Battery cell and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery cell and a battery pack. Wherein the battery cell comprises a shell, and a cavity is formed in the shell; the plurality of pole groups are arranged in the cavity in series and are overlapped along the length direction of the shell to form a battery cell body, and tabs are arranged at two ends of each pole group; the bracket assembly is arranged in the cavity and is annularly wound on the peripheral side of the battery cell body; and the tab mounting part is positioned between two adjacent pole groups, the tab mounting part comprises a main body part and a limiting part, the main body part is connected with the pair of bracket assemblies, the limiting part extends along the height direction of the shell and forms a step surface with the main body part, and the tab between the two adjacent pole groups is arranged on the step surface. Compared with the mode that a long-size pole group matched with the size of the battery cell is arranged in the shell, the mode that a plurality of pole groups connected in series are arranged in the shell can increase the energy stored by the battery cell, meanwhile, the length of each pole group in the shell is shortened, the production and preparation difficulty of the pole groups is reduced, and the production yield is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery core and a battery pack. Background Art

[0002] With the continuous development of battery technology, the demand for large-capacity batteries in battery-related applications is also increasing. Since the capacity of a battery is related to the size of the battery cell, the use and development of long-size battery cells to increase the capacity of the battery is gaining more and more attention.

[0003] However, as battery cell length increases, the manufacturing process becomes more complex and the process requirements become more stringent. Furthermore, compared to shorter batteries, longer cells also present strength issues, making them more susceptible to bending and deformation during use. Utility Model Content

[0004] In view of this, the present invention provides a battery cell and a battery pack to solve the problems in the related art that long-sized battery cells are difficult to manufacture and have poor strength.

[0005] In a first aspect, the present invention provides a battery cell, comprising:

[0006] a shell having a cavity therein;

[0007] A plurality of electrode groups are arranged in series in the cavity and stacked along the length direction of the shell to form a battery cell body, and pole ears are provided at both ends of the electrode group;

[0008] A bracket assembly is disposed in the cavity and is arranged around the periphery of the battery cell body;

[0009] The pole tab mounting portion is located between two adjacent pole groups. The pole tab mounting portion includes a main body and a limiting portion. The main body is connected to the bracket assembly. The limiting portion extends along the height direction of the shell and forms a step surface with the main body. The pole tab between two adjacent pole groups is arranged on the step surface.

[0010] Beneficial effects: Compared with setting a long-sized pole group that matches the size of the battery cell in the shell, setting a plurality of pole groups connected in series in the shell can increase the energy storage of the battery cell itself while shortening the length of each pole group in the shell, reducing the difficulty of producing and preparing the pole group, and improving the yield rate of production. Secondly, since the utility model shortens the length of a single pole group, the deformation resistance of each pole group in the battery cell body will be enhanced to a certain extent compared with a single long-sized pole group, thereby reducing the probability of bending and deformation of the battery cell. Providing a bracket assembly on the peripheral side of the battery cell body allows the formation of multiple pole groups as a whole, avoiding relative movement of adjacent pole groups during the use of the battery cell and damaging the battery cell body. In addition, providing a pole ear mounting portion between two adjacent pole groups allows multiple pole groups to be spaced apart in the shell. In this way, when the battery cell experiences thermal runaway, the gas inside the shell can quickly leave the shell through the gap between adjacent pole groups, ensuring the safety performance of the battery cell. Furthermore, by providing a stepped surface for placing the tabs on the tab mounting portion, an operating platform is provided for the operator to connect the tabs of two adjacent pole groups together, which reduces the difficulty of the connection operation. On the other hand, the position of the connected tabs can be fixed to improve the connection stability.

[0011] In an optional embodiment, the bracket assembly includes a pair of side plates and a pair of support plates, wherein the pair of side plates are respectively located on opposite sides of the battery cell body along the width direction of the shell; the pair of support plates are respectively located at both ends of the battery cell body and form a ring with the pair of side plates.

[0012] Beneficial effect: By arranging a pair of side plates on opposite sides of the battery cell body along the width direction of the shell, and arranging a pair of support plates at both ends of the battery cell body, the bracket assembly can form a stable frame structure around the battery cell body, thereby improving the stability of the entire battery cell body.

[0013] In an optional embodiment, the side panel includes a side panel body and a bent portion bent from the end of the side panel body toward the side where the battery cell body is located. A notch is provided on the support plate, and the bent portion passes through the notch through the side panel body and is clamped with the side of the support plate away from the battery cell body.

[0014] Beneficial Effect: The bent portion snaps into place with the notch on the support plate, creating a removable connection between the side panel and the support plate. This connection method not only simplifies the assembly of the bracket assembly around the battery cell body, but also reduces the difficulty of subsequent disassembly of the bracket assembly and repair of the battery cell body.

[0015] In an optional embodiment, the side plate includes a first baffle and a second baffle alternately connected, along the thickness direction of the shell, the size of the first baffle is smaller than the size of the second baffle, and the first baffle is connected to the support plate.

[0016] Beneficial effects: Since the battery cell of the present invention is provided with multiple pole groups, a large amount of high-pressure gas will be generated in the shell when the battery cell experiences thermal runaway. In order to allow this part of the high-pressure gas to escape from the shell in a short period of time, the present invention makes the size of the first baffle smaller than the size of the second baffle, thereby reducing obstacles on the gas flow path and ensuring that the gas inside the shell can flow to the external environment at a faster speed. Secondly, the first baffle and the second baffle are arranged in alternating connection, which can still ensure the contact area between the side plate and the multiple pole groups, and ensure the lateral support effect of the side plate on the battery cell body.

[0017] In an optional embodiment, a pair of the tab mounting portions are provided between two adjacent pole groups, one end of the pair of tab mounting portions is respectively connected to a pair of the side plates, and the other ends of the pair of tab mounting portions are abutted against each other.

[0018] Beneficial Effects: Since a pair of tabs can be provided at one end of a pole group, providing a pair of tab mounting portions between two adjacent pole groups allows the connected pair of tabs to be fixed to different stepped surfaces. This not only optimizes the structural layout within the housing but also avoids unnecessary contact between the connected pair of tabs. Furthermore, to ensure the continuity of electrolyte flow between multiple pole groups, the pair of tab mounting portions are abutted against one end of the pair of side plates, allowing the electrolyte to pass through the gap between them, reducing the impact of the tab mounting portions on electrolyte flow.

[0019] In an optional embodiment, a pair of the tab mounting portions are provided with through holes extending along the width direction of the shell.

[0020] Beneficial Effects: Providing through-holes within the tab mounting area increases the flow path for gas and electrolyte within the housing. This not only allows for quick discharge of gas from the battery cell, reducing the risk of internal pressure buildup, but also allows for quick completion of liquid injection into multiple electrode groups, reducing the difficulty of injection.

[0021] In an optional embodiment, both ends of the shell are further provided with openings connected to the cavity and a cover plate sealing the opening, the support plate is provided with an avoidance hole, and the pole ears at both ends of the battery cell body are welded to the corresponding cover plates through the corresponding avoidance holes; the side of the cover plate facing away from the battery cell body is provided with a protrusion extending along the length direction of the shell.

[0022] Beneficial effects: By providing an opening on the shell that is connected to its cavity, it is convenient for operators to assemble the electrode group and other related structures into the shell, thereby improving the convenience of assembly. Furthermore, the cover plate is used to seal the opening, thereby ensuring the sealing of the battery cell, reducing the possibility of external moisture, dust and other impurities entering the interior of the battery cell, ensuring the cleanliness and stability of the internal environment of the battery cell, and thus helping to extend the service life of the battery cell. In addition, by directly welding the pole ear of the battery cell body to the cover plate, the structure of the cover plate can be simplified, reducing its occupation of the internal space of the shell, and reducing the production cost of the cover plate. Furthermore, by providing a protrusion on the cover plate, it is convenient for operators to connect the battery cell with external equipment to realize the input or output of electrical energy.

[0023] In an optional embodiment, the outer sides of the battery cell body and the bracket assembly are wrapped with an insulating film.

[0024] Beneficial Effects: Since the cell shell is typically made of a conductive metal material, wrapping the insulating film around the cell body and the outside of the support assembly to ensure the safety of the cell during subsequent use can effectively prevent short circuits between the cell body and the shell during use. Furthermore, wrapping the insulating film around the outside of the cell body and the support assembly can improve the integrity of the cell body and the support assembly, thereby preventing wear or damage caused by relative movement of adjacent pole groups while also ensuring that the support assembly effectively supports and secures the cell body.

[0025] In an optional embodiment, the shell is provided with explosion-proof valves on two opposite sides along the width thereof, and the insulating film is provided with slits corresponding to the positions of the explosion-proof valves.

[0026] Beneficial Effect: By providing a slit in the insulating film corresponding to the location of the explosion-proof valve, gas inside the battery cell can easily break through the insulation film at this point, and the pressure inside the battery cell can be released through the explosion-proof valve on the shell. In addition, compared to completely removing the material at the location where the insulating film corresponds to the explosion-proof valve, providing a slit in this location not only ensures the insulation protection capability of the battery cell, but also does not interfere with the pressure release process of the battery cell.

[0027] In a second aspect, the present invention further provides a battery pack comprising: a plurality of the above-mentioned battery cells.

[0028] Beneficial effects: Since each of the above-mentioned battery cells includes multiple electrode groups, the battery pack composed of multiple battery cells can also store more energy. Furthermore, since the bracket assembly is provided on the peripheral side of the battery body in each battery cell, the battery pack of the present invention has better safety and reliability during use. In addition, compared with increasing the energy storage capacity of the battery pack by connecting more battery cells in series, the present invention increases the energy storage capacity of a single battery cell itself without changing the number of battery cells, which can effectively reduce the volume of the battery pack and reduce the battery pack's requirements for installation space. In addition, the battery pack of the present invention has all the advantages of the above-mentioned battery cells, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific implementation methods of the utility model 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 This is a schematic structural diagram of a battery cell according to an embodiment of the present utility model;

[0031] Figure 2 for Figure 1 A schematic structural diagram of the battery cell from another perspective is shown;

[0032] Figure 3 This is a partial structural diagram of a battery cell according to an embodiment of the present utility model;

[0033] Figure 4 This is a schematic diagram of the assembly of a side plate and a tab mounting portion according to an embodiment of the present utility model;

[0034] Figure 5 This is a structural schematic diagram of a support plate according to an embodiment of the present utility model;

[0035] Figure 6 This is a structural schematic diagram of a cover plate according to an embodiment of the present utility model;

[0036] Figure 7 This is a schematic structural diagram of an insulating film according to an embodiment of the present utility model;

[0037] Figure 8 for Figure 7 A schematic structural diagram of the insulating film from another perspective is shown.

[0038] Description of reference numerals:

[0039] 1. Shell; 101. Explosion-proof valve; 2. Pole group; 201. Pole ear; 3. Bracket assembly; 301. Side panel; 3011. Side panel body; 3012. Bending portion; 3013. First baffle; 3014. Second baffle; 302. Support plate; 3021. Notch; 3022. Avoidance hole; 4. Pole ear mounting portion; 401. Main body; 402. Limiting portion; 403. Step surface; 404. Through hole; 5. Insulating film; 501. Slit; 6. Cover plate; 601. Raised portion. DETAILED DESCRIPTION

[0040] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0041] In view of the problems in related technologies that long-sized battery cells are difficult to manufacture and have poor strength, the present utility model provides a battery cell and a battery pack.

[0042] The following combination Figures 1 to 8 , describing the embodiments of the present utility model.

[0043] According to an embodiment of the present invention, on the one hand, a battery cell is provided, such as Figures 1 to 4 As shown, it includes: a shell 1, multiple pole groups 2, a bracket assembly 3 and a pole tab mounting portion 4.

[0044] Specifically, a cavity is provided inside the shell 1; multiple pole groups 2 are arranged in series in the cavity and stacked along the length direction of the shell 1 to form a battery cell body, and pole ears 201 are provided at both ends of the pole group 2; the bracket assembly 3 is arranged in the cavity and is arranged around the circumference of the battery cell body; the pole ear mounting portion 4 is located between two adjacent pole groups 2, and the pole ear mounting portion 4 includes a main body 401 and a limiting portion 402, the main body 401 is connected to the bracket assembly 3, and the limiting portion 402 extends along the height direction of the shell 1 and forms a step surface 403 with the main body 401, and the pole ear 201 between two adjacent pole groups 2 is arranged on the step surface 403.

[0045] Compared to installing a long electrode group 2 within the housing 1 that matches the size of the battery cell, installing multiple electrode groups 2 connected in series within the housing 1 can increase the energy storage capacity of the battery cell while shortening the length of each electrode group 2 within the housing 1, reducing the difficulty of manufacturing the electrode groups 2 and improving the production yield rate. Secondly, because the length of a single electrode group 2 is shortened in this embodiment, the deformation resistance of each electrode group 2 within the battery cell body is also enhanced compared to a single long electrode group 2, thereby reducing the probability of the battery cell bending and deformation.

[0046] Furthermore, since the battery cell body in this embodiment includes multiple individual electrode groups 2, a bracket assembly 3 is provided around the periphery of the battery cell body to allow the multiple electrode groups 2 to form a single unit, preventing relative movement of adjacent electrode groups 2 during use and potentially damaging the battery cell body. Specifically, the shape of the bracket assembly 3 matches the shape of the battery cell body, and the inner wall of the bracket assembly 3 conforms to the periphery of the battery cell body.

[0047] Furthermore, by providing a tab mounting portion 4 between two adjacent pole groups 2, multiple pole groups 2 can be spaced apart in the shell 1. In this way, when the battery cell experiences thermal runaway, the gas inside the shell 1 can quickly leave the shell 1 through the gap between the adjacent pole groups 2, thereby ensuring the safety performance of the battery cell. Furthermore, by providing a step surface 403 for placing the tab 201 on the tab mounting portion 4, an operating platform is provided for the operator to connect the tabs 201 of two adjacent pole groups 2 together, thereby reducing the difficulty of the connection operation. On the other hand, the position of the connected tab 201 can be fixed to improve the connection stability. It is understandable that in order to better fix each pole group 2 in the battery cell body, the tab mounting portion 4 can be abutted against the adjacent pole group 2, that is, the tab mounting portion 4 and the bracket assembly 3 are surrounded by a limiting structure that is adapted to the shape of a single pole group 2.

[0048] It should be noted that the length direction of the housing 1 in this embodiment is Figures 1 to 3 The direction shown in is consistent.

[0049] According to one embodiment of the present invention, Figure 3 As shown, the bracket assembly 3 includes a pair of side plates 301 and a pair of support plates 302. The side plates 301 are located on opposite sides of the cell body along the width of the housing 1. The support plates 302 are located at both ends of the cell body and form a ring with the side plates 301. It is understood that arranging the side plates 301 on opposite sides of the cell body along the width of the housing 1 and the support plates 302 at both ends of the cell body allows the bracket assembly 3 to form a stable frame structure around the cell body, thereby improving the stability of the entire cell body.

[0050] It should be noted that the connection between the pair of side panels 301 and the pair of support panels 302 can be either a fixed connection or a detachable connection, as long as the bracket assembly 3 can form a stable annular structure. For example, in one specific embodiment, the side panels 301 include a side panel body 3011 and a bent portion 3012 bent from the end of the side panel body 3011 toward the side where the battery cell body is located. The support panel 302 is provided with a notch 3021. The bent portion 3012 passes through the notch 3021 through the side panel body 3011 and engages with the side of the support panel 302 away from the battery cell body. This connection method not only simplifies the steps of assembling the bracket assembly 3 on the side of the battery cell body, but also reduces the difficulty of subsequently disassembling the bracket assembly 3 and repairing the battery cell body.

[0051] It should be noted that in this embodiment, the width direction of the housing 1 is Figure 1 and Figure 3 The directions shown are consistent.

[0052] Since the battery cell of this embodiment is provided with multiple electrode groups 2, when the battery cell experiences thermal runaway, a large amount of high-pressure gas will be generated in the housing 1. In order to allow this part of the high-pressure gas to be discharged from the housing 1 in a short time, in a specific embodiment, as shown in FIG. Figure 3 and Figure 4 As shown, the side plate 301 includes alternating first and second baffles 3013 and 3014. Along the thickness direction of the housing 1, the first baffles 3013 are smaller than the second baffles 3014. The first baffles 3013 are connected to the support plate 302. Furthermore, in this embodiment, the alternating arrangement of the first and second baffles 3013 and 3014 ensures sufficient contact area between the side plate 301 and the multiple electrode groups 2, ensuring the lateral support provided by the side plate 301 to the battery cell body.

[0053] It should be noted that in this embodiment, the thickness direction of the shell 1 is Figure 2 The directions shown are consistent.

[0054] According to one embodiment of the present invention, Figure 3 and Figure 4As shown, a pair of tab mounting portions 4 are provided between two adjacent pole groups 2, one end of the pair of tab mounting portions 4 is respectively connected to a pair of side plates 301, and the other ends of the pair of tab mounting portions 4 are abutted. Since a pair of tabs 201 can be provided at one end of a pole group 2, a pair of tab mounting portions 4 is provided between two adjacent pole groups 2, so that the connected pair of tabs 201 can be fixed on different step surfaces 403 respectively. In this way, not only can the structural layout inside the housing 1 be optimized, but also unnecessary contact between the connected pair of tabs 201 can be avoided. In addition, in order to ensure the flow continuity of the electrolyte between multiple pole groups 2, the pair of tab mounting portions 4 are abutted away from one end of the pair of side plates 301, so that the electrolyte can pass through the gap between the two, reducing the influence of the tab mounting portion 4 on the flow of the electrolyte.

[0055] It should be noted that the tab mounting portion 4 can be attached to the side panel 301 by gluing, snapping, or other methods, as long as a stable connection between the two is ensured. This is not specifically limited in the present invention. For example, in one embodiment, the tab mounting portion 4 and the corresponding side panel 301 are injection molded. This reduces the number of connectors used and simplifies the assembly process.

[0056] To reduce the internal space of the housing 1 occupied by the tabs 201 of two adjacent electrode groups 2 when connected, the tabs 201 of the two adjacent electrode groups 2 can be placed on the stepped surface 403 in an overlapping manner, and then connected together by horizontal welding. Compared to connecting the tabs 201 using a C-shaped or S-shaped bend, using this method to connect the tabs 201 of two adjacent electrode groups 2 not only simplifies the process but also reduces the internal resistance at the connection.

[0057] According to one embodiment of the present invention, Figure 4 As shown, a pair of tab mounting portions 4 are provided with through-holes 404 extending along the width of the housing 1. Providing through-holes 404 within the tab mounting portions 4 increases the flow paths of gas and electrolyte within the housing 1. This not only allows for quick discharge of gas from the battery cells, reducing the risk of internal pressure buildup, but also allows for quick completion of the injection process for multiple electrode groups 2, reducing the difficulty of injection.

[0058] According to one embodiment of the present invention, Figure 3 、 Figure 5 and Figure 6As shown, both ends of the housing 1 are provided with openings communicating with the cavity and cover plates 6 that seal the openings. The support plate 302 is provided with escape holes 3022, through which the tabs 201 at each end of the cell body are welded to the corresponding cover plates 6. The side of the cover plate 6 facing away from the cell body is provided with a raised portion 601 extending along the length of the housing 1. Providing openings in the housing 1 that communicate with its cavity facilitates assembly of the electrode assembly 2 and other related structures into the housing 1, improving assembly convenience. Furthermore, using the cover plate 6 to seal the openings ensures the cell's tightness, reduces the possibility of external impurities such as moisture and dust entering the cell, and ensures a clean and stable internal environment, thereby extending the cell's service life. Furthermore, directly welding the tabs 201 of the cell body to the cover plate 6 simplifies its structure, reduces its internal space occupation within the housing 1, and reduces the production cost of the cover plate 6. Furthermore, by providing the protrusion 601 on the cover plate 6 , it is convenient for operators to connect the battery cell with external equipment to realize the input or output of electric energy.

[0059] It should be noted that the support plate 302 between the cover plate 6 and the battery cell body is made of an insulating material, thereby preventing short circuits. Furthermore, to reduce the space occupied by the support plate 302 within the housing 1 while ensuring that the support plate 302 secures the battery cell body, in one embodiment, the thickness of the support plate 302 is greater than or equal to 1 mm and less than or equal to 0.3 mm.

[0060] According to one embodiment of the present invention, Figure 7 and Figure 8 As shown, the outer sides of the battery cell body and the support assembly 3 are wrapped with an insulating film 5. Since the shell 1 of the battery cell is usually made of a metal conductive material, in order to ensure the safety of the subsequent use of the battery cell, the insulating film 5 is wrapped around the outer sides of the battery cell body and the support assembly 3. This can effectively prevent the occurrence of short circuits between the battery cell body and the shell 1 during the use of the battery cell. In addition, wrapping the insulating film 5 around the outer sides of the battery cell body and the support assembly 3 can also improve the integrity of the battery cell body and the support assembly 3. In this way, not only can the wear or damage caused by the relative movement of adjacent electrode groups 2 be avoided, but the support and fixation effect of the support assembly 3 on the battery cell body can also be ensured.

[0061] It is understandable that in order to ensure that the insulating film 5 can insulate the battery body without affecting the discharge of gas inside the battery body, in one embodiment, the thickness of the insulating film 5 is greater than 0.1 mm and less than 0.3 mm.

[0062] According to one embodiment of the present invention, Figure 2As shown, the housing 1 is provided with explosion-proof valves 101 on opposite sides along its width, and the insulating film 5 is provided with slits 501 corresponding to the locations of the explosion-proof valves 101. Providing slits 501 in the insulating film 5 corresponding to the locations of the explosion-proof valves 101 facilitates the passage of gas within the battery cell through the protective barrier of the insulating film 5 at this location, allowing the pressure within the battery cell to be released through the explosion-proof valves 101 on the housing 1. Furthermore, compared to completely removing material from the insulating film 5 at the location corresponding to the explosion-proof valves 101, providing slits 501 in this location not only ensures the insulation protection capabilities of the battery cell, but also prevents interference with the pressure release process of the battery cell.

[0063] It is understood that the function of the explosion-proof valve 101 is to promptly expel the gas inside the battery cell when thermal runaway occurs. Therefore, the shape and position of the explosion-proof valve 101 in this embodiment can be adaptively adjusted as needed. For example, in a specific embodiment, the shell 1 is provided with explosion-proof valves 101 on opposite sides along its width direction. Compared with setting the explosion-proof valve 101 on the side of the shell 1 in the length direction, the side dimensions of the shell 1 in the width direction are relatively small and have better strength. Therefore, setting the explosion-proof valve 101 on the side of the shell 1 in the width direction can reduce the impact on the shape of the shell 1 itself.

[0064] Furthermore, to prevent the explosion-proof valve 101 from being scratched, a protective film can be installed on the inner wall of the housing 1 at a location corresponding to the explosion-proof valve 101. The protective film can be made of, but is not limited to, PE, PP, and PET. It is understood that to prevent the protective film from interfering with the exhaust of the battery cell, a slit 501 can also be provided in the protective film.

[0065] According to an embodiment of the present invention, on the other hand, a battery pack is provided, comprising: a plurality of the above-mentioned battery cells.

[0066] Since each of the above-mentioned battery cells includes multiple electrode groups 2, the battery pack composed of multiple battery cells can also store more energy. Furthermore, since the bracket assembly 3 is provided on the peripheral side of the battery body in each battery cell, the battery pack of the present invention has better safety and reliability during use. In addition, compared with increasing the energy storage capacity of the battery pack by connecting more battery cells in series, the present invention increases the energy storage capacity of a single battery cell itself without changing the number of battery cells, which can effectively reduce the volume of the battery pack and reduce the battery pack's requirements for installation space. In addition, the battery pack of the present invention has all the advantages of the above-mentioned battery cells, which will not be repeated here.

[0067] It should be noted that the battery cells in this embodiment may be, but are not limited to, lithium-ion batteries, lithium manganese oxide batteries, and nickel-cobalt-manganese ternary materials batteries. Specifically, taking lithium-ion batteries as an example, the battery pack in this embodiment may be composed of multiple lithium-ion batteries connected in series, multiple lithium-ion batteries connected in parallel, or multiple lithium-ion batteries combined in series and parallel. The specific configuration may be adjusted based on actual application scenarios and needs, and this is not specifically limited by this utility model.

[0068] In addition, to achieve the basic functions of the battery pack, the battery pack in this embodiment may also include other necessary modules or components, such as a battery management system, a heat dissipation system, etc. It should be noted that the other necessary modules or components included in the battery pack can be of any suitable existing structure. In order to clearly and briefly illustrate the technical solution provided by this embodiment, the above-mentioned part will not be repeated here, and the drawings in the specification have also been simplified accordingly. However, it should be understood that the scope of the present invention is not limited by this.

[0069] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. A battery cell, characterized in that: include: a shell having a cavity therein; A plurality of electrode groups are arranged in series in the cavity and stacked along the length direction of the shell to form a battery cell body, and pole ears are provided at both ends of the electrode group; A bracket assembly is disposed in the cavity and is arranged around the periphery of the battery cell body; The pole tab mounting portion is located between two adjacent pole groups. The pole tab mounting portion includes a main body and a limiting portion. The main body is connected to the bracket assembly. The limiting portion extends along the height direction of the shell and forms a step surface with the main body. The pole tab between two adjacent pole groups is arranged on the step surface.

2. The battery cell according to claim 1, characterized in that The bracket assembly includes a pair of side plates and a pair of support plates. The pair of side plates are respectively located on opposite sides of the battery cell body along the width direction of the shell; the pair of support plates are respectively located at both ends of the battery cell body and form a ring with the pair of side plates.

3. The battery cell according to claim 2, characterized in that The side panel includes a side panel body and a bent portion bent from the end of the side panel body toward the side where the battery cell body is located. A notch is provided on the support plate. The bent portion passes through the notch through the side panel body and is clamped with the side of the support plate away from the battery cell body.

4. The battery cell according to claim 2, characterized in that The side plate includes a first baffle and a second baffle that are alternately connected. Along the thickness direction of the shell, the size of the first baffle is smaller than that of the second baffle. The first baffle is connected to the support plate.

5. The battery cell according to claim 2, characterized in that A pair of tab mounting portions are provided between two adjacent pole groups. One ends of the pair of tab mounting portions are respectively connected to a pair of side plates, and the other ends of the pair of tab mounting portions are in contact with each other.

6. The battery cell according to claim 5, characterized in that A pair of tab mounting portions are provided with through holes extending along the width direction of the housing.

7. The battery cell according to claim 2, characterized in that Both ends of the shell are also provided with openings connected to the cavity and a cover plate for sealing the openings. The support plate is provided with an avoidance hole, and the pole ears at both ends of the battery body are welded to the corresponding cover plates through the corresponding avoidance holes; the side of the cover plate facing away from the battery body is provided with a protrusion extending along the length direction of the shell.

8. The battery cell according to any one of claims 1 to 7, characterized in that: The outer sides of the battery cell body and the bracket assembly are wrapped with an insulating film.

9. The battery cell according to claim 8, characterized in that The shell is provided with explosion-proof valves on two opposite sides along the width thereof, and the insulating film is provided with slits corresponding to the positions of the explosion-proof valves.

10. A battery pack, characterized in that: include: A plurality of battery cells according to any one of claims 1 to 9.

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