CN218498244U - Battery case, battery and high-capacity battery - Google Patents

Abstract

The utility model provides a battery case, battery and large capacity battery mainly solve current battery apron and battery box and have that the installation is complicated, the installation effectiveness is low, installation cost is high and the relatively poor problem of pressure-bearing nature. In the battery shell, convex edges with three edges are arranged under the inverted buckle of the battery box body among four edges of the battery cover plate, so that the battery cover plate is locked and matched with the battery box body in the Z direction and the X direction; the fourth lateral plate is connected with the battery cover plate through gluing, welding or pressing pieces, so that the battery cover plate is matched with the battery box body in a Y-direction locking mode. The utility model discloses battery case adopts the cooperation of chimb and back-off recess for the connection of battery apron, battery box is more reliable, has higher bearing capacity, has improved the security and the life of battery. Meanwhile, the mode has simple structure and convenient installation.

Description

Battery case, battery and high-capacity battery

Technical Field

The utility model belongs to the battery field, concretely relates to battery case, battery and large capacity battery.

Background

The application field of the lithium ion battery is very wide, and in recent years, with the further development of the lithium ion battery, a plurality of lithium ion batteries are assembled in parallel to form a high-capacity lithium battery, so that the high-capacity lithium battery is applied to the fields of energy storage, power batteries and the like. After the battery is assembled into a high-capacity lithium battery, the high-capacity lithium battery is packaged in a cavity formed by the cover plate and the box body, so that the battery is safe and reliable to use. However, how to achieve reliable packaging of large capacity batteries is a critical part. At present, a battery cover plate and a box body are connected through welding or through insulating glue and sealant.

Chinese patent application CN114171829A discloses a battery and a battery device, which includes a lower case and an upper case, the lower case and the upper case are sealed by welding, the sealing weld line is composed of at least two welding tracks arranged around the battery case, and the welding track of each side is a continuous straight line. In the battery structure, the lower shell and the upper shell are connected and sealed through welding. However, the connection method has the problems of complex process, low installation efficiency and the like, and meanwhile, the connection method has poor pressure bearing performance, and if the pressure inside the shell is high, the lower shell and the upper shell are expanded and deformed or even burst.

Chinese patent application CN216413134U discloses a packaging structure of a lithium battery, which includes a housing, a cover plate, two heat-conducting end plates and a battery cell. The shell is provided with an open slot penetrating through the shell, and the cover plate can be welded or glued on the shell to block the open slot. The cover plate is provided with a positive pole column and a negative pole column, the positive pole column is connected with a positive aluminum foil of the battery cell through a positive current collecting sheet, and the negative pole column is connected with a negative copper foil through a negative current collecting sheet. The battery cell is formed by stacking a plurality of thin full-lug rectangular winding cores. The two heat conduction end plates are respectively connected to openings at two ends of the open slot in a sealing manner so as to seal the opening. However, the cover plate and the shell in the structure are connected through welding or gluing, when the cover plate and the shell are connected through gluing, the technological requirement of the gluing is high, the yield is low, the installation cost is high, meanwhile, the curing time of the gluing is long, the installation efficiency is low, in addition, the pressure bearing performance of the connection mode is poor, and if the internal pressure is high, the shell and the cover plate have the defects of bulging deformation and even explosion.

Disclosure of Invention

For solving current battery apron and battery box and having that the installation is complicated, the installation effectiveness is low, installation cost is high and the relatively poor problem of pressure-bearing nature, the utility model provides a battery case, battery and large capacity battery.

In order to solve the above problem, the technical scheme of the utility model is as follows:

a battery shell comprises a battery cover plate, a battery box body and a pressing piece; the battery cover plate is a rectangular cover plate, the plane of the end face of the rectangular cover plate is an XY plane, and the direction perpendicular to the XY plane is a Z direction; convex edges are arranged on three side surfaces of the rectangular cover plate along the X direction and the Y direction; the battery box body is a rectangular box body and mainly comprises a first side plate, a second side plate, a third side plate and a fourth side plate which are arranged in a surrounding mode; the end faces of the side walls of the first side plate, the second side plate and the third side plate are provided with inverted grooves; three convex edges of the battery cover plate are respectively embedded and matched with the inverted grooves of the first side plate, the second side plate and the third side plate, so that the battery cover plate is locked and matched with the battery box body in the Z direction and the X direction; the fourth side plate is connected with the battery cover plate through gluing, welding or pressing pieces, so that the battery cover plate is matched with the battery box body in a Y-direction locking mode.

Furthermore, insulating sealant or sealant is filled in a gap between the convex edge and the inverted groove.

Furthermore, the insulating sealant or the sealant is one of two-component epoxy glue, two-component hard silica gel, two-component acrylate glue and two-component polyurethane glue, and a glue blocking strip is arranged on the contact surface of the battery cover plate and the battery box body and used for preventing the insulating sealant or the sealant from entering the cavity of the battery box body.

Further, the side wall end faces of the first side plate, the second side plate, the third side plate and the fourth side plate are also provided with vent holes for removing air bubbles in the insulating sealant or the sealant.

Further, the pressing piece comprises a U-shaped locking pressing plate and a jacking screw, a protruding portion is arranged on the fourth side plate, the protruding portion and the battery cover plate are arranged in an opening of the U-shaped locking pressing plate, and the jacking screw penetrates through one side plate of the U-shaped locking pressing plate and is tightly jacked with the protruding portion or the battery cover plate.

Furthermore, an insulating pad or an insulating layer is arranged on the side wall of the U-shaped locking pressing plate, which is in contact with the battery box body or the battery cover plate.

Further, the battery cover plate comprises an upper battery cover and a lower battery cover, the upper battery cover and the lower battery cover are respectively a positive pole and a negative pole of the battery, or the battery box body further comprises a bottom plate, the first side plate, the second side plate, the third side plate and the fourth side plate form a barrel structure with one open end, the battery cover plate is the positive pole or the negative pole, and the battery box body is the negative pole or the positive pole.

Furthermore, a plurality of stiffening ribs are arranged on the inner wall and the outer wall of the battery box body and used for increasing the pressure bearing capacity of the battery shell.

Further, be provided with a plurality of division boards in the battery box for the battery box separates for a plurality of cavitys, the height of division board is less than the height of battery box, makes by a plurality of partitioned cavitys intercommunication each other.

Further, the plurality of partition plates are arranged in parallel and equidistantly, so that the plurality of separated cavities have the same size.

Meanwhile, the utility model provides a battery, which comprises a battery cell and the battery shell; the battery core is arranged in the battery shell.

In addition, the utility model provides a large capacity battery, including a plurality of battery electricity core and above-mentioned battery case; a plurality of battery electric cores are arranged in parallel in the battery shell.

Compared with the prior art, the utility model discloses technical scheme has following advantage:

the utility model has the advantages that the battery cover plate and the battery box body are reliably connected through the reverse buckle, and among four sides of the connection of the battery cover plate and the battery box body, three sides are matched through the convex edge and the reverse buckle groove, so that the battery cover plate and the battery box body are locked and matched in the Z direction and the X direction; the fourth curb plate passes through gluing, welding or compresses tightly the piece with the battery apron and is connected for battery apron and battery box are in Y direction locking cooperation, the utility model discloses battery case adopts the cooperation of chimb and back-off recess, makes the connection of battery apron, battery box more reliable, and has higher bearing capacity, has improved the security and the life of battery. Meanwhile, the mode has simple structure and convenient installation.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

Fig. 1 is a first cross-sectional view of a battery case according to an embodiment of the present invention;

fig. 2 is a second cross-sectional view of the battery case according to the embodiment of the present invention;

fig. 3 is a first schematic structural diagram of a battery case according to an embodiment of the present invention;

fig. 4 is a second schematic structural diagram of a battery case according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a battery box in an embodiment of the present invention;

fig. 6 is a first schematic view illustrating the installation of the battery case and the battery cover plate according to the embodiment of the present invention;

fig. 7 is a second schematic view illustrating the installation of the battery case and the battery cover plate in the embodiment of the present invention;

fig. 8 is a diagram showing the relationship between the size of the battery cover plate and the size of the battery box in the embodiment of the present invention.

Reference numerals: 1-battery cover plate, 2-battery box body, 3-pressing piece, 4-insulating sealant, 5-adhesive blocking strip, 6-insulating pad or insulating layer, 11-convex edge, 12-battery upper cover, 13-battery lower cover, 14-convex part, 21-first side plate, 22-second side plate, 23-third side plate, 24-fourth side plate, 25-inverted groove, 26-vent hole, 27-separation plate, 31-U-shaped locking pressing plate and 32-tightening screw.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments. It should be understood by those skilled in the art that these embodiments are only used for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.

The utility model discloses a battery shell which is a drawer type inverted buckle locking and labyrinth glue filling sealing battery shell and is mainly applied to a lithium battery, and the battery shell mainly comprises a battery cover plate and a battery box body; the battery cover plate is arranged at the opening of the battery box body and forms a closed cavity with the battery box body; the reliable connection of the battery cover plate and the battery box body is the key for the reliable operation of the battery. The sealed cavity is used for installing and placing at least one battery cell and related accessories thereof, and the plurality of battery cells are arranged in parallel to form a large-capacity battery, so that the use requirements of different fields are met. Set up one or more battery electricity core in this battery case, when battery electricity core temperature rose or when taking place thermal runaway, battery apron, battery box can continue to keep good sealed and connected state for the battery can safe and reliable's use.

The battery cover plate of the utility model is a rectangular cover plate, the end surface plane of the rectangular cover plate is an XY plane, and the direction vertical to the XY plane is a Z direction; convex edges are arranged on three side surfaces of the rectangular cover plate along the X direction and the Y direction; the battery box body is a rectangular box body and is mainly formed by a first side plate, a second side plate, a third side plate and a fourth side plate in a surrounding mode, namely the battery box body is of an integrally formed structure and is formed by casting or extrusion; the end faces of the side walls of the first side plate, the second side plate and the third side plate are provided with inverted grooves; three convex edges of the battery cover plate are respectively embedded and matched with the inverted grooves of the first side plate, the second side plate and the third side plate, so that the battery cover plate is locked and matched with the battery box body in the Z direction and the X direction; the fourth lateral plate is connected with the battery cover plate through gluing, welding or pressing pieces, so that the battery cover plate is matched with the battery box body in a Y-direction locking mode. The utility model discloses battery case passes through the embedded cooperation of chimb and back-off recess to realize the reliable connection of battery apron and battery box, this structure is the structure of a simple, convenient installation, and when battery apron was connected with the battery box, only need with battery apron lock on the battery box, the adoption compress tightly an installation can, this mode has improved battery case's installation and the efficiency of dismouting, has saved installation time.

The utility model discloses a battery apron and battery box can adopt multiple mode to assemble, as long as three limits of assembly back battery apron and battery box be the back-off cooperation can, the three limit of battery apron all is compressed tightly by the battery box in the back-off recess of battery box promptly for the three limit of battery apron is restricted with the battery box in the motion of Z to. Specifically, the following assembly may be adopted. For example, the battery cover plate is inserted into the inverted groove of the battery box body along the Y direction, and the mode is convenient to mount; for another example, as shown in fig. 6 and 7, one edge of the battery cover plate is inserted into the inverted groove, then the other edge opposite to the edge is moved in a rotating manner by taking the edge of the edge as a rotating axis until the other edge falls into the groove opposite to the edge, and then the battery cover plate is moved in the Y direction to push the third edge into the groove corresponding to the third edge, which is suitable for the manner that the battery cover plate is connected with an internal device and must be installed from the Z direction.

As shown in fig. 8, in order to make the fitting of the battery cover plate and the battery case more reliable, the size between the battery cover plate and the battery case may satisfy the following condition: 1) H1> H4; 2) H2+ H3< H4; 3) The preferred size of H5 is 1 to 1.5MM, and the preferred size of H6 is 1.5 to 2MM. In principle, the smaller this dimension, H5 and H6, the better. The smaller the size, the better the rigidity of the battery case, but too small a potting compound may not be smooth and air bubbles may be trapped in the middle. And H6 is also distal, so H6 should be slightly larger than H5. In the above dimensions, H1 is the length of the back-off of the battery case, i.e. the depth of the back-off groove; h2 and H3 are the lengths of the battery cover plate inserted into the battery box body and the inverted buckle, or the lengths of the battery cover plate protruding edge and the inverted buckle edge of the battery box body in the height direction; h4 is the length dimension (X direction or Y direction) of the convex edge of the battery cover plate; h5 is a gap between the upper end surface of the convex edge of the battery cover plate and the upper end surface of the inverted groove of the battery box body in the height direction (Z direction); h6 is a gap between the lower end face of the convex edge of the battery cover plate and the lower end face of the inverted groove of the battery box body in the height direction (Z direction); meanwhile, in order to realize smooth glue filling, some diluents which do not influence the final form can be added during glue preparation; the harder the glue is, the better the glue is not crushed, so that the rigidity of the device is good and the structure is more stable.

The battery shell of the utility model ensures that three sides of the four sides of the battery cover plate are all under the back-off of the battery box body through the assembly sequence, thereby being locked in the height direction and the other horizontal direction; the installation gap between the battery cover plate and the battery box body is filled with sealing and locking glue, the filling glue has certain hardness, can bear internal and external pressure, has certain toughness, cannot be crushed or torn, and also needs to have good sealing property; specifically, the insulating sealant or the sealant is one of two-component epoxy glue, two-component hard silica gel, two-component acrylate glue and two-component polyurethane glue, and then a fourth edge of a battery cover plate of the battery is locked with a fourth side plate of the battery box body by a pressing plate; the small gap between the battery cover plate and the convex edge of the battery box body and the inverted groove ensures the stability of the battery cover plate when the battery cover plate is subjected to the internal expanding force of the battery box body, the battery cover plate is moved in a reciprocating mode before glue is not solidified, and more vent holes in the battery box body can effectively discharge larger bubbles in the sealed locking glue.

Example 1

As shown in fig. 1 to 5, the battery case provided by the present embodiment includes a battery cover plate 1 and a battery case 2; the battery box body 2 is of a structure with two open ends, the battery cover plates 1 are two, specifically, the battery upper cover 12 and the battery lower cover 13 are arranged at the two open ends of the battery box body 2 and form a closed battery shell structure with the battery box body 2. Or the battery box body is of a cylinder structure with one open end, and the battery cover plate and the battery box body form a closed battery shell structure. The closed cavity is used for installing and placing a plurality of battery cells and related accessories thereof, and the plurality of battery cells are connected in parallel to form a high-capacity battery.

The battery cover plate 1 in the embodiment is a rectangular cover plate, the plane of the end face of the rectangular cover plate is an XY plane, and the direction vertical to the XY plane is a Z direction; convex edges 11 are arranged on three side surfaces of the rectangular cover plate along the X direction and the Y direction; the battery box body 2 is a rectangular box body and mainly formed by a first side plate 21, a second side plate 22, a third side plate 23 and a fourth side plate 24 in an enclosing mode; the side wall end faces of the first side plate 21, the second side plate 22 and the third side plate 23 are provided with inverted grooves 25; three convex edges 11 of the battery cover plate 1 are respectively embedded and matched with the inverted buckle grooves 25 of the first side plate 21, the second side plate 22 and the third side plate 23, so that the battery cover plate 1 is locked and matched with the battery box body 2 in the Z direction and the X direction; the fourth side plate 24 is fixedly connected with the battery cover plate 1 by welding or gluing, so that the battery cover plate 1 is in locking fit with the battery case 2 in the Y direction.

If need guarantee good leakproofness between above-mentioned battery apron 1 and the battery box 2, need to have sealed glue at the clearance intussuseption of battery apron 1 and battery box 2 junction this moment, prevent that outside steam or impurity from getting into in the battery case. In addition, the side wall end surfaces of the first side plate 21, the second side plate 22, the third side plate 23 and the fourth side plate 24 are further provided with vent holes 26 for removing air bubbles in the sealant. Of course, the sealing can also be achieved by other manners, for example, a sealing groove is provided on the contact surface of the battery cover plate 1 and the battery case 2, a sealing gasket or a sealing strip is provided in the sealing groove, and the battery case 2 and the battery cover plate 1 are well sealed by the sealing gasket or the sealing strip.

Example 2

As shown in fig. 1 to 5, the battery case provided in the present embodiment includes a battery cover plate 1, a battery case 2, and a pressing member 3; this battery box 2 is both ends open-ended structure, and above-mentioned battery apron 1 is two, is battery upper cover 12 and battery lower cover 13 respectively, and battery upper cover 12 and battery lower cover 13 set up the opening part at battery box 2 both ends, form confined battery shell structure with battery box 2, should seal the cavity and be used for the installation and place a plurality of battery electricity cores and relevant annex, and a plurality of battery electricity cores connect the setting in parallel and form the large capacity battery.

The battery cover plate 1 is a rectangular cover plate, the plane of the end face of the rectangular cover plate is an XY plane, and the direction vertical to the XY plane is a Z direction; convex edges 11 are arranged on three side surfaces of the rectangular cover plate along the X direction and the Y direction; the battery box body 2 is a rectangular box body and mainly comprises a first side plate 21, a second side plate 22, a third side plate 23 and a fourth side plate 24 which are surrounded; the side wall end faces of the first side plate 21, the second side plate 22 and the third side plate 23 are provided with inverted grooves 25; three convex edges 11 of the battery cover plate 1 are respectively embedded and matched with the inverted buckle grooves 25 of the first side plate 21, the second side plate 22 and the third side plate 23, so that the battery cover plate 1 is locked and matched with the battery box body 2 in the Z direction and the X direction; the fourth side plate 24 and the battery cover plate 1 are pressed by the pressing member 3, so that the battery cover plate 1 and the battery case 2 are in locking fit in the Y direction.

In this embodiment, the pressing member 3 includes a U-shaped locking pressing plate 31 and a tightening screw 32, a protrusion 14 is disposed on the fourth side plate, the protrusion 14 and the battery cover plate 1 are disposed in an opening of the U-shaped locking pressing plate 31, and the tightening screw 32 penetrates through one side plate of the U-shaped locking pressing plate 31 and is tightened with the protrusion 14 or the battery cover plate 1. The side wall of the U-shaped locking pressing plate 31, which is contacted with the battery box body 2 or the battery cover plate 1, is provided with an insulating pad or an insulating layer 6.

The utility model discloses battery apron 1 includes battery upper cover 12 and battery lower cover 13, and battery upper cover 12 and battery lower cover 13 are the positive post and the negative pole post of battery respectively, and perhaps battery box 2 still includes the bottom plate, and bottom plate and first curb plate 21, second curb plate 22, third curb plate 23 and fourth curb plate 24 form the open tubular construction of one end, and the battery apron is positive post or negative pole post, and the battery box is negative pole post or positive post. If above-mentioned battery cover plate is electrically conductive, then need to realize the insulation treatment between battery cover plate 1 and the battery box 2, in this embodiment, the clearance intussuseption at the battery cover plate 1 and the battery box 2 junction is filled with insulating sealed glue 4, and the clearance intussuseption between chimb 11 and the back-off recess 25 is filled with insulating sealed glue 4 promptly, and at this moment, be provided with on the contact surface of battery cover plate 1 and battery box 2 and keep off adhesive tape 5 for prevent insulating sealed glue or sealed glue from getting into the cavity of battery box 2. At this time, the side wall end faces of the first side plate 21, the second side plate 22, the third side plate 23 and the fourth side plate 24 are further provided with vent holes 26 for removing air bubbles in the insulating sealant 4. Alternatively, the battery cover 1 and the battery case 2 may be insulated by other means, for example, an insulating layer is provided on the battery cover 1 to insulate the battery case 2.

The utility model discloses be provided with a plurality of stiffening ribs on battery box 2's the inner wall and the outer wall for promote battery case's bearing capacity. Simultaneously, still can be provided with a plurality of division boards 27 in battery box 2 for battery box 2 separates for a plurality of cavitys, and division board 27 highly is less than battery box 2's height, makes by a plurality of cavitys of divided intercommunication each other, and the pressure in a plurality of cavitys is the same after the intercommunication. The plurality of partition plates 27 are arranged in parallel and at equal intervals so as to be separated into a plurality of cavities with the same size, and the arrangement facilitates modular installation and disassembly.

Example 3

The present embodiment provides a battery, including a battery cell and the battery case in embodiment 1 or embodiment 2; the battery core is arranged in the battery shell. When the temperature of the battery electric core rises or thermal runaway occurs, the battery cover plate 1 and the battery box body 2 can continuously keep good sealing and connecting states, and the battery electric core has good bearing capacity, so that the battery can be used safely and reliably.

Example 4

The present embodiment provides a large-capacity battery, which includes a plurality of battery cells and the battery casing of embodiment 1 or embodiment 2, where the plurality of battery cells are arranged in parallel in the battery casing. When the temperature of the battery cell rises or thermal runaway occurs in the working process, the battery cover plate 1 and the battery box body 2 can continuously keep good sealing and connecting states, and the battery cell has good bearing capacity, so that a high-capacity battery can be used safely and reliably.

Claims (12)

1. A battery shell is characterized by comprising a battery cover plate and a battery box body;

the battery cover plate is a rectangular cover plate, the plane of the end face of the rectangular cover plate is an XY plane, and the direction perpendicular to the XY plane is a Z direction;

convex edges are arranged on three side surfaces of the rectangular cover plate along the X direction and the Y direction;

the battery box body is a rectangular box body and mainly comprises a first side plate, a second side plate, a third side plate and a fourth side plate which are arranged in a surrounding mode; the end faces of the side walls of the first side plate, the second side plate and the third side plate are provided with inverted grooves;

three convex edges of the battery cover plate are respectively embedded and matched with the inverted grooves of the first side plate, the second side plate and the third side plate, so that the battery cover plate is locked and matched with the battery box body in the Z direction and the X direction;

the fourth side plate is connected with the battery cover plate through gluing, welding or pressing pieces, so that the battery cover plate is matched with the battery box body in a Y-direction locking mode.

2. The battery case according to claim 1, wherein a gap between the flange and the undercut groove is filled with an insulating sealant or sealant.

3. The battery casing according to claim 2, wherein the insulating sealant or sealant is one of two-component epoxy glue, two-component hard silica gel, two-component acrylate glue and two-component polyurethane glue, and a glue blocking strip is arranged on a contact surface of the battery cover plate and the battery box body to prevent the insulating sealant or sealant from entering into a cavity of the battery box body.

4. The battery case according to claim 2, wherein the end surfaces of the side walls of the first side plate, the second side plate, the third side plate and the fourth side plate are further provided with vent holes for removing air bubbles in the insulating sealant or the sealant.

5. The battery shell according to any one of claims 1 to 4, wherein the compressing member comprises a U-shaped locking pressing plate and a tightening screw, a protrusion is arranged on the fourth side plate, the protrusion and the battery cover plate are arranged in an opening of the U-shaped locking pressing plate, and the tightening screw penetrates through one side plate of the U-shaped locking pressing plate and is tightened with the protrusion or the battery cover plate.

6. The battery shell according to claim 5, wherein the side wall of the U-shaped locking pressing plate, which is contacted with the battery box body or the battery cover plate, is provided with an insulating pad or an insulating layer.

7. The battery casing according to any one of claims 1 to 4, wherein the battery cover plate comprises an upper battery cover and a lower battery cover, the upper battery cover and the lower battery cover are respectively a positive pole and a negative pole of the battery, or the battery box further comprises a bottom plate, the bottom plate and the first side plate, the second side plate, the third side plate and the fourth side plate form a cylindrical structure with one end open, the battery cover plate is a positive pole or a negative pole, and the battery box is a negative pole or a positive pole.

8. The battery case according to any one of claims 1 to 4, wherein a plurality of stiffening ribs are provided on the inner wall and the outer wall of the battery case for increasing the pressure-bearing capacity of the battery case.

9. The battery shell according to any one of claims 1 to 4, wherein a plurality of partition plates are arranged in the battery box body, so that the battery box body is partitioned into a plurality of cavities, and the height of each partition plate is smaller than that of the battery box body, so that the partitioned cavities are communicated with each other.

10. The battery case of claim 9, wherein the plurality of separator plates are arranged in parallel and equidistant such that the plurality of partitioned cavities are the same size.

11. A battery comprising a battery cell and the battery housing of any one of claims 1 to 10; the battery cell is disposed within the battery housing.

12. A high capacity battery comprising a plurality of battery cells and the battery housing of any one of claims 1 to 10; a plurality of battery cells are arranged in parallel in the battery housing.

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