CN210535716U

CN210535716U - Lower shell of battery pack and battery pack

Info

Publication number: CN210535716U
Application number: CN201921419153.4U
Authority: CN
Inventors: 马腾; 唐丽娟; 钱佳博; 魏艳彬
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2019-08-28
Filing date: 2019-08-28
Publication date: 2020-05-15
Anticipated expiration: 2029-08-28

Abstract

The utility model relates to a battery field provides a lower casing and battery package of battery package, the lower casing of battery package includes the bottom plate and is fixed in the electric core of bottom plate holds the frame, the bottom plate with electric core holds the frame and encloses to form electric core and holds the chamber, electric core holds the frame can to place in electric core holds the electric core in the chamber and plays limiting displacement. The lower casing of battery package hold the frame through bottom plate and electric core and enclose and close formation electric core and hold the chamber, can pile up back with an electric core or a plurality of electric core and directly put into electric core and hold the chamber, need not to assemble into the battery module with electric core again and then put into the battery package, simplify the structure of battery package, reduce the frame construction in the battery package to improve the energy density of battery package, make under the condition of equal electric capacity, reduce the required space of arranging of battery package.

Description

Lower shell of battery pack and battery pack

Technical Field

The utility model relates to a battery technology field, in particular to lower casing and battery package of battery package.

Background

With the increasing severity of energy crisis and environmental pollution, new energy automobiles are increasingly developed in various countries. The battery is used as a main stream energy storage device of the new energy automobile, and the energy density of the battery directly influences the cruising ability of the whole automobile due to the limited arrangement space in the automobile. In order to increase the overall energy density of the battery, the space in the battery pack is precious.

Therefore, it is desirable to have a structure capable of simplifying the structure of a battery pack to increase the energy density thereof while securing the reliability and safety of the battery pack.

SUMMERY OF THE UTILITY MODEL

At present, the assembly of battery package adopts earlier to form the battery module with electric core and then puts into battery package casing more, and the structure is more loaded down with trivial details, the lightweight of the battery package of being not convenient for.

In view of this, the present invention is directed to a lower housing of a battery pack, so as to simplify the structure of the battery pack and improve the energy density of the battery pack.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

the utility model provides a lower casing of battery package, the lower casing of battery package includes the bottom plate and is fixed in the electric core of bottom plate holds the frame, the bottom plate with electric core holds the frame and encloses to form electric core and holds the chamber, electric core hold the frame can to place in electric core holds the electric core in the chamber and plays limiting displacement.

Further, the battery cell accommodating frame comprises a rectangular outer frame and partition plates for dividing the battery cell accommodating cavity into a plurality of accommodating cavity components.

Furthermore, the rectangle frame includes along the tip clamp plate that the width direction of rectangle frame extends and follows the curb plate that the length direction of rectangle frame extends, the division board includes along the middle part clamp plate that the width direction of rectangle frame extends and follow the middle part baffle that the length direction of rectangle frame extends, wherein, the tip clamp plate with the middle part clamp plate can to hold in the pressing force is applyed to the electric core that the chamber was held to the electric core.

Further, a wire harness fixing structure is formed on the middle pressing plate, wherein the wire harness fixing structure is formed as a groove located at one end of the middle pressing plate far away from the bottom plate, and the wire harness fixing structure is located in the middle of the middle pressing plate along the thickness direction of the middle pressing plate; or the wire harness fixing structure is a concave structure which is positioned at one end of the middle pressing plate far away from the bottom plate, and the wire harness fixing structure is positioned at two ends of the middle pressing plate along the thickness direction of the middle pressing plate.

Further, follow the thickness direction of bottom plate, the lower casing of battery package including range upon range of arrange in electric core holds the frame and keeps away from the range upon range of electric core of one side of bottom plate holds the support, range upon range of electric core holds the support and is formed with additional electric core and holds the chamber, range upon range of electric core holds the support and can to place in the additional electric core that additional electric core held the chamber plays limiting displacement.

The laminated battery cell accommodating support comprises a laminated bottom plate and a laminated battery cell accommodating frame fixed on the laminated bottom plate, the laminated bottom plate and the laminated battery cell accommodating frame enclose to form the additional battery cell accommodating cavity, and the laminated battery cell accommodating frame comprises a laminated rectangular outer frame and a laminated partition plate for dividing the laminated battery cell accommodating cavity into a plurality of laminated accommodating cavity components; and/or the battery cell accommodating frame is provided with a laminated support fixing structure, and the laminated battery cell accommodating support is fixedly arranged on the laminated support fixing structure through a threaded mounting piece.

Further, the lower shell of the battery pack comprises a plurality of battery cell accommodating frames fixed on the bottom plate.

Further, the bottom plate is formed into a double-layer plate structure corresponding to the position of the battery cell accommodating frame.

Further, the bottom plate includes the plate body and set up in the boundary beam of the periphery of plate body, wherein, the boundary beam is including being close to the plate body fixed part of plate body and keeping away from the periphery rib of plate body, the plate body is fixed in the plate body fixed part, and electric core hold the frame with be formed with the buffering clearance between the periphery rib.

Compared with the prior art, the lower shell of battery package have following advantage:

the lower casing of battery package hold the frame through bottom plate and electric core and enclose and close formation electric core and hold the chamber, can pile up back with an electric core or a plurality of electric core and directly put into electric core and hold the chamber, need not to assemble into the battery module with electric core again and then put into the battery package, simplify the structure of battery package, reduce the frame construction in the battery package to improve the energy density of battery package, make under the condition of equal electric capacity, reduce the required space of arranging of battery package.

Another objective of the present invention is to provide a battery pack to simplify the structure of the battery pack and improve the energy density thereof.

a battery pack provided with: the lower case of the battery pack according to the above; the battery cell module comprises a plurality of battery cells, the battery cells are arranged in a stacked manner along the thickness direction of the battery cells, the battery cell module is installed in the battery cell accommodating cavity, and the battery cell accommodating frame applies pressing force along the thickness direction of the battery cells to the battery cell module; and the battery cell upper cover covers the upper side of the battery cell module and is fixed on the lower shell of the battery pack.

Furthermore, a glue filling fixing part is formed between the battery cell module and the lower shell of the battery pack.

Further, the battery pack comprises a limiting pressing strip fixedly installed on the lower shell of the battery pack and extending in the thickness direction of the battery cell, wherein the limiting pressing strip comprises an upper cover fixing part and a battery cell limiting part, the upper cover fixing part is in press-connection with the battery cell upper cover to be far away from one side of the battery cell module, and the battery cell limiting part is inserted into the battery cell module and the battery cell accommodating frame.

The advantages of the battery pack and the lower case of the battery pack are the same as those of the prior art, and are not described herein again.

Other features and advantages of the present invention will be described in detail in the detailed description which follows.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:

fig. 1 is a schematic view of a battery pack according to an embodiment of the present invention;

fig. 2 is an exploded view of the battery pack shown in fig. 1;

fig. 3 is a schematic view of a bottom plate and a cell accommodating frame of a lower case of the battery pack shown in fig. 1;

fig. 4 is an exploded view of the bottom plate and the cell receiving frame of the lower case of the battery pack shown in fig. 3;

fig. 5 is an exploded view of one of the plate bodies, the cell accommodating frame, the cell module, the limiting pressing bar, and the cell upper cover of the battery pack shown in fig. 1;

fig. 6 is a schematic diagram of one of the plate bodies, the cell accommodating frame and the limiting pressing bar of the battery pack shown in fig. 1;

FIG. 7 is a schematic view of a plate body, side plates and a middle spacer of the lower case of the battery pack shown in FIG. 3;

fig. 8 is a schematic view of an end pressing plate of the lower case of the battery pack shown in fig. 3;

fig. 9 is a schematic view of a middle pressing plate of the lower case of the battery pack shown in fig. 3;

fig. 10 is a schematic view of another middle press plate of the lower case of the battery pack shown in fig. 3;

fig. 11 is a schematic view of a laminated cell containment bracket of the battery pack shown in fig. 1;

fig. 12 is a schematic view of a laminated bottom plate, a laminated side plate, and a laminated middle separator of the laminated cell housing bracket shown in fig. 11;

figure 13 is a schematic view of a laminated middle press plate of the laminated cell containment bracket shown in figure 11;

fig. 14 is a schematic view of an edge-limiting bead of the battery pack shown in fig. 1;

fig. 15 is a schematic view of a middle stopper bead of the battery pack shown in fig. 1.

Description of reference numerals:

1-bottom plate, 11-plate body, 111-laminated plate, 12-edge beam, 121-periphery reinforcement, 122-plate body fixing part, 2-battery cell containing frame, 21-end pressing plate, 22-side plate, 221-outlet opening, 23-middle partition plate, 24-middle pressing plate, 241-wire harness fixing structure, 25-laminated support fixing structure, 3-battery cell upper cover, 4-limiting pressing strip, 41-edge limiting pressing strip, 42-middle limiting pressing strip, 43-upper cover fixing part, 44-battery cell limiting part, 5-lifting lug, 6-laminated battery cell containing support, 61-laminated side plate, 62-laminated middle partition plate, 63-laminated middle pressing plate, 64-laminated end pressing plate and 65-laminated bottom plate, 7-threaded mounting piece, 8-cell module, 81-cell, 82-heating plate, 821-heating plate wire harness, 9-additional cell module and 91-additional cell.

Detailed Description

In the present invention, the embodiments and the features of the embodiments may be combined with each other without conflict.

In addition, in the embodiments of the present invention, the upper, lower, top, and bottom are referred to as upper, lower, top, and bottom in the drawings, and the inner and outer are referred to as inner and outer with respect to the outline of the component itself. This orientation description is intended only to illustrate the specific structure of the claimed device and is not intended to limit the invention.

The present invention will be described in detail with reference to the accompanying drawings in conjunction with embodiments.

According to the utility model discloses an aspect provides a lower casing of battery package, refer to fig. 1, fig. 2 and fig. 3, the lower casing of battery package includes that bottom plate 1 and the electric core that is fixed in bottom plate 1 hold frame 2, and bottom plate 1 and electric core hold frame 2 to enclose to close and form electric core and hold the chamber, and electric core holds frame 2 can to place in electric core holds electric core 81 in the chamber and plays limiting displacement.

The lower casing of above-mentioned battery package holds frame 2 through bottom plate 1 and electric core and encloses to close and form electric core and hold the chamber, can pile up back direct putting into electric core with an electric core 81 or a plurality of electric core 81 and hold the chamber, need not to assemble into the battery module with electric core again and puts into the battery package, simplifies the structure of battery package, reduces the frame construction in the battery package to improve the energy density of battery package, make under the condition of equal electric capacity, reduce the required space of arranging of battery package.

Referring to fig. 1 and 3, the electric core holds frame 2 and includes the rectangle frame and will the electric core holds the chamber to separate for a plurality of division boards that hold the chamber component to hold the chamber with the battery and separate for a plurality of chamber components that hold that the size is suitable, be convenient for placing of electric core 81, and improve electric core 81 stability. Referring to fig. 2, a cell module 8 is formed by stacking a proper number of cells 81 according to the size of the accommodating cavity component, and the cell module 8 is integrally placed in the corresponding accommodating cavity component by using a jig. Wherein, the shape and the size that each holds the chamber component part can be the same also can be different, and the user can hold the chamber to electric core according to the user demand and carry out appropriate partition.

The specific structures of the rectangular outer frame and the partition plate can be properly selected according to actual needs, referring to fig. 3 and 4, the rectangular outer frame comprises an end pressing plate 21 extending along the width direction of the rectangular outer frame and a side plate 22 extending along the length direction of the rectangular outer frame, and the end pressing plate 21 arranged at intervals and the side plate 22 arranged at intervals are spliced to form the rectangular outer frame. The partition plate comprises a middle pressing plate 24 extending along the width direction of the rectangular outer frame and a middle partition plate 23 extending along the length direction of the rectangular outer frame, wherein the end pressing plate 21 and the middle pressing plate 24 can apply pressing force to the battery cell 81 accommodated in the accommodating cavity component.

Referring to fig. 6, a plurality of battery cells 81 are sequentially stacked in the length direction of the rectangular outer frame, and the middle pressing plate 24 and the end pressing plate 21 apply a pressing force to the battery cells 81 in the length direction of the rectangular outer frame (i.e., in the thickness direction of the battery cells 81), so that the battery cells 81 are pressed against each other, and thus the battery cells 81 have sufficient stability. During assembly, after the battery cell module 8 formed by the battery cells 81 is compressed by the clamp, the battery cell module 8 is placed into the accommodating cavity component, and after the clamp is withdrawn, the battery cell module 8 is compressed by the end pressing plate 21 and the middle pressing plate 24.

To facilitate the wiring harness arrangement of the cell module 8, the middle press plate 24 is preferably formed with a wiring harness fixing structure 241. Further, the wire harness fixing structure may also be arranged at an appropriate position of the side plate 22, the end pressing plate 21, or the like, if necessary.

The specific structure of the wire harness fixing structure 241 may be appropriately selected according to actual needs. Since the electrical connection terminals of the cell modules 8 are usually located at the upper ends thereof remote from the base plate 1, referring to fig. 9, the wire harness fixing structure 241 is formed as a groove located at one end of the middle pressing plate 24 remote from the base plate 1, and the wire harness fixing structure 241 is located at an intermediate position of the middle pressing plate (24) in the thickness direction of the middle pressing plate 24. Referring to fig. 10, the wire harness fixing structure 241 is formed as a recessed structure at one end of the middle presser plate 24 away from the base plate 1, and the wire harness fixing structure 241 is located at both end positions of the middle presser plate 24 in the thickness direction of the middle presser plate 24.

The battery pack generally further includes an upper case fixedly mounted to the lower case of the battery pack, wherein the upper case is generally injection molded, and therefore, the inner side surface of the upper case has a certain draft angle. Referring to fig. 8, the side of the end pressing plate 21 away from the cell accommodating cavity is formed into an inclined plane inclined toward the cell accommodating cavity from bottom to top, so that the intrusion of the draft angle of the upper casing of the battery pack into the assembly space can be avoided, and a certain guiding effect on the assembly between the upper casing and the lower casing can be achieved.

Referring to fig. 7, an outlet opening 221 is formed in the side plate 22 to facilitate the outlet of the cell module 8. Referring to fig. 1 and 2, in the illustrated embodiment, the outlet opening 221 is used for outlet of the heat patch 82, and the specific structure is described in detail below.

Referring to fig. 1, fig. 2 and fig. 11, along the thickness direction of bottom plate 1, the lower casing of battery pack holds support 6 including range upon range of the range of electric core that arranges in electric core holds frame 2 and keep away from one side of bottom plate 1, and range upon range of electric core holds support 6 and is formed with additional electric core and holds the chamber, and range upon range of electric core holds support 6 and can hold the additional electric core 91 of chamber to placing in additional electric core plays limiting displacement for the lower casing of battery pack can place the two-layer electric core module of range upon range of arrangement, thereby further improves the energy density of battery pack. If necessary, a plurality of layers of the laminated cell accommodating holder 6 may also be laminated on the cell accommodating frame 2.

The structure of the laminated battery cell accommodating bracket 6 can be designed appropriately according to actual needs, and is preferably similar to the battery cell accommodating frame 2, so that the structure of the battery pack is neat and attractive, and the arrangement of the battery pack is convenient. Referring to fig. 11, the laminated cell accommodating bracket 6 includes a laminated bottom plate 65 and a laminated cell accommodating frame fixed to the laminated bottom plate, and the laminated bottom plate 65 and the laminated cell accommodating frame enclose the additional cell accommodating cavity, where the laminated cell accommodating frame includes a laminated rectangular outer frame and a laminated partition plate dividing the laminated cell accommodating cavity into a plurality of laminated accommodating cavity components.

The laminated cell accommodating support 6 can be fixed to any appropriate position of the lower casing of the battery pack, for example, the bottom plate 1 of the lower casing of the battery pack, but since the cell accommodating frame 2 is arranged between the laminated cell accommodating support 6 and the bottom plate 1 at an interval, the laminated cell accommodating support 6 is difficult to be stably and reliably fixed to the bottom plate 1, and therefore, preferably, the cell accommodating frame 2 is formed with a laminated support fixing structure 25, and the laminated cell accommodating support 6 is fixedly installed on the laminated support fixing structure 25 through the threaded installation part 7, so that the installation and fixation of the laminated cell accommodating support 6 are facilitated.

Referring to fig. 3, the top of the end pressing plate 21 and the middle pressing plate 24 of the cell accommodating frame 2 provided with the laminated cell accommodating bracket 6 are protruded out of the side plate 22, and threaded mounting holes are formed, and the laminated cell accommodating bracket 6 is fixedly mounted on the cell accommodating frame 2 through the threaded mounting pieces 7.

Referring again to fig. 11, 12 and 13, the laminated cell housing bracket 6 is formed in a similar configuration to the cell housing frame 2 and the base plate 1, and specifically, the laminated cell housing bracket 6 includes a laminated base plate 65, laminated side plates 61 formed as a laminated rectangular outer frame, and laminated end pressing plates 64, and the laminated partition plate includes a laminated middle partition plate 62 and a laminated middle pressing plate 63.

The laminated middle platen 63 is formed with a laminated harness mounting structure 631, see fig. 13, the laminated harness mounting structure 631 being formed as a recess in the top of the laminated middle platen 63. The laminated harness mounting structure 631 may also be formed as a removed material portion like the harness mounting structure 241 shown in fig. 10, or as another suitable structure, if necessary.

Referring to fig. 12, in the illustrated embodiment, the stacking side plate 61 of the stacked cell accommodating bracket 6 is formed as a whole, the stacking side plate 61 is formed as a whole, the stacking center pressing plate 63 is formed with overlapping protrusions 632 at both ends thereof in the width direction of the stacked cell accommodating bracket 6, and the stacking side plate 61 is formed with overlapping grooves 612 corresponding to the overlapping protrusions 632, so as to facilitate positioning and installation of the stacking center pressing plate 63. The laminated middle partition plate 62 is formed as two plate bodies spaced apart from each other, and the laminated middle pressing plate 63 passes through a gap therebetween. Wherein, specific structure that range upon range of electric core held the frame can carry out appropriate design according to actual need, can hold the chamber with range upon range of electric core and separate for a plurality of suitable holding chamber components parts can.

Referring again to fig. 12, in the illustrated embodiment, the laminated bottom plate 65, the laminated side plates 61, and the laminated middle partition plate 62 are integrally formed, and the three may be joined together by any suitable means such as welding or screwing, or they may be integrally formed by injection molding, and the laminated end pressing plates 64 and the laminated middle pressing plates 63 are welded to the laminated bottom plate 65, the laminated side plates 61, and the laminated middle partition plate 62, thereby forming the laminated cell housing bracket 6.

The laminated middle partition plate 62, the laminated bottom plate 65 and the middle pressing plate 24 are provided with fixing holes corresponding to each other, and middle fastening bolts sequentially penetrate through the laminated middle partition plate 62, the laminated bottom plate 65 and the middle pressing plate 24 to fix the three together, so that the strength of the lower shell of the battery pack is further improved.

Preferably, the lower casing of the battery pack comprises a plurality of battery cell accommodating frames 2 fixed on the bottom plate 1, and the number and the arrangement mode of the battery cell accommodating frames 2 can be selected appropriately according to actual requirements. Referring to fig. 1, two cell accommodating frames 2 are arranged side by side on a bottom plate 1, and a stacked cell accommodating bracket 6 is arranged on the upper side of one cell accommodating frame 2. The structure of the cell housing frame 2 may be appropriately selected depending on whether or not the laminated cell housing bracket 6 is provided.

Preferably, the bottom plate 1 includes a plate body 11 and an edge beam 12 disposed at the periphery of the plate body 11, wherein the edge beam 12 includes a plate body fixing portion 122 close to the plate body 11 and a periphery reinforcing portion 121 far away from the plate body 11, the plate body 11 is fixed to the plate body fixing portion 122, and a buffering gap is formed between the cell accommodating frame 2 and the periphery reinforcing portion 121, the strength of the periphery reinforcing portion 121 is better, so as to better protect a cell in a battery pack, and a buffering gap is formed between the cell accommodating frame 2 and the periphery reinforcing portion 121, so as to avoid or reduce the influence of external impact on the cell. In addition, the plate body 11 and the laminated plate 111 parallel to the plate body 11 are formed as a double-plate structure, thereby better protecting the battery cells 81 in the cell accommodating chambers.

The outer side of the edge beam 12 is fixed with a lifting lug 5 so as to facilitate the installation and fixation of the battery pack and electric equipment such as a vehicle. Also, the upper surface of the outer circumferential reinforcement part 121 is formed as a sealing surface that is fitted to the upper case of the battery pack, and the upper case and the lower case are fixed together by a screw fitting.

In the illustrated embodiment, the side plates 22, the plate body 11, the laminated plate 111, and the middle partition plate 23 are formed as a whole by welding, screwing, or the like, and then fixed together with the edge beam 12 to form the bottom plate 1, and the end pressing plates 21 are welded to the edge beam 12 to better support the expansion of the cell modules 8. In addition, along the width direction of the rectangular outer frame, two ends of the end pressing plate 21 protrude from the side plates 22, so that the side plates 22 are welded to the end pressing plate. In addition, each side of the rectangular outer frame comprises a plurality of side plates 22 which are separated from each other, and the middle pressing plate is fixedly welded at the interval between the adjacent side plates 22.

In addition, in order to avoid the welding seam, the mounting etc. of the joint position of each plate on electric core accommodation frame 2 and the range upon range of electric core accommodation frame 6 to encroach on the space that electric core accommodation chamber and range upon range of electric core accommodation chamber, set up welding seam, mounting etc. in the outside that electric core accommodation chamber and range upon range of electric core accommodation chamber, perhaps along electric core accommodation frame 2's width direction's both ends department.

According to another aspect of the present invention, there is provided a battery pack, see fig. 1 and 2, the battery pack being provided with: the lower case of the battery pack according to the above; the battery cell module 8, the battery cell module 8 includes a plurality of battery cells 81, the plurality of battery cells 81 are stacked in the thickness direction of the battery cells 81, the battery cell module 8 is installed in the battery cell accommodating cavity, and the battery cell accommodating frame 2 applies a pressing force along the thickness direction of the battery cells 81 to the battery cell module 8; and the battery cell upper cover 3 covers the upper side of the battery cell module 8 and is fixed on the lower shell of the battery pack.

The battery pack has the advantages that the battery pack is similar to the lower shell of the battery pack, and the battery core 82 can be directly placed in the lower shell of the battery pack, so that the energy density of the battery pack is improved.

The unable compression of width of electric core module 8, therefore the width that the chamber was held to electric core needs slightly to be greater than the width of electric core module 8, make electric core module 8 can put electric core smoothly and hold the intracavity, for making the stable fixing of electric core module 8 hold the intracavity at electric core, can set up suitable limit structure between curb plate 22 and electric core module 8 or set up curb plate 22 as adjustable in order to compress tightly electric core module 8, however, this casing structure under can making the battery package is complicated. Preferably, electric core module 8 with be formed with the encapsulating fixed part between the lower casing of battery package, the encapsulating fixed part can be with electric core module 8 stable, reliable keeping in suitable position, and simple structure, and the assembly is simple and convenient, only need place electric core with electric core module 8 and hold the intracavity after, hold the intracavity to the battery and the encapsulating can.

Further, the battery pack comprises a limiting pressing strip 4 fixedly installed on a lower shell of the battery pack and extending along the thickness direction of the battery core 81, wherein the limiting pressing strip 4 comprises an upper cover fixing part 43 and a battery core limiting part 44, the upper cover fixing part 43 is in crimping connection with one side, away from the battery core module 8, of the battery core upper cover 3, so that the battery core upper cover 3 is fixed on the lower shell of the battery pack, and the battery core limiting part 44 is inserted between the battery core module 8 and the battery core containing frame 2, so that a proper distance is kept between the battery core module 8 and the battery core containing frame 2.

The structure, number and arrangement of the limiting pressing strips 4 can be selected appropriately according to actual needs, for example, limiting lines are uniformly distributed around the cell module 8, and the limiting pressing strips are arranged on only one side of the cell module 8. Referring to fig. 5 and 6, the limiting pressing strips 4 are preferably made of an insulating material, and the limiting pressing strips 4 are disposed between the side plates 22 and the cell modules 8 and between the middle partition plate 23 and the cell modules 8, so that gaps are formed between the cell modules 8 and the side plates 22, and an insulating protection effect is achieved.

The assembling mode of the limiting pressing strip 4 is described in brief by combining fig. 5 and fig. 6, the cell module 8 can be extruded when the limiting pressing strip 4 is installed, and since the glue filling fixing part is formed between the cell module 8 and the cell containing frame 2, the limiting pressing strip needs to be installed when the glue filling is completed and the glue filling fixing part is not completely cured, and the cell module 8 corrects the position under the extrusion of the cell limiting part 44 of the limiting pressing strip 4, so that the two sides of the cell module 8 keep proper intervals with the side plates 22. The edge of the battery core upper cover 3 is compressed tightly at the lower shell of the battery pack by the upper cover fixing part 43 of the limiting pressing strip 4, and is fixedly installed at the battery core accommodating frame 7 through the fastening bolt 7. In addition, the limiting pressing strip 4 can play a role in fixing the battery cell module, and limits the movement of the battery cell module 8 along the width direction and the length direction of the battery cell.

The specific structure of the limiting pressing strip 4 can be selected appropriately according to actual needs, and the upper cover fixing part 43 and the battery cell limiting part 44 can respectively realize the functions of fixing the battery cell upper cover 3 and the limiting battery cell module 8. Referring to fig. 14 and 15, the limiting bead is formed into a T-shaped structure, which has a transverse portion serving as the upper cover fixing portion 43 and a longitudinal portion serving as the cell limiting portion 44, and is formed with an inclined guide structure 45 at an end thereof away from the transverse portion, and is simple in structure and easy to assemble. In addition, the specific structure of the limiting pressing strip 4 can be appropriately modified according to actual conditions, for example, the edge limiting pressing strip 41 arranged between the cell module 8 and the side plate 22 is formed into a regular T-shaped structure, the middle limiting pressing strip 42 arranged between the cell module 8 and the middle partition plate 23 integrates two T-shaped structures, and the two T-shaped structures are arranged side by side to form a pi-shaped structure, so that the assembly of the battery pack is facilitated.

Preferably, the battery cell module 8 includes a heating sheet 82 and a plurality of battery cells 81 stacked in a length direction of the battery cell module 8, and the heating sheet 82 is adhered to the battery cells 81 and can transfer heat to the battery cells 81. The heating sheet 82 can transmit heat to the battery core 81, so that the battery module 8 can still normally work in a low-temperature environment (for example, in winter or in a high-altitude area), the heating sheet 82 is adhered to the battery module 8, the heating sheet 82 is not required to be arranged independently, so that the structure of the battery module 8 is more compact, the battery module 8 and a battery pack can be conveniently assembled, in addition, the heating sheet is directly adhered to the battery core, so that the combination of the heating sheet and the battery core is more compact, and the heat transfer efficiency is improved.

The heater chip wire bundle 821 of the heater chip 82 is led out from the outlet opening 221 of the side plate 22 and connected to a power supply.

The heating sheet 82 may be adhered to the cell module 8 in any suitable manner, and preferably, the heating sheet 82 is adhered to the cell module 8 by a heat-conducting structural adhesive, so as to improve the heat transfer efficiency between the heating sheet 82 and the cell module 8. The heating mold 82 may be formed as a single body or assembled by a plurality of parts, preferably as a single body, so as to facilitate the adhering arrangement of the heating sheet 82, and the heating sheet 82 is preferably a flexible film composed of a heating wire and plastic coated outside the heating wire so as to facilitate the arrangement of the heating sheet 82 and reduce the required arrangement space.

Referring to fig. 2, the cell module 8 includes four side surfaces extending along a length direction of the cell module 8, the heating sheet 82 is disposed on at least one of the side surfaces, and the heating sheet 82 is adhered to each of the cells 81, so as to transfer heat to each of the cells 81.

The number of the heating sheets 82 may be appropriately selected according to the actually required heat transfer efficiency, for example, the heating sheets are disposed on four sides or even two end surfaces of the cell module 8, but since the top of the cell module is provided with the electric connection terminals, it is difficult to attach the heating sheets. Referring to fig. 2, the heating sheet 82 includes a first heating sheet and a second heating sheet respectively adhered to two opposite sides of the cell module 8, so as to improve the heating efficiency of the cell module 8 and facilitate the manufacture of the cell module 8.

Preferably, an insulating buffer (not shown) is disposed between the adjacent battery cells 81 to improve the insulating performance of the battery cell module 8 and avoid collision between the adjacent battery cells 81. In addition, insulating blotter can also provide certain flexible volume for electric core module 8 to be convenient for assemble electric core after electric core module 8 is compressed by anchor clamps and hold the intracavity to electric core.

The structure of the laminated cell module 9 may be the same as that of the cell module 8, or may be other suitable structures according to the use requirements.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a lower casing of battery package, its characterized in that, lower casing of battery package includes bottom plate (1) and is fixed in the electric core of bottom plate (1) holds frame (2), bottom plate (1) with the electric core holds frame (2) and encloses to close and form electric core and hold the chamber, electric core hold frame (2) can to place in electric core holds electric core (81) in the chamber and play limiting displacement.

2. The lower case of the battery pack according to claim 1, wherein the cell housing frame (2) includes a rectangular outer frame and a partition plate that partitions the cell housing chamber into a plurality of housing chamber components.

3. The lower case of the battery pack according to claim 2, wherein the rectangular outer frame comprises end pressing plates (21) extending along a width direction of the rectangular outer frame and side plates (22) extending along a length direction of the rectangular outer frame, and the partition plate comprises middle pressing plates (24) extending along the width direction of the rectangular outer frame and middle partition plates (23) extending along the length direction of the rectangular outer frame, wherein the end pressing plates (21) and the middle pressing plates (24) can apply pressing force to the battery cells (81) accommodated in the battery cell accommodating cavities.

4. The lower case of a battery pack according to claim 3, wherein the middle pressing plate (24) is formed with a wire harness fixing structure (241) in which,

the wire harness fixing structure (241) is formed as a groove at one end of the middle pressing plate (24) far away from the bottom plate (1), and the wire harness fixing structure (241) is located at the middle position of the middle pressing plate (24) along the thickness direction of the middle pressing plate (24); or

The wire harness fixing structure (241) is formed into a concave structure located at one end of the middle pressing plate (24) far away from the bottom plate (1), and the wire harness fixing structure (241) is located at two ends of the middle pressing plate (24) along the thickness direction of the middle pressing plate (24).

5. The lower casing of the battery pack according to any one of claims 1 to 4, wherein the lower casing of the battery pack comprises a laminated battery cell accommodating bracket (6) arranged on one side of the battery cell accommodating frame (2) far away from the bottom plate (1) in a laminated manner along the thickness direction of the bottom plate (1), an additional battery cell accommodating cavity is formed in the laminated battery cell accommodating bracket (6), and the laminated battery cell accommodating bracket (6) can limit an additional battery cell (91) placed in the additional battery cell accommodating cavity.

6. The lower case of the battery pack according to claim 5,

the laminated battery cell accommodating support (6) comprises a laminated bottom plate (65) and a laminated battery cell accommodating frame fixed on the laminated bottom plate, the laminated bottom plate (65) and the laminated battery cell accommodating frame enclose to form the additional battery cell accommodating cavity, and the laminated battery cell accommodating frame comprises a laminated rectangular outer frame and a laminated partition plate for dividing the laminated battery cell accommodating cavity into a plurality of laminated accommodating cavity components; and/or

The battery cell accommodating frame is provided with a laminated support fixing structure (25), and the laminated battery cell accommodating support (6) is fixedly installed on the laminated support fixing structure (25) through a thread installation piece (7).

7. The lower case of the battery pack according to any one of claims 1 to 4, wherein the lower case of the battery pack comprises at least one of the following three aspects:

firstly, the lower shell of the battery pack comprises a plurality of battery cell accommodating frames (2) fixed on the bottom plate (1);

secondly, the bottom plate (1) is formed into a double-layer plate structure corresponding to the position of the battery cell accommodating frame (2);

and the third type, bottom plate (1) including plate body (11) with set up in boundary beam (12) of the periphery of plate body (11), wherein, boundary beam (12) are including being close to plate body fixed part (122) of plate body (11) and keeping away from periphery reinforcing part (121) of plate body (11), plate body (11) are fixed in plate body fixed part (122), and the electric core holds frame (2) with be formed with the buffering clearance between periphery reinforcing part (121).

8. A battery pack, characterized in that the battery pack is provided with:

the lower case of the battery pack according to any one of claims 1 to 7;

the battery cell module (8), the battery cell module (8) comprises a plurality of battery cells (81), the battery cells (81) are arranged in a stacked manner along the thickness direction of the battery cells (81), the battery cell module (8) is installed in the battery cell accommodating cavity, and the battery cell accommodating frame (2) applies pressing force along the thickness direction of the battery cells (81) to the battery cell module (8);

the battery cell upper cover (3), the battery cell upper cover (3) cover in the upside of battery cell module (8) and be fixed in the lower casing of battery package.

9. The battery pack according to claim 8, wherein a glue fixation part is formed between the cell module (8) and the lower casing of the battery pack.

10. The battery pack according to claim 8 or 9, wherein the battery pack comprises a limiting bead (4) fixedly mounted on a lower housing of the battery pack and extending along a thickness direction of the battery cell (81), wherein the limiting bead (4) comprises an upper cover fixing part (43) and a battery cell limiting part (44), the upper cover fixing part (43) is crimped on one side of the battery cell upper cover (3) far away from the battery cell module (8), and the battery cell limiting part (44) is inserted between the battery cell module (8) and the battery cell accommodating frame (2).