CN214706018U

CN214706018U - Lithium ion power battery

Info

Publication number: CN214706018U
Application number: CN202120468056.5U
Authority: CN
Inventors: 徐德雷; 李聪利; 蔡惠群
Original assignee: Yinlong New Energy Co Ltd
Current assignee: Yinlong New Energy Co Ltd
Priority date: 2021-03-03
Filing date: 2021-03-03
Publication date: 2021-11-12
Anticipated expiration: 2031-03-03

Abstract

The utility model discloses a lithium ion power battery, including the shell, be provided with central spool in the shell, central spool outer wall winding electricity core, the both ends of electric core set up anodal polar plate and negative pole polar plate respectively, and anodal polar plate and negative pole polar plate welded fastening respectively have anodal utmost point post and the negative pole utmost point post that has the convex part, and the convex part extends to and makes anodal utmost point post and negative pole utmost point post and electric core fixed in the central spool. The utility model provides a lithium ion power battery, the battery cell volume energy is lower, sets up the screw thread structure of current battery positive, negative pole post as laser welding's boss structure, improves battery cell volume energy density and quality energy density; the defects of the battery cell grouping process are improved, and the grouping reliability and consistency are improved. The structure change of the anode pole and the cathode pole solves the problems of voltage fluctuation, large charge-discharge differential pressure, large internal resistance and the like when the batteries are connected in series and in parallel to form a group, improves the volume energy density of a single battery and improves the labor efficiency.

Description

Lithium ion power battery

Technical Field

The utility model relates to a lithium cell technical field, in particular to lithium ion power battery.

Background

With the vigorous development of electric vehicles and energy storage industries, the endurance mileage of electric vehicles becomes the focus of attention, and the lightweight battery box is undoubtedly the key for improving the endurance mileage. The battery box of the pure electric vehicle mainly comprises batteries, a connection row connected in series and parallel among the batteries, a battery management system and a heat dissipation or heating system, wherein the weight of the batteries accounts for about 70-85% of the proportion of the whole battery box, so that the weight or the volume of the batteries is reduced, the mass energy density and the volume energy density of the batteries are improved, and the cruising range of the pure electric vehicle is greatly improved.

Among the prior art cylinder lithium titanate battery just, negative pole utmost point post are in groups through screw fastening with single battery series-parallel connection, lead to battery utmost point post longer, and the holistic bulk density of battery is lower, and screw fastening has the big and big quality problems of uniting of voltage fluctuation and internal resistance that screw thread not screwed up, screw thread smooth tooth etc. leads to.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a lithium ion power battery, solve the lithium ion power battery who mentions in the background art just, negative pole utmost point post leads to the big poor problem of quality in groups of voltage fluctuation through the screw-thread fastening.

In order to achieve the above object, the present invention provides a lithium ion power battery, which comprises:

the utility model provides a lithium ion power battery, includes the shell, is provided with central spool in the shell, and central spool outer wall winding electricity core has set gradually positive pole piece, barrier film and negative pole piece on the central spool outer wall, and the both ends of electricity core are provided with anodal utmost point ear and negative pole utmost point ear respectively, are provided with the polar plate on anodal utmost point ear and the negative pole utmost point ear respectively, and the polar plate is connected with anodal utmost point post and the negative pole utmost point post that has the convex part respectively, and the convex part makes anodal utmost point post and negative pole utmost point post and electricity core fixed in extending to central spool.

Furthermore, the polar plate includes the current collector, and the welding has the reference column on the current collector, and the polar plate is fixed respectively at the anodal utmost point ear and the negative pole utmost point ear of electric core, and the reference column joint is in the interior hexagonal hole in the central spool.

Furthermore, an anode guide plate is arranged on the polar plate, and a positioning ring is arranged on the anode guide plate.

Furthermore, one end of the positive pole lug is fixedly provided with a positive pole column, and one end of a convex part arranged on the positive pole column penetrates out of the through holes of the positioning ring and the positive guide plate and is inserted into the hole of the positioning column after being welded.

Furthermore, one end of the positive pole lug is provided with a positive pole cover plate.

Further, a sealing gasket is arranged between the anode pole and the anode cover plate.

Furthermore, the material of the sealing gasket is epoxy resin pouring sealant, plastic or rubber.

Furthermore, the material of the central scroll is plastic.

The utility model discloses a lithium ion power battery has following advantage: the utility model provides a lithium ion power battery, the battery cell volume energy is lower, sets up the screw thread structure of current battery positive, negative pole post as laser welding's boss structure, improves battery cell volume energy density and quality energy density; the defects of the battery cell grouping process are improved, and the grouping reliability and consistency are improved. The structure change of the anode pole and the cathode pole solves the problems of overlarge voltage fluctuation and large internal resistance when the batteries are connected in series and parallel in groups, improves the volume energy density of a single battery and improves the labor efficiency.

Drawings

Fig. 1 is a cross-sectional view of a lithium ion power battery of the present invention;

fig. 2 is a schematic structural diagram of the lithium ion power battery of the present invention;

fig. 3 is a top view of the lithium ion power battery of the present invention;

fig. 4 is a bottom view of the lithium ion power battery of the present invention.

The reference numbers in the figures illustrate: 1. a central reel; 11. a central tube; 12. heat-shrinkable sleeving; 2. an electric core; 21. a positive electrode tab; 22. a negative electrode tab; 3. a polar plate; 31. a positioning column; 32. a collector plate; 4. a positive pole column; 5. a negative electrode post; 6. a positive electrode cover plate; 7. a negative electrode cover plate; 8. a housing; 9. a gasket; 10. a positive electrode baffle; 101. and (6) positioning rings.

Detailed Description

In order to better understand the purpose, structure and function of the present invention, the following description is made in detail with reference to the accompanying drawings.

As shown in fig. 1 to 4, the utility model provides a lithium ion power battery, which comprises an outer shell 8, be provided with central spool 1 in the shell 8, central spool 1 includes hexagonal center tube 11 of integrated into one piece and has the thermal contraction characteristic sleeve pipe, positive pole piece has set gradually on the 1 outer wall of central spool, barrier film and negative pole piece, the both ends of electric core 2 are provided with anodal utmost point ear 21 and negative pole utmost point ear 22 respectively, be provided with polar plate 3 on anodal utmost point ear 21 and the negative pole utmost point ear 22 respectively, polar plate 3 is connected with anodal utmost point post 4 and the negative pole post 5 that have the convex part respectively, the convex part makes anodal utmost point post 4 and negative pole post 5 and electric core 2 fixed in extending to central spool 1.

The polar plate 3 comprises a current collecting plate 32, positioning columns 31 are welded on the current collecting plate 32, the polar plate 3 is respectively fixed on the positive pole lug 21 and the negative pole lug 22 of the electric core 2, and the positioning columns 31 at two ends are clamped in hexagonal socket holes in the central scroll 1.

The anode guide plate 10 with the three-dimensional structure in the shape of a Chinese character mi is arranged on the polar plate 3, the positioning ring 101 is arranged on the anode guide plate 10, and the anode guide plate 10 comprises a circular hole matched with the positioning ring 101 and a circular hole for guiding flow.

The fixed anodal utmost point post 4 that is provided with of one end of anodal utmost point ear 21, the convex part one end that sets up on anodal utmost point post 4 is worn out the welding back from the through-hole of position circle 101 and anodal guide plate 10 and is inserted the reference column 31 is downthehole, negative pole post 5 is fixed on the polar plate 3 of negative pole utmost point ear 22 end, and the convex part one end of negative pole post 5 inserts the downthehole of reference column 31.

The utility model provides a length of anodal utmost point post 4 and negative terminal post 5 is different from anodal utmost point post 4 and negative terminal post 5 among the prior art, anodal utmost point post 4 and negative terminal post 5 adopt the mode and the 2 welded fastening of electricity core of nut fastening usually among the prior art, and anodal utmost point post 4 and negative terminal post 5's length is longer, the length with anodal utmost point post 4 and negative terminal post 5 reduces and is provided with the convex part at anodal utmost point post 4 and negative terminal post 5's tip simultaneously, and then convex part and 2 fixed connection of electricity core, anodal utmost point post 4 and the structure that negative terminal post 5 set up to having the convex part that will have the longer screw post of length from this, thereby make the structure of lithium cell simple and compact more, the processing cost is low.

One end of the positive pole tab 21 is provided with a positive pole cover plate 6, the other end of the positive pole post 4 penetrates out of the through hole of the positive pole cover plate 6, and an insulating sealing gasket 9 is arranged between the positive pole post 4 and the positive pole cover plate 6; the negative pole apron 7 is fixed in the shell 8 is close to the one end of negative pole utmost point ear 22, the other end of negative pole post 5 is followed the through-hole of negative pole apron 7 is worn out, just negative pole post 5 with sealing connection between the negative pole apron 7.

The insulating gasket 9 is made of epoxy resin pouring sealant, plastic or rubber.

The material of the central scroll 1 is plastic. The polar plate 3, the anode pole 4, the cathode pole 5, the anode cover plate 6, the cathode cover plate 7, the shell 8 and the anode guide plate 10 are made of aluminum alloy.

Due to the structural change of the anode pole 4 and the cathode pole 5, the problems of overlarge voltage fluctuation and large internal resistance when batteries are connected in series and in parallel in a group are solved, the energy density of a single battery is improved by about more than 25% compared with the anode pole 4 and the cathode pole 5 which are fastened by threads, and the processing working hours of the anode pole and the cathode pole can be reduced by about more than 30%.

The utility model provides a high volume energy density lithium ion power battery, the holistic volume energy density of battery box and the promotion of quality energy density when being favorable to the battery in groups.

It is to be understood that the present invention has been described with reference to certain embodiments, and that various changes or equivalents may be substituted for elements thereof by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application are intended to be covered by the present invention.

Claims

1. The utility model provides a lithium ion power battery, a serial communication port, including shell (8), be provided with central spool (1) in shell (8), central spool (1) outer wall winding electric core (2), positive pole piece has set gradually on central spool (1) outer wall, barrier film and negative pole piece, the both ends of electric core (2) are provided with anodal utmost point ear (21) and negative pole utmost point ear (22) respectively, be provided with polar plate (3) on anodal utmost point ear (21) and negative pole utmost point ear (22) respectively, polar plate (3) are connected with anodal utmost point post (4) and negative pole post (5) that have the convex part respectively, the convex part extends to and makes anodal utmost point post (4) and negative pole post (5) and electric core (2) fixed in central spool (1).

2. The lithium ion power battery according to claim 1, wherein the pole plate (3) comprises a current collecting plate (32), positioning columns (31) are welded on the current collecting plate (32), the pole plate (3) is respectively fixed on a positive pole tab (21) and a negative pole tab (22) of the battery core (2), and the positioning columns (31) are clamped in hexagonal socket holes in the central reel (1).

3. The lithium ion power battery according to claim 2, characterized in that the pole plate (3) is provided with a positive guide plate (10), and the positive guide plate (10) is provided with a positioning ring (101).

4. The lithium ion power battery according to claim 3, wherein one end of the positive electrode tab (21) is fixedly provided with a positive electrode post (4), and one end of a convex part arranged on the positive electrode post (4) penetrates through the through holes of the positioning ring (101) and the positive electrode guide plate (10) and is welded and then inserted into the hole of the positioning column (31).

5. The lithium-ion power battery as claimed in claim 4, characterized in that one end of the positive electrode tab (21) is provided with a positive electrode cover plate (6).

6. The lithium ion power battery according to claim 5, characterized in that a sealing gasket (9) is arranged between the positive pole post (4) and the positive cover plate (6).

7. The lithium ion power battery as claimed in claim 6, wherein the material of the sealing gasket (9) is epoxy resin potting adhesive, plastic or rubber.

8. The lithium-ion power battery as claimed in claim 1, characterized in that the material of the central reel (1) is plastic.