Battery cell, battery and electric device

Abstract

The application relates to the battery technical field and discloses a battery cell, a battery and an electric device, which comprise a shell, at least two bare battery cells and a pole assembly. The material of the shell is a conductive material. At least one partition plate is arranged in the inner cavity of the shell. The inner cavity of the shell is divided into at least two containing cavities by the partition plate. Each bare battery cell is one-to-one correspondingly arranged in each containing cavity. Each bare battery cell has first and second polar tabs with opposite polarities. The first polar tab of each bare battery cell is connected with the shell. The first end of the pole assembly penetrates into the shell and is connected with the second polar tab of each bare battery cell. The second end of the pole assembly is adapted to be connected with a protection circuit board. The battery cell, the battery and the electric device disclosed by the application solve or improve the problem that the energy density of a single battery cell is low and higher electric energy cannot be output.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to battery cells, batteries, and electrical devices. Background Technology

[0002] With the rapid development of communication devices such as smartphones, smartwatches, and tablets, the demand for high-performance battery modules is increasing. As the energy source for these devices, the design and energy density of battery modules are crucial for improving overall performance.

[0003] A battery module comprises multiple independent cells. Manufacturing a high-capacity battery module requires increasing the number of cells and improving the energy density of each cell. Related technologies use a method of connecting multiple independent cells to form a high-capacity battery module. However, each cell consists of a bare cell and a protective shell surrounding it. Connecting multiple independent cells to form a battery module results in the protective shell having a certain thickness, occupying the space between adjacent bare cells. This limits the number of cells that can be accommodated within a limited space, and since each module only contains one bare cell, it cannot output more electrical energy. Utility Model Content

[0004] In view of this, this application provides battery cells, batteries and electrical devices to solve or improve the problem of low energy density of individual battery cells, which prevents them from outputting higher electrical energy.

[0005] In a first aspect, this application provides a battery cell, comprising:

[0006] The housing is made of a conductive material. The inner cavity of the housing is provided with at least one partition, which divides the inner cavity of the housing into at least two receiving cavities. The housing is provided with a connecting hole for each of the receiving cavities.

[0007] At least two bare battery cells are installed in each of the receiving cavities in a one-to-one correspondence. Each bare battery cell has a first tab and a second tab with opposite polarities. The first tab of each bare battery cell is connected to the housing.

[0008] The electrode assembly has a first end that passes through the connecting hole into the housing and is connected to the second tab of each bare cell. The second end of the electrode assembly is adapted to connect to a protection circuit board.

[0009] In this embodiment, at least one partition is provided inside the housing, dividing the inner cavity of the housing into at least two receiving cavities. Each receiving cavity houses a bare battery cell, thereby improving the overall energy density of the battery cell. In related technologies, each bare battery cell is individually housed within a protective shell. In terms of space occupancy, the distance between two adjacent bare battery cells arranged along the width direction of the protective shell is equivalent to the wall thickness of two protective shells, resulting in a large space occupation. This application, by providing a partition inside the housing and forming multiple receiving cavities, can reduce the space occupied in the width direction of the protective shell while increasing the number of bare battery cells installed, thereby increasing the energy density of the battery cell. The housing is connected to the first tab of each bare battery cell, and the electrode assembly is connected to the second tab of each bare battery cell. The second end of the electrode assembly is adapted to connect to a protective circuit board.

[0010] In one optional embodiment, the electrode assembly includes a first electrode, the first electrode being provided with a first connecting post, the first end of the first connecting post passing through the communicating hole and connected to the second tab of the bare battery cell in the corresponding receiving cavity, the second end of the first connecting post being adapted to connect to a protection circuit board, and an insulating component being provided between the first connecting post and the inner wall of the communicating hole.

[0011] In one optional embodiment, the electrode assembly further includes a second electrode, which is provided with two second connecting posts. The first ends of the two second connecting posts pass through the two communicating holes and are respectively connected to the second tabs of the bare cells in the two adjacent receiving cavities. The second ends of the two second connecting posts are adapted to connect to a protection circuit board. An insulating component is provided between the second connecting posts and the inner wall of the communicating holes.

[0012] In one optional embodiment, the insulating assembly includes at least two insulating posts, each of the insulating posts being sealed and connected within each of the communicating holes, and each of the insulating posts having a through hole along its axial direction.

[0013] The first connecting post extends through the through hole; and / or, the second connecting post extends through the through hole.

[0014] In one alternative implementation, it further includes:

[0015] A conductive sheet, the first end of which is adapted to be connected to a protection circuit board, and the second end of which is connected to the second end of the electrode assembly.

[0016] In one alternative implementation, it further includes:

[0017] Insulating adhesive tape is pasted onto the outer wall of the housing.

[0018] In one alternative embodiment, an insulating fastener for securing the housing is further included, the insulating fastener being disposed on at least one side in the thickness direction of the housing.

[0019] In one optional embodiment, each of the housings is provided with a liquid injection hole corresponding to each of the receiving cavities, and each of the liquid injection holes is sealed by a sealing plug.

[0020] Secondly, this application also provides a battery, comprising:

[0021] Multiple battery cells, and the multiple battery cells are electrically connected to each other;

[0022] The protective circuit board is connected to the second end of the pole assembly.

[0023] Thirdly, this application also provides an electrical device, including: the battery. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of a battery cell according to an embodiment of this application;

[0026] Figure 2 This is a schematic diagram of a battery cell with the cover plate removed, according to an embodiment of this application.

[0027] Figure 3 for Figure 2 A magnified view of part A in the diagram;

[0028] Figure 4 This is a schematic diagram of the structure of a battery cell with the cover plate removed from another angle according to an embodiment of this application;

[0029] Figure 5 This is a schematic diagram of the circuit board structure in a battery cell according to an embodiment of this application;

[0030] Figure 6 This is a schematic diagram of the structure of the first electrode and insulation component in a battery cell according to an embodiment of this application;

[0031] Figure 7 This is a schematic diagram of the structure of the first electrode and insulation component in a battery cell according to an embodiment of this application from another angle;

[0032] Figure 8This is a schematic diagram of one form of the insulating component in a battery cell according to an embodiment of this application.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Housing; 101. Cover plate; 102. Middle frame; 103. Base plate; 2. Partition plate; 3. Receiving cavity; 4. First pole post; 401. First connecting post; 402. First conductive plate; 5. Circuit board; 501. First circuit board; 502. Molded component; 503. Second circuit board; 6. Insulating tape; 7. Injection hole; 8. Insulating fastener; 9. Conductive sheet; 901. First connecting section; 902. Second connecting section; 10. First terminal; 11. Second terminal; 12. Insulating assembly; 1201. Insulating post; 1202. Through hole; 1203. First insulating plate; 1204. Second insulating plate; X, First direction. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0036] With the rapid development of communication devices such as smartphones, smartwatches, and tablets, the demand for high-performance battery modules is increasing. As the energy source for these devices, the design and energy density of battery modules are crucial for improving overall performance.

[0037] A battery module comprises multiple independent cells. Manufacturing a high-capacity battery module requires increasing the number of cells and improving the energy density of each cell. Related technologies use a method of connecting multiple independent cells to form a high-capacity battery module. However, each cell includes a bare cell and a protective shell surrounding it. Connecting multiple independent cells to form a battery module results in the protective shell having a certain thickness, occupying the space between adjacent bare cells. This limits the number of cells that can be accommodated within a limited space, and since each cell contains only one bare cell, it cannot output more electrical energy. To solve or improve the problem of low energy density of a single cell, this application provides a cell, a battery, and an electrical device.

[0038] The following is combined Figures 1 to 8 This describes an embodiment of the present application.

[0039] According to an embodiment of this application, in one aspect, a battery cell is provided, comprising: a housing 1, at least two bare battery cells, and a terminal assembly.

[0040] Specifically, such as Figure 2 As shown, the shell 1 is made of conductive material, and the inner cavity of the shell 1 is provided with at least one partition 2. The partition 2 divides the inner cavity of the shell 1 into at least two receiving cavities 3, and the shell 1 has a connecting hole for each receiving cavity 3.

[0041] Each bare cell is installed in each receiving cavity 3 in a corresponding manner. Each bare cell has a first tab and a second tab with opposite polarities. The first tab of each bare cell is connected to the housing 1.

[0042] The first end of the electrode assembly passes through the connecting hole into the housing 1 and is connected to the second tab of each bare cell. The second end of the electrode assembly is adapted to connect to the protection circuit board 5.

[0043] In this embodiment, such as Figure 1 , Figure 2 and Figure 4 As shown, at least one partition 2 is provided inside the housing 1, which divides the inner cavity of the housing 1 into at least two receiving cavities 3. Each receiving cavity 3 contains a bare battery cell, thereby improving the overall energy density of the battery cell. In related technologies, each bare battery cell is individually housed in a protective shell. In terms of space occupation, the distance between two adjacent bare battery cells arranged along the width direction of the protective shell is the thickness of two protective shells, resulting in a large space occupation. This application, by providing a partition 2 inside the housing 1 and forming multiple receiving cavities 3, can reduce the space occupied in the width direction of the protective shell while increasing the number of bare battery cells installed, thereby increasing the energy density of the battery cell, while having the same number of bare battery cells. The housing 1 is connected to the first tab of each bare battery cell, and the electrode assembly is connected to the second tab of each bare battery cell. The second end of the electrode assembly is adapted to connect to the protection circuit board 5.

[0044] Compared to related technologies, this method avoids the problems that occur when workers install multiple battery cells, such as misalignment of the ends when aligning the first end due to dimensional tolerances in the length direction, leading to punctures in the insulation paper when applying it to the end; misalignment of multiple battery cells due to dimensional tolerances in the width direction; and increased space occupation caused by the superposition of tolerances in the placement direction when placing multiple independent battery cells.

[0045] Specifically, such as Figure 1 , Figure 2 and Figure 4 As shown, the housing 1 includes a cover plate 101, a middle frame 102 and a bottom plate 103. The cover plate 101 and the bottom plate 103 are respectively sealed to the middle frame 102. The cover plate 101 and the bottom plate 103 are sealed to the middle frame 102 by laser welding.

[0046] Specifically, the middle frame 102 and the base plate 103 are first laser welded together. Then, multiple partitions 2 are welded onto the base plate 103 and the middle frame 102 to form multiple grooves for installing bare battery cells. The bare battery cells are placed in the grooves, and the first tab of the bare battery cells is welded to the base plate 103. The cover plate 101 is welded to the middle frame 102 to seal the groove openings and form a receiving cavity 3.

[0047] Specifically, the first tab of the bare battery cell is the negative electrode, and the second tab of the bare battery cell is the positive electrode. The casing 1 is the negative electrode, and the terminal assembly is the positive electrode.

[0048] In one embodiment, the electrode assembly includes a first electrode 4, the first electrode 4 being provided with a first connecting post 401, the first end of the first connecting post 401 passing through a through hole and connected to the second tab of the bare cell in the corresponding receiving cavity 3, the second end of the first connecting post 401 being adapted to connect to a protection circuit board 5, and an insulating component 12 being provided between the first connecting post 401 and the inner wall of the through hole.

[0049] In this embodiment, the first electrode post 4 is provided with a first connecting post 401, a receiving cavity 3 corresponds to a first electrode post 4, the first connecting post 401 is connected to the second electrode post of the bare battery cell in the receiving cavity 3, multiple first electrodes post 4 together form a positive electrode, multiple first electrodes post 4 are connected to the positive terminal of the electrical device, and the housing 1 is connected to the negative terminal of the electrical device.

[0050] The insulating component 12 can prevent a short circuit between the first pole 4 and the housing 1.

[0051] In one embodiment, the electrode assembly further includes a second electrode, which is provided with two second connecting posts. The first ends of the two second connecting posts pass through two through holes and are respectively connected to the second tabs of the bare cells in two adjacent receiving cavities 3. The second ends of the two second connecting posts are adapted to connect to the protection circuit board 5. An insulating component 12 is provided between the second connecting posts and the inner wall of the through holes.

[0052] In this embodiment, the second pole is provided with two second connecting poles. Two adjacent receiving cavities 3 correspond to one second pole. The second connecting pole is connected to the second pole of the bare battery cell in the two adjacent receiving cavities 3. The second pole is the positive pole. The second pole is connected to the positive terminal of the electrical device. The housing 1 is connected to the negative terminal of the electrical device.

[0053] In one specific embodiment, a partition 2 is provided inside the housing 1 to form two receiving cavities 3. Two first pole posts 4 can be selected, and the two first connecting posts 401 of the two first pole posts 4 are respectively connected to the second pole tabs of the bare battery cells in the two receiving cavities 3.

[0054] In one specific embodiment, a partition 2 is provided inside the housing 1 to form two receiving cavities 3. A second pole can be selected, and the two second connecting posts of the second pole are respectively connected to the second tabs of the bare battery cells in the two receiving cavities 3.

[0055] In one specific embodiment, the housing 1 is provided with two partitions 2 to form three receiving cavities 3. One first post 4 and one second post can be selected to be connected to the second tab of the bare battery cell in the receiving cavity 3; or three first posts 4 can be selected to be connected to the second tab of the bare battery cell in the receiving cavity 3 respectively.

[0056] In one specific embodiment, the housing 1 is provided with multiple partitions 2 to form multiple receiving cavities 3, and different numbers of first pole posts 4 and second pole posts can be selected according to the actual situation.

[0057] In one embodiment, such as Figures 6 to 8 As shown, the insulating assembly 12 includes at least two insulating posts 1201, each insulating post 1201 is sealed and connected in each communicating hole, and each insulating post 1201 has a through hole 1202 along its axial direction.

[0058] The first connecting post 401 penetrates the through hole 1202; and / or, the second connecting post penetrates the through hole 1202.

[0059] In this embodiment, the first connecting post 401 of the first pole post 4 and the second connecting post of the second pole post are insulated from the housing 1 by being disposed in the through hole 1202 of the insulating post 1201, and the insulating post 1201 can seal the through hole.

[0060] Specifically, such as Figures 6 to 8 As shown, the insulating assembly 12 also includes a first insulating plate 1203 and a second insulating plate 1204. Both ends of the insulating post 1201 are connected to the surfaces of the first insulating plate 1203 and the second insulating plate 1204. The first insulating plate 1203 and the second insulating plate 1204 each have perforations corresponding to the through hole 1202. The first insulating plate 1203 is located outside the housing 1 and abuts against the outer wall of the housing 1. The second insulating plate 1204 is located inside the housing 1 and abuts against the inner wall of the housing 1, preventing the first pole post 4 and the second pole post from contacting the housing 1. The first insulating plate 1203 and the second insulating plate 1204 are sandwiched between the side walls of the housing 1, further sealing the connecting holes.

[0061] Specifically, the insulating assembly 12 includes two insulating posts 1201. Each insulating post 1201 has a through hole 1202 along its axial direction. The two ends of the two insulating posts 1201 are respectively connected to the surface of the first insulating plate 1203 and the second insulating plate 1204. The first insulating plate 1203 and the second insulating plate 1204 have through holes corresponding to the two insulating posts 1201, which are suitable for insulating the second pole from the housing 1.

[0062] Specifically, the insulating component 12 can be made of plastics such as polyamide, polyester, and polyethylene.

[0063] In one embodiment, such as Figure 5 As shown, it also includes:

[0064] The conductive sheet has a first end adapted to be connected to the protection circuit board 5, and a second end connected to the second end of the electrode assembly.

[0065] In one embodiment, such as Figure 1 As shown, it also includes: insulating tape 6, which is pasted on the outer wall of the housing 1.

[0066] In this embodiment, such as Figure 1 and Figure 3 As shown, the housing 1 is connected to the first tab of the bare battery cell, making the housing 1 itself charged. The insulating tape 6 is pasted on the edge of the housing 1 for insulation, preventing short circuits between the housing 1 and the external structure.

[0067] Specifically, the insulating tape 6 includes:

[0068] Multiple strips of first insulating tape are pasted onto the outer wall of housing 1;

[0069] The second insulating tape is used to bond the first circuit board 501 and the second circuit board 503 to the side wall of the housing 1.

[0070] In one embodiment, such as Figure 1 As shown, it also includes an insulating fastener 8 for fixing the housing 1, the insulating fastener 8 being disposed on at least one side in the thickness direction of the housing 1.

[0071] In this embodiment, when there is a need to disassemble the housing 1 later, the insulating fastener 8 can be made of electrolytic adhesive. The electrolytic adhesive will bond and fix the housing 1 to the electrical device. When disassembly is required, the bonding strength of the electrolytic adhesive will be reduced by applying a suitable voltage, thereby separating the housing 1 from the electrical device.

[0072] Specifically, when there is no need to disassemble the housing 1 later, the insulating fastener 8 can be made of double-sided adhesive, making the connection more convenient.

[0073] Specifically, the insulating fastener 8 can also be made of easy-tear adhesive or easy-pull adhesive.

[0074] In one embodiment, each housing 1 is provided with a liquid injection hole 7 corresponding to each receiving cavity 3, and each liquid injection hole 7 is sealed by a sealing plug.

[0075] In this embodiment, the electrolyte is delivered to each receiving cavity 3 through the injection hole 7, so that the bare battery cell in the receiving cavity 3 is immersed in the electrolyte. After the electrolyte is injected, the injection hole 7 is sealed by the sealing plug to prevent the electrolyte from leaking out.

[0076] Specifically, the sealing plug is welded to the housing 1 to improve the sealing effect.

[0077] According to an embodiment of this application, another aspect provides a battery, comprising:

[0078] Multiple battery cells, with electrical connections between them;

[0079] The protection circuit board 5 is connected to the second end of the pole assembly.

[0080] Specifically, the protection circuit board 5 includes a first circuit board 501 and a second circuit board 503 connected to each other. The first circuit board 501 surrounds the periphery of the second circuit board 503. The first circuit board 501 is provided with a first conductive end and a second conductive end. The second circuit board 503 is provided with a cell protection module.

[0081] Specifically, it also includes a molding compound 502 to protect the components on the second circuit board 503.

[0082] Specifically, the conductive sheet 9 includes a first connecting segment 901 and a second connecting segment 902 connected by a flexible conductive element. The first connecting segment 901 is connected to the first conductive end of the first circuit board 501, and the second connecting segment 902 is connected to the first pole post 4 or the second pole post.

[0083] Specifically, the first connecting segment 901 and the second connecting segment 902 are connected by a flexible conductive element, which facilitates the change of rotation angle of the first connecting segment 901 and the second connecting segment 902, making it convenient for installation in the limited space inside the electrical equipment.

[0084] Specifically, the conductive sheet is a nickel sheet.

[0085] Specifically, flexible conductive components can be made of flexible metals, such as copper foil or aluminum foil.

[0086] Specifically, multiple conductive sheets 9 can be set and connected to multiple first poles 4 and multiple second poles, or multiple conductive sheets 9 can be welded into a whole and connected to multiple first poles 4 and multiple second poles.

[0087] In this embodiment, the bare battery cell in the housing cavity 3 transmits electrical energy to the first circuit board 501 through the terminal assembly and conductive sheet 9. The battery cell protection module on the second circuit board 503 controls the input current and voltage to improve the stability of the power supply.

[0088] The cell protection module on the second circuit board 503 can prevent overcharging, over-discharging, overcurrent, short circuits, and other abnormalities of the cell, thereby protecting the cell's safe and stable operation. When a cell malfunctions, the cell protection module will take timely measures, such as disconnecting the cell from the load or causing the entire circuit to fail, to avoid damage to the cell.

[0089] Specifically, the cell protection module includes a balancing circuit module and a balancing voltage module, both of which are connected to the second circuit board 503.

[0090] Specifically, such as Figure 5 As shown, the first circuit board 501 is provided with a first terminal 10 and a second terminal 11. The first circuit board 501 is a flexible circuit board 5, which makes it easy to change the position and orientation of the first terminal 10 and the second terminal 11, and facilitates connection with electrical equipment.

[0091] Specifically, the first connecting post 401 is connected to a first conductive plate 402 at one end located on the outside of the housing 1. The first conductive plate 402 abuts against the side of the first insulating plate 1203 away from the housing 1. The first conductive plate 402 is connected to the second connecting section 902.

[0092] Specifically, the second connecting post is connected to a second conductive plate at one end located on the outside of the housing 1. The second conductive plate abuts against the side of the first insulating plate 1203 away from the housing 1. The second conductive plate is connected to the second connecting section 902.

[0093] It should be noted that the battery includes the battery cell provided in the embodiments of this application, and therefore includes all the advantages of the battery cell mentioned above, so it will not be repeated here.

[0094] According to an embodiment of this application, another aspect provides an electrical device, including a battery.

[0095] It should be noted that the electrical equipment includes the battery cell provided in the embodiments of this application, and therefore also includes all the advantages of the battery cell mentioned above, so it will not be repeated here.

[0096] The following is an example, combined with Figures 1 to 8 A comprehensive explanation of all the above-mentioned plans is provided.

[0097] The housing 1 includes a cover plate 101, a middle frame 102, and a bottom plate 103. The cover plate 101 and the bottom plate 103 are respectively sealed to the middle frame 102. The cover plate 101 and the bottom plate 103 are sealed to the middle frame 102 by laser welding. First, the middle frame 102 and the bottom plate 103 are laser welded. Then, multiple partitions 2 are welded to the bottom plate 103 and the middle frame 102 to form multiple grooves for installing bare battery cells. The bare battery cells are placed in the grooves, and the first electrode tab of the bare battery cells is welded to the bottom plate 103. The cover plate 101 is welded to the middle frame 102 to seal the groove openings, forming a receiving cavity 3. The liquid injection hole 7 is opened on the middle frame 102.

[0098] Multiple bare cells are installed in a housing 1, and the multiple bare cells are connected in parallel inside, so the problem of length matching can be avoided. The same number of bare cells are set in a housing 1, which reduces the space occupied by the wall thickness in the width direction and reduces the space loss of the assembly gap between the cells. When disassembling, since there is only one cell, the risk of cell deformation is reduced and damage to the circuit board 5 is prevented.

[0099] Electrolytic adhesive is used instead of double-sided tape to bond and fix the cover plate 101 or the base plate 103. By applying a suitable voltage to the electrolytic adhesive, the bonding strength of the adhesive can be reduced, thereby allowing the housing 1 to be disassembled. Disassembly using electrolytic adhesive can achieve non-destructive removal of the adhesive, and by replacing double-sided tape with electrolytic adhesive, the thickness of at least one layer of double-sided tape can be reduced in the first direction X, further increasing the cell's storage space and improving the overall energy density. The first direction X is perpendicular to the direction of the cover plate 101.

[0100] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and such modifications and variations all fall within the scope defined by the appended application.

Claims

1. A battery cell, characterized in that, include: The housing (1) is made of conductive material. The inner cavity of the housing (1) is provided with at least one partition (2). The partition (2) divides the inner cavity of the housing (1) into at least two receiving cavities (3). The housing (1) has a connecting hole corresponding to each of the receiving cavities (3). At least two bare cells are installed in each of the receiving cavities (3) in a one-to-one correspondence. Each bare cell has a first tab and a second tab with opposite polarities. The first tab of each bare cell is connected to the housing (1). The electrode assembly has a first end that passes through the connecting hole into the housing (1) and is connected to the second tab of each bare cell. The second end of the electrode assembly is adapted to connect to the protection circuit board (5).

2. The battery cell according to claim 1, characterized in that, The electrode assembly includes a first electrode (4), the first electrode (4) is provided with a first connecting post (401), the first end of the first connecting post (401) passes through the communicating hole and is connected to the second tab of the bare cell in the corresponding receiving cavity (3), the second end of the first connecting post (401) is adapted to connect to the protection circuit board (5), and an insulating component (12) is provided between the first connecting post (401) and the inner wall of the communicating hole.

3. The battery cell according to claim 2, characterized in that, The electrode assembly further includes a second electrode, which is provided with two second connecting posts. The first ends of the two second connecting posts pass through the two connecting holes respectively and are respectively connected to the second tabs of the bare cells in the two adjacent receiving cavities (3). The second ends of the two second connecting posts are adapted to connect to the protection circuit board (5). An insulating component (12) is provided between the second connecting posts and the inner wall of the connecting holes.

4. The battery cell according to claim 3, characterized in that, The insulating component (12) includes at least two insulating posts (1201), each of the insulating posts (1201) is sealed and connected in each of the communicating holes, and each of the insulating posts (1201) has a through hole (1202) along its axial direction. The first connecting post (401) passes through the through hole (1202); and / or, the second connecting post passes through the through hole (1202).

5. The battery cell according to claim 1, characterized in that, Also includes: A conductive sheet (9) is provided, the first end of which is adapted to be connected to a protective circuit board (5), and the second end of which is connected to the second end of the pole assembly.

6. The battery cell according to claim 1, characterized in that, Also includes: Insulating tape (6) is pasted on the outer wall of the housing (1).

7. The battery cell according to claim 1, characterized in that, It also includes an insulating fastener (8) for fixing the housing (1), the insulating fastener (8) being disposed on at least one side of the housing (1) in the thickness direction.

8. The battery cell according to claim 1, characterized in that, Each of the housing (1) is provided with a liquid injection hole (7) corresponding to each of the receiving cavities (3), and each of the liquid injection holes (7) is sealed by a sealing plug.

9. A battery, characterized in that, include: The battery cells according to any one of claims 1 to 8, wherein the plurality of battery cells are electrically connected to each other; The protective circuit board (5) is connected to the second end of the pole assembly.

10. An electrical appliance, characterized in that, include: The battery according to claim 9.

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