Battery module and battery pack

Abstract

Disclosed in the present application are a battery module and a battery pack. The battery module comprises a battery cell group and an end plate assembly, wherein the end plate assembly comprises an end plate, an output electrode base, an output electrode connecting bar and a protective cover. The output electrode connecting bar comprises a first connecting portion and a second connecting portion. The first connecting portion is arranged on the side of the output electrode base close to the top surface, and the second connecting portion is bent once from the side of the output electrode base close to the top surface to the side of the output electrode base close to the side surface and is connected to the output electrode base.

Description

Battery modules and battery packs

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on August 31, 2023, with application number 202322365743.6. The entire contents of the above application are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a battery module and a battery pack. Background Art

[0003] The output pole of a battery module typically includes an exposed metal output pole connecting bar structure, which is fixed to the output pole base. In related art, the output pole base is fixed to the end plate. One end of the output pole connecting bar is connected to the battery pole, and the other end is connected and fixed to the output pole base. The output pole connecting bar usually needs to be bent multiple times from the side of the battery module pole to the side of the output pole base away from the end plate to be installed and fixed to the output pole base. The multiple bends in the output pole connecting bar not only increase the length of the connecting bar, resulting in increased costs, but also occupy space within the battery pack, resulting in insufficient space for electrical connections between adjacent battery modules. SUMMARY OF THE INVENTION

[0004] The present application provides a battery module and a battery pack to solve the above technical problems.

[0005] In a first aspect, the present application provides a battery module, comprising:

[0006] A battery cell group, comprising a plurality of battery cells, the plurality of battery cells being arranged along a first direction, the battery cell group having two opposite end surfaces along the first direction, the battery cell group having two opposite side surfaces along a second direction, the battery cell group having opposite top and bottom surfaces along a third direction, the top surface being provided with a pole, the first direction being perpendicular to the second direction, and the third direction being perpendicular to both the first and second directions;

[0007] End plate assembly, including end plate, output pole base, output pole connecting bar and protective cover;

[0008] The end plate is arranged on the end surface;

[0009] The output pole base is arranged on a side of the end plate away from the battery cell group;

[0010] The output pole connection bar includes a first connection portion and a second connection portion connected to the first connection portion, wherein the first connection portion is provided on a side of the output pole base close to the top surface, and the second connection portion is bent once from the side of the output pole base close to the top surface to the side of the output pole base close to the side surface and connected to the output pole base;

[0011] The protection cover is disposed on a side of the output pole base close to the side surface and covers at least a portion of the second connecting portion.

[0012] In a second aspect, the present application provides a battery pack comprising the battery module as described in the first aspect. Beneficial effects

[0013] The beneficial effects of the present application are as follows: the present application provides a battery module and a battery pack, wherein the output pole connection bar of the battery module includes a first connection portion and a second connection portion, and the first connection portion is arranged on a side of the output pole base close to the top surface of the battery cell group, and the second connection portion is bent toward the side of the output pole base close to the side of the battery cell group and connected to the output pole base through a single bend, so that the output pole connection bar and the pole are located on the same side, and the output pole connection bar is located as a whole on the side of the output pole base, so as to avoid the problems of increased material length, increased cost, insufficient space, etc. caused by the output pole connection bar being bent multiple times to the side of the output pole base away from the end plate and then connected to the output pole base. By improving the output pole connection structure, the present application can effectively reduce the production cost of the battery module, save space, and improve the assembly efficiency of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] FIG1 is a schematic structural diagram of a battery module provided by the related art;

[0015] Figure 2 is a schematic structural diagram of a battery module provided in an embodiment of the present application;

[0016] FIG3 is a partial cross-sectional view of a battery module provided by the embodiment of FIG2 along a first direction;

[0017] FIG4 is a partial cross-sectional view of a battery module provided by the embodiment of FIG2 along a third direction.

[0018] Description of reference numerals:

[0019] 100-battery cell group, 101-first end face, 102-first side face, 103-top face, 110-battery cell, 111-pole, 200-end plate assembly, 210-end plate, 211-clip, 220-output pole base, 221-first surface, 222-first side, 223-third side, 224-plug-in slot, 230-output pole connecting row, 231-first connecting part, 232-second connecting part, 240-protective cover, 241-first side wall, 242-opening, 243-elastic plug-in part, 244-slot, 250-bolt, 251-first screw hole, 252-second screw hole. Modes for Carrying Out the Invention

[0020] As shown in FIG1 , which is a schematic structural diagram of a battery module provided in the related art, the battery module includes a battery cell group 100 and an end plate assembly 200 .

[0021] The battery cell group 100 includes a plurality of battery cells 110, which are arranged along a first direction. The battery cell group 100 has two opposing end surfaces along the first direction, two opposing side surfaces along the second direction, and a top surface 103 and a bottom surface along a third direction. The top surface 103 is provided with a pole 111. The first direction is perpendicular to the second direction, and the third direction is perpendicular to both the first and second directions. The first direction is the X direction in the figure, the second direction is the Y direction in the figure, and the third direction is the Z direction in the figure.

[0022] The end plate assembly 200 includes an end plate 210, an output pole base 220, an output pole connecting bar 230, and a protective cover 240. The end plate 210 is arranged on the end surface; the output pole base 220 is arranged on the side of the end plate 210 away from the battery cell group 100; one end of the output pole connecting bar 230 is electrically connected to the pole 111 and extends toward the output pole base 220 in a first direction, then bends toward the side of the output pole base 220 away from the end plate 210 and extends along a third direction, then bends toward the side of the output pole base 220 close to the side of the battery cell group and is bolted to the output pole base 220; the protective cover 240 is arranged on the side of the output pole base 220 close to the side and covers the connection portion between the output pole connecting bar 230 and the output pole base 220.

[0023] In the above-mentioned related technologies, the output pole connecting bar 230 is bent multiple times to the side of the output pole base 220 away from the end plate 210 and then connected to the output pole base 220, resulting in an increase in the usable length of the output pole connecting bar 230, causing an increase in the manufacturing cost of the battery module. At the same time, the output pole connecting bar 230 is folded to the side of the output pole base 220 away from the end plate 210, occupying the space between the modules, resulting in insufficient electrical connection space between the battery modules.

[0024] To solve the above problems, the present application provides a battery module and a battery pack.

[0025] As shown in Figure 2, it is a schematic diagram of the structure of a battery module provided by this application. The battery module includes:

[0026] The battery cell group 100 includes a plurality of battery cells 110, which are arranged along a first direction. The battery cell group 100 has two opposite end surfaces along the first direction, the battery cell group 100 has two opposite side surfaces along the second direction, and the battery cell group 100 has a top surface 103 and a bottom surface relative to each other along a third direction. The top surface 103 is provided with a pole 111. The first direction, the second direction and the third direction are perpendicular to each other.

[0027] The end plate assembly 200 includes an end plate 210, an output pole base 220, an output pole connection bar 230, and a protective cover 240. The end plate 210 is disposed on the end surface; the output pole base 220 is disposed on a side of the end plate 210 away from the battery cell group 100; the output pole connection bar 230 includes a first connection portion 231 and a second connection portion 232 connected to the first connection portion 231. The first connection portion 231 is disposed on a side of the output pole base 220 close to the top surface 103, and the second connection portion 232 is bent from the side of the output pole base 220 close to the top surface 103 to the side of the output pole base 220 close to the side and connected to the output pole base 220; the protective cover 240 is disposed on a side of the output pole base 220 close to the side and covers at least a portion of the second connection portion 232.

[0028] Specifically, as shown in FIG2 , the cell group 100 has a first end face 101 and a second end face that are opposite to each other along a first direction, a first side face 102 and a second side face that are opposite to each other along a second direction, and a top face 103 and a bottom face that are opposite to each other along a third direction. The output pole base 220 has a first surface 221 and a second surface that are opposite to each other along the first direction, a first side 222 and a second side that are opposite to each other along the second direction, and a third side 223 and a fourth side that are opposite to each other along the third direction, wherein the second surface is in contact with the first end face 101, the first side 222 is close to the first side face 102, and the third side 223 is close to the top face 103.

[0029] The output pole connection bar 230 includes a first connection portion 231 for connecting to the pole 111 and a second connection portion 232 for connecting to the output pole base 220. The first connection portion 231 is located on the third side 223 of the output pole base 220, on the same side as the pole 111. The second connection portion 232 is located on the first side 222 of the output pole base 220 and is fixed to the first side 222 of the output pole base 220.

[0030] Because the protective cover arranged longitudinally (in the Y direction) in the related art is difficult to install and fix, and the installation of the protective cover needs to meet the international electrical protection level IPXXB, the output stage connection bar of the battery module is usually installed in a horizontal manner. However, the horizontal installation requires the output stage connection bar to be bent multiple times, thereby increasing the length of the output stage connection bar and increasing the cost. In the present application, by arranging the main portion of the output pole connection bar 230, that is, the first connecting portion 231, on the third side 223 on the same side as the pole 111, the number of bends of the first connecting portion 231 is reduced, thereby shortening the length of the first connecting portion 231 connecting the pole 111 and the output pole base 220, and avoiding the problem of increased material length and increased cost caused by the output pole connection bar 230 being bent from the third side 223 of the output pole base 220 to the first surface 221 and then to the first side 222 in the related art. At the same time, the second connecting portion 232 connecting the first connecting portion 231 to the output pole base 220 is bent directly from the third side 223 to the first side 222. This single bend allows the first connecting portion 231 to be connected to the output pole base 220, eliminating the need for the first connecting portion 231 to bend to the first side 222 and then connect to the output pole base 220, thereby reducing the number of bends. In the present application, the second connecting portion 232 is connected to the first connecting portion 231 in an L-shape, and the output pole connecting bar 230 is integrally disposed on the side portions of the output pole base 220 (i.e., the third side 223 and the first side 222). This prevents the output pole connecting bar 230 from being mounted on the first surface 221 of the output pole base 220, thereby preventing the output pole connecting bar 230 from occupying space between modules, which in turn leads to insufficient electrical connection space between battery modules.

[0031] Furthermore, an aluminum bar is provided on the pole 111, the aluminum bar is electrically connected to the pole 111, and the output pole connecting bar 230 is welded to the aluminum bar to achieve electrical connection with the pole 111. In the embodiment of the present application, the output pole connecting bar 230 can be a copper bar, but is not limited thereto.

[0032] In one embodiment, the output pole base 220 is arranged at one end of the end plate 210 close to the pole 111 to reduce the length of the output pole connecting bar 230 and reduce costs, while facilitating the connection between the output pole connecting bar 230 and the pole 111 and the output pole base 220.

[0033] Furthermore, the third side 223 of the output pole base 220 can be located in the same plane as the top surface 103 of the battery cell group 100, and the first connecting portion 231 extends along the first direction and is electrically connected to the pole 111, so that the first connecting portion 231 does not produce a bending portion, reducing the connection length of the first connecting portion 231 and further reducing costs.

[0034] In one embodiment, the output pole base 220 is an integral structure with the end plate 210. Specifically, the end plate 210 may be a plastic structure. During the manufacture of the end plate 210, the output pole base 220 and the end plate 210 may be integrally molded together to form a single unitary structure. The output pole base 220 is integrated with the end plate 210, and the integrated end plate 210 provides a fixed interface, thereby further improving the connection stability of the output pole connecting bar 230.

[0035] In one embodiment, the second connection portion 232 is bolted to the output pole base 220 to facilitate disassembly of the output pole connection bar 230 for maintenance or replacement.

[0036] As shown in Figure 2, a first screw hole 251 is provided on the second connecting portion 232, and a second screw hole 252 is provided on the first side 222 of the output pole base 220. By passing the bolt 250 through the first screw hole 251 and the second screw hole 252 in sequence, the second connecting portion 232 is fixed to the first side 222, thereby achieving a fixed connection between the output pole connecting bar 230 and the output pole base 220.

[0037] It should be noted that the second connecting portion 232 and the output pole base 220 may also be connected in other ways, such as welding, but is not limited thereto.

[0038] To protect the connection between the output pole connecting bar 230 and the output pole base 220, a protective cover 240 is typically provided at the connection to meet the electrical protection level requirements of the battery module. As shown in FIG2 , the protective cover 240 is provided on the first side 222 of the output pole base 220 and covers the second connection portion 232.

[0039] In one embodiment, the protection cover 240 and the end plate 210 can be connected by snap fastening.

[0040] Specifically, as shown in Figures 2 to 4, the protective cover 240 has a first side wall 241 on the side close to the end plate 210, and an opening 242 is provided at one end of the first side wall 241 of the protective cover 240 close to the top surface 103. The end of the end plate 210 close to the top surface 103 is provided with a buckle 211, and the buckle 211 is inserted into the opening 242 to fix the protective cover 240 to the end plate 210.

[0041] In one embodiment, the protection cover 240 is elastically connected to the output pole base 220 .

[0042] Specifically, as shown in Figures 2 and 4, an elastic plug-in portion 243 is provided at one end of the protective cover 240 away from the top surface 103, and an inserting groove 224 is provided at one end of the output pole base 220 facing the protective cover 240. The elastic plug-in portion 243 is inserted into the inserting groove 224 to fix the protective cover 240 to the output pole base 220.

[0043] Furthermore, as shown in Figure 4, the elastic plug-in portion 243 is a U-shaped elastic member, one end of the U-shaped elastic member is connected to the protective cover 240, and the other end is a free end. The opening of the U-shaped elastic member faces the first side surface 102, and the bottom of the U-shaped elastic member extends into the plug-in slot 224. A card slot 244 is provided on the outer side wall of the U-shaped elastic member, and the edge of the opening of the plug-in slot 224 is clamped at the card slot 244 to enable the U-shaped elastic member to be clamped and fixed to the plug-in slot 224, thereby realizing a fixed connection between the protective cover 240 and the output pole base 220.

[0044] The present application also provides a battery pack, which includes a box and a plurality of battery modules as described above, wherein the plurality of battery modules are arrayed in the box.

[0045] The embodiments of the present application provide a battery module and battery pack, wherein the output pole connection bar of the battery module includes a first connection portion and a second connection portion. The first connection portion is arranged on a side of the output pole base close to the top surface of the battery cell group, and the second connection portion is bent toward the side of the output pole base close to the side of the battery cell group and connected to the output pole base through a single bend, so that the output pole connection bar and the pole are located on the same side, and the output pole connection bar is located as a whole on the side of the output pole base, so as to avoid the problems of increased material length, increased cost, insufficient space, etc. caused by the output pole connection bar being bent multiple times to the side of the output pole base away from the end plate and then connected to the output pole base. By improving the output pole connection structure, the present application can effectively reduce the production cost of the battery module, save space, and improve the assembly efficiency of the battery module.

Claims

1. A battery module, comprising: A battery cell group (100) comprises a plurality of battery cells (110), wherein the plurality of battery cells (110) are arranged along a first direction, the battery cell group (100) has two opposite end surfaces along the first direction, the battery cell group (100) has two opposite side surfaces along a second direction, the battery cell group (100) has an opposite top surface (103) and bottom surface along a third direction, the top surface (103) is provided with a pole (111), the first direction is perpendicular to the second direction, and the third direction is perpendicular to the first direction and the second direction; An end plate assembly (200) comprises an end plate (210), an output pole base (220), an output pole connection row (230) and a protective cover (240); The end plate (210) is arranged on the end surface; The output pole base (220) is arranged on a side of the end plate (210) away from the battery cell group (100); The output pole connection row (230) comprises a first connection portion (231) and a second connection portion (232) connected to the first connection portion (231), wherein the first connection portion (231) is arranged on a side of the output pole base (220) close to the top surface (103), and the second connection portion (232) is bent once from a side of the output pole base (220) close to the top surface (103) to a side of the output pole base (220) close to the side surface and connected to the output pole base (220); The protective cover (240) is arranged on a side of the output pole base (220) close to the side surface and covers at least a portion of the second connecting portion (232).

2. The battery module according to claim 1, wherein: The protective cover (240) is snap-connected to the end plate (210).

3. The battery module according to claim 2, wherein: An opening (242) is provided at one end of the protective cover (240) close to the top surface (103), and a buckle (211) is provided at one end of the end plate (210) close to the top surface (103), and the buckle (211) is inserted into the opening (242) so that the protective cover (240) is fixedly connected to the end plate (210).

4. The battery module according to claim 3, wherein: The protection cover (240) is elastically connected to the output pole base (210).

5. The battery module according to claim 4, wherein: An elastic plug-in portion (243) is provided at one end of the protective cover (240) away from the top surface (103), and an inserting groove (224) is provided at one end of the output pole base (220) facing the protective cover (240), and the elastic plug-in portion (243) is inserted into the inserting groove (224) so ​​that the protective cover (240) is fixedly connected to the output pole base (220).

6. The battery module according to any one of claims 1 to 5, wherein: The output pole base (220) and the end plate (210) are an integral structure.

7. The battery module according to any one of claims 1 to 5, wherein: The output pole base (220) is arranged at one end of the end plate (210) close to the pole (111).

8. The battery module according to any one of claims 1 to 5, wherein: The first connection portion (231) extends along the first direction and is electrically connected to the pole (111).

9. The battery module according to any one of claims 1 to 5, wherein: The second connection portion (231) is bolted to the output pole base (220).

10. A battery pack, comprising the battery module according to any one of claims 1 to 9.

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