0019] As shown in FIG. 2, in the stacked battery pack 1, wiring 6 is sandwiched and protected via a protection member 7 at each boundary (upper surface or lower surface) of a plurality of assembly partitions 30 to 33 (water gates) and the wall 3 and the assembly partition 30. The wiring 6 is taken out from the first area A1 filled with a filler to the second area A2 while penetrating the partition 3, and is stacked in the case 2 in the order of the assembly partition 30, the assembly partition 31, the assembly partition 32, and the assembly partition 33 (see FIGS. 3 and 4). Subsequently, in the stacked battery pack 1, the battery cell 4 is fixed in the first area A1 of the case 2 by pouring a filler 8 into the first area A1 of the case 2.

[0020] On the other hand, in the conventional stacked battery pack 1A shown in FIG. 5, when a partition 3A is provided to partition between the battery cell 4 and the device 5, wirings 91 to 94 for connecting each of the battery cell 4 and the device 5 need to be connected by bypassing the partition 3A, so that each of the wirings 91 to 94 becomes long. Further, in the conventional stacked battery pack 1A, it is difficult to make the lengths of the wirings 91 to 94 for each of the stacked battery cells 4 uniform, and the versatility is lacking.

[0021] On the other hand, as shown in FIG. 4, the stacked battery pack 1 accommodates the battery cell 4 fixed in the case 2 with a filler (not shown) in the first area A1 of the case 2, and accommodates one or more devices 5 electrically connectable to the battery cell 4 in the second area A2. Even when electrically connected by the wiring 6 via the partition 3, the wiring 6 of the battery cell 4 can be shortened and the lengths of the wiring 6 for each battery cell 4 can be made uniform.

[0022] According to the embodiment described above, the wiring 6 is protected by sandwiching it between the boundaries (upper or lower surfaces) of each of the multiple assembled bulkheads 30-33 (sluice gates) and between bulkhead 3 and assembled bulkhead 30 via a protective member 7. The wiring 6 is then passed through bulkhead 3 to the second area A2, which is filled with filler material. As the assembled bulkheads 30, 31, 32, and 33 are stacked in the case 2 in this order, the wiring 6 of the battery cell 4 can be shortened, and the length of the wiring 6 for each battery cell 4 can be made uniform.

[0023] Furthermore, in one embodiment, a claw-fitting structure for fixing the protective member 7 may be provided between the partition wall 3 and the multiple assembled partition walls 30-33 (sluice gates) for the purpose of fixing the protective member 7 and compressing the space between them.

[0024] In one embodiment, holders, wiring grip holes, etc., for fixing the wiring 6 may be provided in multiple assembly bulkheads 30-33 (sluice gates).

[0025] In one embodiment, a structure for fixing the equipment 5 may be provided in the multiple assembly partitions 30-33 (sluice gates). In this case, the multiple assembly partitions 30-33 (sluice gates) may be provided with holes or the like on the second area A2 side for fitting the connector claws of the equipment 5.

[0026] In one embodiment, the partition wall 3 may be fixed between the multiple assembled partition walls 30-33 (sluice gates) using double-sided tape or the like.

[0027] In one embodiment, busbars or the like may be provided inside multiple assembled partition walls 30-33 (sluice gates) by insert molding.

[0028] Further effects and modifications can be readily derived by those skilled in the art. Therefore, broader aspects of the present invention are not limited to the specific details and representative embodiments expressed and described above. Accordingly, various modifications are possible without departing from the spirit or scope of the overall concept of the invention as defined by the appended claims and their equivalents. [Explanation of symbols]

[0029] 1. Stacked battery pack 2 cases 4 battery cells 5 Equipment 6 Wiring 7. Protective components 8 Filler 30-33 Assembly bulkheads A1 First Area A2 Second Area

Claims

1. A case having a partition wall that can separate the first area and the second area, One or more battery cells housed in the first area and fixed within the case with a filler, One or more devices housed in the second area and electrically connectable to the battery cell, Wiring that electrically connects the battery cell and the device, A protective member that sandwiches and protects the aforementioned wiring and allows the wiring to pass through the partition wall, Equipped with, The aforementioned partition wall is A portion of it is an assembly partition that can be installed inside the case, The aforementioned assembly bulkhead is, The aforementioned protective member is assembled and installed by sandwiching and surrounding it. Stacked battery pack.

2. A stacked battery pack according to claim 1, The aforementioned assembly bulkhead is, There are multiple, The protective member is There are multiple, The assembled partition wall and the protective member are, The partition wall is formed by stacking them alternately, Stacked battery pack.

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