Large cylindrical battery cell integrated pack structure

Abstract

The utility model discloses an integrated pack structure of a large cylindrical battery cell. The integrated pack structure comprises a box body, the box cover is arranged on the box body and is used for sealing; the Block battery assembly is arranged between the box body and the box cover; the CCS assembly is arranged at the end part of the Block battery assembly; the glue pouring fixing body is arranged in the middle of the Block battery assembly; the Block battery assembly and the CCS assembly are sealed through the box body and the box cover and are coupled and connected through the glue pouring fixing body, and a high-strength three-dimensional space structure is formed. According to the utility model, the glue pouring fixing body is effectively coupled and connected with the box body, the box cover and the BLOCK battery assembly to form a three-dimensional space strength system. Therefore, the cable has enough shock resistance, extrusion resistance and impact resistance.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electric core, especially relates to a big cylindrical electric core integration pack structure. BACKGROUND

[0002] The existing big cylindrical battery pack design scheme often covers several key elements: welding electric core connection system (CCS), pouring glue fixing and the design of explosion-proof channel.

[0003] In the process of welding CCS, the top of the electric core is the main position of welding operation. In order to stabilize the electric core, the pouring glue step is indispensable, which can firmly fix the electric core by injecting glue on the top of the electric core after the glue foaming. However, the glue must be carefully considered in the process of flowing down and flattening its possible interference to the explosion-proof channel.

[0004] Since each string of electric cores needs an independent sampling point to meet the system monitoring requirement, and the number of series and parallel connection of the pack is usually large, the number of sampling points on the CCS will also increase accordingly. Each sampling point needs a certain width, which leads to that the top of the cylindrical pack is occupied by a large area of space by the CCS.

[0005] At the same time, the use of pouring glue requires sufficient pouring channel to ensure its smooth flow, flattening and final foaming and curing. These channels often need a larger space to facilitate the flow of glue, but this directly conflicts with the space required by the top CCS.

[0006] In addition, when the glue is poured down and foamed, there is a risk of invading the explosion-proof channel, which is another problem that needs to be carefully considered and avoided. INVENTION CONTENTS

[0007] The utility model discloses a big cylindrical electric core integration pack structure to overcome the defects in the prior art, to achieve the above object, to solve the problems in the background art.

[0008] A big cylindrical electric core integration pack structure comprises:

[0009] A box body;

[0010] A box cover arranged in the box body for sealing;

[0011] A Block battery assembly arranged between the box body and the box cover;

[0012] A CCS assembly arranged at the end of the Block battery assembly; and

[0013] A pouring glue fixing body arranged in the middle of the Block battery assembly;

[0014] The Block battery assembly and the CCS assembly are sealed by the box body and the box cover, and are coupled by the glue pouring fixing body, so that a high-strength three-dimensional space structure is formed.

[0015] As a further scheme of the utility model: the Block battery assembly includes a battery cell, a bottom support arranged at the bottom end of the battery cell, a sealing strip arranged between the battery cell and the bottom support, a liquid cooling system arranged at the battery cell in a circumferential direction, a first protective plate and a second protective plate arranged at both sides of the battery cell, and an explosion-proof valve arranged at the bottom end of the battery cell. The design further enhances the safety and stability of the battery assembly, the sealing strip and the protective plate effectively prevent external environmental interference, and the liquid cooling system ensures that the temperature of the battery cell is controlled within a safe range, thereby prolonging the service life of the battery.

[0016] As a further scheme of the utility model: the liquid cooling system includes an upper layer pipeline, a three-way joint connected to the upper layer pipeline, and a liquid cooling plate arranged between the battery cells. This design of the liquid cooling system makes the cooling efficiency higher and the maintenance more convenient, thereby improving the heat dissipation performance and reliability of the battery pack.

[0017] As a further scheme of the utility model: a sealing ring is arranged at the outer ring of the explosion-proof valve. The sealing ring can prevent glue from flowing into the explosion-proof valve area along the bottom of the battery cell during glue pouring, thereby affecting the opening of the explosion-proof valve.

[0018] As a further scheme of the utility model: the CCS assembly is arranged at the upper end of the battery cell.

[0019] As a further scheme of the utility model: the CCS assembly includes a bottom support plate, an FPC flexible circuit layer arranged at the upper end of the bottom support plate, an electrical connection layer arranged at the upper end of the FPC flexible circuit layer, and a pressing plate arranged at the upper end of the FPC flexible circuit layer. The design makes the structure of the CCS assembly more compact and reliable, and facilitates installation and maintenance, thereby improving the performance and safety of the battery pack.

[0020] As a further scheme of the utility model: the bottom support plate is composed of epoxy resin and / or PC material. The selection of these materials makes the bottom support plate have excellent mechanical properties and corrosion resistance, thereby improving the stability and service life of the CCS assembly.

[0021] As a further scheme of the utility model: the FPC flexible circuit layer is formed by PET and copper foil to form a sampling circuit structure. The sampling circuit is more flexible and reliable, and is convenient to connect with the battery cell, thereby improving the sampling accuracy and stability of the battery pack.

[0022] As a further scheme of the utility model: the electric connection layer adopts copper bar and / or aluminum bar, and is used for forming a high-voltage loop. The selection of the copper bar and the aluminum bar makes the electric connection layer have excellent electric conductivity and mechanical strength, and ensures the safety and reliability of the high-voltage loop.

[0023] As a further scheme of the utility model: the glue filling fixing body adopts structural glue or heat-conducting structural glue, and forms a structure. The design not only provides firm connection between the battery assemblies, but also enhances the heat dissipation performance of the battery pack, improves the stability and safety of the overall structure.

[0024] Compared with the prior art, the utility model has the following technical effects:

[0025] The technical scheme is adopted, Block battery assemblies are arranged between the box body and the box cover, CCS assemblies are arranged at the ends of the Block battery assemblies, and glue filling fixing bodies are formed in the middle of the Block battery assemblies, effective sealing and firm connection of the battery assemblies and the CCS assemblies are realized, a high-strength three-dimensional space structure is formed, the sealing performance and the shock resistance of the battery pack are improved, and safe and stable operation and efficient management of the battery system are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0026] The specific embodiments of the utility model will be described in detail below with reference to the drawings:

[0027] Figure 1 It is a schematic view of the electric core integrated pack structure of the disclosed embodiment of the application;

[0028] Figure 2 It is a structural schematic view of the Block battery assembly of the disclosed embodiment of the application;

[0029] Figure 3 It is a structural schematic view of the sealing ring of the disclosed embodiment of the application;

[0030] Figure 4 It is a structural schematic view of the CCS assembly of the disclosed embodiment of the application;

[0031] Figure 5 It is a front view schematic view of the liquid cooling system of the disclosed embodiment of the application;

[0032] Figure 6 It is a three-dimensional schematic view of the liquid cooling system of the disclosed embodiment of the application.

[0033] In the figure: 1, box; 2, box cover; 3, Block battery assembly; 31, battery cell; 32, bottom support; 33, sealing strip; 34, liquid cooling system; 341, upper layer pipeline; 342, three-way joint; 343, liquid cooling plate; 35, first protective plate; 36, second protective plate; 37, explosion-proof valve; 371, sealing ring; 4, CCS assembly; 41, bottom support plate; 42, FPC flexible circuit layer; 43, electrical connection layer; 44, pressing plate. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0035] Please refer to Figure 1 In the embodiments of the present application, a large cylindrical battery cell integrated pack structure comprises:

[0036] The box 1;

[0037] The box cover 2 for sealing is arranged in the box 1;

[0038] The Block battery assembly 3 is arranged between the box 1 and the box cover 2, wherein Block specifically refers to a modular battery assembly, and the battery assembly is usually composed of a battery cell (Cell), a battery management system (BMS), a protection circuit, a shell and the like;

[0039] The CCS assembly 4 is arranged at the end of the Block battery assembly 3, and the CCS (Cells Contact System) is an integrated busbar, also known as a battery cover plate assembly; a stable electrical connection is provided, and through the CCS battery cell connection assembly, each battery module can realize reliable electrical connection to form a complete energy transmission path; and

[0040] The glue filling fixing body is arranged in the middle of the Block battery assembly 3;

[0041] The Block battery assembly 3 and the CCS assembly 4 are sealed by the box 1 and the box cover 2, and are coupled and connected by the glue filling fixing body to form a high-strength three-dimensional space structure.

[0042] In this embodiment, the Block battery assembly 3 includes the battery cell 31, the bottom support 32 arranged at the bottom end of the battery cell 31, the sealing strip 33 arranged between the battery cell 31 and the bottom support 32, the liquid cooling system 34 arranged circumferentially on the battery cell 31, the first protective plate 35 and the second protective plate 36 arranged on both sides of the battery cell 31, and the explosion-proof valve 37 arranged at the bottom end of the battery cell 31.

[0043] As shown in the structural schematic diagram of the Block battery assembly 3, Figure 2

[0044] Specifically, the Block battery assembly 3 is composed of a plurality of large cylindrical battery cells 31 connected in series and parallel, and the CCS assembly 4 is welded at the top of the battery cell 31; the battery cells 31 are fixed by the structural pouring glue; and the bottom of the Block battery assembly 3 is composed of the bottom support 32. An explosion-proof channel is formed below the bottom support 32.

[0045] In this embodiment, as shown in the structural schematic diagram of the sealing ring 371, Figure 3

[0046] In this embodiment, the CCS assembly 4 is arranged at the upper end of the battery cell 31. It mainly includes the bottom support plate 41, the FPC flexible circuit layer 42 arranged at the upper end of the bottom support plate 41, the electrical connection layer 43 arranged at the upper end of the FPC flexible circuit layer 42, and the pressing plate 44 arranged at the upper end of the FPC flexible circuit layer 42.

[0047] As shown in the structural schematic diagram of the CCS assembly 4, Figure 4

[0048] The CCS assembly 4 is composed of four parts: the bottom support plate 41, usually made of epoxy resin, PC material, etc., the flexible circuit layer in the middle, mainly PET and copper foil; it is mainly a sampling circuit; the next layer is the electrical connection layer 43, mainly copper bar and aluminum bar, used to form a high-voltage loop; and the topmost is the pressing plate 44.

[0049] In this embodiment, the liquid cooling system 34 includes the upper pipe 341, the three-way joint 342 connected to the upper pipe 341, and the liquid cooling plate 343 arranged between the battery cells 31.

[0050] As shown in the front view schematic diagram of the liquid cooling system 34, Figure 5

[0051] As shown in the front view schematic diagram of the liquid cooling system 34, Figure 6 ​​​​​

[0052] When high rate discharge, due to large current will produce a large amount of heat accumulation, so the system needs to use each row of battery 31 matching a liquid cooling plate 343. The gap between the two liquid cooling plate 343 is too small, the existing pipe joint can not adapt to this kind of application environment.

[0053] In this embodiment, the pipe joint is designed with inner and outer two layers by using double color injection molding process, the inner layer is soft glue, and the outer layer is hard glue. The size of the pipe joint between the two cold plates can be <45mm. At the same time, it can be flexibly assembled, which can meet the condition that there is a certain center deviation between the two pipes. The deviation is ≤10mm.

[0054] On this basis, the three-way joint 342 is formed by double color injection molding. The male head of the liquid cooling plate 343 on both sides can be inserted into the corresponding plug of the three-way joint 342, and the corresponding female head on the upper pipe 341 can be conveniently inserted into the corresponding position of the three-way joint.

[0055] In this embodiment, the bottom support plate 41 is made of epoxy resin and / or PC material, the FPC flexible circuit layer 42 is made of PET and copper foil, the sampling circuit structure is formed, and the electric connection layer 43 is made of copper bar and / or aluminum bar, which is used to form a high voltage loop.

[0056] In this embodiment, the glue filling fixing body adopts structural glue or heat conducting structural glue, and forms a structure, and the type of glue can also select foaming glue.

[0057] The uppermost pressing plate 44, when the CCS assembly 4 is composed, connects the whole CCS assembly 4, so that the strength of the whole CCS assembly 4 is better. When the glue foams, the pressing plate 44 can also be bound under the support of the box cover 2, so as to avoid the FPC flexible circuit layer 42 being lifted by the foaming glue. The pressing plate 44 connects the bottom support plate 41, the electric connection layer 43 and the pressing plate 44 through the protrusions on the bottom support plate 41.

[0058] The electric connection layer 43 of the second upper layer is the electric connection layer 43 of the cylindrical battery 31, which is used to connect the positive electrode of the battery 31 and the negative electrode of the shell. The electric connection layer 43 is connected by the long and narrow small arm, so that the whole aluminum bar can form a whole. It is used for connecting between every two groups of battery 31. The aluminum bar is in Y shape or V, W shape; at the same time, the electric connection layer 43 has positioning holes, which can fix the electric connection layer 43 on the bottom support plate 41 through the positioning holes. Make the whole assembly process simple.

[0059] The electric connection layer 43 is covered on the FPC flexible circuit layer 42. All branches are covered. The opportunity of effectively preventing damage to the FPC flexible circuit layer 42 from above can be prevented. At the same time, when the electric connection layer 43 and the pole are welded, some splashing metal beads are generated. The high-temperature beads can scald the FPC flexible circuit layer 42. After the FPC flexible circuit layer 42 in the utility model is covered by the electric connection layer 43, the situation that the beads fall on the FPC flexible circuit layer 42 can be effectively reduced. The yield in the process is greatly improved;

[0060] The FPC flexible circuit layer 42 in the middle is provided with a plurality of openings in the shape of the cylindrical battery cell 31. The opening shape can be a circular, triangular, quadrilateral or other hollow structure. The hollow structure also exists in the area of the bottom support plate 41 of the bottom layer and the area of the pressing plate 44 of the top.

[0061] The hollow structure is generally used when the cylindrical battery cell 31 is grouped, and the adhesive is used to provide a passage for the adhesive. The adhesive can be structural adhesive or heat-conducting structural adhesive. Because the flowability of the adhesive is poor, when the gap is small, the adhesive is difficult to soak into the entire pack according to the design requirements. Through uniform distribution, the purpose of uniform foaming is achieved.

[0062] Beneficial effects:

[0063] The box body 1, the box cover 2 and the Block battery assembly 3 can be effectively coupled and connected to form a three-dimensional space strength system. It has sufficient anti-seismic, anti-extrusion and anti-impact ability.

[0064] In the Block battery assembly 3, the CCS assembly 4, the battery cell 31, the liquid cooling system 34, the first protective plate 35 and the second protective plate 36 can form a complete whole through the adhesion of the foaming adhesive. After the first protective plate 35 and the second protective plate 36 are adhered, the side collision protection can be completed. It can protect the internal battery cell 31 from direct extrusion, and the side impact can be directly given to the Block battery assembly 3, which is composed of the adhesive, the battery cell 31 and the liquid cooling plate 343, to form an effective anti-extrusion body. Direct extrusion of the liquid cooling pipeline is avoided to cause the pipeline to be extruded and broken.

[0065] The pressure adhesive plate is used on the top of the battery cell 31 to fill the gap between the CCS assembly 4 and the upper cover. When the upper cover is locked, the pressure adhesive plate can apply a downward constraint to the electric connecting piece in the CCS assembly 4 and other parts of the Block battery assembly 3, so as to avoid that the internal adhesive foaming extrudes the electric connecting piece and the Block battery assembly 3 upward, thereby damaging the welding area and the weak area of the Block battery assembly 3;

[0066] The bottom smoke exhaust channel of the box body 1 and the battery assembly 3 are sealed by the sealing strip 33, so that a sealed environment is formed, and the glue is prevented from entering the explosion venting channel.

[0067] It is apparent for a person skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, the scope of the present application being defined by the appended claims rather than that of the above description, and it is intended to embrace all changes and modifications that fall within the meaning and scope of equivalents of the claims, any appended drawings being included for illustrative purposes only and not being intended to limit the claims. The present application is not limited to the details given hereinabove of the described exemplary embodiments but can be carried out in other concrete forms without departing from the spirit or essential characteristics of the application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, the scope of the present application being defined by the appended claims rather than that of the above description, and it is intended to embrace all changes and modifications that fall within the meaning and scope of equivalents of the claims, any appended drawings being included for illustrative purposes only and not being intended to limit the claims.

[0068] Furthermore, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment necessarily contains only one independent technical solution, and the present specification is described in this way only for the sake of clarity, and a person skilled in the art should consider the present specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by a person skilled in the art.

Claims

1. A large cylindrical cell integrated pack structure, characterized by, The application relates to a battery pack, which comprises the following parts: a box (1); a box cover (2) arranged on the box for sealing; a Block battery assembly (3) arranged between the box and the box cover; a CCS assembly (4) arranged at the end of the Block battery assembly; and a glue-filling fixing body arranged in the middle of the Block battery assembly. The Block battery assembly and the CCS assembly are sealed by the box and the box cover, and are coupled and connected by the glue-filling fixing body, so that a high-strength three-dimensional space structure is formed.

2. The large cylindrical cell integrated pack structure according to claim 1, characterized in that, The Block battery assembly comprises a battery cell (31), a bottom support (32) arranged at the bottom end of the battery cell, a sealing strip (33) arranged between the battery cell and the bottom support, a liquid cooling system (34) arranged in the circumferential direction of the battery cell, a first protective plate (35) and a second protective plate (36) arranged on both sides of the battery cell, and an explosion-proof valve (37) arranged at the bottom end of the battery cell.

3. The large cylindrical cell integrated pack structure according to claim 2, characterized in that, The liquid cooling system (34) comprises an upper layer pipeline (341), a three-way joint (342) connected to the upper layer pipeline, and a liquid cooling plate (343) arranged between the battery cells.

4. The large cylindrical cell integrated pack structure according to claim 2, wherein A sealing ring is arranged on the outer ring of the explosion-proof valve.

5. The large cylindrical cell integrated pack structure according to claim 2, wherein The CCS assembly is arranged at the upper end of the battery cell.

6. The large cylindrical cell integrated pack structure according to claim 5, wherein The CCS assembly comprises a bottom support plate (41), an FPC flexible circuit layer (42) arranged at the upper end of the bottom support plate, an electric connection layer (43) arranged at the upper end of the FPC flexible circuit layer, and a pressing plate (44) arranged at the upper end of the FPC flexible circuit layer.

7. The large cylindrical cell integrated pack structure according to claim 6, wherein The bottom support plate is made of epoxy resin and / or PC material.

8. The large cylindrical cell integrated pack structure according to claim 6, wherein The FPC flexible circuit layer is made of PET and copper foil, and forms a sampling circuit structure.

9. The large cylindrical cell integrated pack structure according to claim 6, wherein The electric connection layer is made of copper bar and / or aluminum bar, and is used for forming a high-voltage loop.

10. The large cylindrical cell integrated pack structure of claim 1, wherein The glue-filling fixing body is made of structural glue or heat-conducting structural glue, and forms a structure.

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