Lithium ion battery module

Abstract

The utility model belongs to the technical field of battery modules, and particularly discloses a lithium ion battery module, which comprises a shell and a battery cell group, the shell has a length direction, a width direction and a height direction, the battery cell group is placed in the shell along the width direction, the interior of the shell is encapsulated by glue, and the battery cell group is arranged in the shell by curing the glue; the battery cell group comprises a plurality of soft package battery cells, a plurality of foams and two protective plates, and the plurality of soft package battery cells and the plurality of foams are alternately stacked in the height direction. According to the utility model, the soft package battery cell and the foam are overlapped in sequence, and the top and the bottom are protected by the protective plates; after the battery cell group is placed in the shell, glue is poured into the shell; reinforcing ribs are arranged on the upper surface and the lower surface of the shell, so that the collision of the whole vehicle is resisted under the condition of enough strength; the expansion of the soft package battery is avoided, and the safety of the battery core is protected; and the driving safety performance of the electric automobile is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of battery module, specifically relates to a lithium ion battery module. BACKGROUND

[0002] Soft package battery, also called polymer lithium battery, is a kind of battery using aluminum-plastic composite film as shell and has the advantages of good safety performance, light weight, small internal resistance, good cycle performance and high energy density, so in the field of new energy vehicles, soft package battery is gradually favored by more automobile manufacturers and is used as starting power;

[0003] However, with the extension of service life, soft package battery will swell, which will cause the shell wrapping the soft package battery to swell, and the strength of the shell cannot withstand the safety of the battery in the case of extreme collision. UTILITY MODEL CONTENT

[0004] The utility model provides a kind of lithium ion battery module, to limit the swelling of soft package battery, and enough strength to resist the collision of whole vehicle.

[0005] The technical problem to be solved by the utility model is realized by the following technical scheme:

[0006] A kind of lithium ion battery module, including shell and battery core group, the shell has length direction, width direction and height direction, the battery core group is placed in the shell along the width direction, and the inside of the shell is filled by glue, and the battery core group is installed in the inside of the shell by glue solidification;

[0007] The battery core group includes a plurality of soft package batteries, a plurality of bubble cotton and two protective plates, a plurality of the soft package batteries and a plurality of bubble cotton are alternately stacked along the height direction, and two bubble cottons are located in the next bottom layer and the next top layer of the battery core group, wherein one protective plate is placed below the bubble cotton in the next bottom layer of the battery core group, and the other protective plate is placed above the bubble cotton in the next top layer of the battery core group.

[0008] Preferably, the upper surface and the lower surface of the shell are provided with reinforcing ribs.

[0009] Preferably, the reinforcing rib on the upper surface of the shell is a strip-shaped protruding structure, and the strip-shaped protruding structure extends along the width direction of the shell.

[0010] Preferably, the shell is provided with a cavity, the cavity extends along the width direction of the shell and corresponds to the battery core group, and the shell has an opening opening to the outside of the cavity, the battery core group enters the inside of the shell through the opening, and the shell is filled in the cavity by glue, and the battery core group is fixed in the cavity by glue solidification.

[0011] Preferably, the opening is provided on the outer end face in the length direction of the shell, the outer end face is provided with a fixed annular protrusion matched with the opening, a first fixing hole is provided on the fixed annular protrusion, the first fixing hole extends along the width direction of the shell, and the upper cover is fixed on the shell through the first fixing hole; the upper cover forms a mounting path through the cavity and the opening.

[0012] Preferably, the battery module further comprises a first PCBA board, a first positioning column and a fixed column are respectively arranged on the outer end face, the first positioning column and the fixed column are both located inside the fixed annular protrusion, and the first positioning column and the fixed column both extend along the width direction.

[0013] The first PCBA board is fixed on the outer end face along the mounting path, the first PCBA board is provided with a positioning hole matched with the first positioning column, a first through hole is provided on the first PCBA board, each soft package battery cell is provided with a tab, and the first through hole is matched with the tab.

[0014] The fixed column has a second fixing hole, a third fixing hole matched with the second fixing hole is provided on the first PCBA board, and the first PCBA board is fixed with the tab.

[0015] Preferably, the first PCBA board is provided with a welding row extending along the length direction, the first through hole also extends along the length direction, the welding row is located near the first through hole, the tab is fixed with the welding row through bending, so as to realize the series connection of the soft package battery cells and lead the total positive electrode and the total negative electrode of the battery cell group to the first PCBA board.

[0016] Preferably, the battery module further comprises a second PCBA board, the second PCBA board is fixed on the outer end face along the mounting path and located on one side of the first PCBA board, the second PCBA board is parallel to the first PCBA board, and the second PCBA board and the first PCBA board are fixed through a hexagonal copper stud.

[0017] The first PCBA board is further provided with an overcurrent copper stud, and the second PCBA board is fixed on the overcurrent copper stud through a screw, so that the first PCBA board and the second PCBA board are electrically connected.

[0018] Preferably, the second PCBA board is provided with a fourth fixing hole corresponding to the hexagonal copper stud, and the second PCBA board is provided with a current connection hole corresponding to the overcurrent copper stud.

[0019] Preferably, the battery module further comprises a breathable film, the breathable film is mounted on the upper cover, and is used for providing internal and external air pressure balance for the battery module.

[0020] Further, a countersunk hole is formed on the upper cover, and the air permeable film is attached to the countersunk hole.

[0021] Preferably, a mounting hole matched with the first fixing hole is formed on the upper cover, a screw is mounted in the mounting hole and the first fixing hole to fix the upper cover on the shell and seal the opening, and the second PCBA board and the first PCBA board are sealed in the cavity of the shell by the upper cover.

[0022] It should be noted that the mounting hole is a through hole, and the first fixing hole is a screw, which is screwed into the first fixing hole through the mounting hole to fix the upper cover on the shell.

[0023] Preferably, the upper cover is provided with a first annular sealing protrusion and a second annular sealing protrusion, the second PCBA board is provided with a communication socket, the upper cover is provided with a second through hole, the communication socket extends out of the upper cover through the second through hole, the second PCBA board is provided with a first annular sealing groove around the communication socket, the first annular sealing protrusion corresponds to the first annular sealing groove, the fixing annular protrusion forms a second annular sealing groove with the outer end face, and the second annular sealing protrusion corresponds to the second annular sealing groove.

[0024] By the above scheme, when the communication socket extends out of the upper cover through the second through hole, and the first annular sealing protrusion on the upper cover cooperates with the first annular sealing groove and the second annular sealing protrusion cooperates with the second annular sealing groove.

[0025] Specifically, the first annular sealing protrusion and the first annular sealing groove cooperate to form a first "U" type cavity, the second annular sealing protrusion and the second annular sealing groove cooperate to form a second "U" type cavity, and the first "U" type cavity and the second "U" type cavity are filled with sealing glue for sealing the entire battery pack.

[0026] Preferably, the materials of the shell and the upper cover are both die-cast aluminum materials.

[0027] The beneficial effects of the utility model are as follows:

[0028] (1) The utility model sequentially stacks the soft-pack battery core and the foam, and the top and bottom of the soft-pack battery core are protected by the protective plates; after the battery core group is placed in the shell, the shell is filled with glue, so that the battery core group is fixed in the shell after the glue solidifies; the stability of the battery core group installed in the shell is realized; the reinforcing ribs are arranged on the upper surface and the lower surface of the shell, and the reinforcing ribs can resist the collision of the whole vehicle under the condition of sufficient strength; the expansion of the soft-pack battery is avoided, the safety of the battery core is protected, and the driving safety performance of the electric vehicle is improved.

[0029] (2) The utility model discloses the first PCBA board on the first through -hole of bending through the pole lug on the soft package electric core, the circuit connection between the pole lug and the first PCBA board is convenient, in addition, the first PCBA board, second PCBA board and upper cover are all installed on the shell through screw locking piece etc., thereby the dismounting of first PCBA board, second PCBA board and upper cover on the shell is convenient.

[0030] (3) The utility model discloses the pole lug on the soft package electric core is connected with the welding row, realizes the series connection of soft package electric core, and the total positive pole and total negative pole of the electric core group are introduced to the first PCBA board, and then the overcurrent copper column on the first PCBA board is sleeved with the current connecting hole on the second PCBA board, and is locked and is electrically conducted with the filter copper column through the current connecting hole and the screw, to realize the electrical connection of first PCBA board and second PCBA board, and then the communication socket on the second PCBA board is stretched out of the upper cover, realizes the current connection and communication with the outside. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is the three-dimensional structure schematic diagram of the utility model;

[0032] Figure 2 It is the explosion drawing along the installation direction of the utility model;

[0033] Figure 3 It is the structure schematic diagram of the electric core group in the utility model;

[0034] Figure 4 It is the structure schematic diagram of the shell in the utility model;

[0035] Figure 5 It is the structure schematic diagram of the first PCBA board in the utility model;

[0036] Figure 6 It is the structure schematic diagram of the second PCBA board in the utility model;

[0037] Figure 7 It is the structure schematic diagram of hexagonal copper stud, stud and screw hole in the utility model;

[0038] Figure 8 It is the structure schematic diagram of the upper cover in the utility model;

[0039] Figure 9 It is the three-dimensional structure schematic diagram of the utility model after removing the upper cover and the second PCBA board;

[0040] Figure 10 It is the structure schematic diagram of the three-dimensional structure schematic diagram after removing the upper cover in the utility model;

[0041] Figure 11 It is the structure schematic diagram of two " U " type cavities in the utility model;

[0042] In the figure: the shell 10, the second positioning column 11, the fifth fixed hole 12, the first fixed hole 13, the second fixed hole 14, the first positioning column 15, the second annular sealing groove 16, the cavity 17, the reinforcing rib 18, the battery cell group 20, the soft package battery cell 21, the foam 22, the guard plate 23, the tab 24, the first PCBA board 30, the first through hole 31, the welding row 32, the third fixed hole 33, the positioning hole 34, the overflow copper column 35, the hexagonal copper stud 40, the stud 41, the screw hole 42, the second PCBA board 50, the fourth fixed hole 51, the current connection hole 52, the communication socket 53, the first annular sealing convex groove 54, the screw 60, the breathable film 70, the upper cover 80, the mounting hole 81, the second annular sealing convex 82, the first annular sealing convex 83, the countersunk hole 84. DETAILED DESCRIPTION

[0043] In order to make the technical means, creative characteristics, purposes and effects of the utility model easy to understand, the utility model is further described below in combination with specific drawings.

[0044] As shown in Figures 1-11 , a lithium ion battery module, comprising a shell 10 made of die-cast aluminum and a battery cell group 20 (it is necessary to point out that, see Figure 4 , the shell 10 is provided with a second positioning column 11 and a fifth fixed hole 12, a screw is passed through the fifth fixed hole 12 to fix it on the whole vehicle, and the second positioning column 11 is used to determine whether the shell 10 and the battery module are accurately positioned when installed on the whole vehicle, and according to actual needs, the number of second positioning columns 11 is two, and the number of fifth fixed holes 12 is four, and the four fifth fixed holes 12 are located at the four corners of the edge of the shell 10), the shell 10 has a length direction, a width direction and a height direction, the battery cell group 20 is placed in the shell 10 along the width direction, and the inside of the shell 10 is filled with glue, and the battery cell group 20 is fixed in the shell 10 by glue curing;

[0045] The battery cell group 20 comprises a plurality of soft package battery cells 21, a plurality of foams 22 and two guard plates 23, the plurality of soft package battery cells 21 and the plurality of foams 22 are alternately and height directionally stacked, and two foams 22 are respectively located at the next bottom layer and the next top layer of the battery cell group 20, one of the two guard plates 23 is placed below the foam 22 at the next bottom layer of the battery cell group 20, and the other guard plate 23 is placed above the foam 22 at the next top layer of the battery cell group 20;

[0046] The upper surface and the lower surface of the shell 10 are both provided with reinforcing ribs 18, the reinforcing rib 18 on the upper surface of the shell 10 is a strip-shaped convex structure, and the strip-shaped convex structure extends along the width direction of the shell, and the reinforcing rib 18 on the lower surface of the shell 10 is a hollow structure.

[0047] The shell 10 is provided with a cavity 17 extending along the width direction of the shell 10 and corresponding to the battery cell group 20, and the shell 10 has an opening opening the cavity 17 to the outside, through which the battery cell group 20 enters the inside of the shell 10, and the shell 10 is filled in the cavity 17 by glue, and the battery cell group 20 is fixed in the cavity 17 by glue curing.

[0048] The opening is arranged on the outer end face of the shell 10 in the length direction, and the outer end face is provided with a fixed annular protrusion matched with the opening, and the fixed annular protrusion is provided with a first fixing hole 13 (the number of the first fixing hole 13 is four according to actual needs, and the four first fixing holes 13 are respectively located at the four corner edges of the fixed annular protrusion), and the first fixing hole 13 extends along the width direction of the shell 10, and the upper cover 80 made of die-cast aluminum is fixed on the shell 10 through the first fixing hole 13; the upper cover 80 forms a mounting path through the cavity 17 and the opening.

[0049] The battery module further comprises a first PCBA board 30, and the outer end face is respectively provided with a first positioning column 15 (the number of the first positioning column 15 is two pairs according to actual needs, and one pair is located at the upper end of the opening, and the other pair is located at the lower end of the opening and corresponds to each other) and a fixed column (the fixed column is also provided with the first positioning column 15 according to actual needs, but in order to achieve better stability, the number of the fixed column is six), and the first positioning column 15 and the fixed column are located inside the fixed annular protrusion, and the first positioning column 15 and the fixed column extend along the width direction;

[0050] The first PCBA board 30 is fixed on the outer end face along the mounting path, and the first PCBA board 30 is provided with a positioning hole 34 matched with the first positioning column 15, and the first PCBA board 30 is provided with a first through hole 31 (the shape of the first through hole 31 in the embodiment is set as a long strip, and the number of the first through hole 31 is multiple), and each soft package battery cell 21 is provided with a tab 24, and the first through hole 31 is matched with the tab 24; each fixed column has a second fixing hole 14, and the first PCBA board 30 is provided with a third fixing hole 33 matched with the second fixing hole 14, and the first PCBA board 30 is fixed with the tab 24; Specifically, the tabs 24 of the plurality of soft package battery cells 21 pass through the plurality of long strip-shaped first through holes 31 of the first PCBA board 30, and the two positioning holes 34 of the first PCBA board 30 are matched with the two first positioning columns 15 of the shell 10; the threaded columns 41 of the plurality of hexagonal copper studs 40 pass through the plurality of third fixing holes 33 of the first PCBA board 30 and are locked on the plurality of second fixing holes 14 of the shell 10, and then the tabs 24 of the plurality of soft package battery cells 21 are bent and attached to the welding row 32 of the first PCBA board 30, see Figure 9 ;

[0051] The first PCBA board 30 is provided with a welding row 32 extending along the length direction, the first through hole 31 also extends along the length direction, and the welding row 32 is located near the first through hole 31, the tab 24 is fixed (mainly welded on the welding row 32 by a laser welding device) through bending and welding with the welding row 32, for realizing the series connection of the soft-pack battery cell 21, and leading the total positive electrode and the total negative electrode of the battery cell group 20 to the first PCBA board 30;

[0052] The battery module further comprises a second PCBA board 50, the second PCBA board 50 is fixed on the outer end face along the mounting path, and the second PCBA board 50 is parallel to the first PCBA board 30, and the second PCBA board 50 is fixed with the first PCBA board 30 through the hexagonal copper stud 40;

[0053] The first PCBA board 30 is further provided with an overcurrent copper stud 35, and the second PCBA board 50 is fixed on the overcurrent copper stud 35 through a screw 60, so that the first PCBA board 30 and the second PCBA board 50 are electrically connected, specifically, the second PCBA board 50 is provided with a fourth fixing hole 51 corresponding to the hexagonal copper stud 60 (according to actual needs, the hexagonal copper stud 60 and the fourth fixing hole 51 are both provided with multiple), and the second PCBA board 50 is provided with a current connection hole 52 corresponding to the overcurrent copper stud 35; more specifically, the hexagonal copper stud 40 extends along its own direction, and as shown in Figure 7 ;

[0054] One end of the hexagonal copper stud 40 is fixed with a stud 41 (according to actual use needs, the diameter of the hexagonal copper stud 40 is greater than the diameter of the stud 41), and the other end is provided with a threaded hole 42, the screw 60 is locked in the threaded hole 42 through the fourth fixing hole 51, and the screw 60 is locked on the overcurrent copper stud 35 through the current connection hole 52 (because the overcurrent copper stud 35 is provided with a threaded hole, the screw 60 can be locked on the overcurrent copper stud 35 through the threaded hole), as shown in Figure 10 , realizing the electrical connection between the first PCBA board 30 and the second PCBA board 50;

[0055] The battery module further comprises a breathable film 70, the breathable film 70 is installed on the upper cover 80, for providing internal and external air pressure balance for the battery module.

[0056] The upper cover 80 is provided with a countersunk hole 84, and the breathable film 70 is pasted on the countersunk hole 84.

[0057] The upper cover 80 is provided with a mounting hole 81 matched with the first fixing hole 13, and the first fixing hole 13 is a threaded hole, and the mounting hole 81 is a through hole, that is, the inner wall of the mounting hole 81 is not threaded, and the mounting hole 81 and the first fixing hole 13 are jointly provided with a screw 60, so as to fix the upper cover 80 on the shell 10 and seal the opening, and the second PCBA board 50 and the first PCBA board 30 are both sealed in the cavity of the shell 10 by the upper cover 80.

[0058] The upper cover 80 is provided with a first annular sealing protrusion 83 and a second annular sealing protrusion 82, the second PCBA board 50 is provided with a communication socket 53, the upper cover 80 is provided with a second through hole, the communication socket 53 extends out of the upper cover 80 through the second through hole, the second PCBA board 50 is provided with a first annular sealing groove 54 surrounding the communication socket 53, the first annular sealing protrusion 83 corresponds to the first annular sealing groove 54, the fixed annular protrusion and the outer end face form a second annular sealing groove 16, and the second annular sealing protrusion 82 corresponds to the second annular sealing groove 16.

[0059] By adopting the above scheme, when the communication socket 53 extends out of the upper cover 80 through the second through hole, and the first annular sealing protrusion 83 on the upper cover 80 cooperates with the first annular sealing groove 54, and the second annular sealing protrusion 82 cooperates with the second annular sealing groove 16.

[0060] Specifically, the first annular sealing protrusion 83 cooperates with the first annular sealing groove 54 to form a first "U"-shaped cavity, the second annular sealing protrusion 82 cooperates with the second annular sealing groove 16 to form a second "U"-shaped cavity, and the first "U"-shaped cavity and the second "U"-shaped cavity are filled with sealing glue for sealing the entire battery pack.

[0061] The basic principle and main features of the utility model and the advantages of the utility model are shown and described above. It should be understood by those skilled in the art that the utility model is not limited by the above-mentioned embodiments, and various changes and improvements can be made without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model claimed. The protection scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A lithium ion battery module comprising a housing and a cell pack, the housing having a length direction, a width direction and a height direction, characterized in that: The battery cell group is placed in the shell along the width direction and is filled in the shell by glue, and the battery cell group is fixed in the shell by glue solidification; The battery cell group comprises a plurality of soft package battery cells, a plurality of foam and two protective plates, the plurality of soft package battery cells and the plurality of foam are alternately stacked along the height direction, and two foams are respectively located at the bottom layer and the top layer of the battery cell group, one of the protective plates is placed below the foam at the bottom layer of the battery cell group, and the other protective plate is placed above the foam at the top layer of the battery cell group.

2. The lithium-ion battery module of claim 1, wherein: The shell is provided with a cavity extending along the width direction of the shell and corresponding to the battery cell group, and the shell has an opening opening to the outside of the cavity, through which the battery cell group enters the shell, and the shell is filled in the cavity by glue, and the battery cell group is fixed in the cavity by glue solidification.

3. The lithium-ion battery module of claim 2, wherein: The opening is arranged on the outer end surface of the shell in the length direction, the outer end surface is provided with a fixed annular protrusion matched with the opening, a first fixing hole is arranged on the fixed annular protrusion, the first fixing hole extends along the width direction of the shell, and the upper cover is fixed on the shell through the first fixing hole; the upper cover forms a mounting path through the cavity and the opening.

4. The lithium-ion battery module of claim 3, wherein: The battery module further comprises a first PCBA board, and a first positioning column and a fixing column are respectively arranged on the outer end surface, the first positioning column and the fixing column are located inside the fixed annular protrusion, and the first positioning column and the fixing column extend along the width direction; The first PCBA board is fixed on the outer end surface along the mounting path, the first PCBA board is provided with a positioning hole matched with the first positioning column, a first through hole is arranged on the first PCBA board, and each soft package battery cell is provided with a tab, and the first through hole is matched with the tab; The fixing column has a second fixing hole, the first PCBA board is provided with a third fixing hole matched with the second fixing hole, and the first PCBA board is fixed with the tab.

5. The lithium-ion battery module of claim 4, wherein: The first PCBA board is provided with a welding row extending along the length direction, the first through hole also extends along the length direction, the welding row is located near the first through hole, the tab is fixed with the welding row by bending, so as to realize the series connection of the soft package battery cell, and the total positive electrode and the total negative electrode of the battery cell group are introduced into the first PCBA board.

6. The lithium-ion battery module of claim 4, wherein: The battery module further comprises a second PCBA board, the second PCBA board is fixed on the outer end surface along the mounting path and located on one side of the first PCBA board, the second PCBA board is parallel to the first PCBA board, and the second PCBA board and the first PCBA board are fixed by a hexagonal copper stud; The first PCBA board is further provided with an overcurrent copper stud, and the second PCBA board is fixed on the overcurrent copper stud by a screw, so that the first PCBA board and the second PCBA board are electrically connected.

7. The lithium-ion battery module of claim 6, wherein: The upper cover is provided with a mounting hole matched with the first fixing hole, a screw is installed on the mounting hole and the first fixing hole to fix the upper cover on the shell and seal the opening, and the second PCBA board and the first PCBA board are sealed in the cavity of the shell by the upper cover.

8. The lithium-ion battery module of claim 6, wherein: The upper cover is provided with a first annular sealing protrusion and a second annular sealing protrusion, the second PCBA board is provided with a communication socket, the upper cover is provided with a second through hole, the communication socket extends out of the upper cover through the second through hole, the second PCBA board is provided with a first annular sealing groove around the communication socket, the first annular sealing protrusion corresponds to the first annular sealing groove, the fixing annular protrusion forms a second annular sealing groove with the outer end face, and the second annular sealing protrusion corresponds to the second annular sealing groove.

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