CN215933727U

CN215933727U - Lithium ion battery pack

Info

Publication number: CN215933727U
Application number: CN202022345495.5U
Authority: CN
Inventors: 刘士杰
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-10-20
Filing date: 2020-10-20
Publication date: 2022-03-01
Anticipated expiration: 2030-10-20

Abstract

The utility model provides a lithium ion battery pack, which comprises a shell and an electric core group accommodated in the shell, wherein the electric core group comprises a plurality of lithium ion electric cores which are arranged in a stacked mode, the shell comprises a bottom plate and supporting parts arranged on two opposite sides of the bottom plate, the two supporting parts are used for keeping the lithium ion electric cores between the two supporting parts to be tightly attached, and each supporting part comprises two supporting plates which are fixedly connected at intervals; the lithium ion battery also comprises a water cooling plate which is clamped between the electric core group and the bottom plate, and a filling part which is formed by injection molding and arranged on the shell, wherein the filling part comprises two filling blocks which are arranged in the groove openings, and a connecting block which is connected between the two filling blocks and is attached to the bottom surface of the bottom plate. The lithium ion battery pack is light and convenient, and has a good heat dissipation effect.

Description

Lithium ion battery pack

Technical Field

The utility model relates to the technical field of lithium batteries, in particular to a lithium ion battery pack.

Background

The battery pack is used for accommodating a plurality of battery cells arranged in a stacked manner, in order to make the battery cells arranged in the stacked manner tightly fit, a shell of the battery pack is required to apply pressure to the battery cells, at present, the mode of applying pressure to the battery cells is generally that split structures are arranged on two sides of the battery cells, and the split structures are connected through connecting pieces such as bolts and the like so as to apply pressure for keeping the battery cells tightly fit to the battery cells; or the electric core is accommodated in the aluminum die-cast shell; the defects of the existing battery pack are as follows: in the first structure, the overall weight of the battery pack becomes heavy with the weight of the bolts or the like, while in the second structure, the thickness of the wall portion of the case needs to be increased to provide rigidity to the case, and the weight of the battery pack is still heavy.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention is directed to a lithium ion battery pack, so as to have a better usage effect.

In order to achieve the purpose, the technical scheme of the utility model is realized as follows:

a lithium ion battery pack comprises a shell and an electric core group accommodated in the shell, wherein the electric core group comprises a plurality of lithium ion electric cores which are arranged in a stacked mode, and the shell comprises:

a base plate;

the two support parts are fixedly connected with the bottom plate and respectively positioned on two sides of the stacking direction of the lithium ion battery cell layers, and the two support parts are used for keeping the lithium ion battery cells between the two support parts to be tightly attached; each support part comprises a first support plate attached to one end of the electric core group and a second support plate which is fixedly connected with the first support plate and positioned outside the first support plate, and a notch with a downward opening is formed between the first support plate and the second support plate;

the lithium ion battery pack further includes:

the water cooling plate is clamped between the electric core group and the bottom plate, a cavity is formed in the water cooling plate, and a liquid inlet pipe and a liquid outlet pipe which respectively extend downwards and penetrate through the bottom plate are arranged on the water cooling plate;

filling portion, injection moulding is in on the casing, just filling portion is including being located two intraoral filler block of notch, and connect two between the filler block and with the connecting block of the bottom surface laminating of bottom plate.

Furthermore, an insulating spacer is clamped between two adjacent lithium ion electric cores and used for forming insulation between the two adjacent lithium ion electric cores.

Further, the insulating spacer comprises a heat conduction aluminum plate positioned at the middle part and an insulating soft cushion layer coated on the heat conduction aluminum plate.

Furthermore, the heat conducting aluminum plate is provided with heat exchange ends extending into the cavity, and the cavity is divided into a serpentine cooling passage by each heat exchange end.

Furthermore, a plurality of clamping grooves are formed in the water cooling plate, and the heat conducting aluminum plates can be clamped and fixed in the corresponding clamping grooves in a one-to-one correspondence mode.

Furthermore, clamping plates extending into the cavity are arranged on two opposite sides of each clamping groove respectively, and the distance between the two clamping plates is gradually reduced from top to bottom.

Further, be constructed with the recess on the bottom surface of connecting block, lithium ion battery package is still put including the card and is fixed heat dissipation box in the recess, that have sealed cavity, be equipped with the pump body in the heat dissipation box, the input of the pump body with the fluid-discharge tube intercommunication, the output of the pump body with feed liquor pipe intercommunication is used for constituting the coolant liquid and is in circulation on the water-cooling board.

Furthermore, the cavity comprises a first cavity communicated with the liquid inlet pipe and a second cavity communicated with the liquid discharge pipe, and cooling liquid exchange is carried out between the first cavity and the second cavity through the pump body.

Furthermore, a first interface used for being connected with an external pipeline is arranged on the side wall of the first cavity, and a second interface used for being connected with the external pipeline is arranged on the side wall of the second cavity.

Furthermore, the shell is made of aluminum alloy.

Compared with the prior art, the utility model has the following advantages:

according to the lithium ion battery pack, firstly, the supporting part for keeping the battery core tightly attached is arranged to comprise the first supporting plate and the second supporting plate which are arranged at intervals, and the filling block is injected between the first supporting plate and the second supporting plate.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:

fig. 1 is an isometric view of a lithium-ion battery pack according to an embodiment of the utility model;

FIG. 2 is an exploded view of the housing and filler assembly;

fig. 3 is a schematic diagram of an internal structure of a lithium ion battery pack according to an embodiment of the present invention;

fig. 4 is an exploded view of a lithium ion battery pack according to an embodiment of the present invention;

FIG. 5 is a schematic diagram illustrating a water-cooling plate and a box according to an embodiment of the present invention;

FIG. 6 is a top view of a water cooled panel and an insulating spacer according to an embodiment of the present invention;

FIG. 7 is a cross-sectional view taken at A-A of FIG. 6;

FIG. 8 is an enlarged view at B of FIG. 7;

FIG. 9 is a schematic view of the insulating spacer and the water-cooled plate according to the embodiment of the present invention;

fig. 10 is another perspective view of a lithium ion battery pack according to an embodiment of the utility model.

Description of reference numerals:

1-shell, 11-bottom plate, 12-support part, 13-second wall part, 121-first support plate, 122-second support plate, 123-middle support plate, 101-notch, 2-electric core group, 21-lithium ion electric core, 22-insulating spacer, 221-heat conducting aluminum plate, 222-insulating soft cushion layer, 223-heat exchanging end, 201-notch, 3-filling part, 31-filling block, 32-connecting block, 4-water cooling plate, 41-liquid inlet pipe, 42-liquid outlet pipe, 401-cavity, 402-clamping groove, 43-clamping plate, 5-heat dissipation box, 501-first cavity, 502-second cavity, 51-first interface, 52-second interface and 6-pump body.

Detailed Description

To facilitate an understanding of the utility model, the utility model will now be described more fully with reference to the accompanying drawings. Several embodiments of the utility model are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The present embodiment relates to a lithium ion battery pack, and as shown in fig. 1 to fig. 10, the lithium ion battery pack includes a casing 1, and an electric core group 2 received in the casing 1, wherein the electric core group 2 includes a plurality of lithium ion electric cores 21 arranged in a stacked manner; the shell 1 comprises a bottom plate 11 and two support parts 12, the two support parts 12 are fixedly connected with the bottom plate 11 and respectively positioned at two sides of each lithium ion cell 21 in the stacking direction, and the two support parts 12 are used for keeping each lithium ion cell 21 between the two support parts to be tightly attached; each support part 12 comprises a first support plate 121 attached to one end of the electric core assembly 2, and a second support plate 122 fixedly connected to the first support plate 121 and located outside the first support plate 121, and a notch 101 with a downward opening is formed between the first support plate 121 and the second support plate 122.

The lithium ion battery pack further comprises a water cooling plate 4 clamped between the electric core group 2 and the bottom plate 11, a cavity 401 is formed inside the water cooling plate 4, and a liquid inlet pipe 41 and a liquid outlet pipe 42 which respectively extend downwards and penetrate through the bottom plate 11 are arranged on the water cooling plate 4; the lithium ion battery pack of the present embodiment further includes a filling portion 3, the filling portion 3 is injection-molded on the housing 1, and the filling portion 3 includes filling blocks 31 located in the two notches 101, and a connecting block 32 connected between the two filling blocks 31 and attached to the bottom surface of the bottom plate 11.

In the present embodiment, referring to fig. 1 and 3, the electric core group 2 includes a plurality of square lithium ion electric cores 21 and a plurality of rectangular plate-shaped insulating spacers 22 that are alternately stacked; the square lithium ion battery cells 21 are existing mature products, the structure of which is not described in detail herein, and the insulating spacer 22 is sandwiched between two adjacent lithium ion battery cells 21 to form insulation between the core shells of the two adjacent lithium ion battery cells 21.

Referring to fig. 2, the housing 1 of the present embodiment is in a rectangular parallelepiped shape with an open top, and the housing 1 specifically includes a bottom plate 11 in a rectangular parallelepiped plate shape, and four wall portions extending upward from edges of four sides of the bottom plate 11, two of the wall portions are orthogonal to the stacking direction of the lithium ion electric cells 21, the two wall portions constitute the support portion 12, and the other two wall portions are parallel to the stacking direction of the lithium ion electric cells 21, and hereinafter, the two wall portions parallel to the stacking direction of the lithium ion electric cells 21 are referred to as second wall portions 13.

The two support portions 12 have the same structure, and one of them will be described in the present embodiment; referring to fig. 2, the support part 12 includes a first support plate 121 vertically bent upward from a corresponding side of the base plate 11, a middle support plate 123 vertically bent outward from a top end of the first support plate 121, and a second support plate 122 vertically bent downward from an outer side of the middle support plate 123; each second wall portion 13 comprises a second wall plate bent vertically upward from the corresponding side edge of the bottom plate 11; the second wall plates are not directly connected to the first support plates 121 but are connected by the bottom plate 11.

Referring to fig. 1 and 2, the filling part 3 of the present embodiment is injection molded on the housing 1, and the filling part 3 specifically includes a filling block 31 injection-molded and fixed between the first support plate 121 and the second support plate 122 of each support part 12, and further includes a connecting block 32 connected to the two filling blocks 31 and attached to the bottom surface of the bottom plate 11; preferably, the filling part 3 further comprises a supporting block covering the outer sides of the two second wall plates.

Based on the case 1 and the filling part 3 configured as described above, first, by providing the support part 12 to include the above sandwich structure, a better anti-torsion effect can be obtained; compared with the metal material with the same thickness, the density of the plastic is smaller than that of the metal, so that the shell 1 of the embodiment can meet the strength requirement and is beneficial to light weight of the battery pack.

Due to the adoption of the shell 1 structure, the heat dissipation effect of the battery pack can be affected, and therefore, the embodiment provides the water-cooling heat dissipation structure suitable for the lithium ion battery pack. Referring to fig. 4, a water-cooling plate 4 is sandwiched between a base plate 11 and a core pack 2, the water-cooling plate 4 is fixed on the upper surface of the base plate 11, and a cavity 401 is formed inside the water-cooling plate 4, wherein one of the modes of forming the cavity 401 is: the water-cooling plate 4 comprises an upper plate body and a lower plate body, and the upper plate body and the lower plate body are buckled and fixed to form the sealed cavity 401.

A liquid inlet pipe 41 and a liquid outlet pipe 42 are fixedly arranged on the water cooling plate 4, the liquid inlet pipe 41 and the liquid outlet pipe 42 respectively extend downwards to penetrate through the bottom plate 11, and the filling part 3 is further coated on the peripheries of the liquid inlet pipe 41 and the liquid outlet pipe 42 in an injection molding way; the top end of the liquid inlet pipe 41 is communicated with the cavity 401 in the water-cooling plate 4, the bottom end thereof is communicated with a first cavity 501 described below, the top end of the liquid outlet pipe 42 is communicated with the cavity 401 in the water-cooling plate 4, and the bottom end thereof is communicated with a second cavity 502 described below.

Through set up foretell water-cooling plate 4 between electric core group 2 and bottom plate 11, the produced heat of each electric core can transmit to the coolant liquid of cavity 401 of flowing through to reduce the temperature of electric core, make electric core work at suitable temperature interval, and then the life of extension electric core.

Because the water cooling plate 4 is only contacted with the bottom surface of each battery cell, the heat dissipation of the bottom of the battery cell is faster, the heat dissipation of the top of the battery cell is slower, the heat dissipation of the battery cell may not be timely, the temperature of each battery cell is uneven, and the performance of the battery cell may be influenced to a certain extent. For this reason, in the present embodiment, referring to fig. 6 to 8, the thermal insulation spacer includes a heat conductive aluminum plate 221 located at the middle portion, and an insulating soft cushion layer 222 coated on the heat conductive aluminum plate 221, and the insulating soft cushion layer 222 is made of, for example, a resin material or a silicon rubber having good insulating and heat conductive properties. Through setting up adiabatic spacer into above-mentioned structure, the good heat conductivility of accessible heat conduction aluminum plate 221 makes the temperature everywhere of electric core more even.

In this embodiment, referring to fig. 8 and 9, the heat conductive aluminum plate 221 has a heat exchange end 223 extending into the cavity 401; that is, the bottom end of the heat-conducting aluminum plate 221 can be inserted into the cavity 401 and attached to the bottom wall of the cavity 401, and the insulating soft cushion layer 222 only covers the portion of the heat-conducting aluminum plate 221 above the upper surface of the water-cooling plate 4; insert the cavity 401 through the bottom with each heat conduction aluminum plate 221 in, make heat conduction aluminum plate 221 and coolant liquid direct contact, can improve the heat exchange rate of heat conduction aluminum plate 221 and coolant liquid to more be favorable to the produced thermal effluvium of electric core, the life of extension electric core.

Referring to fig. 8 and 9, wherein, for the convenience of viewing, fig. 9 hides the upper plate body of the water-cooled plate 4, and the first insulating spacer 22 only shows the heat exchange end 223 thereof, and the part thereof above the water-cooled plate 4 is not shown; in the embodiment, in order to have a better use effect, a stopper is arranged in the cavity 401 in advance, two ends of the heat exchanging end 223 are specifically abutted against the stopper, and generally, each heat exchanging end 223 can block the flow of the cooling liquid; each heat conduction aluminum plate 221 divides the cavity 401 into a plurality of strip-shaped chambers, a notch 201 for cooling liquid to flow through is formed in each heat exchange end 223, the notches 201 in two adjacent heat conduction aluminum plates 221 are located on two opposite sides of the water cooling plate 4, so that each heat exchange end 223 divides the cavity 401 into a serpentine cooling channel, the liquid inlet pipe 41 is specifically communicated with the head end of the cooling channel, and the liquid outlet pipe 42 is communicated with the tail end of the cooling channel. Through setting up heat transfer end 223 according to above-mentioned structure, can make coolant liquid fully contact with each heat transfer end 223 to further improve this lithium ion battery package's radiating efficiency.

In this embodiment, a plurality of slots 402 are formed on the water-cooling plate 4, and the heat-conducting aluminum plates 221 can be correspondingly fixed in the slots 402, so that the heat-exchanging end 223 extends into the cavity 401. Referring to fig. 8, the two card boards 43 extend into the cavity 401 on two opposite sides of each card slot 402, and the distance between the two card boards 43 is gradually decreased from the top to the bottom. Through the draw-in groove 402 that sets up above-mentioned structure, can be convenient through insert heat conduction aluminum plate 221 in draw-in groove 402 and constitute the fixed of heat conduction aluminum plate 221 on water-cooling plate 4, and through the cardboard 43 that sets up above-mentioned structure, can press from both sides tight heat conduction aluminum plate 221 by two cardboard 43, avoid the coolant liquid to spill over.

In this embodiment, a groove is formed on the bottom surface of the connecting block 32, and the lithium ion battery pack of this embodiment further includes a heat dissipation box 5 that is fixed in the groove in a clamping manner. Referring to fig. 5 and 10, a sealed chamber is arranged in the heat dissipation box 5, a pump body 6 is arranged in the heat dissipation box 5, an input end of the pump body 6 is communicated with the liquid discharge pipe 42, and an output end of the pump body 6 is communicated with the liquid inlet pipe 41, so that the pump body 6 can form a circulating circulation of cooling liquid on the water cooling plate 4; preferably, the heat dissipation box 5 is made of a metal material with good heat conductivity, so as to facilitate heat dissipation. In this embodiment, the heat dissipation case 5 is provided, whereby the heat dissipation effect of each lithium ion cell 21 can be further improved.

In this embodiment, the above-mentioned chambers specifically include a first chamber 501 communicated with the liquid inlet pipe 41 and a second chamber 502 communicated with the liquid outlet pipe 42, and the first chamber 501 and the second chamber 502 exchange cooling liquid through the pump body 6, that is, the pump body 6 can pump the cooling liquid in the second chamber 502 into the first chamber 501, so as to form a circulation of the cooling liquid in the water-cooling plate 4.

In this embodiment, a first interface 51 for connecting an external pipeline is disposed on a side wall of the first cavity 501, specifically, a bottom wall of the first cavity 501, and a second interface 52 for connecting an external pipeline is disposed on a side wall of the second cavity 502, specifically, a bottom wall of the second cavity 502.

By setting the first interface 51 and the second interface 52, the cooling paths between the lithium ion battery packs of the multiple embodiments can be connected in series, so as to control the temperatures of the lithium ion battery packs of the multiple embodiments at the same time, it should be noted that the specific control manner may refer to the existing mature technology, which is not described herein again, and it should also be noted that if the multiple battery packs do not need to be controlled at the same time, the first interface 51 and the second interface 52 may not be set.

In the lithium ion battery pack of this embodiment, first, the support portion 12 for keeping the battery core tightly attached is set to include the first support plate 121 and the second support plate 122 which are arranged at intervals, and the filling block 31 is injection-molded between the first support plate 121 and the second support plate 122, because the casing 1 is usually made of metal, and the density of the injection-molded filling block 31 is smaller than that of the casing 1, the lithium ion battery pack of this embodiment can satisfy the required strength and have a light weight; secondly, through setting up water-cooling plate 4 according to above-mentioned structure between electric core group 2 and bottom plate 11, can have better cooling effect to electric core group 2, prolong the life of this lithium ion battery package.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the present invention, and any modifications, equivalents, 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. A lithium ion battery pack comprises a shell and an electric core group accommodated in the shell, wherein the electric core group comprises a plurality of lithium ion electric cores which are arranged in a stacked mode, and the shell is characterized by comprising:

a base plate;

the lithium ion battery pack further includes:

2. The lithium ion battery pack of claim 1, wherein: an insulating spacer is clamped between two adjacent lithium ion electric cores and used for forming insulation between the two adjacent lithium ion electric cores.

3. The lithium ion battery pack of claim 2, wherein: the insulating spacer comprises a heat-conducting aluminum plate positioned at the middle part and an insulating soft cushion layer coated on the heat-conducting aluminum plate.

4. The lithium ion battery pack of claim 3, wherein: the heat conducting aluminum plate is provided with heat exchange ends extending into the cavity, and the cavity is divided into a snake-shaped cooling passage by each heat exchange end.

5. The lithium ion battery pack of claim 4, wherein: a plurality of clamping grooves are formed in the water cooling plate, and the heat conducting aluminum plates can be clamped and fixed in the corresponding clamping grooves in a one-to-one correspondence mode.

6. The lithium ion battery pack of claim 5, wherein: the clamping plates extending into the cavity are arranged on two opposite sides of each clamping groove respectively, and the distance between the two clamping plates is gradually reduced from top to bottom.

7. The lithium ion battery pack of claim 1, wherein: the lithium ion battery pack is characterized in that a groove is formed in the bottom surface of the connecting block, the lithium ion battery pack further comprises a heat dissipation box which is clamped and fixed in the groove and provided with a sealed cavity, a pump body is arranged in the heat dissipation box, the input end of the pump body is communicated with the liquid discharge pipe, and the output end of the pump body is communicated with the liquid inlet pipe and used for forming circulation of cooling liquid on the water cooling plate.

8. The lithium ion battery pack of claim 7, wherein: the cavity comprises a first cavity communicated with the liquid inlet pipe and a second cavity communicated with the liquid discharge pipe, and cooling liquid exchange is carried out between the first cavity and the second cavity through the pump body.

9. The lithium ion battery pack of claim 8, wherein: the side wall of the first cavity is provided with a first interface used for being connected with an external pipeline, and the side wall of the second cavity is provided with a second interface used for being connected with the external pipeline.

10. The lithium ion battery pack of any one of claims 1 to 9, wherein: the shell is made of aluminum alloy.