CN214099753U

CN214099753U - Battery PACK

Info

Publication number: CN214099753U
Application number: CN202120139534.8U
Authority: CN
Inventors: 殷铁映; 贺毅; 王�义; 陈育伟; 胡松涛
Original assignee: Henan Liwei New Energy Technology Co ltd
Current assignee: Henan Liwei New Energy Technology Co ltd
Priority date: 2021-01-19
Filing date: 2021-01-19
Publication date: 2021-08-31
Anticipated expiration: 2031-01-19

Abstract

The utility model provides a battery PACK, include: a battery case; the battery box cover is fixedly connected with the battery box body; the battery module is arranged in the battery box and comprises a shell and a plurality of battery cells arranged in the shell; the battery control system is arranged in the battery box body and is connected with the battery module; the battery box is characterized in that connecting edges extending outwards are arranged on the peripheral side walls of the shell respectively, a fixed frame is arranged in the battery box, a frame opening formed by the fixed frame is used for the battery module to penetrate through from top to bottom and to be placed in the battery box, and the connecting edges of the shell are positioned above the fixed frame and are fixedly connected with the fixed frame. The utility model discloses a fixed frame can remove about to the battery module and carry on spacingly, the connection limit of casing simultaneously be located the fixed frame top and with fixed frame fixed connection to the realization is to the fixing of battery module, and it is firm to guarantee that the battery module installation.

Description

Battery PACK

Technical Field

The utility model relates to a power battery technical field, concretely relates to battery PACK.

Background

The battery PACK generally comprises a battery box body and a plurality of battery modules arranged in the battery box body, for example, a power battery PACK (namely, a battery PACK) of an electric vehicle disclosed in the chinese patent application with the application publication number CN112117412A, wherein the battery PACK comprises a battery box body and a battery box cover plate, a plurality of groups of battery modules, a battery management system and a high-voltage distribution box which are independently distributed at intervals are arranged in the battery box body, and the battery modules and the high-voltage distribution box are connected through high-voltage connecting copper bars; the battery management system is connected with the battery module and the high-voltage distribution box through the low-voltage wiring harness, and the battery management system and the high-voltage distribution box jointly form a battery control system.

Be connected with linking bridge and fixed cross beam between each battery module among the above-mentioned battery PACK, such structure is more complicated, can't guarantee the installation fastness of battery module moreover, especially when battery PACK uses on the vehicle, the vehicle goes the in-process and constantly has jolting, has provided more serious examination to the fixed firm nature of battery module.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a can guarantee the firm battery PACK of battery module installation.

In order to achieve the above object, the utility model provides a battery PACK adopts following technical scheme:

a battery PACK, comprising:

a battery case;

the battery box cover is fixedly connected with the battery box body;

the battery module is arranged in the battery box and comprises a shell and a plurality of battery cells arranged in the shell;

the battery control system is arranged in the battery box body and is connected with the battery module;

the battery box is characterized in that connecting edges extending outwards are arranged on the peripheral side walls of the shell respectively, a fixed frame is arranged in the battery box, a frame opening formed by the fixed frame is used for the battery module to penetrate through from top to bottom and to be placed in the battery box, and the connecting edges of the shell are positioned above the fixed frame and are fixedly connected with the fixed frame.

The beneficial effects of the above technical scheme are that: because the fixed frame is arranged in the battery box body, the frame opening formed by the fixed frame is used for the battery module to pass through from top to bottom and to be placed in the battery box body, the fixed frame can limit the battery module moving left and right and can limit the battery module moving front and back, and meanwhile, the connecting edge of the shell is positioned above the fixed frame and is fixedly connected with the fixed frame, so that the battery module is fixed, and the battery module is guaranteed to be firmly installed.

Further, in order to realize the setting of a plurality of battery modules, fixed frame includes the side crossbeam of two parallels and the side longeron of two parallels, and side crossbeam and side longeron end to end, fixed frame still including fixing the middle longeron between two side crossbeams to make fixed frame wholly be the day font and form two the frame mouth, the battery module is equipped with two, and two adjacent connection limits of battery module are all fixed on middle longeron.

Furthermore, in order to facilitate the fixed setting and the optimized structural layout of the side longitudinal beams and the side cross beams, the peripheral side walls of the battery box body are respectively a first side wall and a second side wall which are parallel to each other, a third side wall and a fourth side wall which are parallel to each other, the two side longitudinal beams are respectively fixed on the third side wall and the fourth side wall of the battery box body, one of the two side cross beams is fixed on the first side wall of the battery box body, a set interval space is formed between the vertical surface where the other side cross beam is located and the second side wall of the battery box body, and the battery control system is arranged in the interval space.

Further, for the fixed setting of convenient battery control system, battery control system includes the mounting panel and fixes the BMS on the mounting panel, and the side crossbeam that the definition was fixed on the first lateral wall of battery box is first side crossbeam, and the side crossbeam that is close to the second lateral wall of battery box is second side crossbeam, the mounting panel have with second side crossbeam fixed connection's fixed hem.

Furthermore, in order to ensure that the fixed frame is stably supported, a first support upright post is fixed between the first side cross beam and the bottom wall of the battery box body, a second support upright post is fixed between the second side cross beam and the bottom wall of the battery box body, and the number of the second support upright posts is larger than that of the first support upright posts.

Furthermore, in order to facilitate fixing, the connection operation is simplified, and the structure is simplified, the second side cross beam, the fixed folding edge and the connecting edge of the shell are fixedly connected through bolts, and bolt mounting holes corresponding to the second side cross beam, the fixed folding edge and the connecting edge of the shell are formed in the second side cross beam, the fixed folding edge and the connecting edge of the shell vertically.

Furthermore, the battery module is convenient to control the temperature of the battery core and arrange a heating wire and support, and comprises a heating film for heating the battery core, and the heating film is connected with the heating wire; two parallel bulges are fixed on the bottom surface of the shell, a wiring groove for a heating wire to pass through is defined between the two bulges and the bottom surface of the shell, and a supporting beam for carrying out contact support on the bottom surface of the shell is fixed on the bottom wall of the battery box body.

Further, for the setting of simplification structure, a supporting beam parallel arrangement is three, including middle supporting beam and both sides supporting beam, and the width of middle supporting beam is greater than the width of both sides supporting beam, and middle supporting beam supports two battery module simultaneously.

Further, in order to realize that electric core fixes in the casing, simplify the structure of battery module, the casing is the open square casing in top, connect the limit and set up in the top of the lateral wall all around of casing, the battery module still include with connect limit fixed connection in order to compress tightly the layering of fixing in the casing with electric core.

Furthermore, in order to facilitate fixing, connection operation is simplified, and the structure is simplified, the pressing strip, the connecting edge and the fixing frame are fixedly connected through bolts, and bolt mounting holes corresponding to each other up and down are formed in the pressing strip, the connecting edge and the fixing frame.

Drawings

FIG. 1 is an overall outline view of a battery PACK of the present invention;

FIG. 2 is a top view of the battery PACK of the present invention with the cover removed;

FIG. 3 is an exploded view of the battery PACK of the present invention after the cover of the battery case is removed;

fig. 4 is a perspective view of a viewing angle of a battery box of the battery PACK of the present invention;

fig. 5 is a perspective view of another view angle of the battery case of the battery PACK of the present invention;

fig. 6 is a top view of a battery box of the battery PACK of the present invention;

fig. 7 is a perspective view of a viewing angle of a battery module of the battery PACK of the present invention;

fig. 8 is a perspective view of another view angle of the battery module of the battery PACK according to the present invention;

fig. 9 is an exploded view of a battery module of the battery PACK of the present invention;

fig. 10 is a structural diagram of a battery control system of the middle battery PACK of the present invention.

In the figure: 1-battery box cover; 2-a battery case; 201-a first side wall; 202-a second sidewall; 203-a third side wall; 204-a fourth sidewall; 205-bottom wall of the box; 206-a first side beam; 207-a second side beam; 208-side stringers; 209-middle stringer; 210-a first support column; 211-a second support column; 212-intermediate support beam; 213-two side support beams; 214-positive terminal box; 215-negative terminal box; 216 — a communication interface; 217-a pressure relief valve; 3-sealing strips; 4-a battery module; 41-a housing; 411-short sidewalls; 412-long side walls; 413-housing bottom wall; 414-U-shaped plate; 415-a wiring trough; 416-a connecting edge; 417-perforation; 418-lightening holes; 42-electric core; 43-pressing strips; 44-a first heating film; 441-a first connection end; 442-a first heating wire; 45-a second heating film; 451-a second connection end; 452-a second heating wire; 46-side insulation plates; 47-four parallel conductive strips; 48-four parallel and four serial conductive strips; 49-a binding tape; 5-a battery control system; 51-a mounting plate; 511-fixing the folded edge; 52-BMS; 53-insulating columns; 54-a fuse; 55-charge and discharge relay; 56-latching relay; 57-heating relay; 58-hall sensor; 6-collecting line; 71-positive copper bar; 72-negative copper bar; 73-connecting copper bars.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention, i.e., the described embodiments are only some, but not all embodiments of the invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.

It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The features and properties of the present invention are described in further detail below with reference to examples.

The utility model discloses an embodiment of well battery PACK is shown in fig. 1, including battery box 2 and with battery box 2 fixed connection's battery case lid 1, as shown in fig. 3, for guaranteeing the leakproofness, press from both sides between battery box 2 and battery case lid 1 and establish and be fixed with sealing strip 3. As shown in fig. 2 and 3, the battery PACK further includes two battery modules 4 mounted in the battery case 2, and a battery control system 5 disposed in the battery case 2 and connected to the battery modules 4.

The structure of the battery module is as shown in fig. 7, 8 and 9, and includes a casing 41 and a plurality of battery cells 42 disposed in the casing 41, where the casing 41 is a rectangular casing having a peripheral side wall and a casing bottom wall 413, the peripheral side wall includes two oppositely disposed long side walls 412 and two oppositely disposed short side walls 411, the two short side walls 411 are respectively provided with lightening holes 418, and the lightening holes 418 are rectangular holes.

As shown in fig. 8 and 9, the battery cells 42 are provided with two columns, namely a first column and a second column, which are arranged side by side in the length direction of the casing 41 in the casing 41, and each column includes four battery cells 42 arranged in the width direction of the casing 41. The battery module further comprises two four parallel bus bars 47 and four parallel and four serial bus bars 48, wherein the four parallel bus bars 47 realize parallel connection of one row of four battery cells, the four parallel and four serial bus bars 48 simultaneously realize parallel connection of one row of four battery cells and serial connection of another row of four battery cells, namely, the first row of battery cells and the second row of battery cells are respectively connected in series and then connected in parallel.

Because the top of casing 41 is uncovered for the open setting in top of electric core 42, the lateral wall top all around of casing 41 is provided with outside extension's connection limit 416 respectively, and the battery module still includes and is connected limit 416 fixed connection in order to compress tightly the layering 43 of fixing in casing 41 with electric core 42, and layering 43 is for adopting the plastic-impregnated layering that soaks of plastic-process shaping, and insulating properties and elasticity are all relatively good. The number of the pressing strips 43 in one battery module is two, and the two pressing strips are respectively pressed on two rows of battery cores.

As shown in fig. 9, a heating film in contact with the battery cell 42 is disposed in the casing 41, and the heating film is used for heating the battery cell 42, specifically, the heating film includes a first heating film 44 and a second heating film 45 located at two ends of the casing 41 in the length direction, the first heating film 44 is in contact with each side of the first row of battery cells, and the second heating film 45 is in contact with each side of the second row of battery cells. Referring to fig. 7 to 9, the first heating film 44 has a first connection end 441 connected to the first heating wire 442, the second heating film 45 has a second connection end 451 connected to the second heating wire 452, the first connection end 441 and the second connection end 451 are both disposed downward, the bottom of the housing 41 is provided with a through hole 417 through which the first connection end 441 and the second connection end 451 respectively pass, and the through hole 417 is disposed at a junction of the short sidewall 411 and the housing bottom wall 413.

As shown in fig. 7, two parallel protrusions are fixed on the bottom surface of the housing 41, the protrusions are formed by U-shaped plates 414, the openings of the U-shaped plates 414 are fixed toward the bottom surface of the housing 41, and the U-shaped plates 414 are provided with connecting flanges (not labeled in the figure) which are turned outwards and are used for being fixedly connected with the bottom surface of the housing 41. The two U-shaped plates 414 and the bottom surface of the housing 41 together define a wiring slot 415, the wiring slot 415 is used for arranging a second heating wire 452, and in order to ensure that the heating wires are firm and reliable, a binding tape 49 for fixing the second heating wire 452 is arranged in the wiring slot 415.

In addition, in order to ensure the insulation performance, as shown in fig. 9, the battery module further includes side insulation plates 46 disposed inside the peripheral side walls of the case 41 and bottom insulation plates (not shown) disposed on the bottom wall 413 of the case, that is, four side insulation plates 46 and one bottom insulation plate may be made of a resin plate. In order to facilitate the arrangement of the heating films, the first heating film 44 and the second heating film 45 are respectively adhesively fixed to two side insulating plates 46 which are arranged to face each other.

Above be the structure of battery module, during the assembly battery module, directly place electric core 42 in casing 41 can, need not to use other crowded tight frock and plastic equipment, not only made things convenient for the assembly, improved assembly efficiency, reduced equipment cost moreover. In addition, the connecting ends of the two heating films are arranged downwards, the bottom of the shell is provided with a through hole, and the bottom surface of the shell is provided with a wiring groove, so that wiring at the bottom of the heating wire is realized, wiring harnesses at the top of the battery cell are prevented from being disordered, the appearance is attractive, and the layout design and the fixation of other wiring harnesses at the top of the battery cell are facilitated.

The battery case 2 has a structure as shown in fig. 4, 5 and 6, and the battery case 2 has a peripheral side wall and a case bottom wall 205, and the peripheral side wall includes a first side wall 201 and a second side wall 202 which are parallel to each other, and a third side wall 203 and a fourth side wall 204 which are parallel to each other. A fixed frame is arranged in the battery box body 2 and comprises two parallel side cross beams and two parallel side longitudinal beams 208, and the side cross beams and the side longitudinal beams 208 are connected end to end. Two side longitudinal beams 208 are respectively fixed on the third side wall 203 and the fourth side wall 204 of the battery box, and one of the two side cross beams is fixed on the first side wall 201 of the battery box to form a first side cross beam 206. Another side cross beam is close to the second side wall 202 of the battery box body, and is a second side cross beam 207, a set space is provided between the vertical surface where the side cross beam is located and the second side wall 202 of the battery box body, and the battery control system 5 is arranged in the space.

The fixed frame also comprises a middle longitudinal beam 209 fixed between the two side cross beams, so that the whole fixed frame is in a shape like a Chinese character 'ri', two frame openings are formed, each frame opening is respectively used for the battery module 4 to pass through and put into the battery box body 2 from top to bottom, after the battery module 4 is put into, the fixed frame can limit the movement of the battery module 4 all around, and the connecting edge 416 of the battery module 4 is positioned above the fixed frame and fixedly connected with the fixed frame, thereby realizing the fixation of the battery module 4 and ensuring the firm installation of the battery module 4.

Specifically, as shown in fig. 7 to 9 and fig. 4 to 6, two connecting edges in the length direction of the battery module 4 are respectively and fixedly connected to the first side cross beam 206 and the second side cross beam 207, two connecting edges in the width direction of the battery module 4 are respectively and fixedly connected to the side longitudinal beam 208 and the middle longitudinal beam 209, and the adjacent connecting edges of the two battery modules 4 are fixed to the middle longitudinal beam 209.

Nuts are fixed on each beam of the fixing frame, and the connecting edge of the battery module 4 and the first side beam 206 are directly fixed by bolts, so that the casing 41 and the battery box 2 are fixed. After the two connecting edges in the width direction of the battery module 4 are lapped on the side longitudinal beam 208 and the middle longitudinal beam 209, the connecting edges and the pressing strip 43 are simultaneously and fixedly connected, namely, one connecting edge in the width direction, one end of the pressing strip 43 and the side longitudinal beam 208 are simultaneously and fixedly connected through the bolt, and the other connecting edge in the width direction, the other end of the pressing strip 43 and the middle longitudinal beam 209 are also simultaneously and fixedly connected through the bolt, so that the bolt mounting holes which vertically correspond to each other are respectively arranged on the connecting edges and the middle longitudinal beam. Therefore, the arrangement of holes can be reduced, the structure is simplified, the processing is convenient, the connection operation is simplified, and the fixing of the shell 41 and the fixing of the battery cell 42 are realized.

As shown in fig. 10, the battery control system 5 includes the mounting plate 51, the top of the mounting plate 51 has a fixed folding edge 511, the fixed folding edge 511 is fixedly connected with the second side beam 207, specifically, after the connection edge of the battery module 4 is lapped on the second side beam 207, the fixed folding edge 511 of the mounting plate 51 is lapped on the connection edge of the battery module 4, and the three are simultaneously connected by bolts, so that the connection edges of the second side beam 207, the fixed folding edge 511 and the housing 41 are provided with bolt mounting holes corresponding to each other up and down, and the effect is as described above.

Since the fixing frame bears the weight of two battery modules, in order to ensure the fixing frame to be stably supported, as shown in fig. 4 and 5, a first support upright 210 is fixed between the first side cross beam 206 and the bottom wall 205 of the battery box, and a second support upright 211 is fixed between the second side cross beam 207 and the bottom wall 205 of the battery box, since the second side cross beam 207 is also fixed with the mounting plate 51 of the battery control system, the number of the second support upright 211 is greater than that of the first support upright 210. Specifically, there are two first support columns 210 and four second support columns 211.

In addition, since the bottom of the battery module 4 is provided with a protrusion, in order to support the battery module 4, three support beams for supporting the bottom surface of the housing 41 in contact are fixed on the bottom wall 205 of the battery case, as shown in fig. 4 and 5, the support beams are arranged in parallel and extend in the longitudinal direction, and include a middle support beam 212 and two side support beams 213, the width of the middle support beam 212 is greater than the width of the two side support beams 213, and the middle support beam 212 supports two battery modules 4 at the same time. As shown in connection with fig. 7, the two U-shaped plates 414 at the bottom of the housing 41 are spaced from the bottom ends of the long side walls 412 by a distance that is just sufficient for the housing 41 to rest on the middle support beam 212 and the two side support beams 213.

As shown in fig. 10, the battery control system 5 further includes a BMS52 fixed to the mounting plate 51, two insulating posts 53 between which the fuse 54 is mounted, a charge and discharge relay 55, a latching relay 56, a heating relay 57, and a hall sensor 58. As shown in fig. 1, the second side wall 202 of the battery case 2 is provided with a positive terminal box 214, a negative terminal box 215, a communication interface 216, and a relief valve 217. As shown in fig. 2, one of the two battery modules 4 is connected with a positive copper bar 71, the fuse 54, the charge and discharge relay 55 and the positive terminal box 214 are sequentially connected, wherein the charge and discharge relay 55 is a charge and discharge integrated relay for controlling the charge and discharge of the battery module, and the charge and discharge relay 55 is additionally connected with the BMS52 through a collection line. Be connected with negative pole copper bar 72 on the other battery module of two battery modules 4, negative pole copper bar 72 passes behind hall sensor 58 and is connected with negative pole terminal box 215, and wherein hall sensor 58 is used for gathering and overflows, and hall sensor 58 is connected with BMS52 through gathering the line in addition.

As shown in fig. 2, two battery modules 4 are connected in series through the connecting copper bar 73, and the connecting copper bar 73 is bridged between four conductive bars 47 of the two battery modules 4, so as to be integrated into one battery module: four electric cores are parallelly connected, establish ties with four electric cores that connect in parallel in addition again, constitute a battery module, establish ties again between two battery modules, realize low-voltage, high power, heavy current output.

In addition, the heating lead wire arranged in the battery module consists of two wires, namely a positive wire and a negative wire, the positive wire is connected with the heating relay 57 and used for controlling the on-off of heating, and the heating relay 57 is connected with the BMS through an acquisition wire; the negative line passes through the hall sensor 58 for collecting overcurrent, and the hall sensor 58 is additionally connected to the BMS through a collecting line. The latching relay 56 is connected to an external control switch through a communication interface 216 for controlling the temporary sleep of the BMS. In addition, as shown in fig. 2, each of the four parallel conductive strips 47 and the four parallel and four serial conductive strips 48 is connected to a collection line 6, and the collection line 6 is connected to the BMS and used for collecting information such as terminal voltage of the battery cell.

In other embodiments of the battery PACK, the pressing strip, the connecting edge and the fixing frame may not be connected simultaneously, for example, the pressing strip and the connecting edge may be connected separately, and the connecting edge and the fixing frame may also be connected separately.

In other embodiments of the battery PACK, the top of the casing may not be open, for example, the casing also includes a casing cover, and the battery cell is pressed by the casing cover, and there is no pressing bar structure.

In other embodiments of the battery PACK, four support beams may be provided, and two support one battery module in one group.

In other embodiments of battery PACK, can not set up a supporting beam on the diapire of battery box, but the diapire through the battery box directly supports the battery module, is provided with protruding when this moment on the bottom surface of battery module, and the diapire of battery box is direct to be supported with protruding contact, and when not setting up protruding, the diapire of battery box is direct to be supported with the bottom surface contact of battery module.

In other embodiments of the battery PACK, the second side beam, the fixed flange and the connecting edge of the housing may not be connected simultaneously, for example, the second side beam is connected with the fixed flange separately, and the second side beam is connected with the connecting edge separately.

In other embodiments of the battery PACK, the first support post and the second support post may not be provided.

In other embodiments of the battery PACK, the mounting plate of the battery control system may be fixed to the side wall or the bottom wall of the battery box instead of the second side beam, but the battery control system may not include the mounting plate, and the components are directly fixed in the battery box.

In other embodiments of the battery PACK, the two side cross beams may be fixed to the first side wall and the second side wall of the battery case, respectively, while one of the two side longitudinal beams is fixed to the side wall of the battery case and the other side longitudinal beam has a space from the side wall of the battery case to arrange the battery control system; or a space is arranged between the two side cross beams and the side wall of the battery box body, or a space is arranged between the two side longitudinal beams and the side wall of the battery box body, or a space is arranged between the two side cross beams, the two side longitudinal beams and the side wall of the battery box body.

In other embodiments of battery PACK, fixed frame also can be the mesh font, can set up three battery module this moment, and certainly fixed frame also can be the mouth font, and only one battery module this moment, fixed frame also can be the field font certainly, can set up four battery modules this moment, and fixed frame's structure can actual conditions design anyway.

In other embodiments of the battery PACK, the connecting edges on the peripheral side walls of the battery module casing may not be at the top end of the casing, but may also be at the middle part of the casing, and at this time, the fixing frame is also correspondingly arranged in the battery box to be lower.

The above description is only for the preferred embodiment of the present invention, and the present invention is not limited thereto, the protection scope of the present invention is defined by the claims, and all structural changes equivalent to the contents of the description and drawings of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery PACK, comprising:

a battery case;

the battery box cover is fixedly connected with the battery box body;

the battery box is characterized in that connecting edges extending outwards are arranged on the peripheral side walls of the shell respectively, a fixing frame is arranged in the battery box, a frame opening formed by the fixing frame is used for a battery module to penetrate through and be placed in the battery box from top to bottom, and the connecting edges of the shell are positioned above the fixing frame and are fixedly connected with the fixing frame.

2. The battery PACK according to claim 1, wherein the fixing frame comprises two parallel side beams and two parallel side longitudinal beams, the side beams and the side longitudinal beams are connected end to end, the fixing frame further comprises a middle longitudinal beam fixed between the two side beams, so that the fixing frame is integrally in a shape like a Chinese character 'ri' and forms two frame openings, the number of the battery modules is two, and the adjacent connecting edges of the two battery modules are fixed on the middle longitudinal beam.

3. The battery PACK according to claim 2, wherein the peripheral side walls defining the battery box body are a first side wall and a second side wall which are parallel to each other, a third side wall and a fourth side wall which are parallel to each other, the two side longitudinal beams are fixed to the third side wall and the fourth side wall of the battery box body, respectively, one of the two side cross beams is fixed to the first side wall of the battery box body, a set space is provided between a vertical surface where the other side cross beam is located and the second side wall of the battery box body, and the battery control system is disposed in the space.

4. The battery PACK of claim 3, wherein the battery control system comprises a mounting plate and a BMS fixed to the mounting plate, wherein the side beam fixed to the first side wall of the battery case is defined as a first side beam, and the side beam adjacent to the second side wall of the battery case is defined as a second side beam, and the mounting plate has a fixing flange fixedly connected to the second side beam.

5. The battery PACK of claim 4, wherein a first support column is fixed between the first side beam and the bottom wall of the battery case, and a second support column is fixed between the second side beam and the bottom wall of the battery case, the number of the second support columns being greater than the number of the first support columns.

6. The battery PACK according to claim 4 or 5, wherein the second side beam, the fixed flange and the connecting edge of the case are fixedly connected by bolts, and bolt mounting holes corresponding to each other are formed in the second side beam, the fixed flange and the connecting edge of the case.

7. The battery PACK of any one of claims 2 to 5, wherein the battery module comprises a heating film for heating the battery core, and a heating wire is connected to the heating film; two parallel bulges are fixed on the bottom surface of the shell, a wiring groove for a heating wire to pass through is defined between the two bulges and the bottom surface of the shell, and a supporting beam for carrying out contact support on the bottom surface of the shell is fixed on the bottom wall of the battery box body.

8. Battery PACK according to claim 7, characterized in that three support beams are arranged in parallel, comprising a middle support beam and two side support beams, the width of the middle support beam is larger than that of the two side support beams, and the middle support beam supports two battery modules simultaneously.

9. The battery PACK of any one of claims 1 to 5, wherein the casing is a square casing with an open top, the connecting edges are arranged at the top ends of the peripheral side walls of the casing, and the battery module further comprises a pressing strip fixedly connected with the connecting edges so as to press and fix the battery cell in the casing.

10. The battery PACK according to claim 9, wherein the pressing strip, the connecting edge and the fixing frame are fixedly connected by bolts at the same time, and bolt mounting holes corresponding to each other are formed in the pressing strip, the connecting edge and the fixing frame.