CN107887536B

CN107887536B - battery pack

Info

Publication number: CN107887536B
Application number: CN201610867114.5A
Authority: CN
Inventors: 李猛; 张海建; 曲凡多; 张放南; 张巧然; 曹雪平; 唐丽娟; 周月; 李卫华; 赵梁栋
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2016-09-30
Filing date: 2016-09-30
Publication date: 2021-08-20
Anticipated expiration: 2036-09-30
Also published as: CN107887536A

Abstract

The invention discloses a battery pack, comprising: a casing, the casing includes a lower casing and an upper casing; a battery module device, the battery module device is arranged in the casing, the battery module The device includes a plurality of layers of battery module assemblies, the plurality of battery module assemblies having battery modules stacked in multiple layers; a BDU, the BDU is disposed in the housing and located on the front side of the battery module device; MSD, the MSD is arranged in the casing, and the top of the MSD passes through the upper casing; a control board, the control board is arranged in the casing and connected to the battery module device. According to the present invention, the battery pack has high strength and stable structure, and can provide a safe and stable working environment for the battery module.

Description

Battery pack

Technical Field

The invention relates to the technical field of vehicles, in particular to a battery pack.

Background

In the aspect of the power battery pack structure, the stable and reliable shell structure is indispensable and needs to provide certain protection performances in the aspects of mechanical impact, vibration, extrusion collision, durability, dust and water prevention, corrosion resistance and the like. The structure failure can cause high-voltage electric shock danger and endanger the life safety of passengers. In the aspect of functions, the stability of electric energy output and storage and the monitoring of the battery state are very critical. The voltage, the pressure difference, the temperature difference and the like of the battery directly influence the functional safety of the battery pack.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the above-mentioned problems in the prior art. Therefore, an object of the present invention is to provide a battery pack, which has high strength and a stable structure and can provide a safe and stable working environment for a battery module.

The battery pack according to the present invention includes: a housing including a lower housing and an upper housing; a battery module device disposed within the housing, the battery module device including a plurality of layers of battery module assemblies having battery modules stacked in multiple layers; the BDU is arranged in the shell and positioned on the front side of the battery module device; MSD, the MSD is arranged in the shell, and the top of the MSD penetrates out of the upper shell; and the control panel is arranged in the shell and is connected with the battery module device.

The battery pack has high structural strength and higher protective performance, can provide a stable working environment for the battery module, and ensures that the battery module can safely and stably provide power.

Drawings

FIG. 1 is a schematic view of a vibration damping device according to an embodiment of the present invention;

FIG. 2 is an exploded view of a vibration damping device according to an embodiment of the present invention;

FIG. 3 is a partial cross-sectional view of a vibration damping device according to an embodiment of the present invention;

FIG. 4 is a cross-sectional view of a vibration damping device according to an embodiment of the present invention;

FIG. 5 is a schematic view of an upper housing according to an embodiment of the present invention;

FIG. 6 is an enlarged partial schematic view of circle A of FIG. 5;

FIG. 7 is a partial schematic view of an upper housing according to an embodiment of the invention;

FIG. 8 is a schematic view of an upper housing according to an embodiment of the present invention;

FIG. 9 is a schematic view of the mating of the lower housing with the lower plate according to an embodiment of the invention;

FIG. 10 is a schematic view of a lower plate according to an embodiment of the present invention;

FIG. 11 is a schematic view of a double deck modular bracket assembly according to an embodiment of the present invention in one orientation;

FIG. 12 is a schematic view of a double deck modular bracket assembly according to an embodiment of the present invention in another orientation;

fig. 13 is a schematic view of a battery module arrangement according to an embodiment of the present invention;

fig. 14 is a schematic diagram of a battery pack arrangement according to another embodiment of the invention;

fig. 15 is an exploded view of a battery module according to an embodiment of the present invention fitted to a lower case;

fig. 16 is a schematic view illustrating a battery module according to an embodiment of the present invention fitted to a lower case;

FIG. 17 is a schematic view of a lower housing according to an embodiment of the invention;

fig. 18 is an exploded view of a battery module according to an embodiment of the present invention;

FIG. 19 is a schematic view of a flexible strip arrangement according to one embodiment of the present invention;

FIG. 20 is a schematic view of a flexible strip arrangement according to another embodiment of the present invention;

FIG. 21 is a schematic view of a flexible strip arrangement according to yet another embodiment of the invention;

FIG. 22 is a schematic view of a retaining box according to an embodiment of the invention;

FIG. 23 is a schematic view of a wire containment box body according to an embodiment of the invention;

FIG. 24 is a schematic view of a grommet body according to an embodiment of the present invention;

FIG. 25 is a schematic view of a cassette lid according to an embodiment of the invention;

fig. 26 is a schematic view of a BDU housing according to an embodiment of the invention;

FIG. 27 is a schematic diagram of a plurality of electrical devices mated to a BDU backplane according to an embodiment of the invention;

fig. 28 is a schematic diagram of a battery pack according to an embodiment of the present invention.

Reference numerals:

the vibration damping device 100 is provided with a vibration damping device,

a vibration damping bracket 110, vibration damping bracket feet 111, a vibration damping bracket lower flange 112,

flexible bushing 120, flexible bushing lower flange 121, annular groove 101, flexible bushing lower groove 102,

the inner layer connecting sleeve 130, the annular rib 131,

the MSD assembly 200 is then assembled,

MSD holder 210, groove enclosure wall 211, MSD holder groove 201, MSD bottom relief hole 202,

the position of the MSD220, MSD flange 221,

MSD support plate 230, MSD top relief hole flanging 231, MSD top relief hole 203,

the first MSD bolt 240, the first MSD gasket 250, the second MSD bolt 260,

an upper case 300, an MSD access hole 301, an airtightness detection hole 302,

the central boss 310, rear boss 320, MSD access hole reinforcing protrusion 330,

the left front recess 341, the right front recess 342,

a front ridge 350, a waterproof vent valve 360,

the lower case 400 is provided with a lower case,

a lower supporting plate 500 is provided at the lower part of the body,

the lower tray frame 510 is provided with a lower tray,

a bottom plate beam 520, a first bottom plate beam 521, a second bottom plate beam 522, a third bottom plate beam 523,

the lower deck support beam 530 is supported by the lower deck,

a front lining reinforcing plate 541, a left front burring beam 541a, a right front burring beam 541b, a front bridging beam 541c, a left inner reinforcing plate 542,

a lower pallet beam lightening hole 501, a left turn-up support plate 543, a right internal reinforcement plate 544, a right turn-up support plate 545, a back lining reinforcement plate 546, a back turn-up support plate 547, a lower shell corner plate 548,

the double-layered module support assembly 600 is provided,

a lower module front bracket 610, a lower module front bracket body 611, a front bracket body lower folded edge 611a, a front bracket body upper folded edge 611b, a front fixing leg 612, a front fixing leg folded edge 612a,

a lower module left bracket 620, a lower module right bracket 630,

a middle clapboard 640, a middle clapboard body 641, a weight-reducing heat dissipation hole 601, a middle clapboard body folding edge 641a, a rear fixing supporting leg 642,

the battery module device 700 is provided with a battery module,

a front battery module assembly 710, a left front battery module 711, a right front battery module 712,

the middle battery module 720 is provided with a plurality of battery cells,

a multi-layered battery module assembly 730, an upper-layer battery module 731, a lower-layer battery module 732,

a first battery module 712a, a second battery module 712b, a third battery module 712c, a fourth battery module 732d, a fifth battery module 732e, a sixth battery module 732f, a seventh battery module 731g, an eighth battery module 731h, a ninth battery module 731i, a tenth battery module 731j, an eleventh battery module 731k, a twelfth battery module 732l, a thirteenth battery module 732m, a fourteenth battery module 721n, a fifteenth battery module 711o,

a sixteenth battery module 711p, a seventeenth battery module 711q,

a first detector plate 861, a second detector plate 862,

front battery module base plate 713, left front battery module base plate 713a, right front battery module base plate 713b, middle battery module base plate 722, sense plate base plate 740,

a front tubular reinforcement 751, a rear tubular reinforcement 752, a front tubular reinforcement fixing bracket 753, a rear tubular reinforcement fixing bracket 754,

the longitudinal connecting member 760 is provided with a longitudinal connecting member,

the rear reinforcing cross member 770 is formed of a rear reinforcing cross member,

a module bracket 781, an electric heating sheet 782, a battery body 783, a module flexible structure 784, a front end flexible strip 784a, a rear end flexible strip 784b, a left end flexible strip 784c, a right end flexible strip 784d,

a wire-protecting box 820 is provided,

a wire protection box body 821, a wire protection box reinforcing rib 821a, a wire harness avoiding groove 801, a wire protection box wire harness buckling hole 802, a wire protection box clamping hole 803, a wire protection box fixing hole 804,

a box cover 822, a box cover buckle 822a, a box cover limiting bulge 822b, a sub-box cover 822c, a box cover lightening hole 805,

BDU 810，

a BDU housing 811, a BDU base plate 811a, a BDU upper shell 811b, a BDU stiffener 811c,

the main positive relay 812, the positive clamp plate 812a,

a main negative relay 813, an auxiliary clamp plate 813a,

the number of precharge relays 814, precharge resistors 815,

the operation of thermal relay 816, heater plate 816a,

the fuse 817 is heated up and,

a flow splitter 818, a flow splitter shroud 818 a.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically connected, electrically connected or can communicate with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The battery pack is usually installed under the floor of the vehicle and is connected with the beam frame of the vehicle body in a hoisting mode. So the mounting means, the battery package need bear the vibration that the vehicle travel in-process produced to when the vehicle passes through abominable road conditions, the influence of vibration to the battery package will aggravate.

Therefore, how to ensure that the battery pack can bear continuous random vibration excitation in the long-term running process of the vehicle is an important research direction in the field of electric automobile safety, and a damping device is added between the vehicle and the battery pack to solve the problem.

The vibration damping device 100 for a vehicle according to an embodiment of the present invention will be described in detail below, and a battery pack may be hung on a chassis of the vehicle by the vibration damping device 100.

As shown in fig. 1 to 4, a vibration damping device 100 for a vehicle according to an embodiment of the present invention may include a vibration damping bracket 110, a flexible bushing 120, and an inner connection sleeve 130.

The shock mount 110 is adapted to be attached to the chassis of the vehicle, and optionally the shock mount 110 may be secured to the chassis of the vehicle by threaded fasteners.

The flexible bushing 120 is embedded in the vibration damping mount 110, and an annular groove 101 is formed on the inner circumferential surface of the flexible bushing 120; the inner connecting sleeve 130 is embedded in the flexible sleeve 120, an annular rib 131 is arranged on the outer peripheral surface of the inner connecting sleeve 130, the annular rib 131 is embedded in the annular groove 101, and the inner connecting sleeve 130 is suitable for being connected with a battery pack of a vehicle.

Since the inner connecting sleeve 130 mainly bears the axial tension generated by the gravity of the battery pack, the inner circumferential surface of the flexible bushing 120 is provided with the annular groove 101, and the outer circumferential surface of the inner connecting sleeve 130 is provided with the annular rib 131, so that the axial tension borne by the inner connecting sleeve 130 can be uniformly transmitted to the flexible bushing 120, and the unrecoverable damage caused by the stress concentration of the flexible bushing 120 can be avoided.

The flexible bushing 120 can also play a role in vibration reduction and energy absorption, ethylene propylene diene monomer or hydrogenated butadiene acrylonitrile rubber can be selected as a raw material, the maximum working temperature of the material can reach more than 100 ℃, and the material still has excellent mechanical properties at higher temperature.

The damping mount 110 and the inner connecting sleeve 130 are metal members, and the compliant sleeve 120 is integrally vulcanized with the damping mount 110 and the inner connecting sleeve 130. Optionally, the damping support 110 and the inner layer connecting sleeve 130 may be aluminum alloy members, so that on the premise of higher strength, the weight of the parts can be reduced, and the requirement of mass production can be met.

Optionally, a plurality of shock bracket legs 111 are disposed on the shock bracket 110, wherein an upper surface of the plurality of shock bracket legs 111 is higher than an upper surface of the shock bracket 110. Thereby, the vibration frequency transmitted from the chassis of the vehicle to the battery pack can be reduced.

In addition, the vibration reduction bracket 110 and the inner layer connecting sleeve 130 are made of metal parts, so that heat generated by the flexible bushing 120 in the working process can be smoothly transferred to the vibration reduction bracket 110 and the inner layer connecting sleeve 130 and can be quickly dissipated, and the phenomenon that the working stability of the flexible bushing 120 is influenced due to overhigh temperature of the flexible bushing 120 is avoided.

Specifically, the annular grooves 101 are formed in a plurality of rows and spaced apart from each other in the axial direction of the flexible bushing 120, and the annular ribs 131 are formed in a plurality of rows and are respectively fitted into the corresponding annular grooves 101. Thereby, the contact area of the inner connecting sleeve 130 and the flexible bush 120 can be further increased, and the force can be more uniformly transmitted between the inner connecting sleeve 130 and the flexible bush 120.

Further, a flexible bushing lower flange 121 is disposed on a lower end surface of the flexible bushing 120, and the flexible bushing lower flange 121 is attached to a lower end surface of the vibration damping mount 110. Preferably, the lower surface of the lower flange 121 of the flexible bushing is located below the lower surface of the inner connecting sleeve 130, and the height difference is 1mm-2 mm. The height difference includes 1mm and 2 mm.

Therefore, the flexible bushing 120 and the vibration damping support 110 can be combined more tightly, when the battery pack is mounted on the vibration damping device 100, the battery pack cannot be in direct contact with the vibration damping support 110, the battery pack can be pressed on the flexible bushing lower flange 121, the battery pack is guaranteed to be combined tightly with the vibration damping support 110, and the vibration damping support 110 cannot be impacted in the vibration process due to the fact that a gap exists between the vibration damping support 110 and the battery.

A damper bracket lower flange 112 is provided on a lower end surface of the damper bracket 110, and at least a portion of the damper bracket 110 is configured as a through-hole structure to receive the piston 120 and the inner layer connecting sleeve 130, and the damper bracket lower flange 112 is formed on a lower inner surface of the through-hole structure and extends inward.

The outer peripheral surface of the flexible bushing 120 is provided with a flexible bushing lower groove 102, and the vibration damping mount lower flange 112 is embedded in the flexible bushing lower groove 102. Thereby, the contact area of the flexible bushing 120 and the vibration damping mount 110 is further increased, so that the force can be more uniformly transmitted between the inner layer connection bushing 130 and the flexible bushing 120.

Further, flexible bushing lower groove 102 is immediately adjacent to flexible bushing lower flange 121. The flexible bushing 120 is more compact in overall structure, and the influence of the oversize of the vibration damping device 100 on the ground clearance of the battery pack is avoided.

The inside diameter of the damper bracket lower flange 112 is smaller than the outside diameter of the annular rib 131. And further, the connection stability of the vibration damping support 110 and the flexible bushing 120 is improved, and the flexible bushing 120 can be stably embedded in the vibration damping support 110, so that the annular convex rib 131 is prevented from being separated from the vibration damping support 110.

Alternatively, the vibration damping mount lower flange 112 may also be formed on the lower inner surface of the through hole structure and extend outward, the flexible bushing lower flange 121 is formed on the outer circumferential surface of the flexible bushing 120 and extends outward, and a groove is formed on the flexible bushing lower flange 121 to wrap the vibration damping mount lower flange 112.

During operation of the vibration damping device 100, the flexible liner 120 is subjected to high frequency vibrations for a long period of time, which may generate heat buildup and thus may cause a reduction in its mechanical properties.

To this end, in the damping device 100 according to the embodiment of the present invention, the damping mount 110 is provided with a damping mount heat dissipation structure for dissipating heat of the flexible bushing 120.

The vibration damping bracket heat dissipation structure may be a vibration damping bracket through-groove penetrating the outer circumferential wall of the vibration damping bracket 110 so that the flexible bushing 120 is exposed. Thus, during the running of the vehicle, the air flow can play a natural cooling role for the flexible bushing 120 and the vibration damping support 110.

Of course, the damper bracket heat dissipation structure may also be damper bracket heat dissipation fins (not shown) provided on the outer peripheral wall of the damper bracket 110. Thus, the contact area of the damper bracket 110 with air can be increased, so that the heat transferred to the damper bracket 110 by the flexible bushing 120 can be dissipated as quickly as possible.

In some embodiments of the present invention, the flexible bushing 120 may be a solid structure, but may also be a hollow structure, as long as sufficient damping performance of the flexible bushing 120 is ensured.

The vibration damping bracket 110 may be provided with a triangular reinforcing plate, whereby the strength of the vibration damping bracket 110 may be improved to ensure that the battery pack is securely mounted on the floor of the vehicle through the vibration damping device 100.

As shown in fig. 28, the battery pack according to the embodiment of the present invention includes a case, a battery module device 700, a BDU810(battery disconnection unit), an MSD220(manual service disconnection switch), a tubular reinforcement member, and a detection plate.

The case includes an upper case 300 and a lower case 400, and the upper case 300 and the lower case 400 define an installation space for housing the battery module device 700.

The battery module device 700 is disposed inside the case, and the battery module device 700 includes a plurality of battery module assemblies having a plurality of stacked battery modules.

The BDU810 is disposed in the case and located at the front side of the battery module device 700, the MSD220 is disposed in the case, and the top of the MSD220 penetrates through the upper case 300 to facilitate the operation of the service personnel.

The tubular reinforcement extends in the lateral direction of the battery pack, and is a hollow tubular beam-like structure, and is fixed in the lower case 400 by a tubular reinforcement fixing bracket. The detection board is disposed in the case and connected to the battery module device 700.

Due to the requirements on the driving range, the output power and the like of the whole vehicle, the power battery generally has the characteristics of large capacity, high voltage (200V-400V) and the like. For a high-voltage power battery, it is necessary to have a manual maintenance switch capable of manually disconnecting the circuit when necessary from a safety viewpoint. Under the conditions of power battery maintenance, vehicle high-voltage system maintenance, manual maintenance, power battery abnormity, low-voltage control abnormity and the like, the use and operation safety can be ensured by cutting off a manual maintenance switch. The switch needs to be arranged at a convenient operating position and needs to be ensured to be stable and reliable.

The manual maintenance switch support of current power battery package is located battery package middle part to link to each other through casing and lower casing on bolt and the power battery package, when the battery package was in whole car vibration state of traveling, the casing warp down and produce the effort through the spiro union position of manual maintenance switch support to last casing, under the long-term vibration or the violent impact condition, will make casing and manual maintenance switch spiro union position fracture, influence whole package waterproof, thereby influence whole package safety in utilization.

Secondly, the manual maintenance switch is fixed on the manual maintenance switch support through the bolt, and the manual maintenance switch is connected with the lower shell, and then when the shell is covered, the manual maintenance switch support is connected with the upper shell through the bolt. The manual service switch and the manual service switch bracket connecting bolt are externally visible and accessible after assembly is completed. During disassembly, there may be instances of erroneous disassembly of the connecting bolts. The manual maintenance switch and the manual maintenance switch bracket bolt are disassembled by mistake, and the high-voltage line can be pulled or even electrically shocked.

To this end, the present invention proposes an MSD assembly 200 for a battery pack, the MSD assembly 200 including an MSD supporter 210, an MSD220, and an MSD support plate 230.

Wherein, as shown in fig. 5 to 8, the MSD supporter 210 is adapted to be fixed to the lower case 400 of the battery pack, the MSD supporter 210 having the MSD supporter groove 201 provided thereon; the MSD220 is provided with an MSD flange 221, and the MSD flange 221 is accommodated in the MSD holder groove 201 and can be fixed in the MSD holder groove 201. Thus, the MSD220 may be securely supported on the MSD support 210. Optionally, the MSD flange 221 is rectangular and the shape of the MSD holder groove 201 matches the shape of the MSD flange 221.

MSD support plate 230 is located on the upper surface of upper case 300 of the battery pack, MSD support plate 230, upper case 300 and MSD supporter 210 are fixed, and MSD220 is exposed outward from upper case 300.

MSD220 is no longer directly fixed to upper case 300, but is fixed to upper case 300 of the battery pack through MSD support plate 230, thereby increasing the contact area between MSD220 and upper case 300, reducing the concentrated stress between MSD220 and upper case 300, and avoiding the phenomenon that upper case 300 cracks due to excessive concentrated stress between MSD220 and upper case 300.

It will be appreciated that a MSD access opening 301 is provided in the upper case 300 of the battery pack, and MSD220 may extend through MSD access opening 301.

MSD holder 210 is provided with a groove surrounding wall 211, MSD holder groove 201 can be surrounded by groove surrounding wall 211, and groove surrounding wall 211 abuts on the lower surface of upper case 300. Therefore, the installation of the MSD bracket 210 is more stable, and the damage of the MSD220 caused by the large shaking of the MSD bracket 210 when the vehicle runs is avoided.

Wherein, the groove surrounding wall 211 surrounds the MSD access opening 301, thereby making the structure of the MSD bracket 210 more compact and avoiding the MSD220 occupying too much space inside the case.

MSD assembly 200 also includes a first MSD bolt 240, first MSD bolt 240 securing MSD support plate 230, upper case 300 and groove enclosure wall 211. That is, MSD220 is fixed to MSD supporter 210, and MSD supporter 210 is fixed to upper case 300 by a screw fastener.

Preferably, a first MSD gasket 250 is disposed between the upper surface of the groove surrounding wall 211 and the lower surface of the upper case 300. The first MSD gasket 250 can ensure the waterproof performance of the battery pack and prevent external water or impurities from entering the inside of the case from the MSD access opening 301.

Of course, it will be appreciated that first MSD gasket 250 may also function as a shock absorber to absorb energy, avoiding severe impact of MSD mount 210 on upper case 300.

The top of the MSD220 passes through the MSD support plate 230, and then the MSD220 can be exposed from the battery pack, so that the MSD220 can be conveniently operated by the maintainer. MSD220 is disposed inside the case and passes through upper case 300 and MSD support plate 230 in order from the inside to the outside.

Specifically, the MSD support plate 230 is provided with an MSD top avoiding hole 203 for avoiding the top of the MSD, and the MSD top avoiding hole 203 is provided with an MSD top avoiding hole flanging 231.

The top avoidance hole flanging 231 can enable the periphery of the MSD top avoidance hole 203 to be smooth, so that operators are prevented from being cut, the strength of the MSD supporting plate 230 can be improved, and the MSD220 is guaranteed not to affect the overall installation strength of the battery pack.

The MSD assembly 200 further includes a plurality of second MSD bolts 260, each second MSD bolt 260 located at a corner of the MSD flange 221 to secure the MSD flange 221 to the MSD support groove 201, the second MSD bolts 260 located radially outward of the MSD top relief hole bead 231 such that the MSD top relief hole bead 231 obstructs the second MSD bolts 260.

Therefore, the phenomenon that a maintenance worker removes the second MSD bolt 260 due to misoperation to cause the pulling of a high-voltage line and even the electric shock is avoided.

The lower surface of the MSD flange 221 is provided with a second MSD gasket interposed between the lower surface of the MSD flange 221 and the upper surface of the MSD holder groove 201. Thus, the firmness of the mounting of the MSD220 to the MSD mount 210 is improved, and the second MSD gasket functions to at least some extent to absorb vibration and energy.

In some embodiments of the present invention, MSD bottom avoidance holes 202 are disposed on the MSD support groove 201, and the MSD bottom avoidance holes 202 are used for avoiding the bottom of the MSD 220. In other words, the bottom of the MSD220 may extend into the MSD bottom clearance hole 202,

the installation process of the components of MSD220 is briefly described below.

MSD220 is first fixed to MSD supporter 210 by second MSD bolt 260, MSD supporter 210 is then fixed to lower case 400, after the test of battery module assembly 700 is completed, upper case 300 and lower case 400 are then fixed together, and finally upper case 300, MSD support plate 230 and MSD supporter 210 are fixed together by first MSD bolt 240.

As shown in fig. 7 to 8, the battery pack is adapted to be fixed to a lower surface of a floor panel of a vehicle, the floor panel is provided with a floor access opening, the floor access opening is detachably provided with a floor access opening cover, the upper case 300 is provided with an MSD access opening 301, the MSD access opening 301 is obliquely arranged so that a top portion of the MSD220 of the vehicle is obliquely exposed from the MSD access opening 301, and the MSD access opening 301 is opposite to the floor access opening.

In other words, MSD220 may pass through MSD access 301 on upper case 300 and a floor access on the floor, and since MSD access 301 is disposed at an inclination, MSD220 may protrude from MSD access 301 at an inclination, and thus a driver may conveniently operate MSD220 from a rear seat.

In addition, the spatial layout of the MSD220 arranged obliquely is more reasonable and compact, the space is saved, and meanwhile, the interference of the MSD220 and other parts is effectively avoided.

The upper case 300 is formed with a central swelling portion 310, the central swelling portion 310 being located at a middle position of the upper case 300 in the lateral direction of the battery pack, the central swelling portion 310 extending in the longitudinal direction of the battery pack, and the MSD service port 301 being provided at the rear end of the central swelling portion 310.

Further, MSD service port 301 is of a sunken inclined structure with respect to central raised portion 310, and a rear side edge of MSD service port 301 is higher than a front side edge of MSD service port 301, i.e., MSD service port 301 is disposed toward the front. Thus, a service person can conveniently place a hand at MSD service port 301 to operate MSD 220.

Preferably, the MSD access opening 301 is angled from 5 to 45 from the horizontal. It should be noted that the angle between the MSD access opening 301 and the horizontal plane includes 5 ° and 45 °.

In some embodiments of the present invention, the upper case 300 is further formed with a rear ridge 320, the rear end of the central ridge 310 is connected to the rear ridge 320, and the MSD access port 301 is adjacent to the rear ridge 320. Since the rear seats do not need to move forward and backward and up and down, and thus an adjusting device is not required at the lower sides of the rear seats, the rear seats occupy less space, and the rear protrusions 320 formed on the upper case 300 can make full use of the space saved by the rear seats.

The central raised portion 310 corresponds to a floor raised portion of the vehicle, and the MSD service opening 301 corresponds to a position between front and rear seats of the vehicle. Thus, the passenger of the rear seat can open the floor access panel by reaching out, and then expose and operate the MSD 220.

Further, the distance between the highest point of the MSD220 and the position of the floor service hole is 2cm-10 cm. Note that, the range of the distance between the highest point of the MSD220 and the floor service port includes 2cm and 10 cm.

Therefore, the operation is not easy because the distance between the human hand and the MSD220 is too far after the human hand extends into the floor access hole, and the service life of the MSD220 is not influenced because the MSD220 is too close to the floor access hole and interferes with a floor access hole cover plate when a vehicle vibrates.

Preferably, MSD access hole reinforcing protrusions 330 are provided around the MSD access hole 301. Therefore, the strength around the MSD access hole 301 is obviously improved, and the probability of damage of the MSD access hole 301 is reduced.

The MSD access port 301 is equidistant from the left and right edges of the central boss 310, and the rear side edge of the MSD access port 301 is spaced from the rear side edge of the central boss 310. Thus, the MSD220 can be further facilitated for the service personnel to operate.

For guaranteeing that the internal pressure of the power battery pack keeps balance under different temperatures and different altitude conditions, the internal pressure of the power battery pack is guaranteed to be always in a balance state under different use conditions by setting the waterproof vent valve 360 and balancing the internal pressure change of the power battery pack caused under different temperatures and different altitude conditions.

To the power battery of high voltage, the leakproofness of power battery package directly influences electric automobile's safety in utilization, considers from safe angle to need to set up the gas tightness inspection hole and is convenient for detect the gas tightness of power battery package, and the casing combines whole car rational layout simultaneously, improves the utilization ratio in space to set up waterproof breather valve 360, make power battery package internal pressure be in balanced state all the time, thereby guarantee electric automobile safety in utilization.

The air tightness detection hole of the existing power battery pack is connected with the mounting hole of the waterproof vent valve by the aid of the mounting hole of the waterproof vent valve, a test connecting pipe of the detection equipment is connected with the mounting hole of the waterproof vent valve for testing during air tightness testing, and the waterproof vent valve is mounted after the air tightness testing is finished. The sealing performance of the waterproof vent valve cannot be detected, so that the waterproof performance of the battery pack can be influenced, and the use safety of the electric automobile is influenced.

For this, as shown in fig. 8, the present invention provides an upper case 300 for a battery pack, wherein a plurality of waterproof vent valves 360 are disposed on the upper case 300, the plurality of waterproof vent valves 360 are disposed on one side of the upper case 300, an air tightness detection hole 302 is further disposed on the upper case 300, and a sealing device is detachably disposed at the air tightness detection hole 302.

In other words, the upper casing 300 of the present invention is provided with an air-tightness detecting hole 302 for detecting the air-tightness of the casing, and the air-tightness detecting hole 302 is different from the hole in which the waterproof vent valve 360 is located.

When detecting the gas tightness of the casing, can directly connect detection device at gas tightness inspection hole 302 to can detect waterproof ventilative valve 360's sealing performance. After the detection is completed, the sealing device can be sealed in the air tightness detection hole 302.

In some embodiments of the present invention, the plurality of waterproof breather valves 360 are distributed in multiple rows and columns. Specifically, the plurality of waterproof vent valves 360 is four and distributed on four vertices of a rectangle.

The rear of the upper case 300 is provided with a rear swelling portion 320, and a plurality of waterproof and airing valves 360 are provided on the side of the rear swelling portion 320.

The sealing means includes an airtight bolt, the lower end of which downwardly passes through the airtightness detection hole 302, and an airtight nut, which is located inside the lower case 400 and is screw-fastened to the airtight bolt.

A first airtight rubber ring is arranged between the airtight bolt and the airtight detection hole 302, and a second airtight rubber ring is arranged between the airtight nut and the airtight detection hole 302. Thus, the sealing means can seal the airtightness detection hole 302 better, and the airtightness of the case of the battery pack can be improved.

The airtight nut can be vulcanized and fixed with the first airtight rubber ring, and the airtight nut can be directly fixed inside the air tightness detection hole 302.

In some embodiments of the present invention, the left front of the upper housing 300 is recessed downward to form a left front recess 341 and the right front of the upper housing 300 is recessed downward to form a right front recess 342. The left front recess 341 and the right front recess 342 can significantly improve the utilization of space in combination with the rational layout of the entire vehicle.

The upper case 300 is formed with a front protrusion 350, a central protrusion 310 and a rear protrusion 320, the central protrusion 310 is located at the middle of the upper case 300 in the lateral direction of the battery pack, the central protrusion 310 extends in the longitudinal direction of the battery pack, the front protrusions 350 are located at the left and right sides of the central protrusion 310, respectively, and the front protrusions 350 are also located at the rear sides of a left front recess 341 and a right front recess 342, the rear end of the central protrusion 310 is connected to the rear protrusion 320, a middle recess is formed between the front protrusion 350 and the rear protrusion 320, and the middle recesses are located at the left and right sides of the central protrusion 310, respectively.

Note that MSD access hole 301 is located on central boss 310, and both sides of MSD access hole 301 are depressed in the middle.

The front raised portion 350 corresponds to a front seat of the vehicle, the rear raised portion 320 corresponds to a rear seat of the vehicle, the central raised portion 310 corresponds to a floor raised portion of the vehicle, and the central depression corresponds to a position between the front seat and the rear seat of the vehicle.

By arranging the front raised part 350, the rear raised part 320 and the central raised part 310, the space in the housing of the battery pack can be maximized according to the structure of the whole vehicle, and more battery modules can be placed in the housing.

With the increasing severity of energy situations, power modules and power systems used in the fields of electric vehicles and the like are continuously developed and improved, and in consideration of reliability and safety of battery packs, one of the safety requirements and test method test projects of the battery pack system of the electric vehicle at present is a random vibration test, which puts high requirements on the strength of the battery pack, otherwise, when the battery pack vibrates in an Z, Y, X axial direction on a vibration table, the battery pack is damaged seriously, and even under a real working condition, the damage is brought to safe driving. And because the requirement of the installation of battery package module itself, the casing also has very high intensity under the battery package, can bear the energy harm that is brought by vibration, collision, avoids battery package overall structure to take place the phenomenon of inefficacy. This also puts higher demands on the strength of the lower case in the entire battery pack.

The structure cross-section of casing often is more single under current battery package, and though this kind of structure manufacturability is good, but battery package bulk strength is not enough, and casing erection point department and module mounting hole stress concentration easily lead to the casing fracture under in experiments such as vibration, impact to cause whole battery package to become invalid.

To this end, the present invention proposes a lower case assembly for a battery pack, which includes a lower case 400 and a lower plate 500.

Specifically, as shown in fig. 9 to 10, the lower plate 500 is fixed to the lower surface of the bottom wall of the lower case 400, and the lower plate 500 may improve the strength of the lower case 400, ensuring that the battery pack can be stably mounted on the lower case 400.

The bottom plate 500 includes a bottom plate frame 510, a plurality of bottom plate cross members 520, and bottom plate support beams 530.

Two ends of the lower supporting plate beam 520 are respectively fixed with the left and right longitudinal frame strips of the lower supporting plate frame 510. A plurality of lower tray beams 520 are spaced apart along the longitudinal direction of the battery pack. Thus, the strength of the lower tray 500 can be improved, the overall strength of the lower case assembly is also improved, and it is ensured that the battery assembly can be stably fixed to the lower case 400.

The two ends of the bottom plate support beam 530 are fixed to the left and right longitudinal frame strips of the bottom plate frame 510, respectively, and the bottom plate support beam 530 is disposed adjacent to the middle bottom plate cross beam 520. Alternatively, the lower deck support beams 530 may be secured to a center one of the lower deck beams 520.

The plurality of bottom plate beams 520 include a first bottom plate beam 521, a second bottom plate beam 522 and a third bottom plate beam 523 which are distributed from front to back at intervals, and the distance between the first bottom plate beam 521 and the second bottom plate beam 522 is smaller than the distance between the second bottom plate beam 522 and the third bottom plate beam 523.

In some embodiments of the present invention, the distance between first and second bottom plate beams 521, 522 is 455mm-495mm, and the distance between second and third bottom plate beams 522, 523 is 515mm-555 mm. It should be noted that the above numerical ranges are inclusive of the endpoints.

The distance between the first bottom plate beam 521 and the front frame strip of the bottom plate frame 510 is greater than the distance between the third bottom plate beam 523 and the rear frame strip of the bottom plate frame 510.

In some embodiments of the present invention, the lower plate beam 520 is provided with a lower plate beam lightening hole 501. From this, can reduce bottom plate crossbeam 520's weight under the prerequisite of guaranteeing that bottom plate crossbeam 520 has sufficient intensity, and then reduced the energy consumption of vehicle to a certain extent at least, improved the continuation of the journey of vehicle.

A lower casing peripheral wall reinforcing means which is annular and provided around the outer peripheral wall of the lower casing 400 is provided on the outer peripheral wall of the lower casing 400. Thereby, the strength of the lower case 400 is further improved.

The lower case peripheral wall reinforcing means includes a front lining reinforcing plate 541, the front lining reinforcing plate 541 is fixed to the front wall surface of the outer peripheral wall of the lower case 400, the front lining reinforcing plate 541 is provided with a left front burring beam 541a and a right front burring beam 541b, and the front lining reinforcing plate 541 is further provided with a front burring beam 541 c.

The lower casing peripheral wall reinforcing means further includes a left inner reinforcing plate 542 and a left flange supporting plate 543, the left inner reinforcing plate 542 being fixed to the left wall surface of the peripheral wall of the lower casing 400, and the left flange supporting plate 543 being fixed to the outside of the left inner reinforcing plate 542.

The lower casing peripheral wall reinforcing means further includes a right inner reinforcing plate 544 and a right burring support plate 545, the right inner reinforcing plate 544 being fixed to the right wall surface of the peripheral wall of the lower casing 400, and the right burring support plate 545 being fixed to the outside of the right inner reinforcing plate 544.

The lower-casing peripheral-wall reinforcing device further includes a back-lining reinforcing plate 546 and a back-burring supporting plate 547, the back-lining reinforcing plate 546 being fixed to the back wall surface of the peripheral wall of the lower casing 400, the back-burring supporting plate 547 being fixed to the rear side of the back-lining reinforcing plate 546.

The front liner reinforcing plate 541, the left inner reinforcing plate 542, the right inner reinforcing plate 544 and the rear liner reinforcing plate 546 are all fixed on the peripheral wall of the lower case 400, and energy-absorbing cavities are formed between the front liner reinforcing plate 541, the left inner reinforcing plate 542, the right inner reinforcing plate 544 and the rear liner reinforcing plate 546 and the peripheral wall of the lower case 400 respectively, so that the strength of the lower case assembly can be improved, impact energy can be absorbed when the lower case assembly collides, and damage to the battery in the lower case assembly is reduced.

In some embodiments of the present invention, the lower casing peripheral wall reinforcing apparatus further comprises lower casing gussets 548, the lower casing gussets 548 are respectively disposed at four corners of the lower casing 400, and the lower casing gussets 548 on the left front side are respectively connected to the left end of the front liner reinforcing plate 541 and the front end of the left turn-up supporting plate 543, the lower casing gussets 548 on the right front side are respectively connected to the right end of the front liner reinforcing plate 541 and the front end of the right turn-up supporting plate 545, the lower casing gussets 548 on the left rear side are respectively connected to the left end of the rear turn-up supporting plate 547 and the rear end of the left turn-up supporting plate 543, and the lower casing gussets 548 on the right rear side are respectively connected to the right end of the rear turn-up supporting plate 547 and the rear end of the right turn-up supporting plate 545, wherein the lower casing gussets 548 are arc-shaped gussets.

The lower housing gusset 548 may connect together the front liner reinforcement panel 541, the left turn-up support panel 543, the right turn-up support panel 545 and the rear turn-up support panel 547. And then, further improved the intensity of casing subassembly down, guaranteed that battery pack is stably firmly installed on casing subassembly down.

According to the lower shell assembly provided by the embodiment of the invention, all parts are welded together, so that the strength of the lower shell assembly can be improved, and the battery assembly can be stably installed on the lower shell assembly.

Present battery module arranges the form and mostly is the tiling, is fixed in casing down through construction bolt with single-deck battery module inside, and the size of the battery module of tiling form mainly receives the size restriction of vehicle X and Y direction, so the quantity that battery module arranged also can receive the size restriction of vehicle X and Y direction, can't utilize the space of Z direction, and the space is arranged in utilization that can not maximize. In addition, if the long-driving-range upgrading is carried out on the basis of the flat-paved battery module, the realization difficulty is greatly improved. If a double-layer arrangement mode is adopted, the Z-direction space is reasonably utilized, and the energy upgrading of the product is facilitated.

To this end, the present invention provides a double-layered module bracket assembly 600 for a battery pack, the battery module including a lower module front bracket 610, a lower module left bracket 620, a lower module right bracket 630, and a middle spacer 640.

As shown in fig. 11-12, the lower module front bracket 610 is adapted to be fixed to a lower case of the battery pack, the lower module left bracket 620 and the lower module right bracket 630 are adapted to be fixed to the lower case, the lower die holder left bracket is located on the left side of the lower module front bracket 610, and the lower die holder right bracket is located on the right side of the lower module front bracket 610.

The lower module left bracket 620 and the lower module right bracket 630 may be fixed to the lower module front bracket 610, respectively, or may be fixed to the lower housing.

The middle barrier 640 includes a middle barrier body 641 and rear fixing legs 642, the rear fixing legs 642 are adapted to be fixed to the lower case 400, the lower module front bracket 610, the lower module left bracket 620, the lower module right bracket 630 and the middle barrier 640 together define a lower battery mounting space for mounting the lower battery module, and the middle barrier body 641 is used for mounting the upper battery module 731.

The double-layered module bracket assembly 600 for a battery pack according to an embodiment of the present invention may support and mount two layers of battery modules, one layer of battery modules may be mounted on the lower case 400 of the battery case, and the other layer of battery modules may be mounted on the middle spacer 640.

Therefore, the space utilization rate of the battery pack can be remarkably improved, and more battery modules can be contained in the same battery pack shell. The double-deck module bracket assembly 600 according to an embodiment of the present invention may be disposed under the lower floor of the rear seat, and since the rear seat occupies a small space in the height direction, the case of the battery pack may be constructed in a form that is low in the front and high in the rear, and the double-deck module bracket assembly 600 according to an embodiment of the present invention may be disposed in a higher portion of the case of the battery pack.

The lower module front bracket 610 includes a lower module front bracket body 611 and a front fixing leg 612, and the lower module front bracket body 611 is fixed to the lower case 400 by the front fixing leg 612. Alternatively, the front fixing legs 612 may be fixed to the lower case 400 by a screw fastener.

Specifically, the front fixing legs are U-shaped with a downward opening, lower opening ends of the U-shaped front fixing legs 612 are respectively provided with front fixing leg hems 612a, and the front fixing leg hems 612a fix the lower module front bracket body 611 on the lower housing 400. Alternatively, the front fixing leg flaps 612a may be fixed to the lower case 400 by a threaded fastener.

Further, a lower side edge of the lower module front bracket body 611 is provided with a front bracket body lower folded edge 611a extending forward, and the front fixing leg folded edge 612a, the front bracket body lower folded edge 611a and the lower housing 400 are fastened by a first double-layer module bolt.

The front fixed leg flap 612a and the front bracket body lower flap 611a are spaced apart in the up-down direction, and the front bracket body lower flap 611a may be on the same plane as the top wall of the "U" -shaped front fixed leg.

The front edge of the middle partition body 641 is provided with a middle partition body folding edge 641a, and the middle partition body folding edge 641a is fixed with the top wall of the U-shaped front fixing support leg 612. Alternatively, the intermediate bulkhead body fold 641a can be secured to the top wall of the front securing leg 612 with a threaded fastener.

The upper edge of the lower module front bracket body 611 is provided with a front bracket body upper hem 611b extending forward, a middle partition body hem 641a, the front bracket body upper hem 611b, the top wall of the front fixing leg 612 of the "U" shape is fastened by a second double-layer module bolt, and the middle partition body hem 641a is supported on the front bracket body upper hem 611 b.

In some embodiments of the present invention, the front end of the lower module left bracket 620 abuts the left end of the lower module front bracket 610, the front end of the lower module right bracket 630 abuts the right end of the lower module front bracket 610, the lower module left bracket 620 and the lower die holder right bracket also support the left side edge and the right side edge of the middle barrier body 641, respectively, and the lower module left bracket 620 and the lower die holder right bracket 630 are also fixed with the left side edge and the right side edge of the middle barrier body 641, respectively.

The lower-layer module right bracket 630, the lower-side module left bracket 620, the lower-layer module front bracket 610 and the middle partition plate body 641 define a lower-layer battery module installation space, and a layer of battery module can be installed in the lower-layer battery module installation space; meanwhile, another layer of battery modules may be mounted above the middle barrier body 641.

The intermediate partition body 641 is provided with a plurality of weight-reducing heat dissipation holes 601, and the peripheries of the weight-reducing heat dissipation holes 601 are provided with weight-reducing heat dissipation hole flanges. Therefore, heat generated by the battery module can be dissipated rapidly through the weight-reducing heat dissipation holes 601, the working temperature of the battery module is prevented from being too high, meanwhile, the weight of the middle partition plate 640 can be reduced under the condition that the strength of the middle partition plate 640 is guaranteed, and the energy consumption of a vehicle is reduced at least to a certain extent.

In addition, the periphery of the weight-reducing heat dissipation holes 601 is provided with weight-reducing heat dissipation hole flanges, so that the strength of the weight-reducing heat dissipation holes 601 can be improved, and the fault probability of the weight-reducing heat dissipation holes 601 is reduced.

The weight-reducing heat dissipation holes 601 are rectangular and provided with flanges, each weight-reducing heat dissipation hole 601 corresponds to one rectangular boss, each boss corresponds to one battery module, and the bosses are arranged in parallel and the like.

In some embodiments of the present invention, the width between the two sidewalls of the "U" shaped front securing leg 612 increases in the direction from the top to the bottom.

The middle barrier body 641 is turnably connected to the rear fixing leg 642, so that the middle barrier 640 can be easily opened to inspect the lower battery module when the lower battery module fails. Alternatively, the middle barrier body 641 may be hinged to the rear fixing leg 642.

With the current social energy crisis becoming more serious, new energy automobiles are getting more and more social attention, especially electric automobiles. In order to accelerate the development schedule of the new energy automobile, the traditional automobile enterprises generally make appropriate changes on the traditional automobile model, and new energy driving parts are added to realize the development of the new energy power automobile.

The power battery pack serves as an oil tank of a new energy electric drive part and has the functions of storing and outputting electric energy. The power battery pack is mainly formed by connecting hundreds or even thousands of battery monomers in series and parallel, if one battery cell is assembled, the production efficiency is influenced, so that the battery cells are generally assembled into a module in a certain quantity and a certain mode, namely a battery module, so that the power battery pack is used for assembling the whole power battery pack.

A traditional vehicle type is changed into a pure electric vehicle, and a battery is generally arranged below a bottom plate of a passenger compartment of the vehicle. Since the vehicle body structure is not generally adjusted to a large extent, the battery needs to be arranged in cooperation with the vehicle body structure. This results in a limited space available for the battery pack, and the arrangement of the battery modules inside the power battery pack directly affects the space utilization of the entire battery pack.

The arrangement of the battery modules in the power battery pack directly influences the space utilization rate of the power battery pack. If the battery modules are unreasonably arranged, the electric quantity required by the whole vehicle cannot be met in the limited space, and the performance of the whole vehicle is low. Meanwhile, the arrangement of the battery modules in the battery pack directly affects the arrangement of the wire harnesses and the cables in the battery pack, and the unreasonable arrangement causes the disorder of the wire harnesses and the cables and affects the reliability of the whole battery pack. The arrangement of the modules also directly affects the assembly efficiency and the center of gravity position of the whole package. The mass distribution of the whole vehicle is directly influenced because the power battery pack of the pure electric vehicle is generally heavier.

To this end, the present invention provides a battery module apparatus 700 for a battery pack, the battery module apparatus 700 being divided into a front battery module assembly 710, a middle battery module 720, and a multi-layered battery module assembly 730.

Here, as shown in fig. 13 to 16, the front battery module assembly 710 is divided into a left front battery module 711 and a right front battery module 712, the left front battery module 711 and the right front battery module 712 being opposite in the lateral direction of the battery pack, and the left front battery module 711 being spaced apart from the right front battery module 712.

The middle battery module 720 is disposed at the rear row of the front battery module assembly 710, the multi-layered battery module assembly 730 is disposed at the rear of the middle battery module 720, and the multi-layered battery module assembly 730 has a plurality of stacked battery modules.

The rear seat of vehicle need not do too much adjustment, therefore the height of rear seat is lower, and then the height of the position that corresponds rear seat on the battery package is higher, and the rear portion of battery package is uplifted in order to form back uplift portion 320 promptly, can place multilayer battery module subassembly in the back uplift portion 320.

The battery module device 700 of the embodiment of the invention can fully utilize the internal space of the shell of the battery pack, improve the space utilization rate, and utilize the gaps among the battery modules to dissipate heat during working.

The multi-layered battery module assembly 730 includes upper and lower

stacked battery modules

731 and 732, the upper battery module 731 may be disposed on the middle spacer body 641, and the lower battery module 732 may be fixed on the lower case 400 and located in the lower module right bracket 630, the lower module left bracket 620, the lower module front bracket 610, and the middle spacer body 641 to define a lower battery module installation space.

Further, the upper battery module 731 and the lower battery module 732 are aligned up and down, and each of the upper battery module 731 and the lower battery module 732 is symmetrical with respect to the longitudinal center line of the battery pack. Therefore, the control of the mass distribution of the whole vehicle is utilized, and the running stability of the whole vehicle is improved.

The middle battery module 720 is located in the middle of the battery pack in the transverse direction of the battery pack, so that the symmetry of the battery pack is further improved, and the average distribution of the overall quality of the battery pack is ensured.

The left front battery module 711 and the right front battery module 712 are symmetrical with respect to the longitudinal center line of the battery pack, thereby preventing the left and right mass of the battery pack from being inconsistent and causing a skew phenomenon.

The length direction of each battery module in the front battery module assembly 710 is parallel to the lateral direction of the battery pack, the length direction of the middle battery module 720 is parallel to the longitudinal direction of the battery pack, and the length direction of each battery module in the multi-pack module assembly is parallel to the longitudinal direction of the battery pack.

In other words, each of the front battery module assemblies 710 extends in the left-right direction of the vehicle, the middle battery module 720 extends in the front-rear direction of the vehicle, and each of the multi-layered battery module assemblies 730 extends in the front-rear direction of the vehicle.

The right front battery module 712 includes a first battery module 712a, a second battery module 712b, and a third battery module 712c juxtaposed from front to rear, and the left front battery module 711 includes a seventeenth battery module 711q, a sixteenth battery module 711p, and a fifteenth battery module 711o juxtaposed from front to rear.

The middle battery module 720 is a fourteenth battery module 721n, and the lower battery module 732 includes a twelfth battery module 732l, a thirteenth battery module 732m, a fourth battery module 732d, a fifth battery module 732e, and a sixth battery module 732f, which are juxtaposed from left to right.

The upper battery module 731 includes an eleventh battery module 731k, a tenth battery module 731j, a ninth battery module 731i, an eighth battery module 731h, and a seventh battery module 731g, which are juxtaposed from left to right. Among them, the first battery module 712a and the seventeenth battery module 711q are sequentially connected in series. The first battery module 712a has a positive terminal, and the seventeenth battery module 711q has a negative terminal.

Further, the first to ninth battery modules 712a to 731i have a first sensing board 861 for battery module parameter measurement, and the tenth to seventeenth battery modules 731j to 711q have a second sensing board 862 for battery module parameter measurement.

In some embodiments of the present invention, the right front battery module 712 includes a first battery module 712a, a second battery module 712b, and a third battery module 712c juxtaposed from front to rear, and the left front battery module 711 includes a seventeenth battery module 711q, a sixteenth battery module 711p, and a fifteenth battery module 711o juxtaposed from front to rear.

The middle battery module 720 is a fourth battery module 732d, and the lower battery module 732 includes a thirteenth battery module 732m, a fourteenth battery module 721n, a fifth battery module 732e, a sixth battery module 732f, and a seventh battery module 732g juxtaposed from left to right.

The upper battery module 731 includes a twelfth battery module 731l, an eleventh battery module 731k, a tenth battery module 731j, a ninth battery module 731i, and an eighth battery module 731h that are juxtaposed from left to right, wherein the first to seventeenth battery modules 712a to 711q are connected in series.

The first to third battery modules 712a to 712c and the fifth to tenth battery modules 732e to 731j perform battery module parameter measurement by the first detection plate 861, and the remaining battery modules perform battery module parameter measurement by the second detection plate 862.

The gap between the left front battery module 711 and the right front battery module 712 is 60mm to 80mm, the distance between the front end of the middle battery module 720 and the rear end of the front battery module assembly 710 is 40mm to 60mm, and the distance between the rear end of the middle battery module 720 and the front end of the double-layer battery module assembly is 220mm to 240 mm.

The distance between the upper battery module 731 and the lower battery module 732 is 10mm to 15mm, and the gap between two adjacent battery modules of the upper battery module 731 or the lower battery module 732 is 1mm to 5 mm. Therefore, the heat dissipation of the battery module is facilitated, and the battery module is ensured to be at a proper working temperature. It should be noted that the above numerical ranges are inclusive of the endpoints.

Each battery module comprises a plurality of single battery cores, the battery modules of the embodiment of the invention are divided into two types, namely a large module formed by two parallel-six strings of twelve single battery cores and a small module formed by two parallel-five strings of ten single battery cores, the single rated voltage of each single battery core is 3.65V, the nominal capacity is 40Ah, the single rated voltage of each large module is 21.9V, the nominal capacity is 80Ah, the single rated voltage of each small module is 18.25V, and the nominal capacity is 80 Ah.

In some embodiments of the present invention, each of the battery modules in the front battery module assembly 710 is a large module, and each of the middle battery module 720 and the multi-layered battery module assembly 730 is a small module.

The multi-layered battery module assembly 730 according to the embodiment of the present invention corresponds to the rear protrusions 320 and the rear seats, and the rear seats occupy a small height space, so that the rear portion of the battery pack case may be provided as the rear protrusions 320, and the multi-layered battery module assembly 730 may be provided in the rear protrusions 320.

The power battery system is used as a main energy storage device of the new energy automobile and is a key component of the new energy automobile, the structural strength of the battery pack determines the safety performance of the battery system and even influences the safe driving of the whole automobile, the strength of an internal support directly influences the overall structural strength of the battery pack, and on the premise of considering cost, process and structural strength, the fixing support meeting the requirements is designed, so that the structural strength requirement of the battery pack can be met, and resources such as cost and the like can be saved.

The battery lower case assembly according to an embodiment of the present invention may include a lower case 400, a front battery module base plate 713, a middle battery module base plate 722, and a detection plate base plate 740.

As shown in fig. 17, the front battery module bottom plate 713 is fixed on the upper surface of the bottom wall of the lower case 400, and the front battery module bottom plate 713 is used to mount the front battery module assembly 710.

A middle battery module bottom plate 722 is fixed on the upper surface of the bottom wall of the lower case 400, and the middle battery module bottom plate 722 is used to mount the middle battery module 720.

Detector plate base plate 740 is secured to the upper surface of the bottom wall of lower housing 400, and detector plate base plate 740 is used to mount a detector plate (including first detector plate 861 and second detector plate 862).

According to the battery pack lower case assembly of the embodiment of the present invention, the front battery module assembly 710, the middle battery module 720, and the sensing board are more stably mounted by providing the front battery module base plate 713, the middle battery module base plate 722, and the sensing board base plate 740 on the lower case 400.

In some embodiments of the present invention, the battery pack lower case assembly may further include a front tubular reinforcement 751 and a rear tubular reinforcement 752, the front tubular reinforcement 751 being disposed in parallel with the rear tubular reinforcement 752 and spaced apart in a longitudinal direction of the battery pack, each of the front tubular reinforcement 751 and the rear tubular reinforcement 752 being fixed within the lower case 400 by a tubular reinforcement fixing bracket. From this, further improved battery package lower casing 400's structural strength, guaranteed that battery package lower casing 400 can bear battery pack more firmly.

Wherein front battery module base plate 713 is located between front tubular reinforcement 751 and rear tubular reinforcement 752. Preferably, front tubular reinforcement 751 and rear tubular reinforcement 752 may be fixedly coupled with front battery module base plate 713. Further, the structural strength of the front battery module base plate 713 is further improved, ensuring that the front battery module assembly 710 is more stably mounted on the front battery module base plate 713.

The battery pack lower case assembly according to the embodiment of the present invention further includes a longitudinal connecting member 760, the longitudinal connecting member 760 being fixed to the upper surface of the bottom wall of the lower case 400, the longitudinal connecting member 760 being coupled to the front and rear

tubular reinforcing members

751 and 752, respectively. Alternatively, the longitudinal links 760 may be fixed to the front battery module base plate 713.

Front battery module bottom plate 713 includes left and right front battery

module bottom plates

713a and 713b, and left and right front battery

module bottom plates

713a and 713b are disposed on the left and right sides of longitudinal connection member 760, respectively. Left and right front battery

module bottom plates

713a and 713b may be welded or screwed to the longitudinal connection member 760, respectively.

The front and rear ends of the longitudinal links 760 are shorter than the middle portion connected between the front and rear ends, the right side edge of the left front battery module bottom plate 713a is fixed to the taller middle portion of the longitudinal links 760, the left side edge of the right front battery module bottom plate 713b is fixed to the taller middle portion of the longitudinal links 760, and the right side edge of the left front battery module bottom plate 713a is spaced apart from the left side edge of the right front battery module bottom plate 713b in the lateral direction of the battery module.

The tubular reinforcement fixing bracket includes a front tubular reinforcement fixing bracket 753 and a rear tubular reinforcement fixing bracket 754, and the dimension of the rear tubular reinforcement fixing bracket 754 in the lateral direction of the battery pack is larger than the dimension of the front tubular reinforcement fixing bracket 753 in the lateral direction.

Further, each of the left and right front battery

module bottom plates

713a and 713b is fixed with the front tubular reinforcement fixing bracket 753 and the rear tubular reinforcement fixing bracket 754. As a result, the structures of left front battery module bottom plate 713a and right front battery module bottom plate 713b are more stable, and front battery module assembly 710 can be more stably mounted on left front battery module bottom plate 713a and right front battery module bottom plate 713 b.

The front end of the middle battery module bottom plate 722 is fixed to the two rear tubular reinforcement fixing brackets 754 on the left and right sides, respectively, and the middle battery module bottom plate 722 is located at the middle position of the lower case 400 in the lateral direction of the battery pack.

Further, the battery pack lower case assembly further includes a rear reinforcing beam 770, the rear reinforcing beam 770 being fixed on the upper surface of the bottom wall of the lower case 400, the rear reinforcing beam 770 being fixed with the rear end of the middle battery module bottom plate 722.

The sensing board base plates 740 are located at the left and right sides of the middle battery module base plate 722, respectively, that is, two sensing board base plates 740 are located at the left and right sides of the middle battery module base plate 722, respectively.

The middle battery module bottom plate 722 is also provided with the MSD supporter 210, and the upper surface of the bottom wall of the lower case 400 is also provided with the BDU supporter located on the front side of the front tubular reinforcement 751.

The lower case 400 according to the embodiment of the present invention is provided with a plurality of bottom plates and brackets, so that the structural strength of the lower case 400 can be significantly improved, thereby improving the structural strength and rigidity of the entire battery pack.

The battery module in the prior art is mainly heated by a heating film, fluid and high-frequency alternating current electric heating, wherein the heating film is gradually heated and applied to the design of new energy automobile battery packs in various whole automobile factories, in the applications, double-sided adhesive tapes are mostly adopted for bonding and fixing between the heating film and the module surface, the fixing mode requires that the bonded surface is smooth and clean, and when the battery module is used in a complex environment for a long time, the double-sided adhesive tapes are easy to fall off, so that the heating performance is reduced and even the heating is ineffective, therefore, how to effectively fix the heating film on the battery surface is a technical problem to be solved in the power battery heating technology.

To this end, the present invention provides a battery module for a battery pack, and the battery module according to an embodiment of the present invention will be described in detail.

As shown in fig. 18 to 21, the battery module according to the embodiment of the present invention may include a module bracket 781, an electric heating sheet 782, and a battery body 783.

Module holder 781 is a support structure for the battery module, and module holder 781 may be supported by lower case 400, for example, module holder 781 may be fixed to or on front battery module bottom plate 713 and middle battery module bottom plate 722.

The electrical heating sheet 782 is arranged on the module bracket 781, and a module flexible structure 784 is arranged between the electrical heating sheet 782 and the module bracket 781; the battery body 783 is disposed on the electric heating sheet 782.

The electric heating sheet 782 can heat the battery body 783, so that the battery body 783 is kept at a proper working temperature, and the temperature of the electric heating sheet 782 can be regulated and controlled by a vehicle control center according to an external environment.

In some embodiments of the present invention, the modular flexible structure 784 is sheet-like and sandwiched between the electrical heat patch 782 and the modular bracket 781. Module flexible structure 784 can keep apart electrical heating piece 782 and module support 781, and when avoiding module flexible structure 784 part or whole to open glue, module flexible structure 784 and module support 781 direct contact and take place dangerously.

In addition, the power of producing through the compression of module flexible structure 784 can guarantee that electrical heating piece 782 and module support 781 are effectively laminated, prevents that module flexible structure 784 from droing, increases the heating effect.

In some embodiments of the present invention, the modular flexible structure 784 is the same shape as the electrical heat patch 782.

In other embodiments of the present invention, the modular flexible structure 784 is a flexible strip and is a plurality.

Specifically, the modular flexible structure 784 includes a front flexible strip 784a, a rear flexible strip 784b, a left flexible strip 784c, and a right flexible strip 784d, the front flexible strip 784a is disposed at the front end of the electrical heat patch 782, the rear flexible strip 784b is disposed at the rear end of the electrical heat patch 782, the left flexible strip 784c is disposed at the left end of the electrical heat patch 782, and the right flexible strip 784d is disposed at the right end of the electrical heat patch 782.

Further, two end faces of each of the front end flexible strip 784a and the rear end flexible strip 784b are flush with two longitudinal side edges of the electric heating sheet 782, respectively, the left end flexible strip 784c and the right end flexible strip 784d are oppositely arranged, and each distance from the front end flexible strip 784a and the rear end flexible strip 784b is equal.

In still another embodiment of the present invention, the plurality of flexible strips are spaced apart along the length of the battery module.

Further, both end surfaces of the flexible strip are flush with both longitudinal side edges of the electric heating sheet 782, respectively.

Further, the flexible strips of the plurality of flexible strips are narrower at the front and rear ends and wider between the front and rear ends.

According to the battery module provided by the embodiment of the invention, the whole module flexible structure 784 or the plurality of flexible strips are arranged between the module support 781 and the electric heating plate 782, so that even if the module flexible structure 784 or the plurality of flexible strips are locally fallen off, the electric heating plate 782 can be prevented from being directly contacted with the module support 781, and further danger is avoided.

It should be noted that the flexible strip may be fixed between the electric heating plate 782 and the module bracket 781 by a double-sided adhesive tape, but the flexible strip may be fixed between the electric heating plate 782 and the module bracket 781 by other methods.

In some embodiments of the invention, modular flexible structure 784 is foam. Preferably, the flexible structure is a high temperature resistant foam.

The tubular reinforcing structure for a battery pack according to an embodiment of the present invention will be described in detail below.

As shown in fig. 17, the tubular reinforcement structure according to the embodiment of the present invention may include a tubular reinforcement and a tubular reinforcement fixing bracket.

Wherein, tubulose reinforcement extends along the transversely of battery package, and the tubulose reinforcement is hollow tubular beam column structure, and tubulose reinforcement fixed bolster is fixed at the left end and the right-hand member of tubulose reinforcement, and tubulose reinforcement fixed bolster is connected with the internal surface fixed of the upper surface of the diapire of the lower casing 400 of battery package and the lateral wall of lower casing 400 respectively.

From this, can show the structural strength who improves lower casing 400, improve battery module's installation stability.

The tubular reinforcing device for the battery pack comprises the tubular reinforcing piece and the tubular reinforcing piece fixing support, and the tubular reinforcing piece fixing support can obviously improve the installation stability of the battery module.

In some embodiments of the present invention, the tubular reinforcement extends leftward to the sidewall of the left side of the lower case 400, and the right end of the tubular reinforcement extends rightward to the sidewall of the right side of the lower case 400.

The tubular reinforcement has a rectangular cross-section that can be easily fixedly coupled with the upper surface of the bottom wall of the lower case 400 and the inner surface of the sidewall of the lower case 400.

The tubular reinforcement includes a front tubular reinforcement 751 and a rear tubular reinforcement 752, the front tubular reinforcement 751 being disposed parallel to the rear tubular reinforcement and spaced apart in the longitudinal direction of the battery pack.

The tubular reinforcement means further comprises a longitudinal connector 760, the longitudinal connector 760 being fixed to the upper surface of the bottom wall of the lower case 400, the longitudinal connector 760 being connected to the front tubular reinforcement 751 and the rear tubular reinforcement 752, respectively. Alternatively, the longitudinal connector 760 may be welded or screw-fixed to the bottom wall of the lower case 400.

The front end of the longitudinal connector 760 is fixed to the middle of the front tubular reinforcement 751, and the rear end of the longitudinal connector 760 is fixed to the middle of the rear tubular reinforcement 752.

Further, the number of fixing positions of the front tubular reinforcement 751 and the front tubular reinforcement fixing bracket 753 is smaller than the number of fixing positions of the rear tubular reinforcement 752 and the rear tubular reinforcement fixing bracket 754.

In the specific example of the present invention, the fixing points of the front tubular reinforcement 751 to the front tubular reinforcement fixing bracket 753 are 5, and the fixing points of the rear tubular reinforcement 752 to the rear tubular reinforcement fixing bracket 754 are 7.

The square front and rear

tubular reinforcements

751 and 752 can effectively absorb impact energy to protect the battery module when the vehicle is impacted.

Preferably, the tubular reinforcement is provided with a tubular reinforcement lightening hole. And then can reduce the weight of tubular reinforcement under the intensity of guaranteeing self intensity, reduce the energy consumption of vehicle.

In addition, the tubular reinforcement lightening hole constitutes a tubular reinforcement wire harness/copper bar fixing hole for fixing the wire harness/copper bar. In other words, the tubular reinforcement lightening hole can also be used for fixing the wire harness/copper bar pair.

The tubular reinforcing device provided by the embodiment of the invention can effectively improve the overall rigidity and strength of the battery pack, can carry out all-dimensional protection on the battery module, and can fix the wire harness and the copper bar in the battery pack.

In the prior art, the number of low-voltage wire harnesses and heating film wire harnesses in the power battery pack is large, so that the safety problem in the power battery pack caused by abrasion or breakage of the wire harnesses in the driving process is solved, the wire harnesses can be fixed through a fixing device, and the safety is guaranteed.

To this end, the present invention proposes a pouch 820 for a battery pack, and the pouch 820 of an embodiment of the present invention may include a pouch body 821 and a cover 822.

As shown in fig. 22 to 25, the wire protection box body 821 extends in the longitudinal direction of the battery pack, both longitudinal ends and the top end of the wire protection box body 821 are open, and the left side wall and the right side wall of the wire protection box body 821 are provided with wire harness avoiding grooves 801; the box cover 822 is arranged on the top of the wire protecting box body 821, and the box cover 822 is clamped and fixed with the wire protecting box body 821.

The wire protecting box body 821 and the box cover 822 can effectively protect the wire harness, and effectively reduce the abrasion and breakage probability of the wire harness. And the wire harness may pass through the escape groove on the wire protection box 820 to be connected with the battery module.

In some embodiments of the present invention, the wire harness escape groove 801 is a "U" shaped groove, and an opening at an upper end of the "U" shaped groove is provided on an upper end surface of a side wall of the harness body 821.

A wire protecting box wire harness fastening hole 802 is further formed in the left side wall and the right side wall of the wire protecting box body 821, and a wire harness can penetrate through the wire protecting box fastening hole 802 and is connected with the battery module.

A box cover buckle 822a is respectively arranged at the left side edge and the right side edge of the box cover 822, a box protection box clamp hole 803 is respectively arranged on the left side wall and the right side wall of the box protection box body 821, and the box cover buckle 822a is clamped in the box protection box clamp hole 803, so that the box cover 822 and the box protection box body 821 are fixed together.

The left side edge and the right side edge of the box cover 822 are respectively provided with a box cover limiting protrusion 822b, the left box cover limiting protrusion 822b is attached to the outer wall surface of the left side wall of the wire protection box body 821, and the right box cover limiting protrusion 822b is attached to the outer wall surface of the right side wall of the wire protection box body 821.

From this, further improved lid 822 and the joint strength who protects line box body 821, lid 822 installation is stable, be difficult to drop, has effectively guaranteed the installation stability of pencil.

Further, the box cover limiting protrusions 822b are divided into a plurality of groups, each group has three box cover limiting protrusions 822b, and the length of the two box cover limiting protrusions 822b positioned at the two ends of each group is smaller than that of the box cover limiting protrusion 822b positioned in the middle.

In some embodiments of the present invention, the inner wall surfaces of the left and right side walls of the grommet body 821 are further provided with vertically extending grommet reinforcing ribs 821a, the grommet reinforcing ribs 821a extending downward onto the upper surface of the bottom wall of the grommet body 821.

From this, can improve the structural strength of protecting line box body 821, guarantee that protecting line box body 821 can protect the pencil better.

In some embodiments of the present invention, the box cover 822 includes a plurality of sub-box covers 822c, and a sub-box cover connection part with a reduced thickness is disposed between two adjacent sub-box covers 822c, so that the two adjacent sub-box covers 822c can be bent relatively. Therefore, the sub-box cover 822c can be conveniently opened, and when a certain part of the wire harness is damaged and needs to be replaced, the part of the box cover 822 can be opened to repair or replace the damaged wire harness.

A wire protecting box fixing hole 804 is formed in the bottom wall of the wire protecting box body 821, and a wire protecting box 820 metal ferrule is embedded in the wire protecting box fixing hole 804. An internal thread may be provided in the metal collar, and the thread protector body 821 may be screwed to the lower case 400 by the metal collar.

Specifically, the front and rear ends of the longitudinal link 760 are shorter than the middle portion connected between the front and rear ends, whereby the longitudinal link 760 can support the entire grommet 820.

The wire protecting box body 821 is a plastic piece added with glass fiber, the box cover 822 is a plastic piece, and the box cover weight reducing hole 805 is formed in the box cover 822. Specifically, the capsule body 821 may be an injection molded article of PBT-GF30, and the capsule cover 822 may be a piece of PA 66.

The wire protecting box 820 for the battery pack in the embodiment of the invention can enable the heating film wire harness and the low-voltage wire harness in the battery pack to be integrated and arranged neatly, so that the fixation is firmer, and the safety problem caused by the abrasion or the breakage of the wire harness is avoided.

Most battery cut-off unit (BDU) shells in the related art adopt an upper shell and lower shell clamping structure, and the clamping structure is high in strength because of no bolt fixing structure, so that the shells are easy to deform after being assembled; the lower shell of the battery cut-off unit (BDU) is provided with a plurality of fixed electric devices, and the fixed installation and the connection wire harness have corresponding position requirements, so that the position and direction installation errors of the electric devices are easy to exist; meanwhile, the thickness of the lower shell is larger, so that the weight of the shell is increased.

To this end, the present invention proposes a BDU810 for a vehicle, and the BDU810 for a vehicle according to an embodiment of the present invention is described in detail below.

As shown in fig. 26-27, a BDU810 for a vehicle according to the present invention may include a BDU housing 811, main positive and

negative relays

812, 813, pre-charge and resistance relays 814, 815, a heater relay 816, and a heater fuse 817.

The BDU housing 811 includes a BDU base plate 811a and a BDU upper case 811b provided on the BDU base plate 811. The BDU upper shell 811b is provided with a wire-catching structure on the top surface on which a wire harness can be caught. Optionally, the wire clamping structure is a wire clamping groove.

Main positive relay 812 and main negative relay 813 are disposed within BDU housing 811, and pre-charge relay 814 and pre-charge resistor 815 are disposed within BDU housing 811 and are disposed in parallel with main positive relay 812; a heater relay 816 and a heater fuse 817 are disposed within the BDU housing 811.

Main positive relay 812 and main negative relay 813 are fixed at the middle position of BDU base plate 811a, pre-charge relay 814, heating relay 816 and heating fuse 817 are fixed on BDU base plate 811a and located at one side of main positive relay 812 and main negative relay 813, and pre-charge resistor 815 is fixed on BDU base plate 811a and located at the other side of main positive relay 812 and main negative relay 813.

BDU810 for a vehicle also includes shunt 818, shunt 818 being secured to BDU chassis 811a, and shunt 818 being located adjacent to pre-charge resistor 815 in front of and behind it.

Further, a pre-charge relay 814, a heating relay 816, a heating fuse 817, a main positive relay 812, a main negative relay 813, and a shunt 818 are arranged in a row.

BDU base plate 811 is also provided with a shunt enclosure 818a and shunt 818 is built into shunt enclosure 818a so that shunt 818 can be more securely mounted to BDU base plate 811 a.

The BDU base plate 811a is further provided with a pair of positive clamp plates 812a and a pair of negative clamp plates 813a, the main positive relay 812 is disposed between the pair of positive clamp plates 812a, and the main negative relay 813 is disposed between the pair of negative clamp plates 813 a. Thus, main positive relay 812 and main negative relay 813 can be more securely mounted on BDU backplane 811 a.

The BDU bottom plate 811a is also provided with a main positive relay error-proofing part and a main negative relay error-proofing part. Therefore, the main positive relay 812 and the main negative relay 813 can be prevented from being installed in a wrong way, and the installation efficiency of the BDU810 is remarkably improved.

The BDU base plate 811a is further provided with a pair of heating plates 816a, the heating relay 816 is arranged between the pair of heating plates 816a, the BDU base plate 811a is further provided with a fuse enclosure 817a, the heating fuse 817 is arranged between the fuse enclosures 817a, and the pre-charging relay 814 is arranged between the fuse enclosure 817a and an adjacent one of the heating plates 816 a.

The BDU bottom plate 811a is provided with a pre-charging relay anti-misassembly part, and the heating clamp plate is provided with a heating relay anti-misassembly part. Therefore, the pre-charging relay 814 and the heating relay 816 can be prevented from being assembled in a wrong mode, and the installation efficiency and accuracy of the BDU810 are greatly improved.

The BDU base plate 811a is provided with a BDU reinforcing rib 811c, the BDU reinforcing rib 811c is provided adjacent to an edge of the BDU base plate 811a, and the extending length of the BDU reinforcing rib 811c exceeds at least half of the circumference of the outer edge of the BDU base plate 811 a. Therefore, the structural strength of the BDU bottom plate 811 is further improved, the structural stability of the BDU810 is guaranteed, and electric devices in the BDU810 are in a more stable and safe working environment.

The BDU810 of the embodiment of the invention comprises a BDU bottom plate 811a and a BDU upper shell 811b, wherein the BDU bottom plate 811a and the BDU upper shell 811b have higher sealing performance and deformation resistance in matching; electric devices on the BDU base plate 811a have an error-proofing function, and the position installation error and the direction installation error of the same electric device are avoided; the BDU bottom plate 811a is provided with the BDU reinforcing ribs 811c, so that the structural strength of the shell can be increased. The battery cut-off unit (BDU810) of the embodiment of the invention fixedly installs the integrated electric device, effectively utilizes the space of the power battery pack and protects the functional safety of the electric device.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A battery pack, comprising:

a housing including a lower housing and an upper housing;

a battery module device disposed within the housing, the battery module device including a plurality of layers of battery module assemblies having battery modules stacked in multiple layers;

a battery cut-off unit BDU disposed in the housing and located at a front side of the battery module device;

a manual service switch MSD, the MSD disposed within the housing and a top of the MSD passing through the upper housing;

the control panel is arranged in the shell and is connected with the battery module device;

an MSD access hole is formed in the upper shell of the battery pack, the MSD extends out of the MSD access hole, the MSD is fixed to the upper shell of the battery pack through an MSD supporting plate, and an MSD top avoiding hole used for avoiding the top of the MSD is formed in the MSD supporting plate; an MSD support is fixed on the lower shell of the battery pack, an MSD support groove is formed in the MSD support, an MSD flange is arranged on the MSD, the MSD flange is accommodated in the MSD support groove and can be fixed in the MSD support groove, and a first MSD sealing gasket is arranged between the upper surface of a groove surrounding wall and the lower surface of the upper shell;

double-deck module bracket component, double-deck module bracket component includes lower floor's module fore-stock, lower floor's module left socle, lower floor's module right branch frame and intermediate bottom, lower floor's module fore-stock lower floor's module left socle lower floor's module right branch frame with intermediate bottom limits the battery installation space of lower floor that is used for installing lower floor's battery module jointly, intermediate bottom is used for installing upper battery module.

2. The battery pack of claim 1, further comprising: the tubular reinforcing member extends along the transverse direction of the battery pack, is of a hollow tubular beam-shaped structure, and is fixed in the lower shell through a tubular reinforcing member fixing support.

3. The battery pack of claim 1, further comprising: a bottom plate, the bottom plate is fixed on the lower surface of the diapire of lower casing, the bottom plate includes:

a lower pallet frame body;

the two ends of the lower supporting plate cross beams are respectively fixed with the left longitudinal frame strip and the right longitudinal frame strip of the lower supporting plate frame body, and the lower supporting plate cross beams are distributed at intervals along the longitudinal direction of the battery pack;

the two ends of the lower supporting plate supporting beam are respectively fixed with the left longitudinal frame strip and the right longitudinal frame strip of the lower supporting plate frame body, and the lower supporting plate supporting beam is arranged close to one lower supporting plate cross beam in the middle.

4. The battery pack of claim 3, wherein the bottom plate cross member is provided with a bottom plate cross member lightening hole.

5. The battery pack of claim 1, further comprising: a tubular reinforcement device, the tubular reinforcement device comprising:

a tubular reinforcement extending in a lateral direction of the battery pack, the tubular reinforcement being a hollow tubular beam-like structure;

the battery pack comprises a tubular reinforcing part fixing support, wherein the tubular reinforcing part fixing support is fixed at the left end and the right end of the tubular reinforcing part, and the tubular reinforcing part fixing support is fixedly connected with the upper surface of the bottom wall of the lower shell of the battery pack and the inner surface of the side wall of the lower shell.

6. The battery pack according to claim 5, wherein the tubular reinforcement extends leftward to a side wall of a left side of the lower case, and a right end of the tubular reinforcement extends rightward to a side wall of a right side of the lower case.

7. The battery pack of claim 5, wherein the tubular reinforcement has a rectangular cross-section.

8. The battery pack of claim 5, wherein the tubular reinforcement comprises:

a front tubular reinforcement and a rear tubular reinforcement, the front tubular reinforcement being disposed in parallel with the rear tubular reinforcement and spaced apart in a longitudinal direction of the battery pack.

9. The battery pack according to claim 8, further comprising:

a longitudinal connector fixed on an upper surface of a bottom wall of the lower housing, the longitudinal connector being connected to the front tubular reinforcement and the rear tubular reinforcement, respectively.

10. The battery pack of claim 1, further comprising: protect line box, protect line box includes:

the battery pack comprises a wire protection box body, wherein the wire protection box body extends along the longitudinal direction of the battery pack, the longitudinal two ends and the top of the wire protection box body are open, and wire harness avoiding grooves are formed in the left side wall and the right side wall of the wire protection box body;

the box cover is arranged at the top of the wire protection box body and fixedly connected with the wire protection box body in a clamping mode.

11. The battery pack according to claim 10, wherein the wire harness escape groove is a "U" -shaped groove, and an opening at an upper end of the "U" -shaped groove is provided on an upper end surface of a side wall of the pouch body.

12. The battery pack according to claim 10, wherein the left and right side walls of the wire protection box body are further provided with wire protection box harness fastening holes.

13. The battery pack according to claim 10, wherein the left side edge and the right side edge of the box cover are respectively provided with a box cover buckle, the left side wall and the right side wall of the wire protection box body are respectively provided with a wire protection box clamping hole, and the box cover buckle is clamped in the wire protection box clamping hole.

14. The battery pack according to claim 10, wherein a left side edge and a right side edge of the box cover are respectively provided with a box cover limiting protrusion, the left side of the box cover limiting protrusion is attached to the outer wall surface of the left side wall of the wire protection box body, and the right side of the box cover limiting protrusion is attached to the outer wall surface of the right side wall of the wire protection box body.

15. The battery pack according to claim 14, wherein the lid limiting protrusions are divided into a plurality of groups, three lid limiting protrusions are provided in each group, and the length of two lid limiting protrusions located at both ends of each group is smaller than the length of the lid limiting protrusion located in the middle.