Battery with embedded thermal fuse and battery module

Abstract

The invention discloses a battery with an embedded thermal fuse and a battery module, and belongs to the technical field of lithium ion batteries. A temperature fuse is arranged on the battery cell; the temperature fuse is connected in series between the positive pole lug and the positive pole or between the negative pole lug and the negative pole, and the key point is that the temperature fuse is fused when the internal temperature of the battery core exceeds a set thermal runaway blocking threshold value. According to the invention, the thermal fuse is arranged in the core loop of the battery, so that the internal temperature rise can be quickly and accurately responded, the circuit can be timely cut off, thermal runaway is effectively prevented, and the body safety of the battery cell is greatly improved. The safety performance of the module formed by the battery cell is obviously enhanced.

Description

Technical Field

[0001] This invention relates to the field of lithium-ion battery technology, and in particular to a battery with an embedded thermal fuse and a battery module composed of the battery. Background Technology

[0002] Lithium-ion batteries are widely used in consumer electronics, new energy vehicles, and energy storage systems due to their advantages such as high energy density, light weight, and flexible design. However, under abusive conditions such as overcharging, short circuits, or external impacts, lithium-ion batteries are prone to a rapid increase in internal heat, leading to thermal runaway and even serious safety accidents such as fires and explosions.

[0003] To improve battery safety, existing technologies often incorporate thermal fuses in the external circuitry or on the battery tabs. However, these fuses typically employ overcurrent protection, resulting in a slow response time and an inability to promptly detect temperature changes in the battery's core areas, leading to protection lag. When a severe internal short circuit occurs, localized overheating can cause thermal runaway, which cannot be prevented by the fuse's delayed response, resulting in protection failure. Furthermore, the complex internal structure of the battery may expose metal connectors, posing a risk of internal short circuits.

[0004] Therefore, there is an urgent need for a lithium battery structure that can quickly and accurately respond to changes in the internal temperature of the battery, cut off the circuit at the source, and at the same time have higher internal safety. Summary of the Invention

[0005] The present invention aims to provide a battery and battery module with an embedded thermal fuse to solve the problems of delayed response, unreliable protection, and high risk of internal short circuit in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a battery with an embedded temperature fuse, comprising a housing, and at least one battery cell and a temperature fuse disposed within the housing; The battery cell includes a first electrode, a second electrode, a first tab, and a second tab; The thermal fuse is disposed on the battery cell, with its first end electrically connected to the second electrode and its second end electrically connected to the second tab, thereby making the thermal fuse connected in series in the circuit path between the second electrode and the second tab, for use to melt and break when the internal temperature of the battery cell exceeds the set thermal runaway blocking threshold. The first tab and the second tab extend from the housing to form the positive and negative electrodes of the battery.

[0008] Furthermore, the temperature fuse is embedded inside the battery cell.

[0009] Furthermore, the battery also includes a second electrode lead conductor for electrically connecting the second electrode to the temperature fuse; one end of the temperature fuse is electrically connected to the second electrode through the second electrode lead conductor, and its second end is electrically connected to the second tab.

[0010] Furthermore, the battery cell is a wound lithium battery cell, comprising an electrode assembly formed by winding a first electrode, a second electrode, and a separator placed therebetween.

[0011] Furthermore, the second electrode lead-out conductor is an independent connecting piece, one end of which is electrically connected to the second electrode, and the other end is electrically connected to the first end of the thermal fuse.

[0012] Furthermore, the temperature fuse is externally encapsulated with an insulating protective shell; The insulating protective shell extends to cover and enclose the connection between the thermal fuse and the connecting piece, as well as the connection between the thermal fuse and the second electrode tab.

[0013] Furthermore, there are multiple thermal fuses, with both ends of the multiple thermal fuses electrically connected to the contact plate and the second electrode tab, respectively, and they are distributed inside the battery cell.

[0014] Furthermore, the second electrode tab includes an internal section extending into the electrode assembly; the contact surface between the internal section and the second electrode is covered with an insulating layer.

[0015] Furthermore, the temperature fuse is attached to the surface of the battery cell; The second electrode lead-out conductor is an intermediate electrode tab disposed on the battery cell; One end of the intermediate tab is connected to the second electrode, and the other end is electrically connected to the first end of the thermal fuse. The second electrode is electrically connected to the other end of the temperature fuse.

[0016] Furthermore, the first tab, the second tab, and the thermal fuse are disposed on the same end face of the battery cell. The portion of the middle tab extending out of the battery cell is attached to the surface of the battery cell and electrically connected to one end of the thermal fuse. The other end of the thermal fuse is directly electrically connected to the second tab.

[0017] Furthermore, the first tab and the second tab are respectively disposed on the two end faces of the battery cell, and the thermal fuse is disposed in the middle of the surface of the battery cell; the part of the middle tab extending out of the battery cell is attached to the surface of the battery cell, and then is electrically connected to one end of the thermal fuse directly or through a connecting piece; the other end of the thermal fuse is electrically connected to the second tab directly or through a connecting piece.

[0018] Furthermore, the battery includes multiple cells stacked together, with two adjacent cells forming a group. In a group, two cells share a second tab, and a thermal fuse corresponding to two cells is disposed between the two cells.

[0019] Furthermore, the battery includes multiple cells; the cells are stacked, and the first tab and second tab of each cell are connected in parallel to form the positive and negative electrodes of the battery.

[0020] Furthermore, the battery cell includes multiple winding units, each winding unit having a set of first tabs and intermediate tabs; after two adjacent winding units are stacked, the first tabs overlap; after the connecting pieces of two adjacent winding units are stacked, they are electrically connected to one end of the thermal fuse, and the other end of the thermal fuse is electrically connected to the second tab, and the two adjacent winding units share the second tab; the end face of the thermal fuse contacts the battery cell surface of the two adjacent winding units respectively.

[0021] Secondly, the present invention provides a battery module, characterized in that the battery module is formed by connecting multiple batteries with embedded thermal fuses as described in any one of the above in series and / or parallel.

[0022] Beneficial effects of the present invention 1. Rapid Response and Precise Protection: The thermal fuse is directly embedded inside the battery or on its outer surface and effectively connected to the negative and negative terminals, or the positive and positive terminals, enabling direct and rapid sensing of temperature changes within the battery cell. When the internal battery temperature abnormally rises to the fuse's melting point, the fuse immediately melts, fundamentally cutting off the charging and discharging circuit and preventing thermal runaway. This provides fast response and precise, reliable protection.

[0023] 2. Prevent internal short circuits: The insulating protective shell completely covers all the connecting electrodes of the thermal fuse, effectively preventing the connection points from contacting other battery components due to metal burrs, welding residues, or external pressure, greatly reducing the risk of internal short circuits.

[0024] 3. Multiple safety features: The insulating layer on the tab connected to the temperature fuse ensures electrical insulation between it and the corresponding electrode, avoiding potential internal short circuit paths.

[0025] 4. Supports large-size battery cells: By setting multiple thermal fuses, the temperature changes in various areas of large-size battery cells can be effectively monitored and melted in time to cut off the battery cell current and prevent thermal runaway.

[0026] 5. Wide range of applications: The cells of this invention can be directly used to construct battery modules connected in series and / or parallel. Because each cell possesses an independent and rapid internal protection mechanism, the safety performance of the entire module is significantly improved, making it particularly suitable for high-energy-density battery packs and large-scale energy storage systems with extremely high safety requirements. Attached Figure Description

[0027] Figure 1 This is a three-dimensional schematic diagram (partial section) of the battery cell (square lithium battery) of Embodiment 1 of the present invention.

[0028] Figure 2 This is a schematic diagram of the unfolded state of the internal winding structure of the battery cell in Embodiment 1 of the present invention.

[0029] Figure 3 This is an exploded view of the unfolded state of the internal winding structure of the square lithium battery in Embodiment 1 of the present invention.

[0030] Figure 4 This is a schematic diagram of the integrated component of a single-temperature fuse in Embodiment 1 of the present invention.

[0031] Figure 5 This is a schematic diagram of the structure of an integrated assembly of multiple thermal fuses in Embodiment 2 of the present invention.

[0032] Figure 6 This is a schematic diagram of the battery (external thermal fuse) in Embodiment 3 of the present invention (the thermal fuse is located on the end face of the battery cell).

[0033] Figure 7 This is a schematic diagram of the structure of the battery (external thermal fuse) in Embodiment 4 of the present invention (the thermal fuse is located on the surface of the battery cell).

[0034] Explanation of reference numerals in the attached figures: 1-Positive tab; 2-Negative tab; 3-Insulating layer; 4-Temperature fuse; 5-Insulating protective shell; 51-Top cover; 52-Lower cover; 6-Connecting piece; 7-Negative electrode; 71-Negative electrode current collector; 72-Negative active polarity material layer; 8-Positive electrode; 81-Positive electrode current collector; 82-Positive electrode active material layer; 9-Separator; 100-Cell; 102-Intermediate tab; 103-First tab; 104-Second tab; 200-Temperature fuse; 201, 202-Connecting pieces. Detailed Implementation

[0035] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention, primarily used to illustrate the embodiments and to explain the operating principles of the embodiments in conjunction with the relevant descriptions in the specification. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0036] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0037] Example 1 like Figure 1 , Figure 2 and Figure 3 The diagram shows an unfolded view of a battery with an embedded thermal fuse provided by the present invention. It mainly includes a positive electrode tab 1, a negative electrode tab 2, a positive electrode 8, a negative electrode 7, a separator 9, and a casing (not shown). The positive electrode 8, negative electrode 7, and separator 9 constitute the main body of the battery cell. Specifically, the negative electrode 7 includes a negative electrode current collector 71 and a negative electrode active material layer 72 coated on both sides of the negative electrode current collector 71. The positive electrode 8 includes a positive electrode current collector 81 and a positive electrode active material layer 82 coated on one side of the positive electrode current collector 81. During assembly, the negative electrode 7 is wrapped with two layers of separator 9, forming a stacked structure of positive electrode-separator-negative electrode-separator, before winding or stacking. This design ensures that in the final winding structure, there is always at least one complete separator 9 and the electrolyte carried by the separator between the positive electrode 8 and the negative electrode 7, thereby effectively preventing internal short circuits caused by direct contact between the positive and negative electrodes. The positive electrode active material includes, but is not limited to, one or more of lithium cobalt oxide, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide, and their doped and modified materials. The negative electrode active material includes, but is not limited to, one or more of artificial graphite, natural graphite, hard carbon, and soft carbon.

[0038] The core improvement lies in the installation of a thermal fuse 4 in the core area inside the battery. This thermal fuse 4 is a fused alloy type fuse, whose melting temperature is matched with the set thermal runaway prevention threshold of the battery cell (such as 50℃~130℃). It can quickly melt and break when the temperature in the core area of ​​the battery cell exceeds the thermal runaway prevention threshold, preventing the spread of thermal runaway.

[0039] It should be noted that the design of embedding the thermal fuse 4 within the battery cell is not limited to lithium batteries and can also be adapted to other types of solid-state batteries. Furthermore, the arrangement of the positive and negative electrodes is not limited to the scheme in this embodiment; the positions of the positive and negative electrodes can be interchanged.

[0040] Of course, a separator 9 can also be provided on the exposed surface of the positive electrode 8 and the back of the positive electrode 8 between the positive electrode 8 and the negative electrode 7 to ensure that in the final winding structure, there is always at least one complete separator 9 and one layer of electrolyte carried by the separator between the positive electrode 8 and the negative electrode 7, thereby effectively preventing internal short circuits caused by direct contact between the positive and negative electrodes.

[0041] One end of the thermal fuse 4 is directly connected to the second electrode (i.e., the negative electrode 7) it contacts, and the other end of the thermal fuse 4 is connected to the negative electrode tab 2. The contact surface between the negative electrode tab 2 and the second electrode is covered with an insulating layer 3. More preferably, the inner end of the negative electrode tab 2 that extends into the battery can be completely wrapped with the insulating layer 3 to form a conductive circuit.

[0042] For ease of manufacturing, preferably, the battery cell also includes a second electrode lead conductor, which electrically connects the thermal fuse 4 to the second electrode. In this embodiment, the second electrode lead conductor is a connecting piece 6, which electrically connects the thermal fuse 4 to the second electrode. The connecting piece 6 is a plate-shaped electrode. Preferably, the connecting piece 6, the thermal fuse 4, and the negative electrode tab 2 are pre-connected to form an integrated assembly.

[0043] One end of the thermal fuse 4 is electrically connected to the negative electrode tab 2 by welding (such as laser welding). The other end is also connected to a connecting piece 6 by welding. This connecting piece 6 is preferably made of nickel, copper, aluminum, or their alloys; for example, in this embodiment, a stamped nickel sheet is used. The connecting piece 6 is tightly bonded to the surface of the negative electrode current collector 71 by conductive adhesive bonding, ultrasonic welding, or other methods, thereby forming a stable electrical connection and mechanical fixation with the negative electrode current collector 71. Thus, during battery discharge, the internal current path is: positive electrode 8 → positive electrode tab 1 → [external load] → negative electrode tab 2 → thermal fuse 4 → connecting piece 6 → negative electrode 7. The thermal fuse 4 is connected in series in this internal main circuit.

[0044] Preferably, the thermal fuse 4 can be a standardized component, including an insulating protective shell 5, a molten alloy sheet and two lead electrodes. The thermal fuse 4 is electrically connected to the connecting piece 6 and the negative electrode lug 2 by welding or riveting, respectively, through the two lead electrodes.

[0045] Preferably, the thermal fuse 4 includes a fused alloy sheet and an insulating protective shell 5. The insulating protective shell 5 completely encloses the fused alloy sheet of the thermal fuse 4, as well as the two welding points between the fused alloy sheet and the negative electrode tab 2 and the connecting piece 6, achieving full insulation. At the same time, it fixes the negative electrode tab 2 and the connecting piece 6 together to form an integrated assembly.

[0046] The insulating protective shell 5 includes an upper cover 51 and a lower cover 52, which are preferably made of engineering plastics (such as PPS), ceramics or glass fiber reinforced plastics. In this embodiment, PPS engineering plastic is used to make it by ultrasonic welding.

[0047] To prevent a short circuit between the negative electrode tab 2 and the negative electrode current collector 71, an insulating layer 3 is attached to the contact surface between the inner end of the negative electrode tab 2 extending into the battery and the second electrode (i.e., the negative electrode 7). More preferably, the inner end of the negative electrode tab 2 extending into the battery can be completely covered by the insulating layer 3, achieving electrical isolation between the insulating layer 3 and the current collector of the negative electrode 7. The insulating layer 3 is preferably made of polyimide (PI), polyethylene terephthalate (PET), or polypropylene (PP). In this embodiment, polyimide (PI) film is preferred because it has excellent insulation, high temperature resistance, and chemical stability.

[0048] In this embodiment, as Figure 1 As shown, a single thermal fuse 4 is arranged in the central area where the cell heats up the most, so as to most effectively sense changes in cell temperature.

[0049] Example 2 In another preferred embodiment, such as Figure 5 As shown, to address potential localized overheating issues in large-capacity cells, unlike in Embodiment 1, multiple thermal fuses 4 can be used. These thermal fuses 4 are connected in parallel between the negative electrode tab 2 and the U-shaped second electrode lead-out conductor, which is a connecting piece 6. Similarly, an insulating layer 3 is applied to the contact surface between the negative electrode tab 2 extending into the battery and the second electrode (negative electrode 7). More preferably, the inner end of the negative electrode tab 2 extending into the battery can be completely wrapped with the insulating layer 3, achieving electrical isolation between the insulating layer 3 and the current collector of the negative electrode 7.

[0050] Specifically, in one implementation of this embodiment, eight thermal fuses 4 are provided. These eight thermal fuses 4 are evenly distributed in a double-row array on the battery electrode plane, with the following structure: the connecting piece 6 is through the middle and has comb-shaped electrodes on both sides; the negative electrode tab 2 has corresponding tentacles on the negative electrode surface; the negative electrode tab 2 and the connecting piece 6 extend into the insulating protective shell 5 and are electrically connected by an alloy; the thermal fuses 4 are electrically connected to the comb-shaped electrodes and the tentacles. This design connects multiple thermal fuses 4 in parallel to achieve hierarchical protection. This distribution ensures that the temperature monitoring network can cover most of the battery's operating area, especially the edges and corners that are difficult to cover with a traditional single fuse. When an abnormal temperature occurs at any location inside the battery, one or more of the nearest thermal fuses can quickly sense it and melt, thereby cutting off the local current in time, increasing the current of other parallel fuses, accelerating the action of the parallel fuses, and thus accelerating the overall circuit cutoff. This multi-parallel design can improve the sensitivity and reliability of temperature sensing and prevent the spread of thermal runaway.

[0051] Finally, by connecting multiple cells with the above-described structure in series and parallel via busbars, a highly safe battery module can be assembled. Each cell in this module has independent, fast-response internal overheat protection capabilities, thereby greatly improving the safety level of the entire battery system.

[0052] Example 3: like Figure 6 As shown, the present invention also provides a lithium battery with an embedded thermal fuse, including a cell 100 and a thermal fuse 200. Unlike Embodiment 1, in this embodiment, the second electrode lead-out conductor is an intermediate tab 102.

[0053] The battery cell 100 is a square soft-pack battery cell, which is formed by winding or stacking multiple layers of electrode sheets and separators, and is encapsulated using a flexible multilayer composite film (such as aluminum-plastic film) to form the outer surface of the battery cell.

[0054] The battery cell 100 includes an intermediate tab 102 and a first tab 103 extending from the outer surface of the battery cell, as well as a second tab 104. The intermediate tab 102 and the first tab 103 respectively lead out the positive and negative electrodes of the battery cell 100.

[0055] The thermal fuse 200 is attached to the surface of the battery cell, with its first end and second tab 104 welded together, and its second end welded together with the intermediate tab 102.

[0056] The second tab 104 and the first tab 103 constitute the positive and negative electrodes of the battery.

[0057] It should be noted that the polarity of the first tab 103 and the second tab 104 can be set to positive or negative as needed, and the thermal fuse 200 can be configured to connect to the positive or negative tab of the battery cell 100.

[0058] In this embodiment, the thermal fuse 200, the second tab 104, and the first tab 103 with opposite polarity are disposed on the same side of the outer surface of the battery cell (i.e., the same end face of the battery cell). The two ends of the thermal fuse 200 are directly welded to the intermediate tab 102 and the second tab 104.

[0059] Unlike embodiments 1 and 2, in this embodiment, the thermal fuse 200 is located outside the battery cell, such as on the end face where the battery cell 100 tabs are located, with the thermal fuse 200 lying flat on the end face of the battery cell. The intermediate tab 102 extends from the second electrode and bends at its outer portion, close to the surface of the battery cell. The bent portion of the intermediate tab 102 is electrically connected to one end of the thermal fuse 200. The other end of the thermal fuse 200 is electrically connected to the second tab 104, which extends from a direction perpendicular to the other end of the thermal fuse 200, parallel to and in the same direction as the first tab 103. Of course, in other embodiments, the direction of the first tab 103 and the second tab 104 can be adjusted as needed, such as being led out in opposite directions or perpendicular to each other.

[0060] After assembly, the thermal fuse 200 is fixedly attached to the outer surface of the battery cell. In this embodiment, it can not only quickly receive abnormal temperatures inside the battery cell, but also receive abnormal temperatures generated by the environment in a timely manner. When the temperature reaches the thermal runaway blocking threshold, the thermal fuse 4 melts, thereby cutting off the charging and discharging path of the battery cell.

[0061] Example 4: like Figure 7 As shown, in this embodiment, the battery cell 100 is a square soft-pack battery cell. Unlike embodiment 3, the second electrode lead-out conductor is a combination of a connecting piece and a middle tab. The second tab 104 and the first tab 103 with opposite polarity are respectively disposed on both sides of the battery cell (i.e., on the two end faces of the battery cell). The thermal fuse 200 is fixedly attached to the middle of the outer surface of the battery cell. The length of the middle tab is extended by the connecting piece, so that the thermal fuse 200 is disposed on the surface of the battery cell.

[0062] Because the distance between the thermal fuse 200 and the second tab 104 and the first tab 103 is relatively large in this application, connecting pieces 201 and 202 are provided. Connecting piece 201 is provided between the first end of the thermal fuse 200 and the intermediate tab 102; connecting piece 202 is provided between the second end of the thermal fuse 200 and the second tab 104.

[0063] Similar to Embodiment 3, the intermediate tab 102, which is welded to the temperature fuse 200, is a connecting electrode and is bent flat against the outer surface of the battery cell.

[0064] This battery can be composed of two or more cells 100 wound or folded together, or it can be formed by a single cell wound or folded together. There are many ways to combine the cells. In this embodiment, a method of combining battery cells is given. By optimizing the positions of the first tab 103, the middle tab 102, and the second tab 104 of the cell 100, the corresponding tabs of two cells 100 with thermal fuses can be attached one by one to form a parallel structure.

[0065] Typically, the cells 100 can be combined in an array or stack, and then connected in series and / or parallel via a bus to the first tab 103 and the second tab 104, and then encapsulated in a rigid casing to form a battery.

[0066] This battery may include multiple cells 100, which are formed by winding or folding. The multiple cells 100 are stacked and assembled with a casing to form a complete battery.

[0067] In this embodiment, the two battery cells 100 are provided with independent first tabs 103 and share a second tab 104. After the battery cells are stacked, the two first tabs 103 are attached together and electrically connected by laser welding, ultrasonic welding or other methods to form a single tab.

[0068] In this way, the thermal fuse 200 is clamped between the two battery cells 100. The thermal fuse 200 can receive the temperature of the two adjacent battery cells together, thus cutting off the circuit more promptly.

[0069] In other embodiments, unlike Embodiment 4, the battery can be formed by winding and folding a single cell. Specifically, the cell 100 has multiple winding units. The cell 100 is wound or folded, and adjacent winding units are stacked and assembled with a casing to form a complete battery. Each winding unit has a set of first tabs 103 and intermediate tabs 102. When two adjacent winding units are stacked, the opposing first tabs 103 overlap. The intermediate tabs 102 of two adjacent winding units are stacked and electrically connected to one end of a thermal fuse 200 through a connecting piece 201. The other end of the thermal fuse 200 is electrically connected to a second tab 104 through the connecting piece 202. The two adjacent winding units share the second tab 104. The end face of the thermal fuse of each winding unit contacts the cell surface of the two adjacent winding units. After all winding units are wound or folded, the first tabs 103 of all winding units perfectly overlap, and the second tabs 104 of all winding units perfectly overlap. The overlapped first tabs 103 and second tabs 104 are connected to the protection circuit. This setting allows the thermal fuse 200 to be placed inside the battery, enabling it to receive heat more quickly and cut off the circuit in time.

[0070] Of course, the cells of Examples 1-3 can also be stacked, connected in series and / or in parallel, and encapsulated in a rigid shell, and led out to form a battery, which is suitable for protection in different scenarios.

[0071] The batteries of this invention can be directly connected in series and / or parallel via busbars to form battery modules. This eliminates the need for external overcurrent protection devices such as thermal fuses, simplifies the number of solder joints during battery module assembly, and improves the reliability of the battery modules.

[0072] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A battery with an embedded thermal fuse, characterized in that, It includes a housing, and at least one battery cell and a thermal fuse disposed within the housing; The battery cell includes a first electrode, a second electrode, a first tab, and a second tab; The thermal fuse is disposed on the battery cell, with its first end electrically connected to the second electrode and its second end electrically connected to the second tab, thereby making the thermal fuse connected in series in the circuit path between the second electrode and the second tab, for use to melt and break when the internal temperature of the battery cell exceeds the set thermal runaway blocking threshold. The first tab and the second tab extend from the housing to form the positive and negative electrodes of the battery.

2. The battery with an embedded thermal fuse according to claim 1, characterized in that, The temperature fuse is embedded inside the battery cell.

3. The battery with an embedded thermal fuse according to claim 2, characterized in that, The battery cell is a wound lithium battery cell; it includes an electrode assembly formed by winding a first electrode, a second electrode, and a separator placed therebetween.

4. The battery with an embedded thermal fuse according to claim 1, characterized in that, The battery also includes a second electrode lead conductor for electrically connecting the second electrode to the temperature fuse; one end of the temperature fuse is electrically connected to the second electrode through the second electrode lead conductor, and its second end is electrically connected to the second electrode tab.

5. The battery with an embedded thermal fuse according to claim 4, characterized in that, The second electrode lead-out conductor is an independent connecting piece, one end of which is electrically connected to the second electrode, and the other end is electrically connected to the first end of the thermal fuse.

6. The battery with an embedded thermal fuse according to claim 5, characterized in that, There are multiple thermal fuses, and the two ends of the multiple thermal fuses are electrically connected to the contact plate and the second electrode tab, respectively, and are distributed inside the battery cell.

7. The battery with an embedded thermal fuse according to claim 3, characterized in that, The second electrode tab includes an internal section extending into the electrode assembly; the contact surface between the internal section and the second electrode is covered with an insulating layer.

8. The battery with an embedded thermal fuse according to claim 4, characterized in that, The temperature fuse is attached to the surface of the battery cell; The second electrode lead-out conductor is an intermediate electrode tab disposed on the battery cell; One end of the intermediate tab is connected to the second electrode, and the other end extends out of the battery cell and is electrically connected to the first end of the thermal fuse. The second electrode is electrically connected to the other end of the temperature fuse.

9. The battery with an embedded thermal fuse according to claim 8, characterized in that, The first tab, the second tab, and the thermal fuse are disposed on the same end face of the battery cell. The portion of the middle tab extending out of the battery cell is close to the surface of the battery cell and is electrically connected to one end of the thermal fuse. The other end of the thermal fuse is directly electrically connected to the second tab.

10. The battery with an embedded thermal fuse according to claim 8, characterized in that, The first tab and the second tab are respectively disposed on the two end faces of the battery cell, and the thermal fuse is disposed in the middle of the surface of the battery cell; the part of the middle tab that extends out of the battery cell is attached to the surface of the battery cell and then electrically connected to one end of the thermal fuse; the other end of the thermal fuse is electrically connected to the second tab.

11. The battery with an embedded thermal fuse according to claim 10, characterized in that, The battery includes multiple cells stacked together, with two adjacent cells forming a group. In a group, two cells share a second tab, and a thermal fuse corresponding to two cells is disposed between the two cells.

12. The battery with an embedded thermal fuse according to claim 8, characterized in that, The battery cell includes multiple winding units, each winding unit having a set of first tabs and intermediate tabs; after two adjacent winding units are stacked, the first tabs overlap; after the connecting pieces of two adjacent winding units are stacked, they are electrically connected to one end of the thermal fuse, and the other end of the thermal fuse is electrically connected to the second tab; the two adjacent winding units share the second tab; the end face of the thermal fuse contacts the surface of the battery cell of the two adjacent winding units respectively.

13. A battery module, characterized in that, The battery module is formed by connecting multiple batteries with embedded thermal fuses as described in any one of claims 1 to 12 in series and / or parallel.

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