Lithium battery assembly structure and assembly method

Abstract

The invention discloses a lithium battery assembly structure and an assembly method. The lithium battery assembly structure comprises a positive collector plate, a negative collector plate and a plurality of battery assembly modules, the plurality of battery assembly modules are stacked, and the positive collector plate and the negative collector plate are respectively mounted at the upper end and the lower end of the stacked battery assembly modules; the battery assembly module comprises an assembly body and a plurality of battery cells, the assembly body is vertically provided with a plurality of mounting holes matched with the battery cells, the bottoms of the mounting holes are provided with diversion pole bases, the lower ends of the battery cells abut against the upper end faces of the diversion pole bases, and the lower end faces of the diversion pole bases abut against the upper end faces of the battery cells. The lower end face of the backflow electrode seat at the lowermost layer is conducted with the negative electrode collector plate, and the positive electrode collector plate is conducted with the positive electrode of the battery cell in the battery assembly module at the uppermost layer. The lithium battery assembly structure does not need to be welded, and various risks in the welding process are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium batteries, and in particular to a lithium battery assembly structure and an assembly method. Background Art

[0002] With the rise of new energy, lithium battery technology has also advanced rapidly, greatly improving the performance of lithium battery packs. As a result, more and more fields choose lithium battery packs for energy storage and supply, such as new energy electric vehicles, clean energy storage, home lighting, and outdoor tourism. However, the traditional lithium battery packs used in these fields are mostly welded, which also makes it difficult to expand the capacity of these lithium battery packs. When traditional lithium battery packs are used in different scenarios, multiple lithium batteries need to be connected in series or in parallel.

[0003] At present, the positive and negative electrode converging devices of battery cells are mainly assembled by welding process. In addition to the unavoidable internal stress, cold welding, false welding and other defects of welding process, there is also the risk of welding through the positive electrode protective film of the battery, which is difficult to avoid in the mass production process. The consequence of welding through directly leads to battery leakage, which in turn causes changes in battery cell performance, such as overcharging, over-discharging, overheating, etc. More seriously, because the battery liquid contains flammable organic matter, it will cause the battery pack to catch fire or even explode due to overheating or external temperature, electrical contact point sparks, etc. After welding, the surface electroplating layer of the welding position is completely destroyed, and the anti-corrosion performance is greatly reduced. Due to the corrosion of the welding point and the vibration of the vehicle body over time, there is a risk of the welding point falling off or the welding position becoming smaller, resulting in no power output of the battery cell. More seriously, due to the reduction of the overcurrent capacity of the contact point, it will heat up and cause the battery pack to catch fire. Ultimately, the overall performance of the battery pack is reduced, the safety performance is reduced, and the use requirements of the whole vehicle are reduced. Summary of the invention

[0004] The problem to be solved by the present invention is to provide a lithium battery assembly structure and an assembly method, which do not require welding and avoid various risks in the welding process.

[0005] The present invention provides a technical solution to solve the above problems: a lithium battery assembly structure, comprising a positive current collecting plate, a negative current collecting plate and a plurality of battery assembly modules; the plurality of battery assembly modules are stacked, and the positive current collecting plate and the negative current collecting plate are respectively installed at the upper end and the lower end of the stacked battery assembly modules;

[0006] The battery assembly module includes an assembly body and a plurality of battery cells. The assembly body is vertically provided with a plurality of mounting holes that cooperate with the battery cells. A current guide pole seat is provided at the bottom of the mounting hole. The lower end of the battery cell abuts against the upper end surface of the current guide pole seat, and the lower end surface of the current guide pole seat abuts against the upper end surface of the battery cell. The lower end surface of the bottom layer of the reverse current pole seat is connected to the negative electrode collector plate, and the positive electrode collector plate is connected to the positive electrode of the battery cell in the top layer of the battery assembly module.

[0007] Preferably, the guide pole seat includes a mounting block, an abutment plate, a spring and a lower conduction block, the mounting block is fixedly mounted at the bottom of the mounting hole, the spring and the lower conduction block are respectively mounted on the upper end face and the lower end face of the mounting block, and the abutment plate is fixedly connected to one end of the spring away from the mounting plate.

[0008] Preferably, the lower conductive block is truncated cone-shaped.

[0009] Preferably, the positive electrode current collecting plate, the negative electrode current collecting plate and the battery assembly module are all provided with axial bolt holes, and bolts are provided in the bolt holes.

[0010] Preferably, the mounting holes are arranged in an annular array in the assembly body.

[0011] Preferably, a cooling component is also included, and the cooling component is installed in the assembly body to cool the battery cell.

[0012] Preferably, the cooling component includes a plurality of cooling bags and a plurality of connecting sections, wherein the plurality of cooling bags are arranged in a circular array, and the plurality of connecting sections are used to connect two adjacent cooling bags. The assembly is provided with a plurality of mounting grooves 1 for cooperating with the cooling bags and mounting grooves 2 for cooperating with the connecting sections, wherein the mounting grooves 1 are arranged around the mounting holes, and the mounting grooves 1 are connected with the mounting holes through the connecting grooves.

[0013] Preferably, the cooling bag comprises a bag body and two rubber pressure rods, the rubber pressure rods are adapted to the shape of the mounting groove, the two rubber pressure rods are installed at the upper and lower ends of the cooling bag, the bag body is made of deformable material, a pleated section is provided on the end face of the bag body close to the battery cell, and an extrusion plate matching the mounting groove is provided on the lower end face of the assembly body. When the upper and lower battery assembly modules are stacked, the extrusion plate on the lower end face of the upper assembly body extends into the mounting groove on the upper end face of the lower assembly body to extrude the rubber pressure rods, and the pleated section can be unfolded and tightly attached to the outer circumferential surface of the battery cell after the bag body is pressurized.

[0014] Preferably, an injection port and a liquid outlet are provided on the outer circumferential surface of the assembly, an injection pipe is provided in the injection port, and a liquid outlet pipe is provided in the liquid outlet, one end of the injection pipe and the liquid outlet pipe are connected to the cooling component, and the end of the liquid outlet pipe and the injection pipe away from the cooling component is connected to the coolant circulation device.

[0015] The present invention also discloses an assembly method of a lithium battery assembly structure, the assembly method comprising the following steps:

[0016] S1. Select the corresponding number of assemblies, battery cells and cooling components as needed, and install the battery cells and cooling components into the assemblies to form a battery assembly module;

[0017] S2, installing the bottom battery assembly module onto the negative electrode current collecting plate, and ensuring that the negative electrode current collecting plate is in conduction with the lower conductive block of the bottom battery assembly module;

[0018] S3, stacking and installing the remaining battery assembly modules in sequence;

[0019] S4, cover the positive electrode current collecting plate onto the uppermost battery assembly module;

[0020] S5. Insert bolts into the bolt holes on the assembly, the negative electrode current collector plate, and the positive electrode current collector plate, and tighten them with nuts.

[0021] Compared with the prior art, the advantages of the present invention are: the present invention provides multiple battery assembly modules, the multiple battery assembly modules can be stacked and installed, and the upper and lower battery cells are connected through the reverse current pole seat, so welding is not required, avoiding various risks in the welding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 is a top view of an assembly of the present invention;

[0025] Figure 3 is a bottom view of the assembly of the present invention;

[0026] Figure 4 is a schematic diagram of a cooling assembly of the present invention;

[0027] Figure 5 is a schematic diagram of a cooling bag of the present invention;

[0028] Figure 6 is a schematic diagram of the pleated section of the cooling bag of the present invention after being unfolded;

[0029] Figure 7 yes Figure 5 The enlarged schematic diagram of point A in the middle;

[0030] Figure 8 It is a cross-sectional view of the battery cell and assembly of the present invention;

[0031] Fig. 9 yes Figure 8 A magnified schematic diagram of point B in the middle.

[0032] The accompanying drawings are marked with: 1. positive electrode current collecting plate, 2. assembly, 3. negative electrode current collecting plate, 4. liquid outlet, 5. liquid filling port, 6. bolt, 7. mounting groove one, 8. mounting hole, 9. mounting groove two, 10. bolt hole, 11. extrusion plate, 12. lower conduction block, 13. rubber pressure rod, 14. pleated section, 15. cooling bag, 16. connecting section, 17. bag body, 18. connecting groove, 19. mounting block, 20. spring, 21. abutment plate, 22. battery cell. DETAILED DESCRIPTION

[0033] The following will describe the implementation methods of the present invention in detail with reference to the accompanying drawings and embodiments, so that the implementation process of how the present invention applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0034] In the description of the present invention, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present invention.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Therefore, the definition of "first" and "second" features can explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.

[0036] In the present invention, unless otherwise specified and limited, the terms "assemble", "connect", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can also be a mechanical connection; it can be directly connected, or it can be connected through an intermediate medium, or the two elements can be internally connected. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0038] It should also be understood that the terms used in this description of the embodiments of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the embodiments of the present invention. As used in the description of the embodiments of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms of "a", "an" and "the" are intended to include plural forms.

[0039] Example 1

[0040] The specific embodiment of the present invention is shown in the accompanying drawings, a lithium battery assembly structure includes a positive current collecting plate 1, a negative current collecting plate 3 and a plurality of battery assembly modules; the plurality of battery assembly modules are stacked, and the positive current collecting plate 1 and the negative current collecting plate 3 are respectively installed at the upper end and the lower end of the stacked battery assembly modules;

[0041] The battery assembly module includes an assembly body 2 and a plurality of battery cells 22. The assembly body 2 is vertically provided with a plurality of mounting holes 8 that cooperate with the battery cells 22. A guide pole seat is provided at the bottom of the mounting hole 8. The lower end of the battery cell 22 abuts against the upper end surface of the guide pole seat. The lower end surface of the guide pole seat abuts against the upper end surface of the battery cell 22. The lower end surface of the bottom layer of the reverse current pole seat is connected to the negative electrode collector plate 3. The positive electrode collector plate 1 is connected to the positive electrode of the battery cell 22 in the top layer of the battery assembly module.

[0042] In the above scheme, multiple battery assembly modules are provided, and the multiple battery assembly modules can be stacked and installed, and the upper and lower battery cells are connected through the reverse current pole seat, so welding is not required, avoiding various risks in the welding process.

[0043] As another embodiment of the present invention, the current guide pole seat includes a mounting block 19, an abutment plate 21, a spring 20 and a lower conduction block 12, wherein the mounting block 19 is fixedly mounted at the bottom of the mounting hole 8, the spring 20 and the lower conduction block 12 are respectively mounted on the upper end surface and the lower end surface of the mounting block 19, and the abutment plate 21 is fixedly connected to one end of the spring 20 away from the mounting plate. The lower conduction block 12 is truncated cone-shaped. Further, the abutment plate 21 is adapted to the shape of the mounting hole 8.

[0044] As another embodiment of the present invention, the installation method between the positive current collecting plate 1, the negative current collecting plate 3 and the battery assembly module of the present invention is: axial bolt holes 10 are provided on the positive current collecting plate 1, the negative current collecting plate 3 and the battery assembly module, and bolts 6 are provided in the bolt holes 10.

[0045] Among them, Figure 2 As shown, in order to reasonably utilize the assembly space, the mounting holes 8 are arranged in a circular array in the assembly body 2.

[0046] As another embodiment of the present invention, the assembly structure of the present invention further includes a cooling component, which is installed in the assembly body 2 for cooling the battery cell 22. Further, the cooling component includes a plurality of cooling bags 15 and a plurality of connecting sections 16, wherein the plurality of cooling bags 15 are arranged in a ring array, and the plurality of connecting sections 16 are used to connect two adjacent cooling bags 15, and the assembly body 2 is provided with a plurality of mounting grooves 17 for cooperating with the cooling bags 15 and mounting grooves 29 for cooperating with the connecting sections 16, wherein the mounting grooves 17 are arranged around the mounting hole 8, and the mounting grooves 17 are connected with the mounting hole 8 through the connecting grooves 18. Furthermore, the cooling bag 15 includes a bag body 17 and two rubber pressure rods 13, the rubber pressure rods are adapted to the shape of the mounting groove 7, the two rubber pressure rods 13 are installed at the upper and lower ends of the cooling bag 15, the bag body 17 is made of deformable material, and a pleated section 14 is provided on the end face of the bag body 17 close to the battery cell 22, and the lower end face of the assembly body 2 is provided with an extrusion plate 11 that cooperates with the mounting groove 7. When the upper and lower battery assembly modules are stacked, the extrusion plate 11 on the lower end face of the upper assembly body 2 extends into the mounting groove 7 on the upper end face of the lower assembly body 2 to extrude the rubber pressure rod 13, and the pleated section 14 can be unfolded and tightly attached to the outer circumferential surface of the battery cell 22 after the bag body 17 is compressed.

[0047] Among them, a liquid injection port 5 and a liquid outlet 4 are arranged on the outer circumferential surface of the assembly 2, a liquid injection pipe is arranged in the liquid injection port 5, and a liquid outlet pipe is arranged in the liquid outlet 4. One end of the liquid injection pipe and the liquid outlet pipe are connected with the cooling component, and the ends of the liquid outlet pipe and the liquid injection pipe away from the cooling component are connected with the coolant circulation device. When working, the coolant circulation device injects coolant with a lower temperature into the cooling component through the liquid injection pipe to cool the battery cell. After passing through the cooling component, the coolant in the cooling component flows out from the liquid outlet pipe on the other side and re-enters the coolant circulation device for cooling.

[0048] Those skilled in the art will know that a large amount of heat is generated during the operation of the battery cell. Since the battery cell needs to be cooled, in the existing technical solutions, liquid cooling is usually used to cool the battery cell. A coolant pipe is provided in the installation body of the battery cell. When the coolant flows through the coolant pipe, the heat generated by the battery cell is taken away. However, in order to ensure that the battery cell can be assembled smoothly, there is usually a gap fit between the battery cell and the installation body, that is, there is a gap between the battery cell and the installation body. The thermal conductivity of the air in the gap is poor. Therefore, the effect of the traditional cooling method is not good. In the above scheme, the coolant component is filled with coolant. After the battery cells in the lower assembly body are assembled, the upper assembly body is stacked and installed on the lower assembly body. The extrusion plate at the lower end of the upper assembly body extends into the installation groove 7 on the upper end face of the lower assembly body 2 to extrude the rubber pressure rod 13, and the pleated section 14 After the bag body 17 is compressed, it can unfold and fit tightly against the outer circumference of the battery cell 22. The bag body can directly contact the battery cell for heat dissipation, reducing the intermediate medium and improving the heat dissipation effect. The extrusion plate of this scheme is inserted into the installation groove. On the one hand, it can squeeze the rubber pressure rod so that the bag body can fit tightly against the outer circumference of the battery cell 22. On the other hand, it can provide positioning for the upper layer of assembly and the lower layer of assembly when they are installed, preventing the upper layer of assembly from being stacked and installed on the lower layer of assembly. In addition, when the battery cell is installed, the folds on the bag body are in a contracted state. Therefore, the bag body will not contact the battery cell when the battery cell is installed. Therefore, the battery cell can be installed in the installation hole more smoothly. When the extrusion rod is inserted into the installation groove, the rubber pressure rod is squeezed so that the bag body can fit tightly against the outer circumference of the battery cell 22, and a radial positioning can be provided for the battery cell, thereby improving the stability of the battery cell installation.

[0049] It should be noted that the cooling bag in this solution is made of a flexible material with excellent thermal conductivity, which can take away the heat generated by the battery cell in a timely manner.

[0050] Example 2

[0051] This embodiment discloses an assembly method of a lithium battery assembly structure, which is applied to Embodiment 1. The assembly method comprises the following steps:

[0052] S1. Select the corresponding number of assemblies, battery cells and cooling components as needed, and install the battery cells and cooling components into the assemblies to form a battery assembly module;

[0053] S2, installing the bottom battery assembly module onto the negative electrode current collecting plate, and ensuring that the negative electrode current collecting plate is in conduction with the lower conductive block of the bottom battery assembly module;

[0054] S3, stacking and installing the remaining battery assembly modules in sequence;

[0055] S4, cover the positive electrode current collecting plate onto the uppermost battery assembly module;

[0056] S5. Insert bolts into the bolt holes on the assembly, the negative electrode current collector plate, and the positive electrode current collector plate, and tighten them with nuts.

[0057] The above description is only for the best embodiment of the present invention, but it should not be understood as limiting the claims. The present invention is not limited to the above embodiments, and its specific structure is allowed to be changed. All changes made within the scope of protection of the independent claims of the present invention are within the scope of protection of the present invention.

Claims

1. A lithium battery assembly structure, comprising a positive electrode current collecting plate (1), a negative electrode current collecting plate (3) and a plurality of battery assembly modules; characterized in that: A plurality of the battery assembly modules are stacked, and the positive electrode current collecting plate (1) and the negative electrode current collecting plate (3) are respectively mounted on the upper end and the lower end of the stacked battery assembly modules; The battery assembly module comprises an assembly body (2) and a plurality of battery cells (22); the assembly body (2) is vertically provided with a plurality of mounting holes (8) matched with the battery cells (22); a current guide pole seat is provided at the bottom of the mounting hole (8); the lower end of the battery cell (22) abuts against the upper end surface of the current guide pole seat; the lower end surface of the current guide pole seat abuts against the upper end surface of the battery cell (22); the lower end surface of the bottom backflow pole seat is connected to the negative electrode collector plate (3); and the positive electrode collector plate (1) is connected to the positive electrode of the battery cell (22) in the top battery assembly module.

2. A lithium battery assembly structure according to claim 1, characterized in that: The guide pole seat comprises a mounting block (19), an abutment plate (21), a spring (20) and a lower conduction block (12); the mounting block (19) is fixedly mounted on the bottom of the mounting hole (8); the spring (20) and the lower conduction block (12) are respectively mounted on the upper end surface and the lower end surface of the mounting block (19); the abutment plate (21) is fixedly connected to an end of the spring (20) away from the mounting plate.

3. A lithium battery assembly structure according to claim 2, characterized in that: The lower conductive block (12) is in the shape of a truncated cone.

4. A lithium battery assembly structure according to claim 1, characterized in that: The positive electrode current collecting plate (1), the negative electrode current collecting plate (3) and the battery assembly module are all provided with axial bolt holes (10), and bolts (6) are provided in the bolt holes (10).

5. A lithium battery assembly structure according to claim 1, characterized in that: The mounting holes (8) are arranged in an annular array inside the assembly (2).

6. A lithium battery assembly structure according to claim 5, characterized in that: It also includes a cooling component, which is installed in the assembly (2) and is used to cool the battery core (22).

7. A lithium battery assembly structure according to claim 6, characterized in that: The cooling assembly comprises a plurality of cooling bags (15) and a plurality of connecting sections (16), wherein the plurality of cooling bags (15) are arranged in a ring array, and the plurality of connecting sections (16) are used to connect two adjacent cooling bags (15). The assembly (2) is provided with a plurality of mounting grooves (7) for cooperating with the cooling bags (15) and mounting grooves (9) for cooperating with the connecting sections (16), wherein the mounting grooves (7) are arranged around the mounting holes (8), and the mounting grooves (7) are connected with the mounting holes (8) through the connecting grooves (18).

8. A lithium battery assembly structure according to claim 7, characterized in that: The cooling bag (15) comprises a bag body (17) and two rubber pressure rods (13), wherein the rubber pressure rods are adapted to the shape of the mounting groove (7), and the two rubber pressure rods (13) are mounted at the upper and lower ends of the cooling bag (15). The bag body (17) is made of a deformable material, and a folded section (14) is arranged on the end surface of the bag body (17) close to the battery cell (22). The lower end surface of the assembly body (2) is provided with an extrusion plate (11) that matches the mounting groove (7). When the upper and lower battery assembly modules are stacked, the extrusion plate (11) on the lower end surface of the upper assembly body (2) extends into the mounting groove (7) on the upper end surface of the lower assembly body (2) to extrude the rubber pressure rods (13). After the bag body (17) is compressed, the folded section (14) can be unfolded to be in close contact with the outer circumference of the battery cell (22).

9. A lithium battery assembly structure according to claim 8, characterized in that: The outer circumferential surface of the assembly (2) is provided with a liquid injection port (5) and a liquid outlet port (4), the liquid injection port (5) is provided with a liquid injection pipe, the liquid outlet port (4) is provided with a liquid outlet pipe, one end of the liquid injection pipe and the liquid outlet pipe is connected to the cooling component, and the end of the liquid outlet pipe and the liquid injection pipe away from the cooling component is connected to the coolant circulation device.

10. A method for assembling a lithium battery assembly structure, characterized in that: The assembly method The following steps are included: S1. Select the corresponding number of assemblies, battery cells and cooling components as needed, and install the battery cells and cooling components into the assemblies to form a battery assembly module; S2, installing the bottom battery assembly module onto the negative electrode current collecting plate, and ensuring that the negative electrode current collecting plate is in conduction with the lower conductive block of the bottom battery assembly module; S3, stacking and installing the remaining battery assembly modules in sequence; S4, cover the positive electrode current collecting plate onto the uppermost battery assembly module; S5. Insert bolts into the bolt holes on the assembly, the negative electrode current collector plate, and the positive electrode current collector plate, and tighten them with nuts.

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