Battery shell and power battery

Abstract

The utility model discloses a battery shell and a power battery, and relates to the technical field of power batteries. The battery shell comprises a side shell made of an alloy material, a first panel and a second panel, the first panel is connected to one side of the side shell, the second panel is connected to the side, away from the first panel, of the side shell, the side shell comprises a first side plate, a bottom plate and a second side plate which are sequentially connected to form a U shape in a surrounding mode, and the bottom plate is connected with the second side plate. And the first panel and the second panel enclose to form an opening part. The battery shell solves the technical problem that the structural strength of the existing battery shell is insufficient.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of power battery, especially a battery shell and power battery. BACKGROUND

[0002] The existing power battery shell has certain limitation when forming, and the internal space cannot be increased, so the energy density of the battery cannot be increased, and the existing power battery adopts aluminum material, in the battery manufacturing process, the battery shell is used to support the top cover assembly, so that the structural strength of the current battery shell can be insufficient, and the problem of easy deformation exists. SUMMARY

[0003] Therefore, the utility model provides a battery shell and power battery, which solve the technical problem of insufficient structural strength of the existing battery shell.

[0004] In order to solve the above technical problem, the utility model adopts the following technical scheme:

[0005] A battery shell, the battery shell includes an alloy material side shell, a first panel and a second panel, the first panel is connected to one side of the side shell, the second panel is connected to the side of the side shell away from the first panel, the side shell includes a first side plate, a bottom plate and a second side plate connected in sequence to form a U-shaped enclosure, so as to form an opening part with the first panel and the second panel.

[0006] In some embodiments of the battery shell, a groove is formed on one side of the bottom plate facing the opening along the circumference of the bottom plate, the groove is formed on the outer edge of the bottom plate, and the first side plate and the second side plate are spaced apart from the side wall of the groove, the first panel and the second panel are connected to the groove bottom and are spaced apart from the side wall of the groove.

[0007] In some embodiments of the battery shell, the thickness of the bottom plate is not less than the thickness of the first side plate or the second side plate.

[0008] In some embodiments of the battery shell, the distance between one end of the first panel away from the bottom plate and the bottom plate is a first distance, the distance between one end of the second panel away from the bottom plate and the bottom plate is a second distance, and the first distance is equal to the second distance.

[0009] In some embodiments of the battery shell, the first panel has a plurality of first protrusions on one side relative to the second panel, the distance between each first protrusion and the bottom plate is equal, and each first protrusion is located at one end of the first panel away from the bottom plate.

[0010] And / or, a plurality of second protrusions are arranged on the side of the second panel opposite to the first panel, each of the second protrusions has an equal spacing from the bottom plate and is located at an end of the second panel away from the bottom plate.

[0011] To solve the above technical problems, the utility model adopts the technical scheme two:

[0012] A power battery comprises the battery shell in the above embodiment, and further comprises a top cover assembly and a battery cell.

[0013] In some embodiments of the power battery, the top cover assembly comprises:

[0014] A cover plate is arranged on the opening portion and is welded to the side wall of the battery shell, and a first through hole is arranged in the cover plate and penetrates the cover plate;

[0015] A lower plastic is arranged on the side of the cover plate facing the bottom plate, and a second through hole is arranged in the lower plastic;

[0016] A pole is arranged in the first through hole and the second through hole and is fixed to the cover plate after riveting;

[0017] An upper plastic is arranged on the side of the cover plate away from the bottom plate and has a pressing portion extending into the first through hole;

[0018] A sealing ring is arranged around the pole, and the sealing ring abuts against the pressing portion so as to be pressed during riveting.

[0019] In some embodiments of the power battery, an annular protrusion is arranged on the cover plate and surrounds the first through hole.

[0020] In some embodiments of the power battery, the annular protrusion is flush with the inner wall surface of the first through hole relative to the side wall surface of the pole.

[0021] In some embodiments of the power battery, a positioning column is arranged on the side of the cover plate away from the bottom plate, a positioning portion is arranged in the upper plastic and matches the positioning column, and the positioning portion is arranged around the positioning column.

[0022] The utility model has at least the following beneficial effects:

[0023] The battery shell is applied to a power battery, and the battery shell and the power battery have high structural strength, specifically, the battery shell is made of alloy material, the side shell is separated from the first panel and the second panel, and can be formed independently, so that the forming process is simplified, the structural strength is effectively improved, the weight can be borne, the technical problem of insufficient structural strength of the existing battery shell is solved, the strength between the battery shell and the top cover assembly can be improved during welding, the opening part is prevented from being deformed and sealed due to welding, and the opening part can be assembled with any form of top cover during installation of the top cover. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0025] Figure 1 It is a structural schematic view of the power battery in an embodiment;

[0026] Figure 2 It is a structural schematic view of the power battery in an embodiment; Figure 1

[0027] Figure 3 It is a structural schematic view of the power battery in an embodiment; Figure 2

[0028] Figure 4 It is a structural schematic view of the power battery in an embodiment;

[0029] Figure 5 It is a structural schematic view of the power battery in an embodiment; Figure 4

[0030] Figure 6 It is a structural schematic view of the power battery in an embodiment;

[0031] Figure 7 It is a structural schematic view of the power battery in an embodiment; Figure 6

[0032] Figure 8 It is a structural schematic view of the power battery in an embodiment;

[0033] Figure 9 It is a structural schematic view of the power battery in an embodiment.

[0034] Among them:

[0035] ​​​​1. Side shell; 11. First side plate; 12. Bottom plate; 121. Groove; 13. Second side plate; 2. First panel; 21. First protrusion; 3. Second panel; 31. Second protrusion; 41. Top cover assembly; 41. Cover plate; 411. Annular protrusion; 412. Positioning post; 42. Lower plastic; 43. End post; 44. Sealing ring; 45. Upper plastic; 451. Positioning part. Detailed Implementation

[0036] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model. However, this utility model can be implemented in many other different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0037] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0039] like Figures 1-9 As shown, in one embodiment of the battery casing, the battery casing includes a side shell 1 made of alloy material, a first panel 2 and a second panel 3. The first panel 2 is connected to one side of the side shell 1, and the second panel 3 is connected to the side of the side shell 1 away from the first flat plate. The side shell 1 includes a first side plate 11, a bottom plate 12 and a second side plate 13 connected in sequence in a U-shape to form an opening with the first panel 2 and the second panel 3.

[0040] In this embodiment, the battery casing is made of alloy material, and the side shell 1, the first panel 2, and the second panel 3 are separate and can be molded individually. This simplifies the molding process and effectively enhances the structural strength, enabling it to withstand heavier weights. This solves the technical problem of insufficient structural strength in existing battery casings. Furthermore, during welding, the strength between the casing and the top cover assembly 41 can be enhanced, preventing deformation and sealing failure of the opening due to welding. Additionally, when installing the top cover, it can be assembled with any type of top cover.

[0041] Specifically, the alloy material can be an alloy steel or an alloy aluminum. By using the alloy material, the structural strength is higher.

[0042] In one battery shell embodiment, as shown in Figure 4 and 5 , a groove 121 is formed on the side of the bottom plate 12 facing the opening along the circumference of the bottom plate 12, the groove 121 is formed on the outer edge of the bottom plate 12, and the first side plate 11 and the second side plate 13 are spaced apart from the side wall of the groove 121, and the first panel 2 and the second panel 3 are connected to the groove bottom of the groove 121 and are spaced apart from the side wall of the groove 121.

[0043] In this embodiment, by forming the groove 121, the bottom plate 12 can be thinned, the cost can be reduced, the overall shell structural strength can be improved, a higher weight can be borne, and the energy density can be improved, and damage to the battery cell caused by the transition element between the first side plate 11 and the second side plate 13 and the bottom plate 12 is avoided.

[0044] Specifically, first of all, it can be understood that the battery shell as a whole is enclosed by two side plates, two panels and a bottom plate 12, forming a rectangular box structure, the bottom plate 12 is a rectangular plate structure, and the groove bottom of the groove 121 extends to the outer edge of the bottom plate 12.

[0045] In one battery shell embodiment, as shown in Figure 4 and 5 , the thickness of the bottom plate 12 is not less than the thickness of the first side plate 11 or the second side plate 13.

[0046] In this embodiment, compared with the bottom plate 12, the thickness of the first side plate 11 and the second side plate 13 is small, which can form a four-side non-equal-thickness form, while ensuring the strength, meeting the performance requirements, and being beneficial to increasing the internal space and increasing the internal battery energy density.

[0047] In one battery shell embodiment, as shown in Figure 1 , Figures 6-8 , the distance between the end of the first panel 2 away from the bottom plate 12 and the bottom plate 12 is a first distance, the distance between the end of the second panel 3 away from the bottom plate 12 and the bottom plate 12 is a second distance, and the first distance is equal to the second distance.

[0048] In this embodiment, by setting the first distance and the second distance to be equal, better matching can be achieved, and specifically in one embodiment, the first panel 2 and the second panel 3 can be completely identical structure, which can be mass-produced, further reducing the complexity of the forming process.

[0049] In one battery shell embodiment, as shown in Figures 6-8As shown, the first panel 2 is provided with a plurality of first protrusions 21 on the side opposite to the second panel 3, the spacing between each first protrusion 21 and the bottom plate 12 is equal, and each first protrusion 21 is located at the end of the first panel 2 away from the bottom plate 12. And / or, the second panel 3 is provided with a plurality of second protrusions 31 on the side opposite to the first panel 2, the spacing between each second protrusion 31 and the bottom plate 12 is equal, and each second protrusion 31 is located at the end of the second panel 3 away from the bottom plate 12.

[0050] In the embodiment, the plurality of first protrusions 21 and the plurality of second protrusions 31 can be used to support the top cover assembly 41, form positioning, and facilitate better welding. Specifically, the first protrusions 21 and the second protrusions 31 can be of the same structure.

[0051] The utility model relates to a kind of power battery, such as Figures 1-9 As shown, including the battery shell in the previous embodiment, the power battery further includes top cover assembly 41 and electric core, top cover assembly 41 is capped in opening portion, to cooperate with the battery shell to form airtight space, electric core is housed in airtight space, top cover assembly 41 also has the pole 43 of electric core and external electrical connection.

[0052] In the embodiment, by applying the battery shell in the previous embodiment, the forming process of the overall power battery is simplified, and while the structural strength meets the performance requirements, the size of the internal airtight space volume is increased and the energy density is improved, and the damage of the bottom round corner to the electric core can also be avoided.

[0053] In a power battery embodiment, the top cover assembly 41 includes a cover plate 41, a lower plastic 42, a pole 43, a sealing ring 44 and an upper plastic 45, the cover plate 41 is capped in the opening portion, the side wall thereof is welded with the battery shell, and the cover plate 41 further has a first through hole penetrating the cover plate 41. The lower plastic 42 is connected to the side of the cover plate 41 facing the bottom plate 12, and the lower plastic 42 has a second through hole. The pole 43 is provided in the first through hole and the second through hole, and is fixed to the cover plate 41 after riveting. The upper plastic 45 is installed on the side of the cover plate 41 away from the bottom plate 12, and has a pressing portion partially extending into the first through hole. The sealing ring 44 is sleeved on the pole 43, and the sealing ring 44 abuts against the pressing portion to be able to be pressed during riveting.

[0054] In the embodiment, by providing the upper plastic 45, the lower plastic 42 and the sealing ring 44, the discharge arc between the pole 43 and the cover plate 41 can be avoided, and the abutment of the pressing portion and the sealing ring 44 can compress the sealing ring 44 when the pole 43 is subsequently riveted / pressed, so that the sealing ring 44 is more fully filled in the space inside the pole 43 and the first through hole.

[0055] Specifically, the four peripheral sidewalls of the cover plate 41 need to be welded with the first side plate 11, the second side plate 13, the first face plate 2 and the second face plate 3 respectively, so as to realize the circumferential sealing of the power battery by welding.

[0056] In an embodiment of the power battery, as shown in Figure 9 The cover plate 41 is provided with an annular protrusion 411 arranged around the first through hole.

[0057] In the embodiment, the annular protrusion 411 can prevent the cover plate 41 from deforming in the subsequent riveting / press riveting process.

[0058] In an embodiment of the power battery, as shown in Figure 9 The annular protrusion 411 is flush with the inner wall surface of the first through hole relative to the sidewall surface of the pole 43.

[0059] In the embodiment, the annular protrusion 411 can be formed synchronously in the first through hole processing process, and the forming process is simple. In the riveting / press riveting process of the pole 43, the closer to the sidewall surface of the pole 43, the more stress points there are. The embodiment makes the annular protrusion 411 closer to the pole 43, and thickens the thickness of the place, further preventing the cover plate 41 from deforming in the riveting / press riveting process.

[0060] Specifically, the annular protrusion 411 and the first through hole can be circular in shape, concentric with each other, and the diameter of the first through hole is equal to the inner wall diameter of the annular protrusion 411.

[0061] In an embodiment of the power battery, in combination with Figure 2 , Figure 3 and Figure 9 As shown, the cover plate 41 is provided with a positioning column 412 on the side away from the bottom plate 12, and the upper plastic 45 is provided with a positioning portion 451 matched with the positioning column 412, and the positioning portion 451 is sleeved on the positioning column 412.

[0062] In the embodiment, the positioning column 412 can position the upper plastic 45, facilitating installation. The number of the positioning column 412 can be multiple, for example, two, arranged on both sides of the first through hole.

[0063] The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present disclosure.

[0064] The above embodiments only express several implementation manners of the utility model, the description is more specific and detailed, but can not therefore be understood as the limitation of the application patent range. It should be pointed out that for ordinary skilled person in the art, without departing from the utility model concept, several deformations and improvements can be made, which belong to the protection range of the utility model. Therefore, the protection range of the utility model patent should be subject to the appended claims.

Claims

1. A battery casing, characterized in that, The battery casing includes an alloy side shell, a first panel, and a second panel. The first panel is connected to one side of the side shell, and the second panel is connected to the side of the side shell away from the first panel. The side shell includes a first side plate, a bottom plate, and a second side plate connected in sequence to form a U-shape, so as to form an opening with the first panel and the second panel. The base plate has a groove along its circumference on the side facing the opening. The groove is located on the outer edge of the base plate, and the first side plate and the second side plate are spaced apart from the side wall of the groove. The first panel and the second panel are both connected to the bottom of the groove and are spaced apart from the side wall of the groove.

2. The battery casing as described in claim 1, characterized in that, The thickness of the base plate is not less than the thickness of the first side plate or the second side plate.

3. The battery casing as described in claim 1, characterized in that, The distance between the end of the first panel away from the base plate and the base plate is a first distance, and the distance between the end of the second panel away from the base plate and the base plate is a second distance, wherein the first distance and the second distance are equal.

4. The battery casing as described in claim 1 or 3, characterized in that, The first panel has a plurality of first protrusions on one side opposite to the second panel. The distance between each first protrusion and the bottom plate is equal, and all of them are located at the end of the first panel away from the bottom plate. And / or, the second panel has a plurality of second protrusions on one side opposite to the first panel, each second protrusion being equally spaced from the base plate and located at the end of the second panel away from the base plate.

5. A power battery, characterized in that, The power battery includes a battery casing as described in any one of claims 1-4, and further includes a top cover assembly and a battery cell. The top cover assembly covers the opening to form a sealed space with the battery casing. The battery cell is housed in the sealed space. The top cover assembly also has terminals for electrically connecting the battery cell to the outside.

6. The power battery as described in claim 5, characterized in that, The top cover assembly includes: A cover plate is provided to seal the opening, and its sidewalls are welded to the battery casing. The cover plate is also provided with a first through hole penetrating the cover plate. The lower plastic is connected to the side of the cover plate facing the bottom plate, and a second through hole is provided on the lower plastic; The pole is inserted through the first through hole and the second through hole, and is fixed to the cover plate after being riveted. The plastic is installed on the side of the cover plate away from the bottom plate and has a pressure-applying part that extends into the first through hole; A sealing ring is fitted onto the pole post and abuts against the pressure-applying part so that it can be subjected to pressure during riveting.

7. The power battery as described in claim 6, characterized in that, The cover plate is provided with an annular protrusion surrounding the first through hole.

8. The power battery as described in claim 7, characterized in that, The annular protrusion is flush with the inner wall of the first through hole relative to the side wall of the pole post.

9. The power battery as described in claim 6, characterized in that, The cover plate has a positioning post on the side opposite to the base plate, and the upper plastic has a positioning part that matches the positioning post, and the positioning part is sleeved on the positioning post.

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