CN218975716U

CN218975716U - Battery cell

Info

Publication number: CN218975716U
Application number: CN202223055546.6U
Authority: CN
Inventors: 彭韬; 党奎; 陈涛
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2022-11-17
Filing date: 2022-11-17
Publication date: 2023-05-05
Anticipated expiration: 2032-11-17

Abstract

The utility model relates to a battery, which comprises a battery main body, wherein two opposite ends of the battery main body are respectively provided with an end cover, a first electrode and a second electrode are respectively arranged on the two end covers, the first electrode comprises a first electrode body and a connecting column convexly arranged on the first electrode body, the second electrode comprises a second electrode body, a connecting hole is concavely arranged on the second electrode body, and the connecting column can be connected and fixed with the connecting hole. Through set up the spliced pole on the first electrode of battery, set up the connecting hole on the second electrode, the spliced pole can peg graft the cooperation with the connecting hole. The two batteries can be connected and fixed through the connecting column and the connecting hole, so that the process is simplified, and the assembly efficiency of the battery module is improved. Meanwhile, the connecting column is inserted into the connecting hole, so that the contact surface of the connecting column and the connecting hole is large and the connecting hole is firmly connected, and the connection reliability between batteries is improved.

Description

Battery cell

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery.

Background

With the rapid development of new energy power, batteries have become a main direction of development of electric automobiles. The existing cylindrical battery mainly comprises a shell, a winding core and an end cover, wherein the winding core is arranged in the shell, and electrolyte is filled in the shell. The two end covers are respectively covered at two opposite ends of the shell. Each end cover is provided with terminals, namely a positive terminal and a negative terminal, for connection with external electric equipment. When in use, a plurality of batteries are connected in series or in parallel to form a battery module, so that the battery module meets the set current and voltage. In the prior art, a busbar and a terminal on a battery are generally used for laser welding so as to realize that the battery and external electric equipment form an electric path. The prior art has the following defects: the busbar is connected by laser welding, so that the welding quality requirement is high, and the welding process is complex. Because the welding area is smaller, the welding surface between the terminal and the busbar is smaller, and the welding point is easy to fall off due to the influence of external force vibration in the use process of the battery module, so that the circuit is interrupted.

Disclosure of Invention

The utility model aims to provide a battery which is convenient for connection of batteries and has high connection reliability between batteries.

To achieve the purpose, the utility model adopts the following technical scheme:

the battery comprises a battery body, wherein end covers are respectively arranged at two opposite ends of the battery body, a first electrode and a second electrode are respectively arranged on the two end covers, the first electrode comprises a first electrode body and a connecting column protruding on the first electrode body, the second electrode comprises a second electrode body, a connecting hole is concavely formed in the second electrode body, and the connecting column can be fixedly connected with the connecting hole.

Further, an external thread is arranged on the connecting column, and an internal thread matched with the external thread is arranged on the wall of the connecting hole, so that the connecting column and the connecting hole can be in threaded connection.

Further, one end of the first electrode body, which is away from the battery main body, is a first side surface, the first side surface protrudes out of the end cover and is away from one side surface of the battery main body, the connecting column is positioned on the first side surface, and a first welding area for welding a busbar is formed between the edge of the first side surface and the connecting column;

the one end that the second electrode body deviates from the battery main part is the second side, the second side protrusion in the end cover deviates from the battery main part one side, the connecting hole is seted up on the second side, and makes the edge of second side with form between the connecting hole and be used for the welding the second welded zone of busbar.

Further, one end of the second electrode body facing the battery body extends into the battery body, and a distance from the one end of the second electrode body facing the battery body to the end cover is larger than a distance from the second side face to the end cover.

Further, the first electrode further includes a first fastener detachably connected with the connection post so that the bus bar can be fixed on the first electrode by the first fastener, and the second electrode further includes a second fastener detachably connected with the connection hole so that the bus bar can be fixed on the second electrode by the second fastener.

Further, the first fastener is a nut, and the second fastener is a screw.

Further, on the spliced pole with the pore wall of spliced pore, one of them is provided with the card protruding, another be provided with the protruding complex draw-in groove of card, the spliced pole with the spliced pore passes through the card protruding with the draw-in groove joint.

Further, in the two end covers, one end cover is provided with a liquid injection hole, and the other end cover is provided with an explosion-proof valve.

Further, the explosion-proof valve is arranged on the end cover corresponding to the second electrode.

Further, the battery further comprises a winding core and a shell, the winding core is arranged in the shell, the two end covers are respectively covered at two opposite ends of the shell, and the tab on the winding core is respectively connected with the first electrode and the second electrode.

Compared with the prior art, the utility model has the beneficial effects that: through set up the spliced pole on the first electrode of battery, set up the connecting hole on the second electrode, the spliced pole can peg graft the cooperation with the connecting hole. The two batteries can be connected and fixed through the connecting column and the connecting hole, so that the process is simplified, and the assembly efficiency of the battery module is improved. Meanwhile, the connecting column is inserted into the connecting hole, so that the contact surface of the connecting column and the connecting hole is large and the connecting hole is firmly connected, and the connection reliability between batteries is improved.

Drawings

Fig. 1 is a front view of a battery according to an embodiment of the present utility model.

Fig. 2 is a cross-sectional view of a battery according to an embodiment of the present utility model.

Fig. 3 is a partial schematic view of a battery according to an embodiment of the present utility model at a first angle.

Fig. 4 is a partial schematic view of a battery according to an embodiment of the present utility model at a second angle.

Fig. 5 is a schematic view of a first electrode according to an embodiment of the utility model.

Fig. 6 is a schematic diagram of a second electrode according to an embodiment of the utility model.

Fig. 7 is a schematic diagram of two batteries in series according to an embodiment of the utility model.

Fig. 8 is a schematic diagram of two batteries connected in parallel according to an embodiment of the present utility model.

In the figure:

1. a first electrode; 11. a first electrode body; 12. a connecting column; 13. a first side; 14. a first fastener; 2. a second electrode; 21. a second electrode body; 22. a connection hole; 23. a second side; 24. a second fastener; 3. a battery main body; 31. a housing; 32. a winding core; 4. an end cap; 41. a liquid injection hole; 42. an explosion-proof valve; 5. and a bus bar.

Detailed Description

In order to make the technical problems solved, the technical scheme adopted and the technical effects achieved by the utility model more clear, the technical scheme of the utility model is further described below by a specific embodiment in combination with the attached drawings.

As shown in fig. 1 to 6, the present utility model provides a battery including a first electrode 1, a second electrode 2, a battery body 3, and an end cap 4. Wherein, battery body 3 includes a cylindrical casing 31 and a winding core 32, winding core 32 is used for converting chemical energy into electric energy, casing 31 is hollow structure, winding core 32 is installed in the inside of casing 31. The two end caps 4 are respectively a positive electrode end cap and a negative electrode end cap, and the two end caps 4 are respectively arranged at two opposite ends of the battery body 3. Specifically, the end caps 4 are mounted at the ends of the housing 31, and a closed cavity for accommodating the winding core 32 and the electrolyte is defined between the housing 31 and the two end caps 4. The first electrode 1 and the second electrode 2 are respectively arranged on the two end covers 4, the first electrode 1 and the second electrode 2 are conductors, and the first electrode 1 and the second electrode 2 are both used for being electrically connected with external electric equipment. One of the first electrode 1 and the second electrode 2 is a positive electrode, and the other is a negative electrode. The first electrode 1 comprises a first electrode body 11 and a connecting column 12 protruding on the first electrode body 11. The second electrode 2 comprises a second electrode body 21, a connecting hole 22 is concavely formed in the second electrode body 21, and the connecting column 12 can be fixedly connected with the connecting hole 22.

In this embodiment, the first electrode 1 is a negative electrode, and the first electrode 1 is disposed on the negative electrode end cap; the second electrode 2 is a positive electrode, and the second electrode 2 is arranged on a positive end cover. Of course, in other embodiments, the first electrode 1 may be a positive electrode and the second electrode 2 may be a negative electrode.

It is understood that the connection post 12 is protruded on the first electrode body 11, and the connection post 12 extends in a direction away from the battery body 3. A connection hole 22 is recessed in the second electrode body 21 to be fitted with the connection post 12. When two batteries are connected in series, the connection post 12 on one battery can be directly connected with the connection hole 22 of the other battery in an inserting way. The connecting mode is convenient to operate, does not need to install a busbar and carry out laser welding on the busbar, is beneficial to simplifying the process, and improves the operation efficiency of assembling a plurality of batteries into a battery module. Meanwhile, the connection in the plugging mode is more stable, compared with the welding mode, the plugging mode is not easy to fall off, and the contact surface of the connection position is large, so that the connection reliability of the battery is high.

Alternatively, referring to fig. 2, a positive end cap and a negative end cap are respectively provided at opposite ends of the case 31 such that a closed cavity is formed between the case 31 and the two end caps 4. The roll core 32 is installed in the cavity, and the roll core 32 is close to the one end of anodal end cover and has anodal ear, and anodal ear passes through the collection flow disc and is connected with the second electrode 2 on the anodal end cover, and the roll core 32 is close to the one end of negative pole end cover and has the negative pole ear, and the negative pole ear passes through the collection flow disc and is connected with the first electrode 1 on the negative pole end cover.

Alternatively, referring to fig. 3 and 5, the first electrode 1 includes a first electrode body 11 and a connection post 12. The first electrode body 11 is mounted on the end cover 4, one end of the first electrode body 11, which is away from the battery body 3, is a first side surface 13, and the first side surface 13 protrudes from one side surface of the end cover 4, which is away from the battery body 3. The connecting post 12 is located on the first side 13, and a first welding area is formed between the edge of the first side 13 and the connecting post 12. It will be appreciated that when it is desired to make a connection by means of welding, the busbar 5 may be mounted on the first electrode 1, with the busbar 5 abutting the first side 13, and the busbar 5 being fixed to the first side 13 by means of laser welding. The first side 13 protrudes from the end cover 4, and after the busbar 5 is mounted on the first electrode 1, the busbar 5 can be spaced from the end cover 4, so as to facilitate mounting and avoid short circuit caused by contact between the busbar 5 and the end cover 4.

The connection post 12 is located at the middle of the first electrode body 11, and the connection post 12 is coaxial with the battery body 3.

The end cap 4 (i.e., the negative electrode end cap) corresponding to the first electrode 1 is further provided with a liquid injection hole 41, and an electrolyte is injected into the battery through the liquid injection hole 41.

Alternatively, as shown with reference to fig. 4 and 6, the second electrode 2 includes a second electrode body 21 and a connection hole 22. The second electrode body 21 is mounted on the end cover 4, one end of the second electrode body 21, which is away from the battery body 3, is a second side surface 23, and the second side surface 23 protrudes from a side surface of the end cover 4, which is away from the battery body 3. The connection hole 22 is located on the second side 23, and a second welding area is formed between the edge of the second side 23 and the connection hole 22. It will be appreciated that when it is desired to make a connection by means of welding, the busbar 5 may be mounted on the second electrode 2, with the busbar 5 abutting the second side 23, and the busbar 5 being fixed to the second side 23 by means of laser welding. The second side 23 protrudes from the end cap 4, and after the bus bar 5 is mounted on the second electrode 2, the bus bar 5 can be spaced from the end cap 4 to facilitate mounting and prevent the bus bar 5 from contacting the end cap 4 to cause a short circuit.

The connection hole 22 is located at the middle of the second electrode body 21, and the connection hole 22 is coaxial with the battery body 3.

An explosion-proof valve 42 is further provided on the end cap 4 (i.e., the positive electrode end cap) corresponding to the second electrode 2, and when the battery is short-circuited and gas is generated inside the battery, the pressure can be released through the explosion-proof valve 42.

Alternatively, referring to fig. 6, the second electrode body 21 extends toward one end of the battery body 3 to the inside of the battery body 3, and the distance from the end of the second electrode body 21 toward the battery body 3 to the end cap 4 is greater than the distance from the second side 23 to the end cap 4. It will be appreciated that the positive tab on the winding core 32 is located at the end of the winding core 32 facing the positive end cap, and there is a gap between the winding core 32 and the positive end cap to accommodate the tab and a bus plate for mounting the tab. By extending one end of the second electrode body 21 into the battery body 3, the gap between the winding core 32 and the positive electrode end cap is advantageously utilized. Meanwhile, the distance from one end of the second electrode body 21, which faces the battery body 3, to the end cover 4 is larger than the distance from the second side surface 23 to the end cover 4, namely, most of the second electrode body 21 is positioned in the gap between the winding core 32 and the positive end cover, and a small part of the second electrode body 21 protrudes out of the end cover 4, so that the processing depth of the connecting hole 22 is ensured, the length of the whole battery can be shortened, and the battery space is reasonably utilized.

The explosion-proof valve 42 is provided on the end cap 4 corresponding to the second electrode 2. I.e. the explosion proof valve 42 is provided on the positive terminal cover. It will be appreciated that the explosion-proof valve 42 is more complex in structure and occupies a larger space than the liquid filling hole 41. The second electrode body 21 is provided with a connection hole 22 extending toward the inside of the battery body 3, so that the second electrode body 21 also occupies a large space in the battery. The explosion-proof valve 42 with larger occupied space and the second electrode 2 are arranged on the same end cover 4, which is beneficial to saving the whole space of the battery.

In one embodiment, referring to fig. 5 and 6, the connecting post 12 is provided with external threads, i.e., the connecting post 12 is a stud. The wall of the connecting hole 22 is provided with internal threads, namely, the connecting hole 22 is a screw hole. The external threads of the connection post 12 mate with the internal threads of the connection hole 22 so that the connection post 12 can be threadedly coupled with the connection hole 22. Referring to fig. 7, when a plurality of batteries are connected in series, in two adjacent batteries, the connecting post 12 of one battery can be connected with the connecting hole 22 of the other battery by screw, so that the battery is convenient to install, and the battery can be prevented from falling off due to external vibration, and the connection reliability of the battery is high.

Referring to fig. 8, the first electrode 1 further includes a first fastener 14, the first fastener 14 is a nut, and the first fastener 14 is detachably connected to the connection post 12. The second electrode 2 further includes a second fastening member 24, the second fastening member 24 being a screw, the second fastening member 24 being detachably connected to the connection hole 22. When the two batteries are connected in parallel, the first electrodes 1 of the two batteries are respectively connected with two ends of the busbar 5, and the busbar 5 is fixed on the first electrodes 1 through the first fastener 14; and the second electrodes 2 of the two batteries are respectively connected to both ends of the bus bar 5, and the bus bar 5 is fixed to the second electrodes 2 by the second fasteners 24. When two batteries are connected in series, and the first electrode 1 of one battery and the second electrode 2 of the other battery are positioned at the same end of the batteries, the first electrode 1 of one battery and the second electrode 2 of the other battery can be respectively connected and fixed with two ends of the busbar 5. In this embodiment, the first fastener 14 and the second fastener 24 are used to fix the busbar 5, so that the contact surface of the connection position is larger than that of the welding fixing method, and the connection is stable and not easy to fall off.

In another embodiment, the connecting post 12 is provided with a clamping protrusion, and the wall of the connecting hole 22 is provided with a clamping groove, and the clamping groove is matched with the clamping protrusion, so that the connecting post 12 can be clamped and fixed through the clamping protrusion and the clamping groove after being inserted into the connecting hole 22. This structure can quickly realize the series connection between the two batteries.

Referring to fig. 7 and 8, when the batteries are combined to form a battery module, the connection form between the adjacent two batteries includes, but is not limited to, the following:

in the first connection mode, two batteries are connected in series, and the two batteries are coaxial. The connecting column 12 of one battery is inserted into the connecting hole 22 of the other battery, and the connecting column 12 and the connecting hole 22 can be connected and fixed in a threaded connection or clamping manner;

in the second connection mode, two batteries are connected in series, and the two batteries are arranged side by side. The first electrode 1 of one of the cells and the second electrode 2 of the other cell are connected to both ends of the bus bar 5, respectively. Specifically, both ends of the bus bar 5 are welded to the first side 13 of the first electrode 1 and the second side 23 of the second electrode 2, respectively;

in a third connection mode, two batteries are connected in series, and the two batteries are arranged side by side. The first electrode 1 of one of the cells and the second electrode 2 of the other cell are connected to both ends of the bus bar 5, respectively. Specifically, the connecting post 12 of the first electrode 1 is screwed with a nut, the busbar 5 is clamped between the nut and the first side 13, the connecting hole 22 of the second electrode 2 is screwed with a screw, and the busbar 5 is clamped between the screw and the second side 23;

in a fourth connection mode, two batteries are connected in parallel, and the two batteries are arranged side by side. The first electrodes 1 at the same ends of the two batteries are respectively connected with two ends of the bus bar 5, and the second electrodes 2 at the same ends of the two batteries are respectively connected with two ends of the bus bar 5. The connection means include welding and connection using fasteners.

The remarkable effects of this embodiment are: by providing the connection post 12 on the first electrode 1 of the battery and the connection hole 22 on the second electrode 2, the connection post 12 can be mated with the connection hole 22 in a plug-in manner. The two batteries can be connected and fixed through the connecting column 12 and the connecting hole 22, which is beneficial to simplifying the process and improving the assembly efficiency of the battery module. Meanwhile, the connecting post 12 is inserted into the connecting hole 22, so that the contact surface of the connecting post and the connecting hole is large and the connection is stable, and the connection reliability between batteries is improved.

The foregoing is merely exemplary of the present utility model, and those skilled in the art should not be considered as limiting the utility model, since modifications may be made in the specific embodiments and application scope of the utility model in light of the teachings of the present utility model.

Claims

1. The utility model provides a battery, its characterized in that includes the battery body, the both ends that the battery body is relative are provided with the end cover respectively, two be provided with first electrode and second electrode on the end cover respectively, first electrode includes first electrode body and protruding the locating spliced pole on the first electrode body, the second electrode includes the second electrode body, the second electrode body indent is equipped with the connecting hole, just the spliced pole can with the connecting hole is connected fixedly.

2. The battery according to claim 1, wherein the connecting post is provided with external threads, and the wall of the connecting hole is provided with internal threads which are matched with the external threads, so that the connecting post and the connecting hole can be connected in a threaded manner.

3. The battery of claim 2, wherein an end of the first electrode body facing away from the battery body is a first side surface protruding from the end cap and facing away from a side surface of the battery body, the connecting post is located on the first side surface, and a first welding area for welding a busbar is formed between an edge of the first side surface and the connecting post;

4. The battery of claim 3, wherein an end of the second electrode body facing the battery body extends into the battery body and a spacing of the end of the second electrode body facing the battery body to the end cap is greater than a spacing of the second side to the end cap.

5. The battery of claim 2, wherein the first electrode further comprises a first fastener detachably connected to the connection post to enable the bus bar to be secured to the first electrode by the first fastener, and the second electrode further comprises a second fastener detachably connected to the connection hole to enable the bus bar to be secured to the second electrode by the second fastener.

6. The battery of claim 5, wherein the first fastener is a nut and the second fastener is a screw.

7. The battery according to claim 1, wherein one of the connecting post and the wall of the connecting hole is provided with a clamping protrusion, and the other is provided with a clamping groove matched with the clamping protrusion, and the connecting post is clamped with the connecting hole through the clamping protrusion and the clamping groove.

8. The battery of any one of claims 1 to 7, wherein one of the end caps is provided with a fill port and the other end cap is provided with an explosion-proof valve.

9. The battery of claim 8, wherein the explosion-proof valve is disposed on the end cap corresponding to the second electrode.

10. The battery of claim 8, further comprising a winding core and a housing, wherein the winding core is disposed in the housing, two end caps are respectively disposed at opposite ends of the housing, and tabs on the winding core are respectively connected to the first electrode and the second electrode.