Battery cell and battery pack

Abstract

The utility model relates to battery technology field discloses a kind of battery cell and battery pack, battery cell includes: shell, with two narrow sides of relative arrangement;Partition, be in the inside of shell, the edge of partition two sides is fixed respectively with two narrow sides, to be separated into several sub-chambers with the inside of shell;Pole group unit, pole group unit is equipped with several, several pole group units are respectively arranged in several sub-chambers;Battery cell and battery pack provided by the utility model, several pole group units are respectively placed in several sub-chambers, reach the purpose of making pole group layering block, compared with original pole group whole, thickness is small in each pole group unit, electrolyte only needs to penetrate short distance to reach the center of each pole group unit, avoid pole group unit injection infiltration uneven, not completely;At the same time, the reinforcing rib plate between the two narrow sides of partition provides support for narrow side, while strengthening the structural strength of narrow side, prevent narrow side from being concave or distorted when battery pack receives external force.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a battery cell and battery pack. Background Technology

[0002] A battery cell typically consists of a casing, electrode assembly, and cover plate; the cover plate is welded to the casing as a whole to form a space that accommodates the electrode assembly.

[0003] In related technologies, during the cell manufacturing process, due to the compact internal structure and certain volume of the electrode assembly, it is difficult for the electrolyte to wet the center of the electrode assembly. As a result, the electrode assembly is prone to problems such as uneven or incomplete electrolyte wetting, which affects battery performance. Utility Model Content

[0004] In view of this, the present invention provides a battery cell and a battery pack to solve the problem that uneven and incomplete electrolyte wetting of the electrode groups is prone to occur during the manufacturing of the battery cell.

[0005] In a first aspect, the present invention provides a battery cell, comprising: a housing having two narrow sides disposed opposite to each other; a partition disposed inside the housing, wherein the two sides of the partition are respectively fixed to the two narrow sides to divide the interior of the housing into a plurality of compartments; and a plurality of electrode units, wherein the plurality of electrode units are respectively disposed in the plurality of compartments.

[0006] Beneficial effects: By setting a partition inside the casing and fixing both ends of the partition to two narrow sides, the interior of the casing is divided into several cavities, while the partition acts as a support, improving the load-bearing capacity of the narrow sides. In traditional cells, the interior of the casing is a single cavity, and the electrode assembly is a whole and placed inside the cavity. In this embodiment, the partition divides the cavity of the casing into several cavities, thereby prompting the electrode assembly to be set as several independent electrode assembly units. Several electrode assembly units are placed in several cavities, achieving the purpose of layering and segmenting the electrode assembly. As a result, in the cell manufacturing process, each electrode assembly unit is thinner than the original electrode assembly as a whole, and the electrolyte only needs to penetrate a shorter distance to reach the center of each electrode assembly unit, avoiding defects such as uneven or incomplete liquid injection and wetting of the electrode assembly units. At the same time, the partition acts as a reinforcing rib between the two narrow sides, providing support for the narrow sides and strengthening the structural strength of the narrow sides, preventing the narrow sides from denting or twisting when the battery pack is subjected to external forces, thereby effectively improving the stability and safety of the cell.

[0007] In one optional embodiment, the wall thickness of the shell is H, and the thickness of the partition is h, satisfying (0.5×H)≤h≤(2×H).

[0008] Beneficial effects: The thickness h of the separator is selected within the range of (0.5×H)≤h≤(2×H). This setting ensures that the separator provides effective support strength for the narrow side while also ensuring that the thickness of the separator is appropriate, thus avoiding affecting the utilization rate of the internal space of the housing. If the thickness h of the separator is too small, such as less than (0.5×H), the separator will not provide sufficient support for the narrow side, and the narrow side will be easily deformed under external force. If the thickness h of the separator is too large, such as greater than (2×H), the separator will occupy too much space inside the housing, affecting the arrangement of the electrode units and thus reducing the overall energy density of the cell.

[0009] In one optional embodiment, the wall thickness H of the housing is in the range of 0.15mm ≤ H ≤ 1mm.

[0010] Beneficial effects: The wall thickness H of the casing should be in the range of 0.15mm ≤ H ≤ 1mm. This setting ensures that the casing has sufficient structural strength while maintaining a moderate weight. If the wall thickness H is too small, such as less than 0.15mm, the structural strength of the casing will be insufficient, and the casing will be prone to deformation or damage. If the wall thickness H is too large, such as greater than 1mm, the weight of the casing will be too large, increasing the overall weight of the battery pack and affecting its portability.

[0011] In one optional embodiment, the two narrow side surfaces are respectively formed on opposite sides of the housing along the z-direction; the housing also includes two large surfaces arranged opposite each other along the y-direction; wherein, a plurality of partitions are provided, and the narrow side surfaces, the large surfaces and the partitions enclose the cavity to form the sub-cavity, or the two narrow side surfaces and the two adjacent partitions enclose the cavity to form the sub-cavity.

[0012] Beneficial effects: Several partitions are provided, which divide the interior of the shell into multiple cavities. Each cavity can be formed by the partitions, narrow side panels, and large side panels, or by the narrow side panels and two adjacent partitions, ensuring that there are mutually separated placement spaces. This facilitates the independent arrangement of each electrode unit. While ensuring that the electrode units are evenly and thoroughly wetted, the electrode units are isolated from each other, reducing mutual influence in the event of thermal runaway and improving the safety of the cell.

[0013] In one optional implementation, the width of the narrow side is W1 along the y-direction; the width of the large side is W2 along the z-direction; and in a cross section perpendicular to the x-direction, the partition and the narrow side have an angle θ, wherein the value of angle θ is in the range of arctan(W2 / W1) ≤ θ ≤ 90°.

[0014] Beneficial effects: The angle θ between the separator and the narrow side is in the range of arctan(W2 / W1)≤θ≤90°. This setting ensures that the separator is adapted to the internal space layout of the cell and effectively plays a supporting role. At the same time, it can flexibly adjust the angle according to the needs of different electrode units and the narrow side. By adjusting the value of the angle θ, the shape of the electrode unit and the supporting effect of the separator on the narrow side can be changed, thereby improving the liquid injection and wetting effect of the electrode unit and ensuring effective support for the narrow side.

[0015] In one alternative embodiment, the pole group unit has a first surface on the side opposite to the narrow side, and a second surface on the side opposite to the partition plate, the second surface being connected to the first surface; in a cross section perpendicular to the x-direction, the second surface and the first surface are positioned at the angle θ.

[0016] Beneficial effects: The shape of the pole unit is compatible with the arrangement of the partition. The angle between the second surface and the first surface is the same as the angle θ between the partition and the narrow side, ensuring that the pole unit is smoothly installed into the cavity and preventing friction or even interference between the pole unit and the partition or the narrow side. After the pole unit is installed in the housing, the second surface is parallel to the partition and spaced apart, and the first surface is parallel to the narrow side and spaced apart, ensuring that the pole unit is stably installed in the cavity.

[0017] In one alternative embodiment, the housing has an opening at at least one end along the x-direction; the cell further includes a cover plate assembly connected to the housing and sealing the opening; along the x-direction, the end of the partition near the opening is spaced apart from the end of the housing with the opening.

[0018] Beneficial effects: The partition is spaced apart from the two ends of the housing to allow for the installation space between the cover assembly and the housing, preventing interference between the cover assembly and the partition and ensuring that the cover assembly seals the opening.

[0019] In one optional embodiment, the distance between the end of the partition near the opening and the end of the housing with the opening is D, satisfying 5mm≤D≤15mm.

[0020] Beneficial effect: The distance between the end of the partition near one of the openings and the end of the housing with the opening is D. The value of D is in the range of 5mm≤D≤15mm. This setting ensures that there is enough installation space for the cover plate assembly, while also ensuring that the partition has sufficient length in the x-direction to ensure sufficient support strength.

[0021] In one optional embodiment, the width W1 of the narrow side is in the range of 12mm≤W1≤30mm; the width W2 of the large side is in the range of 80mm≤W2≤160mm; and the length of the shell along the x-direction is L, which is in the range of 300mm≤L≤1000mm.

[0022] Beneficial effect: The width W1 of the narrow side is in the range of 12mm≤W1≤30mm. This setting ensures that the narrow side has sufficient strength while also ensuring that the width of the narrow side is moderate, thus avoiding material waste.

[0023] Secondly, this utility model also provides a battery pack, comprising: a battery cell as described in any of the above claims, wherein a plurality of the battery cells are arranged along the y-direction to form a module; an upper cover and a lower shell that are snapped together, wherein the module is located between the upper cover and the lower shell, and the upper cover and the lower shell are respectively disposed in contact with two narrow sides of the battery cell.

[0024] Beneficial effects: When the top or bottom cover of the battery pack is subjected to external force, the force is applied to the narrow side of the cell. The two ends of the separator are fixed to the two narrow sides respectively, effectively supporting the narrow side and preventing deformation of the narrow side. This improves the structural stability of the battery pack, ensures that the cell maintains normal operation when subjected to external force, and extends the service life of the battery pack. 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 schematic diagram of the battery cell of this utility model; Figure 2 This is a disassembly diagram of the battery cell of this utility model; Figure 3 This is a schematic diagram of the housing of this utility model; Figure 4 This is a side view of the housing of this utility model; Figure 5 This is a schematic diagram of the pole group unit of this utility model; Figure 6 This is a cross-sectional view of the pole group unit of this utility model; Figure 7 This is a schematic diagram of the lower shell according to an embodiment of the present invention; Figure 8 This utility model Figure 7Side view of the housing shown; Figure 9 This is a schematic diagram of the lower shell according to another embodiment of the present invention; Figure 10 This is a schematic diagram of the lower shell of another embodiment of the present invention; Figure 11 This is a front view of the casing of this utility model; Figure 12 This utility model Figure 11 Sectional view at point AA; Figure 13 This is an exploded view of the battery pack of this utility model; Figure 14 This is a schematic diagram of the battery pack of this utility model.

[0027] Explanation of reference numerals in the attached figures: 1. Shell; 11. Large surface; 12. Narrow side surface; 13. Opening; 2. Separator; 3. Electrode unit; 31. First surface; 32. Second surface; 33. Positive electrode; 34. Negative electrode; 35. Separator; 4. Cover assembly; 5. Top cover; 6. Lower shell; 7. Module; 8. Cavity. Detailed Implementation

[0028] 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.

[0029] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0032] The following is combined with Figures 1 to 14 The following describes embodiments of the present invention.

[0033] According to an embodiment of the present invention, a battery cell is provided, comprising: a housing 1 having two narrow sides 12 disposed opposite to each other; a partition 2 disposed inside the housing 1, the two sides of the partition 2 being fixed to the two narrow sides 12 respectively to divide the interior of the housing 1 into a plurality of cavities 8; and a pole group unit 3 having a plurality of pole group units 3, the plurality of pole group units 3 being disposed in the plurality of cavities 8 respectively.

[0034] It should be noted that in the relevant technology, multiple cells form a battery pack. The narrow side of the cell bears the external force on the battery pack. However, the strength of the narrow side is limited. The narrow side refers to the two opposite sides of the cell with a small area. When the battery pack is subjected to external force, the narrow side of the cell is prone to dent or twist.

[0035] In this embodiment, by providing a partition 2 inside the housing 1 and fixing the two sides of the partition 2 along the z-direction to the two narrow side surfaces 12 respectively, the interior of the housing 1 is divided into several cavities 8, while the partition 2 provides support, improving the load-bearing capacity of the narrow side surfaces 12. In traditional battery cells, the interior of the housing 1 is a single cavity, and the electrode assembly is a whole and set inside the cavity. In this embodiment, the partition 2 divides the cavity of the housing 1 into several cavities 8, thereby causing the electrode assembly to be set into several independent electrode assembly units 3, and the several electrode assembly units 3 are respectively placed in several cavities 8. In this process, the electrode group is divided into layers and blocks. As a result, in the cell manufacturing process, each electrode group unit 3 is thinner than the original electrode group as a whole. The electrolyte only needs to penetrate a shorter distance to reach the center of each electrode group unit 3, avoiding defects such as uneven or incomplete liquid injection in the electrode group unit 3. At the same time, the separator 2 acts as a reinforcing rib between the two narrow sides 12, providing support for the narrow sides 12 and strengthening the structural strength of the narrow sides 12. This prevents the narrow sides 12 from denting or twisting when the battery pack is subjected to external forces, thereby effectively improving the stability and safety of the cell.

[0036] In some embodiments, combined with Figure 9 As shown, the wall thickness of shell 1 is H, and the thickness of partition 2 is h, satisfying (0.5×H)≤h≤(2×H).

[0037] In this embodiment, the wall thickness of the shell 1 is the same at all locations, which is H; the thickness h of the partition 2 is selected within the range of (0.5×H)≤h≤(2×H). This setting ensures that the partition 2 provides effective support strength for the narrow side 12 while also ensuring that the thickness of the partition 2 is appropriate, thus avoiding affecting the utilization rate of the internal space of the shell 1.

[0038] It is worth noting that if the thickness h of the separator 2 is too small, such as less than (0.5×H), the separator 2 will not provide sufficient support for the narrow side 12, and the narrow side 12 will be easily deformed under external force. If the thickness h of the separator 2 is too large, such as greater than (2×H), the separator 2 will occupy too much space inside the housing 1, affecting the arrangement of the electrode unit 3, and thus reducing the overall energy density of the cell.

[0039] In some embodiments, combined with Figure 9 As shown, the wall thickness H of the shell 1 ranges from 0.15mm ≤ H ≤ 1mm.

[0040] In this embodiment, the wall thickness H of the shell 1 is in the range of 0.15mm≤H≤1mm. This setting ensures that the shell 1 has sufficient structural strength while also ensuring that the weight of the shell 1 is moderate.

[0041] It is worth noting that if the wall thickness H of the casing 1 is too small, such as less than 0.15mm, the structural strength of the casing 1 will be insufficient, and the casing 1 will be easily deformed or damaged. If the wall thickness H is too large, such as greater than 1mm, the weight of the casing 1 will be too large, increasing the overall weight of the battery pack and affecting the portability of the battery pack.

[0042] In some embodiments, combined with Figure 1 As shown, two narrow side surfaces 12 are formed on opposite sides of the housing 1 along the z direction; the housing 1 also includes two large surfaces 11 arranged opposite each other along the y direction; wherein, several partitions 2 are provided, and the narrow side surfaces 12, the large surfaces 11 and the partitions 2 enclose a cavity 8, or the two narrow side surfaces 12 and the two adjacent partitions 2 enclose a cavity 8.

[0043] It should be noted that, in combination Figure 4 , Figure 8 and Figure 9 As shown, there can be one partition 2. One partition 2 divides the interior of the housing 1 into two sub-cavities 8. Each sub-cavity 8 is arranged with a pole group unit 3. The sub-cavity 8 is formed by the narrow side 12, the large side 11 and the partition 2.

[0044] Specifically, such as Figure 4 As shown, one edge of partition 2 is fixed to the left side of one narrow side 12, and the other edge of partition 2 is fixed to the right side of another narrow side 12, forming a triangle between partition 2, narrow side 12, and large surface 11; Figure 8 As shown, one edge of partition 2 is fixed at an angle θ to the middle plate of one narrow side 12, where angle θ is an acute angle, and the middle plate is the plate between the left and right sides of the narrow side 12. The other edge of partition 2 is fixed to the middle plate of another narrow side 12. Figure 9 As shown, one edge of the partition is vertically fixed to the middle plate of one narrow side 12, and the other edge of the partition is vertically fixed to the middle plate of the other narrow side 12.

[0045] Additionally, it should be noted that, in combination Figure 10 As shown, there can be two partitions 2. The two partitions 2 divide the interior of the housing 1 into three cavities 8. Each cavity 8 is equipped with a pole group unit 3. The narrow side 12, the large side 11 and the partitions 2 enclose each other to form two cavities 8. The narrow side 12 and the two adjacent partitions 2 enclose each other to form one cavity 8.

[0046] In this embodiment, several partitions 2 are provided, and the several partitions 2 divide the interior of the housing 1 into multiple cavities 8. The cavities 8 can be formed by the partitions 2, the narrow side 12 and the large surface 11, or by the narrow side 12 and two adjacent partitions 2, to ensure that there are mutually separated placement spaces, so that each electrode unit 3 can be arranged independently. While ensuring that the electrode unit 3 is evenly and thoroughly wetted by liquid injection, the electrode units 3 are isolated from each other, reducing the mutual influence in the event of thermal runaway and improving the safety of the battery cell.

[0047] In some embodiments, combined with Figure 4 As shown, along the y-direction, the width of the narrow side 12 is W1; along the z-direction, the width of the large surface 11 is W2; in the section perpendicular to the x-direction, there is an angle θ between the partition 2 and the narrow side 12, where the value of the angle θ is in the range of arctan(W2 / W1)≤θ≤90°.

[0048] It should be noted that within the cross-section perpendicular to the x-direction, the partition 2 and the narrow side 12 are positioned at an angle θ; combined with Figure 4As shown, one end of partition 2 is fixed to the left side of one of the narrow side faces 12, and the other end of partition 2 is fixed to the right side of another narrow side face 12. A triangle is formed between partition 2, narrow side face 12 and large face 11. The angle θ between partition 2 and narrow side face 12 is arctan(W2 / W1), which is also the minimum value of the angle θ between partition 2 and narrow side face 12. Here, arctan(x) is the arctangent function, which refers to the angle with a tangent value of x.

[0049] It should be noted that, in combination Figure 9 As shown, the two ends of the partition 2 are fixed perpendicularly to the two narrow sides 12 respectively, and the angle θ between the partition 2 and the narrow sides 12 is 90°, which is also the maximum value of the angle θ between the partition 2 and the narrow sides 12. Figure 8 The angle θ between the partition 2 shown and the narrow side 12 is the midpoint between arctan(W2 / W1) and 90°.

[0050] In this embodiment, the angle θ between the partition 2 and the narrow side 12 is in the range of arctan(W2 / W1)≤θ≤90°. This setting ensures that the partition 2 is adapted to the internal space layout of the battery cell and effectively plays a supporting role. At the same time, it can flexibly adjust the angle according to the needs of different electrode units 3 and narrow side 12. By adjusting the value of the angle θ, the shape of the electrode unit 3 and the supporting effect of the partition 2 on the narrow side 12 can be changed, thereby improving the liquid injection and wetting effect of the electrode unit 3 and ensuring effective support for the narrow side 12.

[0051] In some embodiments, combined with Figure 5 As shown, a first surface 31 is formed on the side of the pole unit 3 opposite to the narrow side 12, and a second surface 32 is formed on the side of the pole unit 3 opposite to the partition 2. The second surface 32 is connected to the first surface 31. In a cross section perpendicular to the x-direction, the second surface 32 and the first surface 31 are set at an angle θ.

[0052] In this embodiment, the shape of the pole unit 3 is adapted to the arrangement of the partition 2. The angle between the second surface 32 and the first surface 31 is the same as the angle θ between the partition 2 and the narrow side surface 12, ensuring that the pole unit 3 is smoothly installed into the cavity 8 and preventing the pole unit 3 from rubbing against or even interfering with the partition 2 or the narrow side surface 12. After the pole unit 3 is installed in the housing, the second surface 32 is parallel to the partition 2 and spaced apart, and the first surface 31 is parallel to the narrow side surface 12 and spaced apart, ensuring that the pole unit 3 is stably installed in the cavity 8.

[0053] It should be noted that the internal structure and shape of the electrode assembly are adapted to each other, combined with Figure 6 As shown, in this embodiment, the positive electrode 33, negative electrode 34 and separator 35 inside the electrode unit 3 are stacked together, and the lengths of the positive electrode 33, negative electrode 34 and separator 35 decrease sequentially along the stacking direction at the end closest to the second surface 32.

[0054] In some embodiments, combined with Figure 2 As shown, along the x-direction, the housing 1 has an opening 13 at at least one end; the battery cell also includes a cover plate assembly 4, which is connected to the housing 1 and seals the opening 13; along the x-direction, the end of the partition plate 2 near the opening 13 is spaced apart from the end of the housing 1 with the opening 13.

[0055] In this embodiment, the housing 1 has openings 13 on both sides along the x-direction, and two cover plate assemblies 4 are provided. The two cover plate assemblies 4 are respectively connected to the openings 13 at both ends of the housing 1 and block the openings 13. Along the x-direction, the two ends of the partition plate 2 are respectively spaced apart from the two ends of the housing 1 to leave installation space between the cover plate assembly 4 and the housing 1, prevent the cover plate assembly 4 from interfering with the partition plate 2, and ensure that the cover plate assembly 4 blocks the openings 13.

[0056] In some embodiments, combined with Figure 12 As shown, the distance between the end of the partition 2 near the opening 13 and the end of the housing 1 with the opening 13 is D, which satisfies 5mm≤D≤15mm.

[0057] In this embodiment, the distance between the end of the partition 2 near one of the openings 13 and the end of the housing 1 with the opening 13 is D. The value of D is in the range of 5mm≤D≤15mm. This setting ensures that there is enough installation space for the cover plate assembly 4, while also ensuring that the partition 2 has sufficient length in the x direction to ensure sufficient support strength.

[0058] It is worth noting that if the spacing D is too small, such as less than 5mm, it may cause difficulties in installing the cover assembly 4, interference between the cover assembly 4 and the partition 2, or even failure of the cover assembly 4 to effectively seal the opening 13. If the spacing D is too large, such as greater than 15mm, it may cause insufficient length of the partition 2, which in turn weakens the support strength of the partition 2 and affects the stability of the battery cell.

[0059] In some embodiments, combined with Figure 4 As shown, the width W1 of the narrow side 12 is in the range of 12mm≤W1≤30mm; the width W2 of the large side 11 is in the range of 80mm≤W2≤160mm; along the x-direction, the length of the shell 1 is L, and the length L is in the range of 300mm≤L≤1000mm.

[0060] In this embodiment, the width W1 of the narrow side 12 is in the range of 12mm≤W1≤30mm. This setting ensures that the narrow side 12 has sufficient strength while also ensuring that the width of the narrow side 12 is moderate, thus avoiding material waste.

[0061] It is worth noting that if the width W1 of the narrow side 12 is too small, such as less than 12mm, the narrow side 12 may be insufficient in strength, affecting the overall structural stability; if the width W1 is too large, such as greater than 30mm, it may lead to material waste and increased costs.

[0062] In this embodiment, the width W2 of the large surface 11 is in the range of 80mm≤W2≤160mm. This setting ensures that the large surface 11 has sufficient strength while also ensuring that the width of the large surface 11 is moderate, thus avoiding material waste.

[0063] It is worth noting that if the width W2 of the large surface 11 is too small, such as less than 80mm, the strength of the large surface 11 may be insufficient, affecting the overall structural stability; if the width W2 is too large, such as greater than 160mm, it may lead to material waste and increased costs.

[0064] In this embodiment, the length L of the shell 1 is in the range of 300mm≤L≤1000mm. This setting ensures that the shell 1 has sufficient strength while also ensuring that the length of the shell 1 is appropriate, thus avoiding material waste.

[0065] It is worth noting that if the length L of the shell 1 is too small, such as less than 300mm, the shell 1 may be insufficient in strength, affecting the overall structural stability; if the length L is too large, such as greater than 1000mm, it may lead to material waste and increased costs.

[0066] According to an embodiment of the present invention, another aspect provides a battery pack, comprising: a battery cell as described above, wherein a plurality of battery cells are arranged along the y-direction to form a module 7; an upper cover 5 and a lower shell 6 that are fastened together, wherein the module 7 is located between the upper cover 5 and the lower shell 6, and the upper cover 5 and the lower shell 6 are respectively disposed in contact with two narrow sides 12 of the battery cell.

[0067] In this embodiment, multiple battery cells are arranged along the y-direction to form a module 7. The multiple modules 7 are installed between the upper cover 5 and the lower shell 6. The upper cover 5 and the lower shell 6 are respectively abutted against the two narrow sides 12 of the battery cells. When the upper cover 5 or the lower shell 6 of the battery pack is subjected to external force, the external force is applied to the narrow side 12 of the battery cells. By setting a partition 2, the two ends of the partition 2 are respectively fixed to the two narrow sides 12, which effectively supports the narrow side 12 to bear the load, avoids the deformation of the narrow side 12, improves the structural stability of the battery pack, ensures that the battery cells maintain normal working condition when subjected to external force, and extends the service life of the battery pack.

[0068] Obviously, the above embodiments are merely examples for clear illustration and are not intended to limit the implementation. 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 all such modifications and variations fall within the scope defined by the present invention.

Claims

1. A battery cell, characterized in that, include: The housing has two narrow sides that are positioned opposite each other; A partition is disposed inside the housing, and the two sides of the partition are respectively fixed to the two narrow sides to divide the interior of the housing into several compartments; The pole group unit is provided in a plurality of units, and the plurality of pole group units are respectively disposed in a plurality of sub-cavities.

2. The battery cell according to claim 1, characterized in that, The wall thickness of the shell is H, and the thickness of the partition is h, satisfying (0.5×H)≤h≤(2×H).

3. The battery cell according to claim 2, characterized in that, The wall thickness H of the shell is in the range of 0.15mm ≤ H ≤ 1mm.

4. The battery cell according to any one of claims 1 to 3, characterized in that, The two narrow side surfaces are respectively formed on opposite sides of the housing along the z-direction; The housing also includes two large surfaces arranged opposite each other along the y-direction; The partition is provided in several parts, and the narrow side, the large side and the partition together form the cavity, or the two narrow side and the two adjacent partitions together form the cavity.

5. The battery cell according to claim 4, characterized in that, Along the y-direction, the width of the narrow side is W1; Along the z-direction, the width of the large surface is W2; In a cross section perpendicular to the x-direction, there is an angle θ between the partition and the narrow side, wherein the value of angle θ is in the range of arctan(W2 / W1)≤θ≤90°.

6. The battery cell according to claim 5, characterized in that, The pole group unit has a first surface on the side opposite to the narrow side, and a second surface on the side opposite to the partition plate, the second surface being connected to the first surface; In a cross section perpendicular to the x-direction, the second surface is positioned at the angle θ between the first surface and the second surface.

7. The battery cell according to claim 6, characterized in that, Along the x-direction, the housing has an opening at at least one end; The battery cell also includes a cover plate assembly, which is connected to the housing and seals the opening; Along the x-direction, the end of the partition near the opening is spaced apart from the end of the housing where the opening is located.

8. The battery cell according to claim 7, characterized in that, The distance between the end of the partition near the opening and the end of the housing with the opening is D, which satisfies 5mm≤D≤15mm.

9. The battery cell according to claim 5, characterized in that, The width W1 of the narrow side is in the range of 12mm≤W1≤30mm; The width W2 of the large surface is in the range of 80mm≤W2≤160mm; Along the x-direction, the length of the shell is L, and the value of the length L is in the range of 300mm≤L≤1000mm.

10. A battery pack, characterized in that, include: As described in any one of claims 1 to 9, a plurality of said battery cells are arranged along the y-direction to form a module; The module is located between the upper cover and the lower shell, which are connected by a snap-fit ​​mechanism. The upper cover and the lower shell are respectively abutted against the two narrow sides of the battery cell.

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