CN216671793U

CN216671793U - Square lithium ion battery module composite structure

Info

Publication number: CN216671793U
Application number: CN202023164102.7U
Authority: CN
Inventors: 沈华平; 孔令兵; 杨桃
Original assignee: Jiangsu Chunlan Clean Energy Academy Co ltd
Current assignee: Jiangsu Chunlan Clean Energy Academy Co ltd
Priority date: 2020-12-25
Filing date: 2020-12-25
Publication date: 2022-06-03
Anticipated expiration: 2030-12-25

Abstract

The utility model discloses a square lithium ion battery module combination structure which mainly comprises a plurality of batteries (1), wherein a plastic insulation sheet I (4) is arranged between every two batteries (1), the adjacent batteries (1) are bonded together by the plastic insulation sheet I (4), a battery-to-battery connecting device is arranged between every two batteries (1), the batteries (1) are connected together in series by the battery-to-battery connecting device, the batteries (1) are arranged into a battery module after being bonded by the plastic insulation sheet I (4) and connected in series by the battery-to-battery connecting device, a plastic end plate I (2) and a plastic end plate II (3) are respectively arranged at two sides of the battery module, and the battery module is fixed with the plastic end plate I (2) and the plastic end plate II (3). The utility model not only can adapt to different battery installation spaces, but also has simple structure, convenient installation and low manufacturing cost.

Description

Square lithium ion battery module composite structure

Technical Field

The utility model relates to a square lithium ion battery module combination structure, in particular to a combination structure for combining a plurality of lithium ion batteries into a battery module.

Background

And as the core component of the new energy automobile: the performance of the power supply system is the key for realizing the development and planning of the new energy automobile industry. The battery cell grouping technology is one of the key technologies of the power supply system. The space for installing the battery on the electric automobile is limited, how to combine the batteries as much as possible in the limited space increases the capacity of the battery, the endurance mileage of the electric automobile is increased, and meanwhile, the safety and reliability of the battery in road running application are ensured, which is the key content of the design of a power supply system.

Disclosure of Invention

The square lithium ion battery module combination structure provided by the utility model not only can adapt to different battery installation spaces, but also has the advantages of simple structure, convenience in installation and low manufacturing cost.

The utility model adopts the following technical scheme: a square lithium ion battery module combination structure mainly comprises a plurality of batteries, wherein a plastic insulation sheet I is arranged between every two batteries, the adjacent batteries are bonded together through the plastic insulation sheet I, a connecting device between every two batteries is arranged between the batteries, the batteries are connected in series through the connecting device between the batteries, the batteries are arranged to form a battery module after being bonded through the plastic insulation sheet I and connected in series through the connecting device between the batteries, a plastic end plate I and a plastic end plate II are arranged on two sides of the battery module respectively, and the battery module is fixed with the plastic end plate I and the plastic end plate II.

The plastic end plate I is opposite to a left battery in the battery module, a plastic insulation sheet II is arranged between the plastic end plate I and the left battery in the battery module, the outer surface of the left battery in the battery module is bonded with the inner surface of the plastic end plate I through the plastic insulation sheet II, the plastic end plate II is opposite to the right battery in the battery module, a plastic insulation sheet III is arranged between the plastic end plate II and the right battery in the battery module, and the outer surface of the right battery in the battery module is bonded with the inner surface of the plastic end plate II through the plastic insulation sheet III.

The bottom of the plastic end plate I is provided with a U-shaped mounting hole I and a U-shaped mounting hole II, the U-shaped mounting hole I of the plastic end plate I and the U-shaped mounting hole II of the plastic end plate I are mutually symmetrical, both sides of the U-shaped mounting hole I of the plastic end plate I and both sides of the U-shaped mounting hole II of the plastic end plate I are provided with mounting hole reinforcing ribs, the top of the plastic end plate I is provided with an upper vertical clamp fillet I and an upper vertical clamp fillet II, the upper vertical clamp fillet I and the upper vertical clamp fillet II are mutually symmetrical, both sides of the upper vertical clamp fillet I and both sides of the upper vertical clamp fillet II of the plastic end plate I are provided with vertical clamp limiting blocks I, the bottom of the plastic end plate I is provided with a lower vertical clamp fillet I and a lower vertical clamp fillet II, the lower vertical clamp fillet I and the lower vertical clamp fillet II of the plastic end plate I are mutually symmetrical, one side of the lower vertical clamp fillet I of the plastic end plate I is provided with a vertical clamp limiting block II, the other side of the lower vertical hoop fillet I of the plastic end plate I is a U-shaped mounting hole I, a mounting hole reinforcing rib is arranged on one side adjacent to the lower vertical hoop fillet I of the plastic end plate I, one side of the lower vertical hoop fillet II of the plastic end plate I is a vertical hoop limiting block II, the other side of the lower vertical hoop fillet II of the plastic end plate I is a mounting hole reinforcing rib arranged on one side adjacent to the U-shaped mounting hole II of the plastic end plate I and the lower vertical hoop fillet II of the plastic end plate I, a transverse hoop fillet I and a transverse hoop fillet II are respectively arranged on the left side and the right side of the plastic end plate I, a U-shaped mounting hole I and a U-shaped mounting hole II are arranged at the bottom of the plastic end plate II, the U-shaped mounting hole I and the U-shaped mounting hole II of the plastic end plate II are mutually symmetrical, mounting hole reinforcing ribs are arranged on both sides of the U-shaped mounting hole I and the U-shaped mounting hole II of the plastic end plate II, an upper vertical hoop fillet I and an upper vertical hoop fillet II are arranged at the top of the plastic end plate II, an upper vertical hoop fillet I and an upper vertical hoop fillet II of a plastic end plate II are mutually symmetrical, two sides of the upper vertical hoop fillet I and two sides of the upper vertical hoop fillet II of the plastic end plate II are provided with vertical hoop limiting blocks I, the bottom of the plastic end plate II is provided with a lower vertical hoop fillet I and a lower vertical hoop fillet II, the lower vertical hoop fillet I and the lower vertical hoop fillet II of the plastic end plate II are mutually symmetrical, wherein one side of the lower vertical hoop fillet I of the plastic end plate II is provided with the vertical hoop limiting block II, the other side of the lower vertical hoop fillet I of the plastic end plate II is provided with a mounting hole reinforcing rib at one side adjacent to the U-shaped mounting hole I and the lower vertical hoop fillet I of the plastic end plate II, one side of the lower vertical hoop fillet II of the plastic end plate II is provided with the vertical hoop limiting block II, the other side of the lower vertical hoop fillet II of the plastic end plate II is provided with a mounting hole II adjacent to the lower vertical hoop reinforcing rib of the plastic end plate II, be equipped with horizontal clamp fillet I and horizontal clamp fillet II respectively on the left side of plastics end plate II and right side, have the clamp combination at the outside cover of plastics end plate I, battery module and plastics end plate II, and the clamp combination is in the same place plastics end plate I, battery module and II fixed connection of plastics end plate.

The clamp combination set up to vertical clamp combination, vertical clamp combination include vertical plastics clamp I and vertical plastics clamp II, vertical plastics clamp I and vertical plastics clamp II cover are at plastics end plate I, the outside of battery module and plastics end plate II, wherein vertical plastics clamp I passes last vertical clamp fillet I of plastics end plate I, the last vertical clamp fillet I of lower vertical clamp fillet I and plastics end plate II, with plastics end plate I behind lower vertical clamp fillet I, battery module and II vertical fixings of plastics end plate, vertical plastics clamp II passes last vertical clamp fillet II of plastics end plate I, the last vertical clamp fillet II of lower vertical clamp fillet II and plastics end plate II, down with plastics end plate I behind vertical clamp fillet II, II vertical fixings together of battery module and plastics end plate II. The clamp combination set up to horizontal plastics clamp, horizontal plastics clamp passes horizontal clamp fillet I and horizontal clamp fillet II of plastics end plate I and plastics end plate II horizontal clamp fillet I and horizontal clamp fillet II with plastics end plate I, battery module and plastics end plate II horizontal fixation together. The battery connecting device comprises an upper layer connecting device and a lower layer connecting device, the upper layer connecting device is arranged on the upper portion of the side face of the battery module, the upper layer connecting device comprises a plurality of upper battery connecting pieces, two adjacent batteries are connected in series through an upper nut and then fixed through a lower nut through each battery connecting piece, the lower layer connecting device is arranged on the lower portion of the side face of the battery module, the lower layer connecting device comprises a plurality of lower battery connecting pieces, and the two adjacent batteries are connected in series through a lower nut and then fixed through each lower battery connecting piece. The connecting sheets between the upper batteries and the connecting sheets between the lower batteries are distributed in a staggered manner. The upper nut and the lower nut are flange nuts. The surface of the plastic insulating thin sheet I, the surface of the plastic insulating thin sheet II and the surface of the plastic insulating thin sheet III are provided with non-drying glue layers, and the plastic insulating thin sheet I, the plastic insulating thin sheet II and the plastic insulating thin sheet III are made of PET materials. The plastic end plate I and the plastic end plate II are made of ABS materials.

The utility model has the following beneficial effects: by adopting the technical scheme, the lithium ion batteries can be connected in series or in parallel on the same layer to form the battery module, and the upper layer and the lower layer of the batteries can be arranged and combined, so that the space for arranging and combining the batteries is fully expanded. According to the utility model, a plastic insulating sheet I is arranged between every two batteries, the adjacent batteries are bonded together by the plastic insulating sheet I, a plastic insulating sheet II is arranged between the plastic end plate I and the battery on the left side in the battery module, a plastic insulating sheet III is arranged between the plastic end plate II and the battery on the right side in the battery module, adhesive layers are arranged on the surface of the plastic insulating sheet I, the surface of the plastic insulating sheet II and the surface of the plastic insulating sheet III, and the plastic insulating sheet I, the plastic insulating sheet II and the plastic insulating sheet III are made of PET materials, so that the insulation of the batteries is ensured, and the mutual serial position between the batteries is also prevented. The plastic end plate is made of flame-retardant plastic with excellent high-low temperature performance and insulating performance. The plastic end plate is provided with a vertical clamp fillet, a vertical clamp limiting block, a transverse clamp fillet and a transverse clamp limiting block, can be fastened by a vertical plastic clamp and a transverse plastic clamp, and can be flexibly used according to different installation spaces. And the bottom of the plastic end plate is provided with a mounting U-shaped mounting hole and a mounting hole reinforcing rib for fixing the battery module. The batteries can be randomly combined in series and parallel according to requirements, and the expansibility of the module is strong. The plastic end plate I is provided with the vertical clamp limiting block I, the vertical clamp limiting block II and the mounting hole reinforcing ribs, so that the longitudinal plastic clamp I and the longitudinal plastic clamp II can be prevented from moving through the plastic end plate I in a crossing mode, the plastic end plate II is provided with the vertical clamp limiting block I, the vertical clamp limiting block II and the mounting hole reinforcing ribs, so that the longitudinal plastic clamp I and the longitudinal plastic clamp II can be prevented from moving through the plastic end plate II in a crossing mode, the U-shaped mounting hole I, the U-shaped mounting hole II and the mounting hole reinforcing ribs are arranged at the bottom of the plastic end plate I, and the U-shaped mounting hole I, the U-shaped mounting hole II and the mounting hole reinforcing ribs are arranged at the bottom of the plastic end plate II.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural view of the plastic end plate i of the present invention.

Fig. 3 is a schematic structural diagram of the plastic end plate ii of the present invention.

Detailed Description

In the figures 1, 2 and 3, the utility model provides a square lithium ion battery module combination structure, which mainly comprises a plurality of batteries 1, the embodiment mainly comprises eight batteries 1, a plastic insulating sheet I4 is arranged between every two batteries 1, the plastic insulating sheet I4 bonds the adjacent batteries 1 together, the surface of the plastic insulating sheet I4 is provided with an adhesive layer, the plastic insulating sheet I4 bonds the adjacent batteries 1 together through an adhesive layer, an inter-battery connecting device is arranged between every two batteries 1, the inter-battery connecting device connects the eight batteries 1 in series, the eight batteries 1 are arranged to form a battery module after the bonding of the plastic insulating sheet I4 and the series connection of the inter-battery connecting device, two sides of the battery module are respectively provided with a plastic end plate I2 and a plastic end plate II 3, the battery module is fixed with the plastic end plate I2 and the plastic end plate II 3, the plastic end plate I2 is opposite to a left battery 1 in the battery module, a plastic insulating sheet II 5 is arranged between the plastic end plate I2 and the left battery 1 in the battery module, the outer surface of the left battery 1 in the battery module is bonded with the inner surface of the plastic end plate I2 through the plastic insulating sheet II 5, an adhesive tape layer is arranged on the surface of the plastic insulating sheet II 5, the outer surface of the left battery 1 in the battery module is bonded with the inner surface of the plastic end plate I2 through the plastic insulating sheet II 5, the plastic end plate II 3 is opposite to the right battery 1 in the battery module, a plastic insulating sheet III 6 is arranged between the plastic end plate II 3 and the right battery 1 in the battery module, the outer surface of the right battery 1 in the battery module is bonded with the inner surface of the plastic end plate II 3 through the adhesive tape layer, and the adhesive tape layer is arranged on the surface of the plastic insulating sheet III 6, the outer surface of a battery 1 on the right side in a battery module is bonded with the inner surface of a plastic end plate II 3 through a non-drying adhesive layer by a plastic insulating sheet III 6, the bottom of the plastic end plate I2 is provided with a U-shaped mounting hole I7 and a U-shaped mounting hole II 8, the U-shaped mounting hole I7 of the plastic end plate I2 and the U-shaped mounting hole II 8 of the plastic end plate I2 are mutually symmetrical, both sides of the U-shaped mounting hole I7 of the plastic end plate I2 and both sides of the U-shaped mounting hole II 8 of the plastic end plate I2 are provided with mounting hole reinforcing ribs 9, the top of the plastic end plate I2 is provided with an upper vertical clamp fillet I10 and an upper vertical clamp fillet II 11, the upper vertical clamp fillet I10 and the upper vertical clamp fillet II 11 are mutually symmetrical, both sides of the upper vertical clamp fillet I10 and both sides of the upper vertical clamp fillet II 11 of the plastic end plate I2 are provided with vertical clamp limiting blocks I12, the bottom of the plastic end plate I2 is provided with a lower vertical clamp fillet I13 and a lower vertical clamp fillet II 14, the lower vertical hoop fillet I13 and the lower vertical hoop fillet II 14 of the plastic end plate I2 are symmetrical to each other, wherein one side of the lower vertical hoop fillet I13 of the plastic end plate I2 is a vertical hoop limiting block II 15, the other side of the lower vertical hoop fillet I13 of the plastic end plate I2 is a U-shaped mounting hole I7 and a mounting hole reinforcing rib 9 on the adjacent side of the lower vertical hoop fillet I13 of the plastic end plate I2, one side of the lower vertical hoop fillet II 14 of the plastic end plate I2 is a vertical hoop limiting block II 15, the other side of the lower vertical hoop fillet II 14 of the plastic end plate I2 is a mounting hole II 8 of the plastic end plate I2 and a mounting hole reinforcing rib 9 on the adjacent side of the lower vertical hoop fillet II 14 of the plastic end plate I2, the left side and the right side of the plastic end plate I2 are respectively provided with a transverse hoop fillet I16 and a transverse hoop fillet II 17, the bottom of the plastic end plate II 3 is provided with a U-shaped mounting hole I7 and a U-shaped mounting hole II 8, the U-shaped mounting hole I7 and the U-shaped mounting hole II 8 of the plastic end plate II 3 are mutually symmetrical, mounting hole reinforcing ribs 9 are arranged on two sides of the U-shaped mounting hole I7 of the plastic end plate II 3 and two sides of the U-shaped mounting hole II 8 of the plastic end plate II 3, an upper vertical hoop fillet I10 and an upper vertical hoop fillet II 11 are arranged at the top of the plastic end plate II 3, an upper vertical hoop fillet I10 and an upper vertical hoop fillet II 11 of the plastic end plate II 3 are mutually symmetrical, vertical hoop limiting blocks I12 are arranged on two sides of the upper vertical hoop fillet I10 and two sides of the upper vertical hoop fillet II 11 of the plastic end plate II 3, a lower vertical hoop fillet I13 and a lower vertical hoop fillet II 14 are arranged at the bottom of the plastic end plate II 3, the lower vertical hoop I13 and the lower vertical hoop fillet II 14 of the plastic end plate II 3 are mutually symmetrical, wherein one side of the lower vertical hoop I13 of the plastic end plate II 3 is a vertical hoop limiting block II 15, the other side of a lower vertical hoop fillet I13 of a plastic end plate II 3 is provided with a U-shaped mounting hole I7 and a mounting hole reinforcing rib 9 on one side adjacent to the lower vertical hoop fillet I13 of the plastic end plate II 3, one side of a lower vertical hoop fillet II 14 of the plastic end plate II 3 is provided with a vertical hoop limiting block II 15, the other side of a lower vertical hoop fillet II 14 of the plastic end plate II 3 is provided with a U-shaped mounting hole II 8 of the plastic end plate II 3 and a mounting hole reinforcing rib 9 on one side adjacent to the lower vertical hoop fillet II 14 of the plastic end plate II 3, the left side and the right side of the plastic end plate II 3 are respectively provided with a transverse hoop fillet I16 and a transverse hoop fillet II 17, a hoop combination is sleeved outside the plastic end plate I2, the battery module and the plastic end plate II 3, the hoop combination fixedly connects the plastic end plate I2, the battery module and the plastic end plate II 3 together, the hoop combination is set as a longitudinal hoop combination, the longitudinal hoop combination comprises a longitudinal plastic hoop I18 and a longitudinal plastic hoop II 19, wherein the longitudinal plastic hoop I18 and the longitudinal plastic hoop II 19 are sleeved outside a plastic end plate I2, a battery module and a plastic end plate II 3, the longitudinal plastic hoop I18 penetrates through an upper vertical hoop fillet I10 of the plastic end plate I2, a lower vertical hoop fillet I13 and an upper vertical hoop fillet I10 of the plastic end plate II 3, the plastic end plate I2, the battery module and the plastic end plate II 3 are longitudinally fixed after the lower vertical hoop fillet I13, the longitudinal plastic hoop II 19 penetrates through an upper vertical hoop fillet II 11 of the plastic end plate I2, a lower vertical hoop fillet II 14 and an upper vertical hoop fillet II 11 of the plastic end plate II 3, the plastic end plate I2, the battery module and the plastic end plate II 3 are longitudinally fixed together after the lower vertical hoop fillet II 14, the connecting device between batteries comprises an upper connecting device and a lower connecting device, the upper layer connecting device is arranged on the upper part of the side face of the battery module and comprises a plurality of upper battery connecting sheets 20, the upper layer connecting device of the embodiment comprises three upper battery connecting sheets 20, each battery connecting sheet 20 is used for serially connecting two adjacent batteries 1 and then fixing the two adjacent batteries 1 through an upper nut 21, the lower layer connecting device is arranged on the lower part of the side face of the battery module and comprises a plurality of lower battery connecting sheets 22, the lower layer connecting device of the embodiment comprises three lower battery connecting sheets 22, each lower battery connecting sheet 22 is used for serially connecting two adjacent batteries 1 and then fixing the two adjacent batteries 1 through a lower nut 23, the three upper battery connecting sheets 20 and the three lower battery connecting sheets 22 are distributed in a staggered mode, the upper nuts 21 and the lower nuts 23 are flange nuts, and the plastic insulating sheets I4, the plastic insulating sheets II 5 and the plastic insulating sheets III 6 are made of PET materials, the plastic end plate I2 and the plastic end plate II 3 are made of ABS materials.

The using method of the utility model comprises the following steps: the utility model longitudinally fixes a plastic end plate I2, a battery module and a plastic end plate II 3 after a longitudinal plastic hoop I18 passes through an upper vertical hoop fillet I10 and a lower vertical hoop fillet I13 of a plastic end plate I2 and an upper vertical hoop fillet I10 and a lower vertical hoop fillet I13 of the plastic end plate II 3, longitudinally fixes the plastic end plate I2, the battery module and the plastic end plate II 3 together after a longitudinal plastic hoop II 19 passes through an upper vertical hoop fillet II 11 and a lower vertical hoop fillet II 14 of the plastic end plate I2 and an upper vertical hoop fillet II 11 and a lower vertical hoop fillet II 14 of the plastic end plate II 3, each inter-battery connecting sheet 20 connects two adjacent batteries 1 in series and then fixes the two adjacent batteries 1 through an upper nut 21, a lower layer connecting device is arranged at the lower part of the side surface of the battery module, each inter-battery connecting sheet 22 connects two adjacent batteries 1 in series and then fixes the two adjacent batteries 1 through a lower nut 23, last vertical clamp fillet I10 both sides of plastics end plate I2 and the both sides of going up vertical clamp fillet II 11 all are equipped with vertical clamp stopper I12, lower vertical clamp fillet II 14 one side of plastics end plate I2 is vertical clamp stopper II 15, lower vertical clamp fillet II 14 opposite side of plastics end plate I2 is the U-shaped mounting hole II 8 of plastics end plate I2 and the mounting hole strengthening rib 9 of the adjacent one side of lower vertical clamp fillet II 14 of plastics end plate I2, can prevent like this that vertical plastics clamp I18 and vertical plastics clamp II 19 from producing the cluster through plastics end plate I2, the last vertical clamp fillet I10 both sides of plastics end plate II 3 and the both sides of last vertical clamp fillet II 11 all are equipped with vertical clamp stopper I12, lower vertical fillet clamp II 14 one side of plastics end plate II 3 are vertical stopper II 15, the U-shaped mounting hole 8 and the plastics end plate II 3 that the lower vertical clamp fillet II 14 opposite side of plastics end plate II 3 is plastics end plate II 3 are the U-shaped mounting hole 8 and the plastics end plate II 3 of plastics end plate II 3 The mounting hole reinforcing rib 9 on the adjacent side of the lower vertical hoop fillet II 14 can prevent the vertical plastic hoop I18 and the vertical plastic hoop II 19 from moving through the plastic end plate II 3. The clamp combination of the utility model can also be configured as a transverse plastic clamp which passes through a transverse clamp fillet I16 and a transverse clamp fillet II 17 of the plastic end plate I2 and a transverse clamp fillet I16 and a transverse clamp fillet II 17 of the plastic end plate II 3 to transversely fix the plastic end plate I2, the battery module and the plastic end plate II 3 together. When needs are fixed battery module, the bottom that can be equipped with U-shaped mounting hole I7 and U-shaped mounting hole II 8 through the bottom of plastics end plate I2 and plastics end plate II 3 is equipped with U-shaped mounting hole I7 and U-shaped mounting hole II 8 and inserts locking connecting piece and fix.

Claims

1. A square lithium ion battery module combination structure is characterized by mainly comprising a plurality of batteries (1), wherein a plastic insulation sheet I (4) is arranged between every two batteries (1), the adjacent batteries (1) are bonded together by the plastic insulation sheet I (4), a battery connecting device is arranged between every two batteries (1), the batteries (1) are connected in series by the battery connecting device, the batteries (1) are bonded by the plastic insulation sheet I (4) and connected in series to form a battery module, a plastic end plate I (2) and a plastic end plate II (3) are respectively arranged on two sides of the battery module, and the battery module is fixed with the plastic end plate I (2) and the plastic end plate II (3).

2. The square lithium ion battery module combined structure of claim 1, wherein the plastic end plate I (2) is opposite to the battery (1) on the left side in the battery module, a plastic insulating sheet II (5) is arranged between the plastic end plate I (2) and the battery (1) on the left side in the battery module, the plastic insulating sheet II (5) bonds the outer surface of the battery (1) on the left side in the battery module and the inner surface of the plastic end plate I (2), the plastic end plate II (3) is opposite to the battery (1) on the right side in the battery module, a plastic insulating sheet III (6) is arranged between the plastic end plate II (3) and the battery (1) on the right side in the battery module, and the plastic insulating sheet III (6) bonds the outer surface of the battery (1) on the right side in the battery module and the inner surface of the plastic end plate II (3).

3. The square lithium ion battery module combination structure of claim 1, which is characterized in that the bottom of the plastic end plate I (2) is provided with a U-shaped mounting hole I (7) and a U-shaped mounting hole II (8), the U-shaped mounting hole I (7) of the plastic end plate I (2) and the U-shaped mounting hole II (8) of the plastic end plate I (2) are mutually symmetrical, both sides of the U-shaped mounting hole I (7) of the plastic end plate I (2) and both sides of the U-shaped mounting hole II (8) of the plastic end plate I (2) are provided with mounting hole reinforcing ribs (9), the top of the plastic end plate I (2) is provided with an upper vertical hoop fillet I (10) and an upper vertical hoop fillet II (11), the upper vertical hoop fillet I (10) and the upper vertical hoop II (11) are mutually symmetrical, both sides of the upper vertical fillet I (10) and both sides of the upper vertical hoop II (11) of the plastic end plate I (2) are provided with vertical limiting blocks (12), the bottom of plastics end plate I (2) is equipped with down vertical clamp fillet I (13) and lower vertical clamp fillet II (14), the lower vertical clamp fillet I (13) and the lower vertical clamp fillet II (14) of plastics end plate I (2) are symmetrical each other, wherein lower vertical clamp fillet I (13) one side of plastics end plate I (2) is vertical clamp stopper II (15), lower vertical clamp fillet I (13) opposite side of plastics end plate I (2) is the mounting hole strengthening rib (9) of the lower vertical clamp fillet I (13) adjacent one side of U-shaped mounting hole I (7) and plastics end plate I (2), lower vertical clamp fillet II (14) one side of plastics end plate I (2) is vertical clamp stopper II (15), the lower vertical clamp fillet II (14) opposite side of plastics end plate I (2) is the mounting hole strengthening rib II (8) of the U-shaped mounting hole II (8) of plastics end plate I (2) and the mounting hole strengthening rib (14) adjacent one side of the lower vertical clamp fillet II (14) of plastics end plate I (2) (9) Left side and right side at plastic end plate I (2) are equipped with horizontal clamp fillet I (16) and horizontal clamp fillet II (17) respectively, the bottom of plastic end plate II (3) is equipped with U-shaped mounting hole I (7) and U-shaped mounting hole II (8), U-shaped mounting hole I (7) and U-shaped mounting hole II (8) mutual symmetry of plastic end plate II (3), U-shaped mounting hole I (7) both sides of plastic end plate II (3) and U-shaped mounting hole II (8) both sides of plastic end plate II (3) all are equipped with mounting hole strengthening rib (9), plastic end plate II (3) top is equipped with vertical clamp fillet I (10) and last vertical fillet II (11), last vertical clamp fillet I (10) and last vertical fillet II (11) mutual symmetry of plastic end plate II (3), the both sides of last vertical clamp fillet I (10) and the both sides of last vertical clamp fillet II (11) of plastic end plate II (3) all are equipped with vertical stopper (I (10), (I (17), (2) are located in the bottom of plastic end plate II 12) The bottom of plastics end plate II (3) is equipped with down I (13) of vertical clamp fillet and lower II (14) of vertical clamp fillet, the lower I (13) of vertical clamp fillet and lower II (14) of vertical clamp fillet of plastics end plate II (3) symmetry each other, wherein lower I (13) one side of vertical clamp fillet of plastics end plate II (3) is II (15) of vertical clamp stopper, lower I (13) opposite side of vertical clamp fillet of plastics end plate II (3) is the mounting hole strengthening rib (9) of the adjacent one side of lower vertical clamp fillet I (13) of U-shaped mounting hole I (7) and plastics end plate II (3), lower II (14) one side of vertical clamp fillet of plastics end plate II (3) is II (15) of vertical clamp stopper, lower II (14) opposite side of lower vertical clamp fillet of plastics end plate II (3) is the U-shaped mounting hole II (8) of plastics end plate II (3) and the mounting hole of the adjacent one side of lower clamp fillet II (14) of plastics end plate II (3) Strengthening rib (9), left side and the right side at plastics end plate II (3) are equipped with horizontal clamp fillet I (16) and horizontal clamp fillet II (17) respectively, have the clamp combination at the outside cover of plastics end plate I (2), battery module and plastics end plate II (3), and the clamp combination is in the same place plastics end plate I (2), battery module and plastics end plate II (3) fixed connection.

4. The square lithium ion battery module composite structure of claim 3, characterized by that the clamp combination set up to vertical clamp combination, vertical clamp combination include vertical plastics clamp I (18) and vertical plastics clamp II (19), the outside at plastics end plate I (2), battery module and plastics end plate II (3) is overlapped to vertical plastics clamp I (18) and vertical plastics clamp II (19), wherein vertical plastics clamp I (18) pass last vertical clamp fillet I (10) of plastics end plate I (2), last vertical clamp fillet I (10) of vertical clamp fillet I (13) and plastics end plate II (3) down, down with plastics end plate I (2) behind vertical clamp fillet I (13), battery module and plastics end plate II (3) vertical fixation, vertical plastics clamp II (19) pass last vertical fillet II (11) of plastics end plate I (2), And the plastic end plate I (2), the battery module and the plastic end plate II (3) are longitudinally fixed together after the lower vertical hoop fillet II (14) and the upper vertical hoop fillet II (11) of the plastic end plate II (3) and the lower vertical hoop fillet II (14).

5. The square lithium ion battery module combination structure of claim 4, wherein the clamp combination is configured as a transverse plastic clamp, and the transverse plastic clamp penetrates through a transverse clamp fillet I (16) and a transverse clamp fillet II (17) of the plastic end plate I (2) and a transverse clamp fillet I (16) and a transverse clamp fillet II (17) of the plastic end plate II (3) to transversely fix the plastic end plate I (2), the battery module and the plastic end plate II (3) together.

6. The square lithium ion battery module combined structure according to claim 1, characterized in that the inter-cell connecting device comprises an upper connecting device and a lower connecting device, the upper connecting device is installed on the upper part of the side surface of the battery module, the upper connecting device comprises a plurality of upper inter-cell connecting pieces (20), each inter-cell connecting piece (20) connects two adjacent cells (1) in series and then is fixed by an upper nut (21), the lower connecting device is installed on the lower part of the side surface of the battery module, the lower connecting device comprises a plurality of lower inter-cell connecting pieces (22), and each lower inter-cell connecting piece (22) connects two adjacent cells (1) in series and then is fixed by a lower nut (23).

7. The lithium ion battery pack assembly of claim 6, wherein the upper cell connectors (20) and the lower cell connectors (22) are staggered.

8. The combined structure of the square lithium ion battery module according to claim 6, wherein the upper nut (21) and the lower nut (23) are flange nuts.

9. The square lithium ion battery module combined structure of claim 1 or 2, wherein the surface of the plastic insulating sheet I (4), the surface of the plastic insulating sheet II (5) and the surface of the plastic insulating sheet III (6) are provided with non-drying glue layers, and the plastic insulating sheets I (4), the plastic insulating sheets II (5) and the plastic insulating sheets III (6) are made of PET materials.

10. The square lithium ion battery module combined structure of any one of claims 1 to 5, wherein the plastic end plate I (2) and the plastic end plate II (3) are made of ABS material.