Frame structure and battery cell

Abstract

The utility model belongs to the technical field of battery cell structures, and discloses a frame structure and a battery cell. The frame structure comprises a side plate, a first adjusting piece and a second adjusting piece, the first adjusting piece is fixedly connected to the side plate, the second adjusting piece and the first adjusting piece are connected in the direction away from the side plate in a position-adjustable mode, and at least two containing spaces are defined by the frame structure. The first adjusting piece and the second adjusting piece are located between the two adjacent containing spaces, and each containing space can contain one pole group in a limiting mode. The first adjusting piece is provided with a first through groove, and the tabs of the pole groups can penetrate through the first through groove, so that the adjacent pole groups are electrically connected through the tabs. Through the frame structure, a plurality of pole groups can be combined to form a battery cell, so that the capacity of a single battery cell is greatly increased, and the frame structure has a compatible effect on pole groups with different widths. Due to the arrangement of the multiple pole groups, the abnormal phenomenon caused by the long single pole group is avoided, and the yield of the pole groups and the battery cells is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of cell structures, in particular to a frame structure and a cell. Background Art

[0002] The existing cell structures are generally short, and the overall capacity is limited by process conditions, making it difficult to meet the requirements for changing the energy density. Although simply increasing the length of the cell can theoretically increase the overall capacity, due to the strength limitation of the electrode group itself and the forming process limitation after the cell grows, 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 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 frame structure and a cell to solve the above technical problems. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a frame structure and a cell, which can enable the cell to have a higher capacity, and have better product yield and production cost.

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

[0006] A frame structure is arranged inside the cell. The frame structure includes side plates, a first adjusting member, and a second adjusting member. Among them,

[0007] The first adjusting member is fixedly connected to the side plate, and in the direction away from the side plate, the second adjusting member and the first adjusting member are connected and arranged in a position-adjustable manner. The frame structure defines at least two accommodating spaces. The first adjusting member and the second adjusting member are located between two adjacent accommodating spaces. Each accommodating space can limit and accommodate an electrode group.

[0008] The first adjusting member is provided with a first through groove, and the tab of the electrode group can pass through the first through groove, so that adjacent electrode groups are electrically connected through the tab.

[0009] The second adjusting member is provided with two abutting portions, and the abutting portions can cooperate with the side plate to clamp and limit the electrode group.

[0010] Preferably, one end of the first adjusting member is connected to the side plate, and the other end of the first adjusting member is provided with a mounting hole, and the second adjusting member is slidably inserted into the mounting hole.

[0011] Preferably, the frame structure further includes a support plate fixedly connected to the end of the side plate, and the support plate is provided with a second through groove through which the tab can pass.

[0012] Preferably, both the first adjusting member and the second adjusting member are hollow members, and the first adjusting member and the second adjusting member can communicate to form an exhaust passage. The side plate or the first adjusting member is provided with a first air hole, the second adjusting member is provided with a second air hole, and the exhaust passage is communicated with the first air hole, the first through groove, and the second air hole. The first air hole and the second air hole are used for exhausting gas.

[0013] Preferably, the battery cell further includes an insulating film and a battery cell housing. The insulating film is wrapped around the frame structure and the electrode group, and the insulating film is disposed between the battery cell housing and the frame structure.

[0014] The insulating film is provided with clearance holes, and the clearance holes, the first air hole, and the second air hole are coaxially communicated. Gas can be discharged outside the insulating film through the clearance holes.

[0015] Preferably, the battery cell housing is provided with an exhaust hole, and an explosion-proof valve is installed in the exhaust hole. The exhaust hole is coaxially communicated with the clearance hole.

[0016] Preferably, a rib is provided at one end of the second adjusting member away from the first adjusting member, and the rib is used to prevent the explosion-proof valve from being damaged during the assembly process.

[0017] Preferably, the insulating film is further provided with at least two slit structures, each slit structure corresponding to one of the accommodating spaces. The battery cell housing is provided with at least two explosion-proof valves, each explosion-proof valve corresponding to one of the accommodating spaces. Each slit structure is disposed between the explosion-proof valve and the accommodating space.

[0018] Preferably, the battery cell housing is further connected with a positive electrode cover plate and a negative electrode cover plate. The positive electrode cover plate and the negative electrode cover plate are fixedly connected to the battery cell housing and are respectively connected to the tabs correspondingly.

[0019] The positive electrode cover plate is made of an aluminum structure. The battery cell further includes an insulating member, and the insulating member is clamped between the positive electrode cover plate and the electrode group.

[0020] A battery cell, including the above-mentioned frame structure.

[0021] Advantages of the present utility model: Through this frame structure, multiple shorter electrode groups can be combined to form a battery cell, thereby greatly increasing the capacity of a single battery cell and having a compatible effect on electrode groups of different widths. At the same time, the setting of multiple 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 battery cell. Moreover, the adjacent electrode groups are directly electrically connected through the corresponding electrode tabs. Compared with connecting multiple battery cells, it reduces the number of parts and structural costs, and also avoids space waste, which is beneficial to the compact design of the battery pack. Description of the Drawings

[0022] Figure 1 is the first assembly schematic diagram of the battery cell provided by the present utility model;

[0023] Figure 2 is the second assembly schematic diagram of the battery cell provided by the present utility model;

[0024] Figure 3 is the assembly drawing of the frame structure in the present utility model;

[0025] Figure 4 is the three-dimensional structure diagram of the side plate and the first adjusting member in the present utility model;

[0026] Figure 5 is the three-dimensional structure diagram of the second adjusting member in the present utility model;

[0027] Figure 6 is the bottom view of the second adjusting member in the present utility model;

[0028] Figure 7 is the side view of the second adjusting member in the present utility model;

[0029] Figure 8 is the first perspective assembly drawing of the frame structure and the electrode group in the present utility model;

[0030] Figure 9 is the second perspective assembly drawing of the frame structure and the electrode group in the present utility model;

[0031] Figure 10 is the three-dimensional structure diagram of the support plate in the present utility model;

[0032] Figure 11 is the front view of the support plate in the present utility model;

[0033] Figure 12 is the three-dimensional structure diagram of the battery cell in the present utility model;

[0034] Figure 13 is the top view of the insulating film in the present utility model;

[0035] Figure 14It is the bottom view of the battery cell in the present utility model;

[0036] Figure 15 It is the bottom view of the insulating film in the present utility model;

[0037] Figure 16 It is along Figure 14 The internal structure diagram in the A-A direction in

[0038] Figure 17 It is Figure 16 The partial enlarged view at position B in

[0039] Figure 18 It is the assembly schematic diagram of the positive electrode cover plate and the insulating sticker in the present utility model.

[0040] In the figure:

[0041] 1. Pole group;

[0042] 21. Side plate; 211. First air hole; 22. Support plate; 221. Second through groove; 23. First adjusting part; 231. First through groove; 232. Mounting hole; 24. Second adjusting part; 241. Abutting part; 242. Second air hole; 243. Rib;

[0043] 31. Positive electrode cover plate; 32. Insulating sticker; 33. Negative electrode cover plate;

[0044] 4. Insulating film; 41. Clearance hole; 42. Cutting groove structure;

[0045] 5. Battery cell housing;

[0046] 6. Explosion-proof valve. Specific embodiments

[0047] The present utility model will be further described in detail below with reference to the 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 parts related to the present utility model rather than all structures are shown in the drawings.

[0048] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. 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.

[0049] In the present utility model, unless otherwise clearly specified and defined, 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 therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under" and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0050] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "right", etc. are based on the orientation or positional relationship shown in the drawings. It is 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. Therefore, it should not be construed 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 meaning.

[0051] The following will introduce the frame structure and the battery cell provided by the present utility model according to the attached Figure 1 to the attached Figure 18 drawings.

[0052] As Figure 1 , Figure 2 shown, the frame structure is mainly used to fix the pole group 1 and assemble to form a battery cell. Specifically, in this embodiment, the frame structure includes a side plate 21, a first adjusting member 23 and a second adjusting member 24. Among them, the first adjusting member 23 is fixedly connected to the side plate 21, and in the direction away from the side plate 21, the second adjusting member 24 and the first adjusting member 23 are connected in a position-adjustable manner. The frame structure forms two accommodating spaces. The first adjusting member 23 and the second adjusting member 24 are located between the two accommodating spaces, and each accommodating space can limit and accommodate a pole group 1. Moreover, the first adjusting member 23 is provided with a first through groove 231, and the pole ear of the pole group 1 can pass through the first through groove 231. The pole ears of two adjacent pole groups 1 are welded and connected and pass through the first through groove 231, so that the adjacent pole groups 1 can be directly electrically connected through the pole ears within the frame structure. The second adjusting member 24 is provided with two abutting portions 241, and the abutting portions 241 can cooperate with the side plate 21 to clamp and limit the pole group 1, so that the pole group 1 is limited and arranged within the accommodating space.

[0053] When assembling to form a battery cell, according to the width of the pole group 1, the connection position of the second adjusting member 24 and the first adjusting member 23 can be adaptively adjusted, so as to meet the fixing requirements of pole groups 1 with different widths, and make the two sides of the pole group 1 be respectively limited and abutted by the side plate 21 and the abutting portions 241, thereby fixing the pole group 1.

[0054] Through this frame structure, multiple shorter electrode groups 1 can be combined to form an electric core, thereby greatly increasing the capacity of a single electric core and having a compatible effect on electrode groups 1 with different widths. At the same time, the setting of multiple shorter electrode groups 1 avoids phenomena such as wrinkles, bending deformation, layer displacement, and fracture caused by the long length of the electrode group 1, ensuring the good product rate of the electrode group 1 and the electric core. Moreover, the adjacent electrode groups 1 are directly electrically connected through the corresponding electrode tabs. Compared with connecting multiple electric cores, 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.

[0055] Of course, in some other embodiments, more electrode groups 1 can also be adopted. Exemplarily, by arranging more first adjusting members 23 and second adjusting members 24 within the frame structure, more accommodation spaces can be formed, so as to correspondingly accommodate a larger number of electrode groups 1.

[0056] As Figure 1 、 2 shown, in this embodiment, the electric core further includes an electric core housing 5, an insulating film 4, a positive electrode cover plate 31, and a negative electrode cover plate 33. The thickness of the insulating film 4 is 0.1 mm - 0.3 mm, which is wrapped around the frame structure, and both the insulating film 4 and the electrode group 1 are accommodated within the electric core housing 5, thereby insulating the outer package (such as an aluminum-plastic film) of the electrode group 1 from the electric core housing 5. The positive electrode cover plate 31 and the negative electrode cover plate 33 are fixedly connected to the electric core housing 5. Along the length direction of the electrode group 1, the positive electrode cover plate 31 is arranged at one end of the electric core, and the negative electrode cover plate 33 is arranged at the other end of the electric core. The positive electrode cover plate 31 is connected to the positive electrode tab of the electrode group 1 located at the end of the electric core, and the negative electrode cover plate 33 is connected to the negative electrode tab of the electrode group 1 located at the end of the electric core.

[0057] As Figures 3 to 7 shown, in this embodiment, the side plate 21 and the first adjusting member 23 are integrally formed. One end of the first adjusting member 23 is connected to the side plate 21, and the other end of the first adjusting member 23 is provided with a mounting hole 232, and the other end of the second adjusting member 24 is slidably inserted into the mounting hole 232. As Figure 8 、 Figure 9 shown, by sliding the second adjusting member 24 to change the depth of insertion of the second adjusting member 24 into the mounting hole 232, the connection position between the second adjusting member 24 and the first adjusting member 23 can be changed, so that the frame structure can be compatible with the fixing requirements of electrode groups 1 with different widths. Optionally, in this embodiment, the length H of the second adjusting member 24 is 15 - 50 mm, so as to facilitate the limiting and abutting of the electrode group 1 and form a gap with a suitable size between the two accommodation spaces, which is convenient for threading and welding the electrode tabs.

[0058] Preferably, as Figures 8 to 9As shown, the frame structure further includes a support plate 22, and the support plate 22 is fixedly connected to the end of the side plate 21 close to the negative electrode cover plate 33. The support plate 22 can play a good protective role for the electrode group 1 when moving or pushing the electrode group 1 and the frame structure (for example, when loading the electrode group 1 and the rectangular frame 2 into the housing), and also facilitates the operation of the assembly personnel. As Figure 10 、 Figure 11 As shown, the support plate 22 is provided with a second through groove 221, and the tab can pass through the second through groove 221, so as to facilitate the electrical connection between the tab and the negative electrode cover plate 33.

[0059] Of course, in some other embodiments, the above-mentioned support plate 22 can also be provided at the end of the side plate 21 close to the positive electrode cover plate 31, which also belongs to the scope of protection of the present invention.

[0060] Continue to refer to Figure 8 、 Figure 9 As shown, in this embodiment, both the first adjusting member 23 and the second adjusting member 24 are hollow members, and the first adjusting member 23 and the second adjusting member 24 can communicate to form an exhaust passage. The side plate 21 is provided with a first air hole 211, and the second adjusting member 24 is provided with a second air hole 242. The exhaust passage is communicated with the first air hole 211, the first through groove 231 and the second air hole 242. When thermal runaway occurs in the electrode group 1, the generated gas can pass through the exhaust passage and be discharged from the first air hole 211 and the second air hole 242 along the shortest path, improving the exhaust efficiency.

[0061] Of course, in some other embodiments, depending on the specific structures of the side plate 21 and the first adjusting member 23, the first air hole 211 can also be provided on the first adjusting member 23. The present invention does not make specific limitations in this regard, as long as the first air hole 211 and the second air hole 242 can achieve the effect of exhausting gas.

[0062] As Figure 12 、 Figure 13 As shown, in this embodiment, an exhaust hole is provided in the middle of one side of the battery cell housing 5, and an avoidance hole 41 is provided in the middle of one side of the insulating film 4. The exhaust hole, the avoidance hole 41, the first air hole 211 and the second air hole 242 are coaxially communicated. The gas can be discharged outside the insulating film 4 through the avoidance hole 41. And, an explosion-proof valve 6 is further provided at the exhaust port. After the explosion-proof valve 6 ruptures, the gas can further flow out of the battery cell through the exhaust hole. By coaxially connecting the exhaust hole, the avoidance hole 41, the first air hole 211 and the second air hole 242, the path of gas discharge can be further shortened, the exhaust efficiency can be further increased, and risks such as explosion can be avoided.

[0063] Optionally, as Figure 14 、 Figure 15As shown, two slit structures are provided on the other side of the insulating film 4, and each slit structure corresponds to a receiving space. Two explosion-proof valves 6 are provided on the other side of the battery cell housing 5, and each explosion-proof valve 6 corresponds to a receiving space. Each slit structure is correspondingly arranged between the explosion-proof valve 6 and the receiving space. When the electrode assembly 1 gets out of control, the gas can first break through the slit structure and then pass through the explosion-proof valve 6, so as to flow from the inside of the battery cell to the external environment along a shorter path, avoiding continuous increase of the pressure inside the battery cell and resulting in dangerous phenomena such as explosion. Preferably, the exhaust area of the explosion-proof valve 6 provided in the middle of the battery cell housing 5 is not less than 0.6 times the sum of the areas of the two explosion-proof valves 6 provided on the same side, so as to achieve more efficient exhaust.

[0064] As Figure 16 , Figure 17 shown, in this embodiment, a rib 243 is provided at one end of the second adjusting member 24 away from the first adjusting member 23, and along the direction from the center of the rib 243 to the edge, the height of the rib 243 protruding from the second adjusting member 24 gradually decreases, so as to avoid the explosion-proof valve 6 being impacted and damaged during the assembly process. Preferably, ribs 243 are provided on both sides of the second air hole 242, and the distance L between the ribs 243 is at least 1 mm larger than the width W of the explosion-proof valve 6, so that during the assembly process, the explosion-proof valve 6 does not contact the second adjusting member 24, avoiding the explosion-proof valve 6 being impacted and damaged.

[0065] As Figure 18 shown, optionally, the positive electrode cover plate 31 is made of an aluminum structure, and the battery cell further includes an insulating member, and the insulating member is clamped between the positive electrode cover plate 31 and the electrode assembly 1, so as to avoid the battery cell from short-circuiting. Specifically, in this embodiment, the insulating member is an insulating sticker 32.

[0066] The present utility model further provides a battery cell, including the above-mentioned frame structure. Through this frame structure, a plurality of shorter electrode assemblies 1 can be combined to form a battery cell, so that the capacity of a single battery cell is greatly increased, and it has a compatibility effect on electrode assemblies 1 with different widths. At the same time, the arrangement of a plurality of shorter electrode assemblies 1 avoids phenomena such as wrinkles, bending deformation, layer shifting, and fracture caused by the longer electrode assembly 1, ensuring the yield rate of the electrode assembly 1 and the battery cell. Moreover, the adjacent electrode assemblies 1 are directly electrically connected through the electrode tabs corresponding to each other. Compared with connecting a plurality of battery cells, the number of parts and the structural cost are reduced, and the space waste is also avoided, which is beneficial to the compact design of the battery pack.

[0067] Obviously, the above-mentioned 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 the 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. A frame structure is provided inside the battery cell, characterized in that The frame structure includes side plates (21), a first adjusting member (23) and a second adjusting member (24), wherein, The first adjusting member (23) is fixedly connected to the side plate (21), and in a direction away from the side plate (21), the second adjusting member (24) and the first adjusting member (23) are connected and arranged in a position-adjustable manner. The frame structure defines at least two accommodating spaces. The first adjusting member (23) and the second adjusting member (24) are located between two adjacent accommodating spaces. Each accommodating space can limit and accommodate a pole group (1). The first adjusting member (23) is provided with a first through groove (231), and the pole ear of the pole group (1) can pass through the first through groove (231) so that the adjacent pole groups (1) are electrically connected through the pole ears. The second adjusting member (24) is provided with two abutting portions (241), and the abutting portions (241) can cooperate with the side plate (21) to clamp and limit the pole group (1).

2. The frame structure according to claim 1, characterized in that One end of the first adjusting member (23) is connected to the side plate (21), and the other end of the first adjusting member (23) is provided with a mounting hole (232), and the second adjusting member (24) is slidably inserted into the mounting hole (232).

3. The frame structure according to claim 1, wherein The frame structure further includes a support plate (22), the support plate (22) is fixedly connected to the end of the side plate (21), and the support plate (22) is provided with a second through groove (221), and the pole ear can pass through the second through groove (221).

4. The frame structure according to claim 2, wherein Both the first adjusting member (23) and the second adjusting member (24) are hollow members, and the first adjusting member (23) and the second adjusting member (24) can communicate to form an exhaust passage. The side plate (21) or the first adjusting member (23) is provided with a first air hole (211), and the second adjusting member (24) is provided with a second air hole (242). The exhaust passage is communicated with the first air hole (211), the first through groove (231) and the second air hole (242). The first air hole (211) and the second air hole (242) are used for exhausting air.

5. The frame structure according to claim 4, wherein The battery cell further includes an insulating film (4) and a battery cell housing (5). The insulating film (4) is wrapped around the frame structure and the pole group (1), and the insulating film (4) is arranged between the battery cell housing (5) and the frame structure. The insulating film (4) is provided with a clearance hole (41), and the clearance hole (41), the first air hole (211) and the second air hole (242) are coaxially communicated. Gas can be discharged outside the insulating film (4) through the clearance hole (41).

6. The frame structure according to claim 5, characterized in that, The battery cell housing (5) is provided with an exhaust hole, and an explosion-proof valve (6) is installed in the exhaust hole. The exhaust hole is coaxially communicated with the clearance hole (41).

7. The frame structure according to claim 6, characterized in that, A rib (243) is provided at one end of the second adjusting member (24) away from the first adjusting member (23), and the rib (243) is used to prevent the explosion-proof valve (6) from being damaged during the assembly process.

8. The frame structure according to claim 5, wherein The insulating film (4) is further provided with at least two slit structures, each of the slit structures is arranged corresponding to one of the accommodating spaces, the battery cell housing (5) is provided with at least two explosion-proof valves (6), each of the explosion-proof valves (6) is arranged corresponding to one of the accommodating spaces, and each of the slit structures is arranged between the explosion-proof valve (6) and the accommodating space.

9. The frame structure according to claim 5, wherein The battery cell housing (5) is further connected with a positive electrode cover plate (31) and a negative electrode cover plate (33), the positive electrode cover plate (31) and the negative electrode cover plate (33) are fixedly connected to the battery cell housing (5), and are respectively connected corresponding to the electrode tabs. The positive electrode cover plate (31) is made of an aluminum structure, and the battery cell further includes an insulating member, and the insulating member is clamped between the positive electrode cover plate (31) and the electrode group (1).

10. The battery cell is characterized in that, It includes the frame structure according to any one of claims 1-9.

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