Battery module and battery pack

Abstract

The utility model provides a battery module and a battery pack, the battery module comprises a plurality of battery cells, the plurality of battery cells are superposed along a first direction to form a plurality of battery cell groups which are continuously arranged along the first direction, each battery cell group comprises two battery cells, and the battery cells are provided with a first pole and a second pole which are positioned on the same side along a third direction; in the second direction, the first pole columns of the two battery cells in each battery cell group are arranged on the same side, the first pole columns of the battery cells in two adjacent battery cell groups are arranged on different sides, and the distances between the first pole columns and the central surfaces of the battery cells and the distances between the second pole columns and the central surfaces of the battery cells are different; the first end of the sheet is connected with the first pole of one battery cell in one battery cell group, the second end of the sheet is connected with the second pole of one battery cell in the other battery cell group, and one battery cell group is adjacent to the other battery cell group; and in the first direction, the chips located in the middle are arranged in pairs. According to the utility model, the problem that the bus bar is inconvenient to install and fix in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery module and a battery pack. Background Art

[0002] At present, the new energy industry is developing rapidly, and new energy batteries are widely used in the automotive and energy storage industries. Battery energy density is getting higher and higher, and the spatial layout is becoming more and more compact. The same-side output pole module improves space utilization and simplifies the complexity of battery pack parts layout, but it also has certain limitations.

[0003] However, since the distance from the positive and negative poles to the middle of the battery cells on the market is the same, during the later installation of the battery cells, one tab may block the pole of another battery cell, which will result in the installation of the tab of the blocked pole of the battery cell, affecting the installation of the tab. Utility Model Content

[0004] The main purpose of the utility model is to provide a battery module and a battery pack, which solves the problem of inconvenient installation of the bus bar in the prior art by changing the distance between the positive and negative poles and the middle of the battery cell.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a battery module is provided, comprising a plurality of battery cells, wherein the plurality of battery cells are stacked along a first direction to form a plurality of battery cell groups continuously arranged along the first direction, each battery cell group comprising two battery cells, and the battery cells having a first pole and a second pole located on the same side along a third direction; along the second direction, the first poles of the two battery cells in each battery cell group are arranged on the same side, and the first poles of the battery cells in two adjacent battery cell groups are arranged on different sides, and the first pole and the second pole are at different distances from the central plane of the battery cell; wherein the first direction, the second direction and the third direction are perpendicular to each other; a bar sheet, wherein the first end of the bar sheet is connected to the first pole of a battery cell in one battery cell group, and the second end of the bar sheet is connected to the second pole of a battery cell in another battery cell group, wherein one battery cell group is arranged adjacent to another battery cell group; and along the first direction, the bar sheets located in the middle are arranged in pairs, the first ends of the two bar sheets arranged in pairs are respectively connected to the first poles of the two battery cells in the same battery cell group, and the second ends of the two bar sheets arranged in pairs are respectively connected to the second poles of the battery cells in different battery cell groups.

[0006] Further, at least a portion of the two bar sheets arranged in a pair are overlapped along the third direction.

[0007] Furthermore, the bar piece includes an intermediate plate segment, a bent plate segment, and a connecting plate segment. The connecting plate segments are arranged in pairs. The two connecting plate segments arranged in pairs are respectively bent and formed on two side surfaces of the intermediate plate segment by the bent plate segments. The connecting plate segments arranged in pairs are respectively located at the first end and the second end of the bar piece, and are respectively used to connect to the first pole and the second pole.

[0008] Further, projections of the middle plate sections of the two bar sheets arranged in a pair along the third direction at least partially overlap.

[0009] Furthermore, in the two bars arranged in pairs, the bent plate section of the bar whose middle plate section is located on the side away from the battery cell is bent toward the battery cell, and the bent plate section of the bar whose middle plate section is located on the side close to the battery cell is bent toward the direction away from the battery cell.

[0010] Further, output bars are arranged in pairs, two of which are arranged on one side of the multiple battery cells along the first direction, and the two of which are electrically connected to the first pole of one battery cell in the same battery cell group and the second pole of another battery cell respectively; and / or opposite-side bars, which are arranged on the other side of the multiple battery cells along the first direction, one end of the opposite-side bar is connected to the first pole of one battery cell in the same battery cell group, and the other end of the opposite-side bar is connected to the second pole of another battery cell in the battery cell group.

[0011] Furthermore, the opposite side bar includes a first plate segment, which is connected to the first pole; a second plate segment, which is connected to the second pole, and the first plate segment and the second plate segment are coplanar; a third plate segment, which is bent and formed on the same side of the first plate segment and the second plate segment, and the third plate segment is located on the outside of the multiple battery cells along the first direction.

[0012] Further, along the third direction, an insulating layer is provided at the overlapping portion of the opposite side bar piece and the bar piece; and / or an insulating layer is provided at the overlapping portion of the output bar piece and the bar piece; and / or an insulating layer is provided at the overlapping portion between the bar pieces.

[0013] Furthermore, the battery module also includes an explosion-proof valve, which is arranged on the same side of the battery cell as the first pole and the second pole, and there is no overlap between the explosion-proof valve and the bar along the third direction.

[0014] According to another aspect of the present invention, a battery pack is provided, comprising the above-mentioned battery module.

[0015] By applying the technical solution of the utility model, the following technical effects are achieved:

[0016] By adopting different distances between the two poles of the battery cell and the center plane of the battery cell along the second direction, when installing the bar, the mutual interference between the bar pieces can be reduced to facilitate the installation of the bar pieces, and the bar pieces are distributed neatly, simplifying the FPC structure design. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0018] Figure 1 It is a three-dimensional structural schematic diagram of the battery module of the utility model;

[0019] Figure 2 It is a three-dimensional structure explosion diagram of the battery module of the utility model;

[0020] Figure 3 A top view of the battery cell of the utility model;

[0021] Figure 4 It is a structural schematic diagram of the bar piece of the utility model;

[0022] Figure 5 It is a structural schematic diagram of the opposite side bar of the utility model.

[0023] The above drawings include the following reference numerals:

[0024] 1. Battery cell; 11. First pole; 12. Second pole; 2. Bar; 21. Middle plate section; 22. Bent plate section; 23. Connecting plate section; 3. Output bar; 4. Opposite side bar; 41. First plate section; 42. Second plate section; 43. Third plate section; 5. Explosion-proof valve. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0027] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0028] In order to solve the problem of inconvenient installation of the busbar in the prior art, the utility model provides a battery module and a battery pack, which facilitate the installation and fixation of the busbar by changing the distance between the positive and negative poles and the middle of the battery cell.

[0029] Embodiment 1

[0030] A battery module, see Figures 1 to 5 The battery module includes a plurality of battery cells 1 and a bar sheet 2. The plurality of battery cells 1 are stacked along a first direction to form a plurality of battery cell groups continuously arranged along the first direction. Each battery cell group includes two battery cells 1. The battery cells 1 have a first pole 11 and a second pole 12 located on the same side along a third direction. Along the second direction, the first poles 11 of the two battery cells 1 in each battery cell group are arranged on the same side, and the first poles 11 of the battery cells 1 in two adjacent battery cell groups are arranged on different sides, and the first pole 11 and the second pole 12 are at different distances from the center plane of the battery cell 1. The first direction, the second direction and the third direction are perpendicular to each other.

[0031] The first end of the bar piece 2 is connected to the first pole 11 of a battery cell 1 in one battery cell group, and the second end of the bar piece 2 is connected to the second pole 12 of a battery cell 1 in another battery cell group, wherein one battery cell group is arranged adjacent to another battery cell group; and the bar pieces 2 located in the middle along the first direction are arranged in pairs, and the first ends of the two bar pieces 2 arranged in pairs are respectively connected to the first poles 11 of two battery cells 1 in the same battery cell group, and the second ends of the two bar pieces 2 arranged in pairs are respectively connected to the second poles 12 of battery cells 1 in different battery cell groups.

[0032] The bar pieces 2 located in the middle along the first direction refer to all the bar pieces 2 except the two bar pieces 2 located at the two ends along the first direction, that is, the bar pieces 2 located at the two ends along the first direction are not arranged in pairs, while the bar pieces 2 located in the middle of the bar pieces 2 located at the two ends along the first direction are arranged in pairs.

[0033] Specifically, the second end of one of the two bar pieces 2 arranged in pairs is connected to the second pole 12 of the battery cell 1 in one of the battery cell groups adjacent to the battery cell group, and the second end of the other bar piece 2 of the two bar pieces 2 arranged in pairs is connected to the second pole 12 of the battery cell 1 in the other battery cell group adjacent to the battery cell group. In this embodiment, the structures of all bar pieces 2 can be the same or different, and multiple battery cells 1 can be connected in series.

[0034] The first direction is Figure 1 The middle X direction (i.e. the thickness direction of the battery cell 1), the second direction is Figure 1 The Y direction (i.e. the width direction of the battery cell 1) and the third direction are Figure 1 In the Z direction (i.e., the height direction of the battery cell 1).

[0035] It can be understood that the first pole 11 and the second pole 12 correspond to the positive pole and the negative pole of the battery cell 1, respectively, that is, when the first pole 11 is the positive pole, the second pole 12 is the negative pole; when the first pole 11 is the negative pole, the second pole 12 is the positive pole. That is, along the second direction, the positive poles of the two battery cells 1 in the same battery cell group are located on the same side, the negative poles of the two battery cells 1 are located on the same side, and the positive and negative poles of the battery cells 1 of the two adjacent battery cell groups are arranged on different sides.

[0036] In this embodiment, when the tabs 2 connect the first poles 11 and the second poles 12 of the battery cells 1 of two adjacent battery cell groups, the tabs 2 arranged in pairs will be connected alternately. Since the distances between the first pole 11 and the second pole 12 and the center plane of the battery cell 1 are different along the second direction, and the positive and negative poles of the battery cells 1 in the two adjacent battery cell groups are arranged on different sides, when the paired tabs 2 are connected, there will be no situation where one tab 2 blocks the electrode of the other tab 2, thereby facilitating the subsequent welding between the tabs 2 and the battery cells 1.

[0037] Furthermore, at least a portion of the two tabs 2 arranged in pairs are overlapped along the third direction. At least a portion of the two tabs 2 arranged in pairs overlap along the height direction of the battery cell 1, which is conducive to convenient installation and improved installation stability.

[0038] Furthermore, the bar 2 includes an intermediate plate segment 21, a bent plate segment 22 and a connecting plate segment 23. The connecting plate segments 23 are arranged in pairs. The two connecting plate segments 23 arranged in pairs are respectively bent and formed on the two side surfaces of the intermediate plate segment 21 by the bent plate segments 22. The connecting plate segments 23 arranged in pairs are respectively located at the first end and the second end of the bar 2, and are respectively used to connect with the first pole 11 and the second pole 12.

[0039] In this embodiment, the length of the bent plate segment and the bending direction (i.e., the extension direction of the bent plate segment 22 from the middle plate segment 21 to the connecting plate segment 23) of each bar 2 in the battery module can be the same or different, and can be adaptively designed according to the actual layout, and no restrictions are imposed here.

[0040] Preferably, the middle plate segment 21 , the bent plate segment 22 and the two connecting plate segments 23 are formed into a substantially L-shaped structure.

[0041] In this embodiment, the connecting plate segment 23 is connected to the first pole 11 or the second pole 12 of the battery cell 1. Since the first pole 11 and the second pole 12 are at different distances from the center plane of the battery cell 1 along the second direction, the bar piece 2 wants to connect the first pole 11 and the second pole 12 of different battery cells 1, and the two connecting segments of the bar piece 2 are located on different straight lines. Therefore, in order to better connect the first pole 11 and the second pole 12 of different battery cells 1, the bar piece 2 is roughly an L-shaped structure.

[0042] Furthermore, the projections of the middle plate sections 21 of the two bar sheets 2 arranged in a pair along the third direction at least partially overlap.

[0043] Furthermore, the middle plate section 21 of one of the two bar sheets 2 arranged in a pair is located on a side of the middle plate section 21 of the other bar sheet 2 facing the battery cell 1 .

[0044] By setting the middle plate section 21 of one bar piece 2 on the side of another bar piece 2 facing the battery cell 1, the middle plate sections 21 of the two bar pieces 2 can be overlapped in the height direction, which can facilitate the arrangement of the bar pieces 2 and reduce the interference between the bar pieces 2 caused by the layout.

[0045] Furthermore, in the two tabs 2 arranged in pairs, the tab 2 whose middle plate section 21 is located on the side away from the battery cell 1 has a bent plate section 22 bent toward the battery cell 1, and the tab 2 whose middle plate section 21 is located on the side close to the battery cell 1 has a bent plate section 22 bent toward the direction away from the battery cell 1. The tabs 2 have different bending directions, and adopting this bending direction can reduce the space occupied in the height direction.

[0046] like Figure 1 and Figure 2 As shown, the battery module further includes output tabs 3 arranged in pairs, and two output tabs 3 are arranged along the first direction on one side of the plurality of battery cells 1 for outputting electricity to the outside. The output tabs 3 serve as the output poles of the entire battery module, and the output tabs 3 arranged in pairs are located on the same side of the plurality of battery cells 1, which can realize the same-side output of the entire battery module, thereby improving the space utilization rate of the battery module when applied to a battery pack.

[0047] Furthermore, the two output bars 3 are electrically connected to the first pole 11 of one battery cell 1 and the second pole 12 of another battery cell 1 in the same battery cell group, respectively.

[0048] It is particularly noted that the two output bars 3 are respectively used to connect two different battery cells 1 , and the structures of the two output bars 3 are different.

[0049] like Figure 5 As shown, the battery module also includes a side tab 4, which is arranged on the other side of the multiple battery cells 1 along the first direction, one end of the side tab 4 is connected to the first pole 11 of a battery cell 1 in the same battery cell group, and the other end of the side tab 4 is connected to the second pole 12 of another battery cell 1 in the battery cell group.

[0050] Furthermore, the opposite side bar 4 includes a first plate segment 41, a second plate segment 42 and a third plate segment 43. The first plate segment 41 is connected to the first pole 11, the second plate segment 42 is connected to the second pole 12, the first plate segment 41 and the second plate segment 42 are coplanar, the third plate segment 43 is bent and formed on the same side of the first plate segment 41 and the second plate segment 42, and the third plate segment 43 is located outside the plurality of battery cells 1 along the first direction.

[0051] Specifically, in order to cooperate with the same-side output of the electrodes of the battery module, a different-side bar plate 4 is arranged on the side of the multiple battery cells 1 away from the output bar plate 3. The different-side bar plate 4 connects the two electrodes. The different-side bar plate 4 cooperates with the bar plate 2 to realize the electrical connection path of the entire battery module, thereby facilitating the electrical output of the entire battery module.

[0052] Furthermore, the battery module further includes an insulating layer, and along the third direction, the insulating layer is provided on the overlapping portion of the opposite side bar sheet 4 and the bar sheet 2. Specifically, the insulating layer can be provided on the opposite side bar sheet 4, or on the bar sheet 2, or on both the opposite side bar sheet 4 and the bar sheet 2.

[0053] Furthermore, the battery module further includes an insulating layer, and along the third direction, an insulating layer is provided on the overlapping portion of the output bar sheet 3 and the bar sheet 2. Specifically, the insulating layer can be provided on the output bar sheet 3, or on the bar sheet 2, or on both the output bar sheet 3 and the bar sheet 2.

[0054] Furthermore, the battery module further includes an insulating layer, and along the third direction, the insulating layer is provided on the overlapping portion between the tabs 2. Specifically, the insulating layer can be provided on one of the two tabs 2 having the overlapping portion, or on both tabs 2.

[0055] In this embodiment, the insulating layer plays an insulating role. When, for example, two sheets 2 are stacked vertically, if there is no insulating layer on the surface of the sheet 2, a short circuit is likely to occur. Therefore, an insulating layer needs to be provided on the surface of the overlapping portion of the sheet 2 to avoid a short circuit.

[0056] In this embodiment, the battery module further includes an explosion-proof valve 5, which is arranged on the same side of the battery cell 1 as the first pole 11 and the second pole 12, and the explosion-proof valve 5 and the bar sheet 2 do not overlap along the third direction. Thus, interference between the explosion-proof valve 5 and the bar sheet 2 can be avoided, that is, the bar sheet 2 can be prevented from blocking substances ejected through the explosion-proof valve 5, and the high-temperature substances ejected from the explosion-proof valve 5 can be prevented from damaging the bar sheet 2.

[0057] Embodiment 2

[0058] This embodiment provides a battery pack, including the battery module in the first embodiment.

[0059] From the above description, it can be seen that the above embodiments of the utility model achieve the following technical effects:

[0060] 1. By setting the distances between the two poles of the battery cell 1 and the center of the battery cell 1 to be different, when installing the bar pieces 2, the mutual interference between the bar pieces 2 can be reduced, which facilitates the installation of the bar pieces 2, and the bar pieces 2 are distributed neatly, simplifying the FPC structure design.

[0061] 2. The two output bars 3 of the battery module can be located on the same side of the module, which simplifies the arrangement of battery pack parts and improves space utilization.

[0062] Obviously, the embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0063] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0064] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0065] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A battery module, characterized in that: include: A plurality of battery cells (1), wherein the plurality of battery cells (1) are stacked along a first direction to form a plurality of battery cell groups arranged continuously along the first direction, each of the battery cell groups comprising two of the battery cells (1); The battery cell (1) has a first pole (11) and a second pole (12) located on the same side along a third direction; along the second direction, the first poles (11) of the two battery cells (1) in each battery cell group are arranged on the same side, and the first poles (11) of the battery cells (1) in two adjacent battery cell groups are arranged on different sides, and the first pole (11) and the second pole (12) are at different distances from the center plane of the battery cell (1); wherein the first direction, the second direction and the third direction are perpendicular to each other; A bar sheet (2), wherein the first end of the bar sheet (2) is connected to the first pole (11) of a battery cell (1) in one battery cell group, and the second end of the bar sheet (2) is connected to the second pole (12) of a battery cell (1) in another battery cell group, wherein the one battery cell group is arranged adjacent to the other battery cell group; and along the first direction, the bar sheets (2) located in the middle are arranged in pairs, the first ends of the two bar sheets (2) arranged in pairs are respectively connected to the first poles (11) of the two battery cells (1) in the same battery cell group, and the second ends of the two bar sheets (2) arranged in pairs are respectively connected to the second poles (12) of the battery cells (1) in different battery cell groups.

2. The battery module according to claim 1, characterized in that: At least a portion of the two bar sheets (2) arranged in a pair is overlapped along the third direction.

3. The battery module according to claim 1, characterized in that: The bar sheet (2) comprises: Middle plate section (21); Bending plate segment (22); The connecting plate segments (23) are arranged in pairs, and the two connecting plate segments (23) arranged in pairs are respectively bent and formed on the two side surfaces of the middle plate segment (21) by the bending plate segments (22). The connecting plate segments (23) arranged in pairs are respectively located at the first end and the second end of the bar (2), and are respectively used to connect with the first pole (11) and the second pole (12).

4. The battery module according to claim 3, characterized in that: The projections of the middle plate sections (21) of the two bar sheets (2) arranged in a pair along the third direction at least partially overlap.

5. The battery module according to claim 4, characterized in that: In the two tabs (2) arranged in pairs, the bent plate section (22) of the tab (2) on the side where the middle plate section (21) is located away from the battery cell (1) is bent in a direction close to the battery cell (1), and the bent plate section (22) of the tab (2) on the side where the middle plate section (21) is located close to the battery cell (1) is bent in a direction away from the battery cell (1).

6. The battery module according to claim 1, characterized in that: The battery module also includes: Output tabs (3) arranged in pairs, two of the output tabs (3) being arranged on one side of the plurality of battery cells (1) along a first direction, and the two output tabs (3) being electrically connected to a first pole (11) of one of the battery cells (1) and a second pole (12) of another of the battery cells (1) in the same battery cell group, respectively; A different side tab (4), the different side tab (4) being arranged along a first direction on the other side of the plurality of battery cells (1), one end of the different side tab (4) being connected to a first pole (11) of one of the battery cells (1) in the same battery cell group, and the other end of the different side tab (4) being connected to a second pole (12) of another of the battery cells (1) in the battery cell group.

7. The battery module according to claim 6, characterized in that: The opposite side blade (4) comprises: A first plate segment (41), the first plate segment (41) being connected to the first pole (11); A second plate segment (42), the second plate segment (42) being connected to the second pole (12), the first plate segment (41) and the second plate segment (42) being coplanar; A third plate segment (43), the third plate segment (43) is bent and formed on the same side of the first plate segment (41) and the second plate segment (42), and the third plate segment (43) is located outside the plurality of battery cells (1) along a first direction.

8. The battery module according to claim 6, characterized in that: Along the third direction, An insulating layer is provided at the overlapping portion of the opposite side bar sheet (4) and the bar sheet (2); and / or An insulating layer is provided at the overlapping portion of the output bar sheet (3) and the bar sheet (2); and / or An insulating layer is provided at the overlapping portions between the bars (2).

9. The battery module according to any one of claims 1 to 8, characterized in that: The battery module further comprises an explosion-proof valve (5), wherein the explosion-proof valve (5) and the first pole (11) and the second pole (12) are arranged on the same side of the battery cell (1), and the explosion-proof valve (5) and the bar plate (2) do not overlap along a third direction.

10. A battery pack, characterized in that: A battery module comprising any one of claims 1 to 9.

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