Battery cell housing, battery cell, and battery pack
By setting a transition plane in the cell casing, the problem of detecting blue film damage at the transition arc surface of the cell casing was solved, which improved the detection rate and mechanical stability, and ensured the reliability and capacity of the cell.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SVOLT ENERGY TECHNOLOGY CO LTD
- Filing Date
- 2025-05-30
- Publication Date
- 2026-07-10
AI Technical Summary
In the existing technology, during the testing process, the existing technology cannot effectively solve the problem of the low detection rate of blue film damage at the transition arc surface of the battery cell and the adjacent casing. This leads to short circuits between the battery cell and the adjacent casing, making it impossible to effectively detect damage to the blue film at the transition arc surface of the battery cell and the adjacent casing, resulting in a high false negative rate.
The connection between two adjacent planar sidewalls of the battery cell casing is set as a transition plane, with the included angle α ranging from 130°≤α≤145°. This increases the contact area between the connection between the two adjacent planar sidewalls and the conductive cloth, improves the contact effect, and prevents sharp corners from piercing the blue film.
It improved the detection rate of blue film damage, enhanced the reliability and yield of battery cells, strengthened the mechanical stability of the battery cell casing, and ensured the capacity and energy density of the battery cells.
Smart Images
Figure CN224481025U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, specifically to a cell housing, a cell, and a battery pack. Background Technology
[0002] To prevent short circuits between adjacent cells during battery pack assembly, a blue film (insulating film) is typically wrapped around the outer surface of the cell casing. This prevents short circuits caused by direct physical contact between adjacent cells. Furthermore, to prevent damage to the blue film at the junction of adjacent sides of the cell casing, the junction is usually designed as a rounded transition surface. However, during insulation withstand voltage testing of the cell, the rounded transition surface cannot effectively contact the conductive fabric. Therefore, damage to the blue film at the rounded transition surface is difficult to detect during testing, leading to a high false negative rate. Utility Model Content
[0003] In view of this, the present invention provides a cell housing, a cell, and a battery pack to solve the problem that damage on the blue film located at the transition arc surface is not easily detected.
[0004] In a first aspect, the present invention provides a battery cell housing, including at least three planar sidewalls, with two adjacent planar sidewalls connected by a transition plane, and the transition plane forming an angle α with the adjacent planar sidewalls, wherein the value of α is in the range of 130°≤α≤145°.
[0005] Beneficial Effects: Compared to existing transition arc surfaces, this invention sets the connection between two adjacent planar sidewalls of the battery cell housing as a transition plane. This increases the contact area between the connection point and the conductive cloth, improving the contact effect and thus increasing the detection rate of blue film damage, preventing a decrease in battery cell reliability due to missed detections. Furthermore, by setting the included angle α between the transition plane and the adjacent planar sidewalls according to the above parameters, this invention allows for a relatively smooth transition at the connection point, preventing sharp angles approaching 90° from piercing the blue film and improving the yield rate of battery cell products.
[0006] In one alternative embodiment, the dimension of the planar sidewall is larger than the dimension of the transition plane along the circumferential direction of the cell housing.
[0007] Beneficial effects: A larger planar sidewall dimension than the transition plane dimension allows for a more stable contact and support structure during cell assembly, enhancing the overall mechanical stability of the cell casing and reducing the risk of internal structural displacement or deformation due to external impacts or vibrations. Furthermore, reducing the size of the transition plane avoids excessive use of internal space within the cell casing, ensuring the cell's capacity and energy density.
[0008] In one optional embodiment, the dimension of the transition plane along the circumference of the cell housing is A, and the value of A ranges from 5 mm to 10 mm.
[0009] Beneficial effects: If the size A of the transition plane is less than 5mm, it means that the area where the transition plane can contact the conductive cloth during testing is relatively small, thus hindering the improvement of the detection rate of blue film damage. Conversely, if the size A of the transition plane is greater than 10mm, although it can increase the contact area between the transition plane and the conductive cloth during testing and improve the detection rate of blue film damage, an excessively large transition plane will affect the space utilization rate inside the cell casing, thereby affecting the cell's capacity and energy density. Therefore, this invention controls the size A of the transition plane within the range of 5mm to 10mm, which not only improves the detection rate of blue film damage but also reduces the impact of space utilization rate inside the cell casing, ensuring the cell's capacity and energy density.
[0010] In one alternative embodiment, the dimensions of the planar sidewall are consistent with the dimensions of the transition plane along the height direction of the cell housing.
[0011] Beneficial effects: The dimensions of the planar sidewalls match those of the transition plane, meaning that once the transition plane connects two adjacent planar sidewalls, there are no gaps between them. This not only ensures good structural strength of the formed cell casing but also creates a sealed space inside the casing, helping to isolate internal structures such as electrode groups from the external environment and improving cell reliability. Furthermore, the matching dimensions of the planar sidewalls and the transition plane allow for a relatively large internal space, which is beneficial for increasing the cell's capacity and energy density.
[0012] In one optional embodiment, the number of planar sidewalls is four, and the four planar sidewalls include a pair of opposing first sidewalls and a pair of opposing second sidewalls; the area of the first sidewalls is larger than the area of the second sidewalls.
[0013] Beneficial effects: Compared to setting different specifications for the four planar sidewalls, this invention sets two specifications for the planar sidewalls of the battery cell casing. On the one hand, this simplifies the production mold and process flow, reduces mold development costs and production complexity, and improves manufacturing efficiency and yield. On the other hand, it allows workers or automated equipment to quickly confirm the assembly position of each planar sidewall, improving assembly efficiency and reducing assembly error rate. Furthermore, by making the area of the second sidewall smaller, this invention saves materials and reduces the overall weight of the battery cell casing while ensuring its structural strength.
[0014] In one alternative embodiment, both the planar sidewall and the transition plane are rectangular in shape.
[0015] Beneficial effects: The regular rectangular shape facilitates standardized and mass production of the battery cell casing, significantly reducing mold design and processing difficulty and improving production efficiency. Furthermore, during cell assembly, the rectangular sides allow adjacent cells to fit tightly together, reducing assembly gaps and improving space utilization, thereby increasing the energy density of the battery pack. Secondly, the rectangular shape of both the planar sidewalls and transition planes not only ensures uniform contact between the outer surface of the battery cell casing and the blue film, reducing the probability of damage to the blue film from protrusions or spikes on the casing, but also allows the outer surface of the battery cell casing to effectively adhere to the conductive cloth during testing, improving the detection rate of damaged areas on the blue film.
[0016] In one alternative embodiment, the connection between the planar sidewall and the transition plane is welded or integrally formed.
[0017] Beneficial effects: Connecting the planar sidewalls to the transition plane using welding not only ensures the connection strength but also guarantees the seal at the connection point, preventing electrolyte leakage and improving cell safety. Furthermore, using a one-piece molding process to manufacture the cell casing simplifies the production process, reduces assembly steps, increases production efficiency, and also lowers the defect rate caused by connecting multiple components.
[0018] Secondly, this utility model also provides a battery cell, comprising:
[0019] The aforementioned battery cell casing has an opening at at least one end;
[0020] Cover plate, covering and sealing the opening;
[0021] The blue film is wrapped around the outer wall of the battery cell casing.
[0022] Beneficial effects: The battery cell of this utility model includes the battery cell housing as described above, and has all the beneficial technical effects of the battery cell housing, which will not be repeated here.
[0023] In one alternative implementation, the battery cell is a prismatic cell or a blade cell.
[0024] Beneficial effects: By adjusting the transition arc surface of the cell shell of the square or blade cell to a transition plane, this utility model can not only reduce the probability of damage to the blue film on its surface and ensure the integrity of the blue film, thereby ensuring the reliability of the square or blade cell in subsequent use; at the same time, it can also improve the contact effect between the cell shell of the square or blade cell and the conductive cloth, ensuring that the potential for damage to the blue film can be detected in time, and improving the quality control in the cell production process.
[0025] Thirdly, this utility model also provides a battery pack, comprising: a plurality of the above-mentioned battery cells.
[0026] Beneficial effects: The battery pack of this utility model includes the battery cell as described above, and has all the beneficial technical effects of the battery cell, which will not be repeated here. Attached Figure Description
[0027] 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.
[0028] Figure 1 This is a schematic diagram of the structure of a battery cell housing according to an embodiment of the present utility model;
[0029] Figure 2 for Figure 1 A magnified view of N in the diagram;
[0030] Figure 3 for Figure 1 The diagram shows the structural schematic of the battery cell casing from another perspective.
[0031] Figure 4 for Figure 3 A magnified view of part M in the diagram.
[0032] Explanation of reference numerals in the attached figures:
[0033] 100. Cell casing; 101. Planar sidewall; 1011. First side surface; 1012. Second side surface; 102. Transition plane. Detailed Implementation
[0034] 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.
[0035] To address the problem that damage to the blue film located at the transition arc surface is difficult to detect, this utility model provides a cell housing, a cell, and a battery pack.
[0036] The following is combined with Figures 1 to 4 The following describes embodiments of the present invention.
[0037] According to embodiments of the present invention, on the one hand, such as Figures 1 to 4 As shown, a battery cell housing 100 is provided, including at least three planar sidewalls 101. Two adjacent planar sidewalls 101 are connected by a transition plane 102. An angle α is formed between the transition plane 102 and the adjacent planar sidewalls 101, and the value of α is in the range of 130°≤α≤145°.
[0038] Compared to existing transition arc surfaces, this embodiment of the invention sets the connection between two adjacent planar sidewalls 101 of the cell housing 100 as a transition plane 102. This increases the contact area between the connection between the two adjacent planar sidewalls 101 and the conductive cloth, improving the contact effect and thus increasing the detection rate of blue film damage, avoiding a decrease in cell reliability due to missed detection. Furthermore, by setting the included angle α between the transition plane 102 and the adjacent planar sidewalls 101 according to the above parameters, this embodiment of the invention allows the connection between the transition plane 102 and the adjacent planar sidewalls 101 to transition relatively smoothly, avoiding sharp corners of nearly 90° that could pierce the blue film, thereby improving the yield rate of the cell products.
[0039] It is understood that the cell casing 100 has an inner surface and an outer surface. The angle α between the transition plane 102 and the adjacent planar sidewall 101 mentioned above specifically refers to the angle formed between the inner surface of the transition plane 102 and the inner surface of the adjacent planar sidewall 101.
[0040] It should be noted that the number of planar sidewalls 101 in this embodiment can be, but is not limited to, three, four, or six. As long as a ring-shaped shell can be formed with the help of the transition plane 102, this utility model does not make any specific limitation.
[0041] It should be noted that, in this embodiment, the included angle α between the transition plane 102 and the adjacent plane sidewall 101 can be, but is not limited to, 130°, 131°, 132°, 133°, 134°, 135°, 136°, 137°, 138°, 139°, 140°, 141°, 142°, 143°, 144°, and 145°.
[0042] According to one embodiment of the present invention, such as Figures 1 to 4 As shown, along the circumference of the cell housing 100, the dimension of the planar sidewall 101 is larger than the dimension of the transition plane 102. The larger dimension of the planar sidewall 101 allows the cell housing 100 to form a more stable contact and support structure during assembly, enhancing the overall mechanical stability of the cell housing 100 and reducing the risk of internal structural displacement or deformation due to external impacts or vibrations. Furthermore, reducing the size of the transition plane 102 avoids it occupying excessive internal space in the cell housing 100, ensuring the cell's capacity and energy density.
[0043] According to one embodiment of the present invention, such as Figures 1 to 4 As shown, along the circumference of the cell housing 100, the dimension of the transition plane 102 is A, and the value of A ranges from 5mm to 10mm. If the dimension A of the transition plane 102 is less than 5mm, it means that during the test, the area where the transition plane 102 can contact the conductive cloth is relatively small, which is not conducive to improving the detection rate of blue film damage. Conversely, if the dimension A of the transition plane 102 is greater than 10mm, although it can increase the area where the transition plane 102 can contact the conductive cloth during the test and improve the detection rate of blue film damage, an excessively large transition plane 102 will affect the space utilization rate inside the cell housing 100, thereby affecting the capacity and energy density of the cell. Therefore, by controlling the dimension A of the transition plane 102 within the range of 5mm to 10mm, this embodiment of the present invention can not only improve the detection rate of blue film damage, but also reduce the impact of the space utilization rate inside the cell housing 100, thus ensuring the capacity and energy density of the cell.
[0044] It is understandable that when the detection rate of blue film damage is improved, it means that the blue film on the surface of the battery cells that pass the test is intact, which can improve the insulation withstand voltage reliability of the battery cells after assembly.
[0045] It should be noted that the dimension A of the transition plane 102 in this embodiment can be, but is not limited to, 5mm, 5.2mm, 5.5mm, 5.8mm, 6mm, 6.3mm, 6.5mm, 6.9mm, 7mm, 7.1mm, 7.5mm, 7.6mm, 8mm, 8.2mm, 8.5mm, 8.7mm, 9mm, 9.1mm, 9.3mm, 9.5mm, 9.7mm, 9.9mm, and 10mm.
[0046] According to one embodiment of this utility model, along the height direction of the cell housing 100, the dimensions of the planar sidewall 101 are consistent with the dimensions of the transition plane 102. It can be understood that the consistency between the dimensions of the planar sidewall 101 and the transition plane 102 means that when the transition plane 102 connects two adjacent planar sidewalls 101, there are no gaps between them. This not only ensures that the formed cell housing 100 has good structural strength, but also creates a sealed space inside the cell housing 100, thereby helping to isolate the internal structures of the cell housing 100, such as the electrode assembly, from the external environment and improving the reliability of the cell. Furthermore, the consistency between the dimensions of the planar sidewall 101 and the transition plane 102 also allows for a relatively large internal space within the cell housing 100, which is beneficial for increasing the cell's capacity and energy density.
[0047] According to one embodiment of the present invention, such as Figures 1 to 4 As shown, there are four planar sidewalls 101, including a pair of opposing first sidewalls 1011 and a pair of opposing second sidewalls 1012; the area of the first sidewall 1011 is larger than the area of the second sidewall 1012. Compared to setting the four planar sidewalls 101 to different specifications, this embodiment of the invention sets the planar sidewalls 101 of the cell housing 100 to two specifications. On the one hand, this simplifies the production mold and process flow, reduces mold development costs and production complexity, and improves manufacturing efficiency and yield; on the other hand, it facilitates workers or automated equipment to quickly confirm the assembly position of each planar sidewall 101, improving assembly efficiency and reducing assembly error rate. Furthermore, this embodiment of the invention reduces the area of the second sidewall 1012, which saves materials and reduces the overall weight of the cell housing 100 while ensuring the structural strength of the cell housing 100.
[0048] According to one embodiment of the present invention, such as Figures 1 to 4As shown, both the planar sidewall 101 and the transition plane 102 are rectangular. It can be understood that the regular rectangular shape facilitates standardized and mass production during the manufacturing process of the cell housing 100, significantly reducing the difficulty of mold design and processing, and improving production efficiency. Furthermore, when assembling cells, the rectangular sides allow adjacent cells to fit tightly together, reducing assembly gaps and improving space utilization, thereby increasing the energy density of the battery pack. Secondly, by setting both the planar sidewall 101 and the transition plane 102 to rectangular shapes, this embodiment not only ensures uniform contact between the outer surface of the cell housing 100 and the blue film, reducing the probability of the blue film being damaged by protrusions or spikes on the cell housing 100, but also allows the outer surface of the cell housing 100 to effectively adhere to the conductive cloth during testing, improving the detection rate of damaged areas on the blue film.
[0049] According to one embodiment of this utility model, the connection between the planar sidewall 101 and the transition plane 102 is welded or integrally formed. Welding the planar sidewall 101 and the transition plane 102 not only ensures the connection strength but also guarantees the sealing of the connection, preventing electrolyte leakage and improving cell safety. In contrast, integrally forming the cell housing 100 simplifies the production process, reduces assembly steps, improves production efficiency, and also reduces the defect rate caused by connecting multiple components.
[0050] According to an embodiment of the present invention, another aspect provides a battery cell, including: the aforementioned battery cell housing 100, cover plate, and blue film.
[0051] Specifically, at least one end of the aforementioned cell housing 100 is provided with an opening; a cover plate covers and seals the opening; and a blue film is wrapped around the outer wall of the cell housing 100.
[0052] The battery cell of this utility model embodiment includes the battery cell housing 100 as described above, and has all the beneficial technical effects of the battery cell housing 100, which will not be repeated here.
[0053] According to one embodiment of the present invention, the battery cell is a prismatic battery cell or a blade battery cell. This embodiment of the present invention adjusts the transition arc surface of the battery cell housing 100 of the prismatic or blade battery cell to a transition plane 102, which not only reduces the probability of damage to the surface blue film and ensures the integrity of the blue film, thereby guaranteeing the reliability of the prismatic or blade battery cell in subsequent use; it also improves the contact effect between the battery cell housing 100 and the conductive cloth, ensuring that potential blue film damage can be detected in a timely manner and improving quality control during the battery cell production process.
[0054] According to an embodiment of the present invention, in another aspect, a battery pack is also provided, comprising a plurality of the above-described battery cells. The battery pack of this embodiment includes the battery cells as described above, possessing all the beneficial technical effects of such battery cells, which will not be repeated here.
[0055] The technical effects of this utility model will be described below with reference to specific embodiments and comparative examples.
[0056] Table 1
[0057]
[0058] 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 cell housing, characterized in that, It includes at least three planar sidewalls, with two adjacent planar sidewalls connected by a transition plane, and the transition plane and the adjacent planar sidewalls forming an angle α, where the value of α ranges from 130° to 145°. Along the circumference of the cell casing, the dimension of the transition plane is A, and the value of A ranges from 5 mm to 10 mm.
2. The cell housing according to claim 1, characterized in that, Along the circumference of the cell casing, the dimension of the planar sidewall is larger than the dimension of the transition plane.
3. The cell housing according to claim 2, characterized in that, Along the height direction of the cell casing, the dimensions of the planar sidewall are consistent with the dimensions of the transition plane.
4. The cell housing according to claim 1, characterized in that, The number of planar sidewalls is four, and the four planar sidewalls include a pair of opposing first sidewalls and a pair of opposing second sidewalls; the area of the first sidewall is greater than the area of the second sidewall.
5. The cell housing according to claim 4, characterized in that, Both the planar sidewall and the transition plane are rectangular in shape.
6. The cell housing according to any one of claims 1 to 5, characterized in that, The connection between the planar sidewall and the transition plane is welded or integrally formed.
7. A battery cell, characterized in that, include: The battery cell housing according to any one of claims 1 to 6 has an opening at at least one end; Cover plate, covering and sealing the opening; The blue film is wrapped around the outer wall of the battery cell casing.
8. The battery cell according to claim 7, characterized in that, The battery cell is a square battery cell or a blade battery cell.
9. A battery pack, characterized in that, include: The battery cell according to any one of claims 7 or 8.