Battery cell structure and battery

Abstract

The utility model relates to the technical field of battery cells, in particular to a battery cell structure and a battery, the battery cell structure comprises a shell, a pole group assembly and a supporting assembly, and the pole group assembly and the supporting assembly are arranged in the shell. The pole group assembly comprises a plurality of pole group bodies which are sequentially and electrically connected in the length direction, the supporting assembly comprises a breathable cross beam extending in the width direction, the breathable cross beam is provided with a breathable channel communicated with the interior of the shell, the breathable cross beam is arranged between every two adjacent pole group bodies, and every two adjacent pole group bodies are electrically connected through the corresponding breathable cross beam. The width direction intersects the length direction. The shell is further provided with a first anti-explosion opening used for containing the first anti-explosion valve, the first anti-explosion opening is formed in the large face of the shell, the large face is parallel to the plane defined by the width direction and the length direction, and the first anti-explosion opening is communicated with the ventilation channel of the ventilation cross beam. According to the battery cell structure and the battery provided by the invention, gas in the middle of the shell can be quickly discharged, and the safety of the battery cell structure is improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery cells, and more particularly to a battery cell structure and a battery. Background Art

[0002] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields. To meet the requirements of high voltage and long driving range of vehicles and have lower costs, battery companies increase the energy density of single cells by increasing the length of single cells.

[0003] However, with the increase in the length of a single cell, the gas discharge path inside the battery cell is continuously elongated. In the event of an emergency such as overheating of the battery or the pressure inside the housing exceeding the threshold, the elongated gas path greatly affects the safety of the battery. Moreover, the explosion-proof valve of the current long battery cell is usually arranged on the narrow side of the battery cell housing (i.e., the end face of the housing in the width direction and / or the end face of the housing in the length direction), which is not conducive to the discharge of the gas accumulated at the center position of the long battery cell. Summary of the Utility Model

[0004] The purpose of the present application is to provide a battery cell structure and a battery, which can, to a certain extent, solve the technical problems existing in the prior art that with the increase in the length of a single cell, the gas discharge path inside the battery cell is continuously elongated. In the event of an emergency such as overheating of the battery or the pressure inside the housing exceeding the threshold, the elongated gas path greatly affects the safety of the battery. Moreover, the explosion-proof valve of the current long battery cell is usually arranged on the narrow side of the battery cell housing (i.e., the end face of the housing in the width direction and / or the end face of the housing in the length direction), which is not conducive to the discharge of the gas accumulated at the center position of the long battery cell.

[0005] According to a first aspect of the present application, a battery cell structure is provided, including a housing, a pole group assembly, and a support assembly. The housing has a length direction, and the pole group assembly and the support assembly are arranged inside the housing;

[0006] The pole group assembly includes a plurality of pole group bodies electrically connected in sequence along the length direction. The support assembly includes a breathable cross beam extending along the width direction. The breathable cross beam is provided with a breathable channel communicating with the inside of the housing. The breathable cross beam is arranged between two adjacent pole group bodies, and two adjacent pole group bodies are electrically connected via the breathable cross beam. The width direction intersects with the length direction;

[0007] The housing is further provided with a first explosion-proof port for installing a first explosion-proof valve. The first explosion-proof port is arranged on the large surface of the housing. The large surface is parallel to the plane determined by both the width direction and the length direction, and the first explosion-proof port communicates with the breathable channel of the breathable cross beam.

[0008] Preferably, the support assembly includes two support members, each support member including a support side plate and the breathable cross beam fixedly connected to each other, and the support side plates of the two support members are respectively attached to both sides of the electrode group assembly in the width direction;

[0009] The breathable cross beams of the two support members are arranged opposite to each other in the length direction.

[0010] Preferably, in the width direction, the size of the electrode group assembly is greater than or equal to twice the size of the breathable cross beam.

[0011] Preferably, the breathable cross beam includes breathable holes penetrating the breathable cross beam in the width direction.

[0012] Preferably, the breathable channel forms an opening on the side of the breathable cross beam facing the first explosion-proof port, and at least part of the opening is arranged opposite to the first explosion-proof port.

[0013] Preferably, it further includes connecting end plates, and the connecting end plates are arranged at both ends of the electrode group assembly in the length direction;

[0014] The two support side plates are respectively connected to both ends of the connecting end plate in the width direction.

[0015] Preferably, it further includes a cover plate, the cover plate is covered on the side of the connecting end plate facing away from the electrode group assembly, the connecting end plate is provided with a wire passing hole penetrating the connecting end plate in the length direction, and the electrode group assembly is electrically connected to the cover plate through the wire passing hole.

[0016] Preferably, the housing is further provided with a second explosion-proof port for arranging a second explosion-proof valve, the second explosion-proof port is arranged on the end face of the housing in the width direction, the number of the second explosion-proof ports is multiple, and each electrode group body is correspondingly provided with the second explosion-proof port.

[0017] Preferably, it further includes a protective sticker, the protective sticker is attached to the first explosion-proof port and the second explosion-proof port from the inside of the housing, and the protective sticker is provided with a breathable part penetrating the protective sticker.

[0018] According to a second aspect of the present application, there is provided a battery, including the battery cell structure according to any one of the above technical solutions. Therefore, it has all the beneficial technical effects of this battery cell structure, and will not be elaborated here.

[0019] Compared with the prior art, the beneficial effects of the present application are:

[0020] The battery cell structure provided in the present application arranges the electrode group assembly into a plurality of electrode group bodies electrically connected in sequence along the length direction, so that an air-permeable gap can be formed between two adjacent electrode group bodies, and an air-permeable cross beam is arranged in the air-permeable gap, which not only ensures the bending strength of the connection between the two adjacent electrode group bodies, but also effectively guides the gas accumulated in the middle part of the battery cell structure through the air-permeable channel of the air-permeable cross beam, and guides the gas to be discharged through the first explosion-proof opening on the large surface. In this way, setting the explosion-proof valve on the large surface of the shell can effectively shorten the exhaust path in the middle part of the battery cell structure, ensure the rapid discharge of the gas in the middle part of the shell, and thus improve the safety of the battery cell structure.

[0021] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 A schematic diagram of the isometric structure of a battery cell structure provided in an embodiment of the present application;

[0024] Figure 2 A schematic diagram of the axonometric structure of a support assembly provided in an embodiment of the present application;

[0025] Figure 3 A schematic diagram of the front view of the battery cell structure provided in an embodiment of the present application;

[0026] Figure 4 A bottom-up structural schematic diagram of a battery cell structure provided in an embodiment of the present application;

[0027] Figure 5 for Figure 4 A schematic diagram of a cross-sectional structure of a provided battery cell structure obtained by cutting along the AA direction;

[0028] Figure 6 For along Figure 4 The shell is cut in the BB direction to obtain a schematic diagram of the cut local structure;

[0029] Figure 7 A schematic diagram of the front view structure of the protective sticker provided in an embodiment of the present application;

[0030] Figure 8 A schematic diagram of the axonometric structure of a support member provided in an embodiment of the present application;

[0031] Figure 9 Isometric structural schematic diagram of the connection end plate provided by the embodiment of the present application;

[0032] Figure 10 Partial enlarged view of the assembly structure of the support member and the connection end plate provided by the embodiment of the present application.

[0033] Reference numerals:

[0034] 1 - Support member; 11 - Support side plate; 111 - Fitting piece; 112 - Fitting rib; 113 - Claw; 12 - Ventilation cross beam; 121 - Ventilation hole; 122 - Communication groove; 123 - Ventilation channel; 13 - Connection end plate; 131 - Threading hole; 132 - Card slot; 21 - Pole group body; 22 - Pole ear; 31 - First explosion-proof valve; 32 - Second explosion-proof valve; 4 - Protective sticker; 41 - Ventilation part; 5 - Cover plate; 51 - Pole column; 6 - Housing; 7 - Insulating film.

[0035] L - Length direction; W - Width direction; T - Thickness direction. Detailed implementation manners

[0036] The technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present application.

[0037] The components of the embodiments of the present application usually described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application claimed, but merely represents the selected embodiments of the present application.

[0038] All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without making creative efforts shall fall within the protection scope of the present application.

[0039] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, 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 of the present application. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0040] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; 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 communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0041] The following refers to Figures 1 to 10 Describe the cell structure and battery according to some embodiments of the present application.

[0042] Refer to Figures 1 to 10 As shown, an embodiment of the first aspect of the present application provides a cell structure, which includes a housing 6, a pole group assembly, and a support assembly. The housing 6 has a length direction L, and the pole group assembly and the support assembly are disposed inside the housing 6. The pole group assembly includes a plurality of pole group bodies 21 that are electrically connected in sequence along the length direction L. The support assembly includes a breathable cross beam 12 that extends along the width direction W. The breathable cross beam 12 is provided with a breathable channel 123 that communicates with the inside of the housing 6. The breathable cross beam 12 is disposed between two adjacent pole group bodies 21, and two adjacent pole group bodies 21 are electrically connected via the breathable cross beam 12. The width direction W intersects with the length direction L. The housing 6 is further provided with a first explosion-proof port for accommodating a first explosion-proof valve 31. The first explosion-proof port is disposed on a large surface of the housing 6. The large surface is parallel to the plane determined by both the width direction W and the length direction L, and the first explosion-proof port communicates with the breathable channel 123 of the breathable cross beam 12.

[0043] According to the cell structure provided by the above technical features, the pole group assembly is set as a plurality of pole group bodies 21 that are electrically connected in sequence along the length direction L, which enables an air-permeable gap to be formed between two adjacent pole group bodies 21, and the breathable cross beam 12 is disposed in the air-permeable gap, which not only ensures the bending strength at the connection of two adjacent pole group bodies 21, but also effectively channels the gas accumulated inside the middle part of the cell structure through the breathable channel 123 of the breathable cross beam 12, and channels the gas to the first explosion-proof port on the large surface for discharge. In this way, by disposing the explosion-proof valve on the large surface of the housing 6, the exhaust path at the middle position of the cell structure can be effectively shortened, ensuring the rapid discharge of the gas in the middle of the housing 6, and thus improving the safety of the cell structure.

[0044] As Figures 1 to 10As shown, L shown in the figure can be an example of the length direction L, and W shown in the figure can be an example of the width direction W. Preferably, the length direction L and the width direction W are perpendicular to each other to accommodate square shell batteries. For ease of description, the plane perpendicular to the length direction L and the width direction W is defined as the thickness direction T. T shown in the figure can be an example of the thickness direction T.

[0045] Preferably, if Figure 2 As shown, the support assembly may include two support members 1, and the support member 1 may include support side plates 11 and the above-mentioned air-permeable cross beams 12 that are fixedly connected to each other, and the support side plates 11 of the two support members 1 are respectively attached to the two sides of the pole group assembly in the width direction W. The air-permeable cross beams 12 of the two support members 1 are arranged opposite to each other in the length direction L, so that the structure of the support side plates 11 can not only straighten the pole group assembly, but also effectively enhance the bending strength of the pole group assembly, and effectively reduce the probability of bending, deformation, and fracture of the pole group assembly.

[0046] Preferably, if Figure 5 As shown, the above-mentioned air passage 123 forms an opening on the side of the air beam 12 facing the first explosion-proof port, and at least a part of the opening is arranged opposite to the first explosion-proof port. In this way, on the one hand, by arranging a hollow air passage on the air beam 12, the weight and material cost of the air beam 12 can be effectively reduced; on the other hand, the air passage 123 is arranged to form an opening on the side of the air beam 12 facing the first explosion-proof port, thereby effectively facilitating the gas to be discharged to the first explosion-proof port, thereby facilitating the gas discharge.

[0047] Preferably, if Figure 5 As shown, the above openings are distributed all over the side of the air-permeable cross beam 12 facing the first explosion-proof opening. Thus, at least another part of the above openings is staggered with the first explosion-proof opening to facilitate the gas in the shell 6 to enter the air-permeable channel 123 .

[0048] Preferably, if Figure 5 and Figure 8 As described above, the air-permeable cross beam 12 may include a connecting groove 122 that penetrates the air-permeable cross beam 12 along the length direction L, so as to connect the pole ears 22 of two adjacent pole group bodies 21. In this way, the pole ears 22 of the pole group bodies 21 only extend along the length direction L, so that the two adjacent pole group bodies 21 can be overlapped with each other, thereby effectively avoiding the bending of the pole ears 22 and effectively reducing the probability of the pole ears 22 being torn.

[0049] Preferably, if Figure 1 , Figure 2 , Figure 5 and Figure 8As shown, the above-mentioned connecting groove 122 is open on one side of the breathable cross beam 12 in the thickness direction T, thereby facilitating the overlapping operation of two adjacent pole group bodies 21.

[0050] Optionally, as Figure 5 shown, the above-mentioned battery cell structure may further include an insulating film 7, and the insulating film 7 may cover the outer side of the assembled structure of both the pole group assembly and the support assembly to achieve insulation between the assembled structure and the housing 6.

[0051] Optionally, as Figure 1 、 Figure 2 and Figure 8 shown, the above-mentioned support side plate 11 may include a fitting piece 111 and a fitting rib 112 that both extend along the length direction L. Among them, in the thickness direction T, the size of the fitting piece 111 is larger than the size of the fitting rib 112, and the fitting piece 111 and the fitting rib 112 may be alternately arranged along the length direction L. In this way, on the premise of ensuring the bending strength of the support side plate 11 and the ability to straighten the pole group assembly, the material and weight of the support side plate 11 are effectively saved.

[0052] Optionally, as Figure 8 shown, both ends of the above-mentioned support side plate 11 in the length direction L are fitting ribs 112, and clamping claws 113 may be provided at both ends of the above-mentioned support side plate 11 in the length direction L for fixing the support side plate 11.

[0053] Preferably, as Figure 2 and Figure 10 shown, the above-mentioned battery cell structure may further include a connection end plate 13, and connection end plates 13 are provided at both ends of the pole group assembly in the length direction L. The two support side plates 11 are respectively connected to both ends of the connection end plate 13 in the width direction W to achieve the fixation of the support side plates 11.

[0054] Optionally, as Figure 9 described, clamping grooves 132 are provided in the middle of the edges on both sides of the above-mentioned connection end plate 13 in the width direction W, and the clamping claws 113 are clamped with the clamping grooves 132 to improve the connection accuracy and connection stability between the connection end plate 13 and the support side plate.

[0055] Preferably, as Figure 2 and Figure 4 shown, in the width direction W, the size of the pole group assembly is greater than or equal to twice the size of the breathable cross beam 12. In this way, when the two support members 1 are arranged opposite to each other in the width direction W, the breathable cross beams 12 of the two support members 1 are effectively prevented from interfering with each other.

[0056] Preferably, as Figure 1 、 Figure 2 and Figure 4As shown, the above-mentioned housing 6 may also be provided with a second explosion-proof port for installing the second explosion-proof valve 32. The second explosion-proof port is provided on the end face of the housing 6 in the width direction W. The number of the second explosion-proof ports is multiple, and each pole group body 21 is correspondingly provided with a second explosion-proof port to further facilitate the discharge of gas in the housing 6.

[0057] Preferably, as Figure 1 , Figure 2 and Figure 5 shown, the above-mentioned breathable crossbeam 12 may also include breathable holes 121 penetrating the breathable crossbeam 12 in the width direction W. On the one hand, it facilitates the gas in the housing 6 to enter the breathable channel 123; on the other hand, through the breathable holes 121, the breathable channel 123 is connected to the gap between the housing 6 and the support side plate, and then the second explosion-proof port is connected to the breathable channel 123 to further improve the safety of the battery cell structure.

[0058] Preferably, as Figure 1 and Figure 6 shown, the above-mentioned battery cell structure may also include a protective sticker 4. The protective sticker 4 can be attached to the first explosion-proof port and the second explosion-proof port from the inside of the housing 6. The protective sticker 4 is provided with a breathable part 41 penetrating the protective sticker 4. In this way, on the one hand, attaching the protective sticker 4 to the first explosion-proof port and the second explosion-proof port from the inside of the housing 6 can effectively prevent the pole group assembly from scratching the first explosion-proof valve 31 and the second explosion-proof valve 32 during the process of the pole group assembly penetrating into the housing 6; on the other hand, through the breathable part 41 of the protective sticker 4, the exhaust smoothness of the first explosion-proof valve 31 and the second explosion-proof valve 32 can be effectively guaranteed.

[0059] Optionally, as Figure 7 shown, the above-mentioned breathable part 41 may be a cutting line. However, it is not limited to this. The above-mentioned breathable part 41 may also be a hole or a mesh, etc.

[0060] Preferably, as Figure 1 and Figure 2 shown, the above-mentioned long battery cell device may also include a cover plate 5. The cover plate 5 is covered on the side of the connection end plate 13 facing away from the battery cell assembly. On the one hand, it realizes the assembly of the pole group assembly and the cover plate 5; on the other hand, through the above-mentioned connection end plate 13, insulation between the cover plate 5 and the battery cell assembly is achieved, thereby effectively saving the lower plastic part structure of the battery cell and further improving the space utilization rate of the battery cell structure.

[0061] Preferably, as Figure 2 and Figure 9 shown, the above-mentioned connection end plate 13 may also be provided with a wire passing hole 131 penetrating the connection end plate 13 in the length direction L to facilitate the electrical connection between the pole group assembly and the cover plate 5 through the wire passing hole 131.

[0062] Preferably, as Figure 1 ,Figure 2 and Figure 4 As shown in Figure 4 , the cover plate 5 may be provided with a terminal post 51, and the above-mentioned battery cell assembly may be electrically connected to the terminal post 51.

[0063] Optionally, as Figure 10 shown, the above-mentioned terminal post 51 and the above-mentioned cover plate 5 may be integrally formed to compress the space occupied by the terminal post 51, so as to further improve the energy volume density of the battery cell structure.

[0064] Correspondingly, as Figure 1 shown, the above-mentioned cover plate 5 may also cover both ends of the housing 6 in the length direction L to enclose a sealed space for accommodating both the above-mentioned electrode group assembly and the support assembly.

[0065] An embodiment of the second aspect of the present application further provides a battery, including the battery cell structure described in any of the above embodiments. Therefore, it has all the beneficial technical effects of this battery cell structure and will not be elaborated herein.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cell structure, characterized in that, It includes a housing, a pole group assembly, and a support assembly. The housing has a length direction, and the pole group assembly and the support assembly are disposed inside the housing; The pole group assembly includes a plurality of pole group bodies electrically connected in sequence along the length direction. The support assembly includes a breathable cross beam extending along the width direction. The breathable cross beam is provided with a breathable channel communicating with the inside of the housing. The breathable cross beam is disposed between two adjacent pole group bodies, and two adjacent pole group bodies are electrically connected via the breathable cross beam. The width direction intersects with the length direction; The housing is further provided with a first explosion-proof port for installing a first explosion-proof valve. The first explosion-proof port is disposed on a large surface of the housing. The large surface is parallel to the plane determined by both the width direction and the length direction, and the first explosion-proof port communicates with the breathable channel of the breathable cross beam.

2. The cell structure according to claim 1, characterized in that The support assembly includes two support members. The support member includes a support side plate and the breathable cross beam fixedly connected to each other. The support side plates of the two support members are respectively attached to both sides of the pole group assembly in the width direction; The breathable cross beams of the two support members are disposed opposite to each other in the length direction.

3. The cell structure according to claim 2, wherein In the width direction, the size of the pole group assembly is greater than or equal to twice the size of the breathable cross beam.

4. The battery cell structure according to claim 2, wherein, The breathable cross beam includes breathable holes penetrating the breathable cross beam along the width direction.

5. The cell structure according to claim 2, wherein The breathable channel forms an opening on a side of the breathable cross beam facing the first explosion-proof port, and at least part of the opening is disposed opposite to the first explosion-proof port.

6. The battery cell structure according to any one of claims 2 to 5, characterized in that, It further includes connection end plates. The connection end plates are disposed at both ends of the pole group assembly in the length direction; The two support side plates are respectively connected to both ends of the connection end plate in the width direction.

7. The cell structure according to claim 6, wherein, It further includes a cover plate. The cover plate covers a side of the connection end plate facing away from the pole group assembly. The connection end plate is provided with a wire passing hole penetrating the connection end plate along the length direction. The pole group assembly is electrically connected to the cover plate via the wire passing hole.

8. The cell structure according to any one of claims 1 to 5, characterized in that, The housing is further provided with a second explosion-proof port for installing a second explosion-proof valve. The second explosion-proof port is disposed on an end face of the housing in the width direction. The number of the second explosion-proof ports is multiple, and each pole group body is correspondingly provided with the second explosion-proof port.

9. The cell structure according to claim 8, wherein It further includes a protective sticker. The protective sticker is attached to the first explosion-proof port and the second explosion-proof port from the inside of the housing. The protective sticker is provided with a breathable part penetrating the protective sticker.

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

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