Large-capacity battery with connected pole and shell and large-capacity battery series structure

Abstract

The present invention proposes a large-capacity battery with a pole connected to a housing, and a large-capacity battery series structure, belonging to the field of energy storage battery technology. The battery comprises a housing and a pole body, with one side of the pole body extending through the side wall of the housing and beyond. When multiple large-capacity batteries with poles connected to the housing are connected in series, the pole body extending beyond the side wall of the housing can be used to connect them, eliminating the need for wires and avoiding the problems of wire entanglement and numerous wire ends. Furthermore, the poles have a large flow rate, fully meeting the current flow between two adjacent large-capacity batteries, preventing overheating.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy storage batteries, and relates to a large-capacity battery series connection technology, specifically a large-capacity battery with a pole connected to a shell, and a large-capacity battery series connection structure. Background Art

[0002] As a new energy secondary battery, lithium-ion batteries have the advantages of high energy density and power density, high operating voltage, light weight, small size, long cycle life, good safety performance, and green environmental protection. They have broad application prospects in portable appliances, power tools, large-scale energy storage, and power supply for electric vehicles.

[0003] Especially in the current context of energy conservation, emission reduction, and carbon neutrality, the demand for lithium batteries in the energy storage field is in short supply. Currently, lithium batteries used in the energy storage field are mostly in the form of battery packs or pack boxes. Battery packs or pack boxes require a large number of single cells and complex wiring connections, and require many functional accessories. At the same time, if the heat dissipation of the battery is not well controlled, it is very easy to cause safety accidents. The capacity of a single large-capacity lithium battery is equivalent to that of a battery module or pack box. It can be used in series and parallel, with simple and convenient connection. At the same time, the heat dissipation design can be directly applied to the battery body, enhancing the safety of the battery body. Therefore, large-capacity single lithium batteries are of great significance to the application of energy storage.

[0004] Due to the large cell capacity, large-capacity batteries experience significant heat buildup during operation. If not dissipated promptly, this can lead to serious safety incidents. Furthermore, the high overcurrent flow of large-capacity batteries requires sufficient overcurrent area in the terminals. Consequently, the terminals are larger, placing higher demands on the welding process between the lugs and the terminals.

[0005] The utility model patent with the patent number 2020208925177 discloses a high-safety large-capacity battery, which includes a shell, a base plate and a cover plate. The shell, base plate and cover plate are provided with a three-stage pressure relief design with several explosion-proof notches. When the internal air pressure of the large-capacity battery is too high, the internal gas can be released successively through the relief valve, explosion-proof membrane and explosion-proof notches to avoid the instantaneous explosion of the battery. This patent can effectively prevent the pressure accumulation inside the large-capacity battery, and release the gas inside the battery in stages and in a timely manner to avoid the instantaneous explosion of the battery. This patent can solve the problem of internal pressure discharge of the battery to a certain extent and ensure the safety of the battery, but the patent does not provide a solution for the problem of connecting multiple large-capacity single cells. In the prior art, when multiple large-capacity single cells are connected in series, they are mostly connected through wires. First, there are problems of wire entanglement and many wire ends; second, the current of the large-capacity battery is large, and the problem of wire overburning is prone to occur. Summary of the Invention

[0006] In view of the problems of wire entanglement, excessive wire ends and wire overburning when multiple large-capacity single batteries are connected in series, the present invention proposes a large-capacity battery with a pole connected to a shell and a large-capacity battery series structure.

[0007] The present invention fixes the pole to the side wall of the housing so that one side of the pole extends to the outside of the housing. When multiple large-capacity batteries are connected in series, the poles of two adjacent large-capacity batteries can be directly connected, avoiding the problems of wire entanglement and numerous wire ends during wire connection. At the same time, the pole can withstand a large overcurrent, avoiding the problem of overheating. The specific technical solution is as follows:

[0008] A large-capacity battery with a pole connected to a shell comprises a shell and a pole body, wherein one side of the pole body penetrates a shell side wall of the shell and extends to the outside of the shell side wall.

[0009] It is further defined that the pole body is provided with a pole heat conducting portion and a pole welding portion, the pole welding portion is placed in the inner cavity of the shell, and the pole heat conducting portion passes through the shell side wall and extends to the outside of the shell side wall.

[0010] It is further defined that a rectangular ring edge is provided at the connection between the pole heat conducting portion and the pole welding portion, and the rectangular ring edge surrounds the pole body.

[0011] It is further defined that the pole heat conducting portion is fixedly connected to the side wall of the housing through an upper panel.

[0012] It is further defined that a lower gasket is provided between the shell side wall and the pole welding portion; and an upper gasket is provided between the pole heat conducting portion and the upper panel.

[0013] It is further defined that a pole through-hole is provided on the side wall of the shell, and a first concave platform and a second concave platform are provided in sequence from the outside to the inside of the pole through-hole; a second sealing surface, a first sealing surface and a lower gasket insulating surface are provided on the lower gasket; a sealing surface and an upper gasket insulating surface are provided on the upper gasket; the pole welding portion is in contact with the lower gasket insulating surface of the lower gasket, the lower end surface of the rectangular ring edge is in contact with the first sealing surface of the lower gasket, and the side surface of the rectangular ring edge is in contact with the second sealing surface of the lower gasket; the pole heat conducting portion is in contact with the upper gasket insulating surface of the upper gasket, and the upper end surface of the first concave platform is connected to the upper panel through the sealing surface of the upper gasket.

[0014] It is further defined that the thickness of the rectangular ring edge is the same as the thickness of the second concave platform.

[0015] It is further defined that the upper panel, the upper washer and the first concave platform are all provided with rivet holes, and the upper panel, the upper washer and the first concave platform are fixedly connected by rivets passing through the rivet holes.

[0016] It is further defined that the upper washer and the lower washer are both insulating plastic parts or insulating rubber parts.

[0017] It is further defined that an upper cover is provided at the top opening of the shell, the shell and the upper cover together form a battery accommodating cavity, and the upper cover is provided with a liquid filling port and an explosion vent.

[0018] It is further defined that a plurality of battery cells are arranged in the battery accommodating cavity, and the plurality of battery cells are connected in parallel through the pole welding portion.

[0019] It is further defined that the battery cell includes a battery cell body, and the tabs on the battery cell body are connected to the electrode welding portion through a busbar.

[0020] It is further defined that the busbars include positive busbars and negative busbars, and there are multiple positive busbars and multiple negative busbars, multiple positive busbars are arranged in parallel on the battery cell body, and multiple negative busbars are arranged in parallel on the battery cell body, the pole body includes a positive pole and a negative pole, the battery cell body is connected to the pole welding part of the positive pole through multiple positive busbars, and the battery cell body is connected to the pole welding part of the negative pole through multiple negative busbars.

[0021] It is further defined that there are two positive busbars and two negative busbars.

[0022] It is further defined that the positive electrode busbar and the negative electrode busbar both have an L-shaped cross section.

[0023] It is further defined that a support portion is provided between the battery core and the bottom wall of the shell.

[0024] It is further defined that the pole heat conducting portion is provided with a heat pipe plugging groove along the height direction, a heat pipe is plugged into the heat pipe plugging groove, and the condensing end of the heat pipe extends to the outside of the heat pipe plugging groove.

[0025] It is further defined that the condensing end of the heat pipe is provided with a refrigeration mechanism.

[0026] It is further defined that the condensing end of the heat pipe is connected to the refrigeration mechanism through a heat spreader.

[0027] It is further defined that the heat spreader is provided with a heat pipe through-hole, the heat pipe passes through the heat pipe through-hole and is connected to the cooling mechanism, and the portion of the heat pipe plugged into the heat pipe plug-in groove is coated with thermal grease.

[0028] It is further defined that the cross-section of the heat pipe perforation is rectangular.

[0029] It is further defined that fastener retaining grooves are provided at two opposite ends of the pole heat conducting part; an arc-shaped fastening groove is provided on one side of the pole heat conducting part away from the pole welding part, and the arc surface of the arc-shaped fastening groove is not greater than 180°.

[0030] The large-capacity battery series structure comprises a plurality of large-capacity batteries connected with the poles and the shell, wherein two adjacent large-capacity batteries connected with the poles and the shell are connected in series via a fastening connection mechanism.

[0031] It is further defined that the fastening connection mechanism includes a fixing portion, a pushing portion and a threaded fastener, the end of the fixing portion and the end of the pushing portion are both provided with a snap-in tongue, and the snap-in tongue of the fixing portion and the snap-in tongue of the pushing portion are arranged opposite to each other, the snap-in tongue on the fixing portion and the snap-in tongue on the pushing portion are respectively placed in the fastener holding grooves on the large-capacity battery connecting two adjacent poles to the shell; the fixing portion and the pushing portion are connected by a threaded fastener.

[0032] It is further defined that the threaded fastener includes a threaded rod and a nut, one end of the threaded rod is fixedly connected to the fixing portion, the other end passes through the pushing portion and is limited by the nut, and the threaded rod is threadedly connected to the pushing portion.

[0033] It is further defined that a sliding groove is provided on the fixing portion, and an end portion of the pushing portion opposite to the locking tongue is placed in the sliding groove.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] 1. The large-capacity battery with the pole connected to the shell of the present invention includes a shell and a pole body, and one side of the pole body penetrates the shell side wall of the shell and extends to the outside of the shell side wall. When multiple large-capacity batteries with poles connected to the shell are connected in series, they can be connected through the pole body extending to the outside of the shell side wall, without the need for wires, thus avoiding the problems of wire entanglement and many wire ends; at the same time, the pole has a large flow rate, which can fully meet the current flow between two adjacent large-capacity batteries, and will not cause overburning problems. The pole body is integrated with the shell and is in direct contact with the electrolyte, which can quickly conduct the heat of the battery cell to the outside of the shell, effectively preventing the battery cell from collecting heat.

[0036] 2. A pole heat conduction part and a pole welding part are provided on the pole body. The pole welding part is placed in the inner cavity of the shell. The pole welding part facilitates the series and parallel connection of multiple battery cells, and the pole heat conduction part facilitates the series connection of multiple large-capacity batteries. At the same time, the pole heat conduction part can also conduct and dissipate the heat generated inside the battery, preventing heat accumulation inside the battery and ensuring the safety of large-capacity single cells during operation; the heat dissipation performance of the pole body is improved, and the refrigeration mechanism also plays a role in balancing the temperature of the pole body.

[0037] 3. A rectangular ring edge is provided at the connection between the pole heat conducting part and the pole welding part, which facilitates the sealing and insulation connection between the pole body and the shell side wall.

[0038] 4. The heat conducting part of the pole is fixedly connected to the side wall of the shell through the upper panel, and the pole body and the side wall of the shell can be clamped together through the upper panel.

[0039] 5. A lower gasket is provided between the side wall of the shell and the pole welding part, and an upper gasket is provided between the pole heat conducting part and the upper panel. The lower gasket can insulate and seal the side wall of the shell and the pole welding part; the upper gasket can insulate and seal the pole heat conducting part and the upper panel.

[0040] 6. A pole through-hole is provided on the side wall of the housing. A first concave platform and a second concave platform are sequentially provided in the pole through-hole from the outside to the inside. The first concave platform and the second concave platform can tighten the connection between the lower washer, the upper washer, the upper panel, the pole body and the side wall of the housing, thereby improving the sealing and insulation effects.

[0041] 7. The upper panel, the upper washer and the first concave platform are fixedly connected by rivets passing through the rivet holes. The upper panel, the upper washer and the first concave platform are fastened together by the rivets.

[0042] 8. The busbars include positive and negative busbars. There are multiple positive and negative busbars, each of which is arranged in parallel on the battery cell body. The multiple positive busbars are arranged in parallel on the battery cell body. The pole body includes a positive pole and a negative pole. The battery cell body is connected to the pole welding portion of the positive pole via the multiple positive busbars, and the battery cell body is connected to the pole welding portion of the negative pole via the multiple negative busbars. The multiple positive and negative busbars improve the overall welding balance between the battery cell and the pole body, and also provide a redundant protection mechanism. If a single-side tab on one pole of a battery cell has a poor solder joint or a weak weld, it will not affect the overall performance of the battery.

[0043] 9. Both the positive busbar and the negative busbar have an L-shaped cross section. The L-shaped structure facilitates welding between the busbar and the pole body.

[0044] 10. A support portion is provided between the battery cell and the bottom wall of the shell, which can prevent the battery cell from being suspended in the air and improve the stability of the battery cell installation.

[0045] 11. A heat pipe slot is provided along the height of the thermal conductive portion of the battery post. A heat pipe is inserted into the slot, with the condensing end of the heat pipe extending to the outside of the slot. The heat pipe can be used to promptly remove heat from the battery post that accumulates on the battery post.

[0046] 12. A cooling mechanism is installed at the condensing end of the heat pipe to improve the efficiency of heat dissipation. The portion of the heat pipe inserted into the heat pipe insertion slot is coated with thermal grease; the thermal grease can accelerate the heat conduction between the pole body and the heat pipe.

[0047] 13. The condensing end of the heat pipe is connected to the refrigeration mechanism through a heat spreader. The heat spreader can evenly distribute the temperature transferred to the condensing end of the heat pipe at the lower end of the refrigeration mechanism, thereby improving the heat dissipation efficiency of the refrigeration mechanism.

[0048] 14. Fastener retaining grooves are provided at opposite ends of the terminal's heat-conducting portion, facilitating the series connection of two adjacent high-capacity batteries. An arc-shaped fastening groove is provided on the side of the terminal's heat-conducting portion away from the terminal's welding portion. The arc of the arc-shaped fastening groove is no more than 180°, enhancing the connection strength between two adjacent high-capacity batteries.

[0049] 15. The fastening connection mechanism includes a fixed part, a pushing part and a threaded fastener. When in use, the threaded fastener pushes the pushing part closer to the fixed part, shortening the distance between the locking tongue at the end of the fixed part and the locking tongue at the end of the pushing part, thereby clamping two adjacent large-capacity batteries.

[0050] 16. A sliding groove is provided on the fixed portion, and an end portion of the pushing portion opposite to the latch tongue is placed in the sliding groove. The sliding groove can improve the stability of the moving portion toward the fixed portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 This is a schematic diagram of the structure of a large-capacity battery in which the pole is connected to the shell of the present invention;

[0052] Figure 2 A longitudinal cross-sectional view of a large-capacity battery with a terminal connected to a housing according to the present invention;

[0053] Figure 3 A schematic diagram of the connection between the shell side wall and the positive or negative electrode column;

[0054] Figure 4 An exploded view of the connection between the shell side wall and the positive or negative electrode column;

[0055] Figure 5 Schematic diagram of the structure of the positive or negative column Figure 1 ;

[0056] Figure 6 Schematic diagram of the structure of the shell side wall;

[0057] Figure 7 Schematic diagram of the structure of the lower gasket;

[0058] Figure 8 Schematic diagram of the structure of the upper gasket;

[0059] Figure 9 Schematic diagram of the structure of the upper panel;

[0060] Figure 10 Schematic diagram of the structure of the battery cell;

[0061] Figure 11 Schematic diagram of the structure of the heat sink;

[0062] Figure 12 This is a schematic diagram of the structure of a large-capacity battery in series according to the present invention;

[0063] Figure 13 Schematic diagram of the fastening connection mechanism Figure 1 ;

[0064] Figure 14 Schematic diagram of the fastening connection mechanism Figure 2 ;

[0065] Figure 15 for Figure 5 Schematic diagram of the structure of the positive or negative column Figure 2 ;

[0066] Among them, 1-shell, 2-upper cover, 3-positive pole, 4-negative pole, 5-shell side wall, 51-first concave platform, 52-second concave platform, 6-heat pipe, 7-refrigeration mechanism, 8-liquid injection port, 9-explosion vent, 10-upper panel, 101-upper panel sealing surface, 102-welding surface, 11-upper gasket, 111-sealing surface, 112-upper gasket insulation surface, 12-lower gasket, 121-second sealing surface, 122-first sealing surface, 123-lower gasket insulation Surface, 13-rivet, 14-battery cell, 140-battery cell body, 141-positive busbar, 142-negative busbar, 15-pole heat conduction part, 16-rectangular ring edge, 17-pole welding part, 18-heat pipe plug-in groove, 19-fastener holding groove, 20-arc-shaped fastening groove, 21-heat spreader, 211-heat pipe perforation, 22-fastening connection mechanism, 221-fixing part, 222-pushing part, 223-threaded rod, 224-nut, 225-snapping tongue. DETAILED DESCRIPTION

[0067] The technical solution of the present invention will be further explained below with reference to the accompanying drawings and embodiments, but the present invention is not limited to the embodiments described below.

[0068] The large-capacity battery of the present invention, in which the pole is connected to the shell, includes a shell 1 and a pole body. One side of the pole body passes through the shell side wall 5 of the shell 1 and extends to the outside of the shell side wall 5. The pole body is provided with a pole heat conducting portion 15 and a pole welding portion 17. The pole welding portion 17 is placed in the inner cavity of the shell 1. The pole heat conducting portion 15 passes through the shell side wall 5 and extends to the outside of the shell side wall 5. A rectangular ring 16 is provided at the connection between the pole heat conducting portion 15 and the pole welding portion 17. The rectangular ring 16 surrounds the pole body. The pole heat conducting portion 15 is fixedly connected to the shell side wall 5 by an upper panel 10. A lower gasket 12 is provided between the shell side wall 5 and the pole welding portion 17; an upper gasket 11 is provided between the pole heat conducting portion 15 and the upper panel 10. The housing sidewall 5 is provided with a pole through-hole, within which a first recess 51 and a second recess 52 are arranged, from outside to inside. The lower gasket 12 is provided with a second sealing surface 121, a first sealing surface 122, and a lower gasket insulating surface 123. The upper gasket 11 is provided with a sealing surface 111 and an upper gasket insulating surface 112. The pole welding portion 17 is aligned with the lower gasket insulating surface 123 of the lower gasket 12, the lower end surface of the rectangular ring 16 is aligned with the first sealing surface 122 of the lower gasket 12, and the side surface of the rectangular ring 16 is aligned with the second sealing surface 121 of the lower gasket 12. The pole heat conducting portion 15 is aligned with the upper gasket insulating surface 112 of the upper gasket 11, and the upper end surface of the first recess 51 is connected to the upper panel 10 via the sealing surface 111 of the upper gasket 11. The thickness of the rectangular ring 16 is the same as that of the second recess 52. Rivet holes are provided on the upper panel 10, the upper washer 11 and the first recess 51, and the upper panel 10, the upper washer 11 and the first recess 51 are fixedly connected by rivets 13 passing through the rivet holes. The upper washer 11 and the lower washer 12 are both insulating plastic parts or insulating rubber parts. An upper cover plate 2 is provided at the top opening of the shell 1. The shell 1 and the upper cover plate 2 together form a battery accommodating cavity. The upper cover plate 2 is provided with a liquid filling port 8 and an explosion vent 9. A plurality of battery cells 14 are provided in the battery accommodating cavity, and the plurality of battery cells 14 are connected in parallel through a pole welding portion 17. The battery cell 14 includes a battery cell body 140, and the tabs on the battery cell body 140 are connected to the pole welding portion 17 through a busbar. The busbars include a positive busbar 141 and a negative busbar 142. Multiple positive busbars 141 and multiple negative busbars 142 are provided, arranged side by side on the battery cell body 140. The electrode body includes a positive electrode column 3 and a negative electrode column 4. The battery cell body 140 is connected to the electrode column welding portion 17 of the positive electrode column 3 via multiple positive busbars 141, and the battery cell body 140 is connected to the electrode column welding portion 17 of the negative electrode column 4 via multiple negative busbars 142. There are two positive busbars 141 and two negative busbars 142. Both the positive busbars 141 and the negative busbars 142 have an L-shaped cross-section. A support portion is provided between the battery cell 14 and the bottom wall of the casing 1.The pole heat conducting part 15 is provided with a heat pipe plug-in groove 18 along the height direction, and a heat pipe 6 is plugged into the heat pipe plug-in groove 18, and the condensation end of the heat pipe 6 extends to the outside of the heat pipe plug-in groove 18. A refrigeration mechanism 7 is provided at the condensation end of the heat pipe 6. The condensation end of the heat pipe 6 is connected to the refrigeration mechanism 7 through a heat spreader 21, and the part of the heat pipe 6 plugged into the heat pipe plug-in groove 18 is coated with thermal grease. A heat pipe through-hole 211 is provided on the heat spreader 21, and the heat pipe 6 passes through the heat pipe through-hole 211 and is connected to the refrigeration mechanism 7. The cross-section of the heat pipe through-hole 211 is rectangular. Fastener retaining grooves 19 are provided at the opposite ends of the pole heat conducting part 15; an arc-shaped fastening groove 20 is provided on the side of the pole heat conducting part 15 away from the pole welding part 17, and the arc angle of the arc-shaped fastening groove 20 is not greater than 180°.

[0069] The large-capacity battery series structure of the present invention includes a plurality of large-capacity batteries connected to a housing, wherein two adjacent large-capacity batteries connected to the housing are connected in series via a fastening connection mechanism 22. The fastening connection mechanism 22 includes a fixed portion 221, a push portion 222, and a threaded fastener. The ends of the fixed portion 221 and the push portion 222 are both provided with a snap-in tongue 225, and the snap-in tongue 225 of the fixed portion 221 and the snap-in tongue 225 of the push portion 222 are arranged opposite to each other. The snap-in tongue 225 on the fixed portion 221 and the snap-in tongue 225 on the push portion 222 are respectively placed in the fastener retaining groove 19 on the large-capacity batteries connected to the housing of the two adjacent large-capacity batteries; the fixed portion 221 and the push portion 222 are connected via a threaded fastener. The threaded fastener includes a threaded rod 223 and a nut 224. One end of the threaded rod 223 is fixedly connected to the fixed portion 221, and the other end passes through the push portion 222 and is retained by the nut 224. The threaded rod 223 is threadedly connected to the push portion 222. The fixed portion 221 is provided with a slide groove, and the end of the push portion 222 opposite the locking tongue 225 is placed in the slide groove.

[0070] Example 1

[0071] See also Figure 1-Figure 2 The large-capacity battery in which the electrode is connected to the shell in this embodiment includes a shell 1 and a electrode body. The electrode body includes a positive electrode 3 and a negative electrode 4. The shell 1 is composed of a shell side wall 5 and a shell bottom wall to form a prismatic structure or a cylindrical structure. Preferably, the shell 1 in this embodiment is a quadrangular prism structure, the top of the shell 1 is open, and an upper cover plate 2 is provided at the top opening of the shell 1. The shell side wall 5, the shell bottom wall and the upper cover plate 2 together form a battery accommodating cavity; the positive electrode 3 and the negative electrode 4 are respectively arranged on two opposite shell side walls 5 on the shell 1 and extend to the outside of the shell side walls 5.

[0072] See also Figure 5In this embodiment, the positive electrode post 3 and the negative electrode post 4 both include a pole heat conducting portion 15 and a pole welding portion 17, wherein the pole heat conducting portion 15 and the pole welding portion 17 are integrated, the pole welding portion 17 is placed inside the battery accommodating cavity, and the pole heat conducting portion 15 passes through the shell side wall 5 and extends to the outside of the shell side wall 5.

[0073] See also Figure 3 and Figure 4 A rectangular ring edge 16 is provided at the connection between the pole heat conducting part 15 and the pole welding part 17. The rectangular ring edge 16 is a structure with a rectangular cross section. The rectangular ring edge 16 surrounds the two opposite side surfaces and the upper end surface and the lower end surface of the positive pole 3 and the negative pole 4 to form an annular structure and surrounds the whole circle. An upper panel 10 is provided on the pole heat conducting part 15. The pole heat conducting part 15 is fixedly connected to the shell side wall 5 through the upper panel 10. A lower gasket 12 is provided between the shell side wall 5 and the pole welding part 17. The shell side wall 5 and the pole welding part 17 are insulated and sealed by the lower gasket 12; an upper gasket 11 is provided between the pole heat conducting part 15 and the upper panel 10. The pole heat conducting part 15 and the upper panel 10 are insulated and sealed by the upper gasket 11. The specific connection structure between the upper panel 10, the pole body, the upper gasket 11, the lower gasket 12 and the shell side wall 5 is as follows: see Figure 6 A pole through-hole is provided on the side wall 5 of the housing, and a first concave platform 51 and a second concave platform 52 are provided in the pole through-hole from the outside to the inside in sequence; see Figure 7 , a second sealing surface 121, a second sealing surface 122 and a lower gasket insulating surface 123 are provided on the lower gasket 12; see Figure 8 The upper gasket 11 is provided with a sealing surface 111 and an upper gasket insulating surface 112, see Figure 9, an upper panel sealing surface 101 and a welding surface 102 are provided on the upper panel 10; the side surface of the pole welding portion 17 is in contact with the lower gasket insulating surface 123, and the pole welding portion 17 is sealed and insulated from the side surface of the second concave platform 52 and the bottom hole wall of the pole through-hole through the lower gasket insulating surface 123, the lower end surface of the rectangular ring edge 16 is in contact with the first sealing surface 122 of the lower gasket 12, and the lower end surface of the rectangular ring edge 16 is sealed and insulated from the upper end surface of the second concave platform 52 through the first sealing surface 122, the side surface of the rectangular ring edge 16 is in contact with the second sealing surface 121 of the lower gasket 12, and the lower end surface of the rectangular ring edge 16 is sealed and insulated from the upper end surface of the second concave platform 52 through the first sealing surface 122, and the side surface of the rectangular ring edge 16 is in contact with the second sealing surface 121 of the lower gasket 12, and the lower end surface of the rectangular ring edge 16 is sealed and insulated through the second sealing surface 121 of the lower gasket 12. The second sealing surface 121 seals and insulates the side surface of the rectangular ring edge 16 from the side surface of the first recessed platform 51. The side surface of the pole heat conducting portion 15 is in contact with the upper gasket insulating surface 112 of the upper gasket 11. The upper gasket insulating surface 112 seals and insulates the side surface of the pole heat conducting portion 15 from the top of the pole through-hole. The upper end surface of the first recessed platform 51 is in contact with the sealing surface 111 of the upper gasket 11. An upper panel 10 is provided outside the sealing surface 111 of the upper gasket 11. The upper end surface of the first recessed platform 51 and the upper panel 10 are sealed and insulated by the sealing surface 111 of the upper gasket 11.

[0074] Preferably, the first concave platform 51 and the second concave platform 52 of this embodiment are both annular protrusions arranged along the circumference of the pole through-hole.

[0075] Preferably, the thickness of the rectangular edge 16 of this embodiment is the same as that of the second recess 52 , so that the rectangular edge 16 is just stuck in the second recess 52 , achieving a tight connection between the rectangular edge 16 and the shell side wall 5 .

[0076] Preferably, in this embodiment, a circle of rivet holes are correspondingly provided on the upper panel 10, the edge of the upper washer 11 and the upper end surface edge of the first recess 51, and the upper panel 10, the upper washer 11 and the first recess 51 are fixedly connected by rivets 13 passing through the rivet holes.

[0077] Preferably, the upper washer 11 and the lower washer 12 of this embodiment are both insulating plastic parts or insulating rubber parts.

[0078] Preferably, a liquid injection port 8 and an explosion vent 9 are provided on the upper cover plate 2 of this embodiment.

[0079] In this embodiment, 16 battery cells 14 are arranged in the battery accommodating cavity, and the 16 battery cells 14 are connected in parallel through the pole welding parts 17 .

[0080] It should be noted that the number of battery cells 14 in this embodiment can be 5, 8, 10, 15, or even more.

[0081] See also Figure 10The battery cell 14 of this embodiment includes a battery cell body 140. Tabs are provided on opposite sides of the battery cell body 140, one of which is a positive tab and the other is a negative tab. Two positive busbars 141 are connected in parallel to the positive tab, and two negative busbars 142 are connected in parallel to the negative tab. The two positive busbars 141 are connected to the positive electrode post 3, and the two negative busbars 142 are connected to the negative electrode post 4. Preferably, the two positive busbars 141 are welded to the positive electrode post 3 and to the positive tabs, and the two negative busbars 142 are welded to the negative electrode post 4 and to the negative tabs.

[0082] It should be noted that the number of the positive electrode bus bars 141 and the negative electrode bus bars 142 in this embodiment may be 3, 4, 5, or even more.

[0083] Preferably, the positive busbar 141 and the negative busbar 142 of this embodiment are both L-shaped in cross section, which facilitates welding of the positive busbar 141 and the negative busbar 142 to the positive electrode column 3 and the negative electrode column 4 .

[0084] Preferably, a support portion is provided between the battery cell 14 and the bottom wall of the housing. The support portion is a rectangular boss that intermittently protrudes from the bottom surface, and the upper surface of the rectangular boss is flush with the lower surface of the terminal body. The support portion prevents the battery cell 14 from being suspended in the air, thereby improving the stability of the battery cell 14 connection.

[0085] In this embodiment, a heat pipe insertion groove 18 is provided on the pole heat conducting portion 15 along the height direction, and a heat pipe 6 is inserted into the heat pipe insertion groove 18. The evaporation end of the heat pipe 6 is inserted into the heat pipe insertion groove 18, and the condensation end of the heat pipe 6 extends to the outside of the heat pipe insertion groove 18. A refrigeration mechanism 7 is provided on the top of the condensation end of the heat pipe 6, and a heat spreader 21 is provided at the bottom of the refrigeration mechanism 7. Figure 11 Three heat pipe through-holes 211 are provided on the heat diffusion plate 21 , and the condensing end of the heat pipe 6 passes through the heat pipe through-holes 211 and is fixedly connected to the bottom of the refrigeration mechanism 7 .

[0086] Preferably, the outer surface of the evaporation end of the heat pipe 6 in this embodiment is coated with thermal grease.

[0087] Preferably, the heat pipe insertion groove 18 of this embodiment has a rectangular cross-section; wherein, both surfaces along the width direction of the rectangle are arc surfaces, which facilitate the insertion of the evaporation end of the heat pipe 6 into the heat pipe insertion groove 18.

[0088] It should be noted that the number of heat pipe perforations 211 in this embodiment can be 2, 4, 5, or even more. Multiple heat pipe perforations 211 can enable large-capacity batteries connected to the pole heat conducting portion 15 of two adjacent pole bodies and the shell 1 to share a heat spreader 21 and a refrigeration mechanism 7.

[0089] Preferably, the refrigeration mechanism 7 of this embodiment is a semiconductor refrigeration plate or a heat dissipation fan.

[0090] Preferably, the material of the positive electrode post 3 of this embodiment is aluminum or aluminum alloy, and a copper composite layer is provided on the side of the electrode welding portion 17 of the negative electrode post 4, and the thickness of the copper composite layer is not more than 0.2 mm.

[0091] Preferably, the material of the positive electrode busbar 141 of this embodiment is aluminum, and the material of the negative electrode busbar 142 is a copper-nickel composite sheet.

[0092] Preferably, fastener retaining grooves 19 are provided at two opposite ends of the pole heat conducting portion 15 of this embodiment; an arc-shaped fastening groove 20 is provided on the side of the pole heat conducting portion 15 away from the pole welding portion 17, and the arc-shaped fastening grooves 20 are multiple arc surface grooves arranged in parallel, and the number thereof can be 5, 10, 15, or even more, wherein the arc surface curvature of the arc-shaped fastening groove 20 is not greater than 180°; preferably, the arc surface curvature of the arc-shaped fastening groove 20 of this embodiment is between 120°-150°.

[0093] Example 2

[0094] See also Figure 12 The large-capacity battery series structure of this embodiment is formed by connecting the large-capacity batteries connected to the poles and shells of multiple embodiments in series. Preferably, the number of large-capacity batteries connected to the poles and shells of this embodiment is 3, and the large-capacity batteries connected to the adjacent two poles and shells are connected in series through a fastening connection mechanism 22.

[0095] See also Figure 13 and Figure 14 The fastening connection mechanism 22 of this embodiment includes a fixing portion 221, a pushing portion 222 and a threaded fastener. The fixing portion 221 is composed of a vertical connecting rod and a transverse connecting rod fixedly connected to the vertical connecting rod. A card-in tongue 225 is provided at the bottom of the fixing portion 221. The pushing portion 222 is a vertical connecting rod arranged parallel to the vertical connecting rod of the fixing portion 221. A sliding groove is provided at the lower end of the transverse connecting rod of the fixing portion 221. The top of the pushing portion 222 is placed in the sliding groove and can move along the sliding groove. A card is provided at the bottom of the pushing portion 222. The entry tongue 225, wherein the entry tongue 225 on the fixed portion 221 is arranged opposite to the entry tongue 225 on the pushing portion 222. Preferably, the entry tongue 225 on the fixed portion 221 of this embodiment is directly opposite to the entry tongue 225 on the pushing portion 222. The entry tongue 225 on the fixed portion 221 and the entry tongue 225 on the pushing portion 222 are respectively engaged in the fastener holding groove 19 on the large-capacity battery connecting two adjacent poles to the shell, and the fixed portion 221 and the pushing portion 222 are connected by threaded fasteners.

[0096] Preferably, the threaded fastener of this embodiment includes a threaded rod 223 and a nut 224. One end of the threaded rod 223 is fixedly connected to the fixing portion 221, and the other end passes through the pushing portion 222 and is limited by the nut 224. The threaded rod 223 is threadedly connected to the pushing portion 222.

[0097] See also Figure 15 The shape of the locking tongue 225 is an "I"-shaped structure or an "L"-shaped structure that matches the shape of the fastener retaining groove 19.

[0098] The large-capacity battery series structure of the present invention is used in the following process: the snap-in tongue 225 on the fixing part 221 and the snap-in tongue 225 on the pushing part 222 are respectively snapped into the fastener holding groove 19 on the large-capacity battery connecting two adjacent poles and the shell, and the pushing part 222 is pushed toward the fixing part 221 by screwing the threaded fastener to shorten the distance between the pushing part 222 and the fixing part 221, and then the pole heat conducting parts 15 on the large-capacity battery connecting two adjacent poles and the shell are brought close together and in close contact, so that multiple large-capacity batteries connected to the shell are connected in series. When the large-capacity batteries connected to the shell are working normally, the heat generated is conducted to the evaporation end of the heat pipe 6 through the pole heat conducting part 15, and is conducted to the condensation end through the heat pipe 6. The heat at the condensation end is evenly distributed through the heat spreader 21 and dissipated through the refrigeration mechanism 7 to prevent the temperature accumulated inside the battery from being too high.

[0099] The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments and is not intended to limit the present invention. For those skilled in the art, several simple deductions or replacements can be made without departing from the concept of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be deemed to fall within the scope of patent protection of the present invention as determined by the submitted claims.

Claims

1. A large-capacity battery with a pole connected to the shell, characterized in that: The battery comprises a housing and a pole body. The top of the housing is open, and an upper cover is provided at the top opening of the housing. The side walls of the housing, the bottom wall of the housing and the upper cover together form a battery accommodating cavity. The upper cover is provided with a liquid filling port and an explosion vent. The pole body includes a positive pole and a negative pole, which are respectively arranged on two opposite side walls of the shell; one side of the pole body passes through the shell side wall of the shell and extends to the outside of the shell side wall; the pole body is provided with a pole heat conducting portion and a pole welding portion, the pole welding portion is placed in the inner cavity of the shell, and the pole heat conducting portion passes through the shell side wall and extends to the outside of the shell side wall; A plurality of battery cells are arranged in the battery accommodating cavity, and the plurality of battery cells are connected in parallel through the electrode welding portion; The pole heat conducting portion is provided with a heat pipe plugging groove along the height direction, a heat pipe is plugged into the heat pipe plugging groove, and the condensation end of the heat pipe extends to the outside of the heat pipe plugging groove.

2. The large-capacity battery with a terminal connected to a housing as claimed in claim 1, characterized in that: A rectangular ring edge is provided at the connection between the pole heat conducting portion and the pole welding portion, and the rectangular ring edge surrounds the pole body.

3. The large-capacity battery with the pole connected to the shell as claimed in claim 2, characterized in that: The pole heat conducting portion is fixedly connected to the side wall of the shell through an upper panel.

4. The large-capacity battery with the pole connected to the shell as claimed in claim 3, characterized in that: A lower gasket is provided between the shell side wall and the pole welding portion; and an upper gasket is provided between the pole heat conducting portion and the upper panel.

5. The large-capacity battery with the pole connected to the shell as claimed in claim 4, characterized in that: A pole through-hole is provided on the side wall of the shell, and a first concave platform and a second concave platform are provided in sequence from the outside to the inside of the pole through-hole; a second sealing surface, a first sealing surface and a lower gasket insulating surface are provided on the lower gasket; a sealing surface and an upper gasket insulating surface are provided on the upper gasket; the pole welding portion is in contact with the lower gasket insulating surface of the lower gasket, the lower end surface of the rectangular ring edge is in contact with the first sealing surface of the lower gasket, and the side surface of the rectangular ring edge is in contact with the second sealing surface of the lower gasket; the pole heat conducting portion is in contact with the upper gasket insulating surface of the upper gasket, and the upper end surface of the first concave platform is connected to the upper panel through the sealing surface of the upper gasket.

6. The large-capacity battery with the pole connected to the shell as claimed in claim 5, characterized in that: The thickness of the rectangular ring edge is the same as the thickness of the second concave platform.

7. The large-capacity battery with the pole connected to the shell as claimed in claim 6, characterized in that: The upper panel, the upper washer and the first concave platform are all provided with rivet holes, and the upper panel, the upper washer and the first concave platform are fixedly connected by rivets passing through the rivet holes.

8. The large-capacity battery with the terminal connected to the housing as claimed in claim 7, characterized in that: The upper washer and the lower washer are both insulating plastic parts or insulating rubber parts.

9. The large-capacity battery with the terminal connected to the housing as claimed in claim 8, characterized in that: The battery cell comprises a battery cell body, and the tabs on the battery cell body are connected to the pole welding portion through a busbar.

10. The large-capacity battery with the terminal connected to the shell as claimed in claim 9, characterized in that: The busbars include positive busbars and negative busbars, and there are multiple positive busbars and multiple negative busbars. Multiple positive busbars are arranged in parallel on the battery cell body, and multiple negative busbars are arranged in parallel on the battery cell body. The pole body includes a positive pole and a negative pole. The battery cell body is connected to the pole welding part of the positive pole through multiple positive busbars, and the battery cell body is connected to the pole welding part of the negative pole through multiple negative busbars.

11. The large-capacity battery with a terminal connected to a housing as claimed in claim 10, characterized in that: There are two positive busbars and two negative busbars.

12. The large-capacity battery with the terminal connected to the housing according to claim 11, characterized in that: The positive electrode busbar and the negative electrode busbar both have an L-shaped cross section.

13. The large-capacity battery with a terminal connected to a housing as claimed in claim 12, characterized in that: A supporting portion is provided between the battery core and the bottom wall of the shell.

14. The large-capacity battery with a terminal connected to a housing as claimed in claim 13, characterized in that: The condensing end of the heat pipe is provided with a refrigeration mechanism, and the portion of the heat pipe plugged into the heat pipe plugging groove is coated with thermal conductive silicone grease.

15. The large-capacity battery with a terminal connected to a housing as claimed in claim 14, characterized in that: The condensing end of the heat pipe is connected to the refrigeration mechanism through a heat spreader.

16. The large-capacity battery with a terminal connected to a housing as claimed in claim 15, characterized in that: The heat spreader is provided with a heat pipe through-hole, and the heat pipe passes through the heat pipe through-hole and is connected to the refrigeration mechanism.

17. The large-capacity battery with a terminal connected to a housing as claimed in claim 16, characterized in that: The cross section of the heat pipe perforation is rectangular.

18. The large-capacity battery with a terminal connected to a housing as claimed in claim 17, characterized in that: The two opposite ends of the pole heat conducting part are provided with fastener holding grooves; the side of the pole heat conducting part away from the pole welding part is provided with an arc-shaped fastening groove, and the arc surface of the arc-shaped fastening groove is not greater than 180°.

19. A large-capacity battery series structure, characterized in that: The invention comprises a plurality of large-capacity batteries with connected poles and a shell as claimed in claim 18, wherein two adjacent large-capacity batteries with connected poles and a shell are connected in series via a fastening connection mechanism.

20. The large-capacity battery series structure according to claim 19, characterized in that: The fastening connection mechanism includes a fixing part, a pushing part and a threaded fastener. The ends of the fixing part and the pushing part are both provided with a snap-in tongue, and the snap-in tongue of the fixing part is arranged opposite to the snap-in tongue of the pushing part. The snap-in tongue on the fixing part and the snap-in tongue on the pushing part are respectively placed in the fastener holding grooves on the large-capacity battery connecting two adjacent poles to the shell; the fixing part and the pushing part are connected by a threaded fastener.

21. The large-capacity battery series structure according to claim 20, characterized in that: The threaded fastener includes a threaded rod and a nut. One end of the threaded rod is fixedly connected to the fixing portion, and the other end passes through the pushing portion and is limited by the nut. The threaded rod is threadedly connected to the pushing portion.

22. The large-capacity battery series structure according to claim 21, characterized in that: The fixing portion is provided with a sliding groove, and an end portion of the pushing portion opposite to the locking tongue is placed in the sliding groove.

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