CN217691428U - 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 shell and a plurality of battery cell units, wherein the shell comprises an upper cover plate and a lower cover plate which are arranged oppositely, the upper cover plate is provided with a first mounting surface opposite to the lower cover plate, the first mounting surface is provided with a plurality of first limiting grooves, the lower cover plate is provided with a second mounting surface opposite to the first mounting surface, the second mounting surface is provided with a plurality of second limiting grooves, and the first limiting grooves and the second limiting grooves are equal in number and are arranged oppositely one by one; a plurality of electric core units are parallelly stacked in the shell, and each electric core unit is inserted into a first limiting groove and a second limiting groove opposite to the first limiting groove. This battery module can effectively reduce because of the electric core displacement that the electric core inflation caused, reduces the extrusion force that module curb plate received, improves the safety in utilization of battery module.

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. Traditional lithium ion battery comprises positive pole, negative pole, diaphragm and electrolyte, takes place electrolyte leakage phenomenon easily when receiving external force to contain inflammable organic solvent in the electrolyte, the temperature shock arouses the burning easily when taking place internal short circuit, explodes even, for overcoming lithium ion battery's above-mentioned shortcoming, research and development personnel are investing in solid state battery's development.

The solid-state battery is a lithium ion battery using a solid electrolyte, and in terms of the working principle, the all-solid-state battery is not different from the 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. However, the metal electrode of the battery cell of the solid-state battery module expands and generates extrusion force in the charging and discharging processes, and the extrusion force is finally transmitted to the module side plate. The module curb plate is receiving under the effect of electric core inflation power, can make the junction of module curb plate and module casing take place phenomenons such as fracture, deformation inefficacy, causes the module curb plate deformation even, breaks, 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 because of the electric core displacement that electric core inflation caused, reduces the extrusion force that the module curb plate received, 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 shell and a plurality of battery cell units, wherein the shell comprises an upper cover plate and a lower cover plate which are arranged oppositely, the upper cover plate is provided with a first mounting surface opposite to the lower cover plate, the first mounting surface is provided with a plurality of first limiting grooves, the lower cover plate is provided with a second mounting surface opposite to the first mounting surface, the second mounting surface is provided with a plurality of second limiting grooves, and the first limiting grooves and the second limiting grooves are equal in number and are arranged oppositely one by one; a plurality of electric core units are parallelly stacked in the shell, and each electric core unit is inserted into a first limiting groove and a second limiting groove opposite to the first limiting groove.

Optionally, a protection pad is disposed between the side wall surface of the battery cell unit and the side wall surfaces inside the first limiting groove and the second limiting groove.

Optionally, the bottom surfaces of the inner portions of the first limiting groove and the second limiting groove are respectively provided with an insulating film, and the insulating films are used for being insulated from the cell units.

Optionally, the heights of the first limiting groove and the second limiting groove do not exceed 10% of the height of the cell unit.

Optionally, the notches of the first and second limiting grooves are provided with fillets.

Optionally, the housing further comprises a connection beam connecting the upper cover plate and the lower cover plate.

Optionally, the upper cover plate, the lower cover plate and the connecting beam are integrally formed.

Optionally, at least two adjacent battery cell sets are combined into a battery cell set, and an elastic member is disposed between the two adjacent battery cell sets.

Optionally, a spacer is disposed between two adjacent cell units and/or between a cell unit and the elastic member.

Optionally, the elastic member is a spring, and the length of the spring is gradually shortened from the center of the battery module to the two sides.

Alternatively, the elastic modulus of the elastic member is gradually increased from both sides of the battery module to the center.

Another object of the utility model is to provide an electronic device, it uses as above-mentioned arbitrary scheme the battery module, the difficult displacement of electric core, the stable performance of this battery module can improve electronic device's security.

Has the beneficial effects that:

the battery module is characterized in that a first limiting groove and a second limiting groove are respectively arranged on an upper cover plate and a lower cover plate which are oppositely arranged, each battery cell unit is respectively inserted into the first limiting groove and the second limiting groove corresponding to the first limiting groove, and the single battery cell unit is fixed by the first limiting groove and the second limiting groove, so that the installation stability of the battery cell unit can be improved; simultaneously, even when electric core unit takes place the inflation, when its bulging force conducts to adjacent electric core unit, can not promote adjacent electric core unit and take place the displacement, also this bulging force can be born by first spacing groove and second spacing groove, can not reduce the extrusion force that the module curb plate received along the module curb plate of the direction conduction of piling up of a plurality of electric core units to the battery module on, prevent that the module curb plate from taking place to break or drop, improve the safety in utilization of battery module.

Drawings

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

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

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

fig. 4 is a schematic diagram of a housing according to an embodiment of the present invention.

In the figure:

100. a housing; 110. an upper cover plate; 1101. a first mounting surface; 111. a first limit groove; 1111. a trough side plate; 120. a lower cover plate; 1201. a second mounting surface; 121. a second limit groove; 130. a module side plate; 140. a module end plate; 141. a bus bar; 150. a connecting beam; 160. an elastic member; 20. a cell body; 200. a cell unit; 210. a spacer; 220. and connecting the pole pieces.

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 associated with the present invention are shown in the drawings, not all of them.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. 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", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular 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 to 4, in the present embodiment, the battery module includes a housing 100 and a plurality of battery cell units 200, the housing 100 includes an upper cover plate 110 and a lower cover plate 120 that are oppositely disposed, the upper cover plate 110 has a first mounting surface 1101 opposite to the lower cover plate 120, a plurality of first limiting grooves 111 are formed on the first mounting surface 1101, the lower cover plate 120 has a second mounting surface 1201 opposite to the first mounting surface 1101, a plurality of second limiting grooves 121 are formed on the second mounting surface 1201, and the plurality of first limiting grooves 111 and the plurality of second limiting grooves 121 are equal in number and are disposed in one-to-one correspondence; the first mounting surface 1101 and the second mounting surface 1201 referred to in this embodiment are the surfaces opposite to the upper cover plate 110 and the lower cover plate 120, respectively, that is, the inner wall surface of the housing 100; the plurality of cell units 200 are stacked in parallel in the casing 100, and when the plurality of cell units 200 are stacked in parallel, the large faces of the plurality of cell units 200 are stacked in parallel in pairs, and each cell unit 200 is inserted into one first limiting groove 111 and one second limiting groove 121 opposite to the first limiting groove 111 in the casing 100.

As shown in fig. 1, the upper cover plate 110 and the lower cover plate 120 are both rectangular plate-shaped, and are assembled relatively, in order to close the openings on both sides, the casing 100 further includes two module side plates 130 oppositely disposed along the stacking direction of the plurality of battery cells, the upper portion of the module side plate 130 is provided with a mounting hole, the battery module is connected with external equipment by penetrating a connecting bolt in the mounting hole, and the lower portion of the module side plate 130 is connected with the lower cover plate 120 by welding or riveting. In order to close the openings at both ends, the casing 100 further includes two end plates disposed oppositely, a bus bar 141 is disposed between the end plates and the battery cells, a through hole for inserting and supporting an electrode of the battery cell is disposed on the bus bar 141, the bus bar 141 is used for connecting and leading the electrodes of the plurality of battery cells to an output electrode, and a mounting portion for leading the output electrode out and thus connecting with an external electrical device is disposed on at least one of the two end plates.

The battery module is provided with the first limiting groove 111 and the second limiting groove 121 on the upper cover plate 110 and the lower cover plate 120 which are oppositely arranged, each battery cell unit 200 is respectively inserted into one first limiting groove 111 and the second limiting groove 121 corresponding to the first limiting groove 111, and the single battery cell unit 200 is fixed by the first limiting groove 111 and the second limiting groove 121, so that the installation stability of the battery cell unit 200 can be improved; simultaneously, even when electric core unit 200 takes place the inflation, when its bulging force conducts to adjacent electric core unit 200, can not promote adjacent electric core unit 200 and take place the displacement, also this bulging force can be born by first spacing groove 111 and second spacing groove 121, can not conduct to the module curb plate 130 of battery module along a plurality of electric core unit 200's the orientation of piling up, reduce the extrusion force that module curb plate 130 received, prevent that module curb plate 130 from taking place to break or drop, improve the safety in utilization of battery module.

As shown in fig. 2, a plurality of cell bodies 20 are inserted into each first limiting groove 111 and the corresponding second limiting groove 121, the cell bodies 20 form a cell unit 200, each cell unit 200 is inserted into one first limiting groove 111 and the corresponding second limiting groove 121, and a cell set is formed by a plurality of adjacent cell units 200. In this embodiment, two cell bodies 20 are inserted into each first limiting groove 111, and each two or four cell units 200 form a cell set. In other alternative embodiments, other numbers of the cell bodies 20 may be inserted into each of the first limiting grooves 111, or other numbers of the cell units 200 may form the cell set, and the selection of the specific number may be determined by the manufacturing requirement of the battery module by those skilled in the art, which is not limited in this embodiment.

Further, at least two adjacent cell units 200 are combined into a cell set, and an elastic member 160 is disposed between the two adjacent cell sets. This elastic component 160 can be when electric core unit 200 takes place the inflation on with expansion force conduction to elastic component 160, and can partially restrain electric core unit 200's inflation volume, make electric core unit 200 can not all be born by the module curb plate 130 of casing 100 because the huge expansion force that the inflation leads to, consequently module curb plate 130 can not appear because the too big module curb plate 130 that leads to of electric core unit 200 expansion force breaks, damage and phenomenon such as drop, the safety in utilization of battery module has been guaranteed.

Optionally, a spacer 210 is disposed between two adjacent cell units 200 and/or between the cell unit 200 and the elastic member 160. The spacer 210 may be an elastic spacer such as foam, felt, or rubber spacer, and not only can protect the side wall surface of the battery cell unit 200, but also can play a role in buffering. The spacer 210 is used for protecting the battery cell units 200 from being damaged by the elastic member 160, and can prevent the battery cell units 200 from being scratched by the elastic member 160, and meanwhile, the spacer 210 is arranged between the two battery cell units 200, so that a buffering effect can be achieved, damage caused by mutual rubbing between the two battery cell units 200 can be prevented, and the safety of the battery module in use can be improved.

In a preferred embodiment, the elastic member 160 is a spring, and the length of the spring is gradually increased from the center of the battery module to both sides. The spring is made of alloy steel, and has the advantages of easy processing and forming, low manufacturing cost, difficult failure and high reliability. Because inside electric core unit 200 of battery module takes place when the inflation, its total bulging force can outwards transmit in proper order and stack by battery module central authorities, lead to this bulging force to be crescent to both sides by battery module central authorities, consequently, length at the spring is by battery module central authorities to both sides gradual change long-term, can make inside electric core unit 200 of battery module's inflation volume and bulging force by in the battery module both sides, the longer spring of length bears, make the bulging force who transmits the battery module outside increase step by step, use longer spring to provide bigger buffer space, prevent the module curb plate 130 of the too big extrusion battery module of bulging force, the security when improving this battery module and using.

In another alternative embodiment, which is different from the above-described embodiment in that the lengths of the elastic members 160 are the same, and the elastic modulus of the elastic members 160 is gradually increased from both sides of the battery module toward the center. Same, because the bulging force of the inside electric core unit 200 of battery module is by battery module central authorities to both sides crescent, consequently when the elastic modulus at the spring is by battery module both sides to central authorities grow gradually, can make inside electric core unit 200 of battery module's bulging volume and bulging force by at battery module central authorities, the great spring of elastic modulus bears, make the bulging force who transmits the battery module outside degressive step by step, prevent the too big module curb plate 130 who extrudes the battery module of bulging force, the security when improving this battery module and using.

As shown in fig. 2 and 3, optionally, an insulating film is attached to the inner bottom surfaces of the first limiting groove 111 and the second limiting groove 121, and the insulating film is used for insulating the cell unit 200. The insulating film can be made of inorganic materials, such as silicon nitride, silicon oxide, aluminum oxide and the like, and the inorganic materials have the advantage of good mechanical strength and can be suitable for various severe conditions such as high temperature, high pressure and the like; the insulating film may be made of an organic material such as polyimide, polyethylene, polyvinylidene fluoride, polytetrafluoroethylene, etc., which has the advantages of easy molding and low cost, and can reduce the production cost.

As shown in fig. 3 and 4, the first limiting groove 111 is formed by fixing two groove side plates 1111 on the first mounting surface 1101, and the second limiting groove 121 is formed by fixing two groove side plates 1111 on the second mounting surface 1201, and in order to protect the side wall surfaces of the cell bodies 20, that is, the large surface of each cell body 20 is not scratched by the inner walls of the groove side plates 1111, protection pads are disposed between the side wall surfaces of the cell units 200, that is, the side wall surfaces of the two side walls in the stacking direction of the plurality of cell units 200, and the inner side wall surfaces of the first limiting groove 111 and the second limiting groove 121. This protection pad can be elastic gaskets such as bubble cotton, felt, rubber gasket, not only can play the effect of protection electric core unit 200's lateral wall face, can also play the cushioning effect, prevents that battery module from rocking time electric core unit 200 directly with groove curb plate 1111 collision, improve the safety in utilization of battery module.

As a preferred embodiment, the heights of the first and second position-limiting grooves 111 and 121 do not exceed 10% of the height of the battery cell 200. First spacing groove 111 and the second spacing groove 121 that set up like this, not only fixed electric core unit 200 effectual, the installation is firm, the phenomenon such as the installation of being not convenient for that the spacing groove set up the overlength and lead to, battery module total weight increase can not appear yet.

Further, the notches of the first and second limiting grooves 111 and 121 are provided with rounded corners. This fillet can reduce the notch department of first spacing groove 111 and second spacing groove 121 because burr, the sharp phenomenons such as fracture that machining leads to protect electric core unit 200 not damaged by the notch, the security when improving the battery module and using.

With continued reference to fig. 4, the housing 100 further includes a connecting beam 150 connecting the upper cover plate 110 and the lower cover plate 120. Also be provided with elastic component 160 between this tie-beam 150 and electric core unit 200, this tie-beam 150 can bear the partial pressure that comes from elastic component 160 for when battery module inside electricity core unit 200 takes place the inflation, the pressure that the inflation produced can not all be conducted to the module curb plate 130 of both sides, but the part is born by tie-beam 150, reduces the pressure that two module curb plates 130 bore, prevents that module curb plate 130 from being extruded to produce and breaking the damage.

Alternatively, the upper cover plate 110, the lower cover plate 120, and the connection beam 150 are integrally formed. Integrated into one piece's upper cover plate 110, lower cover plate 120 and tie-beam 150, its whole mechanical strength is higher, can bear bigger electric core bulging force for the reliability of battery module, security are higher. Of course, the upper cover plate 110, the lower cover plate 120 and the connection beam 150 may also be assembled together by welding or bolting, and the connection beam 150 is set to be a hollow structure, so that the housing 100 can reduce the difficulty of integral forming and processing, and can also reduce the quality of the housing 100, and in order to ensure the mechanical strength of the connection beam 150, a reinforcing rib may be disposed in the hollow cavity of the connection beam 150. This upper cover plate 110, lower cover plate 120 and tie-beam 150 are made by the aluminum alloy, and the aluminum alloy has mechanical strength height, the light advantage of quality, uses it in preparation module casing 100, can reduce battery module's whole quality, can also guarantee that casing 100 has sufficient mechanical strength to hold electric core unit 200.

Another object of the present invention is to provide an electronic device, which uses the battery module according to any of the above schemes, wherein the battery core of the battery module is not easy to displace and has stable performance, and the safety of the electronic device can be improved.

It is obvious that the above embodiments of the present invention are only 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 (12)

1. A battery module, comprising:

the device comprises a shell, a first positioning device and a second positioning device, wherein the shell comprises an upper cover plate and a lower cover plate which are oppositely arranged, the upper cover plate is provided with a first mounting surface opposite to the lower cover plate, the first mounting surface is provided with a plurality of first limiting grooves, the lower cover plate is provided with a second mounting surface opposite to the first mounting surface, the second mounting surface is provided with a plurality of second limiting grooves, and the first limiting grooves and the second limiting grooves are equal in number and are oppositely arranged one by one;

the battery cell comprises a plurality of battery cell units, wherein the battery cell units are stacked in the shell in parallel, and each battery cell unit is inserted into one first limiting groove and the second limiting groove opposite to the first limiting groove.

2. The battery module according to claim 1, wherein a protective pad is disposed between the cell unit side wall surface and the limiting groove inner side wall surface.

3. The battery module according to claim 1, wherein an insulating film is attached to the bottom surface inside the first limiting groove and/or the second limiting groove, and the insulating film is used for insulating the upper cover plate and/or the lower cover plate from the cell unit.

4. The battery module according to claim 1, wherein the height of each of the first and second retaining grooves does not exceed 10% of the height of the cell unit.

5. The battery module according to claim 1, wherein the notches of the first and second retaining grooves are provided with rounded corners.

6. The battery module according to any one of claims 1 to 5, wherein the case further comprises a connection beam connecting the upper and lower cover plates.

7. The battery module according to claim 6, wherein the upper cover plate, the lower cover plate, and the connection beam are integrally formed.

8. The battery module according to claim 1, wherein at least two adjacent cell units are combined into a cell set, and an elastic member is disposed between two adjacent cell sets.

9. The battery module according to claim 8, wherein a spacer is disposed between two adjacent cell units and/or between the cell unit and the elastic member.

10. The battery module according to claim 8, wherein the elastic member is a spring, and the length of the spring is gradually increased from the center of the battery module to both sides.

11. The battery module according to any one of claims 8 to 10, wherein the elastic member has a modulus of elasticity that gradually increases from both sides of the battery module toward the center.

12. An electronic device, characterized by comprising the battery module according to any one of claims 1 to 11.

Images