CN215184303U - End plate, battery case and battery module - Google Patents

Abstract

The utility model relates to the technical field of batteries, the utility model provides an end plate, battery case and battery module, above-mentioned end plate package rubbing board body and reinforcement, the reinforcement sets up in the middle part position of plate body fixedly, and the reinforcement extends along the width direction of plate body, through setting up the reinforcement in the middle part position of plate body fixedly, and make the reinforcement extend along the width direction of plate body, can effectively improve the structural strength of end plate, when battery case's tip receives external force extrusion, the reinforcement can bear partial extrusion force, thereby can effectively restrain the deformation range of end plate, and then can effectively improve battery case's anti extrusion ability, make the holding can effectively be protected in battery case's electric core group and/or utmost point ear support, the work security performance of battery module has been improved by a wide margin.

Description

End plate, battery case and battery module

Technical Field

The utility model relates to a battery technology field especially provides an end plate, battery case and battery module.

Background

The battery module is a core component in the power battery, generally comprises a battery core group and a battery shell, and the battery core group is accommodated in the battery shell to protect the battery core group.

Battery case usually includes casing and end plate, the end plate lid is located the port position of casing and is regarded as battery case's main load part, however, because the structural strength of traditional end plate is not enough, when battery case's tip received external force extrusion, the end plate appears great range easily and is out of shape, thus, lead to electric core in the electric core group to be damaged by the pressure easily on the one hand, on the other hand leads to the contact of utmost point ear or two adjacent busbar contacts of two adjacent electric cores in the electric core group easily, finally cause the short circuit accident, bring harmful effects for battery module's work safety performance.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an end plate, battery case and battery module, the not enough technical problem of structural strength who aims at solving current end plate.

In order to achieve the above object, the embodiment of the present invention adopts the following technical solutions: the utility model provides an end plate, is applied to battery module, and above-mentioned end plate includes plate body and reinforcement, and the reinforcement sets up in the middle part position of plate body fixedly to the width direction of reinforcement along the plate body extends.

The embodiment of the utility model provides an end plate has following beneficial effect at least: through setting up the reinforcement in the middle part position of plate body fixedly, and make the reinforcement extend along the width direction of plate body, can effectively improve the structural strength of end plate, when battery case's tip received external force extrusion, the reinforcement can bear partial extrusion force, thereby can effectively restrain the range of deformation of end plate, and then can effectively improve battery case's anti extrusion ability, make the electric core group and/or the utmost point ear support of holding in battery case effectively protected, the work security performance of battery module has been improved by a wide margin.

In one embodiment, the plate body is provided with a containing groove, and the reinforcing member is fixedly arranged in the containing groove.

Through adopting above-mentioned technical scheme, can effectively play the limiting displacement to the reinforcement, when battery case's tip received external force extrusion, can prevent effectively that the reinforcement from taking place to shift to ensure the work validity of reinforcement.

In one embodiment, the depth of the accommodating groove is 0.4 to 0.6 times of the thickness of the plate body.

Through adopting above-mentioned technical scheme, inject the degree of depth of storage tank in suitable within range, neither can lead to the structural strength of plate body to descend by a wide margin because the degree of depth of storage tank is too big, also can not lead to the thickness of reinforcement to reduce thereupon and make the intensity of reinforcement descend because of the degree of depth undersize of storage tank to can effectively guarantee the overall structure intensity of end plate.

In one embodiment, the end plate includes a plurality of reinforcing members, each of which is sequentially arranged at intervals in a height direction of the plate body, and/or a cross section of the reinforcing member is selected from one of a rectangle, a triangle, a trapezoid, a parallelogram, and a polygon.

By adopting the technical scheme, the structural strength of the end plate can be further improved, so that the deformation amplitude of the end plate can be further inhibited.

In one embodiment, the stiffeners are equally spaced.

Through adopting above-mentioned technical scheme, make the whole atress of end plate more even to can further improve the structural strength of end plate.

In one embodiment, the plate body has a first surface facing the battery cells of the battery module, and the reinforcing member is disposed on the first surface.

Through adopting above-mentioned technical scheme, can avoid the reinforcement to expose, can prevent on the one hand that the reinforcement from directly bearing external force extrusion and lead to its rapid deformation, on the other hand can effectively improve the impression degree of end plate.

In one embodiment, the plate body and the reinforcing member are both metal reinforcing members, and the reinforcing member is welded with the plate body.

Through adopting above-mentioned technical scheme, can effectively improve the plate body and the connection steadiness of reinforcement, when the end plate receives external force extrusion, can effectively prevent that the reinforcement from breaking away from the plate body to ensure the work validity of reinforcement.

In one embodiment, the reinforcement is selected from one of an aluminum alloy reinforcement, a steel reinforcement, or a titanium alloy reinforcement.

Through adopting above-mentioned technical scheme, can effectively guarantee the intensity performance of reinforcement.

In order to achieve the above object, the present invention also provides a battery case, which comprises a case body having a port and the above end plate, wherein the end plate cover is disposed at the port of the case body.

Structural strength of above-mentioned end plate is higher, correspondingly, battery case's after adopting above-mentioned end plate structural strength has also obtained promoting by a wide margin, and when battery case's tip received external force extrusion, its deformation range was less to can effectively protect electric core group not extruded by external force and cause the damage, can avoid the contact of the utmost point ear of two adjacent electric cores in the electric core group or two adjacent busbar contacts simultaneously, prevent short circuit accident and take place, can effectively improve battery module's work security performance.

In order to achieve the above object, the present invention also provides a battery module, which comprises a battery cell set and the above battery casing, wherein the battery cell set is accommodated in the battery casing.

When above-mentioned battery module receives external force extrusion, owing to adopted above-mentioned battery case to can effectively avoid the condition of thermal runaway to take place, effectively improve above-mentioned battery module's operational safety performance.

Drawings

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

Fig. 1 is a schematic structural diagram of an end plate according to an embodiment of the present invention;

fig. 2 is an exploded view of the end plate shown in fig. 1.

Wherein, in the figures, the respective reference numerals:

100. the plate comprises an end plate, 110, a plate body, 111, a containing groove, 112, a first surface, 113, a second surface, 114, a bottom plate, 115, a main body, 116, a mounting portion, 1161, a connecting hole, 120 and a reinforcing piece.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "length", "width", "height", "upper", "lower", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being 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", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

First, the X-axis direction shown in fig. 1 and 2 is the width direction of the following end plate 100, that is, the width direction of the following battery case, the Y-axis direction is the thickness direction of the following end plate 100, that is, the length direction of the following battery case, and the Z-axis direction is the height direction of the following end plate 100, that is, the height direction of the following battery case.

A battery module comprises a battery core group and a battery shell, wherein the battery core group is accommodated in the battery shell. The battery core group comprises a plurality of battery cells, and the battery cells are sequentially stacked, for example, the battery cells are sequentially stacked along the width direction X of the battery shell; for another example, each battery cell is stacked in sequence along the length direction Y of the battery case. The battery cell can be a soft-package battery cell or an aluminum shell battery cell.

The battery module can be applied to an electric device such as an electric vehicle or an electric bicycle.

The battery case includes an end plate 100 and a case having a port, and the end plate 100 covers the port of the case.

It should be noted that, according to different types of battery cells, the housing may have one port or two ports;

specifically, for a soft package battery cell with a tab led out from only one end, the above-mentioned housing may have only one port, and accordingly, the battery case also includes only one end plate 100, and the end plate 100 is covered on the port of the housing;

for the soft package battery cell with the tabs led out from both ends, the casing may have two oppositely disposed ports, and it can be understood that the two ports of the casing are oppositely disposed along the length direction Y of the battery casing, accordingly, the battery casing includes two end plates 100, one end plate 100 is covered on one port of the casing and the other end plate 100 is covered on the other port of the casing.

For the aluminum-shell battery core, the shell may be provided with one port or two ports according to actual needs, and details are not described here.

The above-described end plate 100 will be described in detail with reference to the accompanying drawings.

Referring to fig. 1 and 2, an end plate 100 includes a plate body 110 and a reinforcing member 120, wherein the reinforcing member 120 is fixedly disposed at a middle position of the plate body 110, and the reinforcing member 120 extends in a width direction X of the plate body 110.

It should be noted that, an intersection point of a center line of the plate body 110 along the width direction X and a center line of the reinforcement member 120 along the height direction Z is defined as a first intersection point, and an intersection point of a center line of the reinforcement member 120 along the width direction X and a center line of the reinforcement member along the height direction Z is defined as a second intersection point, and the middle position is a position where a projection of the first intersection point along the thickness direction Y of the end plate 100 coincides with a projection of the second intersection point along the thickness direction Y of the end plate 100.

It is to be understood that the cross-section of the stiffener is selected from one of rectangular, triangular, trapezoidal, parallelogram or polygonal; specifically, the reinforcing member 120 has a strip-shaped structure, such as a square-sheet structure; alternatively, the reinforcing member 120 has a columnar structure, such as a cylindrical structure or a square-column structure.

When traditional end plate is receiving external force extrusion, it is easy towards electric core direction bending deformation, especially to the middle part position of end plate 100, its deformation range generally is greater than the deformation range of other positions of end plate 100, end plate 100 after the deformation causes the extrusion to the electric core group in the casing, lead to electric core in the electric core group to receive the pressure damage easily on the one hand, on the other hand leads to the utmost point ear contact of two adjacent electric cores in the electric core group easily, and then cause the short-circuit accident, in addition, to the battery module who adopts soft package electricity core, because be equipped with utmost point ear support usually between electric core group and end plate 100, and be equipped with a plurality of busbars that are used for establishing ties each electric core of electric core group on the utmost point ear support, end plate 100 after the deformation extrudes each busbar and leads to two adjacent busbar contacts easily, also can cause the short-circuit accident.

Compared with the traditional end plate, the embodiment of the utility model provides an end plate 100 is through setting up reinforcement 120 in the middle part position of plate body 110 fixedly, and make reinforcement 120 extend along the width direction X of plate body 110, can effectively improve end plate 100's structural strength, when battery case's tip received external force extrusion, reinforcement 120 can bear partial extrusion force, thereby can effectively restrain end plate 100's deformation range, and then can effectively improve battery case's anti extrusion ability, make the electric core group and/or the utmost point ear support of holding in battery case can effectively be protected, the work safety performance of battery module has been improved by a wide margin.

Specifically, as shown in fig. 1 and fig. 2, the plate body 110 includes a bottom plate 114, a main body 115 disposed on the bottom plate 114, and two mounting portions 116 respectively disposed on two opposite sides of the main body 115 along the X-axis direction, the reinforcing member 120 is fixedly disposed at a middle position of the main body 115, and the two mounting portions 116 are connected to the case of the battery case.

Specifically, to ensure that the plate body 110 has sufficient structural strength, the main body 115 may be of a solid structure;

alternatively, to reduce the mass of the plate body 110, the main body 115 may have a hollow structure, for example, corners of the main body 115 may be hollow.

Specifically, as shown in fig. 1 and fig. 2, the two mounting portions 116 are both provided with a connecting hole 1161 extending along the Z-axis direction, and a fastening member is used to penetrate through the connecting hole 1161 and then connected to the housing, so as to connect and fix the housing and the end plate 100.

In the present embodiment, please refer to fig. 2, a receiving groove 111 is formed on the plate body 110, that is, the receiving groove 111 is formed on the main body 115 of the plate body 110, and the reinforcing member 120 is fixedly disposed in the receiving groove 111.

Through adopting above-mentioned technical scheme, can effectively play the limiting displacement to reinforcement 120, when the tip of battery case received external force extrusion, can effectively prevent that reinforcement 120 from taking place to shift and break away from plate body 110 to ensure reinforcement 120's work validity.

It can be understood that the receiving groove 111 extends along the width direction X of the board body 110, and the shape of the receiving groove 111 is adapted to the shape of the reinforcing member 120, that is, after the reinforcing member 120 is received in the receiving groove 111, the edge of the reinforcing member 120 is attached to the inner side wall of the receiving groove 111, so as to effectively limit the reinforcing member 120.

Specifically, the depth of the receiving groove 111 is 0.4 to 0.6 times the thickness of the plate body 110, and it can be understood that, in order to prevent the reinforcement 120 from protruding out of the surface of the plate body 110, the thickness of the reinforcement 120 may be equal to the depth of the receiving groove 111, that is, the thickness of the reinforcement 120 is also 0.4 to 0.6 times the thickness of the plate body 110, where the depth of the receiving groove 111 refers to the dimension of the receiving groove 111 along the Y-axis direction, the thickness of the reinforcement 120 refers to the dimension of the reinforcement 120 along the Y-axis direction, and the thickness of the plate body 110 refers to the dimension of the plate body 110 along the Y-axis direction.

Through adopting above-mentioned technical scheme, can inject the degree of depth and the thickness of reinforcement 120 of storage tank 111 in suitable within range, neither can lead to the structural strength of plate body 110 to descend by a wide margin because the degree of depth of storage tank 111 is too big, also can not lead to the thickness of reinforcement 120 to reduce thereupon and make the intensity of reinforcement 120 descend because the degree of depth of storage tank 111 is too little to can effectively guarantee the overall structure intensity of end plate 100.

Through test verification, when the depth of the accommodating groove 111 is 0.4 times of the thickness of the plate body 110, the strength of the plate body 110 cannot be greatly reduced due to grooving, and meanwhile, the thickness of the reinforcing piece 120 is 0.4 times of the thickness of the plate body 110, so that the strength of the reinforcing piece 120 can be effectively ensured, the reinforcing piece 120 is fixedly arranged behind the plate body 110, the structural strength of the end plate 100 can be effectively improved, and the deformation amplitude of the end plate 100 when being extruded by external force is restrained.

Of course, the depth of the receiving groove 111 and the thickness of the reinforcing member 120 may be set differently according to practical application requirements, for example, the depth of the receiving groove 111 and the thickness of the reinforcing member 120 are both 0.5 times of the thickness of the plate body 110; for another example, the depth of the receiving groove 111 and the thickness of the reinforcing member 120 are 0.6 times the thickness of the plate body 110, and are not limited herein.

In some examples, the reinforcing member 120 may also protrude from the surface of the board body 110, that is, the thickness of the reinforcing member 120 is greater than the depth of the receiving groove 111, for example, the depth of the receiving groove 111 is 0.4 times the thickness of the board body 110, and the thickness of the reinforcing member 120 is 0.5 times the thickness of the board body 110; for another example, the depth of the receiving groove 111 is 0.5 times the thickness of the plate body 110, and the thickness of the reinforcing member 120 is 0.6 times the thickness of the plate body 110.

In the present embodiment, please refer to fig. 1 and fig. 2, the end plate 100 includes a plurality of reinforcing members 120, and the reinforcing members 120 are sequentially spaced along the height direction of the plate body 110. The number of the reinforcing members 120 may be set according to the size of the end plate 100, such as three, five, etc., and is not particularly limited herein.

By adopting the above technical solution, when the end plate 100 is pressed by an external force, the plurality of reinforcing members 120 bear the pressing force together, and the structural strength of the end plate 100 can be further improved, so that the deformation amplitude of the end plate 100 can be further suppressed.

Specifically, the respective reinforcing members 120 are arranged at equal intervals. The distance between two adjacent reinforcing members 120 may be set according to the height dimension of the plate body 110, for example, the distance between two adjacent reinforcing members 120 is 0.1 times the height of the plate body 110; for another example, the distance between two adjacent reinforcing members 120 is 0.05 times the height of the plate body 110, and is not particularly limited herein.

By adopting the technical scheme, the whole stress of the end plate 100 is more uniform, so that the structural strength of the end plate 100 can be further improved.

Specifically, referring to fig. 1 and 2, at least one reinforcing member 120 is disposed at a middle position of the plate body 110, and it can be understood that other reinforcing members 120 are respectively disposed at two opposite sides of the reinforcing member 120 at the middle position of the plate body 110, and form a symmetrical arrangement structure with a center line of the plate body 110 along the X-axis direction as a symmetry axis.

In this embodiment, please refer to fig. 1 and fig. 2, the plate 110 has a first surface 112 facing the battery core of the battery module and a second surface 113 facing the outside, that is, the first surface 112 and the second surface 113 are disposed opposite to each other, and the reinforcing member 120 is disposed on the first surface 112.

By adopting the above technical scheme, the reinforcing member 120 can be prevented from being exposed, on one hand, the reinforcing member 120 can be prevented from directly bearing external force extrusion to cause rapid deformation, and on the other hand, the appearance sensitivity of the end plate 100 can be effectively improved.

In the present embodiment, the plate body 110 and the reinforcing member 120 are both metal reinforcing members, and the reinforcing member 120 is welded to the plate body 110. Specifically, the plate body 110 may be directly welded to the reinforcing member 120, or the plate body 110 may be formed into the receiving groove 111 through a casting process or a die-casting process, and the reinforcing member 120 is received in the receiving groove 111 and then welded to the plate body 110, so as to fixedly connect the plate body 110 and the reinforcing member 120.

By adopting the technical scheme, the connection stability of the plate body 110 and the reinforcing piece 120 can be effectively improved, and when the end plate 100 is extruded by external force, the reinforcing piece 120 can be effectively prevented from being separated from the plate body 110, so that the working effectiveness of the reinforcing piece 120 is ensured.

Specifically, the plate body 110 is made of a metal material different from that of the reinforcing member 120, for example, the plate body 110 is made of an aluminum material, and the reinforcing member 120 is made of a steel material; for another example, the plate body 110 is made of aluminum, and the reinforcing member 120 is made of titanium alloy.

In some examples, the plate body 110 may also be made of a non-metal material, for example, the plate body 110 is made of plastic, and the reinforcement member 120 is made of a metal material, in which case, the plate body 110 may be formed into the receiving groove 111 through an injection molding process, and the reinforcement member 120 is fixedly disposed in the receiving groove 111; alternatively, the plate body 110 and the reinforcement member 120 are integrally formed through an injection molding process, i.e., the reinforcement member 120 is completely embedded inside the plate body 110.

In this embodiment, the reinforcing member 120 is made of aluminum alloy, and because the aluminum alloy has high strength, the reinforcing member 120 is effectively prevented from being deformed to a large extent when being extruded by an external force, so that the structural strength of the end plate 100 can be effectively improved, the deformation of the end plate 100 can be effectively suppressed, and the aluminum alloy has light weight, so that the mass of the battery case can be effectively reduced, and the energy density of the battery module can be improved;

or, the reinforcing member 120 is made of steel, and because the strength of the steel is high, the reinforcing member 120 is effectively prevented from being deformed to a large extent when being extruded by an external force, so that the structural strength of the end plate 100 can be effectively improved, and the deformation amplitude of the end plate 100 can be effectively suppressed. Specifically, the reinforcing piece is made of stainless steel, and the stainless steel has high strength and good corrosion resistance;

or, the reinforcing member 120 is made of a titanium alloy, and the titanium alloy has excellent strength, so that the reinforcing member 120 is effectively prevented from being deformed to a large extent when being extruded by an external force, and thus the structural strength of the end plate 100 can be effectively improved, and the deformation extent of the end plate 100 can be effectively suppressed.

Of course, the reinforcing member 120 may be made of other high-strength materials, such as magnesium alloy, and the like, and is not particularly limited herein.

Through the test verification, under the same conditions, compare with traditional end plate 100, the utility model provides a maximum extrusion force that end plate 100 can bear has promoted about 10KN, and is visible, the utility model provides an end plate 100 has higher structural strength, and battery case makes each electric core homoenergetic in arranging battery case in effectively protect owing to adopted this end plate 100 to can effectively improve the work safety performance of battery module.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. The utility model provides an end plate, is applied to battery module, its characterized in that: the end plate comprises a plate body and a reinforcing piece, wherein the reinforcing piece is fixedly arranged in the middle of the plate body, and extends along the width direction of the plate body.

2. The end plate of claim 1, wherein: the plate body is provided with a containing groove, and the reinforcing piece is fixedly arranged in the containing groove.

3. The end plate of claim 2, wherein: the depth of the containing groove is 0.4-0.6 times of the thickness of the plate body.

4. The end plate of claim 1, wherein: the end plate comprises a plurality of reinforcing pieces, and the reinforcing pieces are sequentially arranged at intervals along the height direction of the plate body.

5. The end plate of claim 4, wherein: the reinforcing parts are arranged at equal intervals, and/or the cross section of the reinforcing parts is selected from one of rectangle, triangle, trapezoid, parallelogram or polygon.

6. The end plate of claim 1, wherein: the plate body is provided with a first surface facing to a battery core of the battery module, and the reinforcing piece is arranged on the first surface.

7. The end plate of any of claims 1-6, wherein: the plate body with the reinforcement is the metal reinforcement, the reinforcement with the plate body welds mutually.

8. The end plate of any of claims 1-6, wherein: the reinforcement is selected from one of an aluminum alloy reinforcement, a steel reinforcement, or a titanium alloy reinforcement.

9. A battery housing, characterized by: the battery case includes a case body having a port and the end plate of any one of claims 1 to 8, the end plate being provided to the port of the case body.

10. A battery module, its characterized in that: the battery module comprises a battery pack and the battery shell as claimed in claim 9, wherein the battery pack is accommodated in the battery shell.

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