WO2020177738A1 - Battery module and battery pack - Google Patents

Abstract

The present application relates to a battery module (1), comprising battery cell arrangement structures (10), a first cover (13), and a second cover (14), the first cover (13) being connected to the second cover (14), and the battery cell arrangement structure (10) being provided between the first cover (13) and the second cover (13). The first cover (13) comprises a first supporting part (131) and a second supporting part (132), the first supporting part (131) and the second supporting part (132) being of a separated structure. The battery module (1) comprises two or more of the battery cell arrangement structures (10), a first battery cell arrangement structure (101) and the first supporting part (131) being correspondingly arranged, and a second battery cell arrangement structure (102) and the second supporting part (131) being correspondingly arranged.

Description

Battery module and battery pack

cross reference

This application refers to the Chinese patent application No. 201910173001.9 filed on March 7, 2019 under the title "A battery module and battery pack", and the Chinese patent application filed on March 20, 2019 under the title "A battery module and battery" Chinese Patent Application No. 201910212474.5 of "Bao", which is fully incorporated into this application by reference.

Technical field

This application relates to the field of battery technology, and in particular to a battery module and a battery pack.

Background technique

Secondary batteries have the advantages of high energy density, long service life, energy saving and environmental protection, and are widely used in different fields such as new energy vehicles and energy storage power stations.

The battery module includes a battery cell arrangement structure, a bus bar, an upper cover and a lower cover. The battery cell arrangement structure includes a plurality of battery cells and a plurality of bus bars electrically connected to the plurality of battery cells. The battery cell arrangement structure is accommodated in Inside the containing cavity enclosed by the upper cover and the lower cover. When assembling the battery module, if multiple battery cells are fixed and connected to multiple bus bars to form a battery cell arrangement structure and then the battery cell arrangement structure is transferred to the accommodating cavity, the battery cell arrangement structure is required There are additional parts for transportation, but this will reduce the energy density of the battery module.

Therefore, when assembling the battery module, a plurality of battery cells are usually put into the accommodating cavity one by one, and the plurality of battery cells are fixed, and then a plurality of bus bars are connected. However, when the battery module has a plurality of battery cell arrangement structures, and the distance between the plurality of battery cell arrangement structures is small, the connection of the bus bar becomes extremely difficult (at this time, there is no operating space for the fixture connecting the bus bar ).

Summary of the invention

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

In order to achieve the above object, the inventor provides a battery module, including: a battery cell arrangement structure, the battery cell arrangement structure includes a plurality of battery cells and a plurality of bus bars electrically connecting the plurality of battery cells, a first cover And a second cover, the first cover is connected to the second cover, the battery cell arrangement structure is provided between the first cover and the second cover; wherein the first cover includes a first supporting portion And the second supporting part, the first supporting part and the second supporting part are separated structures; the battery module includes more than two battery cell arrangement structures, one of which is the first battery cell arrangement The other battery cell arrangement structure is the second battery cell arrangement structure; the first battery cell arrangement structure is arranged opposite to the first supporting part, and the second battery cell arrangement structure is arranged opposite to the second supporting part.

In addition, the second cover body includes a first lower cover portion and a second lower cover portion. The first lower cover portion and the second lower cover portion are of a split structure, and the first supporting portion and the first lower cover portion are located in the first On both sides of the battery cell arrangement structure, and the first supporting portion is located above the first lower cover portion; and/or, the second supporting portion and the second lower cover portion are respectively located on two sides of the second battery cell arrangement structure Side, and the second supporting portion is located above the second lower cover portion.

In addition, a first accommodating cavity is formed between the first supporting part and the first lower cover, and the first battery cell arrangement structure is arranged in the first accommodating cavity; and/or, the second supporting part and the second lower cover A second accommodating cavity is formed between the parts, and the second battery cell arrangement structure is arranged in the second accommodating cavity.

In addition, the first supporting portion and the second supporting portion are connected by welding, riveting, bonding or bolting; and/or, the first lower cover portion and the second lower cover portion are connected by welding, riveting, Connect by bonding or bolting.

In addition, the battery module further includes a fixing member, and the first lower cover portion is connected to the second lower cover portion through the fixing member.

In addition, the fixing member is a water-cooled plate, and the first lower cover portion and the second lower cover portion are respectively fixed to the fixing member by thermally conductive glue.

In addition, the first battery cell arrangement structure is fixed to the first lower cover part by glue, and the second battery cell arrangement structure is fixed to the second lower cover part by glue.

In addition, an end of the first accommodating cavity facing the second accommodating cavity is provided with a first opening, and an end of the second accommodating cavity facing the first accommodating cavity is provided with a second opening, and the first opening and the second opening face each other.

In addition, the battery module also includes a first connecting portion vertically arranged, the first connecting portion is located on the side of the first battery cell arrangement structure away from the second battery cell arrangement structure, and the first supporting portion (131) passes through the first battery cell arrangement structure. The connecting portion is connected to the first lower cover portion; and/or, the battery module further includes a first connecting portion that is vertically arranged, and the first connecting portion is located at one of the second battery cell arrangement structure away from the first battery cell arrangement structure On the side, the second supporting portion is connected with the second lower cover portion through the first connecting portion.

In addition, the battery cell includes a battery case, a cover plate and electrode terminals, the cover plate is connected to the battery case, and the electrode terminals are arranged on the cover plate and electrically connected to the bus bar; the electrode terminals of the first battery cell arrangement structure face or Back to the second battery cell arrangement structure; and/or, the electrode terminal of the second battery cell arrangement structure faces or faces the first battery cell arrangement structure.

In addition, the battery module further includes a first connecting portion arranged vertically, the first connecting portion is located on the side of the first battery cell array structure away from the second battery cell array structure, and the electrode terminals of the first battery cell array structure Towards the second battery cell arrangement structure; and/or, the battery module further includes a first connection portion vertically arranged, and the first connection portion is located on a side of the second battery cell arrangement structure away from the first battery cell arrangement structure , The electrode terminal of the second battery cell arrangement structure faces the first battery cell arrangement structure.

In addition, the battery module includes more than three battery cell arrangement structures, and another battery cell arrangement structure is the third battery cell arrangement structure, and the third battery cell arrangement structure is arranged between the first battery cell arrangement structure and the second battery cell arrangement structure. Between the two battery cell arrangement structures; the first cover body also includes a third supporting portion, and the third battery cell arrangement structure is opposite to the third supporting portion.

In addition, one end of the third supporting part is fixed to the first supporting part, and the other end of the third supporting part is fixed to the second supporting part.

In addition, the first cover further includes a first fixing portion and a second fixing portion. The first fixing portion is connected to the first supporting portion and extends away from the first supporting portion, and the second fixing portion is connected to the second supporting portion. The supporting portion extends in a direction away from the second supporting portion; the second cover includes a main board, a third fixing portion, and a fourth fixing portion. The third fixing portion and the fourth fixing portion are respectively connected to both ends of the main board; The fixing part and the third fixing part are arranged oppositely and fixedly connected, and the second fixing part and the fourth fixing part are arranged oppositely and fixedly connected.

In addition, the battery cell includes an electrode assembly and a battery case. The electrode assembly is contained in the battery case. The electrode assembly includes a first pole piece, a second pole piece, and a diaphragm arranged between the first pole piece and the second pole piece; The electrode assembly has a rolled structure and is flat. The outer surface of the electrode assembly includes two flat surfaces, which face each other in a vertical direction; or, the electrode assembly has a laminated structure, and the first pole piece, The diaphragm and the second pole piece are stacked in the vertical direction.

In addition, the battery module also includes a collection board, the collection board is arranged vertically, and the collection board is connected with the battery cell.

In addition, the first battery cell arrangement structure is fixed to the first supporting part by glue, and the second battery cell arrangement structure is fixed to the second supporting part by glue.

In addition, the first supporting portion and the second supporting portion are connected by welding, riveting or bonding.

In addition, the battery module further includes a fixing member, and the first supporting portion is connected to the second supporting portion through the fixing member.

In addition, the fixing member is a water-cooled plate, and the first supporting portion and the second supporting portion are respectively fixed to the fixing member by thermally conductive glue.

Different from the prior art, the first cover body includes a first supporting portion and a second supporting portion, and the first supporting portion and the second supporting portion are of a split structure. Therefore, a plurality of battery cells can be put into the first supporting part in sequence first to fix the plurality of battery cells on the first supporting part, and then a plurality of bus bars can be connected, and then the first supporting part can be used for transport. Similarly, the same effect can be achieved by placing multiple battery cells in the second supporting part in sequence. At this time, since the first cover is used for transportation, no additional components are needed, thereby increasing the energy density of the battery module.

In order to achieve the above-mentioned object, the inventor also provides a battery pack, including: a storage box, and a plurality of battery modules provided in the storage box, according to any one of the above-mentioned inventors.

In addition, the first cover includes a first fixing portion and a second fixing portion, the first fixing portion is connected to the first supporting portion, and the second fixing portion is connected to the second supporting portion; the second cover includes a main board, a third The fixing part and the fourth fixing part, the third fixing part and the fourth fixing part are respectively connected to both ends of the main board; the containing box includes a box cover and a box body, and the box body is provided with a first fixed beam and a second fixed beam. The fixed beam and the second fixed beam protrude from the surface of the box body, the first fixed part, the third fixed part and the first fixed beam are arranged oppositely, and the first fixed part and the third fixed part are fixed on the first fixed beam , The second fixing part, the fourth fixing part and the second fixing beam are arranged oppositely, and the second fixing part and the fourth fixing part are fixed on the second fixing beam.

In addition, the battery pack further includes a bead, the first fixing part and the third fixing part are pressed between the bead and the first fixing beam, and the second fixing part and the fourth fixing part are pressed between the bead and the second fixing beam.

Description of the drawings

One or more embodiments are exemplified by the pictures in the corresponding drawings. These exemplified descriptions do not constitute a limitation on the embodiments. Elements with the same reference numbers in the drawings are represented as similar elements. Unless otherwise stated, the figures in the attached drawings do not constitute a limitation of scale.

Figure 1 is an exploded view of a battery pack in a specific embodiment;

Figure 2 is an exploded view of the arrangement structure of two battery cells in the first embodiment;

FIG. 3 is an assembly diagram of the arrangement structure of two battery cells in the first embodiment;

4 is a schematic diagram of the structure of the battery module according to the first embodiment;

Figure 5 is an exploded view of the battery module and the fixing member of the first embodiment;

6 is a schematic diagram of the assembly of the battery module and the fixing member in the first embodiment;

FIG. 7 is an exploded view of the arrangement structure of two battery cells in the second embodiment;

8 is a schematic diagram of the assembly of the battery module and the fixing member in the second embodiment;

Figure 9 is an exploded view of the battery module and the fixing member of the second embodiment;

10 is an exploded view of the arrangement structure of four battery cells in the third embodiment;

11 is a schematic diagram of the assembly of the arrangement structure of four battery cells in the third embodiment;

12 is a schematic diagram of the assembly of the arrangement structure of three battery cells in the fourth embodiment;

FIG. 13 is a schematic diagram of the structure of a battery module according to a fourth embodiment;

14 is an assembly diagram of the battery cell arrangement structure and the first supporting part of the specific embodiment;

Figure 15 is an exploded view of the battery cell arrangement structure of a specific embodiment;

16 is a schematic structural diagram of the arrangement structure of battery cells in a specific embodiment;

Figure 17 is an exploded view of a battery cell in a specific embodiment;

18 is a cross-sectional view of the electrode assembly of the specific embodiment in a wound structure;

Fig. 19 is a cross-sectional view of a laminated structure of the electrode assembly of the specific embodiment.

Specific embodiment

In order to make the objectives, technical solutions, and advantages of the present application clearer, some embodiments of the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the application, and are not used to limit the application.

1 and FIG. 2, this embodiment relates to a battery pack, the battery pack includes a containing box and a plurality of battery modules 1 arranged in the containing box, the plurality of battery modules 1 can be along the horizontal direction (arrow x indicates The length direction or the width direction indicated by the arrow y) can also be arranged in the vertical direction (the direction indicated by the arrow z).

For example, the containing 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 protrude from the box. On the surface of the body 3, the first fixed beam 31 and the second fixed beam 32 are substantially parallel.

In this embodiment, the first fixed beam 31 and the second fixed beam 32 may be convex beams protruding upward from the bottom of the box 3 or separately welded to the bottom of the box 3 as parts. In addition, in other embodiments, 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 bead 4 which presses the two ends of the battery module 1 on the first fixing beam 31 and the second fixing beam 32 to fix the battery module 1 on the box body 3. At this time, the battery module 1 is fixed by the bead 4.

As shown in Figures 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. The first fixing portion 134 is connected to the first supporting portion 131, The two fixing portions 135 are connected to the second supporting portion 132; the second cover 14 includes a third fixing portion 144 and a fourth fixing portion 145. The third fixing portion 144 is connected to the third supporting portion 133 and the fourth fixing portion 145 Connected to the fourth supporting portion 134. The first fixing portion 134, the third fixing portion 144 and the first fixing beam (31) are arranged oppositely, the first fixing portion 134, the third fixing portion 144 are fixed on the first fixing beam (31), and the second fixing portion 135, the fourth fixing portion 145 and the second fixing beam 32 are arranged oppositely, and the second fixing portion 135 and the fourth fixing portion 145 are fixed on the second fixing beam 32.

As shown in FIG. 1, the first fixing portion 134 and the third fixing portion 144 are compressed between the pressing bar 4 and the first fixing beam 31 to fix one end of the battery module 1 on the box 3. The second fixing portion 135 and the fourth fixing portion 145 are compressed between the bead 4 and the second fixing beam 32 to fix the other end of the battery module 1 on the box body 3. It should be noted that the method of fixing the battery module 1 to the box 3 is not limited to the method of pressing the bead 4 in this embodiment, and may also be fixed by bolts, welding, riveting, and 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. The battery cell array structure 10 is provided on the first cover 13 and the second cover 13 Between the cover 14. The first cover 13 includes a first supporting portion 131 and a second supporting portion 132, and the first supporting portion 131 and the second supporting portion 132 have a split structure. The first supporting portion 131 is fixed to one end of the second cover 14, and the second supporting portion 132 is fixed to the other end of the second cover 14. In the embodiments of FIGS. 2 to 4 and FIGS. 7 to 13, the first cover 13 is disposed above the second cover 14. In the embodiments of FIGS. 5 to 6, the first cover 13 is disposed on Below the second cover 14.

The first cover 13 includes a first fixing portion 134 and a second fixing portion 135. The first fixing portion 134 is connected to the first supporting portion 131 and extends in a direction away from the second battery cell arrangement structure 102. The second fixing portion 135 is connected to the second supporting portion 132 and extends in a direction away from the first battery cell arrangement 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 portion 144, and a fourth fixing portion 145. The third fixing portion 144 and the fourth fixing portion 145 are respectively connected to Both ends of the main board 1400 extend in a direction away from the main board 1400. The first fixing portion 134 and the third fixing portion 144 are oppositely arranged and fixedly connected, and the second fixing portion 135 and the fourth fixing portion 145 are oppositely arranged and fixedly connected.

As a second embodiment, as shown in FIGS. 7 to 11, the second cover 14 includes a first lower cover portion 141 and a second lower cover portion 142. The first lower cover portion 141 and the second lower cover portion 142 are divided Body structure, the first supporting portion 131 and the first lower cover portion 141 are respectively located on both sides of the first battery cell arrangement structure 101, and the first supporting portion 131 is located above the first lower cover portion 141; and/or The second supporting portion 132 and the second lower cover portion 142 are respectively located on two sides of the second battery cell arrangement structure 102, and the second supporting portion 132 is located above the second lower cover portion 142.

Optionally, as shown in FIG. 7, a first receiving cavity 130 is formed between the first supporting portion 131 and the first lower cover portion 141, and the first battery cell arrangement structure 101 is disposed in the first receiving cavity 130; and /Or, a second receiving cavity 140 is formed between the second supporting portion 132 and the second lower cover portion 132, and the second battery cell arrangement structure 102 is disposed in the second receiving cavity 140. An end of the first accommodation cavity 130 facing the second accommodation cavity 140 is provided with a first opening, and an end of the second accommodation cavity 140 facing the first accommodation cavity 130 is provided with a second opening, and the first opening and the second opening face each other. The first receiving cavity 130 may communicate with the second receiving cavity 140 through the first opening and the second opening.

The battery module 1 includes two or more battery cell arrangement structures 10, one of which is the first battery cell arrangement structure 101, and the other battery cell arrangement structure 10 is the second battery cell arrangement structure 102 . The first battery cell arrangement structure 101 is arranged in the first accommodating cavity 130, and the second battery cell arrangement structure 102 is arranged in the second accommodating cavity 140.

In the assembling process of the battery module 1 of the second embodiment, the plurality of battery cells 11 of the first battery cell arrangement structure 101 are sequentially placed in the first accommodating cavity 130, so that the plurality of battery cells 11 It is fixed between the first supporting portion 131 and the first lower cover portion 141, and then a plurality of bus bars 12 are connected, and then the first supporting portion 131 and the first lower cover portion 141 are used for transportation.

Then put the plurality of battery cells 11 of the second battery cell arrangement structure 102 into the second accommodating cavity 140 in order to fix the plurality of battery cells 11 on the second supporting portion 132 and the second upper cover plate Between 142, a plurality of bus bars 12 are subsequently connected, and then the second supporting portion 132 and the second upper cover 142 are used for transport. At this time, since the first supporting portion 131 and the first lower cover portion 141, as well as the second supporting portion 132 and the second upper cover plate 142 are used for transportation, no additional components are required, thereby improving the battery module 1 Energy Density.

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

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

The two first battery cell arrangement structures 101 are both arranged in the first accommodating cavity 130, and the two second battery cell arrangement structures 102 are arranged in the second accommodating cavity 140. The battery module 1 is not limited to the case of two first battery cell arrangement structures 101 and two second battery cell arrangement structures 102, and may also include three or four first battery cell arrangement structures 101. The case of three or four second battery cell arrangement structures 102 may also be included.

In all the embodiments, the first supporting portion 131 and the second supporting portion 132 have a split structure. The split structure mentioned here means that the first supporting portion 131 and the second supporting portion 132 of the first cover 13 are not processed from the same plate, that is, the first supporting portion 131 and the second supporting portion 132 The part 132 is two separate parts. After the battery module 1 is assembled, the first supporting part 131 and the second supporting part 132 may be connected or not. In this embodiment, the first supporting portion 131 and the second supporting portion 132 respectively function to support the battery cell arrangement structure 10.

In all the embodiments, the first lower cover portion 141 and the second lower cover portion 142 are also split structures. The split structure mentioned here means that the first lower cover portion 141 and the second lower cover portion 142 are not the same The first lower cover 141 and the second lower cover 142 are two separate parts.

Optionally, the length and width of the first lower cover portion 141 and the first supporting portion 131 in the horizontal direction (the length direction indicated by the arrow x or the width direction indicated by the arrow y) are respectively aligned with the first battery cell The length and width of the structure 101 extending in the horizontal direction are approximately the same. Similarly, the length and width of the second lower cover portion 141 and the second supporting portion 132 extending in the horizontal direction (the length direction indicated by the arrow x or the width direction indicated by the arrow y) is the same as the second battery cell arrangement structure 102 The length and width extending in the horizontal direction are approximately equal.

It should be noted that the length and width of the first lower cover portion 141 and the first supporting portion 131, and the length and width of the second lower cover portion 141 and the second supporting portion 132 are not limited to the specific structure described above. In an embodiment, the length of the first lower cover portion 141 and the first supporting portion 131 may be greater than or less than the length of the first battery cell arrangement structure 101, and the width of the first lower cover portion 141 and the first supporting portion 131 It is larger or smaller than the width of the first battery cell arrangement structure 101. The length of the second lower cover portion 141 and the second supporting portion 132 is larger or smaller than the length of the second battery cell arrangement structure 102, and the width of the second lower cover portion 141 and the second supporting portion 132 is larger or smaller than that of the second battery The width of the single arrangement structure 102.

In all the embodiments, the first supporting portion 131 and/or the second supporting portion 132 are attached to the battery cell arrangement structure 10 by glue. For example, the first supporting portion 131 and the second supporting portion 132 are connected by welding, riveting or bonding.

The first battery cell arrangement structure 101 is fixed to the first lower cover part 141 by glue, and the second battery cell arrangement structure 102 is fixed to the second lower cover part 142 by glue. For example, the first lower cover portion 141 and the second lower cover portion 142 are connected by welding, riveting, bonding or bolting.

For example, as shown in FIGS. 5 to 6, the battery module 1 further includes a fixing member 17, and the first supporting portion 131 is connected to the second supporting portion 132 through the fixing member 17. Further, as shown in FIGS. 8 and 9, the battery module 1 further includes another fixing member 17, and the first lower cover portion 141 is connected to the second lower cover portion 142 through the fixing member 17.

Optionally, the fixing member 17 is a water-cooled plate, and the first supporting portion 131 and the second supporting portion 132 are respectively fixed to the fixing member 17 by thermally conductive glue. At this time, the fixing member 17 is a water-cooled plate, and the first supporting portion 131 and the second supporting portion 132 are respectively fixedly connected to the fixing member 17 by thermally conductive glue, and the heat generated by the battery cell 11 is passed through the first supporting portion 131 ( Or the second supporting portion 132) and the thermal conductive glue are transferred to the water cooling plate, and the battery cell 11 is cooled by the water cooling plate. The first lower cover portion 141 and the second lower cover portion 142 are respectively fixed to the fixing member 17 by thermally conductive glue. At this time, the fixing member 17 is a water-cooled plate, and the first lower cover portion 141 and the second lower cover portion 142 are respectively fixedly connected to the fixing member 17 by thermally conductive glue, and the heat generated by the battery cell 11 passes through the first lower cover portion 141 ( Or the second lower cover part 142) the thermal conductive glue is transferred to the water cooling plate, and the battery cell 11 is cooled by the water cooling plate. It should be noted that the fixing member 17 is not limited to the embodiment of the water-cooling plate, and other embodiments are also possible.

During the assembling process of the battery module 1, the multiple battery cells 11 of the battery cell arrangement structure 10 are sequentially placed into the first supporting portion 131 to fix the multiple battery cells 11 on the first supporting portion 131 , And then connect a plurality of bus bars 12, and then use the first supporting part 131 for transport. Or, first put the plurality of battery cells 11 of the battery cell arrangement structure 10 into the second supporting portion 132 in order to fix the plurality of battery cells 11 on the second supporting portion 132, and then connect a plurality of buss Row 12, and then use the second supporting part 132 for transfer.

At this time, since the first cover 13 is used for transportation, no additional components are needed, thereby increasing 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 arrangement structures 10, one of which is the first battery cell arrangement structure 101, Another battery cell arrangement structure 10 is a second battery cell arrangement structure 102; the first battery cell arrangement structure 101 is arranged opposite to the first supporting portion 131, and the second battery cell arrangement structure 102 is opposite to the second supporting portion 132 relative settings.

For example, the length and width of the first supporting portion 131 in the horizontal direction (the length direction indicated by the arrow x or the width direction indicated by the arrow y) are respectively the same as the length and the length of the first battery cell array structure 101 extending in the horizontal direction. The width is approximately equal. Similarly, the length and width of the second supporting portion 132 extending in the horizontal direction (the length direction indicated by the arrow x or the width direction indicated by the arrow y) are respectively the same as the length of the second battery cell array structure 102 extending in the horizontal direction. It is roughly equal to the width.

It should be noted that the length and width of the first supporting portion 131 and the length and width of the second supporting portion 132 are not limited to the specific embodiment in the above structure, and the length of the first supporting portion 131 can also be used. Larger or smaller than the length of the first battery cell arrangement structure 101, and the width of the first supporting portion 131 is larger or smaller than the width of the first battery cell arrangement structure 101. Similarly, the length of the second supporting portion 132 is greater than or less than the length of the second battery cell arrangement structure 102, and the width of the second supporting portion 132 is greater than or less than the width of the second battery cell arrangement structure 102.

For the first embodiment, for the embodiment in which the second cover 14 includes the main board 1400, as shown in FIGS. 2 to 4, the first supporting portion 131 includes a vertical arrangement (as indicated by the arrow z) The first connection portion 1311 is located on the side of the first battery cell arrangement structure 101 away from the second battery cell arrangement structure 102, and the electrode terminal 115 of the first battery cell arrangement structure 101 faces the second The battery cell arrangement structure 102. The second supporting portion 132 includes a second connecting portion 1321 arranged vertically (as indicated by the arrow z), and the second connecting portion 1321 is located on the second battery cell arrangement structure 102 away from the first battery cell arrangement structure 101 On one side, the electrode terminal 115 of the second battery cell arrangement structure 102 faces the first battery cell arrangement structure 101.

In this embodiment, the electrode terminal 115 of the first battery cell arrangement structure 101 faces the second battery cell arrangement structure 102, and the electrode terminal 115 of the second battery cell arrangement structure 102 faces the first battery cell arrangement structure 101. At this time, it is possible to facilitate the welding of the bus bars 12 between the plurality of battery cells 11 of the first battery cell arrangement structure 101 and the second battery cell arrangement structure 102, which can effectively reduce the size of the first battery cell arrangement structure 101. The distance between the electrode terminal 115 and the electrode terminal 115 of the second battery cell array structure 102 increases the energy density of the battery module 1.

For the second embodiment, the second cover 14 includes a first lower cover 141 and a second lower cover 142, the first supporting portion 131 is connected to the first lower cover 1311 through the first connecting portion 1311 The cover portion 141 is connected; and/or, the second supporting portion 132 is connected to the second lower cover portion 142 through the second connecting portion 1321.

In all the embodiments, the first connection portion 133 is located on the side of the first battery cell arrangement structure 101 away from the second battery cell arrangement structure 102, and the second connection portion 143 is located on the side of the second battery cell arrangement structure 102 away from the One side of the battery cell arrangement structure 101. The electrode terminal 115 of the first battery cell arrangement structure 101 faces away from the first connection part 133; the electrode terminal 115 of the second battery cell arrangement structure 102 faces away from the second connection part 143.

For example, as shown in FIGS. 12 to 13, in the fourth embodiment, the battery module 1 includes three battery cell arrangement structures 10, and another battery cell arrangement structure 10 is the third battery cell arrangement structure 103 The third battery cell arrangement structure 103 is arranged between the first battery cell arrangement structure 101 and the second battery cell arrangement structure 102. The first cover 13 also includes a third supporting portion 133. The third supporting portion 133 is disposed between the first supporting portion 131 and the second supporting portion 132. The third battery cell arrangement structure 103 and the third supporting portion 133 The supporting parts 133 are arranged oppositely.

The battery module 1 is not limited to include only one third battery cell arrangement structure 103, and may also include two or more third battery cell arrangement structures 103, that is, the battery module 1 has more than four battery cells. Array structure 10. Correspondingly, the first cover 13 may also be provided with more than two third supporting portions 133, and each third supporting portion 133 is respectively disposed opposite to a corresponding third battery cell arrangement structure 103.

For example, one end of the third supporting portion 133 is fixed to the first supporting portion 131, and the other end of the third supporting portion 133 is fixed to the second supporting portion 132. In other embodiments, the two ends of the third supporting portion 133 are respectively fixed to the first supporting portion 131 and the second supporting portion 132 by overlapping structures. Both ends of the third supporting portion 133 may be fixed to the first supporting portion 131 and the second supporting portion 132 by welding, riveting or bonding.

As shown in FIG. 14, in this embodiment, the multiple battery cells 11 of the battery cell arrangement structure 10 are sequentially placed on the first supporting portion 131 of the first cover 13, and the multiple battery cells 11 is fixed on the first supporting portion 131, and then connected to a plurality of bus bars 12, and then the first supporting portion 131 is used for transportation. At this time, since the first cover 13 is used for transportation, no additional components are needed, thereby increasing the energy density of the battery module 1.

As shown in FIG. 15 and FIG. 16, in this embodiment, the battery cell arrangement 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, and the plurality of battery cells 11 extend along They are arranged in the horizontal direction (the length direction indicated by the arrow x or the width direction indicated by the arrow y). The collection board 15 is located on one side of the battery cell arrangement structure 10 and is vertically arranged, and the collection board 15 is connected to the electrode terminals 115 of the battery cells 11 in the battery cell arrangement structure 10.

In this embodiment, the battery cell arrangement structure 10 further includes two end plates 16, which are respectively located on the plurality of battery cells 11 along the horizontal direction (the length direction indicated by the arrow x or the width indicated by the arrow y). Direction).

In a specific embodiment, the side surface of the battery cell 11 is glued to adhere to the adjacent battery cell 11, the two ends of the plurality of battery cells 11 are provided with end plates 16, and the battery cells 11 and the end plates 16 are glued. Make bonding. The multiple battery cells 11 are electrically connected through the bus bar 12.

As shown in FIG. 17, the battery cell 11 includes an electrode assembly 111, a battery case 112, an electrode terminal connector 113, a cap plate 114 and an electrode terminal 115. The battery case 112 may have a hexahedral shape or other shapes. The battery case 112 has an internal space accommodating the electrode assembly 111 and the electrolyte, and the battery case 112 has an opening. The electrode assembly 111 is contained in the battery case 112, the cover 114 covers the opening and is used to seal the electrode assembly 111 in the battery case 112, and the electrode assembly 111 and the electrode terminal 115 are electrically connected through the electrode terminal connector 113. In this embodiment, there are two electrode terminal connectors 113, namely, a positive terminal connector 113 and a negative terminal connector 113, respectively. The battery case 112 may be made of materials such as aluminum, aluminum alloy, or plastic.

The electrode assembly 111 is contained in the battery case 112, and the electrode assembly 111 includes a first pole piece 1111, a second pole piece 1112, and a diaphragm 1113 disposed between the first pole piece 1111 and the second pole piece 1112. The first pole piece 1111 may be a positive pole piece or a negative pole piece, and the second pole piece 1112 and the first pole piece 1111 have opposite polarities. Accordingly, the second pole piece 1112 is a negative pole piece or a positive pole piece. The diaphragm 1113 is an insulator between the first pole piece 1111 and the second pole piece 1112. The electrode assembly 111 may have a winding structure (as shown in FIG. 18) or a laminated structure (as shown in FIG. 19).

Illustratively, the first pole piece 1111 is used as a positive electrode piece, and the second pole piece 1112 is used as a negative electrode piece for description. Similarly, in other embodiments, the first pole piece 1111 may also be a negative pole piece, and the second pole piece 1112 is a positive pole piece. In addition, the positive electrode active material is coated on the coating area of the positive electrode sheet, and the negative electrode active material is coated on the coating area of the negative electrode sheet. The uncoated area extending from the coated area is used as a tab. The electrode assembly 111 includes two tabs, namely a positive tab and a negative tab. The positive tab extends from the coating area of the positive tab; the negative tab extends from the tab of the negative tab. The coating area extends out. The positive lug and the positive electrode terminal 115 are electrically connected through a positive terminal connector 113, and the negative lug and the negative electrode terminal 115 are electrically connected through a negative terminal connector 113.

The battery housing 112 has a substantially hexahedral structure. The battery housing 112 includes two first surfaces 1121 and two second surfaces 1122. The area of the first surface 1121 is larger than the area of the second surface 1122. In the battery module 1, the two second surfaces 1122 of each battery cell 11 face each other in a horizontal direction (for example, the length direction of the direction indicated by the arrow x), and the two first surfaces 1121 of each battery cell 11 Facing each other in the vertical direction (the direction indicated by the arrow z).

As shown in FIGS. 18 and 19, when the electrode assembly 111 is a wound structure, the electrode assembly 111 is flat, and the outer surface of the electrode assembly 111 includes two flat surfaces 1114, and the two flat surfaces 1114 are both vertical The directions (the direction indicated by the arrow z) face each other, that is, the flat surface 1114 and the first surface 1121 face each other. The electrode assembly 111 has a substantially hexahedral structure, and the flat surface 1114 is substantially parallel to the winding axis and is an outer surface with the largest area. The flat surface 1114 may be a relatively flat surface, and is not required to be a pure plane.

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

The electrode assembly 111 will inevitably expand along the thickness direction of the first pole piece 1111 during the charging and discharging process (in the electrode assembly 111 of the wound structure, the expansion force in the direction perpendicular to the flat surface 1114 is the largest; in the laminate In the electrode assembly 111 of the type structure, the expansion force is the largest along the stacking direction of the first pole piece 1111 and the second pole piece 1112).

In this embodiment, the electrode assembly 111 can be a wound structure or a laminated structure. When the electrode assembly 111 has a wound structure, the flat surface 1114 faces the vertical direction (the direction indicated by the arrow z). When the electrode assembly 111 has a laminated structure, the first pole piece 1111 and the second pole piece 1112 are stacked in the vertical direction (the direction indicated by the arrow z). It can be seen that no matter whether the electrode assembly 111 adopts a wound structure or a laminated structure, the direction in which the electrode assembly 111 applies the maximum expansion force to the battery casing 112 faces the vertical direction.

In the prior art, in the battery cell 11 of the battery module 1, the direction in which the electrode assembly 111 exerts the maximum expansion force on the battery housing 112 is all toward the horizontal direction, because the size of the battery module 1 in the horizontal direction is compared with that in the vertical direction. The size in the direction is much larger (for example, due to the limitation of the height of the vehicle chassis, more battery cells 11 need to be stacked in the horizontal direction, the expansion force accumulation is large), therefore, the existing battery module 1 suffers from the horizontal direction The expansion force is very large, so it is necessary to provide very thick end plates on both sides of the battery module 1 in the horizontal direction to resist the expansion force, and thicker end plates will reduce the energy density of the battery module 1. However, in this embodiment, the direction in which the electrode assembly 111 exerts the maximum expansion force on the battery housing 112 is toward the vertical direction, and the number of battery cells 11 stacked in the vertical direction is small. Therefore, compared with the prior art, The maximum expansion force of the battery module 1 can be greatly reduced.

In addition, since the battery cell 11 will generate gas inside the battery housing 112 during the charging and discharging process, the generated gas exerts a force on the battery housing 112, thereby increasing the outward expansion of the battery housing 112. Since the area of the first surface 1121 of the present application is larger than the area of the second surface 1122, and the two first surfaces 1121 of the battery cell 11 face each other in the vertical direction, the generated gas exerts an influence on the battery case 112 The direction of maximum force is also toward the vertical direction. Compared with the prior art, the maximum expansion force of the battery module 1 is further reduced.

One or more embodiments are exemplified by the pictures in the corresponding drawings. These exemplified descriptions do not constitute a limitation on the embodiments. Elements with the same reference numbers in the drawings are represented as similar elements. Unless otherwise stated, the figures in the attached drawings do not constitute a limitation of scale.

Claims (23)

1. A battery module, characterized in that it comprises:

   A battery cell arrangement structure (10), the battery cell arrangement structure (10) comprising a plurality of battery cells (11);

   The first cover (13); and

   A second cover (14), the first cover (13) is connected to the second cover (14), and the battery cell arrangement structure (10) is arranged on the first cover (13) And the second cover (14);

   Wherein, the first cover (13) includes a first supporting portion (131) and a second supporting portion (132), the first supporting portion (131) and the second supporting portion (132) ) Is a split structure;

   The battery module (1) includes more than two battery cell arrangement structures (10), one of the battery cell arrangement structures (10) is a first battery cell arrangement structure (101), and the other is The battery cell arrangement structure (10) is the second battery cell arrangement structure (102);

   The first battery cell arrangement structure (101) is arranged opposite to the first supporting portion (131), and the second battery cell arrangement structure (102) is opposite to the second supporting portion (132) Set up.
2. The battery module according to claim 1, wherein the second cover (14) comprises a first lower cover (141) and a second lower cover (142), and the first lower cover ( 141) and the second lower cover portion (142) are split structures, and the first supporting portion (131) and the first lower cover portion (141) are respectively located in the first battery cell arrangement structure (101), and the first supporting portion (131) is located above the first lower cover portion (141); and/or, the second supporting portion (132) and the first The two lower cover portions (142) are respectively located on both sides of the second battery cell arrangement structure (102), and the second supporting portion (132) is located above the second lower cover portion (142).
3. The battery module according to claim 2, characterized in that the first receiving cavity (130) is formed between the first supporting portion (131) and the first lower cover portion (141), and the The first battery cell arrangement structure (101) is arranged in the first accommodating cavity (130); and/or, between the second supporting portion (132) and the second lower cover portion (132) The second receiving cavity (140) is formed, and the second battery cell arrangement structure (102) is arranged in the second receiving cavity (140).
4. The battery module according to claim 2, wherein the first supporting portion (131) and the second supporting portion (132) are connected by welding, riveting, bonding or bolting; And/or, the first lower cover part (141) and the second lower cover part (142) are connected by welding, riveting, bonding or bolting.
5. The battery module according to claim 2, characterized in that: the battery module (1) further comprises a fixing member (17), and the first lower cover portion (141) is connected to the fixing member (17) through the fixing member (17). The second lower cover part (142) is connected.
6. The battery module according to claim 5, characterized in that: the fixing member (17) is a water-cooled plate, and the first lower cover portion (141) and the second lower cover portion (142) are connected to each other through thermally conductive glue. The fixing member (17) is fixed.
7. The battery module according to claim 2, wherein the first battery cell arrangement structure (101) is fixed to the first lower cover part (141) by glue, and the second battery cell arrangement structure (102) Fix to the second lower cover part (142) by glue.
8. The battery module according to claim 2, characterized in that: an end of the first receiving cavity (130) facing the second receiving cavity (140) is provided with a first opening, and the second receiving cavity (140) A second opening is provided at one end facing the first receiving cavity (130), and the first opening and the second opening face each other.
9. The battery module according to claim 2, characterized in that: the battery module (1) further comprises a first connecting portion (1311) arranged vertically, and the first connecting portion (1311) is located in the first battery The cell arrangement structure (101) is away from the side of the second battery cell arrangement structure (102), and the first supporting portion (131) is connected to the first lower portion through the first connecting portion (1311). The cover (141) is connected; and/or,

   The battery module (1) also includes a second connecting portion (1321) arranged vertically, and the second connecting portion (1321) is located in the second battery cell arrangement (102) structure away from the first battery cell. On one side of the body arrangement structure (101), the second supporting portion (132) is connected to the second lower cover portion (142) through the second connecting portion (1321).
10. The battery module according to claim 1 or 2, characterized in that: the battery cell (11) comprises a battery casing (112), a cover plate (114) and electrode terminals (115), and the cover plate (114) ) Is connected to the battery casing (112), the electrode terminal (115) is arranged on the cover plate (114) and is electrically connected to the bus bar (12); the first battery cell arrangement structure The electrode terminal (115) of (101) faces or faces away from the second battery cell arrangement structure (102);

    And/or, the electrode terminal (115) of the second battery cell arrangement structure (102) faces or faces away from the first battery cell arrangement structure (101).
11. The battery module according to claim 10, wherein: the battery module (1) further comprises a first connecting portion (1311) arranged vertically, and the first connecting portion (1311) is located on the first battery cell The side of the arrangement structure (101) away from the second battery cell arrangement structure (102), the electrode terminal (115) of the first battery cell arrangement structure (101) faces the second battery cell Body arrangement structure (102); and/or,

    The battery module (1) further includes a second connecting portion (1321) arranged vertically, and the second connecting portion (1321) is located on the second battery cell arrangement structure (102) away from the first battery On one side of the cell arrangement structure (101), the electrode terminal (115) of the second battery cell arrangement structure (102) faces the first battery cell arrangement structure (101).
12. The battery module according to claim 1, wherein: the battery module (1) comprises more than three battery cell arrangement structures (10), and another of the battery cell arrangement structures (10) is the first Three battery cell arrangement structure (103), the third battery cell arrangement structure (103) is arranged between the first battery cell arrangement structure (101) and the second battery cell arrangement structure (102) between;

    The first cover (13) further includes a third supporting portion (133), and the third battery cell arrangement structure (103) is arranged opposite to the third supporting portion (133).
13. The battery module according to claim 12, wherein: one end of the third supporting portion (133) is fixed to the first supporting portion (131), and the other of the third supporting portion (133) One end is fixed to the second supporting portion (132).
14. The battery module according to claim 1, wherein: the first cover (13) further comprises a first fixing portion (134) and a second fixing portion (135), the first fixing portion (134) is connected to The first supporting portion (131) extends in a direction away from the second battery cell arrangement structure (102), and the second fixing portion (135) is connected to the second supporting portion (132) And extend in a direction away from the first battery cell arrangement structure (101);

    The second cover (14) includes a main board (1400), a third fixing portion (144) and a fourth fixing portion (145), the third fixing portion (144) and the fourth fixing portion (145) Respectively connected to both ends of the main board (1400);

    The first fixing portion (134) and the third fixing portion (144) are arranged oppositely and fixedly connected, and the second fixing portion (135) and the fourth fixing portion (145) are arranged oppositely and fixedly connected.
15. The battery module according to claim 1, wherein: the battery module (1) further comprises a collection board (15), the collection board (15) is arranged vertically, the collection board (15) and the battery unit The bodies (11) are connected.
16. The battery module according to any one of claims 1-15, the battery cell (11) further comprises an electrode assembly (111), and the electrode assembly (111) is accommodated in the battery casing (112), The electrode assembly (111) includes a first pole piece (1111), a second pole piece (1112), and a diaphragm (1111) arranged between the first pole piece (1111) and the second pole piece (1112). 1113);

    The electrode assembly (111) has a winding structure and is flat, and the outer surface of the electrode assembly (111) includes two flat surfaces (1114), and the two flat surfaces (1114) are mutually in the vertical direction. Face; or,

    The electrode assembly (111) has a laminated structure, and the first pole piece (1111), the diaphragm (1113) and the second pole piece (1112) are stacked in a vertical direction.
17. The battery module according to claims 1-15, wherein: the first battery cell arrangement structure (101) is fixed to the first supporting portion (131) by glue, and the second battery cell arrangement structure (102) Fixed to the second supporting portion (132) by glue.
18. The battery module according to any one of claims 1-15, wherein: the first supporting portion (131) and the second supporting portion (132) are connected by welding, riveting or bonding.
19. The battery module according to any one of claims 1-15, wherein: the battery module (1) further comprises a fixing member (17), and the first supporting portion (131) passes through the fixing member (17) It is connected with the second supporting portion (132).
20. The battery module according to claim 19, wherein: the fixing member (17) is a water-cooled plate, and the first supporting portion (131) and the second supporting portion (132) are connected to each other through thermally conductive glue The fixing member (17) is fixed.
21. A battery pack, which includes:

    Containment box, and

    A plurality of battery modules (1) according to any one of claims 1-22 are arranged in the containing box.
22. The battery pack according to claim 21, wherein: the first cover (13) includes a first fixing portion (134) and a second fixing portion (135), and the first fixing portion (134) is connected to the The first supporting portion (131), the second fixing portion (135) is connected to the second supporting portion (132);

    The second cover (14) includes a main board (140), a third fixing portion (144), and a fourth fixing portion (145). The third fixing portion (144) and the fourth fixing portion (145) Respectively connected to both ends of the main board (140);

    The containing 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), the first fixed beam (31) ) And the second fixed beam (32) protrude from the surface of the box (3), the first fixed portion (134), the third fixed portion (144) and the first fixed beam (31) The three are arranged oppositely, the first fixing portion (134), the third fixing portion (144) are fixed on the first fixing beam (31), the second fixing portion (135), The fourth fixing portion (145) and the second fixing beam (32) are arranged opposite to each other, and the second fixing portion (135) and the fourth fixing portion (145) are fixed to the second fixing beam ( 32) On.
23. The battery pack according to claim 22, wherein: the battery pack further comprises a bead (4), and the first fixing portion (134) and the third fixing portion (144) are pressed against the bead (4) ) And the first fixed beam (31), the second fixed portion (135) and the fourth fixed portion (145) are pressed against the bead (4) and the second fixed beam ( 32) between.

Images