Battery cell

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery cell which comprises a shell, a pole group support, a pole group unit, a pole lug support and two end plates, the two ends of the shell are open, the pole group support is installed in the shell, the pole group unit is installed on the pole group support, the pole group unit comprises at least two pole groups which are connected in series, and the pole lug support is installed on the pole group support. The two ends of each pole group are provided with pole lugs, the pole lug support is connected to the pole group support and located between the two adjacent pole groups, the pole lug support is provided with first pole lug penetrating holes allowing the pole lugs to penetrate through, and the two end plates are installed at the two ends of the pole group support respectively and can seal the open end of the shell; and the two end plates are conductively connected with the positive electrode and the negative electrode of the electrode group unit respectively. The overall length of the battery cell is relatively long, the capacity is relatively large, the length of a single pole group in the battery cell is relatively short, the probability of bending deformation caused by overlong pole groups is reduced, the connection yield between the pole groups in the battery cell is high, and the phenomenon of short circuit is not easy to occur.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to an electric core. 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, and the requirements for the use performance and safety of lithium-ion batteries are increasing day by day. The structural design of the lithium battery core is crucial for the safety of the whole package.

[0003] In the existing electric core structure, there is a pole group structure with a relatively long single body length. Due to its strength problem, this pole group structure often bends and deforms, resulting in a reduced yield. In the existing electric core structure, there is also a structural scheme in which multiple pole groups with shorter lengths are connected in series to form a long pole group. However, during the series connection of multiple pole groups, the pole ears are prone to overlap during bending, and the protection is insufficient. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an electric core. The overall length of the electric core is relatively long, the capacity is relatively large, the length of a single pole group in the electric core is relatively short, the probability of bending and deforming caused by the overlong pole group is reduced, and the connection yield between pole groups in the electric core is high and the phenomenon of short circuit is not easy to occur.

[0005] To achieve the above object, the utility model adopts the following technical solutions:

[0006] The utility model discloses an electric core, comprising: a housing with both ends thereof being open; a pole group bracket installed in the housing; a pole group unit installed on the pole group bracket, and the pole group unit includes at least two pole groups connected in series, and pole ears are arranged at both ends of each pole group; a pole ear bracket connected to the pole group bracket and located between two adjacent pole groups, and the pole ear bracket is provided with a first pole ear through hole for the pole ear to pass through; two end plates respectively installed at both ends of the pole group bracket and capable of closing the open ends of the housing, and the two end plates are respectively electrically connected to the positive electrode and the negative electrode of the pole group unit.

[0007] In some embodiments, an installation groove is formed at the end of each pole group, the pole ear is located in the installation groove, and among two adjacent pole groups, the pole ear of one pole group can extend into the installation groove of the other pole group and be welded to the pole ear of this pole group.

[0008] In some embodiments, the tab holder includes: a holder body, both ends of the holder body are respectively connected to the electrode group holder, the holder body is provided with a tab receiving cavity, at least one end of the tab receiving cavity is open, and the side wall of the tab receiving cavity is provided with the first tab perforation; a plug cover, the plug cover is connected to the holder body and is used to block the open end of the tab receiving cavity.

[0009] In some specific embodiments, a limiting groove is provided on the side wall of the electrode group holder, and the end of the holder body is snap-fitted into the limiting groove; and / or: the plug cover has a stopping portion and an inserting portion, the inserting portion is inserted into the tab receiving cavity, and the stopping portion stops against the holder body.

[0010] In some embodiments, the housing includes two first side walls and two second side walls, the area of the first side wall is smaller than the area of the second side wall, and a first explosion-proof valve is provided on the first side wall; the electrode group holder has a first support plate disposed toward the first side wall, the first support plate stops against the side wall of the electrode group, and an air flow channel is defined between the first support plate and the first side wall.

[0011] In some specific embodiments, a plurality of stopping protrusions are provided on the first support plate, the plurality of stopping protrusions are spaced along the length direction of the electrode group holder, and the stopping protrusions stop against the first side wall of the housing.

[0012] In some specific embodiments, the battery cell further includes an insulating film, the insulating film is sleeved on the electrode group holder, and an explosion-proof notch corresponding to the first explosion-proof valve is provided on the insulating film.

[0013] In some embodiments, the electrode group holder includes two second support plates spaced apart from the tab holder, the two second support plates are respectively used to support the two end plates, and a second tab perforation is provided on each second support plate, and the positive electrode and the negative electrode of the electrode group unit respectively pass through the second tab perforation and are electrically connected to the two end plates.

[0014] In some specific embodiments, one of the second support plates is provided with a support rib and a deformation groove, the extending direction of the support rib is parallel to the extending direction of the second tab perforation, and the support rib stops against the end plate, the extending direction of the deformation groove is perpendicular to the extending direction of the second tab perforation, and the deformation groove divides the end portion of the electrode group holder into two parts.

[0015] In some embodiments, the end plate is provided with a protruding portion and an explosion-proof valve mounting hole, the protruding portion is used to realize the electrical connection between the plurality of battery cells, and the explosion-proof valve mounting hole is used to mount a second explosion-proof valve.

[0016] Beneficial effects of the battery cell of the present utility model: The battery cell in this embodiment designs the integral electrode group inside the battery cell in the prior art into a split electrode group unit formed by connecting multiple electrode groups in series, reducing the length of a single electrode group, thereby reducing the probability of defects such as wrinkles, deformations, layer displacement, and fractures caused by the large length of the electrode sheets in the electrode group, which is beneficial to improving the working reliability of the battery cell. The tabs of two adjacent electrode groups in the electrode group unit are welded together to achieve the series connection of the two electrode groups, and an electrode tab bracket for supporting the electrode tabs is provided. The electrode tab bracket is provided with a first electrode tab through-hole for the electrode tabs to pass through. When splicing on both sides, the two electrode groups are exactly fixed completely. On the one hand, it plays a role in balancing and fixing and protecting the connection position of the electrode tabs. On the other hand, it is convenient for installation and disassembly, and ensures the balance of the thrust when the electrode group enters the shell, insulating and isolating the two electrode groups. Compared with the way of realizing series and parallel connections through electrode tabs for multiple battery cells in the prior art, the series and parallel connections of multiple battery cells in this embodiment are realized through the connection of end plates, with high connection reliability and not prone to short-circuit phenomena.

[0017] Additional aspects and advantages of the present utility model will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present utility model. Description of the Drawings

[0018] Figure 1 is the exploded structural schematic diagram of the battery cell of the embodiment of the present utility model;

[0019] Figure 2 is the structural schematic diagram of the electrode group bracket of the embodiment of the present utility model;

[0020] Figure 3 is Figure 2 the structural schematic diagram of removing the electrode group of the structure shown;

[0021] Figure 4 is Figure 3 the enlarged schematic diagram of the circled area A;

[0022] Figure 5 is Figure 3 the enlarged schematic diagram of the circled area B;

[0023] Figure 6 is the structural schematic diagram of the electrode group bracket implemented by the present utility model;

[0024] Figure 7 is the structural schematic diagram of the electrode group of the embodiment of the present utility model;

[0025] Figure 8 is the structural schematic diagram of the electrode tab bracket of the embodiment of the present utility model;

[0026] Figure 9 is the exploded structural schematic diagram of the electrode tab bracket of the embodiment of the present utility model;

[0027] Figure 10 It is a top view structural schematic diagram of the tab support in the embodiment of the present utility model;

[0028] Figure 11 is Figure 10 the cross-sectional view taken along the C-C direction shown in the figure.

[0029] Reference numerals:

[0030] 100, housing; 110, first side wall; 120, second side wall;

[0031] 200, electrode group unit; 210, electrode group; 211, tab; 212, mounting groove;

[0032] 300, electrode group support; 310, first support plate; 311, limiting groove; 312, abutting protrusion; 320, second support plate; 321, second tab perforation; 322, support rib; 323, deformation groove;

[0033] 400, tab support; 410, support body; 411, first tab perforation; 412, tab accommodation cavity; 420, plug cover; 421, abutting portion; 422, insertion portion;

[0034] 500, end plate; 510, protruding portion;

[0035] 600, insulating film; 610, explosion-proof notch;

[0036] 700, first explosion-proof valve; 800, second explosion-proof valve. Detailed implementation manners

[0037] 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. Additionally, it should be noted that for the sake of description, only parts related to the present utility model are shown in the accompanying drawings, rather than all the structures.

[0038] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", 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 circumstances.

[0039] 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 additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" 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", "beneath" and "underneath" 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.

[0040] 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. They are only for the convenience of description and simplifying the operations, 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.

[0041] The present utility model discloses a battery cell, such as Figure 1As shown in the figure, the battery cell includes a housing 100, a pole group bracket 300, a pole group unit 200, an ear bracket 400 and two end plates 500. Both ends of the housing 100 are open. The pole group bracket 300 is installed inside the housing 100. The pole group unit 200 is installed on the pole group bracket 300. And the pole group unit 200 includes at least two serially arranged pole groups 210. At both ends of each pole group 210, there are pole ears 211. The ear bracket 400 is connected to the pole group bracket 300 and is located between two adjacent pole groups 210. The ear bracket 400 has a first ear perforation 411 for the pole ears 211 to pass through. The two end plates 500 are respectively installed at both ends of the pole group bracket 300 and can close the open ends of the housing 100. The two end plates 500 are respectively electrically connected to the positive and negative electrodes of the pole group unit 200. It can be understood that the battery cell in this embodiment designs the integral pole group inside the battery cell in the prior art into a split pole group unit 200 formed by connecting multiple pole groups 210 in series, reducing the length of a single pole group 210, thereby reducing the probability of defects such as wrinkles, deformations, layer displacement, and fractures caused by the large length of the pole pieces of the pole group 210, which is beneficial to improving the working reliability of the battery cell. The pole ears 211 of two adjacent pole groups 210 in the pole group unit 200 are welded to achieve the series connection of the two pole groups 210. And an ear bracket 400 for supporting the pole ears 211 is provided. The ear bracket 400 is provided with a first ear perforation 411 for the pole ears 211 to pass through. When splicing on both sides, the two pole groups 210 are exactly fixed completely. On the one hand, it plays a role in balancing and fixing and protects the connection position of the pole ears 211. On the other hand, it is convenient for installation and disassembly, and ensures the balance of the thrust when the pole group 210 enters the housing, and insulates and isolates the two pole groups 210. Compared with the way of realizing series and parallel connection through pole ears for multiple battery cells in the prior art, the series and parallel connection of multiple battery cells in this embodiment is realized through the connection of the end plates 500, with high connection reliability and not prone to short-circuit phenomena. In addition, the end plates 500 are directly connected to the positive and negative electrodes of the pole group unit 200, reducing the number of structural parts and realizing the functions of cost reduction and internal resistance reduction of the battery cell.

[0042] It should be added that, in order to ensure the stability of the pole group 210, the pole group 210 can be fixed to the pole group bracket 300 by means such as adhesion and heat melting. In addition, in the embodiments of the present invention, the number of pole groups 210 can be two, three or even more, and can be specifically selected according to actual needs. When the number of pole groups 210 is two, the positive and negative electrodes of the pole group unit 200 are respectively served by the pole ears 211 of the two pole groups 210 facing away from each other. When the number of pole groups 210 is greater than two, the positive and negative electrodes of the pole group unit 200 are respectively served by the free pole ears 211 of the two pole groups 210 located at the ends.

[0043] Reference Figures 1-3As shown, the outer shell 100 includes two first side walls 110 and two second side walls 120. The area of the first side wall 110 is smaller than that of the second side wall 120. A first explosion-proof valve 700 is provided on the first side wall 110; as Figure 6 As shown, the pole group support 300 has a first support plate 310 disposed toward the first side wall 110. The first support plate 310 abuts against the side wall of the pole group 210 and defines an air flow channel with the first side wall 110. It can be understood that an air flow channel is defined between the first support plate 310 of the pole group support 300 and the first side wall 110 of the outer shell 100. In this way, an annular exhaust channel can be formed after the battery cell is assembled, and pressure can be released in time when the battery cell undergoes thermal runaway, which is beneficial to improving the safety of the battery cell.

[0044] Optionally, referring to Figure 1 As shown, the battery cell further includes an insulating film 600. The insulating film 600 is sleeved on the pole group support 300. An explosion-proof notch 610 corresponding to the first explosion-proof valve 700 is provided on the insulating film 600. The insulating film 600 is disposed between the outer shell 100 and the pole group 210. The insulating film 600 can achieve the overall wrapping of the pole group unit 200 and improve the insulation protection ability of the battery cell.

[0045] Optionally, as Figures 3-4 As shown, a plurality of abutting protrusions 312 are provided on the first support plate 310. The plurality of abutting protrusions 312 are arranged at intervals along the length direction of the pole group support 300. The abutting protrusions 312 abut against the insulating film 600. It can be understood that on the one hand, the plurality of abutting protrusions 312 can improve the strength of the pole group support 300 to ensure that the pole group support 300 can stably support the pole group 210, and on the other hand, the first support plate 310 and the first side wall 110 can be spaced apart to ensure the formation of the air flow channel.

[0046] Referring to Figures 3-6As shown, the electrode group bracket 300 further includes two second support plates 320 spaced apart from the tab bracket 400. The two second support plates 320 are respectively connected to two ends of the two first support plates 310, and the two second support plates 320 are respectively used to support the two end plates 500. A second tab perforation 321 is provided on each second support plate 320. The positive and negative electrodes of the electrode group unit 200 respectively pass through the second tab perforation 321 and are electrically connected to the two end plates 500. It can be understood that the electrode group bracket 300 is composed of two first support plates 310 and two second support plates 320, realizing that the periphery of the electrode group 210 is supported. The electrode group bracket 300 adopts an overall design and can be formed by a mature process (injection molding), reducing the number of parts and simplifying the assembly process. The two second support plates 320 respectively used to support the two end plates 500 can ensure that the two end plates 500 are stably connected to the positive and negative electrodes of the electrode group unit 200, ensuring that the two end plates 500 serve as the positive and negative electrodes of the battery cell respectively. In addition, the positive and negative electrodes of the electrode group unit 200 respectively pass through the second tab perforation 321 and are electrically connected to the two end plates 500. The second tab perforation 321 plays a supporting role for the positive and negative electrodes of the electrode group unit 200, ensuring that the two end plates 500 are stably connected to the positive and negative electrodes of the electrode group unit 200 and preventing the positive and negative electrodes from being bent.

[0047] Optionally, referring to Figure 5 As shown, a support rib 322 and a deformation groove 323 are provided on one of the second support plates 320. The extending direction of the support rib 322 is parallel to the extending direction of the second tab perforation 321, and the support rib 322 abuts against the end plate 500. The extending direction of the deformation groove 323 is perpendicular to the extending direction of the second tab perforation 321, and the deformation groove 323 divides the end part of the electrode group bracket 300 into two parts. It can be understood that the existence of the deformation groove 323 can facilitate the installation of the electrode group 210 into the installation position defined by the first support plate 310, the second support plate 320 and the tab bracket 400. On the one hand, the support rib 322 can enhance the strength of the second support plate 320 and prevent it from deforming too much. On the other hand, it can play a role in supporting the end plate 500 and ensuring the stability of the end plate 500.

[0048] Referring to Figure 5As shown, the end plate 500 is provided with a protruding portion 510 and an explosion-proof valve mounting hole. The protruding portion 510 is used to achieve electrical connection between multiple battery cells, and the explosion-proof valve mounting hole is used to mount the second explosion-proof valve 800. It can be understood that the electrical connection between multiple battery cells is achieved through the protruding portion 510 on the substrate, eliminating other components such as pole posts and plastic parts in the prior art, which is beneficial to reducing the total length of the battery cells and thus improving the energy density of the battery cells. In addition, by installing the second explosion-proof valve 800 on the two end plates 500, an exhaust channel can be formed between the two end plates 500. Due to the existence of the first tab perforation 411, the exhaust channel is unobstructed, increasing the exhaust efficiency and shortening the airway travel, thereby improving the safety of the battery cells.

[0049] Reference Figure 7 As shown, each end of the pole group 210 has a mounting groove 212, and the tab 211 is located in the mounting groove 212. Among two adjacent pole groups 210, the tab 211 of one pole group 210 can extend into the mounting groove 212 of the other pole group 210 and be welded to the tab 211 of this pole group 210. First of all, it should be noted that in the prior art, during the connection process of the tabs of the battery cells, the tabs are prone to bending, prone to lapping, and the protection of the connection part is not sufficient. In addition, when the tabs are bent and connected in a C-shaped or S-shaped manner, the tab length is relatively long, which is not conducive to improving the energy density of the battery cells. In this embodiment, a mounting groove 212 for accommodating the tab 211 is provided at each end of the pole group 210, and the tabs 211 of the two pole groups 210 are connected inside the mounting groove 212. On the one hand, the phenomenon of tab 211 bending is not likely to occur, and on the other hand, it can protect the connection position of the two tabs 211, shortening the connection length of the two tabs 211, which is beneficial to improving the energy density of the battery cells.

[0050] Reference Figures 8-9As shown in the figure, the tab holder 400 includes a holder body 410 and a plug cover 420. The two ends of the holder body 410 are respectively connected to the tab group holder 300. An ear accommodating cavity 412 is provided on the holder body 410. At least one end of the ear accommodating cavity 412 is open, and a first tab perforation 411 is provided on the side wall of the ear accommodating cavity 412. The plug cover 420 is connected to the holder body 410 and is used to block the open end of the ear accommodating cavity 412. It can be understood that during the actual connection process, the tabs 211 of the two tab groups 210 can pass through the first tab perforation 411 and extend into the ear accommodating cavity 412 to achieve connection. When the two tab groups 210 are connected in series, the connection area of the two tabs 211 is located inside the ear accommodating cavity 412, and the ear accommodating cavity 412 is closed by the plug cover 420. It is equivalent that the connection area of the two tabs 211 is in a relatively enclosed space, which plays a good role in protecting the connection area of the tabs 211 and avoiding the occurrence of phenomena such as tab 211 bending, being crushed, or having poor connection. In addition, after assembly, the tab holder 400 can also play a supporting role, thereby ensuring that the two tab groups 210 can be stably maintained inside the housing 100 and reducing the probability of tab 211 bending.

[0051] Optionally, a limiting groove 311 is provided on the side wall of the tab group holder 300, and the end of the holder body 410 is clamped in the limiting groove 311. It can be understood that the connection between the holder body 410 and the tab group holder 300 is realized by the clamping of the limiting groove 311 and the holder body 410. This connection method is convenient for installing and disassembling the tab holder 400 on the one hand, and is beneficial to ensuring the connection stability of the tab holder 400 on the other hand. Optionally, the thickness of the part of the holder body 410 inserted into the limiting groove 311 is L, and L satisfies the relationship: 0.8 mm < L < 2 mm. Of course, the size of the holder body 410 can also be selected according to actual needs. It should be added that in other embodiments of the present invention, the holder body 410 can be directly bonded or connected to the tab group holder 300 through connecting parts such as screws, and is not limited to the aforementioned clamping structure.

[0052] Optionally, referring to Figures 10-11 As shown in the figure, the plug cover 420 has a stopping portion 421 and an inserting portion 422. The inserting portion 422 is inserted into the ear accommodating cavity 412, and the stopping portion 421 stops against the holder body 410. It can be understood that the connection between the plug cover 420 and the holder body 410 is realized by setting the stopping portion 421 and the inserting portion 422, which can increase the contact area between the plug cover 420 and the holder body 410, thereby enhancing the connection strength between the plug cover 420 and the holder body 410. Optionally, the total thickness H of the plug cover 420 satisfies the relationship: 2 mm < H < 4 mm, and the thickness T of the stopping portion 421 satisfies the relationship: 0.5 mm < T < 2 mm. Of course, the size of the plug cover 420 can also be selected according to actual needs.

[0053] The battery cell of this embodiment has the following advantages:

[0054] First: The integral electrode group inside the battery cell in the prior art is designed as a split electrode group unit 200 formed by connecting multiple electrode groups 210 in series, shortening the length of a single electrode group 210 and reducing defects such as wrinkles, deformation, layer displacement, and fracture caused by the large length of the electrode sheets of the electrode group 210, which is beneficial to improving the working reliability of the battery cell.

[0055] Second: The tabs 211 of two adjacent electrode groups 210 in the electrode group unit 200 are welded to achieve the series connection of the two electrode groups 210. An installation groove 212 is designed at the end of the electrode group 210, and the tabs 211 of the two electrode groups 210 are connected inside the installation groove 212. And an ear support 400 for supporting the tab 211 is provided. The ear support 400 is provided with a first tab through-hole 411 for the tab 211 to pass through. When splicing on both sides, the two electrode groups 210 are exactly fixed completely. On the one hand, it plays a role in balancing and fixing and protecting the connection position of the tab 211. On the other hand, it is convenient for installation and disassembly, and ensures the thrust balance when the electrode group 210 enters the shell, insulating and isolating the two electrode groups 210. The tabs 211 of two adjacent electrode groups 210 adopt a horizontal welding method, simplifying the manufacturing process, reducing the internal resistance between the two tabs 211, and saving the connection length of the two tabs 211, which is beneficial to reducing the total length of the battery cell and facilitating the miniaturization design of the battery cell.

[0056] Third: The two end plates 500 adopt a smooth plate structure with protruding parts 510, canceling other parts such as pole columns and plastic parts, with a high space utilization rate, which is beneficial to reducing the total length of the battery cell and facilitating the miniaturization design of the battery cell.

[0057] Fourth: An electrode group support 300 is arranged around the electrode group 210. The electrode group support 300 adopts an integral design and can be formed by a mature process (injection molding), reducing the number of parts, simplifying the assembly process, and at the same time ensuring that a circular exhaust channel can be formed, facilitating pressure relief when the battery cell has a thermal runaway.

[0058] Fifth: An insulating film 600 is arranged between the outer shell 100 and the electrode group 210. The insulating film 600 can achieve the overall wrapping of the electrode group unit 200, improving the insulation protection ability of the battery cell.

[0059] Sixth: A second explosion-proof valve 800 can be installed on the two end plates 500, and the end plates 500 are directly connected to the positive and negative electrodes of the electrode group unit 200, reducing the number of structural parts, realizing the functions of cost reduction and internal resistance reduction of the battery cell. An exhaust channel can also be formed between the two end plates 500. Due to the existence of the first tab through-hole 411, the exhaust channel is unobstructed, increasing the exhaust efficiency and shortening the airway travel, thereby improving the safety of the battery cell.

[0060] In the description of this specification, the descriptions referring to the terms "some embodiments", "other embodiments", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0061] Obviously, the above embodiments of the present utility model are merely examples given 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 in the protection scope of the claims of the present utility model.

Claims

1. A battery cell, characterized in that, Comprising: A housing (100) with both ends thereof open. A pole group bracket (300) installed inside the housing (100). A pole group unit (200) installed on the pole group bracket (300), and the pole group unit (200) includes at least two serially connected pole groups (210), and pole tabs (211) are provided at both ends of each pole group (210). A pole tab bracket (400) connected to the pole group bracket (300) and located between two adjacent pole groups (210), and a first pole tab perforation (411) for the pole tab (211) to pass through is provided on the pole tab bracket (400). Two end plates (500) respectively installed at both ends of the pole group bracket (300) and capable of closing the open ends of the housing (100), and the two end plates (500) are respectively electrically connected to the positive and negative electrodes of the pole group unit (200).

2. The battery cell according to claim 1, characterized in that Each end of each pole group (210) has a mounting groove (212), the pole tab (211) is located in the mounting groove (212), and among two adjacent pole groups (210), the pole tab (211) of one pole group (210) can extend into the mounting groove (212) of the other pole group (210) and be welded to the pole tab (211) of this pole group (210).

3. The battery cell according to claim 1, characterized in that, The pole tab bracket (400) includes: A bracket body (410) with both ends thereof respectively connected to the pole group bracket (300), a pole tab receiving cavity (412) is provided on the bracket body (410), at least one end of the pole tab receiving cavity (412) is open, and the first pole tab perforation (411) is provided on the side wall of the pole tab receiving cavity (412). A plug cover (420) connected to the bracket body (410) and used to block the open end of the pole tab receiving cavity (412).

4. The battery cell according to claim 3, wherein, A limiting groove (311) is provided on the side wall of the pole group bracket (300), and the end of the bracket body (410) is clamped in the limiting groove (311); and / or: The plug cover (420) has a stopping portion (421) and an inserting portion (422), the inserting portion (422) is inserted into the pole tab receiving cavity (412), and the stopping portion (421) stops against the bracket body (410).

5. The battery cell according to any one of claims 1-4, characterized in that, The housing (100) includes two first side walls (110) and two second side walls (120), the area of the first side wall (110) is smaller than the area of the second side wall (120), and a first explosion-proof valve (700) is provided on the first side wall (110); the pole group bracket (300) has a first support plate (310) facing the first side wall (110), the first support plate (310) stops against the side wall of the pole group (210), and an air flow channel is defined between the first support plate (310) and the first side wall (110).

6. The cell according to claim 5, wherein, A plurality of anti-abutment protrusions (312) are provided on the first support plate (310), and the plurality of anti-abutment protrusions (312) are arranged at intervals along the length direction of the pole group bracket (300), and the anti-abutment protrusions (312) abut against the first side wall (110) of the housing (100).

7. The battery cell according to claim 5, characterized in that, The battery cell further includes an insulating film (600), the insulating film (600) is sleeved on the pole group bracket (300), and an explosion-proof notch (610) corresponding to the first explosion-proof valve (700) is provided on the insulating film (600).

8. The cell according to any one of claims 1-4, characterized in that The pole group bracket (300) includes two second support plates (320) spaced apart from the pole ear bracket (400), and the two second support plates (320) are respectively used to support the two end plates (500). A second pole ear perforation (321) is provided on each of the second support plates (320), and the positive electrode and the negative electrode of the pole group unit (200) respectively pass through the second pole ear perforation (321) and are electrically connected to the two end plates (500).

9. The battery cell according to claim 8, characterized in that, A support rib (322) and a deformation groove (323) are provided on one of the second support plates (320). The extending direction of the support rib (322) is parallel to the extending direction of the second pole ear perforation (321), and the support rib (322) abuts against the end plate (500). The extending direction of the deformation groove (323) is perpendicular to the extending direction of the second pole ear perforation (321), and the deformation groove (323) divides the end portion of the pole group bracket (300) into two parts.

10. The battery cell according to any one of claims 1-4, characterized in that, The end plate (500) is provided with a protrusion (510) and an explosion-proof valve mounting hole. The protrusion (510) is used to realize the electrical connection between the plurality of battery cells, and the explosion-proof valve mounting hole is used to mount the second explosion-proof valve (800).

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