CN-122000647-A - Battery with embedded temperature fuse and battery module

CN122000647ACN 122000647 ACN122000647 ACN 122000647ACN-122000647-A

Abstract

The invention discloses a battery with a built-in temperature fuse and a battery module, and belongs to the technical field of lithium ion batteries. The battery cell is provided with a temperature fuse, and the temperature fuse is connected in series between the positive electrode lug and the positive electrode or between the negative electrode lug and the negative electrode, and is characterized in that the temperature fuse is fused when the internal temperature of the battery cell exceeds a set thermal runaway blocking threshold value. The invention has the advantages that the temperature fuse is arranged in the battery core loop, the internal temperature rise can be responded quickly and accurately, the circuit is cut off in time, the thermal runaway is effectively prevented, and the safety of the body of the battery core is greatly improved. The safety performance of the module formed by the battery cell is obviously enhanced.

Inventors

XU ZHONGHOU
XU YOUSHENG
ZHANG YINMING
YANG JIANKUN

Assignees

厦门赛尔特电子股份有限公司

Dates

Publication Date: 20260508
Application Date: 20260213

Claims (13)

1. A battery with embedded temperature fuse, comprising a shell, at least one electric core and a temperature fuse, wherein the electric core and the temperature fuse are arranged in the shell; the battery cell comprises a first electrode, a second electrode, a first tab and a second tab; The temperature fuse is arranged on the battery cell, the first end of the temperature fuse is electrically connected with the second electrode, the second end of the temperature fuse is electrically connected with the second electrode, so that the temperature fuse is connected in series in a circuit path between the second electrode and is used for fusing when the internal temperature of the battery cell exceeds a set thermal runaway blocking threshold; the first tab and the second tab are led out from the shell to form positive and negative electrodes of the battery.
2. The battery with embedded temperature fuse as recited in claim 1, the temperature fuse is characterized in that the temperature fuse is embedded in the battery cell.
3. The battery with embedded temperature fuse as recited in claim 2, wherein said battery cell is a wound lithium battery cell comprising an electrode assembly wound from a first electrode, a second electrode and a separator disposed therebetween.
4. The battery with embedded temperature fuse according to claim 1, further comprising a second electrode lead-out conductor for electrically connecting the second electrode and the temperature fuse, wherein one end of the temperature fuse is electrically connected to the second electrode through the second electrode lead-out conductor, and a second end of the temperature fuse is electrically connected to the second electrode.
5. The battery of claim 4, wherein the second electrode lead conductor is a separate tab having one end electrically connected to the second electrode and the other end electrically connected to the first end of the thermal fuse.
6. The battery with embedded temperature fuses as recited in claim 5, wherein the temperature fuses are a plurality of, two ends of the temperature fuses are respectively electrically connected with the connecting sheet and the antenna of the second lug, and are distributed inside the battery cell.
7. The battery of claim 3, wherein the second tab includes an inner section extending into the electrode assembly, and wherein a contact surface of the inner section with the second electrode is covered with an insulating layer.
8. The battery with embedded temperature fuse as claimed in claim 4, wherein, The temperature fuse is attached to the surface of the battery cell; The second electrode lead-out conductor is a middle tab arranged on the battery cell; One end of the middle tab is connected with the second electrode, and the other end of the middle tab extends out of the battery core and is electrically connected with the first end of the temperature fuse; the second lug is electrically connected with the other end of the temperature fuse.
9. The battery with embedded temperature fuse according to claim 8, wherein the first tab, the second tab and the temperature fuse are arranged on the same end face of the battery cell, the part of the middle tab extending out of the battery cell is close to the surface of the battery cell and is electrically connected with one end of the temperature fuse, and the other end of the temperature fuse is directly electrically connected with the second tab.
10. The battery with embedded temperature fuses according to claim 8, wherein the first electrode lug and the second electrode lug are respectively arranged on two end faces of the battery core, the temperature fuses are arranged in the middle of the surface of the battery core, the part, extending out of the battery core, of the middle electrode lug is attached to the surface of the battery core and then is electrically connected with one end of the temperature fuses, and the other end of the temperature fuses is electrically connected with the second electrode lugs.
11. The battery with embedded temperature fuses as recited in claim 10, wherein the battery comprises a plurality of cells, the cells are stacked, two adjacent cells are in a group, the two cells share a second lug in a group, and the temperature fuses corresponding to the two cells are arranged between the two cells.
12. The battery with embedded temperature fuses according to claim 8, wherein the battery core comprises a plurality of winding units, each winding unit is provided with a group of first lugs and middle lugs, the first lugs are overlapped after the two adjacent winding units are overlapped, the connecting pieces of the two adjacent winding units are electrically connected with one end of the temperature fuse after being overlapped, the other end of the temperature fuse is electrically connected with the second lugs, the two adjacent winding units share the second lugs, and the end faces of the temperature fuse are respectively contacted with the surfaces of the battery cores of the two adjacent winding units.
13. A battery module, characterized in that the battery module is formed by connecting a plurality of the battery cells embedded with the temperature fuse according to any one of claims 1 to 12 in series and/or in parallel.

Description

Battery with embedded temperature fuse and battery module Technical Field The invention relates to the technical field of lithium ion batteries, in particular to a battery embedded with a temperature fuse and a battery module formed by the battery. Background The lithium battery is widely applied to the fields of consumer electronics, new energy automobiles, energy storage systems and the like due to the advantages of high energy density, light weight, flexible design and the like. However, lithium batteries are prone to cause rapid internal heat rise under abusive conditions such as overcharging, short-circuiting, or external impact, leading to thermal runaway, and even serious safety accidents such as fire and explosion. In order to improve the safety of the battery, a temperature fuse is often arranged on an external circuit or a tab of the battery in the prior art. However, the fuse generally adopts an overcurrent protection mode, has a slow response speed, cannot timely sense the temperature change of the inner core area of the battery, and has the problem of protection hysteresis. When a severe short circuit has occurred inside, the internal local overheating causes thermal runaway, which cannot be blocked by the hysteresis response of the fuse, leading to protection failure. In addition, the complex structure inside the battery may cause the metal connection member to be exposed, causing an internal short-circuit risk. Therefore, there is an urgent need for a lithium battery structure capable of rapidly and precisely responding to the internal temperature change of the battery, and fundamentally cutting off the circuit while having higher internal safety. Disclosure of Invention The invention aims to provide a battery with an embedded temperature fuse and a battery module, which are used for solving the problems of lag response, unreliable protection and high internal short circuit risk of the temperature fuse in the prior art. In order to achieve the above purpose, the invention adopts the following technical scheme: In a first aspect, the invention features a battery having a temperature fuse embedded therein, including a housing, and at least one cell and a temperature fuse disposed within the housing; the battery cell comprises a first electrode, a second electrode, a first tab and a second tab; The temperature fuse is arranged on the battery cell, the first end of the temperature fuse is electrically connected with the second electrode, the second end of the temperature fuse is electrically connected with the second electrode, so that the temperature fuse is connected in series in a circuit path between the second electrode and is used for fusing when the internal temperature of the battery cell exceeds a set thermal runaway blocking threshold; the first tab and the second tab are led out from the shell to form positive and negative electrodes of the battery. Further, the temperature fuse is embedded inside the battery cell. Further, the battery also comprises a second electrode lead-out conductor used for electrically connecting the second electrode and the temperature fuse, one end of the temperature fuse is electrically connected with the second electrode through the second electrode lead-out conductor, and the second end of the temperature fuse is electrically connected with the second electrode lug. Further, the battery core is a winding type lithium battery core and comprises an electrode assembly formed by winding a first electrode, a second electrode and a diaphragm arranged between the first electrode and the second electrode. Further, the second electrode lead-out conductor is an independent connecting sheet, one end of the connecting sheet is electrically connected with the second electrode, and the other end of the connecting sheet is electrically connected with the first end of the temperature fuse. Further, an insulating protective shell is packaged outside the temperature fuse; the insulation protection shell extends to cover and wrap the connection part of the thermal fuse and the connecting sheet and the connection part of the thermal fuse and the second lug. Further, the temperature fuses are multiple, two ends of the multiple temperature fuses are respectively and electrically connected with the connecting sheet and the antenna of the second electrode lug, and the temperature fuses are distributed in the battery cell. Further, the second electrode tab includes an inner section extending into the electrode assembly, and a contact surface of the inner section with the second electrode is covered with an insulating layer. Further, the temperature fuse is attached to the surface of the battery cell; The second electrode lead-out conductor is a middle tab arranged on the battery cell; one end of the middle tab is connected with the second electrode, and the other end of the middle tab is electrically connected with the first end of the temperature fuse; the second lug is electrical