Cylindrical battery

Abstract

The utility model discloses a cylindrical battery. The cylindrical battery comprises a shell; the battery cell body is arranged in the shell; the positive electrode cap is buckled at the end part of the shell and is connected with the shell, the positive electrode cap comprises a positive electrode conductive body and a first insulating body, and a pressure relief part is arranged on the first insulating body; the current collecting plate is arranged between the battery cell body and the positive electrode cap, the current collecting plate comprises a first conductive body, and the two ends of the first conductive body are connected with the battery cell body and the positive electrode conductive body respectively. The problems that in the prior art, an anti-explosion valve in a cylindrical battery is externally arranged, the installation space is occupied, and the number of parts of the cylindrical battery is large are solved.

Description

Technical Field

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

[0002] At present, there are mainly two types of electrical connection structures for the rolled core pole pieces of full-pole lug cylindrical batteries. One is that a daisy-shaped collector plate is welded on the bent pole piece, and the other is that the pole piece foil is flattened, and then the collector plate and the flattened pole piece are laser welded.

[0003] However, the welding yield of the above two connection methods is low. Taking the flattening method as an example, during the flattening process, metal debris will detach, which may easily cause a short circuit inside the winding core. After the electrode is flattened, the electrolyte flow channel becomes narrower, which is not conducive to the infiltration of the electrolyte, resulting in a long infiltration time, which has an adverse effect on the safety and working efficiency of the battery. In addition, most of the existing batteries have an explosion-proof valve installed separately on the positive electrode column, and the number of parts is large, which increases the overall volume of the battery and occupies the installation space. Utility Model Content

[0004] The main purpose of the present application is to provide a cylindrical battery to solve the problems in the prior art that the explosion-proof valve of the cylindrical battery is externally installed and occupies installation space, and the battery has a large number of parts.

[0005] The present application provides a cylindrical battery, comprising: a shell; a battery cell body, arranged in the shell; a positive electrode cap, buckled on the end of the shell and connected to the shell, the positive electrode cap comprising a positive electrode conductive body and a first insulating body, and a pressure relief portion is arranged on the first insulating body; a current collecting plate, arranged between the battery cell body and the positive electrode cap, the current collecting plate comprising a first conductive body, and two ends of the first conductive body are respectively connected to the battery cell body and the positive electrode conductive body.

[0006] Furthermore, the positive electrode conductive body includes: a second conductive body and a connecting piece, the second conductive body is connected to the first conductive body, the connecting piece is connected to the shell, and at least a portion of the first insulating body is arranged between the second conductive body and the connecting piece.

[0007] Furthermore, the first insulating body is an annular structure, and along the radial direction of the first insulating body, the first insulating body has a first wall and a second wall that are oppositely arranged, a first slot is arranged on the first wall, and a second slot is arranged on the second wall; at least a portion of the second conductive body is inserted in the first slot, and at least a portion of the connector is inserted in the second slot, and a middle portion of the second conductive body protrudes relative to the first insulating body in a direction away from the battery cell body; wherein the first insulating body, the second conductive body and the connector are an integrally formed structure.

[0008] Furthermore, the pressure relief part includes: a pressure relief channel, the pressure relief channel extends along the axial direction of the first insulating body, a blocking body is arranged on the channel wall of the pressure relief channel, and the blocking body extends from the channel wall of the pressure relief channel toward the middle of the pressure relief channel; wherein, there are multiple pressure relief channels, and the multiple pressure relief channels are arranged at intervals along the circumferential direction of the first insulating body.

[0009] Furthermore, the cylindrical battery further comprises: a protective sheet, which is arranged on the first insulating body, and the protective sheet cover is arranged on the pressure relief part.

[0010] Furthermore, the current collecting plate also includes: a second insulating body, which is arranged between the positive electrode cap and the battery cell body, and at least part of the side wall surface of the second insulating body is in contact with the inner wall surface of the shell; wherein one end of the first conductive body is connected to the battery cell body, and the other end of the first conductive body passes through the second insulating body and is connected to the positive conductive body.

[0011] Furthermore, the second insulating body includes a first mounting surface and a second mounting surface that are relatively arranged; the collecting plate also includes: a first baffle, which is arranged on the first mounting surface, and the first baffle extends along the circumferential direction of the second insulating body to enclose a first mounting cavity, and at least a portion of the battery cell body is located in the first mounting cavity; a second baffle, which is arranged on the second mounting surface, and the second baffle extends along the circumferential direction of the second insulating body to enclose a second mounting cavity, the pressure relief portion is connected to the second mounting cavity, and at least a portion of the second baffle is in contact with the inner wall surface.

[0012] Furthermore, a liquid inlet channel is provided on the battery cell body, and the current collecting plate also includes: a flow hole, which is provided on the second insulating body, and the flow hole is opposite to and connected with the liquid inlet channel; wherein the second mounting surface is inclined from the edge of the second insulating body toward the flow hole.

[0013] Furthermore, the first conductive body includes: a first connecting body, a bending body and a second connecting body connected in sequence, one end of the first connecting body is electrically connected to the battery cell body, and the other end passes through the second insulating body and is connected to the bending body; the bending body is located in the second mounting cavity and is spaced apart from the second mounting surface; one end of the second connecting body is connected to the bending body, and the other end is connected to the positive electrode cap.

[0014] Furthermore, the cylindrical battery also includes: a conductive adhesive layer, which is arranged between the battery body and the current collecting plate, and the conductive adhesive layer is respectively bonded to the battery body and the first conductive body; an avoidance channel is arranged on the conductive adhesive layer, and the avoidance channel is respectively opposite to the liquid inlet channel and the flow hole.

[0015] Furthermore, a connecting section is provided at the end of the shell, and the connecting section includes a third connecting body and a fourth connecting body which are connected to each other; one end of the third connecting body is connected to the end of the shell, and the other end of the third connecting body extends toward the center line direction of the shell, and one end of the fourth connecting body is connected to an end of the third connecting body away from the shell, and the other end of the fourth connecting body extends along the axial direction of the shell; wherein, at least a portion of the positive electrode cap is buckled on the fourth connecting body and connected to the fourth connecting body.

[0016] Furthermore, the cylindrical battery also includes a conductive adhesive layer, which is respectively connected to the first conductive body and the battery cell body; the battery cell body includes a plurality of pole pieces, and a diaphragm is arranged between two adjacent pole pieces; wherein each pole piece includes: a first pole piece body and a second pole piece body, the second pole piece body is arranged at the end of the first pole piece body, and the second pole piece body extends from the first pole piece body along the width direction of the first pole piece body; the first pole piece body is bonded to the diaphragm, the second pole piece body is connected to the conductive adhesive layer, and the width of the second pole piece body is B, 0.3mm≤B≤3.5mm.

[0017] Compared with the prior art, the technical solution of this application has at least the following technical effects:

[0018] In the cylindrical battery provided by the present application, the positive electrode cap includes a positive electrode conductive body and a first insulating body, a pressure relief portion is provided on the first insulating body, and the pressure relief portion is arranged opposite to the battery body; the current collecting plate is arranged between the battery body and the positive electrode cap, and the current collecting plate includes a first conductive body, and the two ends of the first conductive body are respectively connected to the battery body and the positive electrode conductive body. By arranging the pressure relief portion on the first insulating body, the pressure relief portion and the positive electrode cap are designed as an integral structure, and there is no need to separately install an explosion-proof structure on the battery body. The positive electrode cap has its own explosion-proof effect, which reduces the number of battery parts while ensuring the safety of the battery, simplifies the structure of the battery, and can achieve small cylindrical packaging, saving installation space. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0020] Figure 1 This is an exploded view of the structure of the cylindrical battery disclosed in this application;

[0021] Figure 2 This is a schematic diagram of the structure of the cylindrical battery disclosed in this application;

[0022] Figure 3 A cross-sectional view of a cylindrical battery disclosed in the present application from a first viewing angle;

[0023] Figure 4 A cross-sectional view of a cylindrical battery disclosed in the present application from a second viewing angle;

[0024] Figure 5 This is an exploded view of the structure of the positive electrode cap in the cylindrical battery disclosed in this application;

[0025] Figure 6 A cross-sectional view of a positive electrode cap in a cylindrical battery disclosed in the present application;

[0026] Figure 7 This is a schematic structural diagram of the first insulating body in the cylindrical battery disclosed in this application;

[0027] Figure 8 This is a schematic diagram of the structure of the current collecting plate in the cylindrical battery disclosed in this application;

[0028] Fig. 9 A cross-sectional view of a current collecting plate in a cylindrical battery disclosed in the present application;

[0029] Fig.10 A structural cross-sectional view of a second insulating body in a cylindrical battery disclosed in the present application;

[0030] Fig.11 This is a schematic diagram of the structure of the battery cell body in the cylindrical battery disclosed in this application;

[0031] Fig.12 A structural cross-sectional view of a cell body in a cylindrical battery disclosed in the present application from a first perspective;

[0032] Fig.13 This is a structural cross-sectional view of the battery cell body in the cylindrical battery disclosed in this application from a second perspective.

[0033] The above drawings include the following reference numerals:

[0034] 1. Shell; 10. Inner wall surface; 11. Connecting section; 110. Third connecting body; 111. Fourth connecting body; 2. Cell body; 20. Liquid inlet channel; 21. Pole piece; 22. Diaphragm; 210. First pole piece body; 211. Second pole piece body;

[0035] 3. positive electrode cap; 30. positive electrode conductive body; 330. pressure relief part; 31. second conductive body; 32. connecting piece;

[0036] 33, first insulating body; 331, first wall; 332, second wall; 3310, first slot; 3320, second slot; 333, pressure relief channel; 3330, channel wall; 3331, blocking body;

[0037] 4. Current collecting plate; 40. First conductive body; 401. First connecting body; 402. Bending body; 403. Second connecting body; 41. Second insulating body; 410. Side wall surface; 411. First mounting surface; 412. Second mounting surface; 42. First baffle plate; 43. First mounting cavity; 44. Second baffle plate; 45. Second mounting cavity; 46. Flow hole; 5. Protective sheet; 6. Conductive adhesive layer; 60. Avoidance channel; 61. Positive conductive adhesive layer; 62. Negative conductive adhesive layer. DETAILED DESCRIPTION

[0038] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0039] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0040] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0041] As mentioned in the background technology, most of the existing cylindrical batteries have an explosion-proof valve installed separately on the positive electrode column to achieve battery cell pressure relief. The method of installing the explosion-proof valve separately not only increases the number of battery parts, but also increases the weight and volume of the battery, which is not conducive to the lightweight design of the battery. Therefore, the present application provides a cylindrical battery, comprising a shell 1, a battery cell body 2, a positive electrode cap 3 and a current collecting plate 4, wherein the positive electrode cap 3 is buckled on the end of the shell 1 and connected to the shell 1, and the positive electrode cap 3 comprises a positive electrode conductive body 30 and a first insulating body 33, wherein a pressure relief portion 330 is arranged on the first insulating body 33, and the pressure relief portion 330 is opposite to the battery cell body 2, and when the temperature of the battery cell body 2 rises too fast and causes the air pressure to increase, the pressure relief portion 330 is utilized to release the air pressure, which plays an explosion-proof role, thereby ensuring the safety of the battery; in addition, the positive electrode conductive body 30 is used to conduct current, and the current collecting plate 4 comprises a first conductive body 40, and the two ends of the first conductive body 40 are respectively connected to the battery cell body 2 and the positive electrode conductive body 30, thereby realizing the electrical connection between the positive electrode cap 3 and the battery cell body 2. In the present application, the positive electrode cap 3 is combined with the pressure relief portion 330 by setting the pressure relief portion 330 on the first insulating body 33 of the positive electrode cap 3. In the process of manufacturing the positive electrode cap 3, the pressure relief portion 330 is formed simultaneously. There is no need to separately install pressure relief parts such as explosion-proof valves. While ensuring the safety of the battery, the volume of the cylindrical battery is reduced and the installation space is saved.

[0042] See also Figures 1 to 12 As shown, the present application provides a cylindrical battery, comprising: a shell 1; a battery cell body 2, arranged in the shell 1; a positive cap 3, buckled on the end of the shell 1 and connected to the shell 1, the positive cap 3 comprising a positive conductive body 30 and a first insulating body 33, and a pressure relief portion 330 is provided on the first insulating body 33; a current collecting plate 4, arranged between the battery cell body 2 and the positive cap 3, the current collecting plate 4 comprising a first conductive body 40, and two ends of the first conductive body 40 are respectively connected to the battery cell body 2 and the positive conductive body 30.

[0043] According to the cylindrical battery provided in the present application, it includes a shell 1, a battery body 2, a positive cap 3 and a current collecting plate 4. The battery body 2 is arranged in the shell 1, the positive cap 3 is buckled at the end of the shell 1 and connected to the shell 1, the positive cap 3 includes a positive conductive body 30 and a first insulating body 33, and a pressure relief portion 330 is arranged on the first insulating body 33, and the pressure relief portion 330 is arranged opposite to the battery body 2; the current collecting plate 4 is arranged between the battery body 2 and the positive cap 3, and the current collecting plate 4 includes a first conductive body 40, and the two ends of the first conductive body 40 are respectively connected to the battery body 2 and the positive conductive body 30. By arranging the pressure relief portion 330 on the first insulating body 33, the pressure relief portion 330 and the positive cap 3 are designed as an integral structure, and there is no need to separately install an explosion-proof structure on the battery body 2. The positive cap 3 has its own explosion-proof effect, which reduces the number of battery parts while ensuring the safety of the battery, simplifies the structure of the battery, and saves installation space.

[0044] Specifically, the positive electrode conductive body 30 includes: a second conductive body 31 and a connector 32, the second conductive body 31 is connected to the first conductive body 40, the connector 32 is connected to the housing 1, and at least part of the first insulating body 33 is disposed between the second conductive body 31 and the connector 32. In actual application, the housing 1 of the cylindrical battery carries negative electricity, and after the connector 32 is connected to the housing 1, the first insulating body 33 is used to insulate the second conductive body 31 to avoid a short circuit inside the battery.

[0045] In the specific implementation process, Figures 5 to 7 As shown, the first insulating body 33 is an annular structure. Along the radial direction of the first insulating body 33, the first insulating body 33 has a first wall 331 and a second wall 332 arranged opposite to each other. The first wall 331 is provided with a first slot 3310, and the second wall 332 is provided with a second slot 3320. At least part of the second conductive body 31 is inserted into the first slot 3310, and at least part of the connector 32 is inserted into the second slot 3320. The middle part of the second conductive body 31 protrudes in a direction away from the battery body 2 relative to the first insulating body 33. The first insulating body 33, the second conductive body 31 and the connector 32 are an integrally formed structure. The positive cap 3 is designed in an integrated manner, and the second conductive body 31 and the connector 32 are respectively embedded in the first insulating body 33, so that the second conductive body 31 and the connector 32 are insulated, and the upper surface of the positive cap 3 is of the same polarity (i.e., the surface of the second conductive body 31), thereby improving safety. Preferably, the first insulating body 33, the second conductive body 31 and the connecting member 32 are formed into an integral structure by injection molding or hot-melt process.

[0046] Specifically, the pressure relief part 330 includes: a pressure relief channel 333, the pressure relief channel 333 extends along the axial direction of the first insulating body 33, and a blocking body 3331 is arranged on the channel wall 3330 of the pressure relief channel 333, and the blocking body 3331 extends from the channel wall 3330 of the pressure relief channel 333 toward the middle direction of the pressure relief channel 333; wherein, there are multiple pressure relief channels 333, and the multiple pressure relief channels 333 are arranged at intervals along the circumferential direction of the first insulating body 33. The cylindrical battery also includes: a protective sheet 5, which is arranged on the first insulating body 33, and the protective sheet 5 is covered on the pressure relief part 330. By setting the blocking body 3331, compared with the pressure relief channel 333, the cross-sectional area of ​​the flow section of the airflow is reduced, so that the airflow can break through the protective sheet 5. When the internal part of the battery cell is out of control, the internal energy will break through the weak area to release the energy, thereby achieving the purpose of pressure relief, so as to ensure the safety of the battery.

[0047] In the embodiments provided in this application, Figures 8 to 10 As shown, the current collecting plate 4 also includes: a second insulating body 41, which is arranged between the positive electrode cap 3 and the battery body 2, and at least part of the side wall surface 410 of the second insulating body 41 is in contact with the inner wall surface 10 of the shell 1; wherein one end of the first conductive body 40 is connected to the battery body 2, and the other end of the first conductive body 40 passes through the second insulating body 41 and is connected to the positive conductive body 30. Since the battery shell 1 carries negative electricity, in order to ensure the safety of the circuit, the side wall surface of the second insulating body 41 is in contact with the inner wall surface of the shell 1, and the first conductive body 40 is passed through the second insulating body 41. The first conductive body 40 is insulated from the shell 1, and is electrically connected to the second conductive body 31 in the positive conductive body 30 and the battery body 2 respectively.

[0048] Furthermore, the second insulating body 41 includes a first mounting surface 411 and a second mounting surface 412 that are relatively arranged; the collecting plate 4 also includes: a first baffle 42, which is arranged on the first mounting surface 411, and the first baffle 42 extends along the circumferential direction of the second insulating body 41 to enclose a first mounting cavity 43, and at least a portion of the battery cell body 2 is located in the first mounting cavity 43; a second baffle 44, which is arranged on the second mounting surface 412, and the second baffle 44 extends along the circumferential direction of the second insulating body 41 to enclose a second mounting cavity 45, the pressure relief portion 330 is connected to the second mounting cavity 45, and at least a portion of the second baffle 44 is in contact with the inner wall surface 10. A first mounting cavity 43 is formed by setting a first baffle plate 42, and at least a portion of the battery cell body 2 is located in the first mounting cavity 43, thereby protecting the end of the battery cell body 2. A second mounting cavity 45 is formed by setting a second baffle plate 44, so that air flows through the second mounting cavity 45 and out of the pressure relief portion 330. At the same time, the electrolyte is introduced into the battery cell body 2 through the second mounting cavity 45.

[0049] Specifically, the cell body 2 is provided with a liquid inlet channel 20, and the current collecting plate 4 further includes: a flow hole 46, which is provided on the second insulating body 41, and the flow hole 46 is opposite to and communicates with the liquid inlet channel 20; wherein the second mounting surface 412 is inclined from the edge of the second insulating body 41 toward the flow hole 46. By setting the second mounting surface 412 as an inclined surface, the electrolyte in the second mounting cavity 45 flows toward the flow hole 46, and the static cell body 2 can not only realize the electrolyte slowly infiltrating into the winding core, reducing the injection time, but also store a certain amount of electrolyte.

[0050] In a specific implementation, the first conductive body 40 includes: a first connecting body 401, a bending body 402, and a second connecting body 403 connected in sequence, one end of the first connecting body 401 is electrically connected to the battery cell body 2, and the other end is connected to the bending body 402 after passing through the second insulating body 41; the bending body 402 is located in the second mounting cavity 45 and is spaced apart from the second mounting surface 412; one end of the second connecting body 403 is connected to the bending body 402, and the other end is connected to the positive cap 3. By including the first conductive body 40 as the bending body 402, after the first conductive body 40 passes through the second insulating body 41, the bending body 402 is used to keep the first conductive body 40 and the second mounting surface 412 spaced apart, so that the second connecting body 403 is conveniently connected to the second conductive body 31 in the positive cap 3. Preferably, the first conductive body 40 and the second insulating body 41 are an integrally formed structure, which is formed by injection molding. Alternatively, they are assembled together by assembly.

[0051] In the present application, the cylindrical battery further includes: a conductive adhesive layer 6, which is arranged between the battery body 2 and the current collecting plate 4, and the conductive adhesive layer 6 is respectively bonded to the battery body 2 and the first conductive body 40; an avoidance channel 60 is arranged on the conductive adhesive layer 6, and the avoidance channel 60 is respectively opposite to the liquid inlet channel 20 and the flow hole 46. Specifically, the conductive adhesive layer 6 includes a positive electrode conductive adhesive layer 61 and a negative electrode conductive adhesive layer 62, the positive electrode conductive adhesive layer 61 is connected to the positive electrode sheet of the battery body 2, the first conductive body 40 is connected to the positive electrode conductive adhesive layer 61, and the negative electrode conductive adhesive layer 62 is arranged at the bottom of the shell 1 and connected to the negative electrode sheet of the battery body 2.

[0052] Conductive glue is composed of resin glue + metal powder + other materials. The resin material is usually polyurethane, epoxy resin, silicone and other materials. The metal powder is usually copper powder, silver powder, copper-silver powder, nickel powder and other materials. The specific conductivity of the glue depends on the ratio of different materials. Its volume resistivity is 1×10 -3 Ω.cm~1×10 -6 Ω.cm, the bonding strength is between 1Mpa and 15Mpa, the glue has good temperature stability, the conductive glue is initially in a paste state, and will change into a solid state over time, with good adhesion and conductivity.

[0053] In the actual production process, the end of the shell 1 is provided with a connecting section 11, and the connecting section 11 includes a third connecting body 110 and a fourth connecting body 111 connected to each other; one end of the third connecting body 110 is connected to the end of the shell 1, and the other end of the third connecting body 110 extends toward the center line direction of the shell 1, and one end of the fourth connecting body 111 is connected to the end of the third connecting body 110 away from the shell 1, and the other end of the fourth connecting body 111 extends along the axis direction of the shell 1; wherein, at least part of the positive electrode cap 3 is buckled on the fourth connecting body 111 and connected to the fourth connecting body 111. Such a setting forms a shrinkage structure at the end of the shell 1, and the positive electrode cap 3 is installed in the shrinkage position, that is, the connector 32 of the positive electrode cap 3 is connected to the fourth connecting body 111. After the assembly is completed, the contact part of the connector 32 and the fourth connecting body 111 is laser welded to achieve the effect of sealing the battery cell. Compared with the traditional sealing ring solution, the waterproof and gas-proof effect is better, and the battery cell body 2 can adapt to a more severe working environment.

[0054] Furthermore, the cylindrical battery also includes a conductive adhesive layer 6, which is respectively connected to the first conductive body 40 and the battery cell body 2; the battery cell body 2 includes a plurality of pole pieces 21, and a diaphragm 22 is arranged between two adjacent pole pieces 21; wherein each pole piece 21 includes: a first pole piece body 210 and a second pole piece body 211, the second pole piece body 211 is arranged at the end of the first pole piece body 210, and the second pole piece body 211 extends from the first pole piece body 210 along the width direction of the first pole piece body 210; the first pole piece body 210 is bonded to the diaphragm 22, the second pole piece body 211 is connected to the conductive adhesive layer 6, and the width of the second pole piece body 211 is B, 0.3mm≤B≤3.5mm. In the actual production process, the first pole piece body 210 is coated with an active material coating, which is bonded to the diaphragm 22 for electrolytic reaction. The second pole piece body 211 is a non-coated area, which is bonded to the conductive adhesive layer 6. After winding multiple pole pieces 21 and multiple diaphragms 22, the positive and negative pole pieces will form a gap area due to the second pole piece body 211, that is, the liquid inlet channel 20. The liquid inlet channel 20 allows the electrolyte to enter the winding core better. In addition, the conductive adhesive layer 6 is connected to the second pole piece body 211, and there is no need to bend or flatten the second pole piece body 211, which effectively prevents the risk of metal debris escaping and prevents short circuits inside the battery cell.

[0055] In the present application, the positive and negative electrode sheet circuits of the core of the battery cell body 2 are connected to the metal shell (shell 1) and the positive current collector through conductive glue. The conductive glue has good conductivity and bonding strength. For example, the circuit of the negative electrode sheet is connected: the conductive glue can be injected into the bottom of the inner cavity of the metal shell, and then the core is installed into the metal shell (the liquid guide groove of the core avoids the conductive glue), the negative electrode sheet empty foil of the core is in contact with the bottom of the steel shell, and the conductive glue fully contacts the negative electrode sheet and the metal shell. After the conductive glue is cured, a good circuit path is formed, and the negative electrode sheet is fixed to the bottom of the metal shell. Preferably, the metal shell (shell 1) is usually a steel shell or an aluminum shell; the battery cell body 2 is wrapped with a heat shrink film layer to provide secondary insulation protection for the battery cell.

[0056] Compared with the laser welding method of the pole piece of the full-pole ear cylindrical battery cell, the cylindrical battery of the present application adopts a non-welding solution for the circuit connection between the wound core pole piece and the positive and negative poles, and uses conductive glue to connect the positive and negative circuits and fix the pole piece to the pole current disk or metal shell, thereby improving the process yield; a dedicated electrolyte immersion channel (liquid inlet channel 20) and a liquid collecting tank (second installation cavity 45) are reserved to solve the problem of slow electrolyte infiltration or poor immersion, and a current collecting disk design is adopted to reduce the number of parts and reduce the cost; the hollow foil pole piece (second pole piece body 211) does not need to be bent or flattened, which can effectively prevent the risk of metal debris detaching and prevent internal short circuit of the battery cell; the positive cap adopts an integrated design, and the upper surface of the positive cap is all of the same polarity, thereby improving safety; and small cylindrical packaging can be achieved.

[0057] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0058] According to the cylindrical battery provided in the present application, it includes a shell 1, a battery body 2, a positive cap 3 and a current collecting plate 4. The battery body 2 is arranged in the shell 1, the positive cap 3 is buckled at the end of the shell 1 and connected to the shell 1, the positive cap 3 includes a positive conductive body 30 and a first insulating body 33, and a pressure relief portion 330 is arranged on the first insulating body 33, and the pressure relief portion 330 is arranged opposite to the battery body 2; the current collecting plate 4 is arranged between the battery body 2 and the positive cap 3, and the current collecting plate 4 includes a first conductive body 40, and the two ends of the first conductive body 40 are respectively connected to the battery body 2 and the positive conductive body 30. By arranging the pressure relief portion 330 on the first insulating body 33, the pressure relief portion 330 and the positive cap 3 are designed as an integral structure, and there is no need to separately install an explosion-proof structure on the battery body 2. The positive cap 3 has its own explosion-proof effect, which reduces the number of battery parts while ensuring the safety of the battery, simplifies the structure of the battery, and saves installation space.

[0059] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0060] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0061] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A cylindrical battery, characterized in that: include: Housing (1); A battery cell body (2) is arranged inside the housing (1); a positive electrode cap (3) buckled on an end of the shell (1) and connected to the shell (1), the positive electrode cap (3) comprising a positive electrode conductive body (30) and a first insulating body (33), the first insulating body (33) being provided with a pressure relief portion (330); A current collecting plate (4) is arranged between the battery cell body (2) and the positive electrode cap (3), and the current collecting plate (4) comprises a first conductive body (40), and two ends of the first conductive body (40) are respectively connected to the battery cell body (2) and the positive electrode conductive body (30).

2. The cylindrical battery according to claim 1, characterized in that: The positive electrode conductive body (30) comprises: A second conductive body (31) and a connecting piece (32), wherein the second conductive body (31) is connected to the first conductive body (40), the connecting piece (32) is connected to the shell (1), and at least a portion of the first insulating body (33) is arranged between the second conductive body (31) and the connecting piece (32).

3. The cylindrical battery according to claim 2, characterized in that: The first insulating body (33) is an annular structure, and along the radial direction of the first insulating body (33), the first insulating body (33) has a first wall surface (331) and a second wall surface (332) arranged opposite to each other, the first wall surface (331) is provided with a first slot (3310), and the second wall surface (332) is provided with a second slot (3320); At least a portion of the second conductive body (31) is inserted into the first slot (3310), at least a portion of the connecting member (32) is inserted into the second slot (3320), and a middle portion of the second conductive body (31) protrudes relative to the first insulating body (33) in a direction away from the battery cell body (2); Wherein, the first insulating body (33), the second conductive body (31) and the connecting member (32) are an integrally formed structure.

4. The cylindrical battery according to claim 1, characterized in that: The pressure relief portion (330) comprises: a pressure relief channel (333), the pressure relief channel (333) extending along the axial direction of the first insulating body (33), a blocking body (3331) being arranged on a channel wall surface (3330) of the pressure relief channel (333), the blocking body (3331) extending from the channel wall surface (3330) of the pressure relief channel (333) toward the middle of the pressure relief channel (333); There are a plurality of pressure relief channels (333), and the plurality of pressure relief channels (333) are arranged at intervals along the circumferential direction of the first insulating body (33).

5. The cylindrical battery according to claim 1, characterized in that: The cylindrical battery also includes: A protective sheet (5) is arranged on the first insulating body (33), and the protective sheet (5) is covered on the pressure relief portion (330).

6. The cylindrical battery according to claim 1, characterized in that: The collecting plate (4) further comprises: A second insulating body (41) is arranged between the positive electrode cap (3) and the cell body (2), and at least a portion of a side wall surface (410) of the second insulating body (41) is in contact with an inner wall surface (10) of the shell (1); One end of the first conductive body (40) is connected to the battery cell body (2), and the other end of the first conductive body (40) passes through the second insulating body (41) and is connected to the positive electrode conductive body (30).

7. The cylindrical battery according to claim 6, characterized in that: The second insulating body (41) comprises a first mounting surface (411) and a second mounting surface (412) which are arranged opposite to each other; the collecting plate (4) further comprises: a first baffle (42) arranged on the first mounting surface (411), the first baffle (42) extending along the circumferential direction of the second insulating body (41) to enclose a first mounting cavity (43), at least a portion of the battery cell body (2) being located in the first mounting cavity (43); A second baffle (44) is arranged on the second mounting surface (412), and the second baffle (44) extends along the circumferential direction of the second insulating body (41) to enclose a second mounting cavity (45). The pressure relief portion (330) is connected to the second mounting cavity (45), and at least a portion of the second baffle (44) is in contact with the inner wall surface (10).

8. The cylindrical battery according to claim 7, characterized in that: The battery cell body (2) is provided with a liquid inlet channel (20), and the current collecting plate (4) further comprises: A circulation hole (46) is arranged on the second insulating body (41), and the circulation hole (46) is opposite to and communicates with the liquid inlet channel (20); The second mounting surface (412) is inclined from the edge of the second insulating body (41) toward the flow hole (46).

9. The cylindrical battery according to claim 7 or 8, characterized in that: The first conductive body (40) comprises: A first connecting body (401), a bending body (402) and a second connecting body (403) connected in sequence, one end of the first connecting body (401) being electrically connected to the battery cell body (2), and the other end of the first connecting body (401) passing through the second insulating body (41) and then connected to the bending body (402); The bent body (402) is located in the second mounting cavity (45) and is spaced apart from the second mounting surface (412); One end of the second connecting body (403) is connected to the bent body (402), and the other end is connected to the positive electrode cap (3).

10. The cylindrical battery according to claim 8, characterized in that: The cylindrical battery also includes: A conductive adhesive layer (6) is arranged between the battery cell body (2) and the current collecting plate (4), and the conductive adhesive layer (6) is respectively bonded to the battery cell body (2) and the first conductive body (40); The conductive adhesive layer (6) is provided with an avoidance channel (60), and the avoidance channel (60) is respectively opposite to the liquid inlet channel (20) and the flow hole (46).

11. The cylindrical battery according to claim 1, characterized in that: A connecting section (11) is provided at the end of the housing (1), and the connecting section (11) comprises a third connecting body (110) and a fourth connecting body (111) which are connected to each other; One end of the third connecting body (110) is connected to the end of the shell (1), and the other end of the third connecting body (110) extends toward the center line direction of the shell (1); one end of the fourth connecting body (111) is connected to an end of the third connecting body (110) away from the shell (1), and the other end of the fourth connecting body (111) extends along the axial direction of the shell (1); Wherein, at least a portion of the positive electrode cap (3) is buckled onto the fourth connecting body (111) and connected to the fourth connecting body (111).

12. The cylindrical battery according to claim 1, characterized in that: The cylindrical battery further comprises a conductive adhesive layer (6), wherein the conductive adhesive layer (6) is respectively connected to the first conductive body (40) and the battery cell body (2); the battery cell body (2) comprises a plurality of pole pieces (21), and a diaphragm (22) is provided between two adjacent pole pieces (21); Wherein, each of the pole pieces (21) comprises: A first pole piece body (210) and a second pole piece body (211), wherein the second pole piece body (211) is arranged at an end of the first pole piece body (210), and the second pole piece body (211) extends from the first pole piece body (210) along the width direction of the first pole piece body (210); The first pole piece body (210) is bonded to the diaphragm (22), the second pole piece body (211) is connected to the conductive adhesive layer (6), and the width of the second pole piece body (211) is B, 0.3 mm ≤ B ≤ 3.5 mm.

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