Cylindrical power battery pack

Abstract

The utility model discloses a cylindrical power battery pack, which comprises at least two cylindrical power batteries, a winding type water cooling pipe and a shell, the at least two cylindrical power batteries are connected end to end to form a linearly arranged battery series structure, and the winding type water cooling pipe is continuously wound on the circumferential outer wall of each cylindrical power battery of the battery series structure. And the battery series structure wound with the winding type water cooling pipe is arranged in the shell. According to the battery series connection structure, the winding type water cooling pipe can be used for heat transfer to cool each cylindrical power battery, and the arrangement of the winding type water cooling pipe can be used for radially limiting each cylindrical power battery, so that the stability of the battery series connection structure is facilitated, and the battery series connection structure can have better anti-seismic performance.

Description

Technical Field

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

[0002] Cylindrical power batteries such as lithium-ion and sodium-ion are important components in electric vehicles. They have the highest installed capacity in the electric vehicle field due to their advantages such as small size, high energy density and green environmental protection.

[0003] Generally, only one winding core or multiple parallel winding cores are arranged in the shell of a cylindrical power battery, neither of which can achieve battery voltage boosting. When the module is assembled into a vehicle, the battery pack needs to have a higher voltage, that is, more single cells can only be connected in series to form a battery pack, and the adjacent batteries are connected by another conductive structure, resulting in high cost, heavy weight, and large volume. The newly emerged cylindrical power batteries are connected end to end to form a linearly arranged battery series structure, which can simplify battery assembly, but it puts forward requirements for limiting the cylindrical power batteries to each other and improving seismic resistance. It is not easy to ensure the limiting effect by simply using the connection structure between the cylindrical power batteries for limiting, and there is currently no cooling solution specifically for the battery series structure. Therefore, it is necessary to provide a technical solution that can improve the limiting effect of the battery series structure and can cool the battery series structure. Utility Model Content

[0004] The utility model aims to provide a cylindrical power battery pack, which can improve the limiting effect of the battery series structure and can cool the battery series structure.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a cylindrical power battery pack, comprising at least two cylindrical power batteries, a wound water-cooling tube and a shell, wherein the at least two cylindrical power batteries are connected end to end to form a linearly arranged battery series structure, the wound water-cooling tube is continuously wound around the circumferential outer wall of each cylindrical power battery in the battery series structure, and the battery series structure wound with the wound water-cooling tube is arranged in the shell.

[0006] Optionally, both ends of the wound water-cooling tube are respectively connected with sealing adapters, and the sealing adapters pass through the outer shell outwards.

[0007] Optionally, the outer shell includes a tubular shell and two top covers, the two top covers are respectively covered on two open ends of the tubular shell, and the sealing adapters connected to both ends of the wound water-cooling tube are respectively passed outward from the two top covers.

[0008] Optionally, the inner wall of the shell is attached to the outer side of the wound water-cooling tube.

[0009] Optionally, the wrapped water-cooling tube is a flat water-cooling tube, the inner side surface of the wrapped water-cooling tube defines an inner cylindrical surface, the outer side surface of the wrapped water-cooling tube defines an outer cylindrical surface, the inner cylindrical surface is in contact with the circumferential outer wall of each of the cylindrical power batteries, and the outer cylindrical surface is in contact with the inner wall of the outer shell.

[0010] Optionally, the outer shell includes a tubular shell and two top covers, the two top covers are respectively covered with two open ends of the tubular shell, the top covers are provided with one of a plug structure and a slot structure, and the end of the cylindrical power battery adjacent to the top cover facing the top cover is provided with the other of the plug structure and the slot structure, and the plug structure and the slot structure are buckled together.

[0011] Optionally, the plug structure or the slot structure provided on the top cover includes a base plate portion fixed in the middle of the top cover, the base plate portion protrudes inwardly to form a plug-in portion for snap-fitting, and the base plate portion is exposed on the outside of the top cover and is configured to be electrically connected to an external device.

[0012] In the embodiment of the utility model, a wound water-cooling tube is continuously wound around the circumferential outer wall of each cylindrical power battery in the battery series structure, and the wound water-cooling tube can be used to transfer heat to cool each cylindrical power battery. Moreover, the arrangement of the wound water-cooling tube can radially limit each cylindrical power battery, which is beneficial to the stability of the battery series structure, so that the battery series structure can have better seismic resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the three-dimensional structure of a cylindrical power battery pack according to an embodiment of the utility model.

[0014] Figure 2 This is a schematic diagram of the exploded structure of a cylindrical power battery pack according to an embodiment of the present utility model.

[0015] Figure 3 yes Figure 1 Section view along line AA.

[0016] Figure 4 It is a schematic diagram of the exploded structure of a battery series structure including two power batteries in an embodiment of the utility model.

[0017] Figure 5 It is a three-dimensional structural schematic diagram of a power battery, a first plug structure and a first slot structure according to an embodiment of the utility model.

[0018] Figure 6 It is a three-dimensional structural schematic diagram of the first plug structure of an embodiment of the utility model.

[0019] Figure 7It is a three-dimensional structural schematic diagram of the first slot structure of an embodiment of the utility model.

[0020] Figure 8 It is a three-dimensional structural schematic diagram of the top cover and the first plug structure (pole) of the embodiment of the utility model.

[0021] Fig. 9 yes Figure 8 Schematic diagram of the three-dimensional structure of the first plug structure (pole).

[0022] Fig.10 It is a three-dimensional structural schematic diagram of the top cover and the first slot structure (pole) of the embodiment of the utility model.

[0023] Fig.11 yes Fig.10 Schematic diagram of the three-dimensional structure of the first slot structure (pole). DETAILED DESCRIPTION

[0024] In order to explain the technical content, structural features and effects achieved by the present invention in detail, the following is a detailed description in conjunction with the implementation modes and the accompanying drawings.

[0025] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0026] See also Figures 1 to 3 The embodiment of the utility model discloses a cylindrical power battery pack, including at least two cylindrical power batteries 1, a wound water-cooling tube 4 and a shell. At least two cylindrical power batteries 1 are connected end to end to form a linearly arranged battery series structure. The wound water-cooling tube 4 is continuously wound around the circumferential outer wall of each cylindrical power battery 1 in the battery series structure. The battery series structure wound with the wound water-cooling tube 4 is arranged in the shell 5.

[0027] In the embodiment of the utility model, a wound water-cooling tube 4 is continuously wound around the circumferential outer wall of each cylindrical power battery 1 in the battery series structure, and the wound water-cooling tube 4 can be used to transfer heat to cool each cylindrical power battery 1. Moreover, the provision of the wound water-cooling tube 4 can radially limit each cylindrical power battery 1, which is beneficial to the stability of the battery series structure, so that the battery series structure can have better anti-seismic performance.

[0028] In some embodiments, both ends of the wound water-cooling tube 4 are respectively connected with sealing adapters 41, and the sealing adapters 41 pass outward through the housing 5. Since both ends of the wound water-cooling tube 4 are respectively connected with sealing adapters 41 passing outward from the housing 5, it is convenient to communicate with the external pipeline to realize the flow of cooling medium.

[0029] Specifically, the housing 5 includes a tubular shell 51 and two top covers 52 . The two top covers 52 are respectively disposed on two open ends of the tubular shell 51 . The sealing adapters 41 connected to both ends of the wound water-cooling tube 4 are respectively passed outward from the two top covers 52 .

[0030] In some embodiments, the inner wall of the shell 5 is attached to the outside of the wound water-cooling tube 4, which can limit the wound water-cooling tube 4 and the battery series structure, which is beneficial to the structural stability of the cylindrical power battery pack.

[0031] In some embodiments, the wound water-cooling tube 4 is a flat water-cooling tube, the inner side of the wound water-cooling tube 4 defines an inner cylindrical surface, the outer side of the wound water-cooling tube 4 defines an outer cylindrical surface, the inner cylindrical surface is in contact with the circumferential outer wall of each cylindrical power battery 1, and the outer cylindrical surface is in contact with the inner wall of the outer shell 5. Since the wound water-cooling tube 4 is a flat water-cooling tube, it can avoid occupying too much space, which is conducive to the compact structure of the cylindrical power battery pack, and the inner cylindrical surface defined by the inner side of the wound water-cooling tube 4 is in contact with the circumferential outer wall of each cylindrical power battery 1, and the outer cylindrical surface defined by the outer side of the wound water-cooling tube 4 is in contact with the inner wall of the outer shell 5, which is conducive to improving the overall stability of the cylindrical power battery pack.

[0032] Specifically, the inner wall of the outer shell 5 is the inner wall of the tubular housing 51 .

[0033] See also Figures 3 to 11 In some embodiments, the first plug structure 2 and the first slot structure 3 that are mutually engaged and electrically connected are respectively provided at opposite ends of each of the two adjacent cylindrical power batteries 1, and the two adjacent cylindrical power batteries 1 are connected in series by the engagement and electrical connection of the first plug structure 2 and the first slot structure 3. In other words, the first plug structure 2 and the first slot structure 3 not only play the role of mechanically connecting the adjacent cylindrical power batteries 1, but also play the role of electrically connecting the adjacent cylindrical power batteries 1.

[0034] Since each adjacent two cylindrical power batteries 1 are connected in series with each other through the buckling of the first plug structure 2 and the first slot structure 3, the cylindrical power batteries 1 are connected in series in sequence. Moreover, based on the buckling of the first plug structure 2 and the first slot structure 3, the series assembly of the cylindrical power batteries 1 can be quickly realized. In addition, based on the buckling of each pair of the first plug structure 2 and the first slot structure 3 and the limiting of the battery series structure by the winding water cooling tube 4, the battery series structure has good stability and shock resistance. Of course, the cylindrical power batteries 1 are not limited to being connected in series with each other through the buckling of the first plug structure 2 and the first slot structure 3.

[0035] Specifically, the first plug structure 2 is formed by integrally processing a metal part.

[0036] Specifically, the first slot structure 3 is formed by integrally processing a metal piece.

[0037] See also Figures 3 to 11 Specifically, the first plug structure 2 includes a plug portion 22, and the middle parts of the opposite side walls of the plug portion 22 are respectively arched outward to form a locking protrusion 23. The first slot structure 3 includes a slot portion 32, and the slot portion 32 is provided with a slot 321. The middle parts of the opposite side walls of the slot 321 are respectively recessed outward with a locking groove 322. The plug portion 22 is inserted into the slot 321, and the locking protrusions 23 are respectively locked in the corresponding locking grooves 322, thereby realizing the mutual engagement and electrical connection between the first plug structure 2 and the first slot structure 3. When the plug part 22 is inserted into the slot 321, the front end of the plug part 22 is first inserted into the entrance end of the slot 321, and then the two side protrusions 23 press the two side walls of the slot 321 outward and slide into the slot 321. When the plug part 22 is inserted into place, the protrusions 23 on both sides of the plug part 22 are respectively inserted into the grooves 322 on both sides of the slot 321, so that the plug part 22 is buckled in the slot 321, thereby realizing the stable combination and electrical connection of the first plug structure 2 and the first slot structure 3.

[0038] The first plug structure 2 can be integrally formed on the corresponding structure of the cylindrical power battery 1, or can be fixedly arranged on the corresponding structure of the cylindrical power battery 1. Similarly, the first slot structure 3 can be integrally formed on the corresponding structure of the cylindrical power battery 1, or can be fixedly arranged on the corresponding structure of the cylindrical power battery 1. In addition, the utility model does not impose any specific restrictions on the specific structural form of the cylindrical power battery 1 and the specific structure of the first plug structure 2 / first slot structure 3, as long as the series connection between the cylindrical power batteries 1 can be achieved based on the first plug structure 2 and the first slot structure 3.

[0039] A common structural form of a cylindrical power battery 1 includes a shell 11 and a top cover 12. A winding core 13 and other structures are provided in the shell 11. A pole 14 is provided on the top cover 12 or the shell bottom 111 of the shell 11. Of course, it is not excluded that both the shell bottom 111 and the top cover 52 are provided with poles or that neither of them is provided with poles. In addition, the cylindrical power battery 1 is not limited to the form of a shell 11 plus a top cover 12. It is not excluded that both ends are provided with covers, and one of the two covers is provided with poles. Of course, it is also excluded that both covers are provided with poles or that neither of them is provided with poles. Based on different embodiments, the first plug structure 2 / first slot structure 3 can be provided on the pole, the top cover, the shell bottom, the cover, etc.

[0040] See also Figures 3 to 7 In some embodiments, the cylindrical power battery 1 is provided with a pole 14, on which a first plug structure 2 or a first slot structure 3 is fixed and electrically connected, and can be fixed on the pole 14 by laser welding.

[0041] exist Figures 3 to 5 In the embodiment shown, a pole 14 is provided at one end of the cylindrical power battery 1, and a first plug structure 2 is fixed and electrically connected to the pole 14. Specifically, in this embodiment, the pole 14 is formed on the top cover 12, but it is not limited thereto.

[0042] Please combine Figure 6 Specifically, the first plug structure 2 fixed on the pole 14 includes a base plate portion 21, a plug portion 22 protrudes from the middle of the base plate portion 21, and the base plate portion 21 is fixed to the end surface of the pole 14. The first plug structure 2 is buckled with the first slot structure 3 through the plug portion 22.

[0043] In different embodiments, a pole 14 is provided at one end of the cylindrical power battery 1, and the first slot structure 3 can be fixed and electrically connected to the pole 14. Specifically, the pole 14 can be formed on the top cover 12, but it is not limited thereto.

[0044] Please combine Figure 7 Specifically, the first slot structure 3 fixed on the pole 14 includes a base plate portion 31, the middle portion of the base plate portion 31 protrudes out of the slot portion 32, and the base plate portion 31 can be fitted and fixed on the end surface of the pole 14. The first slot structure 3 is buckled with the first plug structure 2 through the slot portion 32.

[0045] See also Figures 8 to 11 In some embodiments, the cylindrical power battery 1 is provided with a pole 14, which forms the base of the first plug structure 2 or the first slot structure 3, and a plug-in portion protrudes from the pole 14. For the first plug structure 2, the plug-in portion is a plug portion 22 (such as Fig. 9 As shown), for the first slot structure 3, the plug-in portion is the slot portion 32 (as shown Fig.11). The first plug structure 2 is buckled with the first slot structure 3 through the plug portion 22, and the first slot structure 3 is buckled with the first plug structure 2 through the slot portion 32. Specifically, the pole 14 can be fixed to the top cover 52 by riveting, and of course, in different embodiments, it can also be fixed to the shell bottom 111, etc.

[0046] See also Figures 3 to 7 In some embodiments, a pole 14 is provided at one end of the cylindrical power battery 1, and a first plug structure 2 or a first slot structure 3 is fixed and electrically connected to the shell bottom 111 of the other end of the cylindrical power battery 1, and the first plug structure 2 or the first slot structure 3 can be fixed to the shell bottom 111 by laser welding. Of course, the other end of the cylindrical power battery 1 is not necessarily the shell bottom 111, but can also be a cover, in which case the first plug structure 2 or the first slot structure 3 can be fixed to the cover.

[0047] Specifically, the pole 14 can be arranged on the top cover 12 (the cover at the other end when one end is the shell bottom 111), and the shell bottom 111 at the other end of the cylindrical power battery 1 is fixed and electrically connected to the first plug structure 2 or the first slot structure 3 (such as Figure 5 As shown). The pole 14 can be arranged on the shell bottom 111, and the top cover 12 at the other end of the cylindrical power battery 1 is fixed and electrically connected to the first plug structure 2 or the first slot structure 3. When a cover is provided at both ends of the cylindrical power battery 1, the pole 14 can be arranged on one of the covers, and the cover at the other end of the cylindrical power battery 1 is fixed and electrically connected to the first plug structure 2 or the first slot structure 3. Of course, when the first plug structure 2 or the first slot structure 3 is arranged on the shell bottom 111 or the cover, it is not limited to the method of fixed connection, and it does not exclude that it is arranged on the shell bottom 111 or the cover in other ways.

[0048] Specifically, the first plug structure 2 fixed on the shell bottom 111 or the cover may include a base plate portion 21, the middle portion of the base plate portion 21 protrudes out of the plug portion 22, the base plate portion 21 is fitted and fixed to the outer surface of the shell bottom 111 or the cover, and the first plug structure 2 is buckled with the first slot structure 3 through the plug portion 22. It can be understood that each first plug structure 2 in the utility model can be exactly the same.

[0049] Specifically, the first slot structure 3 fixed on the shell bottom 111 or the cover body may include a base plate portion 31, the middle portion of the base plate portion 31 protrudes out of the slot portion 32, the base plate portion 31 is fitted and fixed to the outer surface of the shell bottom 111 or the cover body, and the first slot structure 3 is buckled with the first plug structure 2 through the slot portion 32. It can be understood that each first slot structure 3 in the present utility model can be exactly the same.

[0050] It can be understood that the arrangement positions of the first plug structure 2 and the first slot structure 3 can be interchanged.

[0051] See also Figures 1 to 3 In some embodiments, the housing 5 includes a tubular housing 51 and two top covers 52. The two top covers 52 are respectively provided at the two open ends of the tubular housing 51. The top cover 52 is provided with one of the second plug structure 6 and the second slot structure 7. The cylindrical power battery 1 adjacent to the top cover 52 is provided with the other of the second plug structure 6 and the second slot structure 7 at one end facing the top cover 52. The second plug structure 6 and the second slot structure 7 are buckled. The buckling of one of the second plug structure 6 and the second slot structure 7 provided on the top covers 52 at both ends with the other of the second plug structure 6 and the second slot structure 7 provided on the adjacent cylindrical power battery 1 is conducive to the structural stability of the cylindrical power battery pack.

[0052] Specifically, the second plug structure 6 or the second slot structure 7 provided on the top cover 52 includes a base plate portion 61 / 71 fixed in the middle of the top cover 52, the base plate portion 61 / 71 protrudes inwardly to a plug-in portion for buckling, and the base plate portion 61 / 71 is exposed outside the top cover 52 and is configured to be electrically connected to an external device. Of course, the cylindrical power battery pack is not limited to being electrically connected to an external device through the second plug structure 6 / second slot structure 7, and when being electrically connected to an external device through the second plug structure 6 / second slot structure 7, it is not limited to having the above-mentioned structural form and being electrically connected to an external device in the above-mentioned manner.

[0053] exist Figure 3 In the embodiment, one of the top covers 52 is provided with a second plug structure 6, and the corresponding plug-in portion is a plug portion 62, and the second plug structure 6 is buckled with the second slot structure 7 through the plug portion 62. The other top cover 52 is provided with a second slot structure 7, and the corresponding plug-in portion is a slot portion 72, and the second slot structure 7 is buckled with the second plug structure 6 through the slot portion 72.

[0054] Regarding how to set the second plug structure 6 / second slot structure 7 on the cylindrical power battery 1, reference may be made to the setting method of the first plug structure 2 / first slot structure 3 on the cylindrical power battery 1, which will not be repeated here.

[0055] The second plug structure 6 and the first plug structure 2 may be completely identical, and the second slot structure 7 and the first slot structure 3 may be completely identical.

[0056] The above disclosure is only a preferred example of the present invention, and its role is to facilitate the technical personnel in this field to understand and implement it. Of course, it cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the scope covered by the present invention.

Claims

1. A cylindrical power battery pack, characterized in that: The invention comprises at least two cylindrical power batteries, a wound water-cooling tube and a shell. The at least two cylindrical power batteries are connected end to end to form a linearly arranged battery series structure. The wound water-cooling tube is continuously wound around the circumferential outer wall of each cylindrical power battery in the battery series structure. The battery series structure wound with the wound water-cooling tube is arranged in the shell.

2. The cylindrical power battery pack according to claim 1, characterized in that: Both ends of the winding water-cooling pipe are respectively connected with sealing adapters, and the sealing adapters pass through the outer shell outwards.

3. The cylindrical power battery pack according to claim 2, characterized in that: The shell includes a tubular shell and two top covers, the two top covers are respectively arranged to cover the two open ends of the tubular shell, and the sealing adapters connected to the two ends of the winding water-cooling tube are respectively passed outward from the two top covers.

4. The cylindrical power battery pack according to claim 1, characterized in that: The inner wall of the shell is attached to the outer side of the wound water-cooling tube.

5. The cylindrical power battery pack according to claim 1, characterized in that: The wrapped water-cooling tube is a flat water-cooling tube, the inner side surface of the wrapped water-cooling tube defines an inner cylindrical surface, the outer side surface of the wrapped water-cooling tube defines an outer cylindrical surface, the inner cylindrical surface is in contact with the circumferential outer wall of each of the cylindrical power batteries, and the outer cylindrical surface is in contact with the inner wall of the outer shell.

6. The cylindrical power battery pack according to claim 1, characterized in that: The shell includes a tubular shell and two top covers, the two top covers are respectively covered on the two open ends of the tubular shell, one of a plug structure and a slot structure is provided on the top cover, and the other of the plug structure and the slot structure is provided on the end of the cylindrical power battery adjacent to the top cover facing the top cover, and the plug structure and the slot structure are buckled.

7. The cylindrical power battery pack according to claim 6, characterized in that: The plug structure or the slot structure provided on the top cover includes a base plate portion fixed to the middle of the top cover, the base plate portion protrudes inwardly to form a plug-in portion for buckling, and the base plate portion is exposed outside the top cover and is configured to be electrically connected to an external device.

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