CN112670637B

CN112670637B - Battery PACK

Info

Publication number: CN112670637B
Application number: CN202110070548.3A
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: 2023-06-02
Anticipated expiration: 2041-01-19
Also published as: CN112670637A

Abstract

The invention provides 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 body and comprises a shell and a plurality of battery cores 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 respectively arranged on the peripheral side walls of the shell, a fixing frame is arranged in the battery box body, a frame opening formed by the fixing frame is used for the battery module to penetrate through from top to bottom and put into the battery box body, and the connecting edges of the shell are located above the fixing frame and fixedly connected with the fixing frame through bolts. According to the invention, the front, back, left and right movement of the battery module can be limited through the fixing frame, and meanwhile, the connecting edge of the shell is positioned above the fixing frame and is fixedly connected with the fixing frame, so that the battery module is fixed, and the firm installation of the battery module is ensured.

Description

Battery PACK

Technical Field

The invention relates to the technical field of power batteries, in particular to a 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, an electric automobile power battery PACK (namely, a battery PACK) disclosed in Chinese patent application publication No. CN112117412A comprises a battery box body and a battery box cover plate, wherein a plurality of groups of battery modules, a battery management system and a high-voltage distribution box which are mutually independent and distributed at intervals are arranged in the battery box body, and each battery module and each high-voltage distribution box are connected through a high-voltage connection copper bar; the battery management system is connected with the battery module and the high-voltage distribution box through the low-voltage wire harness, and the battery management system and the high-voltage distribution box jointly form a battery control system.

The battery PACK is characterized in that the connecting support and the fixed cross beam are connected between each battery module, the structure is complex, the installation firmness of the battery modules cannot be guaranteed, particularly when the battery PACK is applied to a vehicle, jolts continuously in the running process of the vehicle, and more serious tests are provided for the fixation firmness of the battery modules.

Disclosure of Invention

The invention aims to provide a battery PACK capable of ensuring firm installation of a battery module.

In order to achieve the above purpose, the battery PACK in the present invention adopts the 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 body and comprises a shell and a plurality of battery cores 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 respectively arranged on the peripheral side walls of the shell, a fixing frame is arranged in the battery box body, a frame opening formed by the fixing frame is used for the battery module to penetrate through from top to bottom and put into the battery box body, and the connecting edges of the shell are located above the fixing frame and fixedly connected with the fixing frame through bolts.

The beneficial effects of the technical scheme are that: because the battery box body is internally provided with the fixing frame, the frame opening formed by the fixing frame is used for the battery module to pass through from top to bottom and put into the battery box body, the fixing frame can limit the front, back, left and right movement of the battery module, and meanwhile, the connecting edge of the shell is positioned above the fixing frame and is fixedly connected with the fixing frame through bolts, so that the battery module is fixed, and the firm installation of the battery module is ensured.

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

Further, in order to facilitate the fixed arrangement of the side longitudinal beams and the side transverse beams and optimize the structural layout, the four side walls of the battery box body are defined to be 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 transverse beams is fixed on the first side wall of the battery box body, a set interval space is reserved between the vertical surface where the other side transverse 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, in order to facilitate the fixed setting of battery control system, battery control system includes the mounting panel and fixes the BMS on the mounting panel, defines the side crossbeam of fixing on the first lateral wall of battery box and 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 has the fixed hem with second side crossbeam fixed connection.

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

Further, for convenient fixing, the connecting operation is simplified, the structure is simplified, the second side beam, the fixing folded edge and the connecting edge of the shell are fixedly connected through bolts, and the connecting edges of the second side beam, the fixing folded edge and the shell are provided with bolt mounting holes which correspond up and down.

Further, in order to conveniently control the temperature of the battery cell and facilitate the arrangement of the heating wires, and simultaneously facilitate the support of the battery module, the battery module comprises a heating film for heating the battery cell, and the heating film is connected with the heating wires; two parallel bulges are fixed on the bottom surface of the shell, a wiring groove for a heating wire to pass through is enclosed between the two bulges and the bottom surface of the shell, and a supporting beam for supporting the bottom surface of the shell in a contact way is fixed on the bottom wall of the battery box body.

Further, in order to simplify the structural arrangement, the support beams are arranged in parallel and comprise 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.

Further, in order to simplify the structure of the battery module while realizing that the battery cell is fixed in the shell, the shell is a square shell with an open top, the connecting edge is arranged at the top end of the peripheral side wall of the shell, and the battery module further comprises a pressing strip fixedly connected with the connecting edge so as to press and fix the battery cell in the shell.

Further, in order to facilitate the fixation, the connection operation is simplified, the structure is simplified, the pressing strip, the connection edge and the fixing frame are fixedly connected through bolts, and bolt mounting holes which correspond up and down are formed in the pressing strip, the connection edge and the fixing frame.

Drawings

Fig. 1 is an overall external view of a battery PACK according to the present invention;

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

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

fig. 4 is a perspective view of a battery PACK according to one aspect of the present invention;

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

fig. 6 is a top view of a battery PACK battery case according to the present invention;

fig. 7 is a perspective view of a battery module of the battery PACK according to the present invention at one view angle;

fig. 8 is a perspective view of another view 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 block diagram of a battery control system of a battery PACK in the present invention.

In the figure: 1-battery case cover; 2-a battery box; 201-a first sidewall; 202-a second sidewall; 203-a third sidewall; 204-a fourth sidewall; 205-bottom wall of the box body; 206-a first side rail; 207-a second side rail; 208-side stringers; 209—intermediate stringers; 210-a first support column; 211-second support posts; 212-an intermediate support beam; 213-two side support beams; 214-positive terminal box; 215-a negative terminal box; 216-communication interface; 217-pressure relief valve; 3, sealing strips; 4-a battery module; 41-a housing; 411-short side walls; 412-long sidewalls; 413-a housing bottom wall; 414-U-shaped plate; 415-wiring slots; 416-connecting edges; 417-perforating; 418-lightening holes; 42-cell; 43-layering; 44-a first heating film; 441-a first connection terminal; 442-a first heating wire; 45-a second heating film; 451-a second connection; 452-a second heating wire; 46-side insulating plates; 47-four parallel conducting bars; 48-four parallel four strings of conductive strips; 49-a tie; 5-battery control system; 51-mounting plate; 511-fixing the folded edges; 52-BMS; 53-insulating columns; 54-fuses; 55-charging and discharging relay; 56-a latching relay; 57-heating relay; 58-hall sensor; 6-acquisition lines; 71-an anode copper bar; 72-negative copper bars; 73-connecting copper bars.

Detailed Description

The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the particular embodiments described herein are illustrative only and are not intended to limit the invention, i.e., the embodiments described are merely some, but not all, of the embodiments of the invention. The components of the embodiments of the present invention 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 invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.

It is noted that relational terms such as "first" and "second", and the like, are 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. Moreover, 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 one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The features and capabilities of the present invention are described in further detail below in connection with the examples.

An embodiment of the battery PACK of the present invention, shown in fig. 1, comprises a battery case 2 and a battery case cover 1 fixedly connected to the battery case 2, and, as shown in fig. 3, a sealing strip 3 is interposed and fixed between the battery case 2 and the battery case cover 1 to ensure sealability. As shown in connection with 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 provided in the battery case 2 and connected with the battery modules 4.

The battery module has a structure as shown in fig. 7, 8 and 9, and includes a housing 41 and a plurality of battery cells 42 disposed in the housing 41, wherein the housing 41 is a rectangular housing having a peripheral sidewall and a housing bottom wall 413, the peripheral sidewall includes two long sidewalls 412 and two short sidewalls 411 that are oppositely disposed, the two short sidewalls 411 are respectively provided with a weight-reducing hole 418, and the weight-reducing hole 418 is a rectangular hole.

As shown in fig. 8 and 9, the battery cells 42 are provided with two rows, a first row of battery cells and a second row of battery cells, respectively, which are arranged side by side in the housing 41 along the length direction of the housing 41, each row including four battery cells 42 arranged along the width direction of the housing 41. The battery module further comprises two four-parallel conductive strips 47 and one four-parallel four-series conductive strip 48, wherein the four-parallel conductive strips 47 realize parallel connection of one row of four electric cores, and the four-parallel four-series conductive strips 48 simultaneously realize parallel connection of one row of four electric cores and serial connection of the four electric cores with the other row of four electric cores, namely, the first row of electric cores and the second row of electric cores are respectively connected in series and then are connected in parallel.

Because the top of casing 41 is open for the open top setting of electric core 42, the lateral wall top all around of casing 41 is provided with the connection limit 416 that outwards extends respectively, and battery module still includes with connection limit 416 fixed connection in order to compress tightly the layering 43 of fixing electric core 42 in casing 41, layering 43 is the plastic-impregnated layering that adopts the plastic-impregnated technology fashioned, and insulating properties and elasticity are all better. The number of the pressing bars 43 in one battery module is two, and the pressing bars are respectively pressed on the two rows of electric cores.

As shown in fig. 9, a heating film contacting with the battery cells 42 is disposed in the housing 41, and is used for heating the battery cells 42, specifically, the heating film includes a first heating film 44 and a second heating film 45 located at two ends in the longitudinal direction in the housing 41, the first heating film 44 contacts each side of the first row of battery cells, and the second heating film 45 contacts 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, a 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 between 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 a U-shaped plate 414, the opening of the U-shaped plate 414 faces the bottom surface of the housing 41 to be fixed, and a connecting flange (not labeled in the figure) which is turned outwards and is used for fixedly connecting with the bottom surface of the housing 41 is arranged on the U-shaped plate 414. The two U-shaped plates 414 and the bottom surface of the housing 41 together enclose a wiring groove 415, the wiring groove 415 is used for arranging the second heating wires 452, and in order to ensure that the heating wires are firm and reliable, a binding belt 49 for fixing the second heating wires 452 is arranged in the wiring groove 415.

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

The battery module is structurally characterized in that the battery module is assembled by directly placing the battery cell 42 in the shell 41 without using other squeezing tools and shaping equipment, so that the assembly is convenient, the assembly efficiency is improved, and the equipment cost is reduced. In addition, the connecting ends of the two heating films are arranged downwards, the bottom of the shell is provided with a perforation, and the bottom surface of the shell is provided with a wiring groove, so that the bottom wiring of the heating wire is realized, and the mess of wire harnesses at the top of the battery cell can be avoided, so that the electric power cable is attractive, and the layout design and fixation of other wire harnesses at the top of the battery cell are facilitated.

As shown in fig. 4, 5 and 6, the battery case 2 has four side walls, namely, 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, and a case bottom wall 205. A fixing frame is arranged in the battery box body 2, and comprises two parallel side cross beams and two parallel side longitudinal beams 208, wherein the side cross beams and the side longitudinal beams 208 are connected end to end. Two side stringers 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 beams is fixed on the first side wall 201 of the battery box to form a first side beam 206. The other side beam is close to the second side wall 202 of the battery box body, and is a second side beam 207, a set interval space is formed between the vertical surface of the second side beam and the second side wall 202 of the battery box body, and the battery control system 5 is arranged in the interval space.

The fixed frame still includes the intermediate longitudinal beam 209 of fixing between two side crossbeams for the fixed frame is the shape of a Chinese character 'ri' wholly, and has formed two frame mouths, and every frame mouth supplies battery module 4 to pass respectively top-down and put into battery box 2, and after the battery module 4 put into, the fixed frame can be spacing to the back-and-forth movement of battery module 4, and the connection limit 416 of battery module 4 is located fixed frame top and with fixed frame fixed connection, realizes the fixed to battery module 4, guarantees that battery module 4 installs firmly.

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

Wherein, each beam of the fixed frame is fixed with a nut, and the connection edge of the battery module 4 and the first side cross beam 206 are directly fixed by bolts, so as to realize the fixation between the housing 41 and the battery box 2. 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 battery module 4 and the pressing strip 43 are fixedly connected at the same time, namely, one connecting edge in the width direction, one end of the pressing strip 43 and the side longitudinal beam 208 are fixedly connected through bolts at the same time, and the other connecting edge in the width direction, the other end of the pressing strip 43 and the middle longitudinal beam 209 are fixedly connected through bolts at the same time, so that bolt mounting holes corresponding to each other are respectively formed in the battery module. Thus, 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 a mounting plate 51, the top of the mounting plate 51 has a fixing flange 511, the fixing flange 511 is fixedly connected with the second side rail 207, specifically, after the connecting edge of the battery module 4 is overlapped on the second side rail 207, the fixing flange 511 of the mounting plate 51 is overlapped on the connecting edge of the battery module 4, and the three are simultaneously fixedly connected through bolts, so that the connecting edges of the second side rail 207, the fixing flange 511 and the housing 41 are provided with bolt mounting holes corresponding up and down, the effects of which are as described above.

Since the fixing frame bears the weight of two battery modules, in order to secure the support of the fixing frame, as shown in fig. 4 and 5, a first support column 210 is fixed between the first side cross member 206 and the case bottom wall 205 of the battery case, while a second support column 211 is fixed between the second side cross member 207 and the case bottom wall 205 of the battery case, and since the second side cross member 207 is also fixed with the mounting plate 51 of the battery control system, the number of the second support columns 211 is greater than that of the first support columns 210. Specifically, the first support columns 210 are provided in two, and the second support columns 211 are provided in four.

In addition, since the bottom of the battery module 4 is provided with the protrusions, in order to conveniently support the battery module 4, the support beams for contact supporting the bottom surface of the case 41 are fixed on the case bottom wall 205 of the battery case, and as shown in fig. 4 and 5, the support beams are arranged in parallel in three 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 that of the two side support beams 213, and the middle support beam 212 simultaneously supports the two battery modules 4. As shown in fig. 7, there is a certain distance between the two U-shaped plates 414 at the bottom of the housing 41 and the bottom ends of the long side walls 412, which is just enough for the housing 41 to be placed on the middle support beam 212 and the both side support beams 213.

As shown in fig. 10, the battery control system 5 further includes a BMS52, two insulating columns 53, a charge and discharge relay 55, a latching relay 56, a heating relay 57, and a hall sensor 58, which are fixed on the mounting plate 51, wherein a fuse 54 is installed between the two insulating columns 53. As shown in fig. 1, a positive terminal box 214, a negative terminal box 215, a communication interface 216, and a pressure release valve 217 are mounted on the second side wall 202 of the battery case 2. As shown in fig. 2, one of the two battery modules 4 is connected with a positive copper bar 71, and the positive copper bar 71, the fuse 54, the charge-discharge relay 55 and the positive junction box 214 are sequentially connected, wherein the charge-discharge relay 55 is a charge-discharge integrated relay for controlling the charge and discharge of the battery module, and the charge-discharge relay 55 is connected with the BMS52 through an acquisition line. The other battery module of the two battery modules 4 is connected with a negative electrode copper bar 72, and the negative electrode copper bar 72 passes through the hall sensor 58 and then is connected with the negative electrode junction box 215, wherein the hall sensor 58 is used for collecting overcurrent, and the hall sensor 58 is connected with the BMS52 through a collecting wire.

As shown in fig. 2, the two battery modules 4 are connected in series by a connection copper bar 73, and the connection copper bar 73 is bridged between the four parallel conductive bars 47 of the two battery modules 4, so that in the whole, one battery module: the four battery cells are connected in parallel and then connected in series with the other four battery cells connected in parallel to form a battery module, and the two battery modules are connected in series to realize low-voltage, high-power and high-current output.

In addition, the heating wire arranged in the battery module consists of two wires, namely a positive wire and a negative wire, wherein 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 a collecting wire; the negative pole line passes hall sensor 58 for gathering the overcurrent, hall sensor 58 passes through collection line connection BMS in addition. The latching relay 56 is connected to an external control switch through the communication interface 216 for controlling temporary dormancy of the BMS. As shown in fig. 2, each of the four parallel conductive strips 47 and the four parallel four series conductive strips 48 is connected with a collection line 6, and the collection line 6 is connected with the BMS for collecting information such as terminal voltage of the current core.

In other embodiments of the battery PACK, the bead, the connecting edge and the fixing frame may not be connected at the same time, for example, the bead and the connecting edge may be connected separately, and the connecting edge and the fixing frame may be connected separately.

In other embodiments of the battery PACK, the top of the housing may not be open, e.g. the housing also comprises a cover through which the cells are compressed, without the bead structure.

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

In other embodiments of the battery PACK, the bottom wall of the battery box may not be provided with a support beam, but the battery module is directly supported by the bottom wall of the battery box, and at this time, when the bottom surface of the battery module is provided with a protrusion, the bottom wall of the battery box is directly supported by the protrusion, and when the protrusion is not provided, the bottom wall of the battery box is directly supported by the bottom surface of the battery module.

In other embodiments of the battery PACK, the second side rail, the fixing flange and the connecting edge of the housing may not be connected at the same time, for example, the second side rail is connected separately to the fixing flange, and the second side rail is also connected separately to the connecting edge.

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

In other embodiments of the battery PACK, the mounting plate of the battery control system may be fixed not to the second side rail but to the side wall or the bottom wall of the battery box, but rather the battery control system may not include the mounting plate, and the respective devices may be directly fixed in the battery box.

In other embodiments of the battery PACK, two side rails may be fixed to the first and second side walls of the battery case, respectively, with one of the two side rails being fixed to the side wall of the battery case and the other being spaced from the side wall of the battery case to arrange the battery control system; the battery box is characterized in that the two side cross beams are spaced from the side wall of the battery box, the two side longitudinal beams are spaced from the side wall of the battery box, or the two side cross beams, the two side longitudinal beams and the side wall of the battery box are spaced from each other.

In other embodiments of the battery PACK, the fixing frame may be shaped like a Chinese character 'mu', three battery modules may be arranged at this time, the fixing frame may be shaped like a Chinese character 'kou', only one battery module may be arranged at this time, the fixing frame may be shaped like a Chinese character 'tian', four battery modules may be arranged at this time, and in any case, the structure of the fixing frame may be designed in practical cases.

In other embodiments of the battery PACK, the connecting edges on the peripheral side walls of the battery module housing may not be at the top end of the housing, but may be in the middle of the housing, and the fixing frame is disposed in the battery case at a position corresponding to the lower position.

The above description is only a preferred embodiment of the present invention, and the patent protection scope of the present invention is defined by the claims, and all equivalent structural changes made by the specification and the 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 module is arranged in the battery box body and comprises a shell and a plurality of battery cells arranged in the shell, the shell is a rectangular shell and is provided with four side walls and a bottom wall, and the four side walls of the shell comprise two long side walls which are oppositely arranged and two short side walls which are oppositely arranged; 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 respectively arranged on the side walls of the periphery of the shell, a fixed frame is arranged in the battery box body, a frame opening formed by the fixed frame is used for a battery module to pass through from top to bottom and put into the battery box body, and the connecting edges of the shell are positioned above the fixed frame and fixedly connected with the fixed frame through bolts; 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 enclosed between the two bulges and the bottom surface of the shell, and a supporting beam for supporting the bottom surface of the shell in a contact way is fixed on the bottom wall of the battery box body; the battery cells are provided with two rows, namely a first row of battery cells and a second row of battery cells, the two rows of battery cells are arranged in the shell side by side along the length direction of the shell, the heating films comprise a first heating film and a second heating film which are positioned at two ends of the shell in the length direction, the first heating film is contacted with each side surface of the first row of battery cells, and the second heating film is contacted with each side surface of the second row of battery cells; the first heating film is provided with a first connecting end connected with the first heating wire, the second heating film is provided with a second connecting end connected with the second heating wire, the first connecting end and the second connecting end are both arranged downwards, the bottom of the shell is provided with a through hole for the first connecting end and the second connecting end to pass through respectively, and the wiring groove is used for arranging the second heating wire; the supporting beams are arranged in parallel and comprise a middle supporting beam and two side supporting beams, a space is reserved between the bulge and the bottom end of the long side wall, and the space just meets the requirement that the shell can be placed on the middle supporting beam and the two side supporting beams.

2. The battery PACK according to claim 1, wherein the fixing frame comprises two parallel side beams and two parallel side stringers, the side beams and the side stringers being connected end to end, the fixing frame further comprising an intermediate stringer fixed between the two side beams such that the fixing frame is generally in a "ri" shape and forms two of said frame openings, said battery modules being provided with two connecting edges adjacent to each other of the two battery modules being fixed to the intermediate stringer.

3. The battery PACK as claimed in claim 2, wherein the peripheral side walls defining the battery case 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, two side stringers are respectively fixed to the third side wall and the fourth side wall of the battery case, one of the two side beams is fixed to the first side wall of the battery case, a set space is provided between a vertical surface where the other side beam is located and the second side wall of the battery case, and the battery control system is provided in the space.

4. A battery PACK according to claim 3, wherein the battery control system comprises a mounting plate and a BMS mounted on the mounting plate, the side rails defined to be mounted on the first side wall of the battery compartment being a first side rail, the side rails adjacent to the second side wall of the battery compartment being a second side rail, the mounting plate having a stationary flange fixedly connected to the second side rail.

5. The battery PACK of claim 4, wherein a first support post is fixed between the first side rail and the bottom wall of the battery box, and a second support post is fixed between the second side rail and the bottom wall of the battery box, the number of second support posts being greater than the number of first support posts.

6. The PACK according to claim 4 or 5, wherein the second side rail, the fixing flange and the connecting side of the case are fixedly connected by bolts at the same time, and the second side rail, the fixing flange and the connecting side of the case are provided with bolt mounting holes corresponding up and down.

7. The battery PACK according to any one of claims 2 to 5, wherein the width of the middle support beam is larger than the width of the support beams on both sides, and the middle support beam supports both battery modules at the same time.

8. The battery PACK according to any one of claims 1 to 5, wherein the housing is a square housing with an open top, the connecting edge is disposed at the top end of the peripheral side wall of the housing, and the battery module further comprises a pressing strip fixedly connected with the connecting edge to press and fix the battery cell in the housing.

9. The battery PACK as claimed in claim 8, wherein the three members are fixedly connected by bolts, and the upper and lower corresponding bolt mounting holes are formed in the members.