Battery box and battery

Abstract

The utility model provides a battery box and a battery, and belongs to the technical field of energy storage equipment, the battery box comprises a bottom surface, the bottom surface is provided with a rectangular first valley folding frame-shaped mark, the four corners of the first valley folding frame-shaped mark are respectively provided with a second valley folding line section, the bottom surface is subjected to valley folding along the first valley folding frame-shaped mark and the second valley folding line sections to form four folding edges, and the bottom surface is provided with a first valley folding line section and a second valley folding line section. A first accommodating box with an opening in one end is formed between the folded edge and the bottom surface; each folding edge is provided with a first peak folding line section, the folding edges are folded along the first peak folding line sections to form connecting edges, and an overlapping area exists between every two adjacent connecting edges; the connecting piece is connected with the connecting edge in a sealing manner, so that the first accommodating box is sealed; the storage box has the advantages that the first accommodating box is formed by folding the bottom surface, so that the positions and the sizes of a plurality of line segments such as the first valley folding frame-shaped mark and the first peak folding line segment can be correspondingly adjusted according to actual requirements, and the box structure required by pole piece groups with different lengths, widths and thicknesses can be met; and the battery cell with a relatively thick size cannot be produced without being limited by the influence of the depth of the punching pit.

Description

TECHNICAL FIELD

[0001] The utility model belongs to energy storage equipment technical field, especially relate to a battery box and battery. BACKGROUND

[0002] The current power battery enterprise, especially soft package power battery enterprise generally will adopt aluminum plastic film to pack the pole piece group pole piece. On the basis of prior art, the thickness of pole piece group is limited by the ductility / pit depth of aluminum plastic film and cannot be too thick, the current industry aluminum plastic film pit depth is about 8mm, the aluminum plastic film of two pits is buckled and finally can get about 16mm thickness pole piece group. In the case that the length and width of pole piece group are certain, the thickness direction limits the capacity of pole piece group cannot be large, and then affects the system grouping efficiency of module / battery.

[0003] To solve the technical problem of the above-mentioned pole piece group thickness limitation, patent number CN220914384U discloses a kind of soft package battery, which specifically discloses: without improving the ductility of coating film itself, pit is formed to the multiple positions of coating film from outside to inside, the pit depth is no longer limited by the ductility of coating film itself, so that more pole groups can be accommodated between upper and lower coating films, increasing the thickness of soft package pole piece group, greatly improving the capacity of soft package pole piece group. But in the above-mentioned disclosed patent, it still essentially uses the technical means of pit forming to coating film, still limited by the shortcomings of aluminum plastic film ductility. Moreover, multi-stage pit forming leads to multiple pit areas, one solution is to stack the same size pole piece according to the smallest pit position, which will cause serious waste of space around other multi-stage pits, affecting the volume utilization rate of pole piece group. Or according to different size pole piece and separator layering stacking, which will cause the pole piece in the deepest pit area to be bent multiple times through other accommodation grooves to lead to the ear, and these inner ears will inevitably affect the placement of other accommodation groove pole pieces. The actual feasibility of the above-mentioned technical solution is not high. UTILITY MODEL CONTENTS

[0004] The utility model aims at the above-mentioned problems existing in prior art, and proposes a structure of battery box formed by folding instead of existing composite film pit production battery box.

[0005] The utility model can be realized by the following technical scheme: a kind of battery box, comprising:

[0006] Bottom surface, the first valley fold frame mark of rectangular setting is arranged on the bottom surface, second valley fold line segment is arranged at the four corners of the first valley fold frame mark, the bottom surface is valley folded along the first valley fold frame mark and the second valley fold line segment and forms four fold edges, and the fold edge and the bottom surface form a first accommodating box with an opening at one end;

[0007] Each of the folded edges is provided with a first peak fold line segment, and the folded edge is formed by folding along the first peak fold line segment to form a connecting edge, and there is an overlapping area between two adjacent connecting edges;

[0008] A connector is provided, which is sealed to the connecting edge to achieve closure of the first receiving box.

[0009] In one of the battery boxes described above, bending notches are provided at the four corners of the bottom surface.

[0010] In the aforementioned battery box, two overlapping valley fold lines are symmetrically arranged on two opposite connecting edges. The end of each overlapping valley fold line intersects with the end of the corresponding first peak fold line segment. The two connecting edges form an overlapping area with the other two connecting edges after folding along the overlapping valley fold line segments.

[0011] In one of the battery boxes described above, the connector includes a sealing sheet, and all connecting edges are sealed to the sealing sheet.

[0012] In the aforementioned battery box, the two connecting edges and the sealing sheet are each provided with a third peak fold line segment, and the connecting edges and the sealing sheet are folded along the third peak fold line segment to form a sealing edge.

[0013] In one of the battery boxes described above, the connector includes a second receiving box, which also has a connecting edge, and the connecting edge on the first receiving box is connected to the connecting edge on the second receiving box.

[0014] In the aforementioned battery box, a fourth peak fold line segment is provided on two opposite connecting edges of the first receiving box, and a third valley fold line segment is provided on two opposite connecting plates of the connecting edge of the second receiving box. The connecting edge of the first receiving box forms a peak fold along the fourth peak fold line segment, and the connecting edge of the second receiving box forms a valley fold along the third valley fold line segment to form a sealing edge.

[0015] A battery comprising the aforementioned battery case.

[0016] The battery described above also includes a tab that extends from between the connector and the connecting edge.

[0017] In the aforementioned battery, the electrode portion includes a first electrode and a second electrode, wherein the first electrode and the second electrode extend from the connector and the connecting edge at the same end, or the first electrode and the second electrode extend from the connector and the connecting edge at opposite ends.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] 1. The area of ​​the first valley fold frame in the rectangular setting is the area of ​​the first receiving box in the horizontal space, and the straight distance between the first peak fold line segment and the bottom surface is the depth of the first receiving box. Since the first receiving box in this application is formed by folding the bottom surface, the position and size of the first valley fold frame, the first peak fold line segment and other line segments can be adjusted according to actual needs to meet the box structure required by electrode groups of different lengths, widths and thicknesses, and is no longer limited by the influence of the pit depth to produce thicker cells.

[0020] 2. A bend will be formed at the bottom joint where the second valley fold line segment bends. This bend extends beyond the first receiving box, increasing the space required for the use of the first receiving box. Therefore, bend notches are provided at the four corners of the bottom surface, which can reduce the length of the bend formed after the valley fold is made along the second valley fold line segment on the bottom surface. Attached Figure Description

[0021] Figure 1 This is a structural schematic diagram of the bottom embodiment;

[0022] Figure 2 This is one of the schematic diagrams of the three-dimensional structure of the first container box after it has been formed;

[0023] Figure 3 yes Figure 2 A schematic diagram of the three-dimensional structure after heat sealing and folding;

[0024] Figure 4 This is the second schematic diagram of the three-dimensional structure of the first container box after it has been formed;

[0025] Figure 5 This is a schematic cross-sectional view of the connection between the first receiving box and the sealing plate;

[0026] Figure 6 This is a schematic diagram of the exploded structure of the single-headed electrode tab in Example 1;

[0027] Figure 7 This is a schematic diagram of the exploded structure of the dual-headed electrode tab in Example 1;

[0028] Figure 8 This is a schematic diagram of the exploded structure of the dual-headed electrode tab in Example 2;

[0029] Figure 9 This is a schematic diagram of the exploded structure of the single-headed electrode lug in Example 2.

[0030] In the diagram, the first valley zigzag segment L1; the long-side valley zigzag segment L01; the short-side valley zigzag segment L02; the second valley zigzag segment L2; the first peak zigzag segment l1; the second peak zigzag segment l2; the first overlapping segment L11; the second overlapping segment L12; the third overlapping segment L21; the fourth overlapping segment L22; the bottom surface 100; the folded edge 101; the first receiving box 102; the connecting edge 103; the sealing sheet 104; the second receiving box 105; the sealing edge 106; the bending notch 107; the bending edge 108; the long-side connecting edge 109; the short-side connecting edge 110; the electrode assembly 200; the first electrode tab 201; and the second electrode tab 202. Detailed Implementation

[0031] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0032] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0033] Example 1, as Figures 1-7 As shown, a battery box includes:

[0034] The bottom surface 100 has a first valley fold frame L1 in a rectangular shape. The four corners of the first valley fold frame L1 are provided with second valley fold line segments L2. The bottom surface 100 is valley folded along the first valley fold frame L1 and the second valley fold line segments L2 to form four folded edges 101. The folded edges 101 and the bottom surface 100 form a first receiving box 102 with an opening at one end.

[0035] Each folded edge 101 is provided with a first peak fold line segment l1. The folded edge 101 is folded along the first peak fold line segment l1 to form a connecting edge 103, and there is an overlapping area between two adjacent connecting edges 103.

[0036] The connector is sealed to the connecting edge 103 to achieve closure of the first receiving box 102.

[0037] In this embodiment, the area of ​​the first valley fold frame L1, which is rectangular, is the area of ​​the first receiving box 102 in horizontal space. The straight-line distance between the first peak fold line segment l1 and the bottom surface 100 is the depth of the first receiving box 102. Since the first receiving box 102 in this application is formed by folding the bottom surface 100, the position and size of the first valley fold frame L1, the first peak fold line segment l1, and other line segments can be adjusted according to actual needs to meet the box structure required by electrode groups 200 with different lengths, widths, and thicknesses. It is no longer limited by the influence of the pit depth and cannot produce thicker cells.

[0038] It should be noted that the peak and valley breaks in this application are both based on... Figure 1 The perspective shown is used to determine this.

[0039] It is worth mentioning that the bottom surface 100 is a rectangular plate; and the material of the bottom surface 100 is a composite film, such as aluminum-plastic film.

[0040] In a further preferred embodiment, each of the four corners of the bottom surface 100 is provided with a bending notch 107.

[0041] In this embodiment, if the bottom surface 100 is valley-folded according to the above-mentioned setting of the first valley fold frame shape L1 and the second valley fold line segment L2, a bent edge 108 will be formed at the junction of the bottom surface 100 bent along the second valley fold line segment L2. The bent edge 108 extends out of the first receiving box 102, increasing the space occupied by the first receiving box 102. Therefore, a bending notch 107 is provided at the four corners of the bottom surface 100, which can reduce the length of the bent edge 108 formed after the bottom surface 100 is valley-folded along the second valley fold line segment L2. However, in order to ensure the stable heat-sealing connection of the folded edge 101, the bent edge 108 cannot be completely eliminated. Therefore, the length dimension of the second valley fold line segment L2 must be greater than 0.

[0042] It is worth mentioning that the bending notch 107 is rectangular in shape, and one of its corners intersects with the endpoint of the second valley broken line segment L2.

[0043] Specifically, two overlapping valley broken line segments are symmetrically arranged on the two opposite connecting edges 103. The end of each overlapping valley broken line segment intersects with the end of the corresponding first peak broken line segment l1. The two connecting edges 103 form an overlapping area with the other two connecting edges 103 after valley breaking along the overlapping valley broken line segments.

[0044] In this embodiment, when the bottom surface 100 is bent along the first valley fold frame line L1 and the second valley fold line segment L2, four folded edges 101 are formed. A first receiving box 102 with an opening at one end is formed between the folded edges 101 and the bottom surface 100. At this time, the folded edges 101 and the bottom surface 100 are perpendicular to each other, that is, the folded edges 101 are in a vertical state. Therefore, two overlapping valley fold line segments are symmetrically arranged on the two opposite connecting edges 103. The end of each overlapping valley fold line segment intersects with the end of the corresponding first peak fold line segment l1. After the connecting edge 103 is folded along the overlapping valley fold line segment, an overlapping area is formed between it and the other two connecting edges 103. That is, the folded edge 101 needs to be folded again so that its end is bent in a horizontal state to form the connecting edge 103.

[0045] like Figure 1 As shown, as one alternative, the bottom surface 100 is provided with a first valley fold frame L1 and a second valley fold line segment L2. The bottom surface 100 is valley folded along the first valley fold frame L1 and the second valley fold line segment L2, so that the first overlapping line segment L11 and the second overlapping line segment L12 on the bottom surface 100 are attached, and the third overlapping line segment L21 and the fourth overlapping line segment L22 are attached, forming a vertical folded edge 101 on the bottom surface 100. Then, along the first peak fold line segment l1 on each folded edge 101, the folded edge 101 is peak folded to form a connecting edge 103. At the same time, using the fourth overlapping line segment L22 on the bottom surface 100 as the overlapping valley fold line segment and the second peak fold line segment l2 on the bottom surface 100 as the bending line, the folded edge 101 where the second overlapping line segment L12 is located is valley folded along the overlapping valley fold line segment and peak folded along the second peak fold line segment l2, as shown. Figure 2 As shown, an overlapping area is formed between the folded edge 101 and the other two connecting edges 103, and a horizontal connecting edge 103 is formed on each folded edge 101.

[0046] It is worth mentioning that the first overlapping line segment L11 is collinear with one of the first valley fold lines L1, the second overlapping line segment L12 is collinear with another first valley fold line L1, and the third overlapping line segment L21 and the fourth overlapping line segment L22 are collinear with the corresponding first peak fold line segments l1 on the folded edge 101.

[0047] Preferably, the connector includes a sealing plate 104, and all connecting edges 103 are sealed to the sealing plate 104.

[0048] In a further preferred embodiment, the two oppositely arranged connecting edges 103 and sealing sheet 104 are each provided with a third peak fold line segment, and the connecting edges 103 and sealing sheet 104 are folded along the third peak fold line segment to form a sealing edge 106.

[0049] It is worth mentioning that the sealing edge 106 can be heat-sealed to achieve a sealing connection effect.

[0050] In this embodiment, the connector includes a sealing sheet 104, which covers the first receiving box 102. All connecting edges 103 abut against the sealing sheet 104, and then the connecting edges 103 and the sealing sheet 104 are folded along the third fold line segment to form a sealing edge 106.

[0051] like Figure 5 As shown, the first peak broken line segment l1 is selected as the third peak broken line segment. That is, the broken edge 101 forms a horizontal connecting edge 103 after folding along the first peak broken line segment l1. When the sealing sheet 104 abuts, the two connecting edges 103 and the sealing sheet 104 are folded again along the first peak broken line segment l1 to form a sealing edge 106.

[0052] In this application, heat sealing of the bent sealing edge 106 can better align and smoothly connect the edges of the aluminum-plastic film, which helps to improve the sealing quality of the heat-sealed area.

[0053] Example 2, as Figure 8 , Figure 9 As shown, the structure is the same as that in Embodiment 1, except that the connector includes a second receiving box 105, and a connecting edge 103 is also provided on the second receiving box 105. The connecting edge 103 on the first receiving box 102 is connected to the connecting edge 103 on the second receiving box 105.

[0054] It is worth mentioning that the second container 105 has the same structure as the first container 102.

[0055] More preferably, the connecting edge 103 of the first receiving box 102 is provided with a fourth peak fold line segment, and the connecting edge 103 of the second receiving box 105 is provided with a third valley fold line segment. The connecting edge 103 of the first receiving box 102 is folded along the fourth peak fold line segment, and the connecting edge 103 of the second receiving box 105 is folded along the third valley fold line segment to form a sealing edge 106.

[0056] It should be noted that the third peak broken line segment, the third valley broken line segment, and the fourth peak broken line segment are in the same position as the first peak broken line l1 on the corresponding receiving box, that is, they are collinear. The only difference is in the direction in which the connecting edge 103 is bent when the first receiving box 102 and the first receiving box 105 are folded.

[0057] In this embodiment, the connector includes a second receiving box 105. The second receiving box 105 is folded in the same way as the first receiving box 102. The only difference is that when the first receiving box 102 and the second receiving box 105 are connected, the connecting edge 103 on the first receiving box 102 is bent along the fourth peak fold line segment, while the connecting edge 103 on the second receiving box 105 is bent along the third valley fold line segment to form a sealing edge 106.

[0058] It should be noted that in all the above embodiments, when the connecting edge 103 is folded to form a sealing edge, the overlapping area formed on the connecting edge 103 also needs to be folded.

[0059] A battery includes a battery case as described above, an electrode assembly 200 disposed inside the battery case, and an electrode tab provided on the electrode assembly 200, the electrode tab extending through the connection member and the connection edge 103; the electrode tab includes a first electrode tab 201 and a second electrode tab 202, the first electrode tab 201 and the second electrode tab 202 extending through the connection member and the connection edge 103 at the same end, or the first electrode tab 201 and the second electrode tab 202 respectively extending through the connection member and the connection edge 103 at opposite ends.

[0060] In this embodiment, an electrode assembly 200 is provided inside the battery box. A first tab 201 and a second tab 202 extend from the electrode assembly 200 as tab portions. Figure 6 , Figure 9 As shown, as an optional solution, the first electrode tab 201 and the second electrode tab 202 are located at the same end of the electrode assembly 200, so the first electrode tab 201 and the second electrode tab 202 extend from between the connector and the connecting edge 103 at the same end; as Figure 7 , Figure 8 As shown, as another alternative, the first electrode 201 and the second electrode 202 are located at opposite ends of the electrode assembly 200, and the first electrode 201 and the second electrode 202 extend from between the corresponding connector and the connecting edge 103.

[0061] It is worth mentioning that when the first receiving box 102 is connected to the sealing sheet 104, or when the first receiving box 102 is connected to the second receiving box 105, only the two oppositely arranged connecting edges 103 on the first receiving box 102 will be folded 101 for sealing. Therefore, the first tab 201 and the second tab 202 need to extend from the other two connecting edges 103 without folded edges 101. During heat sealing, an air bag area should be reserved at the connecting edge 103 where the tab 201 is located to accommodate the gas that may be generated during battery use. This can reduce the risk of excessive internal pressure causing the battery casing to rupture or explode, thereby extending the battery's service life.

[0062] It is worth mentioning that after the bottom surface 100 is folded along the second valley fold line segment L2, a bent edge 108 will be formed. The extension direction of the bent edge 108 is set to be parallel to the length direction of the connecting edge 103 that is sealed by the bent edge 101.

[0063] like Figures 1-3 As shown, for ease of understanding, the first valley fold frame shape L1 is defined by two parallel long valley fold line segments L01 and L02. The bottom surface 100 forms a long side fold and a short side fold along the long side valley fold line segment L01 and the short side valley fold line segment L02. The long side fold and the short side fold are folded along the first peak fold line segment l1 to form a long side connecting edge 109 and a short side connecting edge 110. The overlapping area formed between the long side connecting edge 109 and the short side connecting edge 110 is... The area is covered on the long side connecting edge 109, and then the long side connecting edge 109 continues to bend along the first peak fold line segment l1 located thereon to form the sealing edge 106. That is, the long side fold edge is bent at 90° along the first peak fold line segment l1 to form the long side connecting edge 109, and the long side connecting edge 109 continues to bend at 90° along the first peak fold line segment l1 to form the sealing edge 106. The bent edge 108 is located in the length extension direction of the long side connecting edge 109, and the air bag area is located on the short side connecting edge 110.

[0064] It should be noted that in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly defined. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly defined. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0065] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0066] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A battery box, characterized in that, include: The bottom surface has a first valley fold frame shaped in a rectangular shape. A second valley fold line segment is provided at each of the four corners of the first valley fold frame shaped in a rectangular shape. The bottom surface is valley folded along the first valley fold frame shaped in a rectangular shape and the second valley fold line segment to form four folded edges. A first receiving box with an opening at one end is formed between the folded edges and the bottom surface. Each of the folded edges is provided with a first peak fold line segment, and the folded edge is formed by folding along the first peak fold line segment to form a connecting edge, and there is an overlapping area between two adjacent connecting edges; A connector is provided, which is sealed to the connecting edge to achieve closure of the first receiving box.

2. A battery box according to claim 1, characterized in that, The bottom surface has bending notches at all four corners.

3. A battery box according to claim 1 or 2, characterized in that, Two overlapping valley broken line segments are symmetrically arranged on the two opposite connecting edges. The end of each overlapping valley broken line segment intersects with the end of the corresponding first peak broken line segment. The two connecting edges form an overlapping area with the other two connecting edges after folding along the overlapping valley broken line segments.

4. A battery box according to claim 1, characterized in that, The connector includes a sealing plate, and all connecting edges are sealed to the sealing plate.

5. A battery box according to claim 4, characterized in that, The two connecting edges and the sealing sheet are respectively provided with a third peak fold line segment. The connecting edges and the sealing sheet are folded along the third peak fold line segment to form a sealing edge.

6. A battery box according to claim 1, characterized in that, The connector includes a second receiving box, which also has a connecting edge, and the connecting edge on the first receiving box is connected to the connecting edge on the second receiving box.

7. A battery box according to claim 6, characterized in that, The first container has a fourth peak fold line segment on two opposite connecting edges, and the second container has a third valley fold line segment on two opposite connecting plates. The connecting edges on the first container are folded along the fourth peak fold line segment, and the connecting edges on the second container are folded along the third valley fold line segment to form a sealing edge.

8. A battery, characterized in that, Includes the battery box as described in any one of claims 1-7 above.

9. A battery according to claim 8, characterized in that, It also includes a tab that extends from between the connector and the connecting edge.

10. A battery according to claim 9, characterized in that, The electrode portion includes a first electrode and a second electrode. The first electrode and the second electrode extend from the connector and the connecting edge at the same end, or the first electrode and the second electrode extend from the connector and the connecting edge at opposite ends.

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