Long battery cell with split structure

Abstract

The utility model belongs to the technical field of battery cell structures, and discloses a long battery cell with a split structure. The long battery cell of the split structure comprises at least two pole groups and a rectangular frame, every two adjacent pole groups are electrically connected through a pole lug, at least two containing spaces are formed in the rectangular frame, one corresponding pole group is contained in each containing space in a limited mode, a partition piece is formed between every two adjacent containing spaces, and the partition pieces are arranged in the containing spaces. The partition piece is provided with a first through groove for the pole lug to penetrate through. Through the rectangular frame, a plurality of short pole groups can be combined to form a long battery cell with a split structure, so that the capacity of a single battery cell is greatly increased. Meanwhile, due to the arrangement of the multiple pole groups, the phenomena of wrinkles, bending deformation, layer channeling, breakage and the like caused by the fact that the pole groups are long are avoided, and the yield is guaranteed. Moreover, the pole groups are electrically connected directly through the tabs, so that the number of parts and the structural cost are reduced, the space waste is avoided, and the compact design of the battery pack is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of battery cell structures, in particular to a split-structured long battery cell. Background Art

[0002] The existing battery cell structures are generally short, and the overall capacity is limited by process conditions, making it difficult to meet the demand for changing energy density. Although simply increasing the length of the battery cell can theoretically increase the overall capacity, due to the strength limitation of the electrode group itself and the forming process limitation of the increase in the length of the battery cell, it will instead reduce the production yield due to phenomena such as wrinkles, bending deformation, layer displacement, and fracture. At the same time, the series connection between multiple battery cells will increase the structural cost and may cause space waste, which is not conducive to the compact design of the battery pack.

[0003] Based on the above, there is an urgent need for a split-structured long battery cell to solve the above technical problems. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a split-structured long battery cell, which can have a large capacity and has better product yield and cost.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] The split-structured long battery cell includes:

[0007] At least two electrode groups, at least two of the electrode groups are arranged in the length direction, and an electrical connection is formed between adjacent two of the electrode groups through electrode tabs;

[0008] A rectangular frame, at least two accommodating spaces are arranged inside the rectangular frame, each of the accommodating spaces limits and accommodates a corresponding one of the electrode groups, a partition is formed between adjacent two of the accommodating spaces, the partition is provided with a first through groove for the electrode tab to pass through, and the partition can limit and abut against the adjacent electrode group.

[0009] Preferably, the rectangular frame includes two side plates and two support plates, the two side plates are arranged parallel to the length direction of the electrode group and are arranged at intervals along the width direction of the electrode group, the two support plates are arranged parallel to the width direction of the electrode group and are arranged at intervals along the length direction of the electrode group, and each end of the side plate is connected to one of the support plates.

[0010] Preferably, one of the support plates and the two side plates are integrally formed, and the other support plate is detachably connected to the two side plates; or,

[0011] Each of the support plates is detachably connected to the two side plates.

[0012] Preferably, the side plates include a plurality of connecting portions and a plurality of limiting portions alternately connected along the length direction of the electrode group, and in the thickness direction of the electrode group, the width of the connecting portion is smaller than that of the limiting portion.

[0013] Preferably, each side plate is connected with a partition portion, the partition portion extends along the width direction of the electrode group, the two partition portions are arranged facing each other, and the two partition portions can be coupled to form the partition member.

[0014] Preferably, the split-structured long battery cell further includes a positive electrode cover plate and a negative electrode cover plate. Along the length direction of the electrode group, the positive electrode cover plate is arranged at one end of the split-structured long battery cell, and the negative electrode cover plate is arranged at the other end of the split-structured long battery cell.

[0015] The support plate is further provided with a second through groove, and the tab can pass through the second through groove and respectively form electrical connections with the positive electrode cover plate and the negative electrode cover plate.

[0016] Preferably, the rectangular frame is made of an insulating material, the positive electrode cover plate is made of an aluminum structure, and is insulated from the negative electrode cover plate through the rectangular frame.

[0017] Preferably, the split-structured long battery cell further includes an insulating film and a battery cell housing. The insulating film is wrapped around the rectangular frame, and the insulating film and the electrode group are both accommodated in the battery cell housing. The positive electrode cover plate and the negative electrode cover plate are fixedly connected to the battery cell housing.

[0018] Preferably, the battery cell housing is provided with at least two explosion-proof members, each explosion-proof member corresponds to one of the accommodation spaces, and the insulating film is provided with at least one slit structure, and each slit structure is correspondingly arranged between the explosion-proof member and the accommodation space.

[0019] Preferably, the explosion-proof members are all arranged on the battery cell housing.

[0020] Advantages of the present utility model: Through the rectangular frame, a plurality of shorter electrode groups can be combined to form a split-structured long battery cell, thereby greatly increasing the capacity of a single battery cell. At the same time, the setting of a plurality of shorter electrode groups avoids phenomena such as wrinkles, bending deformation, layer displacement, and fracture caused by the long electrode group, ensuring the yield rate of the electrode group and the split-structured long battery cell. Moreover, the adjacent electrode groups are directly electrically connected through the tabs corresponding to each other. Compared with connecting a plurality of battery cells, the number of parts and the structural cost are reduced, and space waste is also avoided, which is beneficial to the compact design of the battery pack. Description of the Drawings

[0021] Figure 1 It is an assembly schematic diagram of the split-structured long battery cell provided by the present utility model;

[0022] Figure 2 It is an assembly schematic diagram of the electrode group, rectangular frame, positive electrode cover plate and negative electrode cover plate in the present utility model;

[0023] Figure 3 It is a three-dimensional structure diagram when the side plate and the support plate in the present utility model are integrally formed;

[0024] Figure 4 It is a three-dimensional structure diagram of the support plate in the present utility model;

[0025] Figure 5 It is a side view when the side plate and the support plate in the present utility model are integrally formed;

[0026] Figure 6 It is a top view when the side plate and the support plate in the present utility model are integrally formed;

[0027] Figure 7 It is along Figure 6 the sectional view taken along A-A in

[0028] Figure 8 It is a three-dimensional diagram of the positive electrode cover plate in the present utility model;

[0029] Figure 9 It is a side view of the battery cell housing in the present utility model;

[0030] Figure 10 It is along Figure 9 the sectional view taken along B-B in

[0031] Figure 11 It is a side view of the insulating film in the present utility model;

[0032] Figure 12 It is Figure 11 the partial enlarged view at C in

[0033] In the figure:

[0034] 1. Electrode group;

[0035] 2. Rectangular frame; 21. Side plate; 211. Connection part; 212. Limiting part; 22. Support plate; 221. Second through groove; 23. Partition member; 231. Partition part; 232. First through groove;

[0036] 3. Positive electrode cover plate;

[0037] 4. Negative electrode cover plate;

[0038] 5. Insulating film; 51. Slit structure;

[0039] 6. Battery cell housing;

[0040] 7. Explosion-proof component. Specific embodiments

[0041] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only the parts related to the present utility model are shown in the drawings, rather than all the structures.

[0042] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0043] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is at a higher horizontal height than the second feature. The first feature being "below", "below", and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is at a lower horizontal height than the second feature.

[0044] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0045] The following is based on the attached Figure 1 to the attached Figure 12 to introduce the split-structured long battery cell provided by the present utility model.

[0046] Such as Figure 1 、 Figure 2As shown, the split-structured long battery cell includes a pole group 1 and a rectangular frame 2, and the two pole groups 1 are arranged along their length directions. Both of the two pole groups 1 are provided with pole tabs, and the pole tabs of the positive and negative electrodes can be horizontally welded and connected correspondingly, so as to achieve series connection and play a role in saving the length of the pole tabs.

[0047] A partition member 23 is arranged inside the rectangular frame 2, and two accommodating spaces are formed by partitioning through the partition member 23. The two pole groups 1 are correspondingly arranged in the two accommodating spaces and are fixed and limited by the inner walls of the accommodating spaces. The partition member 23 can not only play a role in limiting and fixing the pole group 1, but also, the partition member 23 is provided with a first through groove 232, and the pole tabs of the above-mentioned pole group 1 can pass through the first through groove 232, so that the two pole groups 1 can be directly electrically connected inside the rectangular frame 2 and play a protective role for the connection part of the pole tabs.

[0048] Through the rectangular frame 2, multiple shorter pole groups 1 can be combined to form a split-structured long battery cell, thereby greatly increasing the capacity of a single battery cell. At the same time, the setting of multiple shorter pole groups 1 avoids phenomena such as wrinkles, bending deformation, layer shifting, and fracture caused by the long pole group 1, and ensures the yield rate of the pole group 1 and the split-structured long battery cell. Moreover, the adjacent pole groups 1 are directly electrically connected through the pole tabs correspondingly. Compared with connecting multiple battery cells, the number of parts and the structural cost are reduced, and space waste is also avoided, which is beneficial to the compact design of the battery pack.

[0049] Of course, in some other embodiments, more pole groups 1 can also be adopted. Exemplarily, by arranging more partition members 23 inside the rectangular frame 2, more accommodating spaces can be formed, so as to correspondingly accommodate a larger number of pole groups 1.

[0050] As Figure 1 、 2 shown, in this embodiment, the split-structured long battery cell further includes a battery cell housing 6, an insulating film 5, a positive electrode cover plate 3, and a negative electrode cover plate 4. The thickness of the insulating film 5 is 0.1 mm - 0.3 mm, and it is wrapped around the rectangular frame 2. The insulating film 5 and the pole group 1 are both accommodated in the battery cell housing 6, so as to insulate the pole group 1 from the battery cell housing 6. The positive electrode cover plate 3 and the negative electrode cover plate 4 are fixedly connected to the battery cell housing 6. Along the length direction of the pole group 1, the positive electrode cover plate 3 is arranged at one end of the split-structured long battery cell, and the negative electrode cover plate 4 is arranged at the other end of the split-structured long battery cell. The positive electrode cover plate 3 is connected to the positive electrode pole tab of the pole group 1 located at the end of the split-structured long battery cell, and the negative electrode cover plate 4 is connected to the negative electrode pole tab of the pole group 1 located at the end of the split-structured long battery cell. The support plate 22 is provided with a second through groove 221, and the pole tabs can pass through the second through groove 221 and are respectively electrically connected to the positive electrode cover plate 3 and the negative electrode cover plate 4.

[0051] As Figures 2 to 4As shown, in this embodiment, the rectangular frame 2 includes two side plates 21 and two support plates 22. The two side plates 21 are arranged parallel to the length direction of the electrode group 1 and are spaced apart along the width direction of the electrode group 1. The two support plates 22 are arranged parallel to the width direction of the electrode group 1 and are spaced apart along the length direction of the electrode group 1. One support plate 22 is connected to each end of the side plate 21, and the two side plates 21 and the two support plates 22 together form the above-mentioned rectangular frame 2. Optionally, through holes are also provided on the side plate 21 to facilitate installation and fixation.

[0052] Preferably, as Figure 3 , Figure 4 shown, in this embodiment, one of the support plates 22 and the two side plates 21 are integrally formed, and the other support plate 22 and the two side plates 21 are separately connected by means such as gluing and heat melting. This setting method can strengthen the structural strength of the rectangular frame 2. In particular, the integrally formed support plate 22 and side plate 21 can play a good protective role for the electrode group 1 when moving or pushing the electrode group 1 and the rectangular frame 2 (for example, when loading the electrode group 1 and the rectangular frame 2 into the housing).

[0053] Of course, in some other embodiments, both support plates 22 can also be separately connected to the side plate 21, so as to facilitate loading the electrode group 1 into the accommodation space, which also falls within the scope of protection of the present utility model.

[0054] More specifically, as Figure 5 shown, the side plate 21 includes a plurality of connecting portions 211 and a plurality of limiting portions 212 that are alternately connected along the length direction of the electrode group 1. And along the thickness direction of the electrode group 1, the width h2 of the connecting portion 211 is smaller than the width h1 of the limiting portion 212. In this side plate 21, the width h1 of the limiting portion 212 is larger, which can better limit the electrode group 1 and ensure the fixation of the electrode group 1 and the structural strength of the entire split-structured long battery cell. The width h2 of the connecting portion 211 is smaller, which can not only facilitate the exhaust when the electrode group 1 is abnormal, but also reduce the weight of the entire split-structured long battery cell, thereby improving its energy density. Preferably, in this embodiment, the width h2 of the connecting portion 211 is not less than 1 mm, and the width h1 of the limiting portion 212 is not greater than 5 mm.

[0055] As Figure 6 , Figure 7As shown, a partition portion 231 is connected to each side plate 21. The partition portion 231 extends along the width direction of the electrode group 1. The two partition portions 231 face each other, and the two partition portions 231 can be coupled to form a partition member 23 for the tab to pass through and protect the tab. Specifically, in this embodiment, the partition portion 231, the connecting portion 211, the limiting portion 212, and one of the above-mentioned support plates 22 are integrally injection-molded. By controlling the size of the partition portion 231, an assembly allowance t is reserved between the two partition portions 231. This assembly allowance t can prevent the side plate 21 from bending and deforming due to the production size error of the partition portion 231. Preferably, the size of the assembly allowance t is 0.3 mm - 2 mm.

[0056] Preferably, in this embodiment, the rectangular frame 2 is made of an insulating material, so that the positive electrode cover plate 3 can be insulated from the negative electrode cover plate 4 through the rectangular frame 2. At this time, the positive electrode cover plate 3 can be directly made of an aluminum structure. Exemplarily, as Figure 8 shown, the positive electrode cover plate 3 is made of a polished aluminum plate, and a boss structure is provided to form a pole column, so as to be integrally formed, canceling structures such as an insulating member and a pole column, and greatly increasing the space utilization rate inside the long split-structured battery cell.

[0057] As Figures 9 to 12 shown, in this embodiment, the battery cell housing 6 is provided with at least two explosion-proof members 7. Each explosion-proof member 7 corresponds to a receiving space, and the insulating film 5 is provided with at least one slit structure 51. Each slit structure 51 is correspondingly arranged between the explosion-proof member 7 and the receiving space. Exemplarily, a pressure relief port is provided on the side surface of the battery cell housing 6, and the explosion-proof member 7 is an explosion-proof valve. The explosion-proof valve is arranged at the 1 / 4 position of the battery cell housing 6 along the length direction of the electrode group 1. When the electrode group 1 gets out of control, the gas can first break through the slit structure 51, and then pass through the explosion-proof member 7, and finally flow from the inside of the long split-structured battery cell to the external environment along a shorter path, avoiding the continuous increase of the pressure inside the long split-structured battery cell and causing dangerous phenomena such as explosion.

[0058] It should be noted that, in this embodiment, the explosion-proof members 7 are all arranged on the battery housing, and the above-mentioned positive electrode cover plate 3 and negative electrode cover plate 4 are not provided with explosion-proof members 7, so as to adapt to the structural characteristics of the long split-structured battery cell, shorten the path of the gas flow, increase the exhaust efficiency, and further improve the safety of the long split-structured battery cell.

[0059] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. Split-structured long battery cell, characterized in that, Comprising: At least two electrode groups (1), at least two of the electrode groups (1) are arranged along the length direction, and adjacent two of the electrode groups (1) are electrically connected through electrode tabs; A rectangular frame (2), at least two accommodating spaces are arranged inside the rectangular frame (2), each accommodating space limits and accommodates a corresponding one of the electrode groups (1), a partition member (23) is formed between adjacent two of the accommodating spaces, the partition member (23) is provided with a first through slot (232) for the electrode tab to pass through, and the partition member (23) can limit and abut against the adjacent electrode groups (1).

2. The split-structured long battery cell according to claim 1, characterized in that The rectangular frame (2) includes two side plates (21) and two support plates (22), the two side plates (21) are arranged parallel to the length direction of the electrode group (1), and are arranged at intervals along the width direction of the electrode group (1), the two support plates (22) are arranged parallel to the width direction of the electrode group (1), and are arranged at intervals along the length direction of the electrode group (1), and each end of the side plate (21) is connected to one of the support plates (22).

3. The split-structured long battery cell according to claim 2, characterized in that One of the support plates (22) and the two side plates (21) are integrally formed, and the other support plate (22) is separately connected to the two side plates (21); or Each support plate (22) is separately connected to the two side plates (21).

4. The split-structured long battery cell according to claim 3, characterized in that The side plate (21) includes a plurality of connecting portions (211) and a plurality of limiting portions (212) that are alternately connected along the length direction of the electrode group (1), and along the thickness direction of the electrode group (1), the width of the connecting portion (211) is smaller than the width of the limiting portion (212).

5. The split-structured long battery cell according to claim 2, characterized in that Each side plate (21) is connected with a partition portion (231), the partition portion (231) extends along the width direction of the electrode group (1), the two partition portions (231) face each other, and the two partition portions (231) can be coupled to form the partition member (23).

6. The split-structured long battery cell according to claim 2, characterized in that The split-structured long battery cell further includes a positive electrode cover plate (3) and a negative electrode cover plate (4), along the length direction of the electrode group (1), the positive electrode cover plate (3) is arranged at one end of the split-structured long battery cell, and the negative electrode cover plate (4) is arranged at the other end of the split-structured long battery cell, The support plate (22) is further provided with a second through slot (221), and the electrode tab can pass through the second through slot (221) and respectively form electrical connections with the positive electrode cover plate (3) and the negative electrode cover plate (4).

7. The split-structured long battery cell according to claim 6, characterized in that The rectangular frame (2) is made of an insulating material. The positive electrode cover plate (3) is made of an aluminum structure and is insulated from the negative electrode cover plate (4) through the rectangular frame (2).

8. The split-structured long battery cell according to claim 6, wherein the split-structured long battery cell further includes an insulating film (5) and a battery cell housing (6). The insulating film (5) is wrapped around the rectangular frame (2), and both the insulating film (5) and the electrode group (1) are accommodated in the battery cell housing (6). The positive electrode cover plate (3) and the negative electrode cover plate (4) are fixedly connected to the battery cell housing (6).

9. The split-structured long battery cell according to claim 8, wherein the battery cell housing (6) is provided with at least two explosion-proof parts (7). Each explosion-proof part (7) corresponds to one of the accommodation spaces, and the insulating film (5) is provided with at least one slit structure (51). Each slit structure (51) is correspondingly arranged between the explosion-proof part (7) and the accommodation space.

10. The split-structured long battery cell according to claim 9, wherein the explosion-proof parts (7) are all arranged on the battery cell housing (6).

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