CN114171824A

CN114171824A - Power battery pack and vehicle

Info

Publication number: CN114171824A
Application number: CN202111676215.1A
Authority: CN
Inventors: 童恩东; 周赛军
Original assignee: Anhui Tatfook Technology Co Ltd
Current assignee: Shenzhen Dafu New Energy Co ltd
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2022-03-11

Abstract

The invention relates to the technical field of batteries, and provides a power battery pack and vehicles, wherein the power battery pack comprises a battery pack shell and a plurality of battery cores, the battery pack shell is internally provided with an accommodating space, the accommodating space is divided into a battery placing channel and a heat dissipation channel, the battery placing channel and the heat dissipation channel extend along the large surface direction of the battery cores, the two opposite sides of the battery placing channel are respectively provided with the heat dissipation channel, and each battery core is placed in the corresponding battery placing channel. This application forms a plurality of batteries with the accommodation space partition of battery package casing and places passageway and a plurality of heat dissipation channel, and the battery is placed the passageway and is all extended along the big face direction of electric core with heat dissipation channel to, the battery is placed the relative both sides of passageway and all is provided with heat dissipation channel, and like this, the work heat production accessible heat dissipation channel of electric core gives out to the outside of battery package casing. The power battery pack of the application dissipates heat through the heat dissipation channel, reduces the weight of components and circuits of a heat dissipation system, and greatly reduces the whole weight of the power battery pack.

Description

Power battery package and vehicle

Technical Field

The invention relates to the technical field of batteries, and particularly provides a power battery pack and a vehicle.

Background

The battery pack is generally a battery module formed by connecting a plurality of battery cells in series or in parallel. The electric core in the battery package can produce the heat at the discharge in-process, and if these heats can not in time distribute, can influence the normal use of battery package, weaken the discharge capacity of battery package, shorten the life-span of battery package, can cause the incident even.

For a battery pack, a heat dissipation system needs to be added to the battery pack if the battery pack is required to have good heat dissipation performance. However, the components and circuits of the heat dissipation system occupy a part of the space of the battery pack, which increases the overall weight of the battery pack, and the heat dissipation system has a complicated control method and is expensive to add.

Disclosure of Invention

An object of the embodiment of the present application is to provide a power battery pack, which aims to solve the problem that the overall weight of the battery pack is heavy.

In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions:

in a first aspect, an embodiment of the present application provides a power battery pack, including a battery pack case and a plurality of electric cores, an accommodating space is provided in the battery pack case, the accommodating space is partitioned to form along the orientation the battery that the large face direction of electric core extends places passageway and heat dissipation channel, and, the relative both sides that the passageway was placed to the battery all are provided with heat dissipation channel, each electric core is arranged in and is corresponded in the battery places the passageway.

The beneficial effects of the embodiment of the application are as follows: the application provides a power battery package separates the accommodation space of battery package casing and forms a plurality of batteries and places passageway and a plurality of heat dissipation channel, and the battery is placed the passageway and is all extended along the big face direction of electric core with heat dissipation channel to, the battery is placed the relative both sides of passageway and all is provided with heat dissipation channel, and like this, the work heat production accessible heat dissipation channel of electric core scatters to the outside of battery package casing. The power battery pack of the application dissipates heat through the heat dissipation channel, reduces the weight of components and circuits of a heat dissipation system, and greatly reduces the whole weight of the power battery pack.

In one embodiment, the battery placement channels and the heat dissipation channels are alternately spaced in a faceted direction toward the battery.

In one embodiment, the bottom of the battery pack shell is further provided with an anti-collision bulge, and the anti-collision bulge corresponds to the battery placing channel.

In one embodiment, the power battery pack further comprises two outgoing lines respectively connected to the total positive electrode of each battery cell and the total negative electrode of each battery cell;

the pole lead-out wire comprises a lead body connected with a total positive pole or a total negative pole of each battery cell, an insulating layer coated on the outer side of the lead body and a sleeve piece which is arranged on the battery pack shell and used for limiting the insulating layer.

In one embodiment, the battery can shell comprises at least two connected sub-shells and a nut support structure arranged at the joint of the two sub-shells, and the sub-shells are provided with first connecting holes communicated with the nut support structure.

In one embodiment, the nut support structure comprises a tube body in a hollow structure and a lock nut limited in the tube body, and two open ends of the tube body are respectively communicated with the corresponding first connecting holes.

In one embodiment, a stop part is arranged on the inner wall of the pipe body, and a stop adapting part adapted to the stop part is arranged on the outer wall of the locking nut.

In one embodiment, the stopper is an internally threaded section, the stopper fitting is an externally threaded section, and the lock nut slides between the internally threaded section and the first connection bore.

In one embodiment, an end face of a joint of the two sub-housings is recessed inwards to form a containing groove, the containing groove extends along a large-area direction of the battery cell, and the nut support structure is arranged in the containing groove.

In one embodiment, the battery pack shell comprises at least two connected sub-shells and a nut support structure arranged at the joint of the two sub-shells, the sub-shells are provided with first connecting holes communicated with the nut support structure, and one side of the sub-shells, which is far away from the joint, is provided with second connecting holes.

In a second aspect, the embodiment of the present application further provides a vehicle, which includes the power battery pack described above.

The beneficial effects of the embodiment of the application are as follows: the application provides a vehicle, on the basis that has above-mentioned power battery package, the whole weight of vehicle can be lighter, and the continuation of the journey mileage is farther.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a power battery pack according to an embodiment of the present invention;

FIG. 2 is an enlarged view taken at A in FIG. 1;

fig. 3 is a partial cross-sectional view of a battery pack housing of a power battery pack provided in accordance with an embodiment of the present invention;

fig. 4 is a partial cross-sectional view of a power battery pack provided in accordance with an embodiment of the present invention;

fig. 5 is another partial cross-sectional view of a power battery pack provided in accordance with an embodiment of the present invention;

fig. 6 is a cross-sectional view of a power battery pack according to an embodiment of the present invention;

fig. 7 is an enlarged view at B in fig. 6.

Wherein, in the figures, the respective reference numerals:

100. a power battery pack; 10. a battery pack housing; 20. an electric core; 10a, an accommodating space; 10a1, battery placement channel; 10a2, heat dissipation channel; 30. an anti-collision projection; 40. an outgoing line; 41. a lead body; 42. an insulating layer; 43. a kit; 11. a sub-housing; 12. a nut support structure; 121. a pipe body; 122. locking the nut; 10b, a first connection hole; 1211. a stopper portion; 1221. a stop adapter; 10c, a containing groove; 10d, a second connecting hole; 10e, a liquid injection hole; 50. an explosion-proof valve.

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 "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed 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 two or more unless specifically defined 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 or electrically connected; 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.

Referring to fig. 1 and fig. 3, a power battery pack 100 according to an embodiment of the present disclosure includes a battery pack case 10 and a plurality of battery cells 20. The battery pack case 10 has an accommodating space 10a therein, and the accommodating space 10a is partitioned to form a battery accommodating passage 10a1 and a heat dissipation passage 10a2 extending in a direction toward a large surface of the battery cell 20. Here, as shown in fig. 1, the large-plane direction Y of the cell 20 refers to a cross-sectional direction in which the cross-sectional area of the cell 20 is large, and the small-plane direction X of the cell 20 refers to a cross-sectional direction in which the cross-sectional area of the cell 20 is small. Thus, the area of the battery placing passage 10a1 adjacent to the heat dissipation passage 10a2 is maximized, and the heat dissipation efficiency is maximized.

Moreover, the opposite sides of the battery placing channel 10a1 are provided with heat dissipation channels 10a2, and each battery cell 20 is placed in the corresponding battery placing channel 10a 1. It is understood that both large end surfaces of the battery placing passage 10a1 can dissipate heat through the heat dissipating passage 10a2, further improving heat dissipation efficiency.

There are various combinations of the battery placing passage 10a1 and the heat dissipation passage 10a2, for example, two battery placing passages 10a1 are adjacent to each other, and one heat dissipation passage 10a2 is provided at each of both end sides of the two battery placing passages 10a1, so that the number of the adjacent battery placing passages 10a1 can be determined according to the specific use requirements. Alternatively, the battery placing passages 10a1 alternate with the heat dissipation passages 10a2, i.e., each battery placing passage 10a1 has two adjacent heat dissipation passages 10a 2. Alternatively, the heat dissipation channels 10a2 adjacent to each battery placing channel 10a1 may be added, such as two heat dissipation channels 10a2 disposed on opposite sides of the battery placing channel 10a 1.

The power battery pack 100 provided by the present application separates the accommodating space 10a of the battery pack housing 10 to form a plurality of battery accommodating channels 10a1 and a plurality of heat dissipation channels 10a 2. The battery placing passage 10a1 and the heat dissipation passage 10a2 both extend in the large-area direction of the battery cell 20, and the heat dissipation passages 10a2 are provided on opposite sides of the battery placing passage 10a1, so that heat generated by the operation of the battery cell 20 can be dissipated to the outside of the battery pack case 10 through the heat dissipation passages 10a 2. The power battery pack 100 of the present application dissipates heat through the heat dissipation channel 10a2, reducing the weight of the components and lines of the heat dissipation system, and greatly reducing the overall weight of the power battery pack 100.

Referring to fig. 1, in an embodiment, the battery pack case 10 is provided with a liquid injection hole 10e communicating with the accommodating space 10a, and the liquid injection hole 10e is communicated with each battery placing passage 10a1 for injecting electrolyte into each battery placing passage 10a1, that is, each battery placing passage 10a1 can be used for placing the battery cell 20 and the electrolyte. Meanwhile, the battery pack case 10 is further provided with an explosion-proof valve 50.

In one embodiment, the battery receiving passages 10a1 are independent, i.e., do not communicate with each other through the battery receiving passages 10a 1. Here, the safety of the battery cell 20 therein can be ensured, and the influence on the adjacent battery cells 20 after thermal runaway occurs is avoided. Meanwhile, the battery placement passage 10a1 may be filled with an electrolyte or a heat transfer medium to help dissipate heat from the tape cell 20.

In one embodiment, at least two heat dissipation channels 10a2 are in communication to achieve uniformity in the operating temperature of each cell 20. For example, the heat dissipation channels 10a2 are sequentially communicated, so that heat generated by the formed battery cell 20 can flow along the inner circulation of the heat dissipation channel 10a2, and the heat dissipation is accelerated.

Specifically, the heat dissipation channels 10a2 are filled with a heat dissipation medium, and the heat dissipation efficiency is improved by the heat dissipation medium. It is understood that the form of the heat-dissipating medium may be gaseous, liquid, and solid. For example, the gaseous heat-dissipating medium is a low-temperature gas, such as carbon dioxide or the like; or the liquid heat dissipation medium is cooling liquid; and the solid dispersion medium is heat-conducting colloid.

Specifically, referring to fig. 3, in one embodiment, the battery placing channels 10a1 and the heat dissipation channels 10a2 are alternately arranged along the facet direction of the battery. It is understood that the heat dissipation channels 10a2 are provided on both large face sides of each battery placing channel 10a1, further improving the heat dissipation efficiency.

Referring to fig. 3, in one embodiment, the bottom of the battery pack case 10 is further provided with a bump guard 30, and the bump guard 30 corresponds to the battery placing passage 10a 1. As can be appreciated, the bump guard 30 can reduce the impact on the battery cell 20, and improve the safety of the power battery pack 100.

Specifically, the crash lobes 30 have energy absorbing spaces therein, and the energy absorbing spaces of the crash lobes 30 can contract to absorb some of the impact energy when an impact is applied. Or, the energy-absorbing space is filled with energy-absorbing materials, so that the capacity of absorbing external impact is further improved.

The side of the bump guard 30 away from the bottom of the battery pack case 10 may also be connected to the body of the vehicle, so that external impact can be absorbed by the body through the transmission of the bump guard 30.

Referring to fig. 5, in an embodiment, the power battery pack 100 further includes two outgoing lines 40 respectively connected to the total positive electrode of each battery cell 20 and the total negative electrode of each battery cell 20. It can be understood that the battery cells 20 can be connected in series and in parallel by a wire, and the two outermost battery cells 20 are led out of a total positive electrode and a total negative electrode, so that one of the leading lines 40 is connected with the total positive electrode, and the other leading line 40 is connected with the total negative electrode, thereby realizing the output of electric energy.

Specifically, the lead wire 40 includes a lead body 41 connected to the total positive electrode or the total negative electrode of each of the battery cells 20, an insulating layer 42 covering the outer side of the lead body 41, and a sheath 43 attached to the battery pack case 10. Here, the sleeve 43 may be made of metal, and is mounted on the battery pack case 10 to limit and fix the lead body 41.

Referring to fig. 1, fig. 3, fig. 4 and fig. 6, in an embodiment, the battery pack case 10 includes at least two sub cases 11 connected to each other and a nut support structure 12 disposed at a connection position of the two sub cases 11, and the sub case 11 is provided with a first connection hole 10b communicating with the nut support structure 12. It can be understood that the battery pack case 10 can be formed by assembling at least two sub-cases 11, and a nut support structure 12 is disposed at the joint of the two sub-cases, so as to increase the connection position on the battery pack case 10, and facilitate the penetration of screws into the nut support structure 12 for connection and fixation. Of course, the first connection hole 10b may be opened on the outer peripheral side of the sub-housing 11 for use in connection with a vehicle or the like.

Referring to fig. 7, in an embodiment, the nut support structure 12 includes a tube 121 having a hollow structure and a lock nut 122 limited in the tube 121, and two open ends of the tube 121 are respectively communicated with the corresponding first connection holes 10 b. It will be understood that the screw can penetrate through the first connection hole 10b and enter the tube body 121 from the open end of the tube body 121 to be connected with the lock nut 122. Here, the lock nut 122 has threads therein for connection with a screw.

Specifically, a stopper 1211 is disposed on an inner wall of the tube body 121, and a stopper fitting portion 1221 fitted to the stopper 1211 is disposed on an outer wall of the lock nut 122. It will be appreciated that the lock nut 122 is adapted to the stopper 1211 in the tube body 121 by the stopper fitting portion 1221, and is maintained relatively still with respect to the tube body 121 for screw coupling.

Illustratively, the stopper 1211 is a rib provided on an inner wall of the tube body 121, and the stopper fitting 1221 is a groove opened on an outer wall of the lock nut 122, and when the rib is inserted into the groove, the rotation of the lock nut 122 is restricted. Here, once the rib and the groove are matched, the rib and the groove are hard to separate, and at this time, the lock nut 122 is permanently limited in the tube 121.

Or, for example, the stopper 1211 is an anti-slip layer disposed on the inner wall of the tube body 121, and the stopper fitting 1221 is a glue layer disposed on the outer wall of the lock nut 122, and the rotation of the lock nut 122 is limited by using the characteristic of a large friction force between the glue layer and the anti-slip layer. Here, the locking nut 122 and the tube body 121 are relatively movable, and the adhesive layer has a deformability to facilitate the locking nut 122 to be pushed out from the tube body 121, thereby facilitating maintenance and replacement of the locking nut 122.

Specifically, referring to fig. 7, in one embodiment, the stop 1211 is an internal thread section, the stop adaptor 1221 is an external thread section, and the lock nut 122 slides between the internal thread section and the first connection hole 10 b. It can be understood that the purpose of limiting and preventing rotation is achieved by the thread fit between the lock nut 122 and the tube body 121, and the lock nut 122 can slide between the internal thread section and the first connection hole 10b, which means that the inner wall of the tube body 121 is provided with an internal thread only by one section, so that when the lock nut 122 needs to be pushed out from the tube body 121, the lock nut 122 is driven by the screw to rotate, and the external thread of the lock nut 122 is disengaged from the internal thread of the tube body 121.

Referring to fig. 3 and 7, in an embodiment, an end surface of a connection portion of the two sub-housings 11 is recessed to form a receiving groove 10c, the receiving groove 10c extends along a large-area direction of the electrical core 20, and the nut support structure 12 is disposed in the receiving groove 10 c. It is to be understood that the connection manner of the two sub-housings 11 is not limited, and for example, the connection may be made by welding, screwing, or the like. In order to further reduce the weight of the power battery pack 100, an accommodating groove 10c is formed in the end surface of each of the two sub-housings 11, and the accommodating groove 10c may extend from one end to the other end of the sub-housing 11 along the large-area direction of the battery cell 20, so as to form a through groove, so as to obtain a larger weight reduction, or extend only the width of one nut support structure 12 along the large-area direction of the battery cell 20, so as to be able to place the next nut support structure 12.

For example, in the actual manufacturing process, the accommodating groove 10c may be selectively formed on the end surface of one sub-housing 11, and the accommodating groove 10c may not be formed on the end surface of the other sub-housing 11 connected thereto, so that when the two end surfaces are butted, the inner wall of the accommodating groove 10c and the other end surface enclose a space for accommodating the nut holder structure 12.

Alternatively, the end surface of one sub-housing 11 may be provided with an accommodating groove 10c, and the end surface of the other sub-housing 11 may also be provided with an accommodating groove 10c at an opposite position, so that when the two end surfaces are butted, the inner walls of the two accommodating grooves 10c enclose a space for accommodating the nut support structure 12.

Specifically, the connection mode of the nut support structure 12 and the inner wall of the receiving groove 10c is not limited to welding connection, but may also be other connection modes.

Referring to fig. 1, in an embodiment, a battery pack case 10 includes at least two sub cases 11 connected to each other and a nut support structure 12 disposed at a connection position of the two sub cases 11, the sub cases 11 are formed with a first connection hole 10b communicating with the nut support structure 12, and one side of the sub cases 11 away from the connection position is formed with a second connection hole 10 d. It is understood that the first connection hole 10b and/or the second connection hole 10d may be selected when the peripheral device is connected to the battery pack case. Meanwhile, since the second connection hole 10d is located outside the two connected sub-cases 11, the second connection hole 10d is more suitable for fixing the whole battery pack case 10, for example, by inserting a screw through the second connection hole 10d to connect with a vehicle or the like, so that the connection strength of the whole power battery pack 100 can be improved.

Preferably, referring to fig. 2, an installation groove is formed on an end surface of the sub-housing 11, and at least one nut support structure 12 is disposed in the installation groove, each nut support structure 12 corresponds to the second connection hole 10d, and then the opening of the installation groove is welded and sealed.

The power battery package of this application is through the integrated design, and each functional structure all sets up on the battery package promptly, forms a whole, simple structure, and system control is simple, and bulk strength is high, and is with low costs.

In a second aspect, the embodiment of the present application further provides a vehicle, which includes the power battery pack 100 described above.

The vehicle provided by the application has the power battery pack 100, so that the overall weight of the vehicle can be lighter, and the driving range is longer.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A power battery pack, characterized in that it comprises a battery pack casing and a plurality of battery cells, the battery pack casing has an accommodating space, and the accommodating space is separated and formed along a large surface facing the battery cells. A battery placement channel and a heat dissipation channel extending in the direction are provided, and the heat dissipation channels are provided on opposite sides of the battery placement channel, and each of the battery cells is placed in the corresponding battery placement channel.

2 . The power battery pack according to claim 1 , wherein the battery placement channel and the heat dissipation channel are arranged alternately and at intervals along the facet direction toward the battery. 3 .

3 . The power battery pack according to claim 1 or 2 , wherein the bottom of the battery pack casing is further provided with an anti-collision protrusion, and the anti-collision protrusion is in contact with the battery placement channel. 4 . correspond.

4 . The power battery pack according to claim 1 , wherein the power battery pack further comprises two lead wires respectively connected to the total positive electrode of each of the battery cells and the total negative electrode of each of the battery cells; 5 .

Wherein, the lead wire includes a lead body connected to the total positive electrode or total negative electrode of each of the battery cells, an insulating layer covering the outer side of the lead body, and a lead body mounted on the battery pack case and used for limiting Kit for biting the insulating layer.

5 . The power battery pack according to claim 1 , wherein the battery pack casing comprises at least two connected sub-casings and a nut holder structure provided at the connection between the two sub-casings. 6 . , the sub-shell is provided with a first connection hole that communicates with the nut holder structure.

6 . The power battery pack according to claim 5 , wherein the nut holder structure comprises a hollow tube body and a locking nut limited in the tube body, and two open ends of the tube body They are respectively connected to the corresponding first connection holes.

7 . The power battery pack according to claim 6 , wherein the inner wall of the tube body is provided with a stopper, and the outer wall of the locking nut is provided with a stopper adapted to the stopper. 8 . Stop adapter.

8 . The power battery pack according to claim 6 , wherein the stopper part is an inner thread segment, the stopper fitting part is an outer thread segment, and the locking nut is inside the inner thread segment. 9 . The threaded segment slides with the first connection hole.

9 . The power battery pack according to claim 5 , wherein the end faces where the two sub-shells are connected are concave to form an accommodating groove, and the accommodating groove is along the direction of the large surface of the battery cell. 10 . extension, and the nut holder structure is arranged in the accommodating groove.

10 . The power battery pack according to claim 1 , wherein the battery pack casing comprises at least two connected sub-casings and a nut provided at the connection between the two sub-casings. 11 . A support structure, the sub-shell is provided with a first connection hole communicating with the nut support structure, and a second connection hole is provided on the side of the sub-shell away from the connection.

11. A vehicle characterized by: comprising. The power battery pack according to any one of claims 1 to 10 is included.