Cell stack and module-free battery system

Abstract

The utility model discloses a battery cell stacking body and a module-free battery system. The battery cell stacking body is used for the module-free battery system. The battery cell stack comprises a battery cell assembly and a support assembly. And a tab is arranged on the battery core assembly. The supporting assembly is connected with the battery cell assembly, a supporting block is arranged on the supporting assembly, and the supporting block is attached to a tab of the battery cell assembly and supports the tab. A first connecting piece is arranged at one end of the supporting assembly, a second connecting piece is arranged at the other end of the supporting assembly, the tab is located between the first connecting piece and the second connecting piece, a first convex column is convexly arranged at one end of the first connecting piece, and a first mounting hole matched with the first convex column is formed in the other end of the first connecting piece; and a second mounting hole matched with the second convex column is formed in the other end of the second convex column. The supporting blocks can support the tabs, stable support can be provided for the tabs, the reliability of the tabs is improved, the problem that the tabs are suspended and shake is reduced, and therefore the performance of a battery system is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of battery equipment, especially to a battery cell stack and a module-free battery system. BACKGROUND

[0002] In a battery module, busbars connect the pole tabs of each battery cell to realize the current conduction of the battery cell. The busbar can also provide physical support for the pole tab to ensure the stability of the pole tab during battery operation. However, the busbar increases the overall weight of the battery system and occupies the space of the battery system, thereby reducing the energy density and space utilization of the battery system.

[0003] When the module-free battery system does not set a busbar and uses a direct welding connection mode of the pole tab, the energy density and space utilization of the battery system can be improved. However, the pole tab loses the stable support provided by the busbar, which reduces the reliability of the pole tab and causes the pole tab to swing, thereby affecting the performance of the battery system. SUMMARY

[0004] The main purpose of the utility model is to provide a battery cell stack and a module-free battery system, which aims to solve the technical problem that the module-free battery cell stack does not set a busbar, which causes the pole tab to lose the stable support provided by the busbar and reduces the reliability of the pole tab.

[0005] To achieve the above-mentioned utility model purposes, the utility model provides a battery cell stack in the first aspect.

[0006] A battery cell stack for a module-free battery system comprises:

[0007] A battery cell assembly has a pole tab thereon;

[0008] A support assembly is connected to the battery cell assembly, and a support block is arranged on the support assembly, which is attached to the pole tab of the battery cell assembly and supports the pole tab;

[0009] One end of the support assembly is provided with a first connecting piece, and the other end is provided with a second connecting piece. The pole tab is located between the first connecting piece and the second connecting piece. One end of the first connecting piece is provided with a first protruding column, and the other end is provided with a first mounting hole matched with the first protruding column. One end of the second connecting piece is provided with a second protruding column, and the other end is provided with a second mounting hole matched with the second protruding column.

[0010] In one embodiment, the support block is provided with a hollow structure.

[0011] In one of the embodiments, the cell stack includes a side plate, the first connecting member is provided with a third protruding post, the side plate is provided with a third mounting hole, and the third protruding post is inserted into the third mounting hole.

[0012] In one of the embodiments, the second connecting member is provided with a fourth protruding post, the side plate is provided with a fourth mounting hole, and the fourth protruding post is inserted into the fourth mounting hole.

[0013] In one of the embodiments, the length direction of the third protruding post intersects with the length direction of the first protruding post; and / or

[0014] the length direction of the fourth protruding post intersects with the length direction of the second protruding post.

[0015] In one of the embodiments, the third mounting hole is provided in plurality, and the plurality of third mounting holes are arranged at the top of the side plate; and / or

[0016] the fourth mounting hole is provided in plurality, and the plurality of fourth mounting holes are arranged at the bottom of the side plate.

[0017] In one of the embodiments, the cell assembly includes a cell body and an aluminum fin, the cell body is attached to the side wall of the aluminum fin, the support assembly is provided with a first mounting portion adjacent to the side surface of the support block, the side wall of the aluminum fin is provided with a second mounting portion, and the first mounting portion is mounted to the second mounting portion.

[0018] In one of the embodiments, the cell stack includes a first insulating film, the first insulating film is arranged between the inner side wall at the top of the aluminum fin and the top of the cell body; and / or

[0019] the cell stack includes a second insulating film, the second insulating film is arranged between the inner side wall at the bottom of the aluminum fin and the bottom of the cell body.

[0020] In one of the embodiments, the cell stack includes a foam structure, and the foam structure is arranged at the tab.

[0021] The second aspect of the utility model discloses a module-free battery system, which comprises the cell stack.

[0022] Beneficial effects:

[0023] The utility model discloses a battery cell stack for a module-free battery system. The battery cell stack comprises a battery cell assembly and a support assembly. The battery cell assembly has a tab. The support assembly is connected to the battery cell assembly. The support assembly has a support block. The support block is attached to the tab of the battery cell assembly and supports the tab. One end of the support assembly has a first connector. The other end of the support assembly has a second connector. The tab is located between the first connector and the second connector. One end of the first connector has a first protruding column. The other end of the first connector has a first mounting hole that matches the first protruding column. One end of the second connector has a second protruding column. The other end of the second connector has a second mounting hole that matches the second protruding column. The first protruding column of one support assembly can be inserted into the first mounting hole of another support assembly. The second protruding column of one support assembly can be inserted into the second mounting hole of another support assembly, thereby connecting multiple support assemblies. The support block supports the tab. The tab is located between the first connector and the second connector, thereby providing stable support for the tab, improving the reliability of the tab, reducing the problem of the tab hanging and shaking, and improving the performance of the battery system. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 FIG. 1 is a structural schematic diagram of a battery cell stack according to an embodiment of the utility model.

[0025] Figure 2 FIG. 2 is a structural schematic diagram of a battery cell assembly and a support assembly according to an embodiment of the utility model.

[0026] Figure 3 FIG. 3 is a structural schematic diagram of a support assembly according to an embodiment of the utility model.

[0027] Figure 4 FIG. 4 is an enlarged view of A in FIG. 1. Figure 1

[0028] Figure 5 FIG. 5 is a structural schematic diagram of a side plate according to an embodiment of the utility model.

[0029] Wherein:

[0030] 100, battery cell assembly; 110, tab; 120, battery cell body; 130, aluminum fin; 131, second mounting portion;

[0031] 200, support assembly; 210, support block; 211, hollow structure; 220, first connector; 221, first protruding column; 222, first mounting hole; 230, second connector; 231, second protruding column; 232, second mounting hole; 240, third protruding column; 250, fourth protruding column; 260, first mounting portion;

[0032] 300, side plate; 310, third mounting hole; 320, fourth mounting hole; ​

[0033] 410, first insulating film; 420, second insulating film;

[0034] 500, foam structure.

[0035] The implementation, functional features and advantages of the utility model will be further described with reference to the drawings in combination with embodiments. DETAILED DESCRIPTION

[0036] It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not used to limit the utility model.

[0037] In the description of the utility model, it should be understood that the orientation or position relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0038] In the description of the utility model, it should be noted that, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, it can be directly connected, or indirectly connected through an intermediate medium, it can be the communication between two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0039] In the utility model, unless another definite provision and limitation, first feature is on second feature "on" or "under" can include that first and second features are in direct contact, also can include that first and second features are not in direct contact but contact through other feature between them.Moreover, first feature is on second feature "on", "above" and "on" include that first feature is directly above and obliquely above second feature, or only indicate that first feature is higher than second feature in horizontal height.First feature is under second feature "under", "below" and "under" include that first feature is directly below and obliquely below second feature, or only indicate that first feature is lower than second feature in horizontal height.

[0040] As shown in Figures 1 to 5 In some embodiments, an electric core stack is used for a module-free battery system.The electric core stack comprises an electric core assembly 100 and a support assembly 200.The electric core assembly 100 has a tab 110 on it.The support assembly 200 is connected with the electric core assembly 100, and the support assembly 200 is provided with a support block 210, which is attached to the tab 110 of the electric core assembly 100 and supports the tab 110.One end of the support assembly 200 is provided with a first connecting piece 220, and the other end is provided with a second connecting piece 230.The tab 110 is located between the first connecting piece 220 and the second connecting piece 230, and one end of the first connecting piece 220 is provided with a first protruding column 221, and the other end is provided with a first mounting hole 222 matched with the first protruding column 221.The other end of the second connecting piece 230 is provided with a second protruding column 231, and the other end is provided with a second mounting hole 232 matched with the second protruding column 231.

[0041] When assembled, the first protruding column 221 of one support assembly 200 can be inserted into the first mounting hole 222 of another support assembly 200.The second protruding column 231 of one support assembly 200 can be inserted into the second mounting hole 232 of another support assembly 200, so as to realize the connection of multiple support assemblies 200.The support block 210 can support the tab 110, and the tab 110 is located between the first connecting piece 220 and the second connecting piece 230, which can provide stable support for the tab 110, improve the reliability of the tab 110, reduce the problem of tab 110 hanging and shaking, and improve the performance of the battery system.

[0042] Specifically, the first protruding column 221 and the second protruding column 231 can be cylindrical.

[0043] Specifically, the support assembly 200 can be made of plastic.

[0044] In some embodiments, the support block 210 is provided with a hollow structure 211. The hollow structure 211 provided in the support block 210 can reduce the amount of material. By reasonably designing the shape, size and distribution of the hollow structure, the support block 210 can retain sufficient material to maintain strength at key stress points, and reduce material in secondary stress areas, thereby reducing the weight of the support block 210 without affecting the support function. For example, if the support block 210 is solid, the mass is large, which will increase the weight of the entire cell stack, and then affect the energy density of the battery system. After adopting the hollow structure 211, the weight of the support block 210 is reduced while meeting the demand of supporting the tab 110, and the material cost is also reduced.

[0045] The hollow structure 211 can increase air circulation. The cell will generate heat during charging and discharging. The hollow structure 211 provides a path for heat transfer, which helps to improve the heat dissipation efficiency and prevent the accumulation of heat from adversely affecting the performance of the cell and the support block 210.

[0046] In some embodiments, the cell stack includes a side plate 300, the first connecting piece 220 is provided with a third protruding column 240, the side plate 300 is provided with a third mounting hole 310, and the third protruding column 240 is inserted into the third mounting hole 310. In this way, the connection between the support assembly 200 and the side plate 300 can be achieved through the first connecting piece 220 and the second connecting piece 230, the overall structural stability of the battery stack can be improved to adapt to different working environments and working conditions, the cell connection process can be optimized, the consumption of parts can be reduced, and the volume energy density of the battery system can be improved.

[0047] Specifically, the third protruding column 240 can be a plug. Two adjacent tabs 110 can be located on the support surface of the support block 210 and in contact through the folded edge structure. After assembly, heat-conducting glue can be applied at the tabs 110. Then, the third mounting hole 310 on the side plate 300 is concentrically matched with the plug to tightly adhere to the heat-conducting glue, and the plug is melted by a hot melt gun to complete the fixed installation of the side plate 300 and the cell stack.

[0048] It should be noted that the plug is generally made of thermoplastic material, which has a certain shape and hardness at room temperature and can maintain its structural stability. When the plug is heated using a hot melt gun, the thermoplastic material absorbs heat and gradually melts, and the flowability increases. At this time, the plug can fill the small gap between the third mounting hole 310 of the side plate 300 and itself, and tightly adhere to the surrounding components. After the temperature decreases, the melted plug re-solidifies to form a firm connection structure, firmly connecting the side plate 300 and the cell stack.

[0049] The side plate 300 and the cell stack are fixed by means of the hot melt plug, which has a better fixing effect than the traditional screw connection. The screw connection may be loosened due to vibration. The integrated connection structure formed after the solidification of the hot melt plug can provide stronger connection force, effectively prevent the side plate 300 from loosening or falling off due to factors such as vibration, thermal expansion and cold shrinkage during battery use, and enhance the overall stability of the cell stack.

[0050] In some embodiments, the second connecting piece 230 is provided with a fourth protruding column 250, and the side plate 300 is provided with a fourth mounting hole 320, and the fourth protruding column 250 is inserted into the fourth mounting hole 320.

[0051] Specifically, the fourth protruding column 250 can be a plug. Two adjacent tabs 110 can be located on the support surface of the support block 210 and in contact through the folded edge structure. After assembly is completed, the heat-conducting glue can be applied at the tabs 110. Then the fourth mounting hole 320 on the side plate 300 is concentrically matched with the plug to tightly adhere to the heat-conducting glue, and the plug is melted by a hot melt gun to complete the fixed installation of the side plate 300 and the cell stack.

[0052] In some embodiments, the length direction of the third protruding column 240 intersects the length direction of the first protruding column 221, and the first connecting member can be subjected to force from multiple directions. When the cell stack is subjected to external force, the intersecting first protruding column 221 and third protruding column 240 can disperse the force to different directions, avoiding excessive stress concentration on the first connecting piece 220.

[0053] Specifically, the length direction of the fourth protruding column 250 intersects the length direction of the second protruding column 231, and the second connecting piece can be subjected to force from multiple directions. When the cell stack is subjected to external force, the intersecting second protruding column 231 and fourth protruding column 250 can disperse the force to different directions, avoiding excessive stress concentration on the second connecting piece 230.

[0054] Specifically, the third protruding column 240 and the fourth protruding column 250 can be cylindrical.

[0055] In some embodiments, the third mounting hole 310 is provided with a plurality of third mounting holes 310, and the plurality of third mounting holes 310 are arranged at the top of the side plate 300. The fourth mounting hole 320 is provided with a plurality of fourth mounting holes 320, and the plurality of fourth mounting holes 320 are arranged at the bottom of the side plate 300. The side plate 300 can be a rectangular plate.

[0056] When the side plate 300 is connected with the third protruding column 240 and the fourth protruding column 250, the plurality of third mounting holes 310 and the plurality of fourth mounting holes 320 are simultaneously stressed, and the force borne by the connection points can be dispersed to multiple positions of the side plate 300. For example, during the charging and discharging process of the battery, the thermal expansion and contraction of the battery cell will generate a force on the side plate 300, and the plurality of third mounting holes 310 and the plurality of fourth mounting holes 320 can uniformly disperse the force on the side plate 300, so as to avoid deformation or damage of the side plate 300 due to excessive force on a single point, and ensure the reliability of the connection between the battery cell stack and the side plate 300.

[0057] Specifically, the two adjacent third mounting holes 310 are equidistantly arranged. The two adjacent fourth mounting holes 320 are equidistantly arranged.

[0058] In some embodiments, the battery cell assembly 100 comprises the battery cell body 120 and the aluminum fin 130, the battery cell body 120 is attached to the side wall of the aluminum fin 130, the first mounting portion 260 is arranged adjacent to the side surface of the supporting block 210 of the supporting assembly 200, the side wall of the aluminum fin 130 is provided with the second mounting portion 131, and the first mounting portion 260 is mounted on the second mounting portion 131.

[0059] It should be noted that the large surface of the battery cell body 120 is attached to the side wall of the aluminum fin 130, the aluminum fin 130 has good heat conduction performance, can quickly conduct the heat generated by the battery cell body 120 away, ensures the battery cell body 120 to work in a suitable temperature range, and improves the performance and service life of the battery cell body 120. The first mounting portion 260 of the supporting assembly 200 and the second mounting portion 131 of the aluminum fin 130 are mounted in cooperation with each other, so that the supporting assembly 200 is tightly connected to the aluminum fin 130.

[0060] Specifically, the first mounting portion 260 can be provided in plurality. The second mounting portion 131 can be provided in plurality. The plurality of first mounting portions 260 and the plurality of second mounting portions 131 are arranged in one-to-one correspondence.

[0061] Specifically, the first mounting portion 260 is equidistantly arranged, the second mounting portion 131 is equidistantly arranged, and the distance between the two adjacent first mounting portions 260 is equal to the distance between the two adjacent second mounting portions 131.

[0062] Specifically, the first mounting portion 260 can be a protruding cylindrical platform. The second mounting portion 131 can be a through hole. During installation, the cylindrical platform is aligned with the through hole, and then adhesive is applied to fix the supporting assembly 200 and the aluminum fin 130.

[0063] In some embodiments, the battery cell stack comprises a first insulating film 410, which is arranged between the inner side wall of the top of the aluminum fin 130 and the top of the battery cell body 120.

[0064] It should be noted that during the operation of the battery cell body 120, the battery cell body 120 and the aluminum fin 130 are in direct contact, which may cause current leakage and lead to safety problems such as short circuit. The first insulating film 410 is made of a material with good insulating properties, such as polyimide, polypropylene, etc. The material has high resistance characteristics, which can effectively prevent current from passing through, isolate the battery cell body 120 and the aluminum fin 130, avoid electrical short circuit, and ensure the electrical safety of the battery system.

[0065] Specifically, the battery cell stack includes a second insulating film 420, which is arranged between the inner side wall of the bottom of the aluminum fin 130 and the bottom of the battery cell body 120. The second insulating film 420 has the same effect as the first insulating film 410, which will not be described here.

[0066] In some embodiments, the battery cell stack includes a foam structure 500 that is adapted to the tab 110. The foam structure 500 is arranged at the tab 110, and then the support assembly 200 is arranged at the tab 110, so that the tab 110 extends out and is attached to the surface of the support block 210 of the support assembly 200. The tab 110 is a key component for connecting the battery cell to the external circuit, and during the use of the battery system, it will be subjected to various external forces. For example, the vibration and bumping during vehicle driving, the internal stress changes caused by thermal expansion and contraction during battery charging and discharging, etc. The foam structure 500 has good elasticity and flexibility, which can effectively buffer these external forces, absorb vibration and impact force, reduce the shaking and displacement of the tab 110 due to external forces, prevent friction and collision between the tab 110 and other components, and thus protect the structural integrity and electrical connection stability of the tab 110.

[0067] In another embodiment, a module-free battery system includes the above-mentioned battery cell stack.

[0068] The above description is only preferred embodiments of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, as described in the specification and drawings of the present application, are also included in the patent protection scope of the present application.

Claims

1. An electric cell stack for a moduleless battery system, characterized by, The application relates to an electric cell stack body. The electric cell stack body comprises an electric cell assembly, a support assembly connected with the electric cell assembly, and a support block arranged on the support assembly and attached to the lug of the electric cell assembly. The support block is provided with a hollow structure. The electric cell stack body comprises a side plate, the first connecting piece is provided with a third protruding column, and the side plate is provided with a third mounting hole.

2. The electric cell stack of claim 1, wherein, The second connecting piece is provided with a fourth protruding column, and the side plate is provided with a fourth mounting hole.

3. The electric cell stack of claim 1, wherein, The length direction of the third protruding column intersects with the length direction of the first protruding column; and / or 4. The electric cell stack of claim 3, wherein, The length direction of the fourth protruding column intersects with the length direction of the second protruding column.

5. The electric cell stack of claim 4, wherein, The third mounting hole is provided with a plurality of third mounting holes which are arranged at the top of the side plate; and / or The fourth mounting hole is provided with a plurality of fourth mounting holes which are arranged at the bottom of the side plate.

6. The electric cell stack of claim 4, wherein, The electric cell assembly comprises an electric cell body and an aluminum fin, the electric cell body is attached to the side wall of the aluminum fin, the support assembly is provided with a first mounting part adjacent to the side of the support block, the side wall of the aluminum fin is provided with a second mounting part, and the first mounting part is mounted on the second mounting part. The electric cell stack body comprises a first insulating film arranged between the inner side wall of the top of the aluminum fin and the top of the electric cell body; and / or 7. The electric cell stack of claim 1, wherein, The electric cell stack body comprises a second insulating film arranged between the inner side wall of the bottom of the aluminum fin and the bottom of the electric cell body.

8. The electric cell stack of claim 7, wherein, The electric cell stack body comprises a foam structure arranged at the lug. The application further relates to an electric cell stack body.

9. The electric cell stack of claim 1, wherein, The application further relates to an electric cell stack body.

10. A module-less battery system, characterized by, ​

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