Power battery unit, power battery series structure and battery pack

Abstract

The utility model discloses a power battery unit, a power battery series connection structure and a battery pack, the power battery series connection structure comprises at least two power batteries which are connected end to end for series connection, and the opposite end parts of every two adjacent power batteries are respectively provided with a first plug structure and a first slot structure; and two adjacent power batteries are connected in series by buckling and electrically connecting the first plug structure and the first slot structure. According to the utility model, the power batteries are limited by buckling the plug structure and the slot structure, so that the serial connection structure of the power batteries has better stability and shock resistance.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a power battery unit, a power battery series structure and a battery pack. Background Art

[0002] Currently, lithium-ion / sodium-ion power batteries have gradually become mainstream products in the new energy industry due to their high energy density, good capacity consistency, and ability to support high-rate charge and discharge. They account for the largest installed capacity in the new energy vehicle sector. However, they face the following common problems:

[0003] When new energy vehicles are assembled, the battery packs need to have a higher voltage. Generally, a large number of single power batteries are connected in series to form a battery pack to achieve high voltage. In a current series-connected power battery structure, in addition to requiring a conductive structure to connect two adjacent power batteries in series, a special limiting structure is also required to ensure that the connection between the power batteries remains stable and shock-resistant. In other words, the conductive structure of the existing series-connected power battery structure makes it difficult to limit the position of the power batteries connected in series. Furthermore, the need to assemble both the conductive structure and the limiting structure simultaneously complicates the battery assembly process, affecting assembly efficiency. Utility Model Content

[0004] The purpose of the present invention is to provide a power battery unit, a power battery series structure and a battery pack, which can solve at least one technical problem existing in the above-mentioned background technology.

[0005] To achieve the above-mentioned objectives, the present invention provides a power battery unit, including a power battery, wherein the two ends of the power battery are respectively provided with a plug structure and a slot structure for being connected in series with other power batteries, the plug structure is used to snap together and be electrically connected with the slot structure of the other power battery, and the slot structure is used to snap together and be electrically connected with the plug structure of the other power battery.

[0006] In the embodiment of the present invention, a plug structure and a slot structure are provided at each end of the power battery. The power batteries can be connected in series by engaging and electrically connecting the plug structure with the slot structure of another power battery, and vice versa. In other words, in addition to utilizing the plug structure and slot structure to connect the power batteries in series, the present embodiment can also utilize the engagement of the plug structure / slot structure with the slot structure / plug structure of another power battery to limit the position of the power batteries. This ensures a certain degree of stability and shock resistance in the series connection of the power batteries without requiring a dedicated position-limiting structure. Furthermore, the present embodiment can achieve series assembly of the power batteries by engaging the plug structure and slot structure between the power batteries, facilitating rapid assembly.

[0007] Optionally, the plug structure includes a plug portion, the middle portions of opposite side walls of the plug portion are respectively arched outward to form a locking protrusion, and the slot structure includes a slot, the middle portions of opposite side walls of the slot are respectively concave outward to form a locking groove.

[0008] Optionally, the power battery is provided with a pole, and the plug structure or the slot structure is fixed on and electrically connected to the pole.

[0009] Optionally, the plug structure or the slot structure fixed on the pole includes a base plate portion, a middle portion of the base plate portion protrudes out of the plug-in portion, and the base plate portion is fitted and fixed to the end face of the pole.

[0010] Optionally, the power battery is provided with a pole, the pole forming a base of the plug structure or the slot structure, and a plug-in portion protrudes integrally from the pole.

[0011] Optionally, the pole is provided at one end of the power battery, and the plug structure or the slot structure is fixed to and electrically connected to the shell bottom or cover of the other end of the power battery.

[0012] Optionally, the plug structure and the slot structure are formed by integrally processing a metal part.

[0013] To achieve the above-mentioned objectives, the present invention also provides a power battery series structure, comprising at least two power batteries connected end to end in series, wherein the opposite ends of each two adjacent power batteries are respectively provided with a first plug structure and a first slot structure, and the series connection of the two adjacent power batteries is achieved by the snap-fit ​​and electrical connection of the first plug structure and the first slot structure.

[0014] In the power battery series structure of the embodiment of the present invention, a first plug structure and a first slot structure are respectively provided at the opposite ends of each two adjacent power batteries. The first plug structure and the first slot structure engage and electrically connect to achieve the series connection of the two adjacent power batteries. In other words, in addition to utilizing the plug structure and the slot structure to achieve series connection of the power batteries, the embodiment of the present invention also utilizes the engagement of the plug structure and the slot structure to limit the position of the power batteries. This ensures a certain degree of stability and shock resistance in the series power battery structure without the need for a dedicated position-limiting structure. Furthermore, the embodiment of the present invention achieves series assembly of the power batteries by engaging the plug structure and the slot structure between the power batteries, facilitating rapid assembly.

[0015] Optionally, the power battery is provided with a pole, and the first plug structure or the first slot structure is fixed on and electrically connected to the pole.

[0016] Optionally, the first plug structure or the first slot structure fixed on the pole includes a first base plate portion, a middle portion of the first base plate portion protrudes out of the first plug portion, and the first base plate portion is fitted and fixed to the end surface of the pole.

[0017] Optionally, the power battery is provided with a pole, the pole forming a base of the first plug structure or the first slot structure, and a plug-in portion protrudes integrally from the pole.

[0018] Optionally, the pole is provided at one end of the power battery, and the first plug structure or the first slot structure is fixed to and electrically connected to the shell bottom or cover of the other end of the power battery.

[0019] Optionally, the first plug structure or the first slot structure fixed on the shell bottom or the cover body includes a second substrate portion, the middle portion of the second substrate portion protrudes out of the second plug-in portion, and the second substrate portion is adhered and fixed to the outer surface of the shell bottom or the cover body.

[0020] Optionally, the first plug structure includes a plug part, and the middle parts of the opposite side walls of the plug part are respectively arched outward to form a locking protrusion. The first slot structure includes a slot, and the middle parts of the opposite side walls of the slot are respectively recessed outward with a locking groove. The plug part is inserted into the slot, and the locking protrusions are respectively locked in the corresponding slots.

[0021] Optionally, the first plug structure and the first slot structure are formed by integrally processing a metal part.

[0022] Optionally, the power battery is a cylindrical power battery.

[0023] Optionally, it further includes a winding water cooling pipe, which is continuously wound around the circumferential outer wall of each of the power batteries connected end to end.

[0024] To achieve the above-mentioned object, the present invention further provides a battery pack, which includes a shell and the power battery series structure as described above, wherein the power battery series structure is arranged on the shell.

[0025] In the power battery series structure of the battery pack of the present embodiment of the utility model, a first plug structure and a first slot structure are respectively provided at the opposite ends of each two adjacent power batteries. The first plug structure and the first slot structure are engaged and electrically connected to achieve the series connection of the two adjacent power batteries. In other words, in addition to utilizing the plug structure and the slot structure to achieve the series connection of the power batteries, the present embodiment of the utility model can also utilize the engagement of the plug structure and the slot structure to limit the position of the power batteries, thereby improving the stability and shock resistance of the battery pack. Furthermore, the present embodiment of the utility model can achieve the series assembly of the power batteries by engaging the plug structure and the slot structure between the power batteries, which facilitates rapid assembly.

[0026] Optionally, the outer 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, the top cover is provided with one of a second plug structure and a second slot structure, and the end of the power battery adjacent to the top cover facing the top cover is provided with the other of the second plug structure and the second slot structure, and the second plug structure and the second slot structure are buckled together.

[0027] Optionally, the second plug structure or second slot structure provided on the top cover includes a third substrate portion fixed in the middle of the top cover, the third substrate portion protruding inwardly to form a plug-in portion for snap-fitting, and the third substrate portion is exposed on the outside of the top cover and is configured to be electrically connected to an external device. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the three-dimensional structure of the power battery unit of an embodiment of the present utility model.

[0029] Figure 2 It is a three-dimensional structural diagram of the plug structure of an embodiment of the utility model.

[0030] Figure 3 It is a three-dimensional structural diagram of the slot structure of an embodiment of the utility model.

[0031] Figure 4 It is a schematic diagram of the exploded structure of a power battery series structure including three power batteries in an embodiment of the present invention.

[0032] Figure 5 It is a three-dimensional structural diagram of the top cover and plug structure (pole) of an embodiment of the utility model.

[0033] Figure 6 yes Figure 5 Schematic diagram of the three-dimensional structure of the plug structure (pole).

[0034] Figure 7It is a three-dimensional structural diagram of the top cover and slot structure (pole) of an embodiment of the utility model.

[0035] Figure 8 yes Figure 7 Schematic diagram of the three-dimensional structure of the middle slot structure (pole).

[0036] Figure 9 It is a schematic diagram of the exploded structure of the battery pack according to an embodiment of the present invention.

[0037] Figure 10 A schematic diagram of the three-dimensional structure of a battery pack according to an embodiment of the present invention.

[0038] Figure 11 yes Figure 10 Schematic diagram of the exploded structure of the battery pack.

[0039] Figure 12 yes Figure 10 Sectional view along line AA. DETAILED DESCRIPTION

[0040] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of specific embodiments of the present invention is provided in conjunction with the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0041] Example 1

[0042] See also Figures 1 to 8 The utility model discloses a power battery unit. The two ends of the power battery 1 are respectively provided with a first plug structure 2 and a first slot structure 3 for connecting in series with other power batteries 1. The plug structure is used to snap together and electrically connect with the first slot structure 3 of the other power battery 1, and the first slot structure 3 is used to snap together and electrically connect with the first plug structure 2 of the other power battery.

[0043] In the embodiment of the present invention, a plug structure 2 and a slot structure 3 are respectively provided at both ends of the power battery 1. The power batteries can be connected in series by engaging and electrically connecting the plug structure 2 with the slot structure 3 of another power battery, and vice versa. In other words, in addition to utilizing the plug structure 2 and slot structure 3 to connect the power batteries 1 in series, the embodiment of the present invention can also utilize the engagement of the plug structure 2 / slot structure 3 with the slot structure 3 / plug structure 2 of another power battery to limit the position of the power batteries 1. This ensures a certain degree of stability and shock resistance in the series connection of the power batteries without requiring a dedicated position-limiting structure. Furthermore, the embodiment of the present invention can achieve series assembly of the power batteries 1 by engaging the plug structure 2 and slot structure 3 between the power batteries 1, facilitating rapid assembly.

[0044] In some embodiments, the first plug structure 2 includes a plug portion 22, with the middle portions of opposing side walls of the plug portion 22 arching outward to form latching protrusions 23. The first slot structure 3 includes a slot portion 32, which includes a slot 321. The middle portions of opposing side walls of the slot 321 each have latching grooves 322 recessed outwardly. When the power batteries 1 are connected in series, the plug portion 22 can be inserted into the corresponding slot 321, with the latching protrusions 23 latching into the corresponding latching grooves 322. When the plug portion 22 is inserted into the slot 321, the front end of the plug portion 22 first inserts into the entrance of the slot 321. Then, the latching protrusions 23 on both sides of the plug portion 22 slide into the slot 321 while pressing outward against the side walls of the slot 321. When the plug portion 22 is fully inserted, the latching protrusions 23 on both sides of the plug portion 22 latch into the latching grooves 322 on both sides of the slot 321, respectively, securing the plug portion 22 within the slot 321, thereby achieving a secure connection and electrical connection between the first plug structure 2 and the first slot structure 3.

[0045] The first plug structure 2 can be integrally formed with the corresponding structure of the power battery 1 or fixedly installed on the corresponding structure of the power battery 1. Similarly, the first slot structure 3 can be integrally formed with the corresponding structure of the power battery 1 or fixedly installed on the corresponding structure of the power battery 1. In addition, the present invention does not impose any specific restrictions on the specific structure of the power battery 1 or the specific configuration of the first plug structure 2 / first slot structure 3. As long as the first plug structure 2 and the first slot structure 3 can achieve series connection between the power batteries 1, it is sufficient.

[0046] A common structure of a 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 (such as a pole) is provided on the top cover 12 or the bottom 111 of the shell 11. Figure 12As shown). Of course, it is not excluded that both the bottom 111 and the top cover 52 are provided with terminals, or that neither is provided with terminals. Furthermore, the power battery is not limited to the form of a housing 11 plus a top cover 12. For example, it is not excluded that both ends are provided with a cover, and one of the two covers is provided with a terminal. Of course, it is also excluded that both covers are provided with terminals, or that neither is provided with a terminal. Based on different embodiments, the first plug structure 2 / first slot structure 3 can be provided on a terminal, the top cover, the bottom, the cover, etc.

[0047] See also Figures 1 to 4 In some embodiments, the 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 to the pole 14 by laser welding.

[0048] exist Figure 1 In the example shown, one end of the power battery 1 is provided with a pole 14, to which the first plug structure 2 is fixed and electrically connected. Specifically, in this embodiment, the pole 14 is formed on the top cover 12, but this is not limiting.

[0049] Please combine Figure 2 Specifically, the first plug structure 2 fixed to the pole 14 includes a base portion 21, a plug portion 22 protruding from the middle of the base portion 21, and the base portion 21 is fixed to the end surface of the pole 14. The first plug structure 2 is engaged with the first slot structure 3 through the plug portion 22.

[0050] In different embodiments, a pole 14 is provided at one end of the 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 is not limited thereto.

[0051] Please combine Figure 3 Specifically, the first slot structure 3 fixed to the pole 14 includes a base portion 31, the middle portion of which protrudes into a slot portion 32. The base portion 31 can be fixed to the end surface of the pole 14. The first slot structure 3 is engaged with the first plug structure 2 via the slot portion 32.

[0052] See also Figures 5 to 8 In some embodiments, the 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. The pole 14 integrally protrudes out from the plug portion. For the first plug structure 2, the plug portion is the plug portion 22 (e.g., Figure 6 As shown), for the first slot structure 3, the plug-in portion is the slot portion 32 (as shown Figure 8(As shown). The first plug structure 2 is engaged with the first slot structure 3 via the plug portion 22, and the first slot structure 3 is engaged with the first plug structure 2 via the slot portion 32. Specifically, the pole 14 can be fixed to the top cover 52 by riveting. Of course, in different embodiments, it can also be fixed to the shell bottom 111, etc.

[0053] See also Figures 1 to 3 In some embodiments, a terminal 14 is provided at one end of the power battery 1, and a first plug structure 2 or a first slot structure 3 is fixed to and electrically connected to the bottom 111 of the housing at the other end of the power battery 1. The first plug structure 2 or the first slot structure 3 can be fixed to the bottom 111 by laser welding. Of course, the other end of the power battery 1 does not necessarily have to be the bottom 111; it can also be a cover. In this case, the first plug structure 2 or the first slot structure 3 can be fixed to the cover.

[0054] Specifically, the pole 14 can be set on the top cover 12 (the cover at the other end when one end is the shell bottom 111). At this time, the shell bottom 111 at the other end of the power battery 1 is fixed and electrically connected to the first plug structure 2 or the first slot structure 3 (such as Figure 1 (As shown). The terminal 14 can be mounted on the housing bottom 111, while the top cover 12 at the other end of the power battery 1 is fixed and electrically connected to the first plug structure 2 or the first slot structure 3. If a cover is provided at both ends of the power battery 1, the terminal 14 can be mounted on one of the covers, while the cover at the other end of the 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 mounted on the housing bottom 111 or the cover, this is not limited to being fixedly connected, and other methods of mounting the first plug structure 2 or the first slot structure 3 on the housing bottom 111 or the cover are not excluded.

[0055] Specifically, the first plug structure 2 fixed to the housing bottom 111 or the cover can include a base portion 21, with a plug portion 22 protruding from the middle of the base portion 21. The base portion 21 is fixed to the outer surface of the housing bottom 111 or the cover, and the first plug structure 2 is engaged with the first slot structure 3 via the plug portion 22. It is understood that each first plug structure 2 in the present invention can be identical.

[0056] Specifically, the first slot structure 3 fixed to the housing bottom 111 or the cover can include a base portion 31, with a central portion of the base portion 31 extending outwardly from a slot portion 32. The base portion 31 is fixedly attached to the outer surface of the housing bottom 111 or the cover, and the first slot structure 3 is engaged with the first plug structure 2 via the slot portion 32. It is understood that all first slot structures 3 in the present invention can be identical.

[0057] It is understandable that the arrangement positions of the first plug structure 2 and the first slot structure 3 can be interchanged.

[0058] Specifically, the first plug structure 2 is formed by integrally processing a metal piece.

[0059] Specifically, the first slot structure 3 is formed by integrally processing a metal piece.

[0060] In some embodiments, the power battery 1 is a cylindrical power battery.

[0061] Example 2

[0062] See also Figures 1 to 12 The present invention discloses a power battery series structure, comprising at least two power batteries 1 connected end-to-end in series. Opposite ends of each pair of adjacent power batteries 1 are provided with a first plug structure 2 and a first slot structure 3, respectively. The first plug structure 2 and the first slot structure 3 engage and electrically connect the two adjacent power batteries 1, thereby achieving the series connection. It should be noted that the power battery series structure is not limited to comprising only two power batteries; it may comprise three, four, or other power batteries.

[0063] In the power battery series structure of the embodiment of the present invention, a first plug structure 2 and a first slot structure 3 are respectively provided at the opposite ends of each two adjacent power batteries 1. The series connection of the two adjacent power batteries 1 is achieved by the engagement and electrical connection of the first plug structure 2 and the first slot structure 3. In other words, in addition to utilizing the plug structure 2 and the slot structure 3 to achieve the series connection of power batteries, the embodiment of the present invention can also utilize the engagement of the plug structure 2 and the slot structure 3 to limit the position of the power batteries 1. This ensures a certain degree of stability and shock resistance in the series power battery structure without the need for a dedicated position limiting structure. Furthermore, the embodiment of the present invention can achieve the series assembly of power batteries by engaging the plug structure 2 and the slot structure 3 between the power batteries 1, which facilitates rapid assembly.

[0064] In some embodiments, the first plug structure 2 includes a plug portion 22, with the middle portions of opposing side walls of the plug portion 22 arching outward to form latching protrusions 23. The first slot structure 3 includes a slot portion 32, which includes a slot 321. The middle portions of opposing side walls of the slot 321 each have latching grooves 322 recessed outwardly. When the power batteries 1 are connected in series, the plug portion 22 can be inserted into the corresponding slot 321, with the latching protrusions 23 latching into the corresponding latching grooves 322. When the plug portion 22 is inserted into the slot 321, the front end of the plug portion 22 first inserts into the entrance of the slot 321. Then, the latching protrusions 23 on both sides of the plug portion 22 slide into the slot 321 while pressing outward against the side walls of the slot 321. When the plug portion 22 is fully inserted, the latching protrusions 23 on both sides of the plug portion 22 latch into the latching grooves 322 on both sides of the slot 321, respectively, securing the plug portion 22 within the slot 321, thereby achieving a secure connection and electrical connection between the first plug structure 2 and the first slot structure 3.

[0065] The first plug structure 2 can be integrally formed with the corresponding structure of the power battery 1 or fixedly installed on the corresponding structure of the power battery 1. Similarly, the first slot structure 3 can be integrally formed with the corresponding structure of the power battery 1 or fixedly installed on the corresponding structure of the power battery 1. In addition, the present invention does not impose any specific restrictions on the specific structure of the power battery 1 or the specific configuration of the first plug structure 2 / first slot structure 3. As long as the first plug structure 2 and the first slot structure 3 can achieve series connection between the power batteries 1, it is sufficient.

[0066] A common structure of a power battery 1 includes a housing 11 and a top cover 12. The housing 11 is provided with a winding core 13 and other structures. A terminal 14 is provided on the top cover 12 or the bottom 111 of the housing 11. Of course, it is not excluded that both the bottom 111 and the top cover 52 may have terminals, or that neither may have terminals. Furthermore, the power battery 1 is not limited to the housing 11 plus the top cover 12. For example, it is not excluded that both ends may have covers, with one of the covers having terminals. Of course, it is also excluded that both covers may have terminals, or that neither may have terminals. Based on different embodiments, the first plug structure 2 / first slot structure 3 may be provided on a terminal, the top cover, the bottom, the cover, etc.

[0067] See also Figures 1 to 4 In some embodiments, the 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 to the pole 14 by laser welding.

[0068] exist Figure 1 In the example shown, one end of the power battery 1 is provided with a pole 14, to which the first plug structure 2 is fixed and electrically connected. Specifically, in this embodiment, the pole 14 is formed on the top cover 12, but this is not limiting.

[0069] Please combine Figure 2 Specifically, the first plug structure 2 fixed to the pole 14 includes a base portion 21, a plug portion 22 protruding from the middle of the base portion 21, and the base portion 21 is fixed to the end surface of the pole 14. The first plug structure 2 is engaged with the first slot structure 3 through the plug portion 22.

[0070] In different embodiments, a pole 14 is provided at one end of the 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 is not limited thereto.

[0071] Please combine Figure 3Specifically, the first slot structure 3 fixed to the pole 14 includes a base portion 31, the middle portion of which protrudes into a slot portion 32. The base portion 31 can be fixed to the end surface of the pole 14. The first slot structure 3 is engaged with the first plug structure 2 via the slot portion 32.

[0072] See also Figures 5 to 8 In some embodiments, the 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. The pole 14 integrally protrudes out from the plug portion. For the first plug structure 2, the plug portion is the plug portion 22 (e.g., Figure 6 As shown), for the first slot structure 3, the plug-in portion is the slot portion 32 (as shown Figure 8 (As shown). The first plug structure 2 is engaged with the first slot structure 3 via the plug portion 22, and the first slot structure 3 is engaged with the first plug structure 2 via the slot portion 32. Specifically, the pole 14 can be fixed to the top cover 52 by riveting. Of course, in different embodiments, it can also be fixed to the shell bottom 111, etc.

[0073] See also Figures 1 to 3 In some embodiments, a terminal 14 is provided at one end of the power battery 1, and a first plug structure 2 or a first slot structure 3 is fixed to and electrically connected to the bottom 111 of the housing at the other end of the power battery 1. The first plug structure 2 or the first slot structure 3 can be fixed to the bottom 111 by laser welding. Of course, the other end of the power battery 1 does not necessarily have to be the bottom 111; it can also be a cover. In this case, the first plug structure 2 or the first slot structure 3 can be fixed to the cover.

[0074] Specifically, the pole 14 can be set on the top cover 12 (the cover at the other end when one end is the shell bottom 111). At this time, the shell bottom 111 at the other end of the power battery 1 is fixed and electrically connected to the first plug structure 2 or the first slot structure 3 (such as Figure 1 (As shown). The terminal 14 can be mounted on the housing bottom 111, while the top cover 12 at the other end of the power battery 1 is fixed and electrically connected to the first plug structure 2 or the first slot structure 3. If a cover is provided at both ends of the power battery 1, the terminal 14 can be mounted on one of the covers, while the cover at the other end of the 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 mounted on the housing bottom 111 or the cover, this is not limited to being fixedly connected, and other methods of mounting the first plug structure 2 or the first slot structure 3 on the housing bottom 111 or the cover are not excluded.

[0075] Specifically, the first plug structure 2 fixed to the housing bottom 111 or the cover can include a base portion 21, with a plug portion 22 protruding from the middle of the base portion 21. The base portion 21 is fixed to the outer surface of the housing bottom 111 or the cover, and the first plug structure 2 is engaged with the first slot structure 3 via the plug portion 22. It is understood that each first plug structure 2 in the present invention can be identical.

[0076] Specifically, the first slot structure 3 fixed to the housing bottom 111 or the cover can include a base portion 31, with a central portion of the base portion 31 extending outwardly from a slot portion 32. The base portion 31 is fixedly attached to the outer surface of the housing bottom 111 or the cover, and the first slot structure 3 is engaged with the first plug structure 2 via the slot portion 32. It is understood that all first slot structures 3 in the present invention can be identical.

[0077] It is understandable that the arrangement positions of the first plug structure 2 and the first slot structure 3 can be interchanged.

[0078] Specifically, the first plug structure 2 is formed by integrally processing a metal piece.

[0079] Specifically, the first slot structure 3 is formed by integrally processing a metal piece.

[0080] In some embodiments, the power battery 1 is a cylindrical power battery.

[0081] See also Figure 11 and Figure 12 Specifically, the series power battery structure also includes a wound water-cooling tube 4, which is continuously wrapped around the circumferential outer wall of each linearly arranged cylindrical power battery 1 in the series power battery structure. The provision of the wound water-cooling tube 4 allows heat transfer through the wound water-cooling tube 4 to cool each cylindrical power battery 1. Furthermore, the provision of the wound water-cooling tube 4 radially limits the position of each cylindrical power battery 1, thereby stabilizing the series battery structure and improving its seismic resistance.

[0082] Example 3

[0083] Please combine Figures 1 to 12 The utility model discloses a battery pack, which includes a shell 5 and the power battery series structure as described above, and the power battery series structure is arranged in the shell 5.

[0084] See also Figures 9 to 12In some embodiments, the housing 5 includes a tubular shell 51 and two top covers 52 . The two top covers 52 are respectively provided at the two open ends of the tubular shell 51 . The top covers 52 are provided with one of the second plug structure 6 and the second slot structure 7 . The 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 on the end facing the top cover 52 . The second plug structure 6 and the second slot structure 7 engage with each other. The engagement 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 power battery 1 contributes to the structural stability of the battery pack.

[0085] Specifically, the second plug structure 6 or second slot structure 7 provided on the top cover 52 includes a base plate portion 61 / 71 fixed to the center of the top cover 52. The base plate portion 61 / 71 protrudes inwardly to form a plug-in portion for engagement. The base plate portion 61 / 71 is exposed outside the top cover 52 and is configured to electrically connect to an external device. Of course, the power battery pack is not limited to electrically connecting to an external device via the second plug structure 6 / second slot structure 7. When electrically connecting to an external device via the second plug structure 6 / second slot structure 7, the power battery pack is not limited to having the aforementioned structure and method.

[0086] exist Figures 9 to 12 In the embodiment, one of the top covers 52 is provided with a second plug structure 6, the corresponding plug portion being a plug portion 62, and the second plug structure 6 is engaged with the second slot structure 7 via the plug portion 62. The other top cover 52 is provided with a second slot structure 7, the corresponding plug portion being a slot portion 72, and the second slot structure 7 is engaged with the second plug structure 6 via the slot portion 72.

[0087] Regarding how to arrange the second plug structure 6 / the second slot structure 7 on the power battery 1 , reference may be made to the arrangement of the first plug structure 2 / the first slot structure 3 on the power battery 1 , which will not be described in detail here.

[0088] 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.

[0089] In some embodiments, the wound water-cooling pipe 4 is provided with sealed adapters 41 at both ends, and the sealed adapters 41 extend outward through the housing 5. Since the wound water-cooling pipe 4 is connected to the sealed adapters 41 at both ends and extends outward through the housing 5, it is convenient to connect with the external pipeline to realize the flow of cooling medium.

[0090] Specifically, the outer shell 5 includes a tubular shell 51 and two top covers 52 . The two top covers 52 are respectively provided on the two open ends of the tubular shell 51 . The sealing adapters 41 connected to the two ends of the wound water-cooling tube 4 are respectively extended outward from the two top covers 52 .

[0091] 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 battery pack.

[0092] 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, and the outer side of the wound water-cooling tube 4 defines an outer cylindrical surface. The inner cylindrical surface is aligned with the circumferential outer wall of each cylindrical power battery 1, and the outer cylindrical surface is aligned with the inner wall of the outer shell 5. Because the wound water-cooling tube 4 is a flat water-cooling tube, it avoids occupying excessive space, which facilitates a compact structure of the cylindrical power battery pack. Furthermore, the inner cylindrical surface defined by the inner side of the wound water-cooling tube 4 is aligned 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 aligned with the inner wall of the outer shell 5, which helps improve the overall stability of the cylindrical power battery pack.

[0093] Specifically, the inner wall of the outer shell 5 is the inner wall of the tubular housing 51 .

[0094] The above disclosure is only a preferred example of the present invention, and its role is to facilitate the understanding and implementation of those skilled in the art. It certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made within the scope of the patent application of the present invention still fall within the scope covered by the present invention.

Claims

1. A power battery unit, characterized in that: The power battery unit includes a power battery, and both ends of the power battery are respectively provided with a plug structure and a slot structure for connecting in series with other power batteries, the plug structure is used to snap together and electrically connect with the slot structure of the other power battery, and the slot structure is used to snap together and electrically connect with the plug structure of the other power battery; The plug structure includes a plug portion, the middle portions of opposite side walls of the plug portion are respectively arched outward to form a locking protrusion, and the slot structure includes a slot, the middle portions of opposite side walls of the slot are respectively concave outward to form a locking groove.

2. The power battery unit according to claim 1, characterized in that: The power battery is provided with a pole, and the plug structure or the slot structure is fixed on and electrically connected to the pole.

3. The power battery unit according to claim 2, characterized in that: The plug structure or the slot structure fixed on the pole includes a base plate portion, a middle portion of the base plate portion protrudes out of the plug portion, and the base plate portion is fitted and fixed to the end surface of the pole.

4. The power battery unit according to claim 1, characterized in that: The power battery is provided with a pole, which forms the base of the plug structure or the slot structure, and an inserting portion protrudes integrally from the pole.

5. The power battery unit according to any one of claims 2 to 4, characterized in that: The pole is provided at one end of the power battery, and the plug structure or the slot structure is fixed to and electrically connected to the shell bottom or cover of the other end of the power battery.

6. The power battery unit according to claim 1, characterized in that: The plug structure and the slot structure are formed by integrally processing metal parts.

7. A power battery series structure, characterized in that: The system comprises at least two power batteries connected end to end in series, wherein the opposite ends of each two adjacent power batteries are respectively provided with a first plug structure and a first slot structure, and the series connection of the two adjacent power batteries is achieved by the engagement and electrical connection of the first plug structure and the first slot structure.

8. The power battery series structure according to claim 7, characterized in that: The power battery is provided with a pole, and the first plug structure or the first slot structure is fixed on and electrically connected to the pole.

9. The power battery series structure according to claim 8, characterized in that: The first plug structure or the first slot structure fixed on the pole includes a first base plate portion, a middle portion of which protrudes out of a first plug-in portion, and the first base plate portion is fixed to an end surface of the pole.

10. The power battery series structure according to claim 7, characterized in that: The power battery is provided with a pole, which forms the base of the first plug structure or the first slot structure, and an inserting portion protrudes integrally from the pole.

11. The power battery series structure according to any one of claims 8 to 10, characterized in that: The pole is provided at one end of the power battery, and the first plug structure or the first slot structure is fixed to and electrically connected to the shell bottom or cover of the other end of the power battery.

12. The power battery series structure according to claim 11, characterized in that: The first plug structure or the first slot structure fixed on the shell bottom or the cover includes a second substrate portion, the middle portion of which protrudes out a second plug-in portion, and the second substrate portion is fixed to the outer surface of the shell bottom or the cover.

13. The power battery series structure according to claim 7, characterized in that: The first plug structure includes a plug part, and the middle parts of the opposite side walls of the plug part are respectively arched outward to form a locking protrusion. The first slot structure includes a slot, and the middle parts of the opposite side walls of the slot are respectively concave outward with a locking groove. The plug part is inserted into the slot, and the locking protrusions are respectively locked in the corresponding slots.

14. The power battery series structure according to claim 7, characterized in that: The first plug structure and the first slot structure are formed by integrally processing a metal piece.

15. The power battery series structure according to claim 7, characterized in that: The power battery is a cylindrical power battery.

16. The power battery series structure according to claim 15, characterized in that: It also includes a winding water cooling pipe, which is continuously wound around the circumferential outer wall of each power battery connected end to end.

17. A battery pack, characterized in that: include: shell; The power battery series structure according to any one of claims 7 to 16, wherein the power battery series structure is arranged on the casing.

18. The battery pack according to claim 17, wherein: The outer shell includes a tubular shell and two top covers, which are respectively covered at the two open ends of the tubular shell. The top covers are provided with one of a second plug structure and a second slot structure. The end of the power battery adjacent to the top cover facing the top cover is provided with the other of the second plug structure and the second slot structure, and the second plug structure and the second slot structure are buckled together.

19. The battery pack according to claim 18, wherein: The second plug structure or second slot structure provided on the top cover includes a third substrate portion fixed to the middle of the top cover, the third substrate portion protruding inwardly to form a plug-in portion for snapping together, the third substrate portion being exposed to the outside of the top cover and configured to be electrically connected to an external device.

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