CN217691429U - Battery module and electronic device - Google Patents

Abstract

The utility model belongs to the technical field of the battery, a battery module and electron device is disclosed. The battery module comprises a module shell and a plurality of battery cells; the module shell comprises a module frame and two side plate components fixedly connected to the module frame; the battery cores are stacked in the module frame along a preset direction; wherein, two curb plate subassemblies are located the both sides of the orientation of piling up of a plurality of electric cores respectively, and at least one curb plate subassembly includes outer panel and interior welt, and outer panel fixed connection is in module frame, and interior welt is located between a plurality of electric cores and the outer panel, is provided with the elastic component between interior welt and the outer panel. This battery module can effectively reduce the extrusion force that the module curb plate received because of electric core inflation leads to, improves battery module's safety in utilization.

Description

Battery module and electronic device

Technical Field

The utility model relates to a battery technology field especially relates to a battery module and electron device.

Background

With the popularization of new energy automobiles, the development of power batteries is more and more rapid. The traditional lithium ion battery consists of a positive electrode, a negative electrode, a diaphragm and electrolyte, the electrolyte leakage phenomenon easily occurs when the traditional lithium ion battery is impacted by external force, the electrolyte contains inflammable organic solvent, the temperature suddenly rises easily to cause combustion and even explosion when the internal short circuit occurs, and research personnel are invested in the development of solid-state batteries in order to overcome the defects of the lithium ion battery.

The solid-state battery is a battery using a solid electrolyte, and in terms of the operating principle, the solid-state battery is not different from a conventional lithium ion battery. The solid electrolyte adopted by the solid battery has improved stability and safety, and the solid electrolyte is used for replacing the electrolyte, so that the solid battery has high safety. But the battery core of solid-state battery module can take place the inflation at its metal electrode of charge-discharge in-process, causes the inside electric core of module to extrude each other, and this extrusion force finally conducts to the module curb plate. The module curb plate can make the junction of module curb plate and module casing take place phenomenons such as fracture, deformation inefficacy under receiving the effect of electric core inflation power, causes the module curb plate to deform, break even, causes the battery module to damage, influences its life.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a battery module can effectively reduce the extrusion force that the module curb plate received because of electric core inflation leads to, improves the safety in utilization of battery module.

To achieve the purpose, the utility model adopts the following technical proposal:

the battery module comprises a module shell and a plurality of battery cores; the module shell comprises two side plate components which are oppositely arranged; the battery cores are stacked in the module shell along the preset direction; wherein, two curb plate subassemblies are located the both sides of the direction of piling up of a plurality of electric cores respectively, and at least one curb plate subassembly includes outer liner and interior welt, and interior welt is located between a plurality of electric cores and the outer liner, is provided with the elastic component between interior welt and the outer liner.

Optionally, one end of the elastic member is connected with the inner lining plate, the other end of the elastic member is connected with the outer side plate, and the elastic member is any one of a spring, a rubber ring and an air cushion.

Optionally, the elastic member is provided with a plurality of elastic members, and the plurality of elastic members are distributed at intervals.

Optionally, the elastic member is a spring, a guide post is inserted into the spring, a guide hole is formed in the outer side plate, a first end of the guide post is fixedly connected with the inner lining plate, and the outer peripheral surface of the guide post is slidably connected with the guide hole.

Optionally, a limiting portion is arranged at a second end, away from the inner lining plate, of the guide post, the sectional area of the limiting portion is larger than that of the first end, and the limiting portion can abut against one side, away from the plurality of battery cells, of the guide hole.

Optionally, the outer panel further includes an accommodating portion, the guide hole and the accommodating portion are arranged along the direction from the inner lining plate to the outer panel, the outer peripheral surface of the guide post is connected with the guide hole in a sliding manner, the accommodating portion is used for accommodating the limiting portion, and the limiting portion can abut against the end face, close to the guide hole, of the accommodating portion.

Optionally, the module housing includes two cover plates disposed oppositely, the two cover plates are respectively located at two ends of the plurality of battery cells in the height direction, and the two side plate assemblies are both connected to the two cover plates; the outer side plate is fixedly connected with the two cover plates, and the inner lining plate can move along the stacking direction of the plurality of battery cells relative to the two cover plates.

Optionally, the distance between the outer side plate and the inner lining plate is L1, the distance between the two side plate assemblies is L2, and L1 is not more than L2 × 0.15.

Optionally, the plurality of cells are solid-state cells.

Another object of the present invention is to provide an electronic device, which includes the battery module of any of the above solutions.

Has the advantages that:

the battery module in this embodiment, it is through setting up the curb plate subassembly into the form that includes outer panel and interior welt, and be provided with the elastic component between outer panel and interior welt, make outer panel and interior welt can elastic connection, when battery module inside electricity core takes place the inflation, the bulging force of electricity core is at first conducted to interior welt, conduct to the outer panel by the elastic component afterwards, this elastic component can be when bearing the inflation pressure, can also restrain the inflation volume of electricity core, prevent that the pressure that the outer panel bore is too big, prevent that the outer panel, and the junction of outer panel and module frame from taking place phenomenons such as fracture deformation, the security when having improved battery module and using.

Drawings

Fig. 1 is an exploded view of a battery module according to an embodiment of the present invention;

fig. 2 is a top view of a battery module according to an embodiment of the present invention;

FIG. 3 isbase:Sub>A cross-sectional view taken at A-A in FIG. 2;

fig. 4 is a partially enlarged view at B in fig. 3.

In the figure:

100. a module housing; 111. a cover plate; 1111. mounting grooves; 112. a bus bar; 120. a side plate assembly; 121. an outer panel; 1211. a guide hole; 1212. an accommodating portion; 1213. mounting holes; 122. an inner lining plate; 1221. connecting a threaded hole; 123. an elastic member; 124. a guide post; 1241. a limiting part; 200. an electric core; 210. a spacer.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected", "connected" and "fixed" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation of the first and second features not being in direct contact, but being in contact with another feature between them. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", and the like are used based on the orientations and positional relationships shown in the drawings, and are only for convenience of description and simplification of operation, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

Referring to fig. 1 and 4, in the present embodiment, the battery module includes a module housing 100 and a plurality of battery cells 200; the module housing 100 includes two side plate assemblies 120; the large faces of the plurality of battery cells 200 are opposite to each other in pairs and are stacked in the module frame along the preset direction; the two side plate assemblies 120 are respectively located at two sides of the stacking direction of the plurality of battery cells 200, at least one side plate assembly 120 includes an outer plate 121 and an inner lining plate 122, the inner lining plate 122 is located between the plurality of battery cells 200 and the outer plate 121, and an elastic member 123 is disposed between the inner lining plate 122 and the outer plate 121. Further, the two side plate assemblies 120 in this embodiment each include an outer plate 121 and an inner lining plate 122, the outer plate 121 is fixedly connected to the module frame, the inner lining plate 122 is located between the plurality of battery cells 200 and the outer plate 121, and an elastic member 123 is disposed between the inner lining plate 122 and the outer plate 121.

In the battery module in this embodiment, the side plate assembly 120 is configured to include the outer plate 121 and the inner lining plate 122, and the elastic member 123 is disposed between the outer plate 121 and the inner lining plate 122, so that the outer plate 121 and the inner lining plate 122 can be elastically connected, when the battery cell 200 expands inside the battery module, the expansion force of the battery cell 200 is first transmitted to the inner lining plate 122, and then transmitted to the outer plate 121 by the elastic member 123, the elastic member 123 can bear the expansion pressure, and at the same time, the expansion volume of the battery cell 200 can be further suppressed, the pressure borne by the outer plate 121 is prevented from being too large, the outer plate 121 and the connection between the outer plate 121 and the module frame are prevented from cracking and deforming, and the use safety of the battery module is improved.

In this embodiment, the module housing 100 includes two cover plates 111 disposed oppositely, the two cover plates 111 are respectively located at two ends of the plurality of battery cells 200 in the height direction, the two side plate assemblies 120 are both connected to the two cover plates 111, wherein the outer side plates 121 of the side plate assemblies 120 are respectively fixedly connected to the two cover plates 111, and the inner lining plate 122 can move along the stacking direction of the plurality of battery cells 200 relative to the two cover plates 111. Here, the height direction of the battery cell 200 refers to the height direction of the battery cell stack body after the battery cells 200 are stacked in parallel, that is, the vertical direction. Specifically, the module housing 100 further includes two busbars 112 respectively abutted to two end surfaces where the output electrode of the battery cell 200 is located, a connecting hole is formed in the busbar 112 for inserting the electrode of the battery cell 200, the electrode of the battery cell 200 is welded to the busbar 112, of course, the output electrode is further installed on the busbar 112, and the output electrode is electrically connected to the electrode of the battery cell 200 through the busbar 112, so as to connect the battery cell 200 to an external device. Module shell 100 still includes two end plates of butt respectively in two busbar 112 outsides, and two end plates, two apron 111 and two curb plate subassembly 120 fixed connection assemble into the casing of a cuboid, form a confined cuboid and hold the chamber to hold a plurality of electric cores 200 that pile up the setting.

The cover plate 111, the outer plate 121, and the inner lining plate 122 in this embodiment are all made of aluminum alloy, which has the advantages of low density, high mechanical strength, easy processing, corrosion resistance, low price of raw materials, and capability of reducing the manufacturing cost of the battery module. The bus bar 112, which is commonly used in the battery module, includes: the nickel plate bar, the copper-aluminum composite bar, the copper bar, the total positive total negative bar, the aluminum bar, the copper flexible connection, the aluminum flexible connection, the copper foil flexible connection, etc. can be used, and those skilled in the art can select the bus bar 112 with different materials and types according to actual requirements, and the embodiment is not particularly limited.

Referring to fig. 1 and 2, two end surfaces of the outer plate 121 along the vertical direction are provided with mounting holes 1213, the two cover plates 111 are provided with mounting grooves 1111 corresponding to the mounting holes 1213 one by one, and the outer plate 121 is fixed to the two cover plates 111 disposed opposite to each other up and down by passing a connecting bolt through the mounting holes 1213 and the mounting grooves 1111. In other alternative embodiments, the outer plate 121 may be fixed to the cover plate 111 by welding or bonding. In this embodiment, each end surface of the outer plate 121 along the vertical direction has 4 mounting holes 1213, and correspondingly, each side edge of the cover plate 111 has 4 mounting grooves 1111, and in other alternative embodiments, a person skilled in the art can select the number of the mounting holes 1213 according to actual requirements, which is not limited herein.

As shown in fig. 3, in the present embodiment, a plurality of battery cells 200 are stacked in parallel, and spacers 210 are further disposed between each two adjacent battery cells 200 and between the outermost battery cells 200 and the inner liner plate 122. The spacer 210 may be a pad made of an elastic material such as foam, felt, or rubber pad, and not only can protect the side wall surface of the battery cell 200, but also can play a role in buffering. The spacer 210 is used for protecting the battery cell 200 from being damaged by the inner lining plate 122, the battery cell 200 can be prevented from being scratched by the inner lining plate 122, the spacer 210 is arranged between the two battery cells 200, a buffering effect can be achieved, damage caused by mutual rubbing between the two adjacent battery cells 200 can be prevented, and the safety of the battery module in use is improved.

Specifically, the outer panel 121 is a hollow structural section with a cavity, which can reduce the overall quality of the outer panel 121, and a reinforcing structure, such as a transverse rib plate, a vertical rib plate, etc., is disposed in the cavity, which can enhance the structural strength of the outer panel 121.

With reference to fig. 4, the detailed structure and connection of the side plate assembly 120 will be described in detail with reference to the enlarged view. In this embodiment, the elastic member 123 of the side plate assembly 120 is connected to the inner lining 122 at one end and connected to the outer plate 121 at the other end, and the elastic member 123 is any one of a spring, a rubber ring and an air cushion, and is preferably a spring in this embodiment. The spring is made of alloy steel, and has the advantages of easy processing and forming, low manufacturing cost, difficult failure and high reliability. The spring made of alloy steel is a pressure-bearing spring, and since the expansion of the battery cell 200 applies a pressure to the inner lining plate 122, the pressure is transmitted to the outer side plate 121, and the pressure-bearing spring can bear the transmitted pressure and can inhibit the expansion of the battery cell 200. Since the battery cell 200 in this embodiment is a solid-state battery cell 200, and when the battery cell is used, a certain pressure needs to be applied to the battery cell 200 from the outside, so that the solid-state electrolyte can normally work only when the solid-state electrolyte contacts with the pole piece of the battery cell 200, when the spring is installed between the outer side plate 121 and the inner lining plate 122, the spring is in a compressed state, so as to apply a pressure to the solid-state battery cell 200, and thus the solid-state battery cell 200 can normally work.

Optionally, the elastic member 123 is provided in plurality, and the plurality of elastic members 123 are distributed at intervals. In this embodiment, the elastic members 123 are arranged in 2 rows and 3 columns, which are 6 in total, and can uniformly distribute the pressure generated by the expansion of the battery cell 200, so that one elastic member 123 does not need to be used to bear the pressure, and the phenomena that the elastic member 123 fails due to the local excessive pressure and the elastic member 123 pierces the outer side plate 121 or the inner lining plate 122 are avoided. Those skilled in the art can select different numbers, different distribution manners, or different elastic moduli of the elastic members 123 according to actual requirements, such as the area of the inner lining plate 122, the number of the battery cells 200, and the like, and the embodiment is not particularly limited.

In this embodiment, the elastic member 123 is a spring, a guiding post 124 is inserted into the spring, a guiding hole 1211 is disposed on the outer plate 121, a first end of the guiding post 124 is fixedly connected to the inner lining plate 122, specifically, a threaded connection hole 1221 is disposed on the inner lining plate 122, the guiding post 124 is threadedly connected to the inner lining plate 122, and an outer peripheral surface of the guiding post 124 is slidably connected to the guiding hole 1211. The sliding connection between the guide post 124 and the guide hole 1211 realizes a guiding function, and also realizes the smooth movement of the inner lining plate 122 relative to the outer side plate 121, thereby preventing the inner side plate from tilting due to the deflection of the spring caused by an excessive pressure.

Optionally, a second end of the guide post 124, which is away from the inner lining plate 122, is provided with a limiting portion 1241, a cross-sectional area of the limiting portion 1241 is larger than a cross-sectional area of the first end, and the limiting portion 1241 can abut against a side of the guide hole 1211, which is away from the plurality of battery cells 200. By providing the stopper 1241, when the guide post 124 is inserted from the guide hole 1211 into the inner liner 122 from the outer panel 121, the guide post 124 is prevented from falling into the space between the outer panel 121 and the inner liner 122 from the guide hole 1211, and the convenience in mounting is improved.

In a preferred embodiment, the outer plate 121 further includes a receiving portion 1212, the guide hole 1211 and the receiving portion 1212 are aligned along the inner lining plate 122 toward the outer plate 121, the outer peripheral surface of the guide post 124 is slidably connected to the guide hole 1211, the receiving portion 1212 is configured to receive the limiting portion 1241, and the limiting portion 1241 is configured to abut against an end surface of the receiving portion 1212 close to the guide hole 1211. Specifically, the depth of the receiving portion 1212 is determined such that the limiting portion 1241 is not exposed from the opening of the receiving portion 1212, which is far from the guiding hole 1211, when the elastic member 123 is fully compressed, thereby preventing the guiding post 124 from damaging surrounding devices when extending out. The accommodating portion 1212 can also accommodate the limiting portion 1241, so that an additional space is not required to accommodate the limiting portion 1241 when the battery module is used, thereby reducing the volume occupied by the battery module.

Specifically, the distance between the outer side plate 121 and the inner lining plate 122 is L1, the distance between the two side plate assemblies 120 is L2, and L1 is equal to or less than L2 × 0.15. The battery cell 200 in this embodiment is a solid-state battery cell, the maximum expansion rate of the solid-state battery cell is about 0.15, and the maximum expansion size of the solid-state battery cell in the stacking direction of the battery cell 200 is the total thickness of the battery cell 200 multiplied by 0.15, that is, the distance between the two side plate assemblies 120 is multiplied by 0.15; therefore, a predetermined distance is provided between the outer side plate 121 and the inner lining plate 122 to accommodate the expansion volume of all the cells 200, i.e., L2 × 0.15. In other alternative embodiments, the preset distance, that is, the distance between the two side plate assemblies 120 multiplied by the expansion rate of the battery cells 200, may be set by those skilled in the art according to the expansion rates of different types of battery cells 200.

Another object of the present invention is to provide an electronic device, which includes the battery module of any of the above solutions. The electronic device using the battery module can improve the safety and reliability in use and reduce the maintenance cost.

It is to be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Numerous obvious variations, rearrangements and substitutions will now occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. A battery module, comprising:

the module shell comprises two side plate assemblies which are oppositely arranged;

the battery cells are stacked and arranged in the module shell along a preset direction; wherein the content of the first and second substances,

the two side plate assemblies are respectively positioned on two sides of the stacking direction of the plurality of battery cells, at least one side plate assembly comprises an outer side plate and an inner lining plate, the inner lining plate is positioned between the plurality of battery cells and the outer side plate, and an elastic part is arranged between the inner lining plate and the outer side plate.

2. The battery module according to claim 1, wherein the elastic member is connected to the inner liner at one end and the outer side plate at the other end, and the elastic member is any one of a spring, a rubber ring and an air cushion.

3. The battery module according to claim 2, wherein the elastic member is provided in plurality, and the plurality of elastic members are spaced apart from each other.

4. The battery module according to claim 2, wherein the elastic member is a spring, a guide post is inserted into the spring, a guide hole is formed in the outer plate, a first end of the guide post is fixedly connected to the inner lining, and an outer circumferential surface of the guide post is slidably connected to the guide hole.

5. The battery module according to claim 4, wherein a limiting portion is disposed at a second end of the guide post away from the inner lining plate, a sectional area of the limiting portion is larger than that of the first end, and the limiting portion can abut against one side of the guide hole away from the plurality of battery cells.

6. The battery module according to claim 5, wherein the outer plate further includes a receiving portion, the guide holes and the receiving portions are arranged in a direction from the inner liner toward the outer plate, the guide post outer circumferential surfaces are slidably connected to the guide holes, the receiving portion is configured to receive the stopper portion, and the stopper portion is configured to abut against an end surface of the receiving portion near the guide holes.

7. The battery module according to claim 1, wherein the module housing comprises two cover plates which are oppositely arranged, the two cover plates are respectively located at two ends of the plurality of battery cells in the height direction, and the two side plate assemblies are connected to the two cover plates; wherein, the first and the second end of the pipe are connected with each other,

the outer side plate is fixedly connected with the two cover plates, and the inner lining plate can move along the stacking direction of the battery cells relative to the two cover plates.

8. The battery module according to any one of claims 1 to 7, wherein the distance between the outer side plate and the inner liner plate is L1, the distance between the two side plate assemblies is L2, and L1 ≦ L2 × 0.15.

9. The battery module according to any one of claims 1-7, wherein the plurality of cells are solid-state cells.

10. An electronic device, characterized by comprising the battery module according to any one of claims 1 to 9.

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