Connection structure of battery cell

Abstract

The utility model provides a connection structure of a battery unit, which can reduce the load of a terminal. A battery cell connection structure includes a first bus bar connected to a terminal of a battery cell, and a second bus bar connecting the first bus bars of adjacent battery cells. The first bus bar and the second bus bar are connected by a roller.

Description

Technical Field

[0001] The present disclosure relates to a connection structure of battery cells. Background Art

[0002] Patent Document 1 discloses a technology in which a bent portion is provided on a bus bar to suppress the effect of an excessive load on the terminals of a battery cell when the battery cell expands.

[0003] Patent Document 1: Japanese Patent Application Laid-Open No. 2015-207442

[0004] In the technology disclosed in Patent Document 1, since the bus bars are directly fixed to the terminals, when the battery cells expand and the bus bars extend, a load is easily applied to the terminals. Utility Model Content

[0005] In view of the above, an object of the present disclosure is to provide a battery cell connection structure that can reduce the load on terminals.

[0006] The battery cell connection structure according to the present disclosure includes a first bus bar connected to a terminal of a battery cell and a second bus bar connecting the first bus bars of adjacent battery cells. The first bus bar and the second bus bar are connected by rollers.

[0007] According to the present disclosure, the first bus bar and the second bus bar are connected by the rollers, and when the battery cell expands, the first bus bar slides relative to the second bus bar, thereby reducing the load on the terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1A It is a perspective view showing a battery cell connection structure according to an embodiment before the battery cell expands.

[0009] Figure 1B It is a perspective view showing a battery cell after expansion in the battery cell connection structure according to the embodiment.

[0010] Figure 2A It is a side view showing the battery cell connection structure according to the embodiment before the battery cell expands.

[0011] Figure 2B It is a side view showing the battery cell connection structure according to the embodiment after the battery cell is expanded.

[0012] Figure 3 It is a perspective view showing a state in which the battery unit according to the embodiment is assembled.

[0013] Figure 4 This is a perspective view showing a battery cell after expansion in a modification of the battery cell connection structure according to the embodiment.

[0014] Figure 5A It is a side view showing a battery cell before expansion in a modification of the battery cell connection structure according to the embodiment.

[0015] Figure 5B It is a side view showing a battery cell after expansion in a modification of the battery cell connection structure according to the embodiment. DETAILED DESCRIPTION

[0016] The connection structure of the battery cell according to the embodiment of the present disclosure will be described with reference to the drawings. Components in the following embodiments include those that can be easily replaced by those skilled in the art or substantially the same components.

[0017] The battery cell according to the embodiment can be used as a battery for, for example, a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), or an electric vehicle (BEV).

[0018] Figure 1A and Figure 1B : is a perspective view showing a connection structure of a battery cell according to an embodiment. Figure 2A and Figure 2B 1 is a side view showing a battery cell connection structure according to an embodiment. As shown in the figure, the battery cell connection structure according to the embodiment includes a plurality of battery cells 1, a plurality of first bus bars 3, and a plurality of second bus bars 5.

[0019] The battery cell 1 is provided with two terminals 2. One of the two terminals 2 is a positive electrode terminal, and the other of the two terminals 2 is a negative electrode terminal.

[0020] The first bus bar 3 is formed in a rod shape. One end of the first bus bar 3 is connected to the terminal 2. That is, one end of the first bus bar 3 is fixed to the terminal 2 by welding or the like.

[0021] The second bus bar 5 is formed in a plate shape and connects the first bus bars 3 of adjacent battery cells 1 .

[0022] The first busbar 3 and the second busbar 5 are connected via rollers 4. Specifically, rollers 4 are provided on the other end of the first busbar 3. Furthermore, the first busbar 3 contacts the lower surface of the second busbar 5 via the rollers 4. Furthermore, the first busbar 3 is configured to slide in a predetermined direction relative to the lower surface of the second busbar 5 via the rollers 4.

[0023] The term "the other end of the first bus bar 3" refers to the end of the first bus bar 3 opposite to the end connected to the terminal 2. The term "predetermined direction (the direction in which the roller 4 slides)" refers to the direction in which the battery cell 1 expands, as described later. While this embodiment illustrates an example in which the roller 4 is provided on the side of the first bus bar 3, the roller 4 may also be provided on the side of the second bus bar 5.

[0024] Here, when the battery cells 1 deteriorate and swell, the battery cells 1 separate from each other in a predetermined direction, such as Figure 1B At this time, if the first and second bus bars are fixed as before, the load (stress) will be concentrated on the terminals of the battery cell, which may cause damage or deformation of the terminals, leading to problems such as electrolyte leakage.

[0025] Therefore, in the connection structure of the battery cell involved in the embodiment, the first bus bar 3 and the second bus bar 5 are not fixed but are brought into contact with each other by the roller 4, thereby solving the above-mentioned problem. In the connection structure of the battery cell involved in the embodiment, for example Figure 2B As shown, even if the battery cells 1 deteriorate and swell, the rollers 4 slide on the lower surface of the second bus bar 5 to separate the battery cells 1. Therefore, no load (stress) is generated on the terminals 2 of the battery cells 1.

[0026] Figure 3 This is a perspective view showing the assembled state of the battery cell according to the embodiment. When the battery cell 1 is assembled into the module, as shown in the figure, the insulating rubber 8 is sandwiched between the lower cover 6 and upper cover 7 of the module, so that the roller 4 is in close contact with the lower surface of the second bus bar 5.

[0027] Modifications will be described below. Figure 4 : is a perspective view showing a modification of the battery cell connection structure according to the embodiment. Figure 5A and Figure 5B This is a side view showing a modified example of the connection structure of the battery cell involved in the embodiment. Figures 1A to 2B In the example shown in FIG. 1 , the rollers 4 are provided on all the first bus bars 3 of the plurality of battery cells 1 . However, the rollers 4 may be provided on a portion of the first bus bars 3 .

[0028] For example, Figure 4 As shown, a structure in which the first busbar 3 without the roller 4 is fixed to the positive terminal 2a and the first busbar 3 with the roller 4 is fixed to the negative terminal 2b may also be employed. In this case, one end of the first busbar 3 is fixed to the terminal 2 by, for example, welding. Furthermore, the other end of the first busbar 3 without the roller 4 is similarly fixed to the second busbar 5 by welding.

[0029] In addition, in this modification, the first busbar 3 without the roller 4 is formed of a material having rigidity. Figure 5A and Figure 5B As shown, by using the second busbar 5 that is bent downward when viewed from the side, the roller 4 and the lower surface of the second busbar 5 are brought into close contact.

[0030] In a modification of the battery cell connection structure according to the embodiment having such a configuration, for example Figure 5B As shown, even if the battery cells 1 deteriorate and swell, the rollers 4 slide on the lower surface of the second bus bar 5 to separate the battery cells 1. Therefore, no load (stress) is generated on the terminals 2 of the battery cells 1.

[0031] According to the battery cell connection structure according to the embodiment described above, the first bus bar 3 and the second bus bar 5 are connected by rollers 4. When the battery cell 1 expands, the first bus bar 3 slides relative to the second bus bar 5. This reduces the load on the terminal 2, the positive terminal 2a, and the negative terminal 2b.

[0032] Those skilled in the art will readily derive further effects and modifications. Therefore, the broader aspects of the present invention are not limited to the specific details and representative embodiments shown and described above. Therefore, various modifications may be made without departing from the spirit or scope of the overall invention concept as defined by the appended claims and their equivalents.

[0033] For example, in the battery cell connection structure according to the embodiment, the first bus bar 3 and the second bus bar 5 are connected via the roller 4 . Alternatively, the first bus bar 3 and the second bus bar 5 may be connected via an elastic member (spring, etc.).

Claims

1. A battery cell connection structure, characterized in that: comprising: a first bus bar connected to a terminal of the battery cell; and The second busbar is connected between the first busbars of adjacent battery cells, and the first busbar and the second busbar are connected by rollers.

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