High-safety lithium ion battery and battery pack

Abstract

The invention provides a high-safety lithium ion battery and a battery pack, a fuse is arranged on a positive electrode and / or a negative electrode of the lithium ion battery, and the lithium ion battery can be cut off from a circuit by fusing the fuse. According to the lithium ion battery, when abnormal working conditions such as overcharge, overcurrent or high temperature are ready to occur or just occur, the lithium ion battery can be cut off from a circuit by fusing the fuse of the lithium ion battery, so that occurrence or continuation of the phenomena of overcharge, overcurrent or high temperature of the battery is avoided, and the safety performance of the battery is improved. According to the battery pack comprising the lithium ion battery, any one lithium ion battery can be cut off from a circuit by fusing the fuse of the lithium ion battery, so that the safety of the whole battery pack is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of batteries, and in particular relates to a highly safe lithium-ion battery and a battery pack. Background Art

[0002] In order to achieve the dual carbon goals as soon as possible, my country is developing new energy sources such as wind power and solar energy. However, new energy power generation has the disadvantages of intermittent and high volatility. Large-scale grid connection will have a great impact on the power grid. In order to solve the shortcomings of unstable new energy power generation, new energy storage technologies have been born. Lithium-ion batteries have been widely used in the fields of electrochemical energy storage and power batteries due to their advantages such as long life and high energy density. However, lithium-ion batteries are not absolutely safe. When overcharging, high temperature and other abuse conditions occur, the side reactions inside the battery will be aggravated, a large amount of gas will be generated, and the temperature and pressure inside the battery will increase, eventually causing thermal runaway of the battery, and in severe cases, fire and other safety accidents. At present, most battery manufacturers will install explosion-proof valves on the top cover of the battery, which will actively crack and release pressure before the battery thermal runaway occurs. However, under overcharging conditions, this treatment method can only delay the time when the battery thermal runaway occurs.

[0003] In addition, the batteries currently on the market have a hole-punch design (fuse design) on the adapter to achieve the fusing of the battery cell tabs and the adapter, but this design may fail when the battery has thermal runaway, or because after the battery cell tabs are disconnected from the adapter, the distance between the battery cell tabs and the connecting sheet is too close to achieve effective insulation and generate an arc. Summary of the invention

[0004] The purpose of the present invention is to provide a highly safe lithium-ion battery and battery pack. The lithium-ion battery of the present invention can be cut off from the circuit by blowing its own fuse when an abnormal operating condition such as overcharge, overcurrent or high temperature is about to occur or has just occurred, thereby avoiding the occurrence or continuation of battery overcharge, overcurrent or high temperature, thereby improving the safety performance of the battery. In a battery pack containing the lithium-ion battery of the present invention, any one of the lithium-ion batteries of the present invention can be cut off from the circuit by blowing its own fuse, thereby improving the safety of the entire battery pack.

[0005] The purpose of the present invention is achieved through the following technical solutions.

[0006] The first invention provides a lithium-ion battery, wherein a fuse is provided on the positive electrode and / or the negative electrode of the lithium-ion battery, and the lithium-ion battery can be cut off from the circuit by blowing the fuse.

[0007] In some specific embodiments of the present invention, the fuse disposed at the positive electrode of the lithium-ion battery and the fuse disposed at the negative electrode of the lithium-ion battery are not the same fuse.

[0008] In some embodiments of the present invention, the lithium-ion battery includes a protective shell, a battery cell, a top cover and a base; the top cover includes a cover plate and a positive electrode column and a negative electrode column arranged on the cover plate; the battery cell includes a winding core and a positive electrode tab and a negative electrode tab connected to the winding core.

[0009] When a fuse is provided on the positive electrode of the lithium-ion battery, the fuse is provided between the positive electrode column and the positive electrode tab.

[0010] When a fuse is provided on the negative electrode of the lithium-ion battery, the fuse is provided between the negative electrode pole and the negative electrode tab.

[0011] In some embodiments of the present invention, the positive electrode column and the positive electrode tab, and the negative electrode column and the negative electrode tab are connected by any of the following methods:

[0012] Method 1: The positive pole is connected to the positive pole ear through the fuse and the positive pole adapter in sequence, and the negative pole is connected to the negative pole ear through the negative pole adapter;

[0013] Method 2: The positive pole is connected to the positive pole ear through the positive pole adapter, and the negative pole is connected to the negative pole ear through the fuse and the negative pole adapter in turn;

[0014] Method 3: The positive pole is connected to the positive pole ear through the fuse and the positive pole adapter in sequence, and the negative pole is connected to the negative pole ear through the fuse and the negative pole adapter in sequence;

[0015] Method 4: The positive pole is connected to the positive pole ear through the positive pole adapter and the fuse in turn, and the negative pole is connected to the negative pole ear through the negative pole adapter;

[0016] Method 5: The positive pole is connected to the positive pole ear through the positive pole adapter, and the negative pole is connected to the negative pole ear through the negative pole adapter and the fuse in turn;

[0017] Method 6: The positive pole is connected to the positive pole ear through the positive pole adapter and the fuse in turn, and the negative pole is connected to the negative pole ear through the negative pole adapter and the fuse in turn;

[0018] Method 7: The positive pole is connected to the positive pole ear through the positive pole adapter, and the negative pole is connected to the negative pole ear through the fuse;

[0019] Method 8: The positive pole is connected to the positive pole ear through a fuse, and the negative pole is connected to the negative pole ear through a negative pole adapter;

[0020] Method nine: The positive pole is connected to the positive pole ear through a fuse; the negative pole is connected to the negative pole ear through a fuse;

[0021] Method 10: The positive pole is connected to the positive pole lug through the positive pole adapter, the negative pole is connected to the negative pole lug through the negative pole adapter, and the fuse is integrated into the positive pole and / or the negative pole.

[0022] In some embodiments of the present invention, the fuse includes an insulating shell, an upper top cover piece, a lower top cover piece, and a fuse, wherein the upper and lower sides of the insulating shell are respectively connected to the upper top cover piece and the lower top cover piece to form a shell structure of the fuse; the fuse is placed inside the shell structure formed by the insulating shell and the upper top cover piece and the lower top cover piece, and the two ends of the fuse are respectively connected to the upper top cover piece and the lower top cover piece, so that the upper top cover piece and the lower top cover piece form a passage in the fuse through the fuse.

[0023] In some embodiments of the present invention, the fuse is connected to the circuit outside the fuse through the upper cover plate and the lower cover plate, one of which serves as an input end and the other as an output end; for example, when the positive pole is connected to the positive pole lug through the fuse, the upper cover plate of the fuse is connected to the positive pole pole and the lower cover plate is connected to the positive pole lug, or, when the negative pole is connected to the negative pole lug through the fuse, the upper cover plate of the fuse is connected to the negative pole pole and the lower cover plate is connected to the negative pole lug; preferably, the connection is made by welding.

[0024] In some embodiments of the present invention, the material of the fuse is selected from a conductive alloy with a low melting point, preferably a conductive alloy with a melting point between 100 and 300° C., and more preferably a tin alloy.

[0025] The overcurrent capability and melting point of the fuse can be selected according to the material system, capacity, internal temperature change before thermal runaway, etc. of the lithium-ion battery, and are not specifically limited in the present invention. Those skilled in the art can select or set them according to the purpose of the lithium-ion battery.

[0026] In some embodiments of the present invention, the material of the insulating shell is selected from insulating materials such as insulating ceramics that can be used for fuses of lithium-ion batteries.

[0027] In some embodiments of the present invention, the shapes and sizes of the upper cover sheet, the lower cover sheet and the insulating shell can be adjusted according to the shapes and sizes of the lithium-ion battery poles (positive poles and negative poles), such as circular, rectangular, etc.; for example, when the shapes of the upper cover sheet, the lower cover sheet and the insulating shell are all circular, the upper cover sheet, the lower cover sheet and the insulating shell are connected to form a hollow cylindrical shell, and the fuse is placed inside the hollow cylindrical shell.

[0028] In some embodiments of the present invention, the materials of the upper cover sheet and the lower cover sheet are independently selected from copper, aluminum, other conductive metals or alloys.

[0029] In some specific embodiments of the present invention, when the fuse is set on the positive electrode of the lithium-ion battery, the upper cover plate and the lower cover plate of the fuse are both made of aluminum; when the fuse is set on the negative electrode of the lithium-ion battery, the upper cover plate and the lower cover plate of the fuse are both made of copper.

[0030] In some embodiments of the present invention, the positive electrode adapter plate is made of aluminum.

[0031] In some embodiments of the present invention, the negative electrode adapter plate is made of copper.

[0032] In some embodiments of the present invention, an explosion-proof valve is further provided on the cover plate; preferably, the explosion-proof valve is provided at the center of the cover plate; more preferably, the explosion value of the explosion-proof valve is 0.1-1.0 MPa.

[0033] In some embodiments of the present invention, the lithium-ion battery further comprises a heating device connected to the fuse, and the heating device is used to heat a fuse of the fuse of the lithium-ion battery.

[0034] In some specific embodiments of the present invention, the heating device is connected to the upper cover plate and / or the lower cover plate of the fuse, so that the upper cover plate and / or the lower cover plate of the fuse can be heated by the heating device to thereby blow the fuse of the fuse.

[0035] In some embodiments of the present invention, the lithium-ion battery further includes a monitoring probe for monitoring the status of the lithium-ion battery.

[0036] In some embodiments of the present invention, the monitoring probe includes at least one of a voltage monitoring probe, a temperature monitoring probe, an internal resistance monitoring probe, a pressure monitoring probe, and the like.

[0037] In some embodiments of the present invention, the monitoring probe is integrated into the top cover of the lithium-ion battery.

[0038] In some embodiments of the present invention, the lithium-ion battery further includes a control chip.

[0039] In some embodiments of the present invention, the heating device is connected to the control chip.

[0040] In some embodiments of the present invention, the monitoring probe is connected to the control chip; preferably, the lithium-ion battery further includes a monitoring chip, and the monitoring probe is connected to the control chip via the monitoring chip.

[0041] In some embodiments of the present invention, the control circuit formed by the heating device, the control chip, the monitoring probe and the optional monitoring chip is connected to the positive and negative electrodes of the lithium-ion battery to realize powering the control circuit with the power of the lithium-ion battery itself.

[0042] In some embodiments of the present invention, the control circuit formed by the heating device, the control chip, the monitoring probe and the optional monitoring chip is connected to the external circuit of the lithium-ion battery to supply power to the control circuit.

[0043] In a second aspect, the present invention provides a battery pack, wherein the battery pack comprises the lithium-ion battery described in the first aspect.

[0044] In some embodiments of the present invention, the number of lithium-ion batteries included in the battery pack according to the first aspect is 1 or more, preferably 1 to 100, and more preferably 1 to 20, for example 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20.

[0045] In some specific embodiments of the present invention, the battery pack is composed of the lithium-ion battery described in the first aspect.

[0046] In some embodiments of the present invention, the battery pack further includes a management system, and the management system is used to manage one or more batteries in the battery pack.

[0047] In some specific embodiments of the present invention, the management system establishes a communication connection with a control chip of the lithium-ion battery it manages.

[0048] In some specific embodiments of the present invention, the communication connection includes the management system controlling, through the control chip, a heating device for heating a fuse of a fuse that blows the lithium-ion battery; preferably, it includes controlling the start and stop of heating of the heating device.

[0049] In some specific embodiments of the present invention, the communication connection includes the control chip uploading parameters about the lithium-ion battery obtained by a monitoring probe used to monitor the status of the lithium-ion battery to the management system; preferably, the parameters include at least one of voltage, temperature, internal resistance, and pressure.

[0050] In some specific embodiments of the present invention, the communication connection includes the management system receiving and collating parameters about the lithium-ion battery monitored by the monitoring probe, and when it is predicted that the lithium-ion battery is about to experience abnormal conditions such as overcharging, overcurrent, overheating, etc., actively starting a heating device for heating the fuse of the fuse to heat the upper top cover plate and / or the lower top cover plate of the fuse to thereby blow the fuse of the fuse.

[0051] In some specific embodiments of the present invention, the communication includes modifying protection parameters in the control chip through the management system.

[0052] The beneficial effects of the present invention are as follows:

[0053] The present invention provides a novel lithium-ion battery, wherein a fuse is provided on the positive electrode and / or the negative electrode of the lithium-ion battery, for example, between the positive electrode column and the positive electrode tab and / or between the negative electrode column and the negative electrode tab, and the lithium-ion battery can be cut off from the circuit by melting the fuse. When the lithium-ion battery is in abnormal operating conditions such as overcharge, overcurrent or high temperature, the heat generated by the lithium-ion battery itself will melt the fuse of the fuse, leaving the battery cell in an open circuit state, thereby actively cutting off the lithium-ion battery from the circuit.

[0054] In the lithium-ion battery of the present invention, since the fuse of the fuse is placed inside the shell structure formed by the insulating shell and the upper and lower top cover sheets, the fuse remains inside the shell structure after being blown and will not fall on the battery cell, thereby effectively avoiding the occurrence of a short circuit in the battery cell caused by the fuse falling. Moreover, due to the barrier effect of the insulating shell, even if an arc occurs when the fuse is blown, it will not ignite the electrolyte inside the lithium-ion battery or cause other safety accidents.

[0055] In addition, when the lithium-ion battery also includes a heating device connected to the fuse, the lithium-ion battery can be cut off from the circuit by heating the fuse of the fuse by the heating device. When the lithium-ion battery also includes a monitoring probe for monitoring the state of the lithium-ion battery, the current state of the lithium ions can be monitored by the monitoring probe, so as to provide conditions for predicting the abnormal working conditions of the lithium-ion battery. Furthermore, the monitoring probes of the present invention, such as the voltage monitoring probe, the temperature monitoring probe, the internal resistance monitoring probe, and the pressure monitoring probe, are integrated into the top cover of the lithium-ion battery, which can more accurately measure the internal voltage, temperature, internal resistance, and pressure of the battery. When the heating device and the monitoring probe are both connected to the control chip, it is convenient to establish a communication connection between the management system of the battery pack and the control chip of the lithium-ion battery when the lithium-ion battery is used in the battery pack, and then use the management system of the battery pack to monitor the state of the lithium-ion battery and intervene in time to stop charging and discharging or start the heating device to heat the fuse of the fuse when an abnormal working condition occurs.

[0056] The battery pack of the present invention includes the lithium-ion battery of the present invention. Any of the lithium-ion batteries of the present invention can be cut off from the circuit by blowing its own fuse, thereby improving the safety of the entire battery pack. The battery pack of the present invention also includes a management system for managing more than one battery in the battery pack. When the management system establishes communication with the control chip of the lithium-ion battery it manages, the heating device can be started or shut down through the management system, and the parameters of the lithium-ion battery monitored by the monitoring probe can be uploaded to the management system, so that the management system can more accurately grasp the state of the lithium-ion battery, so that when the lithium-ion battery has an abnormal operating condition or is predicted to be about to have an abnormal operating condition, the management system is requested to stop charging and discharging before the fuse of the fuse is automatically blown. If the management system does not respond, the heating device is automatically started to heat the fuse of the fuse; in addition, the protection parameters in the control chip can be modified through the management system to achieve enhanced protection of the lithium-ion battery in special scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 It is a schematic diagram of the overall structure of the lithium-ion battery of the present invention.

[0058] Figure 2 A schematic diagram of the top cover.

[0059] Figure 3 A schematic diagram of a fuse.

[0060] Figure 4 It is a schematic diagram of the connection method between the positive electrode post 6 and the positive electrode tab 14, and between the negative electrode post 7 and the negative electrode tab 15 when the connection method is method three.

[0061] Figure 5 The invention is a connection structure composed of a positive electrode heating device of a lithium-ion battery, a positive electrode heating device, a control chip, a monitoring chip, a monitoring probe and a management system (BMS system) for managing a battery pack of the lithium-ion battery.

[0062] The markings in the attached figure are: 1. Protective shell; 2. Battery cell; 3. Top cover; 4. Base; 5. Cover plate; 6. Positive pole; 7. Negative pole; 8. Explosion-proof valve; 9. Upper top cover; 10. Lower top cover; 11. Insulating shell; 12. Fuse; 13. Winding core; 14. Positive pole ear; 15. Negative pole ear; 16. Positive adapter plate; 17. Negative adapter plate; 18. Positive fuse; 19. Negative fuse. DETAILED DESCRIPTION

[0063] The following examples further illustrate the technology of the present invention. These examples are for illustration and example of the present invention and are not intended to limit the scope of the present invention in any form.

[0064] The endpoints and any values ​​of the ranges disclosed in the present invention are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be regarded as specifically disclosed in the present invention.

[0065] Example 1

[0066] A lithium ion battery, the overall structure diagram of which is as follows Figure 1 As shown, the lithium-ion battery includes a protective shell 1, a battery cell 2, a top cover 3 and a base 4 of the lithium-ion battery.

[0067] The schematic diagram of the top cover 3 is as follows Figure 2 As shown, the top cover 3 includes a cover plate 5 and a positive pole 6, a negative pole 7, and an explosion-proof valve 8 arranged on the cover plate 5; wherein the explosion-proof valve 8 is arranged at the center of the cover plate 5, and the positive pole 6 and the negative pole 7 are respectively arranged on both sides of the explosion-proof valve 8.

[0068] The battery cell 2 includes a winding core 13 and a positive electrode tab 14 and a negative electrode tab 15 connected to the winding core 13 .

[0069] A positive electrode fuse 18 is disposed (or connected) between the positive electrode post 6 and the positive electrode tab 14 , and / or a negative electrode fuse 19 is disposed (or connected) between the negative electrode post 7 and the negative electrode tab 15 .

[0070] The schematic diagram of the positive electrode fuse 18 and the negative electrode fuse 19 is as follows: Figure 3 As shown, the positive fuse 18 and the negative fuse 19 each include an upper cover sheet 9 and a lower cover sheet 10, an insulating shell 11, and a fuse 12; the upper side of the insulating shell 11 is directly connected to the upper cover sheet 9, and the lower side is directly connected to the lower cover sheet 10, thereby forming a closed shell structure; the fuse 12 is placed inside the closed shell structure formed by the insulating shell 11 and the upper cover sheet 9 and the lower cover sheet 10, and the two ends of the fuse 12 are respectively connected to the upper cover sheet 9 and the lower cover sheet 10, so that the upper cover sheet 9 and the lower cover sheet 10 form a passage in the fuse through the fuse 12.

[0071] The material of the fuse 12 is tin alloy.

[0072] The insulating shell 11 is made of insulating ceramic.

[0073] The upper cover plate 9 and the lower cover plate 10 of the positive electrode fuse 18 are both made of aluminum.

[0074] The upper cover sheet 9 and the lower cover sheet 10 of the negative electrode fuse 19 are both made of copper.

[0075] The explosion value of the explosion-proof valve 8 is 0.5 MPa.

[0076] The connection between the positive electrode column 6 and the positive electrode tab 14, and between the negative electrode column 7 and the negative electrode tab 15 is any one of the following connection methods:

[0077] Method 1: The positive pole 6 is connected to the positive pole ear 14 through the upper cover plate 9 of the positive pole fuse 18, the fuse 12 of the positive pole fuse 18, the lower cover plate 10 of the positive pole fuse 18 and the positive pole adapter plate 16 in sequence, and the negative pole 7 is connected to the negative pole ear 15 through the negative pole adapter plate 17.

[0078] Method 2: The positive pole 6 is connected to the positive pole ear 14 through the positive pole adapter 16, and the negative pole 7 is connected to the negative pole ear 15 through the upper cover plate 9 of the negative pole fuse 19, the fuse 12 of the negative pole fuse 19, the lower cover plate 10 of the negative pole fuse 19 and the negative pole adapter 17 in sequence.

[0079] Method 3: The positive pole 6 is connected to the positive pole ear 14 in sequence through the upper cover sheet 9 of the positive pole fuse 18, the fuse 12 of the positive pole fuse 18, the lower cover sheet 10 of the positive pole fuse 18 and the positive pole adapter 16, and the negative pole 7 is connected to the negative pole ear 15 in sequence through the upper cover sheet 9 of the negative pole fuse 19, the fuse 12 of the negative pole fuse 19, the lower cover sheet 10 of the negative pole fuse 19 and the negative pole adapter 17. The schematic diagram of this connection method is shown in FIG. Figure 5 shown.

[0080] Method 4: The positive pole 6 is connected to the positive pole ear 14 through the positive pole adapter 16, the upper cover plate 9 of the positive pole fuse 18, the fuse 12 of the positive pole fuse 18 and the lower cover plate 10 of the positive pole fuse 18 in sequence, and the negative pole 7 is connected to the negative pole ear 15 through the negative pole adapter 17.

[0081] Method 5: The positive pole 6 is connected to the positive pole ear 14 through the positive pole adapter 16, and the negative pole 7 is connected to the negative pole ear 15 through the negative pole adapter 17, the upper cover plate 9 of the negative pole fuse 19, the fuse 12 of the negative pole fuse 19 and the lower cover plate 10 of the negative pole fuse 19 in sequence.

[0082] Method six: the positive pole 6 is connected to the positive pole ear 14 in sequence through the positive pole adapter 16, the upper cover plate 9 of the positive pole fuse 18, the fuse 12 of the positive pole fuse 18 and the lower cover plate 10 of the positive pole fuse 18, and the negative pole 7 is connected to the negative pole ear 15 in sequence through the negative pole adapter 17, the upper cover plate 9 of the negative pole fuse 19, the fuse 12 of the negative pole fuse 19 and the lower cover plate 10 of the negative pole fuse 19.

[0083] Method seven: the positive pole 6 is connected to the positive pole ear 14 through the upper cover plate 9 of the positive fuse 18, the fuse 12 of the positive fuse 18 and the lower cover plate 10 of the positive fuse 18 in sequence, and the negative pole 7 is connected to the negative pole ear 15 through the negative adapter plate 17.

[0084] Method eight: the positive pole 6 is connected to the positive pole ear 14 through the positive adapter plate 16, and the negative pole 7 is connected to the negative pole ear 15 through the upper cover plate 9 of the negative fuse 19, the fuse 12 of the negative fuse 19 and the lower cover plate 10 of the negative fuse 19 in sequence.

[0085] Method nine: The positive pole 6 is connected to the positive pole ear 14 in sequence through the upper cover plate 9 of the positive pole fuse 18, the fuse 12 of the positive pole fuse 18 and the lower cover plate 10 of the positive pole fuse 18, and the negative pole 7 is connected to the negative pole ear 15 in sequence through the upper cover plate 9 of the negative pole fuse 19, the fuse 12 of the negative pole fuse 19 and the lower cover plate 10 of the negative pole fuse 19.

[0086] Method ten: the positive pole 6 is connected to the positive pole ear 14 via the positive pole adapter 16 , the negative pole 7 is connected to the negative pole ear 15 via the negative pole adapter 17 , and the positive pole fuse 18 is integrated into the positive pole 6 .

[0087] Method eleven: the positive pole 6 is connected to the positive pole tab 14 via the positive pole adapter 16 , the negative pole 7 is connected to the negative pole tab 15 via the negative pole adapter 17 , and the negative pole fuse 19 is integrated into the negative pole 7 .

[0088] Method 12: The positive pole 6 is connected to the positive pole ear 14 through the positive pole adapter 16, the negative pole 7 is connected to the negative pole ear 15 through the negative pole adapter 17, the positive pole fuse 18 is integrated into the positive pole 6, and the negative pole fuse 19 is integrated into the negative pole 7.

[0089] The material of the positive electrode adapter plate 16 is aluminum.

[0090] The negative electrode adapter plate 17 is made of copper.

[0091] Example 2

[0092] A lithium ion battery, the overall structure diagram of which is as follows Figure 1 As shown, the lithium-ion battery includes a lithium-ion battery protection shell 1, a battery cell 2, a top cover 3 and a base 4.

[0093] The schematic diagram of the top cover 3 is as follows Figure 2 As shown, the top cover 3 includes a cover plate 5 and a positive pole 6, a negative pole 7, and an explosion-proof valve 8 arranged on the cover plate 5; wherein the explosion-proof valve 8 is arranged at the center of the cover plate 5, and the positive pole 6 and the negative pole 7 are respectively arranged on both sides of the explosion-proof valve 8.

[0094] The battery cell 2 includes a winding core 13 and a positive electrode tab 14 and a negative electrode tab 15 connected to the winding core 13 .

[0095] A positive electrode fuse 18 is disposed (or connected) between the positive electrode post 6 and the positive electrode tab 14 , and / or a negative electrode fuse 19 is disposed (or connected) between the negative electrode post 7 and the negative electrode tab 15 .

[0096] The schematic diagram of the positive electrode fuse 18 and the negative electrode fuse 19 is as follows: Figure 3 As shown, the positive electrode fuse 18 and the negative electrode fuse 19 each include an upper cover sheet 9 and a lower cover sheet 10, an insulating shell 11, and a fuse 12; the upper side of the insulating shell 11 is directly connected to the upper cover sheet 9, and the lower side is directly connected to the lower cover sheet 10, thereby forming a closed cylindrical shell structure; the fuse 12 is placed inside the closed cylindrical shell structure formed by the insulating shell 11 and the upper cover sheet 9 and the lower cover sheet 10, and the two ends of the fuse 12 are respectively connected to the upper cover sheet 9 and the lower cover sheet 10, so that a passage is formed between the upper cover sheet 9 and the lower cover sheet 10 in the positive electrode fuse 18 and the negative electrode fuse 19 through the fuse 12.

[0097] The positive pole 6 is connected to the positive pole ear 14 in sequence through the upper cover plate 9 of the positive pole fuse 18, the fuse 12 of the positive pole fuse 18 and the lower cover plate 10 of the positive pole fuse 18, and the negative pole 7 is connected to the negative pole ear 15 in sequence through the upper cover plate 9 of the negative pole fuse 19, the fuse 12 of the negative pole fuse 19 and the lower cover plate 10 of the negative pole fuse 19.

[0098] The material of the fuse 12 is tin alloy.

[0099] The insulating shell 11 is made of insulating ceramic.

[0100] The upper cover plate 9 and the lower cover plate 10 of the positive electrode fuse 18 are both made of aluminum.

[0101] The upper cover sheet 9 and the lower cover sheet 10 of the negative electrode fuse 19 are both made of copper.

[0102] The explosion value of the explosion-proof valve 8 is 0.5 MPa.

[0103] The upper cover sheet 9 and / or the lower cover sheet 10 of the positive electrode fuse 18 are also connected to a positive electrode heating device, and the positive electrode heating device is used to heat and blow the fuse 12 of the positive electrode fuse 18 .

[0104] The upper cover sheet 9 and / or the lower cover sheet 10 of the negative electrode fuse 19 are also connected to a negative electrode heating device, and the negative electrode heating device is used to heat and blow the fuse 12 of the negative electrode fuse 19 .

[0105] The lithium-ion battery also includes a monitoring probe for monitoring the status of the lithium-ion battery; the monitoring probe includes a voltage monitoring probe, a temperature monitoring probe, an internal resistance monitoring probe, and a pressure monitoring probe; the monitoring probe is integrated into the top cover 3 of the lithium-ion battery.

[0106] The lithium-ion battery further comprises a control chip, and the positive electrode heating device and the negative electrode heating device are both connected to the control chip.

[0107] The lithium-ion battery further comprises a monitoring chip, and the monitoring probe is connected to the control chip via the monitoring chip.

[0108] The control circuit formed by the positive electrode heating device, the negative electrode heating device, the control chip, the monitoring probe, and the monitoring chip is connected to the positive electrode and the negative electrode of the lithium ion battery so that the control circuit is powered by the power of the lithium ion battery itself.

[0109] Example 3

[0110] A battery pack, the battery pack consisting of five lithium-ion batteries described in Embodiment 2.

[0111] The battery pack also includes a management system, which is used to manage the five lithium-ion batteries in the battery pack.

[0112] The management system establishes communication with the control chip of each lithium-ion battery.

[0113] The communication connection includes the management system controlling the start and stop of heating of the positive electrode heating device for heating the fuse 12 of the positive electrode fuse 18 and the negative electrode heating device for heating the fuse 12 of the negative electrode fuse 19 through the control chip of each lithium-ion battery.

[0114] The communication connection also includes the control chip of each lithium-ion battery uploading parameters about the lithium-ion battery monitored by its respective monitoring probe for monitoring the status of the lithium-ion battery to the management system; the parameters include voltage, temperature, internal resistance, and pressure.

[0115] The communication connection also includes the management system receiving and collating the parameters of the lithium-ion batteries monitored by the monitoring probe of each lithium-ion battery. When it is predicted that one or several lithium-ion batteries are about to experience abnormal conditions such as overcharging, overcurrent, overheating, etc., the positive electrode heating device is actively started to heat the upper top cover plate 9 and the lower top cover plate 10 of the positive electrode fuse 18 to thereby blow the fuse 12 of the positive electrode fuse 18, and / or the negative electrode heating device is actively started to heat the upper top cover plate 9 and the lower top cover plate 10 of the negative electrode fuse 19 to thereby blow the fuse 12 of the negative electrode fuse 19.

[0116] The communication connection also includes modifying the protection parameters in the control chip of each lithium-ion battery through the management system.

[0117] It should be noted that the embodiments described above are only used to explain the present invention and do not constitute any limitation of the present invention. The present invention has been described with reference to the embodiments, but it should be understood that the words used therein are descriptive and explanatory words, rather than restrictive words. The present invention may be modified as specified within the scope of the claims of the present invention, and the present invention may be revised without departing from the scope and spirit of the present invention. Although the present invention described therein relates to specific methods, materials and embodiments, it does not mean that the present invention is limited to the specific examples disclosed therein, on the contrary, the present invention can be extended to all other methods and applications with the same functions.

Claims

1. A lithium ion battery, characterized in that: A fuse is provided on the positive electrode and / or the negative electrode of the lithium-ion battery, and the lithium-ion battery can be cut off from the circuit by blowing the fuse.

2. The lithium-ion battery according to claim 1, characterized in that The lithium-ion battery comprises a protective shell, a battery cell, a top cover and a base; the top cover comprises a cover plate and a positive electrode column and a negative electrode column arranged on the cover plate; the battery cell comprises a winding core and a positive electrode tab and a negative electrode tab connected to the winding core; When a fuse is provided on the positive electrode of the lithium-ion battery, the fuse is provided between the positive electrode column and the positive electrode tab; And / or, when a fuse is provided on the negative electrode of the lithium-ion battery, the fuse is provided between the negative electrode pole and the negative electrode tab.

3. The lithium-ion battery according to claim 2, characterized in that: The cover plate is also provided with an explosion-proof valve; preferably, the explosion-proof valve is provided at the center of the cover plate; more preferably, the explosion value of the explosion-proof valve is 0.1-1.0 MPa.

4. The lithium ion battery according to claim 2 or 3, characterized in that: The positive electrode post and the positive electrode tab, and the negative electrode post and the negative electrode tab are connected in any of the following ways: Method 1: The positive pole is connected to the positive pole ear through the fuse and the positive pole adapter in sequence, and the negative pole is connected to the negative pole ear through the negative pole adapter; Method 2: The positive pole is connected to the positive pole ear through the positive pole adapter, and the negative pole is connected to the negative pole ear through the fuse and the negative pole adapter in turn; Method 3: The positive pole is connected to the positive pole ear through the fuse and the positive pole adapter in sequence, and the negative pole is connected to the negative pole ear through the fuse and the negative pole adapter in sequence; Method 4: The positive pole is connected to the positive pole ear through the positive pole adapter and the fuse in turn, and the negative pole is connected to the negative pole ear through the negative pole adapter; Method 5: The positive pole is connected to the positive pole ear through the positive pole adapter, and the negative pole is connected to the negative pole ear through the negative pole adapter and the fuse in turn; Method 6: The positive pole is connected to the positive pole ear through the positive pole adapter and the fuse in turn, and the negative pole is connected to the negative pole ear through the negative pole adapter and the fuse in turn; Method 7: The positive pole is connected to the positive pole ear through the positive pole adapter, and the negative pole is connected to the negative pole ear through the fuse; Method 8: The positive pole is connected to the positive pole ear through a fuse, and the negative pole is connected to the negative pole ear through a negative pole adapter; Method nine: The positive pole is connected to the positive pole ear through a fuse; the negative pole is connected to the negative pole ear through a fuse; Method 10: The positive pole is connected to the positive pole lug through the positive pole adapter, the negative pole is connected to the negative pole lug through the negative pole adapter, and the fuse is integrated into the positive pole and / or the negative pole.

5. The lithium ion battery according to any one of claims 1 to 4, characterized in that The fuse comprises an insulating shell, an upper cover sheet, a lower cover sheet, and a fuse; the upper and lower sides of the insulating shell are respectively connected to the upper cover sheet and the lower cover sheet to form a shell structure of the fuse; the fuse is placed inside the shell structure formed by the insulating shell and the upper cover sheet and the lower cover sheet, and the two ends of the fuse are respectively connected to the upper cover sheet and the lower cover sheet, so that the upper cover sheet and the lower cover sheet form a path in the fuse through the fuse; the fuse is connected to the circuit outside the fuse through the upper cover sheet and the lower cover sheet, one of which serves as an input end and the other as an output end.

6. The lithium-ion battery according to claim 5, characterized in that: The material of the fuse is selected from a conductive alloy with a low melting point, preferably a conductive alloy with a melting point between 100 and 300° C., and more preferably a tin alloy; And / or, the insulating shell is made of insulating ceramic; And / or, the materials of the upper cover sheet and the lower cover sheet are independently selected from copper or aluminum; preferably, when the fuse is arranged on the positive electrode of the lithium-ion battery, the materials of the upper cover sheet and the lower cover sheet of the fuse are both aluminum; when the fuse is arranged on the negative electrode of the lithium-ion battery, the materials of the upper cover sheet and the lower cover sheet of the fuse are both copper.

7. The lithium ion battery according to any one of claims 1 to 6, characterized in that The lithium-ion battery further comprises a heating device connected to the fuse, the heating device being used to heat and blow the fuse of the fuse of the lithium-ion battery; preferably, the heating device is connected to the upper cover sheet and the lower cover sheet of the fuse of the lithium-ion battery; And / or, the lithium-ion battery also includes a monitoring probe for monitoring the status of the lithium-ion battery; preferably, the monitoring probe includes at least one of a voltage monitoring probe, a temperature monitoring probe, an internal resistance monitoring probe, and a pressure monitoring probe; and / or, the monitoring probe is integrated into the top cover of the lithium-ion battery.

8. The lithium-ion battery according to claim 7, characterized in that: The lithium-ion battery also includes a control chip; preferably, the heating device is connected to the control chip; and / or, the monitoring probe is connected to the control chip. Further preferably, the lithium-ion battery also includes a monitoring chip, and the monitoring probe is connected to the control chip via the monitoring chip; and / or, a control circuit formed by the heating device, the control chip, the monitoring probe and the optional monitoring chip is connected to the positive and negative electrodes of the lithium-ion battery.

9. A battery pack, characterized in that: The battery pack comprises the lithium-ion battery according to any one of claims 1 to 8; preferably, the battery pack consists of the lithium-ion battery according to any one of claims 1 to 8.

10. The battery pack according to claim 9, characterized in that: The battery pack also includes a management system, which is used to manage more than one battery in the battery pack; preferably, the management system establishes a communication connection with the control chip of the lithium-ion battery it manages; wherein, The communication connection includes the management system controlling, through the control chip, a heating device for heating a fuse of a fuse of the lithium-ion battery; And / or, the communication connection includes the control chip uploading parameters about the lithium-ion battery monitored by a monitoring probe for monitoring the status of the lithium-ion battery to the management system; preferably, the parameters include at least one of voltage, temperature, internal resistance, and pressure; And / or, the communication includes modifying protection parameters in the control chip through the management system.

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