Cylindrical battery

Abstract

The utility model provides a cylindrical battery which comprises a shell, a cover cap, a roll core and a temperature sensing line, and the roll core is contained in a space defined by the shell and the cover cap after being assembled; the shell comprises a first area, a middle area and a second area; when the shell and the cover cap are assembled, the first area is used for stretching into the sealing grinding tool, at least part of the first area is deformed and then connected with the cover cap in a matched mode, the second area is used for stretching into the locking tile to be fixed, and the middle area is exposed out of the sealing grinding tool and the locking tile and connected between the first area and the second area. A threading hole is formed in the middle area, and the temperature sensing line penetrates through the threading hole and then extends into a center hole of the roll core. According to the cylindrical battery, the threading hole is formed in the middle area of the shell, and the temperature sensing line penetrates through the threading hole and then extends into the center hole of the roll core, so that an external real-time monitoring device can accurately monitor the temperature in the roll core in real time through the temperature sensing line, and the safety performance of the cylindrical battery is improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and more particularly, to a cylindrical battery. Background Art

[0002] At present, during the cyclic charge and discharge of a cylindrical battery, the temperature inside the battery is relatively high. If the temperature inside the battery is too high, it is easy to accumulate heat and cause safety accidents. Therefore, the temperature detection inside the battery is crucial for improving the battery safety. Since the cylindrical battery has a fully enclosed structure, algorithms or simulation model prediction methods are mostly used to predict the temperature inside the battery, and there is often a large error between the predicted value and the actual value, so the temperature inside the battery cannot be accurately and real-time monitored. Summary of the Utility Model

[0003] The purpose of the embodiments of the present application is to provide a cylindrical battery to solve the technical problem that the temperature inside the battery cannot be accurately and real-time monitored in the related art.

[0004] The embodiments of the present application provide a cylindrical battery, including: a cylindrical battery, including a housing, a cap, a wound core and a temperature sensing wire. The wound core is accommodated in the space formed after the housing and the cap are assembled; the housing includes a first region, a middle region and a second region; when the housing and the cap are assembled, the first region is used to extend into the sealing mold, and at least part of the first region is deformed and cooperatively connected with the cap, the second region is used to extend into the lock washer and be fixed, the middle region is exposed outside the sealing mold and the lock washer and is connected between the first region and the second region; a wire passing hole is formed in the middle region, and the temperature sensing wire passes through the wire passing hole and then extends into the central hole of the wound core.

[0005] In one embodiment, the wire passing hole is arranged adjacent to the first region.

[0006] In one embodiment, the wire passing hole matches the temperature sensing wire.

[0007] In one embodiment, the shape of the wire passing hole is oval or square or hexagonal or circular.

[0008] In one embodiment, the temperature sensing wire extends along the gap between the wound core and the housing to one end of the wound core close to the cap, and extends into the central hole of the wound core after being bent.

[0009] In one embodiment, the cylindrical battery includes a current collecting plate, the current collecting plate is arranged between the cap and the wound core, and the temperature sensing wire penetrates through the current collecting plate from the side of the current collecting plate facing away from the wound core and then extends into the central hole of the wound core.

[0010] In one embodiment, the cylindrical battery includes a terminal, and one end of the temperature sensing wire outside the housing is connected to the terminal, and the terminal is used to connect to a real-time monitoring device.

[0011] In one embodiment, the cylindrical battery includes a sealing structure provided on the outer wall surface of the housing, and the sealing structure covers the wire passing hole and wraps the temperature sensing wire.

[0012] In one embodiment, the sealing structure includes epoxy resin sealant and a first raw tape. The first raw tape covers the wire passing hole and wraps the temperature sensing wire. The epoxy resin sealant completely covers the first raw tape and is connected to the outer wall surface of the housing, and the epoxy resin sealant wraps the temperature sensing wire.

[0013] In one embodiment, the housing is a steel shell; the sealing structure includes a solder layer and a second raw tape. The second raw tape covers the wire passing hole and wraps the temperature sensing wire. The solder layer completely covers the second raw tape and is connected to the outer wall surface of the housing, and the solder layer wraps the temperature sensing wire.

[0014] The beneficial effects of the cylindrical battery provided by the embodiments of the present application are as follows: By opening a wire passing hole in the middle area of the housing, the temperature sensing wire extends into the central hole of the core after passing through the wire passing hole, so that the external real-time monitoring device can monitor the temperature inside the core in real time and accurately through the temperature sensing wire. In this way, the defect that there is a large error between the predicted value and the actual value in the conventional prediction method can be overcome, so as to improve the safety performance of the cylindrical battery. In addition, by opening the wire passing hole in the middle area, when assembling the housing and the cap, the temperature sensing wire can effectively avoid the two assembling tools, namely the sealing die and the locking tile, and avoid the damage to the temperature sensing wire caused by the interference between the sealing die and the locking tile and the temperature sensing wire, so as to improve the safety performance of the cylindrical battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings.

[0016] Figure 1 It is a schematic diagram of the cooperation between the cylindrical battery provided by the embodiment of the present application, the sealing die, the locking tile and the real-time monitoring device;

[0017] Figure 2 is Figure 1 a schematic diagram of the structure of the housing and the cap of the cylindrical battery before assembly;

[0018] Figure 3 For Figure 2 Schematic diagram of the connection structure of the sealing structure, temperature-sensitive wire and housing in the cylindrical battery shown;

[0019] Among them, the reference numerals in the figure are as follows:

[0020] 10. Sealing die; 20. Locking tile; 30. Real-time monitoring device; 100. Cylindrical battery; 110. Housing; 111. First region; 112. Intermediate region; 113. Second region; 114. Threading hole; 120. Cap; 130. Winding core; 131. Central hole; 140. Temperature-sensitive wire; 150. Busbar plate; 160. Terminal; 170. Sealing structure; 171. Epoxy resin sealant; 172. First PTFE tape; 173. Solder layer; 174. Second PTFE tape; 180. Conductive handle. Detailed implementation manners

[0021] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0022] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0023] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0024] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality of" means two or more unless otherwise specifically defined.

[0025] Please refer to together Figures 1 to 3, the cylindrical battery 100 provided by the embodiments of the present application will be described hereinafter. The cylindrical battery 100 includes a housing 110, a cap 120, a wound core 130, and a temperature sensing wire 140. The wound core 130 is accommodated in the space formed after the housing 110 and the cap 120 are assembled. The housing 110 includes a first region 111, an intermediate region 112, and a second region 113. When the housing 110 and the cap 120 are assembled, the first region 111 is used to extend into the sealing mold 10, and at least a part of the first region 111 is deformed and cooperatively connected with the cap 120. When the housing 110 and the cap 120 are assembled, the second region 113 is used to extend into the locking piece 20 and is fixed therein. The intermediate region 112 is exposed outside the sealing mold 10 and the locking piece 20 and is connected between the first region 111 and the second region 113. A wire passing hole 114 is formed in the intermediate region 112. The temperature sensing wire 140 passes through the wire passing hole 114 and then extends into the central hole 131 of the wound core 130.

[0026] It can be understood that during the assembly process of the housing 110 and the cap 120, the sealing mold 10 and the locking piece 20 are used as assembly tools. For the locking piece 20, its interior is hollow to form a space for accommodating the second region 113 of the housing 110. After the second region 113 extends into the locking piece 20, it closely adheres to the inner wall surface of the locking piece 20. During the assembly process, the second region 113 is fixed and will not be deformed. For the sealing mold 10, it defines a space for accommodating the first region 111. When the first region 111 extends into the sealing mold 10, part or all of the first region 111 can be deformed under the action of the sealing mold 10, and the deformed first region 111 is cooperatively connected with the cap 120. Thus, it can be known that the intermediate region 112 located between the first region 111 and the second region 113 can be exposed outside the sealing mold 10 and the locking piece 20 during the assembly process of the housing 110 and the cap 120.

[0027] In the above-mentioned cylindrical battery 100, by forming the wire passing hole 114 in the intermediate region 112 of the housing 110, the temperature sensing wire 140 passes through the wire passing hole 114 and then extends into the central hole 131 of the wound core 130. Thus, the external real-time monitoring device 30 can accurately monitor the temperature inside the wound core 130 in real time through the temperature sensing wire 140, thereby overcoming the defect that there is a large error between the predicted value and the actual value in the conventional prediction method and improving the safety performance of the cylindrical battery 100. In addition, by forming the wire passing hole 114 in the intermediate region 112, when the housing 110 and the cap 120 are assembled, the temperature sensing wire 140 can effectively avoid the two assembly tools, i.e., the sealing mold 10 and the locking piece 20, and prevent the sealing mold 10 and the locking piece 20 from interfering with the temperature sensing wire 140 and causing damage to the temperature sensing wire 140, so as to improve the safety performance of the cylindrical battery 100.

[0028] Combined with Figures 1 to 3As shown, in some embodiments, the wire threading hole 114 is disposed adjacent to the first region 111. It can be understood that when the length of the temperature sensing wire 140 extending into the central hole 131 of the core 130 is fixed, the closer the wire threading hole 114 is to the first region 111, the shorter the length of the temperature sensing wire 140 in the space enclosed by the housing 110 and the cap 120 can be. This can not only make the temperature data monitoring more accurate, but also make the installation operation of the temperature sensing wire 140 in the space enclosed by the housing 110 and the cap 120 easier. In addition, when the second region 113 of the housing 110 is fixed by the locking tile 20, the wire threading hole 114 being disposed adjacent to the first region 111 is also more conducive to drilling.

[0029] Specifically in this application, the wire threading hole 114 is matched with the temperature sensing wire 140. It can be understood that the shape and the aperture size of the wire threading hole 114 are the same as the cross-sectional shape and the cross-sectional area size of the temperature sensing wire 140, so that the temperature sensing wire 140 can just pass through the wire threading hole 114, that is, the outer wall surface of the temperature sensing wire 140 is in close contact with the inner wall enclosing the wire threading hole 114. Thus, after the temperature sensing wire 140 passes through the wire threading hole 114, there is basically no gap between the temperature sensing wire 140 and the inner wall enclosing the wire threading hole 114, thereby reducing the sealing difficulty between the temperature sensing wire 140 and the inner wall enclosing the wire threading hole 114, contributing to improving the sealing performance of the cylindrical battery 100 to reduce the risk of the electrolyte in the core 130 leaking along the wire threading hole 114.

[0030] Specifically, the shape of the wire threading hole 114 is circular. In other embodiments, the shape of the wire threading hole 114 can also be oval or square or hexagonal. It only needs to ensure that the shape of the wire threading hole 114 is the same as the cross-sectional shape of the temperature sensing wire 140.

[0031] Combined with Figure 1 and Figure 2As shown, specifically in the present application, the temperature-sensitive wire 140 extends along the gap between the bobbin 130 and the housing 110 to one end of the bobbin 130 close to the cap 120, and after being bent, extends into the central hole 131 of the bobbin 130. It can be understood that for the temperature-sensitive wire 140 within the space enclosed by the housing 110 and the cap 120, it first extends along the gap between the bobbin 130 and the housing 110 from the wire-passing hole 114 to one end of the bobbin 130 close to the cap 120, and then the temperature-sensitive wire 140 is bent so that the temperature-sensitive wire 140 can smoothly extend into the central hole 131 of the bobbin 130. Such a setting can enable the temperature-sensitive wire 140 to extend into the central hole 131 for temperature monitoring without opening a hole in the bobbin 130. In addition, for the housing 110, its first region 111 and second region 113 respectively correspond to both ends of the cylindrical battery 100 in the axial direction, and in the axial direction of the cylindrical battery 100, the length of the first region 111 is less than the length of the second region 113. By making the temperature-sensitive wire 140 extend along the aforementioned path, the length of the temperature-sensitive wire 140 can be shortened, making the temperature data monitoring more accurate.

[0032] Specifically in the present application, the cylindrical battery 100 includes a current collector plate 150. The current collector plate 150 is disposed between the cap 120 and the bobbin 130. The temperature-sensitive wire 140 penetrates through the current collector plate 150 from the side of the current collector plate 150 facing away from the bobbin 130 and then extends into the central hole 131 of the bobbin 130. It can be understood that the current collector plate 150 is located between the cap 120 and the bobbin 130 and can achieve electrical connection between the cap 120 and the bobbin 130. By making the temperature-sensitive wire 140 penetrate through the current collector plate 150 after bypassing the current collector plate 150 and extending into the central hole 131 of the bobbin 130, it can ensure that the current collector plate 150 and the bobbin 130 achieve sufficient and large-area contact. Further, the cylindrical battery 100 includes a conductive stem 180, and the conductive stem 180 is electrically connected between the current collector plate 150 and the cap 120.

[0033] In the present application, the cylindrical battery 100 includes a terminal 160. One end of the temperature-sensitive wire 140 outside the housing 110 is connected to the terminal 160, and the terminal 160 is used to connect to the real-time monitoring device 30. The external real-time monitoring device 30 is electrically connected to the temperature-sensitive wire 140 through the terminal 160, and the temperature inside the bobbin 130 is monitored in real time and accurately through one end of the temperature-sensitive wire 140 extending into the central hole 131 of the bobbin 130. The setting of the terminal 160 can facilitate the quick connection between the temperature-sensitive wire 140 and the real-time monitoring device 30.

[0034] Combined with Figure 2 and Figure 3As shown, in an embodiment of the present application, the cylindrical battery 100 includes a sealing structure 170 provided on the outer wall surface of the housing 110. The sealing structure 170 covers the wire passing hole 114 and wraps the temperature sensing wire 140. By providing the sealing structure 170, the connection between the temperature sensing wire 140 and the middle region 112 can be sealed, thereby improving the sealing performance of the cylindrical battery 100 and reducing the risk of electrolyte leakage from the wound core 130 along the wire passing hole 114. Further, the operator can set the sealing structure 170 on the outer wall surface of the housing 110 from the outside of the housing 110, and the sealing operation is relatively convenient.

[0035] Specifically, in the present application, the sealing structure 170 includes epoxy resin sealant 171 and the first PTFE tape 172. The first PTFE tape 172 covers the wire passing hole 114 and wraps the temperature sensing wire 140. The epoxy resin sealant 171 completely covers the first PTFE tape 172 and is connected to the outer wall surface of the housing 110, and the epoxy resin sealant 171 wraps the temperature sensing wire 140. It can be understood that the first PTFE tape 172 is specifically a solid PTFE tape. When sealing, the first PTFE tape 172 can be wound around the temperature sensing wire 140 until the first PTFE tape 172 completely covers the wire passing hole 114 and the first PTFE tape 172 is close to the outer wall surface of the housing 110. Then, the epoxy resin sealant 171 is coated in a large area around the temperature sensing wire 140, on the surface of the first PTFE tape 172 and outside the first PTFE tape 172. After the epoxy resin sealant 171 is cured, a cured structure layer is formed that wraps the temperature sensing wire 140, completely covers the first PTFE tape 172, and is also connected to the outer wall surface of the housing 110 outside the first PTFE tape 172. In this way, the first PTFE tape 172 and the coated epoxy resin sealant 171 can cooperate together to achieve double-layer sealing at the wire passing hole 114, and the sealing effect is better, so as to improve the sealing performance of the cylindrical battery 100, and the sealing operation is relatively simple.

[0036] Specifically, in the present application, the housing 110 is a steel shell, which can endow the cylindrical battery 100 with better structural strength, impact resistance and durability. When the housing 110 is a steel shell, in another embodiment, the sealing structure 170 may include a solder layer 173 and a second raw tape 174. The second raw tape 174 covers the wire passing hole 114 and wraps the temperature sensing wire 140. The solder layer 173 completely covers the second raw tape 174 and is connected to the outer wall surface of the housing 110, and the solder layer 173 wraps the temperature sensing wire 140. It can be understood that the second raw tape 174 can be a liquid raw tape. When performing sealing, the second raw tape 174 can be first coated around the temperature sensing wire 140 to the periphery of the wire passing hole 114. After curing, the second raw tape 174 wraps the temperature sensing wire 140, covers the wire passing hole 114 and closely adheres to the outer wall surface of the housing 110. Then, a solder layer 173 is formed by metal welding in a large area around the temperature sensing wire 140, on the surface of the second raw tape 174 and outside the second raw tape 174. The solder layer 173 wraps the temperature sensing wire 140, completely covers the second raw tape 174, and is also stably connected to the outer wall surface of the housing 110 outside the second raw tape 174. In this way, the second raw tape 174 and the solder layer 173 cooperate to achieve double-layer sealing at the wire passing hole 114, with a better sealing effect, so as to improve the sealing performance of the cylindrical battery 100, and the sealing operation is relatively simple.

[0037] The foregoing are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A cylindrical battery, characterized in that: It includes a shell, a cap, a winding core and a temperature sensing line, wherein the winding core is accommodated in a space enclosed by the shell and the cap after being assembled; the shell includes a first area, a middle area and a second area; when the shell and the cap are assembled, the first area is used to extend into the interior of the sealing mold, and at least a portion of the first area is deformed and connected with the cap, the second area is used to extend into the interior of the locking tile and be fixed, the middle area is exposed to the sealing mold and the locking tile, and is connected between the first area and the second area; a threading hole is opened in the middle area, and the temperature sensing line extends to the center hole of the winding core after passing through the threading hole.

2. The cylindrical battery according to claim 1, characterized in that: The threading hole is arranged adjacent to the first area.

3. The cylindrical battery according to claim 1, characterized in that: The threading hole matches the temperature sensing wire.

4. The cylindrical battery according to claim 3, characterized in that: The threading hole is in the shape of an ellipse, a square, a hexagon or a circle.

5. The cylindrical battery according to claim 1, characterized in that: The temperature sensing line extends along the gap between the winding core and the shell to an end of the winding core close to the cover cap, and extends to the inside of the central hole of the winding core after being bent.

6. The cylindrical battery according to claim 5, characterized in that: The cylindrical battery includes a busbar, which is disposed between the cap and the winding core. The temperature sensing line extends from the side of the busbar away from the winding core through the busbar to the center hole of the winding core.

7. The cylindrical battery according to claim 1, characterized in that: The cylindrical battery comprises a connection terminal, one end of the temperature sensing wire externally disposed on the shell is connected to the connection terminal, and the connection terminal is used to connect to a real-time monitoring device.

8. The cylindrical battery according to any one of claims 1 to 7, characterized in that: The cylindrical battery comprises a sealing structure arranged on the outer wall surface of the shell, and the sealing structure covers the threading hole and wraps the temperature sensing wire.

9. The cylindrical battery according to claim 8, characterized in that: The sealing structure includes epoxy resin sealant and a first raw tape, the first raw tape covers the threading hole and wraps the temperature sensing wire, the epoxy resin sealant completely covers the first raw tape and is connected to the outer wall of the shell, and the epoxy resin sealant wraps the temperature sensing wire.

10. The cylindrical battery according to claim 8, characterized in that: The shell is a steel shell; the sealing structure includes a solder layer and a second raw tape, the second raw tape covers the threading hole and wraps the temperature sensing wire, the solder layer completely covers the second raw tape and is connected to the outer wall of the shell, and the solder layer wraps the temperature sensing wire.

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