CN218039462U - Battery case and battery - Google Patents

Abstract

The utility model discloses a battery case and battery. The battery shell comprises a shell body, wherein the shell body is sleeved outside the core bag and comprises at least two shell sections, each shell section is of a hollow structure, all the shell sections are sequentially arranged along the length direction of the shell body, the opposite ends of the two adjacent shell sections are spliced ends, the spliced ends are provided with first openings communicated with the inside of the shell sections, and the spliced ends of the two adjacent shell sections are fixed. Divide the longer shell body of length to cut into the shorter shell segmentation of two at least lengths, during the assembly battery, can overlap in proper order with all shell segmentation and establish the core package periphery, with two adjacent segmented concatenation end fixed connection of shell again, need not lift the core package and insert the inside of shell body, prevent the length overlength of shell body and restrict the core package and go into the shell, be favorable to prolonging the degree of battery, guarantee that the quality of battery is not influenced.

Description

Battery case and battery

Technical Field

The utility model relates to the technical field of batteries, especially, relate to a battery case and contain this battery case's battery.

Background

At present, in the fields of power automobiles, energy storage power stations and the like, a battery module with large capacity is generally required to be used as a power supply. The battery module includes a plurality of batteries, and the battery includes core package and is used for holding the aluminum hull of core package, for optimizing battery module space better, can be flat long form with the core package design in the battery, and battery shell also sets up to the flat long form with the core package adaptation, during the concrete assembly battery, inserts the core package to the inside of aluminum hull, and this kind of battery shell exists following not enoughly: when the core package is longer, the length of aluminum hull is also longer, because the core package is soft to collapse, it is great to insert the core package to the inside degree of difficulty of aluminum hull to being inserting the core package and entering the shell, the core package can bump with the aluminum hull and lead to the unsmooth surface of core package, influence the quality of battery.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an: a battery shell and a battery are provided, which can reduce the difficulty of the core package entering the shell and prevent the quality of the battery from being influenced.

In order to achieve the purpose, the utility model adopts the following technical proposal:

on the one hand, provide a battery case body, establish the outside shell body of core package including the cover, the shell body includes two at least shell subsections, every the shell subsection is hollow structure, all the shell subsection is along the length direction of shell body arranges in proper order, adjacent two just right one end of shell subsection is the concatenation end, the concatenation end be provided with the first opening of the inside intercommunication of shell subsection, and adjacent two the shell subsection the concatenation is fixed.

As a preferable technical solution of the battery case, the splicing ends of two adjacent case segments are welded and fixed.

As a preferable technical solution of the battery case, an insertion portion is convexly provided on an end surface of one of the splicing ends of two adjacent shell segments, the insertion portion extends along a length direction of the shell body, and the insertion portion can be inserted into the first opening of the other splicing end fixed to each other.

As a preferable technical solution of the battery case, an abutting surface is arranged on the periphery of the insertion portion, the abutting surface abuts against an inner side wall of the first opening into which the insertion portion is inserted, the abutting surface is arranged in an inclined manner, a vertical distance between one end of the abutting surface connected with the splicing end and a center line of the shell segment is L1, a vertical distance between one end of the abutting surface far away from the splicing end and a center line of the shell segment is L2, and L1 is greater than L2.

As a preferable technical solution of the battery case, the abutting surface is welded to the splicing end into which the insertion part is inserted.

As a preferable technical solution of the battery case, a position where the insertion part is connected to the splicing end has a limit step surface, and an end of the splicing end, through which the insertion part is inserted, can abut against the limit step surface.

As a preferred technical solution of the battery case, the insertion part is positioned on the splicing end for the insertion part to be inserted through a positioning member, the positioning member includes a positioning groove and a positioning protrusion capable of matching with the positioning protrusion inside the positioning groove, the positioning protrusion surrounds the outer peripheral surface of the insertion part, the positioning protrusion extends and protrudes toward the vertical direction of the central axis of the shell segment, and the positioning groove is recessed in the inner side wall of the first opening for the insertion part to be inserted.

As a preferable technical solution of the battery case, a plurality of reinforcing ribs are further provided on an inner side surface of the insertion part, the plurality of reinforcing ribs are distributed at intervals around a central axis of the case segment, and each reinforcing rib extends along a length direction of the case body.

As a preferable technical solution of the battery case, at least one of the case segments located at both ends of the case body in the length direction is provided with a second opening, the second opening is communicated with the inside of the case segment, the second opening deviates from the first opening, and the second opening is sealed by a top cover.

In a second aspect, a battery is also provided, which includes a casing and a core package, wherein the core package is accommodated inside the casing, and the casing is the above battery casing.

The utility model has the advantages that: divide the longer shell body of length to cut into the shorter shell segmentation of two at least lengths, during the assembly battery, can overlap in proper order with all shell segmentation and establish the core package periphery, need not lift the core package and insert the inside of shell body with the concatenation end fixed connection of two adjacent shell segmentation again, reduced the degree of difficulty that the core package inserted the shell. Because the core package has certain soft degree of collapsing, if with the longer core package of length lift up insert to the shell originally internal, thereby the core package collides the shell body easily and leads to the core package surface to appear unevenness's phenomenon when going into the shell, the battery case of this kind of structure can prevent that the length overlength of shell body from and restricting the core package and going into the shell, is favorable to prolonging the degree of battery, guarantees that the quality of battery is not influenced.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Fig. 1 is a structural view of a battery according to an embodiment.

Fig. 2 is an exploded view of the battery according to the embodiment.

Fig. 3 is an enlarged view of a in fig. 2.

Fig. 4 is a partial sectional view of another embodiment of one of two shell segments secured to each other.

Fig. 5 is a partial cross-sectional view of yet another embodiment of one of two shell segments secured to one another.

Fig. 6 is a partial cross-sectional view of yet another embodiment of one of two shell segments spliced to each other.

Fig. 7 is a partial sectional view of another embodiment of another of two shell segments secured to each other.

In the figure:

100. a core package; 200. a top cover;

1. a housing body; 11. shell segmentation; 12. a first opening; 13. a plug-in part; 14. a second opening; 15. a limiting step surface; 16. a positioning projection; 17. a positioning groove; 18. and (5) reinforcing ribs.

Detailed Description

In order to make the technical problems, technical solutions and technical effects achieved by the present invention more clear, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

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 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.

As shown in fig. 1 and 2, the utility model provides a battery case, establish at the outside shell body 1 of core package 100 including the cover, shell body 1 includes two at least shell segmentations, and every shell segmentation 11 is hollow structure, and all shell segmentation 11 are arranged along shell body 1's length direction in proper order, and two adjacent shell segmentation 11 just right one end are the concatenation end, and the concatenation end is provided with the first opening 12 with the inside intercommunication of shell segmentation 11, and two adjacent shell segmentation 11's concatenation end is fixed. Wherein, the shell body 1 is an aluminum shell. The ratio of the length of the shell body 1 to the length of the core package 100 is 0.8-1, and the ratio of the length of the battery cell to the energy density of the battery cell is 0.03-8.

In this embodiment, the ratio of the length of the case body 1 to the length of the core pack 100 is 0.9. In other examples, the ratio of the length of the shell body 1 to the length of the core pack 100 may be 0.8, 0.9 or 1, or any value within a range of 0.80 to 1, and the ratio of the length of the shell body 1 to the length of the core pack 100 is not particularly limited herein

In this embodiment, the ratio of the cell length to the cell energy density is 1, and in other examples, the ratio of the length of the case body 1 to the length of the core pack 100 may also be 0.03, 1, 3, 5, 6, or 8, or any value within a range of 0.03 to 8, and the ratio of the cell length to the cell energy density is not specifically limited herein.

Divide the longer shell body 1 of length to cut into the shorter shell segmentation 11 of at least two lengths, during the assembly battery, can establish core package 100 periphery with all shell segmentation 11 covers in proper order earlier, again with the concatenation end fixed connection of two adjacent shell segmentation 11, need not lift core package 100 and insert the inside of shell body 1, reduced the degree of difficulty of core package 100 income shell. Because core package 100 has certain soft degree of collapsing, if lift core package 100 that length is longer and insert to shell body 1 in, thereby core package 100 collides shell body 1 easily and leads to core package 100 surface unevenness's phenomenon to appear when going into the shell, and the battery case of this kind of structure can prevent that shell body 1's length overlength from and limiting core package 100 to go into the shell, is favorable to the degree of extension battery, guarantees that the quality of battery is not influenced.

Wherein, the concatenation end welded fastening of two adjacent shell subsections 11, the concatenation end of two adjacent shell subsections 11 is fixed through the welded mode, and this kind of fixed mode connection is reliable difficult for separating, guarantees battery case's quality. In other embodiments, the joining ends of two adjacent shell segments 11 can also be fixed in other ways, for example by adhesive or screw-fastening.

Referring to fig. 2 and 3, in order to reduce the difficulty in fixing two adjacent shell segments 11, an end face of one splicing end of the two adjacent shell segments 11 is convexly provided with a plug-in part 13, the plug-in part 13 extends along the length direction of the shell body 1, and the plug-in part 13 can be inserted into a first opening 12 of the other splicing end fixed to each other. The inserting part 13 is inserted into the first opening 12 of the splicing end fixed to each other, and the two adjacent shell sections 11 are spliced by the inserting part 13 to provide a guiding effect, so that the two shell sections 11 are quickly spliced in place.

Further, referring to fig. 4, the outer periphery of the insertion portion 13 has an abutting surface, the abutting surface abuts against the inner side wall of the first opening 12 into which the insertion portion 13 is inserted, the abutting surface is obliquely arranged, the perpendicular distance between one end of the abutting surface connected with the splicing end and the center line of the shell segment 11 is L1, the perpendicular distance between one end of the abutting surface far away from the splicing end and the center line of the shell segment 11 is L2, L1 is greater than L2, and the abutting surface is inclined, so that the insertion portion 13 can be tightly inserted into the first opening 12 of the splicing end into which the insertion portion 13 is inserted, and the smooth insertion of the insertion portion 13 in place is ensured.

It can be understood that, because the thickness of the sidewall of the shell body 1 is generally small, the welding space between two adjacent shell segments 11 is very limited, in order to provide a sufficient welding area between two adjacent shell segments 11 and ensure the connection strength of two adjacent shell segments 11, the abutting surface is welded to the splicing end where the splicing part 13 is inserted, and the abutting surface provides a welding space for two shell segments 11, so that the two shell segments 11 are tightly connected.

Referring to fig. 4, a position where the insertion part 13 is connected to the splicing end is provided with a limiting step surface 15, an end part of the insertion part 13 inserted into the splicing end can abut against the limiting step surface 15, when the insertion part 13 is inserted into the first opening 12 of the splicing end opposite to the insertion part, external force pushes and changes the depth of the insertion part 13 inserted into the first opening 12 until the end part of the splicing end where the insertion part 13 is inserted abuts against the limiting step surface 15, the insertion depth of the insertion part 13 can be limited by the limiting step surface 15, and the insertion part 13 can be inserted in place. When the end of the inserting portion 13 abuts against the limiting step surface 15, it indicates that the inserting portion 13 is inserted in place, and in specific implementation, the end surface of the splicing end where the inserting portion 13 is inserted is welded to the limiting step surface 15 after the inserting portion 13 is inserted in place.

In an embodiment, referring to fig. 5 and 7, the insertion portion 13 is positioned at the splicing end for insertion by a positioning member, the positioning member includes a positioning groove 17 and a positioning convex portion 16 capable of being engaged with and clamped inside the positioning groove 17, the positioning convex portion 16 surrounds the outer circumferential surface of the insertion portion 13, the positioning convex portion extends and protrudes toward the vertical direction of the central axis of the shell segment 11, and the positioning groove 17 is recessed in the inner side wall of the first opening 12 for insertion of the insertion portion 13. This design, with grafting portion 13 grafting to the inside back of corresponding first opening 12, can carry out assistance-localization real-time to grafting portion 13 in positioning groove 17 through location convex part 16 joint, the skew takes place for the position of grafting portion 13 during the welding. In addition, the arrangement of the buckling convex part 16 can also enhance the structural strength of the insertion part 13, enhance the external force resistance of the insertion part 13 and prevent the deformation or fracture of the insertion part 13 caused by external force.

In another embodiment, referring to fig. 6, a plurality of reinforcing ribs 18 are further disposed on the inner side surface of the insertion portion 13, the plurality of reinforcing ribs 18 are distributed at intervals around the central axis of the shell segment 11, each reinforcing rib 18 extends along the length direction of the shell body 1, the shell body 1 is usually an aluminum shell, the structural strength of the shell body 1 made of the material is poor, the insertion portion 13 is easily deformed by external force, and the structural strength of the insertion portion 13 can be further enhanced by the reinforcing ribs 18. Because the reinforcing rib is positioned on the upper inner side surface of the insertion part 13, the fixed connection between the insertion part 13 and the insertion end for the insertion of the insertion part is not influenced.

In this example, the shell body 1 has three shell segments 11, and all the shell segments 11 are respectively arranged in sequence in the length direction of the shell body 1, in practical implementation, the number of the shell segments 11 may be set according to requirements, for example, the number of the shell segments 11 is set to be two, four, or five, etc.

In this embodiment, referring to fig. 1 and 2, two shell segments 11 located at two ends of the shell body 1 in the length direction are both provided with a second opening 14, the second opening 14 is communicated with the inside of the shell segment 11, the second opening 14 is away from the first opening 12, the second opening 14 is blocked by a top cover 200, the shell body 1 with such a structure is adapted to the situation that the opposite two ends of the core package 100 respectively have tabs, the negative connection end of one top cover 200 is electrically connected with the negative tab of the core package 100, and the positive connection end of the other top cover 200 is electrically connected with the positive tab of the core package 100.

For the core package 100 with the tab led out only at one end, one end of one of the shell segments 11 located at the two ends of the shell body 1 in the length direction, which is away from the first opening 12, may be provided with one second opening 14, and one end of the other shell segment 11, which is away from the first opening 12, is not provided with an opening (that is, the other shell segment 11 is in a structure with one open end and the other closed end), and when the top cover 200 blocks the second opening 14, the positive connection end and the negative connection end of the same top cover 200 are respectively electrically connected with the positive tab and the negative tab of the core package 100.

In still another embodiment, a battery is further provided, referring to fig. 1 and fig. 2, including a housing and a core package 100, where the housing is the battery housing mentioned in any one of the above embodiments. Divide the longer shell body 1 of length to two at least short shell segmentation 11 of length, during the assembly battery, can establish core package 100 periphery with all shell segmentation 11 covers in proper order earlier, and the tip concatenation of the concatenation end of two adjacent shell segmentation 11 is fixed again, need not lift core package 100 and insert the inside of shell body 1, has reduced the degree of difficulty of core package 100 income shell. Because core package 100 has certain soft degree of collapsing, if lift core package 100 that length is longer and insert to shell body 1 in, thereby core package 100 collides shell body 1 easily and leads to core package 100 surface to appear unevenness's phenomenon when going into the shell, and the battery case of this kind of structure can prevent that shell body 1's length overlength from and restricting core package 100 to go into the shell, is favorable to the degree of extension battery to guarantee that the quality of battery is not influenced.

In another embodiment, a process for assembling a battery is provided, in which a core pack 100, a top cover 200 and a battery case mentioned in any of the above embodiments are provided, and the process includes the following steps:

step S10, fixing the core pack 100. In this step, the core package 100 is fixed on the tool, and preparation is made for the shell segment 11 to be sleeved on the periphery of the core package 100.

Step S20, connecting the top cover 200 to the positive tab and/or the negative tab at one end of the core pack 100;

step S30, sleeving all the shell segments 11 in the battery shell sequentially from the other end of the core package 100 to the periphery of the core package 100, moving all the shell segments 11 outside the core package 100 towards the top cover 200, and then welding the two adjacent shell segments 11, so that all the shell segments 11 are welded into an integral shell body.

According to the assembly process of the battery, all the shell segments 11 are sleeved outside the core package 100, all the shell segments 11 are moved to preset positions and are spliced and fixed to two adjacent shell segments 11, all the shell segments 11 are welded into the integral shell body 1, and then the top cover 200 is welded with the second opening 14 of the shell body to seal the second opening 14, so that the core package 100 and the shell body 1 are assembled through the assembly process without being influenced by the length of the core package 100, and the risk that the surface of the core package 100 is uneven during assembly of the core package 100 can be reduced.

In one embodiment, the battery assembling process further includes step S40 of welding the top cover 200 into the second opening 14 in the longitudinal direction of the case body to close the second opening 14.

For assembling such a battery, two top covers 200 need to be provided, in step S20, the negative electrode connecting end of one of the top covers 200 is electrically connected to the negative electrode tab on one end of the core pack 100, in step S30, after all the shell segments 11 are welded into the integral shell body 1, the positive electrode connecting end of the other top cover 200 is electrically connected to the positive electrode tab on the other end of the core pack 100, in step S40, the two top covers 200 are respectively welded in the two second openings 14 in the length direction of the shell body 1, so that the top covers 200 block the second openings 14. Alternatively, the order of electrical connection of the negative electrode connection end of the top cap 200 and the positive electrode connection end of the top cap 200 with the corresponding tabs may be interchanged.

For the core package 100 in which the positive electrode tab and the negative electrode tab are both disposed at the same end of the core package 100, only one second opening 14 is disposed at one end of the length direction of the case body 1 (that is, one of the case segments 11 at two ends of the length direction of the case body 1 is a structure with two open ends, and the other case segment 11 is a structure with one open end and the other closed end). When assembling such a battery, a top cover 200 is provided, in step S20, the negative electrode connection end and the positive electrode connection end of the top cover 200 are electrically connected to the positive electrode tab and the negative electrode tab of the core pack 100, and in step S30, after all the shell segments 11 are welded into the integrated shell body 1, the top cover 200 only needs to be welded in the second opening 14 at one end of the shell body 1 in the length direction, which is beneficial to reducing the assembling steps of the battery and improving the assembling efficiency of the battery.

For the core package 100 in which the positive tab and the negative tab are both disposed at the same end of the core package 100, and the two ends of the length of the case body 1 are provided with the second openings 14, for assembling such a battery, two top covers 200 need to be provided, in step S20, the negative connection end and the positive connection end of one of the top covers 200 are electrically connected with the positive tab and the negative tab of the core package 100, respectively, in step S40, the other top cover 200 is welded in the second opening 14 of the positive tab and the negative tab away from the core package 100, and the top cover 200 connected with the positive tab and the negative tab is welded in the second opening 14 close to the positive tab and the negative tab, so that the two second openings 14 are respectively sealed by the two top covers 200.

In the description herein, it is to be understood that the terms "upper", "lower", "left", "right", and the like are used in an orientation or positional relationship based on that shown in the drawings for convenience of description and simplicity of operation, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be in any way understood 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.

In the description herein, references to the description of "an embodiment," "an example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

Furthermore, it should be understood that although the specification describes embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and it will be understood by those skilled in the art that the specification as a whole and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

The technical principle of the present invention is described above with reference to specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without any inventive effort, which would fall within the scope of the present invention.

Claims (10)

1. The utility model provides a battery case, its characterized in that establishes the outside shell body of core package including the cover, the shell body includes two at least shell subsections, every the shell subsection is hollow structure, all the shell subsection is along the length direction of shell body arranges in proper order, adjacent two just right one end of shell subsection is the concatenation end, the concatenation end be provided with the first opening of the inside intercommunication of shell subsection, and adjacent two the shell subsection the concatenation is fixed.

2. The battery case as set forth in claim 1, wherein the spliced ends of adjacent two of said shell segments are welded and fixed.

3. The battery case according to claim 2, wherein an end surface of one of the splicing ends of two adjacent shell segments is protrudingly provided with a plugging portion extending along a length direction of the shell body, the plugging portion being capable of being plugged into the first opening of the other splicing end fixed to each other.

4. The battery case according to claim 3, wherein the insertion portion has an abutting surface at an outer periphery thereof, the abutting surface abuts against an inner side wall of the first opening into which the insertion portion is inserted, the abutting surface is disposed in an inclined manner, a vertical distance between an end of the abutting surface connected to the splicing end and a center line of the shell segment is L1, a vertical distance between an end of the abutting surface away from the splicing end and a center line of the shell segment is L2, and L1 > L2.

5. The battery case according to claim 4, wherein the abutting surface is welded to the splicing end into which the insertion part is inserted.

6. The battery shell according to claim 3, wherein the connecting position of the inserting part and the splicing end is provided with a limiting step surface, and the end part of the splicing end, on which the inserting part is inserted, can abut against the limiting step surface.

7. The battery shell as recited in claim 3, wherein the insertion part is positioned on the splicing end for insertion by a positioning element, the positioning element comprises a positioning groove and a positioning convex part which can be engaged and clamped in the positioning groove, the positioning convex part surrounds the outer circumferential surface of the insertion part, the positioning convex part extends and protrudes towards the vertical direction of the central axis of the shell segment, and the positioning groove is recessed in the inner side wall of the first opening for insertion of the insertion part.

8. The battery case of claim 3, wherein the inner side of the insertion portion further comprises a plurality of ribs spaced around the central axis of the shell segment, each rib extending along the length of the shell body.

9. The battery case according to any one of claims 1 to 8, wherein at least one of the case segments located at both ends in the longitudinal direction of the case body is provided with a second opening that communicates with the inside of the case segment, the second opening being apart from the first opening, the second opening being closed off by a top cover.

10. A battery comprising a case and a core pack, the core pack being contained inside the case, the case being the battery case according to any one of claims 1 to 9.

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