Battery cell structure and battery

Abstract

The utility model relates to the technical field of energy storage equipment, in particular to a battery cell structure which comprises A pole groups, the A pole groups are sequentially arranged in the length direction of the A pole groups, receding grooves are formed in the end faces, close to each other, of any two adjacent pole groups, and a receding space is jointly formed by any two adjacent receding grooves. The tabs of the two pole groups respectively extend out of the bottoms of the two avoiding grooves and are electrically connected in the avoiding space, and A is a positive integer greater than or equal to 2. The utility model further provides a battery which comprises a battery shell and the battery cell structure, and the battery cell structure is arranged in the battery shell. The battery cell structure of the battery has a relatively long length, can prevent the bending deformation of the pole group or the pole piece, ensures the quality stability, can reduce the occupied space at the connecting part of the pole lugs, and improves the energy density.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage equipment, in particular to a battery core structure and a battery. Background Art

[0002] Lithium batteries are widely used in applications such as electric vehicles. As a core component, the cell structure and its structural design are crucial to the quality and safety of lithium-ion batteries. Existing cells are generally short, limiting the space for increasing overall capacity. Longer cells, on the other hand, have longer electrode groups. Increasing the length of the electrode group can easily lead to quality issues such as bending and deformation of the electrode group or electrode sheets, resulting in reduced yield. Furthermore, using C- or S-shaped tab connections takes up more space, reducing energy density. Utility Model Content

[0003] One purpose of the present utility model is to provide a battery core structure with a longer length, which can prevent the pole group or pole piece from bending and deforming, ensure the stability of quality, reduce the space occupied by the pole ear connection, and improve the energy density.

[0004] To achieve this purpose, the present invention adopts the following technical solutions:

[0005] Provided is a battery cell structure, comprising:

[0006] A pole groups are arranged in sequence along their own length direction, and any two adjacent pole groups have avoidance grooves on their adjacent end faces, and any two adjacent avoidance grooves together form an avoidance space, and the pole ears of the two pole groups extend from the bottom of the two avoidance grooves respectively and are electrically connected in the avoidance space, and A is a positive integer greater than or equal to 2.

[0007] Optionally, it also includes A-1 partition support assemblies, which are arranged one-to-one in the gaps between the A pole groups. Each of the partition support assemblies is provided with an accommodating space, which is opened along the length direction of the pole group and is used to accommodate the pole ears.

[0008] Optionally, each of the partition support assemblies includes two partition members, each of the partition members is provided with a receiving groove, and when the two partition members are butted together, the two receiving grooves are butted together to form the receiving space.

[0009] Optionally, each of the partition members includes a receiving portion, the receiving portion includes a bottom plate and protruding side edges arranged on both sides of the bottom plate, the bottom plate is the bottom of the receiving groove, and the protruding side edges are side walls of the receiving groove.

[0010] Optionally, a support frame is further included, and the support frame is arranged around the outside of the A pole groups, and the support frame does not block the side surface of the pole group with the largest area.

[0011] Optionally, a guide groove is provided on the inner wall of the support frame, and the guide groove is opened through along a first direction, the first direction is perpendicular to the side surface of the largest area of ​​the pole group, and the partition support component is partially movably inserted into the guide groove.

[0012] Optionally, a height H of the side wall of the guide groove along a second direction satisfies 1 mm < H < 5 mm, the second direction is perpendicular to the first direction, and the second direction is perpendicular to the length direction of the pole group.

[0013] Optionally, a thickness M of a portion of the partition support assembly inserted into the guide groove along a third direction satisfies 0.8 mm < M < 3 mm, and the third direction is the length direction of the pole group.

[0014] Optionally, an inner insulating film is further included, which is cylindrical and sleeved on the outer sides of the support frame and the A pole groups, and the penetration direction of the inner insulating film is parallel to the length direction of the pole group.

[0015] Another object of the present invention is to provide a battery whose cell structure has a longer length and can prevent the pole group or pole piece from bending and deforming, thereby ensuring the stability of quality, and can reduce the space occupied by the pole tab connection and improve the energy density.

[0016] To achieve this purpose, the present invention adopts the following technical solutions:

[0017] A battery is provided, comprising a battery casing and the above-mentioned battery core structure, wherein the battery core structure is arranged in the battery casing.

[0018] Beneficial effects of the utility model:

[0019] The utility model provides a battery cell structure, including A pole groups, which are arranged in sequence along their own length direction, and the end faces of any two adjacent pole groups that are close to each other are provided with avoidance grooves, and any two adjacent avoidance grooves together form an avoidance space, and the pole ears of the two pole groups extend from the bottom of the two avoidance grooves respectively, and are electrically connected in the avoidance space, and A is a positive integer greater than or equal to 2. By increasing the number of pole groups and arranging them in sequence in the length direction of the pole groups, the capacity and length of a single battery cell can be increased, and the provision of multiple pole groups can prevent the quality risk of bending and deformation of the pole group or pole piece caused by the provision of an overly long pole group, thereby ensuring the stability of the battery cell quality. By providing an avoidance space to accommodate the pole ears, the additional space required for the pole ears can be reduced, thereby improving the energy density.

[0020] The utility model provides a battery comprising a battery housing and the aforementioned battery cell structure, wherein the battery cell structure is disposed within the battery housing. The battery cell structure has a long length and can prevent bending and deformation of the electrode group or electrode sheet, thereby ensuring quality stability, and can reduce the space occupied by the electrode tab connection, thereby improving energy density. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a partial structural explosion of the battery cell structure provided by the embodiment of the utility model Figure 1 ;

[0022] Figure 2 It is a structural diagram of the electrode group provided by an embodiment of the present utility model;

[0023] Figure 3 This is a partial structural diagram of the battery cell structure provided by an embodiment of the present utility model;

[0024] Figure 4 This is a partial structural explosion of the battery cell structure provided by the embodiment of the utility model Figure 2 ;

[0025] Figure 5 yes Figure 4 Enlarged view of point A in the middle;

[0026] Figure 6 This is a schematic structural diagram of a partition provided by an embodiment of the present utility model;

[0027] Figure 7 This is a schematic structural diagram of a support frame provided by an embodiment of the present utility model;

[0028] Figure 8 yes Figure 7 Enlarged view of point B in the middle;

[0029] Figure 9 It is an exploded view of the battery cell structure provided by an embodiment of the present utility model.

[0030] In the picture:

[0031] 1. Pole group; 11. Avoidance groove; 12. Pole ear;

[0032] 2. Partition support assembly; 21. Partition member; 211. Accommodation portion; 2111. Bottom plate; 2112. Protruding side edge; 2113. Accommodation groove; 212. Guide portion; 213. Reinforcement portion;

[0033] 3. Support frame; 31. Side plate; 311. Guide groove; 32. End plate; 321. Avoidance hole;

[0034] 4. Inner insulating film; 5. Cover plate; 51. Pole; 52. Explosion-proof hole; 6. Shell. DETAILED DESCRIPTION

[0035] The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention, and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of it.

[0036] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed or detachable connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0037] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0038] Existing battery cells are generally short, limiting the space for increasing overall capacity. Longer cells, however, require longer electrode groups. Increasing the length of the electrode groups can easily lead to quality issues such as bending and deformation of the electrode groups or electrode sheets, resulting in reduced yield. Furthermore, the use of C- or S-shaped tab connections takes up more space, reducing energy density.

[0039] Therefore, this embodiment provides a battery cell structure to solve the above problems. While ensuring that the battery cell length is long enough, it can prevent the electrode group or electrode sheet from bending and deforming, ensure the stability of quality, and reduce the space occupied by the electrode tab connection to improve energy density.

[0040] like Figures 1-9As shown, the cell structure of this embodiment includes A pole groups 1, which are arranged in sequence along their own length direction, and the end faces of any two adjacent pole groups 1 that are close to each other are provided with avoidance grooves 11, and any two adjacent avoidance grooves 11 together form an avoidance space, and the pole ears 12 of the two pole groups 1 extend from the bottom of the two avoidance grooves 11 respectively, and are electrically connected in the avoidance space, and A is a positive integer greater than or equal to 2. In this embodiment, A is 2, and in other embodiments, A can also be a positive integer of 3, 4, 5, 6, 7, 8, 9 or more. Optionally, in this embodiment, A pole groups 1 are connected in series in sequence, and the two pole ears 12 of adjacent pole groups 1 are welded together.

[0041] By increasing the number of electrode groups 1 and arranging multiple electrode groups 1 in sequence along their length, the capacity and length of a single battery cell can be increased. Furthermore, the provision of multiple electrode groups 1 prevents quality risks such as bending and deformation of the electrode group 1 or electrode sheets that can occur with a single overly long electrode group 1, thereby ensuring the stability of the battery cell quality. By creating a clearance space to accommodate the tabs 12, the additional space required for the tabs 12 can be reduced, thereby increasing energy density.

[0042] Optionally, the tabs 12 are parallel to the side surface of the largest area of ​​the electrode group 1, and two adjacent tabs 12 are directly stacked and welded, which can minimize the use of the tabs 12, reduce costs, reduce internal resistance, and save internal space of the battery cell.

[0043] In order to support and protect the connection of the tab 12, the battery cell structure optionally further includes A-1 partition support assemblies 2, which are arranged in a one-to-one correspondence in the gaps between the A electrode groups 1, that is, a partition support assembly 2 is provided between every two electrode groups 1, and the partition support assembly 2 is provided in the avoidance space between the two electrode groups 1. Each partition support assembly 2 is provided with an accommodating space, which is provided along the length direction of the electrode group 1 and is used to accommodate the tab 12.

[0044] like Figure 4-Figure 5 As shown, each partition support assembly 2 optionally includes two partition members 21, each partition member 21 having a receiving groove 2113. When the two partition members 21 are connected, the two receiving grooves 2113 are connected to form an accommodating space. Optionally, the partition members 21 are made of an insulating material to ensure insulation between the electrode groups 1.

[0045] Optionally, the avoidance groove 11 is opened through in a direction perpendicular to the side surface of the largest area of ​​the electrode group 1 , so that a partition 21 is provided to fix and limit the electrode tab 12 in the avoidance groove 11 .

[0046] Optionally, each partition member 21 includes a receiving portion 211 , which includes a bottom plate 2111 and protruding side edges 2112 arranged on both sides of the bottom plate 2111 , the bottom plate 2111 is the bottom of the receiving groove 2113 , and the protruding side edges 2112 are side walls of the receiving groove 2113 .

[0047] Optionally, the partition member 21 further includes a guide portion 212, which is a plate-shaped structure with a plate surface perpendicular to the length direction of the electrode group 1. The side of the bottom plate 2111 facing away from the electrode tab 12 is connected to the guide portion 212. Optionally, the partition member 21 further includes a reinforcement portion 213, which is used to reinforce the bottom plate 2111. The reinforcement portion 213 is arranged on the side of the bottom plate 2111 facing away from the electrode tab 12. One side of the reinforcement portion 213 is connected to the bottom plate 2111, and the other side is connected to the guide portion 212. In this embodiment, the reinforcement portion 213 and the protruding side edge 2112 are two parts of the same plate located on both sides of the bottom plate 2111, thereby simplifying the structure of the partition member 21 and facilitating processing.

[0048] Optionally, the cut surface of the partition member 21 contacting the electrode group 1 may be bonded to the electrode group 1 to prevent the partition member 21 from changing position relative to the electrode group 1 .

[0049] To further enhance the overall structural strength of the cell structure, the cell structure optionally includes a support frame 3, which surrounds the A electrode groups 1 and does not obstruct the sides of the electrode groups 1 with the largest area. Optionally, the support frame 3 is made of an insulating material to prevent internal short circuits. Optionally, the support frame 3 is an integrated structure, which reduces parts and simplifies assembly steps. Optionally, the support frame 3 is manufactured using an injection molding process.

[0050] Optionally, the support frame 3 includes two oppositely disposed side panels 31 and two oppositely disposed end panels 32. The end panels 32 are provided with escape holes 321 to allow the tabs 12 of the two pole groups 1 at both ends to pass through the escape holes 321 and connect to the pole posts 51. Optionally, the side panels 31 correspond to the middle of the pole group 1 and have a width smaller than the thickness of the pole group 1 to facilitate exhaust of the pole group 1, prevent explosions, and ensure safety.

[0051] In order to facilitate the positioning of the partition member 21 and facilitate the assembly of the partition member 21 to the support frame 3, optionally, a guide groove 311 is opened on the inner wall of the support frame 3. The guide groove 311 is opened along a first direction, which is perpendicular to the side surface of the largest area of ​​the electrode group 1. Part of the partition support assembly 2 can be movably inserted into the guide groove 311, that is, the guide portion 212 can be movably inserted into the guide groove 311. Figure 3 The ab direction in is the first direction.

[0052] Optionally, in actual assembly, one partition piece 21 may be inserted from one end of the guide groove 311 , and the other partition piece 21 may be inserted from the other end of the guide groove 311 , and the two partition pieces 21 may be relatively close to each other until they are butted against each other.

[0053] Optionally, guide grooves 311 are provided on the inner walls of the side panels 31 on both sides so that the two ends of the partition piece 21 contacting the support frame 3, i.e., both ends of the guide portion 212 are inserted into the guide grooves 311 to prevent the partition piece 21 from moving or twisting along the length direction of the pole group 1.

[0054] like Figure 6 As shown, optionally, the thickness M of the portion of the partition support assembly 2 inserted into the guide groove 311 along the third direction satisfies 0.8 mm < M < 3 mm, which is a restriction on the thickness of the guide portion 212. The third direction is the length direction of the electrode group 1. Figure 3 The ef direction in FIG. 2 is the third direction. As can be seen, if the guide portion 212 is too thin, it will affect its structural strength and easily damage under stress. Since the guide portion 212 is sandwiched between two adjacent electrode groups 1, if the guide portion 212 is too thick, it will occupy too much space, and the distance between the two electrode groups 1 will be too large, affecting the energy density of the battery cell.

[0055] like Figure 7 and Figure 8 As shown, optionally, the height H of the side wall of the guide groove 311 along the second direction satisfies 1mm<H<5mm, the second direction is perpendicular to the first direction, and the second direction is perpendicular to the length direction of the pole group 1, Figure 3 The cd direction in the figure is the second direction. If the height H of the sidewalls of the guide groove 311 along the second direction is less than 1 mm, the guide function for the partition member 21 cannot be guaranteed, and the partition member 21 may easily fall out of the guide groove 311. If the height H of the sidewalls of the guide groove 311 along the second direction is greater than 5 mm, it may easily interfere with the electrode group 1, causing pressure and damage to the electrode group 1.

[0056] Optionally, the cell structure further includes an inner insulating film 4 , which is cylindrical and sleeved on the outside of the support frame 3 and the A electrode groups 1 , and the penetration direction of the inner insulating film 4 is parallel to the length direction of the electrode group 1 .

[0057] Optionally, the cell structure also includes a cover plate 5 and a housing 6. The housing 6 is sealed to the cover plates 5 at both ends, forming a cell housing. The electrode group 1, support frame 3, and inner insulating film 4 are all disposed within the cell housing. Optionally, the boss structure on the cover plate 5 is the electrode post 51, and the integrated structure can eliminate the need for sealing components. Optionally, the cover plate 5 is provided with an explosion-proof hole 52, and an explosion-proof valve is installed at the explosion-proof hole 52 to ensure the safety of the cell. Optionally, the cover plate 5 is made of plain aluminum to ensure structural strength.

[0058] This battery cell structure can reduce the length of a single pole group 1 while meeting the overall length, thus avoiding defects such as wrinkles, deformation, layer crossover, and breakage caused by the long pole piece length. The pole ears 12 of multiple pole groups 1 of this battery cell structure are directly connected, and no additional connectors are required, which can achieve cost reduction and reduce internal resistance. In addition, the airway gap is unobstructed, which can increase the exhaust efficiency, shorten the airway stroke, and thus improve the safety of the battery cell. A partition piece 21 is set at the welding position of the pole ear 12, and is guided and matched with the side plate 31 of the support frame 3 for easy assembly. After the two partition pieces 21 are docked, an accommodating space is formed. The pole ear 12 is set in the accommodating space, which can effectively prevent the pole ear 12 from being crushed and other defects.

[0059] This embodiment also provides a battery comprising a battery housing and the aforementioned cell structure, wherein the cell structure is disposed within the battery housing. The cell structure of the battery has a long length and prevents bending and deformation of the electrode group 1 or the electrode sheet, thereby ensuring quality stability. It also reduces the space occupied by the connection of the electrode tab 12 and improves energy density.

[0060] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. The battery cell structure is characterized by: include: A pole groups (1), the pole groups (1) are arranged in sequence along their own length direction, and any two adjacent pole groups (1) are provided with avoidance grooves (11) on their adjacent end faces, and any two adjacent avoidance grooves (11) jointly form an avoidance space, and the pole ears (12) of the two pole groups (1) respectively extend from the groove bottoms of the two avoidance grooves (11) and are electrically connected in the avoidance space, and A is a positive integer greater than or equal to 2.

2. The battery cell structure according to claim 1, characterized in that: It also includes A-1 partition support assemblies (2), wherein the A-1 partition support assemblies (2) are arranged one by one in the gaps between the A pole groups (1), and each of the partition support assemblies (2) is provided with an accommodation space, which is provided through the length direction of the pole group (1), and is used to accommodate the pole lug (12).

3. The battery core structure according to claim 2, characterized in that: Each partition support assembly (2) comprises two partition members (21), each partition member (21) is provided with an accommodating groove (2113), and when the two partition members (21) are butted together, the two accommodating grooves (2113) are butted together to form the accommodating space.

4. The battery core structure according to claim 3, characterized in that: Each partition member (21) comprises a receiving portion (211), wherein the receiving portion (211) comprises a bottom plate (2111) and protruding side edges (2112) arranged on both sides of the bottom plate (2111), wherein the bottom plate (2111) is the bottom of the receiving groove (2113), and the protruding side edges (2112) are the side walls of the receiving groove (2113).

5. The battery core structure according to any one of claims 2 to 4, characterized in that: It also includes a support frame (3), which is arranged around the outside of the A pole groups (1), and the support frame (3) does not block the side surface of the pole group (1) with the largest area.

6. The battery core structure according to claim 5, characterized in that: A guide groove (311) is provided on the inner wall of the support frame (3), and the guide groove (311) is opened through along a first direction, the first direction being perpendicular to the side surface of the largest area of ​​the pole group (1), and the partition support assembly (2) is partially movably inserted into the guide groove (311).

7. The battery core structure according to claim 6, characterized in that: The height H of the side wall of the guide groove (311) along the second direction satisfies 1mm<H<5mm, the second direction is perpendicular to the first direction, and the second direction is perpendicular to the length direction of the pole group (1).

8. The battery core structure according to claim 6, characterized in that: The thickness M of the portion of the partition support assembly (2) inserted into the guide groove (311) along the third direction satisfies 0.8 mm < M < 3 mm, and the third direction is the length direction of the pole group (1).

9. The battery core structure according to claim 5, characterized in that: It also includes an inner insulating film (4), which is cylindrical and sleeved on the outside of the support frame (3) and the A pole groups (1), and the through direction of the inner insulating film (4) is parallel to the length direction of the pole group (1).

10. A battery, characterized in that The invention comprises a battery casing and a battery core structure according to any one of claims 1 to 9, wherein the battery core structure is arranged in the battery casing.

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