CN219696680U

CN219696680U - High-safety lithium power battery with PTC external structure

Info

Publication number: CN219696680U
Application number: CN202321043906.2U
Authority: CN
Inventors: 李宝玉; 谢群; 徐爽
Original assignee: Shihlien Chemical Industrial Jiangsu Co
Current assignee: Shilian Special Battery Energy Huai'an Co ltd
Priority date: 2023-05-05
Filing date: 2023-05-05
Publication date: 2023-09-15
Anticipated expiration: 2033-05-05

Abstract

The utility model relates to a high-safety lithium power battery with a PTC external structure, and belongs to the technical field of lithium ion power batteries. The battery is characterized by mainly solving the problem that short-circuit protection is lacking in the existing product, and the battery comprises a battery body formed by a shell, a winding core, an end cover and a conductive component, wherein the conductive component comprises a bus bar arranged inside the shell and a plastic support plate arranged outside the shell, a lower conductive sheet, a PTC (Positive temperature coefficient) sheet, an upper conductive sheet and an upper plastic plate are sequentially arranged inside the plastic support plate from bottom to top, an upper cover plate is arranged at the top end of the plastic support plate, and a pole is arranged at the center of the upper cover plate. According to the utility model, through the external PTC sheet structure, the internal current of the lithium power battery has a current reducing effect when the internal current is excessive, so that phenomena such as explosion, ignition, liquid leakage and the like of the battery caused by the excessive current are effectively prevented. Meanwhile, the PTC sheet structure is arranged externally, so that the influence of heating of the PTC sheet on the inside of the battery is avoided.

Description

High-safety lithium power battery with PTC external structure

Technical Field

The utility model relates to the technical field of lithium ion power batteries, in particular to a high-safety lithium power battery with a PTC external structure.

Background

In recent years, the sales volume of new energy automobiles is increased in an explosive manner, and the rapid development of the power battery industry is driven. As the heart of new energy automobiles, high energy density of lithium power batteries is always pursued in the battery industry, and safety problems brought by the improvement of the energy density of the batteries are valued by industry personnel.

The lithium power battery has the main flow characteristics of high energy density and long service life, and also has outstanding performances in the aspects of environmental protection, safety and stability. The charge and discharge of lithium power batteries are stable for most of the time, however, the internal composition of the battery and the chemical reaction during charge and discharge are also expected to have certain safety risks. Short circuit is the most common fault of lithium ion power battery, and when short circuit happens, high current causes heat in a loop to accumulate rapidly, and a circuit is burnt out to cause fire. Meanwhile, high temperature is generated in the battery due to high current, so that pressure in the battery is suddenly increased, and risks such as explosion even occur.

Therefore, the safety performance of the lithium ion power battery is improved, and especially the safety performance is important to the aspect of targeted protection of short circuit.

Disclosure of Invention

The utility model aims to solve the problems in the background technology and provides a high-safety lithium power battery with a PTC external structure.

The technical scheme of the utility model is as follows: the utility model provides a high security lithium power battery of external structure of PTC, includes the battery body that comprises casing, reel core, end cover and conductive component, conductive component is including setting up in the inside busbar of casing and setting up in the outside plastic layer board of casing, the inside of plastic layer board has set gradually conducting strip, PTC piece, upper conducting strip and last plastic board from bottom to top, the upper cover plate is installed on the top of plastic layer board, and the centre of a circle department of upper cover plate is provided with the utmost point post, be provided with a plurality of rivets that are used for the fixed on the upper cover plate, and the bottom of rivet extends into the inside of casing to set up on the busbar.

Preferably, the winding core is arranged in the shell, and the winding core is positioned below the bus bar.

Preferably, the end cover comprises a lower plastic plate and a lower cover plate, the lower plastic plate is arranged at the top of the bus bar, and the lower cover plate is arranged at the top of the lower plastic plate and completes the end cover of the shell.

Preferably, the plastic layer board is fixedly connected to the top outer wall of the lower cover plate, a hole is formed in the center of the upper cover plate, the pole is arranged in the hole, a first sealing ring for insulation is arranged in the hole, and the bottom end of the pole penetrates through the upper plastic plate and is contacted with the upper conducting strip.

Preferably, a plurality of through holes are formed in the periphery of the hole and located on the upper cover plate, the bottoms of the through holes sequentially penetrate through the plastic plate, the upper conducting strip, the PTC (Positive temperature coefficient) sheet, the lower conducting strip and the bottom shell wall of the plastic supporting plate, and through holes located on the end cover are formed below the through holes.

Preferably, the top end of the rivet penetrates through the through hole and the through hole, a sealing ring III is arranged in the through hole, and a sealing ring II is arranged in the through hole.

Compared with the prior art, the utility model has the following beneficial technical effects:

through external PTC piece structure, play the effect of falling current when its lithium power battery internal current is too big, and then the effectual emergence of preventing phenomena such as explosion of battery, fire, weeping that lead to because of the electric current is too big. Meanwhile, the PTC sheet structure is arranged externally, so that the influence of heating of the PTC sheet on the inside of the battery is avoided.

Drawings

FIG. 1 is a schematic perspective view of an embodiment of the present utility model;

FIG. 2 is a schematic view of the partial front cross-sectional structure of FIG. 1;

fig. 3 is an enlarged schematic view of a partial structure at a of fig. 2.

Reference numerals: 1. a battery main body; 11. a housing; 12. a winding core; 13. an end cap; 131. a lower plastic plate; 132. a lower cover plate; 14. a conductive assembly; 141. a bus bar; 142. a plastic pallet; 143. a lower conductive sheet; 144. a PTC sheet; 145. an upper conductive sheet; 146. a plastic plate is arranged; 147. an upper cover plate; 148. a rivet; 149. a pole.

Detailed Description

The technical scheme of the utility model is further described below with reference to the attached drawings and specific embodiments.

Example 1

As shown in fig. 1-3, the high-safety lithium power battery with PTC external structure provided by the present utility model comprises a battery body 1 composed of a casing 11, a winding core 12, an end cap 13 and a conductive component 14. The conductive component 14 includes a bus bar 141 disposed inside the housing 11 and a plastic support plate 142 disposed outside the housing 11. The plastic pallet 142 is provided with a lower conductive sheet 143, a PTC sheet 144, an upper conductive sheet 145 and an upper plastic plate 146 in this order from bottom to top. An upper cover plate 147 is arranged at the top end of the plastic supporting plate 142, and a pole 149 is arranged at the center of the upper cover plate 147. The upper cover 147 is provided with a plurality of rivets 148 for fixing, and the bottom ends of the rivets 148 extend into the interior of the housing 11 and are disposed on the bus bars 141.

In the present embodiment, the setting range of the rivets 148 is two to six, and two are employed in the present embodiment.

In this embodiment, the rivet 148 is fixed by a rivet having a stepped structure, and the upper part of the rivet 148 at the step is not conductive and the lower part of the rivet is conductive.

In this embodiment, the PTC sheet 144 (thickness between 0.1 and 3 mm) is a material with a polymer structure having nickel plated copper foil welded on both sides. The PTC sheet 144 is tightly attached to the conductive metal sheet in a serial manner, and is designed outside the end cover 13 to avoid the influence of heat generated by the PTC sheet 144 on the internal structure of the battery and substances such as electrolyte, diaphragm and activity, thereby being beneficial to heat dissipation and protecting the performance of the battery.

The working principle of the high-safety lithium power battery with the PTC external structure based on the first embodiment is as follows: when the battery body 1 is normally operated, the operating current is not more than 80A, at this time, the PTC sheet 144 is not started, the resistance is not more than 0.5mΩ, and the temperature rise is not more than 20 ℃. When a short circuit or other abnormal conditions occur, such as the current in the battery body 1 reaches 120A, the resistance of the PTC sheet 144 is rapidly increased, the final resistance is increased by more than 1000 times, and the current is prevented from passing through, so that the protection of the battery body 1 and a circuit is realized. The operating current of the PTC sheet 144 is between 100A and 160A, and the operating temperature reaches 90 c to 120 c. The PTC sheet 144 can be repeatedly used for protection, and the PTC sheet returns to a low resistance state after the battery circuit is disconnected and the temperature of the PTC sheet is reduced to the ambient temperature, so that the battery body 1 can be restarted when the battery body 1 reaches the operating current.

Example two

As shown in fig. 2-3, based on the first embodiment, this embodiment further includes: the winding core 12 is disposed inside the housing 11, and the winding core 12 is located below the bus bar 141. The end cover 13 includes a lower plastic plate 131 and a lower cover 132, the lower plastic plate 131 is disposed on top of the bus bar 141, the lower cover 132 is disposed on top of the lower plastic plate 131, and the end cover of the housing 11 is completed. The plastic pallet 142 is fixedly connected to the top outer wall of the lower cover 132, and a hole is formed at the center of the upper cover 147. The pole 149 is disposed in the hole, and a first sealing ring for insulation is disposed in the hole. The bottom end of the pole 149 passes through the upper plastic plate 146 and contacts the upper conductive sheet 145.

In this embodiment, the upper and lower portions of the PTC sheet 144 are sealed by the insulating upper plastic plate 146 and plastic pallet 142, and the upper plastic plate 146 and plastic pallet 144 are resistant to electrolyte, high temperature over 150 ℃, and safe and reliable.

Example III

As shown in fig. 3, based on the first or second embodiment, the present embodiment further includes: a plurality of through holes are formed around the hole and located on the upper cover plate 147. The bottom of the through hole sequentially penetrates through the bottom shell walls of the upper plastic plate 146, the upper conductive sheet 145, the PTC sheet 144, the lower conductive sheet 143 and the plastic supporting plate 142, and a through hole positioned on the end cover 13 is formed below the through hole. The top end of rivet 148 passes through the through hole and the through hole, the through hole is provided with a third sealing ring, and the through hole is provided with a second sealing ring.

In this embodiment, the first sealing ring, the second sealing ring and the third sealing ring are all materials for showing insulation effect, and are all made of rubber materials.

In this embodiment, the upper conductive sheet 145 and the lower conductive sheet 143 are respectively located on the upper and lower sides of the PTC sheet 144, and are tightly combined with the PTC sheet 144 to uniformly conduct the butt-joint current to the PTC sheet 144, and simultaneously have a supporting effect on the PTC sheet 144.

The above-described embodiments are merely a few preferred embodiments of the present utility model, and many alternative modifications and combinations of the above-described embodiments will be apparent to those skilled in the art based on the technical solutions of the present utility model and the related teachings of the above-described embodiments.

Claims

1. The utility model provides a high security lithium power battery of external structure of PTC, includes battery body (1) that comprises casing (11), reel core (12), end cover (13) and conductive component (14), its characterized in that: the utility model provides a bus bar, including setting up in inside busbar (141) of casing (11) and setting up in outside plastic layer board (142) of casing (11), the inside of plastic layer board (142) has set gradually down conducting strip (143), PTC piece (144), goes up conducting strip (145) and last plastic board (146) from bottom to top, upper cover plate (147) are installed on the top of plastic layer board (142), and the centre of a circle department of upper cover plate (147) is provided with utmost point post (149), be provided with a plurality of rivets (148) that are used for the fixed on upper cover plate (147), and the bottom of rivet (148) extends into the inside of casing (11) to set up on busbar (141).

2. A high safety lithium power battery of PTC external structure according to claim 1, wherein: the winding core (12) is arranged in the shell (11), and the winding core (12) is positioned below the bus bar (141).

3. A high safety lithium power battery of PTC external structure according to claim 1, wherein: the end cover (13) comprises a lower plastic plate (131) and a lower cover plate (132), wherein the lower plastic plate (131) is arranged at the top of the bus bar (141), and the lower cover plate (132) is arranged at the top of the lower plastic plate (131) and completes the end cover of the shell (11).

4. A high safety lithium power battery of PTC external structure according to claim 3, wherein: the plastic support plate (142) is fixedly connected to the top outer wall of the lower cover plate (132), a hole is formed in the center of the upper cover plate (147), the pole (149) is arranged in the hole, a first sealing ring for insulation is arranged in the hole, and the bottom end of the pole (149) penetrates through the upper plastic plate (146) and is in contact with the upper conducting plate (145).

5. The high-safety lithium power battery with PTC external structure according to claim 4, wherein: the periphery of the hole is provided with a plurality of through holes positioned on the upper cover plate (147), the bottoms of the through holes sequentially penetrate through the bottom shell walls of the upper plastic plate (146), the upper conducting plate (145), the PTC (positive temperature coefficient) plate (144), the lower conducting plate (143) and the plastic supporting plate (142), and through holes positioned on the end cover (13) are formed below the through holes.

6. The high-safety lithium power battery with PTC external structure according to claim 5, wherein: the top end of the rivet (148) penetrates through the through hole and the through hole, a sealing ring III is arranged in the through hole, and a sealing ring II is arranged in the through hole.