Battery cell connecting device, battery cell assembly and secondary battery

Abstract

The invention belongs to the technical field of battery cell components, and particularly relates to a battery cell connecting device, a battery cell component and a secondary battery. The battery cell connecting device comprises an adapter plate and a separating and supporting component, an assembling groove is formed in the surface of one side of the separating and supporting part; the adapter plate is connected to the assembly groove; a guide body is arranged on the surface of the other side, far away from the assembling groove, of the separating and supporting part; a first arc-shaped outer bottom face is arranged on the surface of the side, away from the separating and supporting component, of the guiding body. According to the invention, the original situation that a rubber mat or other filling isolators need to be additionally arranged for isolation treatment can be replaced; the assembling convenience and stability are improved, so that the production and processing efficiency is improved; and the use safety is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of battery cell assemblies, and in particular relates to a battery cell connection device, a battery cell assembly and a secondary battery. Background Art

[0002] With the global emphasis on environmental protection and sustainable development, new energy vehicles, energy storage systems and other fields are developing rapidly. As a core energy source, the market demand for lithium battery cell components continues to grow. As the core component of the battery, the structure, capacity and safety of the battery cell directly determine the relevant performance of the battery. Existing battery cell components usually include multiple stacked battery cells, with a transfer plate provided on the side where the tabs of each battery cell protrude. The transfer plate is provided with tab pads and electrical connection lines. By welding the tabs to the tab pads on the transfer plate, multiple battery cells can be connected in parallel or in series. The transfer plate also provides total positive and total negative electrical connection pads.

[0003] However, the tabs of most existing battery cells are too close together, making them prone to short circuits. Therefore, additional rubber pads are required. Furthermore, the lack of a guide structure during soldering of the tabs of multiple cells to their corresponding pads on the adapter plate makes insertion of the tabs difficult, wastes labor resources, and results in low production and processing efficiency and poor safety. Summary of the Invention

[0004] The purpose of the present invention is to provide a battery cell connection device to address the deficiencies of the prior art, which can solve the technical problem of low production and processing efficiency in the prior art.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A battery cell connection device includes an adapter plate and a partition support component; a mounting groove is provided on one side surface of the partition support component; the adapter plate is connected to the mounting groove; a guide body is provided on the other side surface of the partition support component away from the mounting groove; and a first arc-shaped outer bottom surface is provided on the side surface of the guide body away from the partition support component.

[0007] Preferably, the guide body includes a first arc-shaped guide block; one side surface of the first arc-shaped guide block is connected to the side surface of the partition support component away from the assembly groove; the first arc-shaped outer bottom surface is arranged at the bottom of the first arc-shaped guide block.

[0008] Preferably, the side surface of the first arc-shaped guide block is provided with an outer guide slope; the bottom of the outer guide slope is connected to one side end of the first arc-shaped outer bottom surface; and the outer guide slope is inclined outward from the first arc-shaped outer bottom surface toward the partition support component.

[0009] Preferably, at least one mounting body is further provided on a side surface of the partition support component away from the assembly groove; the mounting body and the guide body are arranged in an alternating manner.

[0010] Preferably, the mounting body includes a second arc-shaped guide block; one side surface of the second arc-shaped guide block is connected to the partition support component; and a side surface of the second arc-shaped guide block away from the partition support component is provided with a second arc-shaped outer bottom surface and a horizontal contact surface.

[0011] Preferably, at least one guide channel is further provided in the partition support component; the guide channel is provided through the thickness of the partition support component and the guide body.

[0012] Preferably, the partition support component is provided with at least one clamping body on a circumferential surface away from the assembly groove; the clamping body is used for clamping and assembling the battery housing.

[0013] Preferably, a positioning hole is provided in the adapter plate; the positioning hole is provided through the thickness of the adapter plate; and a positioning column corresponding to the positioning hole is provided on the partition support component.

[0014] The present invention also discloses a battery cell assembly, including a battery cell body and the battery cell connecting device, wherein the battery cell body includes at least two battery cell structures and at least two assembly connecting pieces; two adjacent battery cell structures are arranged side by side; one side surface of the assembly connecting piece is connected to the battery cell structure; and the assembly connecting piece is connected to the guide body.

[0015] The invention also discloses a secondary battery comprising the battery core assembly.

[0016] The beneficial effect of the present invention is that the technical solution realizes the guiding and separating functions of the separating support component by making the guide body on the separating support component and its first curved outer bottom surface have a certain width; thereby being beneficial to the rapid guiding assembly of the battery cell structure and its rapid guiding, and replacing the original need for additional rubber pads or other filling spacers for isolation treatment; thereby reducing material usage; and improving the convenience and stability of assembly, thereby improving production and processing efficiency; and ensuring safety of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The following will refer to the attached Figures 1 to 7 To describe the features, advantages and technical effects of exemplary embodiments of the present invention.

[0018] Figure 1 This is a schematic structural diagram of a battery cell connection device according to an embodiment of the present invention;

[0019] Figure 2 This is a structural schematic diagram of a separation support component of a cell connection device according to an embodiment of the present invention;

[0020] Figure 3 A partially enlarged view of a separation support component of a battery cell connection device according to an embodiment of the present invention;

[0021] Figure 4 A top view of a separating support component of a cell connection device according to an embodiment of the present invention;

[0022] Figure 5 A partially enlarged view of a separation support component of a battery cell connection device according to an embodiment of the present invention;

[0023] Figure 6 This is a schematic structural diagram of a battery cell assembly according to an embodiment of the present invention;

[0024] Figure 7 This is a partially enlarged view of a battery cell assembly according to an embodiment of the present invention.

[0025] In the figure: 100-adapter plate; 101-limiting groove; 102-positioning hole; 200-partitioning support member; 201-guiding channel; 202-positioning protrusion; 203-positioning column; 204-guide inner arc surface; 205-arc inner bottom surface; 206-assembly channel; 207-assembly groove; 210-support plate; 220-side folding edge; 230-clamping body; 231-mounting plate; 232-clamping protrusion; 233-clamping groove; 300-guide body; 310-first arc guide block; 311-first arc outer Bottom surface; 312-outer guide slope; 320-first connecting block; 321-first vertical reinforcement block; 322-first vertical connecting block; 323-first horizontal connecting block; 400-mounting body; 410-second arc-shaped guide block; 411-first arc-shaped outer bottom surface; 420-second connecting block; 421-second horizontal connecting block; 422-second vertical connecting block; 423-second vertical reinforcement block; 430-jig block; 500-battery cell body; 510-assembly connecting piece; 520-double-sided tape; 530-battery cell structure. DETAILED DESCRIPTION

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0027] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0028] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0029] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, or multiple situations exist. In addition, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0030] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0031] The following is combined with Figures 1 to 7 The present invention is described in further detail, but is not intended to limit the present invention.

[0032] like Figure 1 and 3 As shown, in one embodiment of the present invention, the battery cell connection device includes an adapter plate 100 and a partition support component 200; a mounting groove 207 is provided on one side surface of the partition support component 200; the adapter plate 100 is connected to the mounting groove 207; a guide body 300 is provided on the other side surface of the partition support component 200 away from the mounting groove 207; the guide body 300 is used to connect with the battery cell structure; a first arc-shaped outer bottom surface 311 is provided on the side surface of the guide body 300 away from the partition support component 200. Figure 1 and 2As shown, the number of the guide bodies 300 is at least three, each guide body 300 is extended along the width direction of the partition support member 200 ; and all the guide bodies 300 are arranged equidistantly along the length direction of the partition support member 200 .

[0033] The technical solution of the present invention realizes the guiding and separating functions of the separating support component by making the guide body and the first curved outer bottom surface of the separating support component have a certain width; thereby facilitating the rapid guiding assembly of the battery cell structure and the same, and replacing the original need for additional rubber pads or other filling spacers for isolation treatment; thereby reducing material usage; and improving the convenience and stability of assembly, thereby improving production and processing efficiency; and ensuring safety of use.

[0034] Wherein, in some embodiments, Figure 1 As shown, the partition support member 200 includes a support plate 210 and at least one side flange 220 connected to a side end of the support plate 210. The mounting groove 207 is formed between all side flanges 220 and the support plate 210. The guide body 300 is disposed on a side surface of the support plate 210 away from the partition support member 200. In other words, the side flange 220 and the support plate 210 form an L-shaped or U-shaped or similar retaining bracket structure to ensure the assembly stability of the adapter plate 100, thereby improving safety in use.

[0035] Further, in some embodiments, as Figure 1 As shown, a positioning protrusion 202 is provided on the side surface of the side fold 220 facing the assembly groove 207; a limiting groove 101 is provided on the side end surface of the adapter plate 100; the positioning protrusion 202 is clamped in the limiting groove 101; so as to improve the convenience and speed of assembly of the adapter plate 100; and reduce the investment in labor costs.

[0036] Furthermore, in some embodiments, Figure 1 and 4 As shown, the adapter plate 100 is provided with a positioning hole 102, which extends through the thickness of the adapter plate 100. The support plate 210 is provided with a positioning post 203 corresponding to the positioning hole 102. In other words, the positioning post 203 is assembled to the inner wall of the positioning hole 102 to reduce sliding and misalignment during assembly of the adapter plate, thereby ensuring the assembly stability of the adapter plate 100 and improving safety in use.

[0037] Specifically, in some embodiments, Figure 1 and 2As shown, the guide body 300 includes a first curved guide block 310 and a first connecting block 320. One side surface of the first curved guide block 310 is connected to the side surface of the partition support member 200 away from the assembly groove 207. There are two first connecting blocks 320, which are symmetrically connected to both ends of the first curved guide block 310. The first connecting blocks 320 are connected to the partition support member 200. A first curved outer bottom surface 311 is provided at the bottom of the first curved guide block 310. This structure ensures the assembly stability of the first curved outer bottom surface 311 by reinforcing the support provided by the first connecting block 320, thereby ensuring safety in use.

[0038] Wherein, in some embodiments, Figure 2 and 3 As shown, the side surface of the first curved guide block 310 is provided with an outer guiding slope 312. The bottom of the outer guiding slope 312 is connected to one side of the first curved outer bottom surface 311. The outer guiding slope 312 is inclined outward from the first curved outer bottom surface 311 toward the partition support member 200. Furthermore, there are two outer guiding slopes 312, one on each side of the first curved outer bottom surface 311. In other words, the two outer guiding slopes 312 form a U-shaped structure with the first curved outer bottom surface 311, providing initial guidance for the first curved outer bottom surface 311 and secondary guidance for the outer guiding slopes 312. This facilitates the rapid assembly of the cell structure and improves assembly convenience and stability, thereby increasing production efficiency and ensuring safety. Furthermore, the angle α between the outer guiding slope 312 and the horizontal plane in which it lies is 45°≤α≤60°. That is, α can be 45°, 48°, 50°, 52°, 54°, 58°, 60°, etc., and is preferably 45°.

[0039] Wherein, in some embodiments, Figure 2 and 3 As shown, the first connecting block 320 includes a first vertical reinforcing block 321, a first vertical connecting block 322 and a first horizontal connecting block 323; the first vertical reinforcing block 321 and the first vertical connecting block 322 are arranged side by side, and one side end of the first vertical reinforcing block 321 and one side end of the first vertical connecting block 322 are both connected to one side end of the first arc-shaped guide block 310; both side ends of the first horizontal connecting block 323 are connected to one side surface of the first vertical reinforcing block 321 and one side surface of the first vertical connecting block 322. Further, as Figure 3 As shown, there are two first vertical connecting blocks 322, which are symmetrically arranged on both sides of the first vertical reinforcement block 321; and there are two first horizontal connecting blocks 323, which are both arranged between the first vertical reinforcement block 321 and the first vertical connecting block 322; so as to improve the stability of the assembly and thus improve the safety of use.

[0040] Specifically, in some embodiments, Figure 1 and 2 As shown in Figure 3, at least one mounting body 400 is provided on the side surface of the partition support component 200 away from the assembly groove 207; the mounting body 400 and the guide body 300 are arranged in an interlaced manner; and the mounting body 400 includes a second arc-shaped guide block 410, a second connecting block 420 and a fixture block 430; a side surface of the second arc-shaped guide block 410 is connected to the partition support component 200; a side end of the second connecting block 420 is connected to a side end of the second arc-shaped guide block 410; and the second connecting block 420 is connected to the partition support component 200; a side surface of the second arc-shaped guide block 410 away from the partition support component 200 is provided with a second arc-shaped outer bottom surface 411 and a horizontal contact surface (not shown in the figure); the fixture block 430 is connected to the horizontal contact surface; and a step structure is formed between the fixture block 430 and the second arc-shaped guide block 410. Among them, the horizontal contact surface is a horizontal contact flat surface; this structure increases the separation distance between the battery cell structures through the mounting body 400 to avoid mutual contact short circuit and other phenomena. Furthermore, a vertical flat surface is provided on the circumferential side surface of the second curved guide block 410. By using the mounting body 400 and its first curved outer bottom surface 411 and the vertical flat surface as different assembly contact surfaces, a wider range of assembly types can be accommodated, thereby improving assembly convenience and stability, thereby increasing production and processing efficiency and ensuring safety in use.

[0041] Wherein, in some embodiments, Figure 2 and 3 As shown, the second connecting block 420 includes a second horizontal connecting block 421, a second vertical connecting block 422 and a second vertical reinforcing block 423; the second vertical connecting block 422 and the second vertical reinforcing block 423 are arranged side by side, and one side end of the second vertical connecting block 422 and one side end of the second vertical reinforcing block 423 are both connected to one side end of the second arc-shaped guide block 410; both side ends of the second horizontal connecting block 421 are connected to one side surface of the second vertical connecting block 422 and one side surface of the second vertical reinforcing block 423. Further, as Figure 3 As shown, there are two second vertical connecting blocks 422, which are symmetrically arranged on both sides of the second vertical reinforcement block 423; and there are two second horizontal connecting blocks 421, which are both arranged between the second vertical connecting block 422 and the second vertical reinforcement block 423; so as to improve the stability of the assembly and thus improve the safety of use.

[0042] Specifically, in some embodiments, Figure 1As shown, at least one flow channel 201 is provided within the partition support member 200. This flow channel 201 extends through the thickness of the partition support member 200 and the guide body 300, and / or extends through the thickness of the partition support member 200 and the mounting body 400. This structure ensures the fluidity of the hot melt adhesive, which provides both a fixed and insulating function, by guiding the flow through the flow channel, further improving the assembly stability between the battery cell and the guide body. This reduces material usage, increases assembly convenience and stability, thereby improving production and processing efficiency, and ensures safety in use.

[0043] Specifically, in some embodiments, Figure 3 and 5 As shown, at least one guiding inner arc surface 204 is provided on the inner circumferential side of the guide channel 201. Figure 5 As shown, guiding inner curved surfaces 204 are provided in the left, right, front, and back directions of the guide channel 201. Furthermore, the width of the guide channel 201 at its opening toward the assembly slot 207 is greater than the width of the guide channel 201 at its opening away from the assembly slot 207. The provision of guiding inner curved surfaces 204 allows the inner diameter of the guide channel 201 to increase from top to bottom, thereby facilitating heat conduction from the adapter plate 100 and preventing clogging of the fixing adhesive, ensuring smooth flow of the fixing adhesive.

[0044] Specifically, in some embodiments, Figure 3 and 5 As shown, the inner bottom surface of the flow guiding channel 201 is further provided with a curved inner bottom surface 205; the depth of the curved inner bottom surface 205 toward the bottom opening of the guiding inner curved surface 204 is greater than the depth of the curved inner bottom surface 205 away from the bottom opening of the guiding inner curved surface 204. In other words, the curved inner bottom surface 205, which is higher on one side (closer to the bottom opening of the guiding inner curved surface 204) and lower on the inner bottom surface of the flow guiding channel 201, is provided to ensure the fluidity of the fixing glue, allowing it to flow faster between the battery cells, thereby ensuring assembly stability between the battery cells and improving safety in use.

[0045] Specifically, in some embodiments, Figure 1 and 2 As shown, the partition support member 200 (middle fold 220) is provided with at least one clamping body 230 on the circumferential surface away from the assembly groove 207; the clamping body 230 is used for clamping and assembling the battery shell (liner). Figure 2 、 4As shown in Figures 5 and 6, the clamping body 230 includes a mounting plate 231 and at least two clamping protrusions 232; one side end of the mounting plate 231 is connected to the partition support member 200 (the middle side fold 220); all the clamping protrusions 232 are arranged side by side and connected to the side surface of the mounting plate 231; and a clamping groove 233 is provided between two adjacent clamping protrusions 232 and the mounting plate 231. That is, an E-type or F-type structure is formed between the clamping protrusions 232 and the mounting plate 231. Further, as shown in FIG. Figure 4 and 5 As shown, all the engaging protrusions 232 are relatively (symmetrically or asymmetrically) arranged on the two side surfaces of the mounting plate 231 to improve the convenience of assembly and disassembly with other parts and ensure assembly stability.

[0046] Specifically, in some embodiments, Figure 5 As shown, an assembly channel 206 is provided on the partition support component 200 (middle support plate 210); the assembly channel 206 is set to pass through the thickness of the partition support component 200 (middle support plate 210); and the assembly channel 206 is used to allow the pole piece connecting conductive sheet to pass through; the adapter plate 100 is electrically connected to the pole piece connecting conductive sheet.

[0047] The present invention also provides a battery core assembly, such as Figure 6 and 7 As shown, the battery cell assembly includes a battery cell connection device and a battery cell body 500. The battery cell body 500 includes at least two battery cell structures 530, at least one assembly connection sheet 510, and double-sided tape 520. The double-sided tape 520 is connected to a side surface between two adjacent battery cell structures 530. A side surface of the assembly connection sheet 510 is connected to the circumferential surface of the battery cell structure 530 away from the double-sided tape 520. The assembly connection sheet 510 is connected to the guide body 300. A tab structure is connected to one side end of the assembly connection sheet 510. The specific structure of the battery cell connection device is similar to the above-mentioned embodiments. Since the present battery cell assembly adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above-mentioned embodiments, which will not be described in detail here.

[0048] The battery cell structure 500 includes a positive electrode sheet, a negative electrode sheet, and a separator. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, which is coated on the surface of the positive electrode current collector. The material of the positive electrode current collector can be aluminum, and the positive electrode active material layer includes a positive electrode active material, which can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, which is coated on the surface of the negative electrode current collector. The material of the negative electrode current collector can be copper, and the negative electrode active material layer includes a negative electrode active material, which can be carbon or silicon. The separator can be made of PP (polypropylene) or PE (polyethylene).

[0049] That is to say, during assembly, the two battery cell structures 530 with assembly connecting pieces and tab structures are pushed toward the guide body 300 to achieve the assembly of the assembly connecting pieces against the outer guide slope 312 of the guide body 300; the tab structure passes through the assembly channel 206; and then the tabs of the same polarity of different battery cell structures 530 are welded together; and then the hot melt adhesive is transported through the guide channel 201 to enhance the stability of the assembly.

[0050] The present invention also provides a secondary battery, which includes a cell assembly. The specific structure of the cell assembly refers to the above embodiment. Since this secondary battery adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0051] Rechargeable batteries, also known as rechargeable batteries or storage batteries, are batteries that can be recharged to reactivate their active materials after discharge, allowing for continued use. The reversibility of chemical reactions allows for the regeneration of a new battery. This means that after a chemical reaction is converted into electrical energy, the electrical energy can be used to repair the chemical system and then re-convert the chemical reaction into electrical energy, hence the name secondary battery (rechargeable battery). The main rechargeable batteries on the market include nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid (or lead-acid) batteries, lithium-ion batteries, and polymer lithium-ion batteries.

[0052] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0053] Based on the disclosure and teachings of the above description, those skilled in the art will be able to make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the above specific embodiments, and any obvious improvements, substitutions, or modifications made by those skilled in the art based on the present invention fall within the scope of protection of the present invention. In addition, although certain specific terms are used in this description, these terms are for convenience of description only and do not constitute any limitation to the present invention.

Claims

1. A battery cell connection device, characterized in that: It includes an adapter plate and a partition support component; one side surface of the partition support component is provided with an assembly groove; the adapter plate is connected to the assembly groove; the other side surface of the partition support component away from the assembly groove is provided with a guide body; the side surface of the guide body away from the partition support component is provided with a first arc-shaped outer bottom surface.

2. The battery cell connection device according to claim 1, characterized in that: The guide body includes a first arc-shaped guide block; one side surface of the first arc-shaped guide block is connected to the side surface of the partition support component away from the assembly groove; the first arc-shaped outer bottom surface is arranged at the bottom of the first arc-shaped guide block.

3. The battery cell connection device according to claim 2, characterized in that: The side surface of the first arc-shaped guide block is provided with an outer guide slope; the bottom of the outer guide slope is connected to one side end of the first arc-shaped outer bottom surface; and the outer guide slope is inclined outward from the first arc-shaped outer bottom surface toward the partition support component.

4. The battery cell connection device according to claim 1, characterized in that: At least one mounting body is further provided on a side surface of the partition support component away from the assembly groove; the mounting body and the guide body are arranged in a staggered distribution.

5. The battery cell connection device according to claim 4, characterized in that: The mounting body includes a second arc-shaped guide block; one side surface of the second arc-shaped guide block is connected to the partition support component; and a side surface of the second arc-shaped guide block away from the partition support component is provided with a second arc-shaped outer bottom surface and a horizontal contact surface.

6. The battery cell connection device according to any one of claims 1 to 5, characterized in that: At least one guide channel is further provided in the partition support component; the guide channel is provided through the thickness of the partition support component and the guide body.

7. The battery cell connection device according to claim 1, characterized in that: The partition support component is provided with at least one clamping body on a circumferential surface away from the assembly groove; the clamping body is used for clamping and assembling the battery shell.

8. The battery cell connection device according to claim 1, characterized in that: A positioning hole is provided in the adapter plate; the positioning hole is set to penetrate the thickness of the adapter plate; and a positioning column corresponding to the positioning hole is provided on the partition support component.

9. A battery cell assembly, characterized in that: It comprises a battery cell body and a battery cell connection device as described in any one of claims 1 to 9 above, wherein the battery cell body comprises at least two battery cell structures and at least two assembly connecting pieces; two adjacent battery cell structures are arranged side by side; one side surface of the assembly connecting piece is connected to the battery cell structure; and the assembly connecting piece is connected to the guide body.

10. A secondary battery, characterized in that: Including the battery core assembly according to claim 9.

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