JP7322159B2 - Battery module manufacturing method and battery pack manufacturing method - Google Patents

Description

cross reference

This application is based on Chinese Patent Application No. 201910173001.9 filed on March 7, 2019 entitled "Battery Module and Battery Pack" and entitled "Battery Module and Battery Pack" filed on March 20, 2019. It is based on Chinese patent application 201910212474.5, the entire disclosure of which is incorporated herein by reference.

TECHNICAL FIELD The present invention relates to the field of battery technology, and more particularly to a method for manufacturing a battery module and a method for manufacturing a battery pack.

Secondary batteries have advantages such as high energy density, long life, energy saving, and environmental friendliness, and are widely used in various fields such as new energy vehicles and energy storage power plants.

the battery module includes a battery cell array structure, a busbar, an upper cover and a lower cover, the battery cell array structure includes a plurality of battery cells and a plurality of busbars electrically connected to the plurality of battery cells; A battery cell array structure is housed in a housing cavity surrounded by an upper cover and a lower cover. When assembling the battery module, firstly, a plurality of battery cells are fixed and connected to a plurality of busbars to form a battery cell array structure, and then the battery cell array structure is moved into the receiving cavity to form the battery cell array structure. Additional transfer components need to be installed in the battery module, which reduces the energy density of the battery module.

Therefore, when assembling a battery module, generally, a plurality of battery cells are first put into the receiving cavity one by one, and the plurality of battery cells are fixed and then connected to the plurality of bus bars. However, when the battery module has a plurality of battery cell array structures and the distance between the plurality of battery cell array structures is short, it becomes very difficult to connect the busbars (at this time, the fixtures to be connected to the busbars are difficult to connect). no operating space).

Therefore, there is a need to provide a battery module and a battery pack to solve the technical problems of the prior art.

To achieve the above objectives, the present inventor provides a battery module, the battery module having a battery cell array structure including a plurality of battery cells and a plurality of bus bars electrically connected to the plurality of battery cells. , a first cover and a second cover, the first cover being connected to the second cover, the battery cell array structure being provided between the first cover and the second cover, wherein the first cover includes a first supporting part and a second supporting part, the first supporting part and the second supporting part are split structures, the battery module includes two or more battery cell array structures, one of which is a battery cell array The structure is a first battery cell array structure, the other battery cell array structure is a second battery cell array structure, the first battery cell array structure is installed opposite the first support, and the second battery cell array structure is The cell array structure is installed to face the second support. The first support part and the second support part have, for example, a flat structure covering the battery cell array structure.

In addition, the second cover includes a first lower cover and a second lower cover, the first lower cover and the second lower cover have a split structure, and the first support part and the first lower cover are connected to the first battery cell. respectively positioned on both sides of the array structure, and the first support is positioned above the first lower cover, and/or the second support and the second lower cover are positioned on both sides of the second battery cell array structure. respectively, and the second support is positioned above the second lower cover.

A first receiving cavity is formed between the first support and the first lower cover, and the first battery cell array structure is provided in the first receiving cavity and/or with the second support. A second receiving cavity is formed between the second lower cover, and a second battery cell array structure is provided in the second receiving cavity.

The first support and the second support are connected by welding, riveting, adhesive bonding or bolting, and/or the first lower cover and the second lower cover are connected by , welded, riveted, glued or bolted.

Also, the battery module further includes a fixing member, and the first lower cover is connected to the second lower cover via the fixing member.

Also, the fixing member is a water cooling plate, and the first lower cover and the second lower cover are respectively fixed to the fixing member with a thermally conductive adhesive.

Also, the first battery cell array structure is fixed to the first lower cover by an adhesive, and the second battery cell array structure is fixed to the second lower cover by an adhesive.

A first opening is provided at one end of the first receiving cavity facing the second receiving cavity, and a second opening is provided at one end of the second receiving cavity facing the first receiving cavity. The opening and the second opening face each other.

In addition, the battery module further includes a vertically provided first connecting portion, the first connecting portion being located on a side of the first battery cell array structure away from the second battery cell array structure, and a first supporting portion. (131) is connected with the first lower cover through the first connection, and/or the battery module further includes a second connection vertically provided, the second connection being connected to the second battery The second support part is located on the side of the cell array structure away from the first battery cell array structure and connects with the second lower cover through the second connecting part .

Also, the battery cell includes a battery case, a cover plate and an electrode terminal, the cover plate connected to the battery case, the electrode terminal provided on the cover plate and electrically connected to the busbar, a first battery cell array The electrode terminals of the structure face or face the second battery cell array and/or the electrode terminals of the second battery cell array face the first battery cell array, or Head to the other side.

In addition, the battery module further includes a vertically provided first connecting portion, the first connecting portion being located on a side of the first battery cell array structure away from the second battery cell array structure, and the first battery cell The electrode terminals of the array face the second battery cell array, and/or the battery module further includes a vertically disposed second connecting portion , the second connecting portion facing the second battery cell array. and the electrode terminals of the second battery cell array face the first battery cell array.

In addition, the battery module includes three or more battery cell arrays, another battery cell array is a third battery cell array, and the third battery cell array is the first battery cell array and the second battery cell array. The first cover further includes a third support provided between the battery cell array structure, and the third battery cell array structure is installed to face the third support.

One end of the third support is fixed to the first support, and the other end of the third support is fixed to the second support.

Also, the first cover further includes a first fixing part and a second fixing part, the first fixing part being connected to the first supporting part and extending away from the first supporting part, and the second fixing part being , is connected to the second support and extends away from the second support, the second cover includes a main board, a third fixing part and a fourth fixing part, the third fixing part and the fourth fixing part are respectively connected to both ends of the main board, the first fixing part and the third fixing part are installed oppositely and fixedly connected, and the second fixing part and the fourth fixing part are installed oppositely and fixed Connecting.

Also, the battery cell includes an electrode assembly and a battery case, the electrode assembly being housed within the battery case, the electrode assembly comprising a first pole piece, a second pole piece, and a first pole piece and a second pole piece. The electrode assembly is of a wound structure and flat shape, the outer surface of the electrode assembly includes two flat surfaces, the two flat surfaces facing vertically, or , the electrode assembly is a laminated structure, wherein the first pole piece, the diaphragm and the second pole piece are vertically stacked.

The battery module also includes a vertically mounted collection board, which connects with the battery cells.

Also, the first battery cell array structure is fixed to the first support by an adhesive, and the second battery cell array structure is fixed to the second support by an adhesive.

Also, the first support portion and the second support portion are connected by welding, riveting, or adhesive bonding.

Also, the battery module further includes a fixing member, and the first support is connected to the second support through the fixing member.

Also, the fixing member is a water-cooled plate, and the first supporting part and the second supporting part are each fixed to the fixing member with a thermally conductive adhesive.

Unlike the prior art, the first cover includes a first support and a second support, and the first support and the second support are split structures. Therefore, the plurality of battery cells are sequentially put into the first support, so that the plurality of battery cells are fixed to the first support, and then connected to the plurality of bus bars and transferred using the first support. . Similarly, the same effect can be achieved by placing a plurality of battery cells into the second support in sequence. At this time, since the transfer is performed using the first cover , no additional parts are required, thereby improving the energy density of the battery module. That is, the present inventor provides a method of manufacturing a battery module in which a first support to which a plurality of battery cells are fixed and a second support to which a plurality of battery cells are fixed are housed in a second cover.

To achieve the above objects, the inventor provides a battery pack, the battery pack comprising a storage box and a plurality of batteries of any one of the above provided by the inventors installed in the storage box. Contains modules. That is, the present inventor provides a method of manufacturing a battery pack including battery modules manufactured by the above method.

Also, the first cover includes a first fixing part and a second fixing part, the first fixing part is connected to the first support part, the second fixing part is connected to the second support part, and the second cover is includes a main board, a third fixing part and a fourth fixing part, the third fixing part and the fourth fixing part are respectively connected to both ends of the main board, and the storage box includes a box cover and a box body , the box body is provided with a first fixed beam and a second fixed beam, the first fixed beam and the second fixed beam protrude from the surface of the box body to form a first fixed part, a third fixed part and a first fixed part; The beams are installed facing each other, the first fixing part and the third fixing part are fixed to the first fixing beam, the second fixing part, the fourth fixing part and the second fixing beam are facing each other and the second fixing part and the fourth fixing part are fixed to the second fixing beam

In addition, the battery pack further includes a press bar, the first fixing part and the third fixing part are compressed between the press bar and the first fixing beam, the second fixing part and the fourth fixing part are compressed between the press bar and the first fixing beam. 2 fixed beams.

One or more embodiments are illustrated, by way of example, through corresponding accompanying drawing figures. These exemplary descriptions are not intended to limit the examples and like-numbered elements in the figures are represented as similar elements, and unless specifically stated otherwise, the figures of the accompanying drawings do not constitute a proportional limitation.

FIG. 1 is an exploded view of a battery pack according to certain embodiments. FIG. 2 is an exploded view of two battery cell array structures according to the first embodiment. FIG. 3 is an assembly schematic diagram of two battery cell array structures according to the first embodiment. FIG. 4 is a schematic diagram of the structure of the battery module according to the first embodiment. FIG. 5 is an exploded view of the battery module and fixing member according to the first embodiment. FIG. 6 is an assembly schematic diagram of the battery module and the fixing member according to the first embodiment. FIG. 7 is an exploded view of two battery cell array structures according to the second embodiment. FIG. 8 is an assembly schematic diagram of a battery module and a fixing member according to the second embodiment. FIG. 9 is an exploded view of a battery module and fixing members according to the second embodiment. FIG. 10 is an exploded view of a four battery cell array structure according to the third embodiment. FIG. 11 is an assembly schematic diagram of a four battery cell array structure according to the third embodiment. FIG. 12 is a schematic assembly diagram of three battery cell array structures according to the fourth embodiment. FIG. 13 is a schematic diagram of the structure of the battery module according to the fourth embodiment. FIG. 14 is an assembly diagram of a battery cell arrangement structure and a first support according to a specific embodiment; FIG. 15 is an exploded view of a battery cell array structure according to certain embodiments; FIG. 16 is a structural schematic diagram of a battery cell array structure according to a specific embodiment. FIG. 17 is an exploded view of a battery cell according to certain embodiments; FIG. 18 is a cross-sectional view of a winding structure of an electrode assembly in accordance with certain embodiments; FIG. 19 is a cross-sectional view of a laminate structure of an electrode assembly according to certain embodiments.

In order to make the objects, technical ideas and advantages of the embodiments of the present invention clearer, some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are used only to illustrate the application and not to limit the application.

As shown in FIGS. 1 and 2, the present embodiment relates to a battery pack, which includes a storage box and a plurality of battery modules 1 installed in the storage box, wherein the plurality of battery modules 1 are: They may be arranged in the horizontal direction (length direction indicated by arrow x or width direction indicated by arrow y) or may be arranged in the vertical direction (direction indicated by arrow z).

For example, the storage box includes a box cover 2 and a box body 3, the box body 3 is provided with a plurality of first fixed beams 31 and a plurality of second fixed beams 32, and the first fixed beams 31 and the second fixed beams 32 are provided. Two fixed beams 32 protrude from the surface of the box body 3, and the first fixed beam 31 and the second fixed beam 32 are approximately parallel.

In this embodiment, the first fixed beam 31 and the second fixed beam 32 can be convex beams projecting upward from the bottom of the box body 3, or can be separately welded to the bottom of the box body 3 as parts. may be Also, in another embodiment, the first fixed beam 31 and the second fixed beam 32 may be provided on the box cover 2 .

The battery pack further includes a press bar 4 for fixing the battery module 1 to the box body 3 by pressing both ends of the battery module 1 against the first fixing beam 31 and the second fixing beam 32 . At this time, the battery module 1 is fixed by the press bar 4 .

As shown in FIGS. 2 and 3, in this embodiment, the first cover 13 of the battery module 1 includes a first fixing portion 134 and a second fixing portion 135, and the first fixing portion 134 is connected to the first support portion. 131 , the second fixing part 135 is connected to the second support part 132 , the second cover 14 includes a third fixing part 144 and a fourth fixing part 145 , the third fixing part 144 is connected to the third fixing part 144 . It is connected to the support portion 133 , and the fourth fixing portion 145 is connected to the fourth support portion 134 . The first fixing part 134, the third fixing part 144 and the first fixing beam (31) are arranged facing each other, and the first fixing part 134 and the third fixing part 144 are fixed to the first fixing beam (31). The second fixing part 135 , the fourth fixing part 145 and the second fixing beam 32 are arranged to face each other, and the second fixing part 135 and the fourth fixing part 145 are fixed to the second fixing beam 32 .

As shown in FIG. 1 , the first fixing part 134 and the third fixing part 144 are pressed between the press bar 4 and the first fixing beam 31 to fix one end of the battery module 1 to the box body 3 . Let The second fixing part 135 and the fourth fixing part 145 are compressed between the press bar 4 and the second fixing beam 32 to fix the other end of the battery module 1 to the box body 3 . The method of fixing the battery module 1 to the box 3 is not limited to the pressing method using the press bar 4 in this embodiment, but can be fixed by bolting, welding, riveting, or the like.

As shown in FIG. 2, in this embodiment, the battery module 1 includes a battery cell array structure 10, a first cover 13 and a second cover 14, and the battery cell array structure 10 includes the first cover 13 and the second cover 13. It is provided between the cover 14 and the cover 14 . The first cover 13 includes a first support portion 131 and a second support portion 132, and the first support portion 131 and the second support portion 132 have a split structure. The first support portion 131 is fixed to one end of the second cover 14 , and the second support portion 132 is fixed to the other end of the second cover 14 . In the embodiments of FIGS. 2-4 and 7-13 the first cover 13 is placed above the second cover 14 and in the embodiment of FIGS. It is installed under the cover 14 .

The first cover 13 includes a first fixing portion 134 and a second fixing portion 135, the first fixing portion 134 being connected to the first supporting portion 131 and facing away from the second battery cell array structure 102. The second fixing part 135 is connected to the second support part 132 and extends away from the first battery cell array structure 101 .

As a first embodiment, as shown in FIGS. 2 to 6, the second cover 14 includes a main board 1400, a third fixing part 144 and a fourth fixing part 145, and includes a third fixing part 144 and a fourth fixing part 144. The portions 145 are connected to both ends of the main board 1400 and extend away from the main board 1400 . The first fixing portion 134 and the third fixing portion 144 are arranged to face each other and are fixedly connected, and the second fixing portion 135 and the fourth fixing portion 145 are arranged to face each other and are fixedly connected to each other.

As a second embodiment, as shown in FIGS. 7 to 11, the second cover 14 includes a first lower cover 141 and a second lower cover 142, and the first lower cover 141 and the second lower cover 142 are split. Structure. The first support part 131 and the first lower cover 141 are respectively positioned on both sides of the first battery cell array structure 101, and the first support part 131 is positioned above the first lower cover 141, and/or , the second support part 132 and the second lower cover 142 are positioned on both sides of the second battery cell array structure 102 , and the second support part 132 is positioned above the second lower cover 142 .

Optional, as shown in FIG. 7, a first receiving cavity 130 is formed between the first support 131 and the first lower cover 141, and the first battery cell array structure 101 is formed into the first receiving cavity. 130 and/or a second receiving cavity 140 is formed between the second support 132 and the second lower cover 132 , and the second battery cell array structure 102 is disposed in the second receiving cavity 140 . provided in One end of the first receiving cavity 130 facing the second receiving cavity 140 is provided with a first opening, and one end of the second receiving cavity 140 facing the first receiving cavity 130 is provided with a second opening, The first opening and the second opening face each other. The first receiving cavity 130 may pass through the second receiving cavity 140 through the first opening and the second opening.

The battery module 1 includes two or more battery cell arrays 10, one of which is the first battery cell array 101 and the other battery cell array 10 is the second battery cell. Array structure 102 . A first battery cell array structure 101 is provided in the first receiving cavity 130 and a second battery cell array structure 102 is provided in the second receiving cavity 140 .

In the process of assembling the battery module 1 according to the second embodiment, first, the plurality of battery cells 11 of the first battery cell array structure 101 are sequentially put into the first receiving cavity 130, thereby assembling the plurality of battery cells 11 into the first battery cells. 1 supporting part 131 and the first lower cover 141 , and then connected to a plurality of busbars 12 and transferred using the first supporting part 131 and the first lower cover 141 .

Next, the plurality of battery cells 11 of the second battery cell array structure 102 are sequentially inserted into the second receiving cavity 140 so that the plurality of battery cells 11 are arranged between the second support 132 and the second lower cover 142 . , and then connected to a plurality of busbars 12 and transferred using the second support part 132 and the second lower cover 142 . At this time, since the transfer is performed using the first support part 131 and the first lower cover 141, and the second support part 132 and the second lower cover 142 , no additional parts are required, and the energy density of the battery module 1 is increased. improves.

Finally, the first support part 131 , the first lower cover 141 , the second support part 132 and the second lower cover 142 are fixed to each other to complete the assembly of the battery module 1 and the assembled battery module 1 . is shown in Figure 8.

In the third embodiment, the battery module 1 includes two or more battery cell array structures 10 arranged vertically (direction indicated by arrow z). As shown in FIGS. 10 and 11, the battery module 1 includes two first battery cell array structures 101 and two second battery cell array structures 102, the two first battery cell array structures 101 are vertically oriented. (the direction indicated by arrow z), and the two second battery cell array structures 102 are arranged along the vertical direction (direction indicated by arrow z).

The two first battery cell array structures 101 are both installed in the first receiving cavity 130 , and the two second battery cell array structures 102 are both installed in the second receiving cavity 140 . The battery module 1 is not limited to two first battery cell array structures 101 and two second battery cell array structures 102, but may include three or four first battery cell array structures 101, three Or it may include four second battery cell array structures 102 .

In all embodiments, the first support part 131 and the second support part 132 are split structures. The divided structure referred to here is not that the first support part 131 and the second support part 132 of the first cover 13 are manufactured by the same plate, that is, the first support part 131 and the second support part 132 are divided into two parts. It refers to being two independent parts. After the battery module 1 is assembled, the first support part 131 and the second support part 132 may or may not be connected. In this embodiment, the first support part 131 and the second support part 132 function to support the battery cell array structure 10 respectively.

In all embodiments, the first lower cover 141 and the second lower cover 142 are also split structures. The split structure referred to here is not that the first lower cover 141 and the second lower cover 142 are manufactured by the same plate, that is, the first lower cover 141 and the second lower cover 142 are two independent parts. refers to being

Selectably, the length and width of the first lower cover 141 and the first support 131 extending along the horizontal direction (the length direction indicated by arrow x or the width direction indicated by arrow y) are the same as those of the first battery cell array. It is approximately the same as the length and width extending along the horizontal direction of the structure 101 respectively. Similarly, the length and width of the second lower cover 141 and the second support 132 extending in the horizontal direction (the length direction indicated by arrow x or the width direction indicated by arrow y) are the same as those of the second battery cell array structure 102 . are approximately the same as the length and width extending along the horizontal direction of the .

In addition, the length and width of the first lower cover 141 and the first support portion 131 and the length and width of the second lower cover 141 and the second support portion 132 are not limited to the specific structure described above. and the length of the first support part 131 may be longer or shorter than the length of the first battery cell arrangement structure 101, and the width of the first lower cover 141 and the first support part 131 may be equal to the length of the first battery cell arrangement structure. It may be longer or shorter than the width of 101 . The length of the second lower cover 141 and the second support part 132 may be longer or shorter than the length of the second battery cell array structure 102, and the width of the second lower cover 141 and the second support part 132 may be the same as the second battery cell array structure 102. It may be longer or shorter than the width of the two-battery cell array structure 102 .

In all embodiments, the first support 131 and/or the second support 132 are attached to the battery cell array structure 10 by adhesive. For example, the first support part 131 and the second support part 132 are connected by welding, riveting, or adhesive.

The first battery cell array structure 101 is fixed to the first lower cover 141 with an adhesive, and the second battery cell array structure 102 is fixed to the second lower cover 142 with an adhesive. For example, the connection between the first lower cover 141 and the second lower cover 142 is by welding, riveting, adhesive bonding or bolting.

For example, as shown in FIGS. 5 and 6 , the battery module 1 further includes a fixing member 17 , and the first supporting portion 131 connects with the second supporting portion 132 via the fixing member 17 . Furthermore, as shown in FIGS. 8 and 9 , the battery module 1 further includes another fixing member 17 through which the first lower cover 141 connects with the second lower cover 142 .

Optionally, the fixing member 17 is a water cooling plate, and the first supporting part 132 and the second supporting part 132 are respectively fixed with the fixing member 17 by thermally conductive adhesive. At this time, the fixing member 17 is a water cooling plate, the first supporting part 131 and the second supporting part 132 are respectively fixedly connected to the fixing member 17 by thermally conductive adhesive, and the heat generated by the battery cell 11 is The first support part 131 (or the second support part 132 ) is transferred to the water cooling plate by thermally conductive adhesive, and the water cooling plate is used to cool the battery cells 11 . The first lower cover 141 and the second lower cover 142 are each fixed to the fixing member 17 with a thermally conductive adhesive. At this time, the fixing member 17 is a water cooling plate, the first lower cover 141 and the second lower cover 142 are respectively fixedly connected to the fixing member 17 by thermally conductive adhesive, and the heat generated by the battery cell 11 is The first lower cover 141 (or the second lower cover 142 ) is transferred to the water cooling plate by thermally conductive adhesive, and the water cooling plate is used to cool the battery cells 11 . It should be noted that the fixing member 17 is not limited to the embodiment of a water cooling plate, and that other embodiments are possible.

In the process of assembling the battery module 1, first, the plurality of battery cells 11 of the battery cell array structure 10 are sequentially inserted into the first support portion 131 to fix the plurality of battery cells 11 to the first support portion 131, and then , are connected to a plurality of bus bars 12 and transferred using the first support portion 131 . Alternatively, the plurality of battery cells 11 of the battery cell array structure 10 are first sequentially inserted into the second support portion 132 to fix the plurality of battery cells 11 to the second support portion 132 , and then to the plurality of busbars 12 . It is connected and transferred using the second support part 132 .

At this time, since the first cover 13 is used for transfer, no additional components are required, thereby improving the energy density of the battery module 1 .

For example, as shown in FIGS. 2 to 9, in the first embodiment, the battery module 1 includes two battery cell array structures 10, one of which is the first battery cell array structure. 101, the other battery cell array structure 10 is a second battery cell array structure 102, the first battery cell array structure 101 is installed facing the first support 131, and the second battery cell array structure The structure 102 is installed to face the second support 132 .

For example, the length and width extending in the horizontal direction (the length direction indicated by arrow x or the width direction indicated by arrow y) of the first support portion 131 extend along the horizontal direction of the first battery cell array structure 101. The length and width are approximately the same. Similarly, the length and width extending in the horizontal direction (the length direction indicated by arrow x or the width direction indicated by arrow y) of the second support portion 132 are The extending length and width are approximately the same, respectively.

It should be noted that the length and width of the first support part 132 and the length and width of the second support part 132 are not limited to the specific embodiment described above, and the length of the first support part 131 is determined according to the first battery cell arrangement structure. The length of the first support part 131 may be longer or shorter than the length of the first battery cell array structure 101 , and the width of the first support part 131 may be longer or shorter than the width of the first battery cell array structure 101 . Similarly, the length of the second support part 132 may be longer or shorter than the length of the second battery cell array structure 102, and the width of the second support part 132 is greater than the width of the second battery cell array structure 102. It can be long or short.

In the first embodiment, as shown in FIGS. 2 to 4, the second cover 14 includes a main board 1400, and the first supporting portion 131 is a first connecting portion provided vertically (in the direction indicated by arrow z). 1311 , the first connection part 1311 is located on the side of the first battery cell array 101 away from the second battery cell array 102 , and the electrode terminal 115 of the first battery cell array 101 is connected to the second battery cell array 101 . Facing the cell array structure 102 . The second support part 132 includes a second connecting part 1321 provided vertically (in the direction indicated by arrow z), the second connecting part 1321 extending from the first battery cell array structure 101 to the second battery cell array structure 102 . Located on the far side, the electrode terminals 115 of the second battery cell array 102 face the first battery cell array 101 .

In this embodiment, the electrode terminals 115 of the first battery cell array 101 face the second battery cell array 102, while the electrode terminals 115 of the second battery cell array 102 face the first battery cell. Facing array structure 101 . At this time, the welding of the busbars 12 between the plurality of battery cells 11 of the first battery cell array structure 101 and the second battery cell array structure 102 is facilitated, thereby allowing the electrode terminals 115 of the first battery cell array structure 101 to be welded together. and the electrode terminals 115 of the second battery cell array structure 102 can be effectively shortened to improve the energy density of the battery module 1 .

In the second embodiment, the second cover 14 includes a first lower cover 141 and a second lower cover 142, the first support part 131 is connected to the first lower cover 141 through the first connection part 1311, and/or the second support part 132 connects with the second lower cover 142 via the second connection part 1321 .

In all embodiments, the first connection part 133 is located on the side of the first battery cell array 101 away from the second battery cell array 102 , and the second connection part 143 is located on the side of the second battery cell array 102 . is positioned away from the first battery cell array structure 101 of the . The electrode terminals 115 of the first battery cell array structure 101 face the first connecting portion 133 and the electrode terminals 115 of the second battery cell array structure 102 face the second connecting portion 143 .

For example, as shown in FIGS. 12-13, in the fourth embodiment, the battery module 1 includes three battery cell array structures 10, among which the additional battery cell array structure 10 is the third battery cell array structure 103 , and a third battery cell array 103 is provided between the first battery cell array 101 and the second battery cell array 102 . The first cover 13 further includes a third support 133, the third support 133 is provided between the first support 131 and the second support 132, and the third battery cell array structure 103 is the third support. It is installed facing the part 133 .

The battery module 1 is not limited to including only one third battery cell array structure 103, and may include two or more third battery cell array structures 103, that is, the battery module 1 may include four or more third battery cell array structures 103. It has a battery cell array structure 10 . Accordingly, the first cover 13 may have two or more third supports 133 , and each third support 133 faces a corresponding third battery cell array structure 103 . installed.

For example, one end of the third support portion 133 is fixed to the first support portion 131 and the other end of the third support portion 133 is fixed to the second support portion 132 . In another embodiment, both ends of the third support part 133 are respectively fixed to the first support part 131 and the second support part 132 by overlapping structure. Both ends of the third support 133 can be fixed to the first support 131 and the second support 132 by welding, riveting, or adhesive bonding.

As shown in FIG. 14 , in this embodiment, the plurality of battery cells 11 of the battery cell array structure 10 are sequentially put into the first support portion 131 of the first cover 13 so that the plurality of battery cells 11 are first supported. It is fixed to the portion 131 , then connected to a plurality of busbars 12 , and then transferred using the first support portion 131 . At this time, since the first cover 13 is used for transfer, no additional components are required, thereby improving the energy density of the battery module 1 .

As shown in FIGS. 15 and 16, in this embodiment, the battery cell array structure 10 includes a plurality of battery cells 11 and a plurality of bus bars 12 electrically connected to the plurality of battery cells 11. are arranged in the horizontal direction (the length direction indicated by arrow x or the width direction indicated by arrow y). The collection board 15 is located on one side of the battery cell array 10 and vertically installed, and the collection board 15 connects with the electrode terminals 115 of the battery cells 11 in the battery cell array 10 .

In this embodiment, the battery cell array structure 10 further includes two end plates 16, which extend the horizontal direction (the length direction indicated by arrow x and the width direction indicated by arrow y) of the plurality of battery cells 11. direction).

In a particular embodiment, the side surfaces of the battery cells 11 are glued to the adjacent battery cells 11, the ends of the plurality of battery cells 11 are provided with end plates 16, and the battery cells 11 and the end plates are Adhered with glue. Electrical connection is realized between the plurality of battery cells 11 via bus bars 12 .

As shown in FIG. 17 , battery cell 11 includes electrode assembly 111 , battery case 112 , electrode terminal connector 113 , cover plate 114 and electrode terminal 115 . Battery case 112 may have a hexahedral shape or other shapes. The battery case 112 has an internal space for containing the electrode assembly 111 and the electrolyte, and the battery case 112 has an opening. The electrode assembly 111 is housed within the battery case 112 , and a cover plate 114 is used to cover the opening and seal the electrode assembly 111 within the battery case 112 , between the electrode assembly 111 and the electrode terminals 115 . are electrically connected via the electrode terminal connector 113 . In this embodiment, there are two electrode terminal connectors 113 , a positive terminal connector 113 and a negative terminal connector 113 . The battery case 112 can be made of materials such as aluminum, aluminum alloys, or plastics, for example.

The electrode assembly 111 is housed within the battery case 112 and includes a first pole piece 1111 , a second pole piece 1112 , and a diaphragm positioned between the first pole piece 1111 and the second pole piece 1112 . 1113. The first pole piece 1111 can be a positive pole piece or a negative pole piece, and the second pole piece 1112 is opposite to the polarity of the first pole piece 1111, correspondingly the second pole piece 1112 can be a negative pole piece. or a positive electrode piece. Among them, the diaphragm 1113 is an insulator located between the first pole piece 1111 and the second pole piece 1112 . Electrode assembly 111 may be of a wound construction (shown in FIG. 18) or a laminated construction (shown in FIG. 19).

For example, the first pole piece 1111 is described as a positive electrode piece, and the second pole piece 1112 is described as a negative electrode piece. Similarly, in other embodiments, the first pole piece 1111 can be the negative pole piece and the second pole piece 1112 can be the positive pole piece. In addition, the positive electrode active material is coated on the coating region of the positive electrode piece, and the negative electrode active material is coated on the coating region of the negative electrode piece. The uncoated area extending from the coating area is the lug, and the electrode assembly 111 includes two lugs, a positive lug and a negative lug, the positive lug extending from the coating area of the positive piece and the negative lug being the negative piece. extends from the coating area of the An electrical connection is made between the positive lug and the positive electrode terminal 115 via a positive terminal connector 113 , and an electrical connection is made between the negative lug and the negative electrode terminal 115 via a negative terminal connector 113 . be done.

The battery case 112 has a substantially hexahedral structure, the battery case 112 includes two first surfaces 1121 and two second surfaces 1122 , the area of the first surfaces 1121 being larger than the area of the second surfaces 1122 . In the battery module 1, the two second surfaces 1122 of each battery cell 11 face each other along the horizontal direction (e.g., the lengthwise direction indicated by arrow x), and the two first surfaces 1121 of each battery cell 11 Facing each other along the vertical direction (direction indicated by arrow z).

As shown in FIGS. 18 and 19, when the electrode assembly 111 is of a wound structure, the electrode assembly 111 has a flat shape, and the outer surface of the electrode assembly 111 includes two flat surfaces 1114, and two flat surfaces 1114. Both planar surfaces 1114 face each other along the vertical direction (direction indicated by arrow z), ie, planar surface 1114 and first surface 1121 face each other. Electrode assembly 111 is generally a hexahedral structure, with flat surface 1114 being the largest outer surface that is generally parallel to the winding axis. Planar surface 1114 may be a relatively flat surface and need not be purely planar.

As shown in FIG. 18, when the electrode assembly 111 is of a laminated structure, the first pole piece 1111, the diaphragm 1113, and the second pole piece 1112 are vertically stacked (indicated by arrow z), i.e., the second The surface of the one pole piece 1111 and the first surface 1121 face each other.

The electrode assembly 111 inevitably expands along the thickness direction of the first pole piece 1111 during charging and discharging processes (in the wound structure electrode assembly 111, the expansion along the direction perpendicular to the flat surface 1114). force is maximum, and in a laminated structure electrode assembly 111, the expansion force along the stacking direction of the first pole piece 1111 and the second pole piece 1112 is maximum).

In this embodiment, the electrode assembly 111 may be a wound structure or a laminated structure. If the electrode assembly 111 is of a wound construction, the flat surface 1114 faces vertically (indicated by arrow z). If the electrode assembly 111 is a laminated structure, the first pole piece 1111 and the second pole piece 1112 are stacked vertically (indicated by arrow z). It can be seen that the direction of the maximum expansion force exerted by the electrode assembly 111 on the battery case 112 is in the vertical direction, regardless of whether the electrode assembly 111 adopts a wound structure or a laminated structure.

In the prior art, in the battery cell 11 of the battery module 1, the direction of maximum expansion force applied by the electrode assembly 111 to the battery case 112 is all horizontal, and the horizontal size of the battery module 1 is the vertical size. (for example, limited by the height of the vehicle chassis, more battery cells 11 need to be stacked horizontally, and the expansion force accumulation is large), the existing battery module 1 can be mounted horizontally In order to resist the expansion force, it is necessary to install very thick end plates on both sides of the battery module 1 in the horizontal direction. be lowered. In contrast, in the present embodiment, the direction of maximum expansion force applied by the electrode assembly 111 to the battery case 112 is vertical, and the number of vertically stacked battery cells 11 is small, so the prior art , the maximum expansion force of the battery module 1 can be significantly reduced.

It should be noted that since the battery cells 11 generate gas within the battery case 112 during the charging and discharging processes, the generated gas exerts a force on the battery case 112, causing the outward expansion of the battery case 112. make worse. The area of the first surface 1121 of the present invention is larger than the area of the second surface 1122, and the two first surfaces 1121 of the battery cell 11 face each other along the vertical direction, so that the generated gas can flow into the battery case 112. The direction of the maximum force applied to it is also vertical. Compared with the prior art, the maximum expansion force of the battery module 1 is further reduced.

One or more embodiments are illustrated, by way of example, through corresponding accompanying drawing figures. These exemplary descriptions are not intended to limit the examples and like-numbered elements in the figures are represented as similar elements, and unless specifically stated otherwise, the figures of the accompanying drawings do not constitute a proportional limitation.

Claims (12)

a battery cell array structure (10) comprising a plurality of battery cells (11);
a first cover (13);
a second cover (14);
The first cover (13) is connected to the second cover (14), and the battery cell array structure (10) is provided between the first cover (13) and the second cover (14). ,
Here, the first cover (13) includes a first support (131) and a second support (132), and the first support (131) and the second support (132) are divided. is a structure,
A battery module (1) includes two or more battery cell array structures (10), one of which the battery cell array structure (10) is a first battery cell array structure (101), the other one is a battery cell array structure (101). one said battery cell array structure (10) is a second battery cell array structure (102);
The first battery cell arrangement structure (101) is installed to face the first support part (131), and the second battery cell arrangement structure (102) is installed to face the second support part (132). is installed in
The first support part (131) and the second support part (132) are flat structure covering the battery cell array structure (10),
The first cover (13) further comprises a first fixing part (134) and a second fixing part (135), the first fixing part (134) being connected to the first supporting part (131), and extending away from the second battery cell arrangement structure (102), the second fixing part (135) is connected to the second support part (132), and the first battery cell arrangement structure ( 101) extending away from the
The second cover (14) includes a main board (1400), a third fixing part (144) and a fourth fixing part (145), wherein the third fixing part (144) and the fourth fixing part (145) ) are respectively connected to both ends of the main board (1400),
The first fixing part (134) and the third fixing part (144) are installed to face each other and fixedly connected, and the second fixing part (135) and the fourth fixing part (145) face each other. installed and fixedly connected to the
The first battery cell array structure (101) is fixed to the first support part (131) by an adhesive, and the second battery cell array structure (102) is fixed to the second support part (132) by an adhesive. death,
The first battery cell arrangement structure (101) fixed to the first support part (131) and the second battery cell arrangement structure (102) fixed to the second support part (132) are connected to the second battery cell arrangement structure (101). housed in the cover (14);
A method of manufacturing a battery module, characterized by: The battery cell (11) comprises a battery case (112), a cover plate (114) and an electrode terminal (115), the cover plate (114) is connected to the battery case (112) and the electrode terminal ( 115) is provided on the cover plate (114) and configured to be electrically connected to the bus bar (12), the electrode terminals (115) of the first battery cell array structure (101) are connected to the second Facing or opposite the battery cell array structure (102);
and/or wherein said electrode terminals (115) of said second battery cell array (102) face or face away from said first battery cell array (101). 2. The method for manufacturing the battery module according to 1. The battery module (1) further includes a first connecting portion (1311) vertically provided, the first connecting portion (1311) being connected to the second battery cell of the first battery cell array structure (101). The first connecting part (1311), which is located on the side away from the array structure (102), connects the first supporting part (131) and the first fixing part (134). the electrode terminals (115) of the battery cell array (101) face the second battery cell array (102); and/or
The battery module (1) further includes a second connecting portion (1321) vertically provided, wherein the second connecting portion (1321) is connected to the first battery cell of the second battery cell array structure (102). The second connection part (1321), which is located on the side away from the array structure (101), connects the second support part (132) and the second fixing part (135). The method of claim 2, wherein the electrode terminals (115) of the battery cell array (102) face the first battery cell array (101). The battery module (1) comprises three or more battery cell arrays (10), another of the battery cell arrays (10) is a third battery cell array (103), the third a battery cell array (103) is provided between the first battery cell array (101) and the second battery cell array (102);
The first cover (13) further includes a third support (133), the third battery cell array structure (103) is installed to face the third support (133),
The method of claim 1, wherein the third battery cell array structure (103) fixed to the third support part (133) is accommodated in the second cover (14). One end of the third support part (133) is fixed to the first support part (131), and the other end of the third support part (133) is fixed to the second support part (132). The manufacturing method of the battery module according to claim 4. Said battery cell (11) includes an electrode assembly (111), said electrode assembly (111) is housed within said battery case (112), said electrode assembly (111) comprises a first pole piece (1111) , the second pole piece (1112)
, and a diaphragm (1113) provided between said first pole piece (1111) and said second pole piece (1112);
The electrode assembly (111) is of winding structure and flat shape, the outer surface of the electrode assembly (111) comprises two flat surfaces (1114), the two flat surfaces (1114) are perpendicular facing directions, or
3. The electrode assembly (111) is a laminated structure, wherein the first pole piece (1111), the diaphragm (1113) and the second pole piece (1112) are vertically stacked. 4. The method for manufacturing a battery module according to any one of 3. The first support part (131) and the second support part (132) according to any one of claims 1 to 5, characterized in that they are connected by welding, riveting or adhesive bonding. of the battery module manufacturing method. The battery module (1) further includes a fixing member (17), and the first supporting part (131) is connected to the second supporting part (132) through the fixing member (17). The method for manufacturing a battery module according to any one of claims 1 to 5. The fixing member (17) is a water cooling plate, and the first supporting part (131) and the second supporting part (132) are each fixed to the fixing member (17) by thermally conductive adhesive. The manufacturing method of the battery module according to claim 8. including a storage box,
A method for manufacturing a battery pack, characterized in that the battery module (1) according to any one of the plurality of claims 1 to 9 is installed in the storage box. The first cover (13) includes a first fixing part (134) and a second fixing part (135), the first fixing part (134) is connected to the first support part (131), and the The second fixing part (135) is connected to the second support part (132),
The second cover (14) includes a main board (1400), a third fixing part (144) and a fourth fixing part (145), wherein the third fixing part (144) and the fourth fixing part (145) ) are respectively connected to both ends of the main board (1400),
The storage box includes a box cover (2) and a box body (3), the box body (3) is provided with a first fixed beam (31) and a second fixed beam (32), and the first fixed beam (31) and a second fixed beam (32) are provided. A beam (31) and said second fixed beam (32) protrude from the surface of said box body (3) to form said first fixed part (134), said third fixed part (144) and said first fixed beam (31) are installed facing each other, the first fixing part (134) and the third fixing part (144) are fixed to the first fixing beam (31), and the second fixing part (135) ), the fourth fixing part (145), and the second fixing beam (32) are positioned to face each other, and the second fixing part (135) and the fourth fixing part (145) are located opposite to the second fixing part (145). 11. The method of manufacturing a battery pack according to claim 10, wherein the battery pack is fixed to a fixed beam (32). The battery pack further comprises a press bar (4), wherein the first fixing part (134) and the third fixing part (144) are between the pressing bar (4) and the first fixing beam (31). Claim characterized in that the second fixing part (135) and the fourth fixing part (145) are squeezed between the press bar (4) and the second fixing beam (32). Item 12. A method for manufacturing a battery pack according to Item 11.