Battery shell and battery
By setting a limiting part on the inner side of the side plate of the battery casing, the problem of lithium or sodium deposition caused by poor adhesion around the edges of the electrode is solved, and the electrode is used during battery use, which improves the reversible capacity and cycle life of the battery.
Patent Information
- Application Number
- CN202422778588.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-14
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2034-11-14
AI Technical Summary
In the use of square batteries, the adhesion of the electrode edges is poor, which can easily create gaps, leading to lithium or sodium plating and affecting battery life.
A limiting part is provided on the inner side of the side plate of the battery casing. The limiting part protrudes from the receiving cavity and is used to constrain the edge of the electrode. The limiting part of the limiting component corresponds to the specific application of the limiting part of the limiting component to the edge of the electrode. The limiting part constrains the edge of the electrode, reduces the gap, and reduces the possibility of lithium or sodium plating.
It effectively reduces the possibility of lithium or sodium plating at the electrode edges, improves the reversible capacity of the battery, thereby increasing the energy density and extending the battery's cycle life and cycle life.
Smart Images
Figure CN223625068U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, specifically to a battery casing and a battery. Background Technology
[0002] Lithium-ion batteries are a very important type of rechargeable battery, widely used in various electronic devices, electric vehicles, and energy storage systems due to their high energy density, long lifespan, and lightweight characteristics. Batteries are generally classified by shape into cylindrical batteries, pouch batteries, and prismatic batteries.
[0003] A square battery includes a battery casing and a battery cell disposed inside the battery casing. The battery casing includes a shell and a cover plate, which together form a cavity for accommodating the battery cell. The battery cell includes a positive electrode, a negative electrode, and a separator. The battery cell is manufactured through a lamination process or a winding process, and in this case, the battery cell can be called a lamination battery cell or a winding battery cell.
[0004] During battery use, lithium or sodium plating in the later stages of battery cycling is one of the important reasons for battery degradation. Because there is no external tension to restrain the stacked cells, the adhesion of the electrode edges is poor, resulting in gap problems. Lithium or sodium plating is more likely to occur at the edges of the negative electrode. In the later stages of cycling, interface problems are easily aggravated, which accelerates battery degradation. Utility Model Content
[0005] In view of this, the present invention provides a battery casing and a battery to solve the problem that poor adhesion at the edges of the electrode sheets easily leads to gaps, making lithium or sodium plating more likely to occur at the edges of the electrode sheets.
[0006] In a first aspect, the present invention provides a battery housing, comprising: two first side plates disposed opposite to each other; two second side plates disposed opposite to each other and forming a receiving cavity with the two first side plates; wherein each first side plate includes a plate body portion and a limiting portion disposed on the inner side surface of the plate body portion, the limiting portion corresponding to at least a portion of the periphery of the electrode sheet and used to constrain the edge of the electrode sheet.
[0007] Beneficial effects: A limiting part is provided on the inner side of the plate body, and the limiting part protrudes towards the receiving cavity relative to the inner side of the plate body. That is, at least a thickened area is provided on the periphery of the first side plate corresponding to the electrode sheet. In this way, the edge of the electrode sheet is constrained by the limiting part, thereby reducing the gap at the edge of the negative electrode sheet. To a certain extent, the possibility of lithium or sodium plating at the edge of the electrode sheet is reduced, thereby slowing down battery degradation and extending the cycle life of the battery.
[0008] In one alternative implementation, the limiting portion is a limiting frame at the periphery of the corresponding electrode.
[0009] Beneficial effects: The size of the limiting frame is matched with the size of the electrode. The limiting frame can constrain all four edges of the electrode. The limiting frame has a strong binding force on the four edges of the electrode, which can almost avoid gaps at the edges of the negative electrode. This further reduces the possibility of lithium or sodium plating at the edges of the electrode, which can improve the reversible capacity of the battery and thus improve the energy density.
[0010] In one alternative embodiment, the limiting portion includes a plurality of limiting protrusions spaced apart along the periphery of the electrode.
[0011] Beneficial effects: By forming a limiting part through multiple limiting protrusions, the edges of the electrode can be constrained, which effectively reduces the possibility of lithium or sodium plating at the edges of the electrode. In addition, less material is used when manufacturing the battery casing, saving material costs.
[0012] In one alternative embodiment, multiple limiting protrusions form four corner protrusions at the four corners of the corresponding electrode and side protrusions between the two corners of the corresponding electrode; or, multiple limiting protrusions form four corner protrusions at the four corners of the corresponding electrode.
[0013] Beneficial effects: The corner protrusions restrain the corners of the electrode, while the side protrusions restrain the portion between the two corners of the electrode. The corner protrusions and side protrusions have a good restraining effect on the electrode.
[0014] In one optional embodiment, the limiting portion includes two opposing limiting protrusions that extend along the height direction of the first side plate or along the length direction of the first side plate.
[0015] Beneficial effects: By constraining the two opposite edges of the electrode by two limiting protrusions, the gap at the edge of the negative electrode can be reduced, which to a certain extent reduces the possibility of lithium or sodium plating at the edge of the electrode, thereby slowing down battery degradation and extending the cycle life of the battery.
[0016] In one alternative embodiment, in the direction of the thickness of the first side plate, the thickness T of the plate body portion ranges from 0.4 mm to 0.8 mm, and the thickness T1 of the limiting portion ranges from 0.1 mm to 0.5 mm.
[0017] Beneficial effects: It not only controls the weight, volume, cost, and space occupied by the limiting part of the battery, but also ensures the battery's heat insulation effect, sealing performance, corrosion resistance, and edge restraint effect, effectively reducing the possibility of lithium or sodium plating at the edge of the electrode.
[0018] In one alternative embodiment, the limiting portion has a first surface facing the center of the plate portion and a second surface facing away from the center of the plate portion, and the vertical distance 'a' between the first surface and the second surface is 1mm-5mm.
[0019] Beneficial effects: It can both ensure the edge restraint of the electrode and control the amount of material used and the cost.
[0020] In one alternative embodiment, the battery casing further includes a base plate, wherein in the height direction of the first side plate, the distance x between the bottom of the limiting portion and the base plate is 0.7mm-4.5mm, and the distance y between the top of the limiting portion and the top surface of the first side plate is 3mm-15mm.
[0021] Beneficial effects: It not only ensures the restraint effect on the edge of the electrode, but also does not affect the assembly of the cover plate and facilitates manufacturing.
[0022] In one alternative embodiment, in the length direction of the first side plate, the distance m between each second side plate and the side of the limiting portion adjacent to it is 0.7mm-2.5mm.
[0023] Beneficial effects: It not only ensures the constraint effect on the edge of the electrode, but also facilitates the manufacturing of the battery casing.
[0024] Secondly, this utility model also provides a battery, including: the battery casing described above. Attached Figure Description
[0025] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0026] Figure 1 This is a perspective view of the first type of battery casing according to an embodiment of the present utility model;
[0027] Figure 2 for Figure 1 A top view of the battery casing shown;
[0028] Figure 3 for Figure 2 The image shows a cross-sectional view of the battery casing along line AA.
[0029] Figure 4 for Figure 2 The BB-direction cross-sectional view of the battery casing and battery cell is shown.
[0030] Figure 5 This is a cross-sectional view of a second type of battery casing according to an embodiment of the present utility model;
[0031] Figure 6This is a cross-sectional view of a third type of battery casing according to an embodiment of the present utility model;
[0032] Figure 7 This is a cross-sectional view of the fourth type of battery casing according to an embodiment of the present utility model;
[0033] Figure 8 This is a cross-sectional view of the fifth type of battery casing according to an embodiment of the present utility model.
[0034] Explanation of reference numerals in the attached figures:
[0035] 1. First side panel; 101. Panel body; 102. Limiting frame; 103. Limiting protrusion; 1031. Corner protrusion; 1032. Side protrusion; 104. Limiting strip;
[0036] 2. Second side panel;
[0037] 3. Base plate;
[0038] 4. Battery cells. Detailed Implementation
[0039] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0040] The following is combined with Figures 1 to 8 The following describes embodiments of the present invention.
[0041] According to an embodiment of the present invention, a battery housing is provided, comprising: two first side plates 1 and two second side plates 2. The two first side plates 1 are disposed opposite to each other; the two second side plates 2 are disposed opposite to each other and together with the two first side plates 1 form a receiving cavity; wherein each first side plate 1 includes a plate body portion 101 and a limiting portion disposed on the inner side surface of the plate body portion 101, the limiting portion corresponding to at least a portion of the periphery of the electrode and used to constrain the edge of the electrode.
[0042] In the battery casing of this embodiment, a limiting part is provided on the inner side of the plate portion 101. The limiting part protrudes toward the receiving cavity relative to the inner side of the plate portion 101. That is, at least a thickened area is provided on the periphery of the first side plate 1 corresponding to the electrode. In this way, the edge of the electrode is constrained by the limiting part, thereby reducing the gap at the edge of the negative electrode. This reduces the possibility of lithium or sodium plating at the edge of the electrode to a certain extent, thereby slowing down battery degradation and extending the cycle life of the battery.
[0043] In one embodiment, such as Figure 3 As shown, the limiting part is a limiting frame 102 corresponding to the four edges of the electrode. The size of the limiting frame 102 matches the size of the electrode. The limiting frame 102 can constrain the four edges of the electrode. The limiting frame 102 exerts a large binding force on the four edges of the electrode, which can almost avoid gaps at the edges of the negative electrode, further reducing the possibility of lithium or sodium deposition at the edges of the electrode, thereby improving the reversible capacity of the battery and thus increasing the energy density.
[0044] It is understood that in another embodiment, such as Figure 5 and Figure 6 As shown, the limiting part includes a plurality of limiting protrusions 103 arranged at intervals along the periphery of the electrode. The limiting part is formed by the plurality of limiting protrusions 103, which can constrain the periphery of the electrode, effectively reducing the possibility of lithium or sodium plating at the edge of the electrode. In addition, less material is used when manufacturing the battery casing, saving material costs.
[0045] Furthermore, such as Figure 5 As shown, multiple limiting protrusions 103 form four corner protrusions 1031 at the four corners of the corresponding electrode and side protrusions 1032 between the two corners of the corresponding electrode. The corner protrusions 1031 constrain the corners of the electrode, and the side protrusions 1032 constrain the portion between the two corners of the electrode. The corner protrusions 1031 and the side protrusions 1032 provide a good constraining effect on the electrode. Preferably, there are four side protrusions 1032. Of course, as... Figure 6 As shown, multiple limiting protrusions 103 can also be formed only as four corner protrusions 1031 at the four corners of the corresponding electrode.
[0046] It is understood that in another embodiment, such as Figure 7 and Figure 8 As shown, the limiting portion includes two opposing limiting protrusions 104, which extend along the height direction of the first side plate 1 or along the length direction of the first side plate 1. By constraining the two opposing edges of the electrode sheet with the two limiting protrusions 104, the gap at the edge of the negative electrode sheet can be reduced, thereby reducing the possibility of lithium or sodium plating at the edge of the electrode sheet to a certain extent, thus slowing down battery degradation and extending the cycle life of the battery.
[0047] In one embodiment, in the direction of the thickness of the first side plate 1, the thickness T of the plate body portion 101 ranges from 0.4mm to 0.8mm, and the thickness T1 of the limiting portion ranges from 0.1mm to 0.5mm. Wherein, the thickness T of the plate body portion 101 is also... Figure 4 The transverse dimension of the plate body 101, and the thickness T1 of the limiting part are also... Figure 4The lateral dimension of the limiting part in the middle.
[0048] Furthermore, the thickness T of the plate portion 101 and the thickness of the limiting portion cannot be too thick or too thin. If the thickness of the plate portion 101 and the limiting portion is too thick, it increases the total weight and volume of the battery, limiting its application in compact devices. It also requires more materials, increasing manufacturing costs. A thicker limiting portion also occupies more space, thus affecting the energy density of individual cells and consequently the battery capacity. If the thickness of the plate portion 101 and the limiting portion is too thin, they are more susceptible to breakage under external impact, increasing the risk of damage to the internal cells 4. The heat insulation effect, sealing performance, and corrosion resistance are also poor. A thinner limiting portion has limited restraint on the edges of the electrode, increasing the possibility of lithium or sodium plating at the electrode edges.
[0049] Therefore, the thickness T of the plate portion 101 is in the range of 0.4mm-0.8mm, and the thickness T1 of the limiting portion is in the range of 0.1mm-0.5mm. This not only controls the weight, volume, cost of the battery and the space occupied by the limiting portion, but also ensures the heat insulation effect, sealing performance, corrosion resistance performance and the restraint effect on the edge of the electrode, effectively reducing the possibility of lithium or sodium plating at the edge of the electrode.
[0050] Preferably, the thickness T of the plate body 101 is 0.6 mm, and the thickness T1 of the limiting part is 0.3 mm.
[0051] In one embodiment, the limiting portion has a first surface facing the center of the plate portion 101 and a second surface facing away from the center of the plate portion 101, and the vertical distance 'a' between the first surface and the second surface is 1mm-5mm. Figure 3 , Figures 5 to 8 In the case where the limiting part has a transverse part along the length direction of the first side plate 1, the vertical distance 'a' between the first surface and the second surface of the limiting part refers to the vertical dimension of the transverse part. When the limiting part has a vertical part along the height direction of the first side plate 1, the vertical distance 'a' between the first surface and the second surface of the limiting part refers to the transverse dimension of the vertical part.
[0052] Furthermore, the vertical distance 'a' between the first and second surfaces of the limiting part should not be too large or too small. If 'a' is large, more material is used, increasing manufacturing costs, and the constraint effect on the edge of the electrode is better. If 'a' is small, the constraint effect on the edge of the electrode is worse.
[0053] Therefore, a range of 1mm-5mm ensures the edge restraint of the electrode while controlling material usage and cost. Preferably, a is 3mm.
[0054] In one embodiment, the battery casing further includes a base plate 3. In the height direction of the first side plate 1, the distance x between the bottom of the limiting portion and the base plate 3 is 0.7mm-4.5mm, and the distance y between the top of the limiting portion and the top surface of the first side plate 1 is 3mm-15mm. The distance x between the bottom of the limiting portion and the base plate 3 is also... Figure 3 The vertical dimension between the bottom of the middle limiting part and the top surface of the base plate 3, and the distance y between the top of the limiting part and the top surface of the first side plate 1, are also... Figure 3 The vertical dimension between the top of the middle limiting part and the top surface of the first side plate 1.
[0055] Furthermore, the distance x between the bottom of the limiting part and the base plate 3 and the distance y between the top of the limiting part and the top surface of the first side plate 1 should not be too large or too small. If x and y are large, the distance between the limiting part and the upper and lower edges of the electrode is large, and the constraint effect on the upper and lower edges of the electrode is poor. If x and y are small, the distance between the limiting part and the base plate 3 and the distance between the top surface of the first side plate 1 are close. At the top of the battery casing, this may affect the assembly of the cover plate, and at the bottom of the battery casing, it increases the manufacturing difficulty of the bottom of the battery casing.
[0056] Therefore, the distance x between the bottom of the limiting part and the base plate 3 is in the range of 0.7mm-4.5mm, and the distance y between the top of the limiting part and the top surface of the first side plate 1 is in the range of 3mm-15mm. This not only ensures the constraint effect on the edge of the electrode sheet, but also does not affect the assembly of the cover plate and facilitates manufacturing.
[0057] Preferably, the distance x between the bottom of the limiting part and the base plate 3 is 2.5mm, and the distance y between the top of the limiting part and the top surface of the first side plate 1 is 6mm.
[0058] In one embodiment, along the length of the first side plate 1, the distance m between each second side plate 2 and the side adjacent to its limiting portion is 0.7mm-2.5mm. The distance m between each second side plate 2 and the side adjacent to its limiting portion is also... Figure 3 The lateral dimension between the middle limiting part and the second side plate 2.
[0059] Furthermore, the distance m between each second side plate 2 and the side of the limiting part closest to it should not be too large or too small. If the distance m between each second side plate 2 and the side of the limiting part closest to it is large, the distance between the limiting part and the left and right edges of the electrode is large, and the constraint effect on the left and right edges of the electrode is poor. If the distance m between each second side plate 2 and the side of the limiting part closest to it is small, the distance between the limiting part and the second side plate 2 is close, which increases the manufacturing difficulty of the battery casing.
[0060] Therefore, the distance m between each second side plate 2 and the side of the limiting part closest to it is in the range of 0.7mm-2.5mm, which not only ensures the restraint effect on the edge of the electrode, but also facilitates the manufacturing of the battery casing.
[0061] Preferably, the distance m between each second side plate 2 and the side of the limiting portion adjacent to it is 1.5 mm.
[0062] It should be noted that the directions indicated are up, down, left, and right. Figure 3 The direction indicated by the middle arrow: up, down, left, right.
[0063] According to an embodiment of the present invention, another aspect provides a battery, comprising: the battery casing described above.
[0064] In one embodiment, the battery further includes a cover plate and a cell 4. The battery casing and the cover plate form a battery housing. The cover plate covers the opening of the battery casing. The cell 4 includes a positive electrode, a negative electrode, and a separator, and is formed by a lamination process. In this case, the cell 4 can be called a laminated cell.
[0065] Furthermore, based on the size of the electrode, the wall thickness of the battery casing is increased at the corresponding position on the edge of the electrode to create a binding force around the electrode. The size of the thickened area of the battery casing is consistent with the size of the edge of the electrode. At this time, the thickened area can be rectangular. Of course, the thickened area can also correspond only to the horizontal or vertical edge of the electrode, or only to the four corners of the electrode, or only to the four corners of the electrode and the part between the corners.
[0066] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.
Claims
1. A battery casing, characterized in that, include: The two first side panels (1) are arranged opposite each other; Two second side plates (2) are arranged opposite each other and together with the two first side plates (1) form a receiving cavity; Each of the first side plates (1) includes a plate body (101) and a limiting portion disposed on the inner side surface of the plate body (101), the limiting portion corresponding to at least a portion of the four-dimensional edge of the electrode and used to constrain the edge of the electrode; The limiting part has a first surface facing the center of the plate part (101) and a second surface away from the center of the plate part (101), and the vertical distance a between the first surface and the second surface is 1mm-5mm; The battery casing also includes a bottom plate (3). In the height direction of the first side plate (1), the distance x between the bottom of the limiting part and the bottom plate (3) is 0.7mm-4.5mm, and the distance y between the top of the limiting part and the top surface of the first side plate (1) is 3mm-15mm. In the length direction of the first side plate (1), the distance m between each second side plate (2) and the side of the limiting part adjacent to it is 0.7mm-2.5mm.
2. The battery casing according to claim 1, characterized in that, The limiting part is a limiting frame (102) corresponding to the four edges of the electrode.
3. The battery casing according to claim 1, characterized in that, The limiting portion includes a plurality of limiting protrusions (103) spaced apart along the periphery of the electrode.
4. The battery casing according to claim 3, characterized in that, The plurality of limiting protrusions (103) form four corner protrusions (1031) corresponding to the four corners of the electrode and side protrusions (1032) corresponding to the two corners of the electrode, or the plurality of limiting protrusions (103) form four corner protrusions (1031) corresponding to the four corners of the electrode.
5. The battery casing according to claim 1, characterized in that, The limiting part includes two limiting protrusions (104) arranged opposite to each other. The limiting protrusions (104) extend along the height direction of the first side plate (1) or along the length direction of the first side plate (1).
6. The battery casing according to any one of claims 1 to 5, characterized in that, In the direction of the thickness of the first side plate (1), the thickness T of the plate body (101) ranges from 0.4mm to 0.8mm, and the thickness T1 of the limiting part ranges from 0.1mm to 0.5mm.
7. A battery, characterized in that, include: The battery casing according to any one of claims 1 to 6.