CN218919154U

CN218919154U - Battery pack and vehicle

Info

Publication number: CN218919154U
Application number: CN202223155269.6U
Authority: CN
Inventors: 成传胜; 曲凡多; 赵亮
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2022-11-25
Filing date: 2022-11-25
Publication date: 2023-04-25
Anticipated expiration: 2032-11-25

Abstract

The embodiment of the application discloses battery package and vehicle, the battery package is established first apron through the first opening cover at the framework, first apron and the bottom surface adhesive coupling of electric core, in order to guarantee the stability of electric core module installation in the framework, set up the guard plate in first apron face that deviates from electric core module, set up the bellying on the guard plate, form several style of calligraphy structures, can provide the amortization of high strength deformation and power when the battery package bottom receives external impact, thereby realize carrying out safety protection to the bottom of whole electric core module, can also provide supporting role for the rigidity of whole battery package simultaneously, vibration performance and bottom protection performance etc. of whole battery package have great improvement, need not to set up longeron and crossbeam in the framework, space utilization in the framework has been promoted, overall structure weight is lighter relatively, low in manufacturing cost, manufacturing process is simple, can greatly shorten battery package performance verification cycle, the duration of promoting the battery package.

Description

Battery pack and vehicle

Technical Field

The application relates to the technical field of batteries, in particular to a battery pack and a vehicle.

Background

In order to improve the capability of the battery pack to cope with various working conditions, the structural strength of the battery pack must be improved, and the design mode of the battery pack structure directly affects the overall safety performance of the battery pack. With the attention of safety performance and energy, the safety performance of the battery pack is increasingly important; with the development of new technology and new technology, the structure forms of the battery pack are also diversified; and with the continuous improvement of the energy density of the battery pack, the high-integration battery pack structure is particularly important.

In the existing battery pack, a plurality of cross beams and longitudinal beams are arranged in a lower shell of the battery pack, and although the overall strength of the battery pack can be guaranteed, excessive space in the lower shell can be occupied, so that the number of battery core modules which can be loaded in the lower shell is limited, the energy density of the battery pack is low, the cruising ability of the battery pack is poor, the cross beams and the longitudinal beams are increased, the overall weight of the battery pack can be increased, and the manufacturing cost is high.

In addition, the arrangement form of the battery core in the battery module in the current battery pack basically is that the pole of the battery core is upward, the explosion-proof valve is upward (namely, the pole and the explosion-proof valve are arranged on the top surface of the battery core), or the pole of the battery core faces one side or two sides, and the explosion-proof valve and the pole are on the same side (namely, the pole and the explosion-proof valve are arranged on the side surface of the battery), and the arrangement modes of the two battery cores are relatively common, but are not perfect in the aspects of improving the energy density of the whole battery pack, improving the thermal runaway of the battery core and the like.

Disclosure of Invention

The embodiment of the application provides a battery pack and a vehicle, which can solve the problems of low battery pack energy density and poor battery pack endurance due to the design of a cross beam and a longitudinal beam in the existing battery pack.

An embodiment of the present application provides a battery pack, including: a frame body provided with a first opening and a second opening which are oppositely arranged; the battery cell module is arranged in the frame body and comprises at least two battery cells stacked along a first direction, the battery cells are provided with a top surface and a bottom surface which are oppositely arranged, and the bottom surface of each battery cell faces to the first opening; the first cover plate is covered on the first opening and is fixedly connected with the bottom surface of the battery cell; the protection plate is arranged on one surface, away from the cell module, of the first cover plate and is fixedly connected with the first cover plate; the protection plate is provided with at least one protruding portion, the protruding portion protrudes towards the direction away from the first cover plate, and the protruding portion extends along the first direction.

Optionally, the device further comprises at least one buffer member, which is arranged between the protection plate and the first cover plate, and extends along the first direction; the bulge is in the guard plate is towards first apron one side is limited and is held the chamber, the buffer is inlayed and is located in this holds the chamber, the buffer with first apron laminating mutually.

Optionally, the battery cell module further comprises at least one support piece, wherein the support piece extends along the first direction, the support piece is arranged between the battery cell module and the first cover plate, and the support piece is connected with the bottom surface of the battery cell in an adhesive manner; or, the support member is disposed between the first cover plate and the protection plate.

Optionally, the support has a hollow structure.

Optionally, an explosion-proof valve is arranged on the bottom surface of each cell; and the first cover plate is provided with a pressure relief opening which is opposite to the explosion-proof valve.

Optionally, the guard plate orientation first apron one side has seted up the pressure release groove, the pressure release groove with the pressure release mouth sets up relatively, the pressure release groove is followed first direction extends, the pressure release groove is followed the both ends that the first direction set up relatively link up respectively the guard plate, in order to form the pressure release passageway on the guard plate.

Optionally, the protection plate is connected with the first cover plate in an adhesive manner through at least two bonding pieces, the bonding pieces extend along the first direction, the at least two bonding pieces and the protruding portion are arranged at intervals along the second direction, and the second direction is perpendicular to the first direction.

Optionally, two opposite ends of the first cover plate in the first direction are respectively and fixedly connected with the frame body.

Optionally, the battery cell also comprises a second cover plate, wherein the second cover plate is covered on the second opening, and the second cover plate is connected with the top surface of the battery cell in an adhesive manner.

Meanwhile, the embodiment of the application also provides a vehicle which comprises the battery pack.

The beneficial effects of this application lie in, provide a battery package and have vehicle of this battery package, the battery package is through establishing first apron at the first opening lid of framework, the bottom surface adhesive bond of first apron and electric core, in order to guarantee the stability of electric core module installation in the framework, it sets up the guard plate to deviate from electric core module one side at first apron, set up the bellying on the guard plate, form several style of calligraphy structures, can provide the amortization of high strength when the battery package bottom receives external impact, thereby realize carrying out safety protection to the bottom of whole electric core module, still can provide supporting role for the rigidity of whole battery package simultaneously, vibration performance and bottom protective properties etc. of whole battery package have great improvement, need not to set up longeron and crossbeam in the framework, space utilization in the framework has been promoted, overall structure weight is lighter relatively, low in manufacturing cost, manufacturing process is simple, can greatly shorten battery package performance verification period, the duration of battery package is promoted.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic view of a first angle of a battery pack according to an embodiment of the present disclosure;

fig. 2 is a schematic view of a second angle of a battery pack according to an embodiment of the present disclosure;

FIG. 3 is an enlarged schematic view of the structure at A of FIG. 2;

fig. 4 is a schematic structural view of a support member in a battery pack according to an embodiment of the present application;

fig. 5 is a schematic diagram of a combined structure of a battery cell, a first cover plate, an adhesive member, a buffer member, a supporting member and a protection plate in a battery pack according to an embodiment of the disclosure;

fig. 6 is a schematic view showing a combined structure of a first cover plate, an adhesive member, a buffer member, a supporting member and a protection plate in a battery pack according to an embodiment of the present disclosure;

FIG. 7 is an enlarged schematic view of the structure at B of FIG. 6;

fig. 8 is a schematic structural view of a battery pack according to another embodiment of the present application.

Reference numerals illustrate:

100. the battery pack comprises a battery pack, 110, a frame body, 111, a first opening, 112, a second opening, 113, a pressure relief piece, 114, a wing piece, 120, a battery cell module, 121, a battery cell, 1211, an adhesive layer, 1212, a pole, 130, a first cover plate, 131, a pressure relief opening, 132, a first flow channel, 140, a protection plate, 141, a boss, 142, a pressure relief groove, 1421, a pressure relief channel, 143, an adhesive piece, 150, a buffer piece, 160, a support piece, 160a, a first support piece, 160b, a second support piece, 160c, a third support piece, 161, an adhesive part, 162, a hollow part, 170 and a second cover plate;

x, first direction, Y, second direction.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application. Furthermore, it should be understood that the detailed description is presented herein for purposes of illustration and explanation only and is not intended to limit the present application. In this application, unless otherwise indicated, terms of orientation such as "upper" and "lower" are used to generally refer to the upper and lower positions of the device in actual use or operation, and specifically the orientation of the drawing figures; while "inner" and "outer" are for the outline of the device. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features.

The embodiment of the application provides a battery pack, have vehicle of this battery pack, the battery pack is through establishing first apron at the first opening cover of framework, first apron and the bottom surface adhesive coupling of electric core, so as to guarantee the stability of electric core module installation in the framework, set up the guard plate in first apron face that deviates from electric core module, set up the bellying on the guard plate, form several style of calligraphy structures, can provide the amortization of high strength deformation and power when the battery pack bottom receives external impact, thereby realize carrying out safety protection to the bottom of whole electric core module, still can provide supporting role for the rigidity of whole battery pack simultaneously, vibration performance and bottom barrier propterty etc. of whole battery pack have great improvement, need not to set up longeron and crossbeam in the framework, space utilization in the framework has been promoted, overall structure weight is lighter relatively, low in manufacturing cost, manufacturing process is simple, can greatly shorten battery pack performance verification cycle, the duration of battery pack is promoted. As a typical application, the battery pack may be applied to an electric vehicle to supply electric power to the electric vehicle.

In an embodiment of the present application, a battery pack is provided, and referring to fig. 1 to 8, a battery pack 100 includes: the battery cell module 120, the first cover plate 130, and the shielding plate 140.

Referring to fig. 1 and 2, the frame 110 is formed by four frames (not shown) circumferentially, the frame 110 has a first opening 111 and a second opening 112 which are oppositely disposed, and a pressure release member 113 communicating with the inside of the frame 110 is disposed on one frame of the frame 110. The cell module 120 is disposed in the frame 110, where the cell module 120 includes at least two cells 121 stacked along a first direction X, the cells 121 have a bottom surface (not shown) and a top surface (not shown) that are disposed opposite to each other, the bottom surface faces the first opening 111, a plane of the first opening 111 is a bottom surface of the battery pack 100, and a plane of the second opening 112 is a top surface of the battery pack 100. The number of the cell modules 120 is at least one, and in this embodiment, the number of the cell modules 120 is two, and the cell modules are arranged at intervals along the second direction Y.

The first cover 130 is disposed on the first opening 111, and the first cover 130 is fixedly connected to the bottom surface of the battery cell 121. Specifically, the bottom surface of the battery cell 121 is provided with an adhesive layer 1211 along the length direction of the bottom surface, one surface of the first cover plate 130 facing the battery cell module 120 is in adhesive connection with the bottom surface of the battery cell 121 through the adhesive layer 1211, so as to realize the fixed connection between the first cover plate 130 and the bottom surface of the battery cell 121, the adhesive layer 1211 contains an adhesive, and the adhesive has a heat conduction effect, so that heat generated in the working process of the battery cell 121 can be conducted to the first cover plate 130 to realize heat conduction. The first cover plate 130 is fixedly connected with the bottom surface of the battery cell 121, and a cross beam and a longitudinal beam are not required to be arranged in the frame 110, so that the stability of the battery cell module 120 in the frame 110 can be ensured. In addition, the opposite ends of the first cover 130 in the first direction X are respectively and fixedly connected with the frame 110, so that the first cover 130 is firmly connected with the frame 110, and the stability of the installation of the battery module 120 in the frame 110 is further enhanced.

Wherein, the definition of the first direction X and the second direction Y is: the surface of the first cover plate 130 facing the cell module 120 is taken as a reference surface, and the reference surface has a first direction X and a second direction Y which are perpendicular to each other.

Referring to fig. 1, 2 and 5 to 8, the protection plate 140 is disposed on one surface of the first cover plate 130 facing away from the battery cell module 120, the protection plate 140 is fixedly connected with the first cover plate 130, a plurality of protrusions 141 are disposed on the protection plate 140, the protection plate 140 protrudes towards the first cover plate 130 facing away from the first cover plate 130 to form protrusions 141, the protrusions 141 extend along the first direction X, and the protrusions 141 are arranged at intervals along the second direction Y, so that the protection plate 140 has a wave structure in a shape of a Chinese character 'ji', and the protrusions 141 are disposed, so that high-strength deformation and force allocation can be provided when the bottom of the battery pack 100 is subjected to external impact force, thereby carrying out safety protection on the whole battery cell module 120, and simultaneously providing a supporting function for rigidity of the whole battery pack 100, and improving the overall rigidity of the battery pack 100.

In addition, referring to fig. 1, 2 and 5 to 8, the battery pack 100 further includes a buffer member 150, the buffer member 150 is disposed between the first cover plate 130 and the protection plate 140, the design of the protruding portion 141 on the protection plate 140 enables the protruding portion 141 to define a receiving cavity on one side of the protection plate 140 towards the first cover plate 130, the buffer member 150 is in a strip shape, the buffer member 150 is embedded in the receiving cavity, the buffer member 150 is attached to one side of the first cover plate 130 towards the protection plate 140, the buffer member 150 corresponds to the protruding portion 141 in number one-to-one, the buffer members 150 are arranged at intervals along the second direction Y to form a buffer layer, the safety protection of the bottom surface of the battery core 121 of the buffer member 150 provides energy absorption buffer, the impact force applied to the bottom of the battery core module 120 is decomposed and absorbed, and the buffer member 150 and the protruding portion 141 of the protection plate 140 are matched to realize double-layer protection of the bottom of the battery core module 120 (the bottom surface of the battery core 121).

Further, referring to fig. 1, 2 and 4 to 8, the battery pack 100 further includes a support 160, the support 160 is disposed between the cell module 120 and the first cover 130, in this embodiment, the number of the support 160 is three, including a first support 160a, a second support 160b and a third support 160c, the number of the cell modules 120 in the frame 110 is two, the first support 160a extends along the first direction X, two ends of the first support 160a disposed opposite to each other along the second direction Y are respectively connected with the bottom surfaces of the cells 121 in the two cell modules 120 in an adhesive manner, specifically, referring to fig. 4, two ends of one surface of the first support 160a facing the cell modules 120 are respectively provided with adhesive portions 161, the adhesive portions 161 extend along the first direction X, and the first support 160a is connected with the bottom surfaces of the cells 121 in one cell module 120 in an adhesive manner through one adhesive portion 161, and connected with the bottom surfaces of the cells 121 in the other cell module 120 in an adhesive manner through the other adhesive portion 161.

Referring to fig. 4, the first support 160a has a hollow portion 162, the hollow portion 162 penetrates through the first support 160a along the first direction X, so that the first support 160a has a cross-sectional structure in a shape like a Chinese character 'hui', the length of the hollow portion 162 along the second direction Y is a, the thickness of the hollow portion 162 is b, the length of the first support 160a along the second direction Y is c, the thickness of the first support 160a is d, the length of each adhesive portion 161 along the second direction Y is e, and the dimension a is determined according to the distance between two adjacent cell modules 120 along the second direction Y, and is generally 1.5 to 2.8 times the distance between the two adjacent cell modules 120; b is 1/3 to 1/2 of d; c is 1.2-1.8 times of a; e is 1/2-1/3 of the distance between two adjacent cell modules 120 in the second direction Y; meanwhile, when the bottom surface of the battery cell 121 is glued to the gluing portion 161, a non-gluing area of 20-40 mm needs to be left at the end of the bottom surface of the battery cell 121, so that concentrated stress on the pole 1212 side of the battery cell 121 can be avoided.

In other implementations, referring to fig. 5 to 7, the first support 160a is disposed between the shielding plate 140 and the first cover plate 130, forming a support for the first cover plate 130 and the shielding plate 140.

Referring to fig. 2, two opposite ends of the frame 110, where the first opening 111 is disposed opposite to each other along the second direction Y, are respectively provided with a protruding fin 114, a gap is left between the fin 114 and the cell module 120, and a second supporting member 160b and a third supporting member 160c are respectively filled in the gap between the fin 114 and the cell module 120 to form a connection between the bottom surface of the cell 121 and the fin 114, and the second supporting member 160b and the third supporting member 160c provide rigidity and supporting effects between the cell module 120 and the frame 110.

The first support 160a, the second support 160b, and the third support 160c have hollow structures, respectively, so that the first support 160a absorbs energy from buffering before the first cover plate 130 and the cell module 120, and the second support 160b and the third support 160c absorb energy from buffering between the cell module 120 and the fins 114. In other implementations, the first support 160a, the second support 160b, and the third support 160c may be made of a composite material having a buffering and energy absorbing function, such as foam, etc.

In addition, referring to fig. 5, the electric core 121 has two end walls oppositely disposed along the second direction Y, one pole 1212 is disposed on each of the two end walls, an explosion-proof valve (not shown in the drawing) of the electric core 121 is disposed on the bottom surface of the electric core 121, referring to fig. 1-3 and 8, the first cover plate 130 is provided with pressure relief openings 131 oppositely disposed with the explosion-proof valve, the number of the pressure relief openings 131 corresponds to the number of the explosion-proof valves one by one, the plurality of pressure relief openings 131 are arranged at intervals along the first direction X, referring to fig. 1, 2 and 5 and 6, the surface of the protection plate 140 facing the first cover plate 130 is provided with pressure relief grooves 142, the pressure relief grooves 142 are oppositely disposed with the pressure relief openings 131, the pressure relief grooves 142 extend along the first direction X, and the two ends of the pressure relief grooves 142 oppositely disposed along the first direction X are respectively penetrated through the protection plate 140 to form pressure relief channels 1421 on the protection plate 140, and each of the electric core modules 120 corresponds to one pressure relief channel 1421. In the embodiment of the application, the explosion-proof valve is arranged on the bottom surface of the battery cell 121, when the battery pack 100 is in the working process, the battery cell 121 is discharged through the explosion-proof valve due to thermal runaway in the circulating working process, the discharged gas is discharged to the pressure release channel 1421 through the pressure release opening 131 and is discharged to the outer side of the battery pack 100 through the pressure release channel 1421, and compared with the arrangement form of the battery cell, the use safety of the battery pack 100 can be improved.

In addition, the protection plate 140 is adhesively connected with the first cover plate 130 through the adhesive members 143 to achieve the fixed connection between the protection plate 140 and the first cover plate 130, the number of the adhesive members 143 is plural, the adhesive members 143 extend along the first direction X, the plural adhesive members 143 and the protruding portions 141 are arranged at intervals along the second direction Y, specifically, referring to fig. 1 to 3 and 8, the adhesive members 143 and the protruding portions 141 are alternately arranged at intervals along the second direction Y.

In addition, the battery pack 100 further includes a second cover plate 170, the second cover plate 170 is covered on the second opening 112, the second cover plate 170 is in adhesive connection with the top surface of the battery cell 121, the second cover plate 170, the first cover plate 130 and the frame 110 cooperate to define an accommodating space for accommodating the battery cell module 120, the first cover plate 130 and the second cover plate 170 are respectively in adhesive connection with the bottom surface and the top surface of the battery cell 121, so as to fix the battery cell module 120 in the frame 110, thereby avoiding the use of a cross beam and a longitudinal beam in the frame 110, reducing the manufacturing cost, ensuring the stability of the installation of the battery cell module 120 in the frame 110, and ensuring the compact structure of the whole battery pack 100.

In addition, in one implementation, referring to fig. 1 to 2, a first flow channel 132 for cooling liquid to flow is provided on one surface of the first cover plate 130 facing the protection plate 140, and the first flow channel 132 is S-shaped and is arranged on the first cover plate 130 in a meandering manner, so that the first cover plate 130 forms a liquid cooling plate structure, and cooling of the battery cells 121 is achieved. The second cover plate 170 is provided with a second flow channel (not shown in the figure) for cooling liquid to flow on the surface facing away from the first cover plate 130, so that the second cover plate 170 forms a liquid cooling plate structure, and the second cover plate and the first cover plate 130 cooperate to realize cooling of the battery core 121. In another implementation, referring to fig. 8, the first cover 130 and the second cover 170 are both plate bodies, and no flow channels are provided, which can be selected according to practical requirements.

In order to verify the stress performance of the battery pack, vibration analysis is performed, the analysis boundary is the ten degrees of freedom of the bushings 1-6 of the constraint and vehicle body installation position, the modal frequency is extracted, the analysis result shows that the first-order overall modal frequency of the traditional battery pack structure with longitudinal beams and transverse beams is 44.7Hz, the first-order overall modal frequency of the battery pack 100 structure provided by the embodiment of the application is 49.5Hz, the requirement of being greater than the reference first-order overall modal frequency of 45Hz is met, and the battery pack is suitable for a non-beam battery pack structure of a novel battery cell structure (opposite side or same side of a pole, with an explosion-proof valve facing downwards).

Meanwhile, the embodiment of the application also provides a vehicle, which comprises the battery pack 100, and the battery pack 100 provides electric energy for the vehicle.

The foregoing has outlined a detailed description of a battery pack and vehicle provided in embodiments of the present application, wherein specific examples are provided herein to illustrate the principles and embodiments of the present application, the above examples being provided solely to assist in understanding the methods of the present application and their core ideas; meanwhile, those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present application, and the present description should not be construed as limiting the present application in view of the above.

Claims

1. A battery pack, comprising:

a frame (110) having a first opening (111) and a second opening (112) which are disposed opposite to each other;

a cell module (120) disposed in the frame (110), the cell module (120) including at least two cells (121) stacked along a first direction (X), the cells (121) having oppositely disposed top and bottom surfaces, the bottom surfaces of the cells (121) facing the first opening (111);

the first cover plate (130) is covered on the first opening (111), and the first cover plate (130) is fixedly connected with the bottom surface of the battery cell (121);

the protection plate (140) is arranged on one surface of the first cover plate (130) away from the battery cell module (120), and the protection plate (140) is fixedly connected with the first cover plate (130);

wherein, be provided with at least one bellying (141) on guard plate (140), bellying (141) is to keeping away from the direction of first apron (130) protrusion, bellying (141) are along first direction (X) extension.

2. The battery pack according to claim 1, further comprising at least one buffer member (150) disposed between the protection plate (140) and the first cover plate (130), the buffer member (150) extending along the first direction (X);

the boss (141) is in the guard plate (140) orientation first apron (130) one side is limited and is held the chamber, buffer (150) inlay and locate in this holds the chamber, buffer (150) with first apron (130) laminating mutually.

3. The battery pack according to claim 1, further comprising at least one support member (160), the support member (160) extending along the first direction (X), the support member (160) being disposed between the cell module (120) and the first cover plate (130), the support member (160) being adhesively connected to the bottom surface of the cell (121);

alternatively, the support member (160) is disposed between the first cover plate (130) and the shielding plate (140).

4. A battery pack according to claim 3, wherein the support member (160) has a hollow structure.

5. The battery pack according to claim 1, wherein the bottom surface of each cell (121) is provided with an explosion-proof valve;

and a pressure relief opening (131) which is opposite to the explosion-proof valve is formed in the first cover plate (130).

6. The battery pack according to claim 5, wherein a pressure release groove (142) is formed in a surface of the protection plate (140) facing the first cover plate (130), the pressure release groove (142) is opposite to the pressure release opening (131), the pressure release groove (142) extends along the first direction (X), and two ends of the pressure release groove (142) opposite to the first direction (X) respectively penetrate through the protection plate (140) so as to form a pressure release channel (1421) on the protection plate (140).

7. The battery pack according to claim 1, wherein the protection plate (140) is adhesively connected to the first cover plate (130) by at least two adhesive members (143), the adhesive members (143) extending in the first direction (X), the at least two adhesive members (143) being spaced apart from the protruding portion (141) in a second direction (Y), the second direction (Y) being perpendicular to the first direction (X).

8. The battery pack according to claim 7, wherein opposite ends of the first cover plate (130) in the first direction (X) are fixedly connected to the frame body (110), respectively.

9. The battery pack according to claim 1, further comprising a second cover plate (170), wherein the second cover plate (170) covers the second opening (112), and the second cover plate (170) is adhesively connected to the top surface of the electric core (121).

10. A vehicle comprising a battery pack according to any one of claims 1 to 9.