CN219696573U

CN219696573U - Cylindrical battery module

Info

Publication number: CN219696573U
Application number: CN202320088140.3U
Authority: CN
Inventors: 甘强; 计进超; 文哲泽; 朱冠楠; 程骞
Original assignee: Shanghai Guoxuan New Energy Co Ltd
Current assignee: Shanghai Guoxuan New Energy Co Ltd
Priority date: 2023-01-30
Filing date: 2023-01-30
Publication date: 2023-09-15
Anticipated expiration: 2033-01-30

Abstract

The utility model discloses a cylindrical battery module, which relates to the technical field of battery manufacturing and comprises a shell and an anode cap integrally arranged at one end of the shell, wherein the other end of the shell is provided with a cathode cap, the cathode cap is in direct contact with the shell, the anode cap is in insulating connection with the shell, a winding core is arranged in the shell, the anode cap comprises an anode column, an anode bus bar and an insulating mechanism, the anode column is arranged at one end of the shell, the anode column is connected with the anode bus bar, and the insulating mechanism is arranged between the anode column and the shell. In the utility model, the positive electrode cap is integrated on the shell, so that the number of parts is reduced, and the structural stability of the battery is enhanced; and the explosion-proof sheet on the positive electrode cap is eliminated, the strength of the positive electrode column is enhanced, and the internal resistance of the positive electrode can be reduced.

Description

Cylindrical battery module

Technical Field

The utility model relates to the technical field of battery manufacturing, in particular to a cylindrical battery module.

Background

The existing cylindrical battery comprises a battery body and positive and negative electrode caps arranged at two ends of the battery body, and the cylindrical lithium battery cap comprises a top cover, an explosion-proof piece, a spacer ring, a connecting piece and a sealing ring; the top cover is sequentially connected with the explosion-proof piece, the isolation ring and the connecting piece to form a cap inner core, the sealing ring is sleeved on the periphery of the cap inner core, the formation of aluminum beads is effectively reduced by the cylindrical lithium battery cap, and the overall safety performance of the battery pack is improved.

The existing cylindrical battery cap structure has more parts, all parts are required to be matched layer by layer, so that the internal resistance value of the cylindrical battery cap is higher, in addition, the welding part of the explosion-proof piece and the edge of the explosion-proof piece are integrally formed into an aluminum ring structure after being punched, when the internal pressure of the battery is overlarge, under the pressing of the top cover structure, the notch on the explosion-proof piece cannot be disconnected in time, the risk of thermal runaway of the battery is easily caused, and potential safety hazards are caused.

Disclosure of Invention

The utility model aims to provide a cylindrical battery module which is used for solving the technical problems.

The technical scheme adopted by the utility model is as follows:

the utility model provides a cylinder battery module, includes casing and integrated install in the anodal block of casing one end, the other end of casing has the negative pole block, the negative pole block with direct contact between the casing, anodal block with insulating connection between the casing, be equipped with in the casing and roll up the core, anodal block includes positive pole post, anodal busbar and insulating mechanism, install the one end of casing the positive pole post, the positive pole post with anodal busbar is connected, the positive pole post with be equipped with between the casing insulating mechanism.

Preferably, the axial section of the positive pole is in an I-shaped arrangement, a mounting hole is formed in one end of the shell, the positive pole part penetrates through the mounting hole to extend into the shell and is connected with the positive bus bar, and the positive bus bar is connected with the positive end of the winding core.

As a further preferred aspect, the insulating mechanism includes a first insulating ring provided at an outer edge of the positive electrode post, and a part of the first insulating ring is located in the mounting hole and the other part is located outside the case.

As a further preferred aspect, the upper end of the first insulating ring is bent outwards to form a bending part, the lower end of the first insulating ring is located in the mounting hole, and the bending part covers one end surface of the shell.

As a further preferred feature, the insulating mechanism further comprises a second insulating ring mounted within the housing and located between the positive post and the housing.

As a further preferable mode, the positive electrode post further comprises a steel ring, wherein the steel ring is arranged on the outer edge of the positive electrode post, and the steel ring is located between the positive electrode post and the first insulating ring.

As a further preference, the positive electrode sealing nail further comprises a positive electrode sealing nail, wherein a first round hole and a second round hole which are coaxially arranged and mutually communicated are formed in the middle of the positive electrode column, the second round hole is positioned on the bottom wall of the first round hole, the outer edge of the joint of the second round hole and the first round hole is excessively chamfered, the positive electrode sealing nail is arranged in the first round hole and the second round hole, and the lower end of the positive electrode sealing nail is connected with the positive electrode busbar.

As a further preferable aspect, the positive electrode sealing nail includes a circular table and a boss integrally connected, the circular table is installed in the first circular hole, and the boss is installed in the second circular hole.

As a further preferable mode, the lithium ion battery cell further comprises a sealing ring, wherein the sealing ring is arranged on the outer edge of the positive pole, one side surface of the sealing ring abuts against the shell, and the other side surface of the sealing ring abuts against the positive pole.

Preferably, the negative electrode cap includes a negative electrode busbar, a negative electrode insulating sheet and a negative electrode cover plate, wherein the negative electrode busbar is installed in the shell and connected with a negative electrode end of the winding core, the negative electrode insulating sheet is installed between the negative electrode busbar and the shell, and the negative electrode cover plate is installed on the negative electrode insulating sheet and connected with the shell.

The technical scheme has the following advantages or beneficial effects:

(1) In the utility model, the positive electrode cap is integrated on the shell, so that the number of parts is reduced, and the structural stability of the battery is enhanced; the explosion-proof sheet on the positive electrode cap is eliminated, the strength of the positive electrode column is enhanced, and the internal resistance of the positive electrode is reduced;

(2) According to the utility model, the shell is directly contacted with the negative electrode cap to form the negative electrode shell, and the negative electrode shell also participates in the battery pack circuit, so that the contact between the liquid cooling plate and the winding core of the battery is increased, the winding core is favorably subjected to rapid temperature rise and temperature reduction thermal management, the safety performance of the winding core in extreme weather is ensured, and the risk of causing thermal runaway of the battery is avoided.

Drawings

Fig. 1 is a first exploded view of a cylindrical battery module according to the present utility model;

fig. 2 is a second exploded view of the cylindrical battery module according to the present utility model;

fig. 3 is a cross-sectional view of a positive cap portion in the present utility model;

fig. 4 is a schematic structural view of the positive electrode post and the positive electrode sealing nail in the present utility model.

In the figure: 1. a housing; 201. a positive electrode post; 202. a positive bus bar; 204. a first insulating ring; 205. a second insulating ring; 206. a steel ring; 207. a positive electrode sealing nail; 208. a first round hole; 209. a second round hole; 210. round bench; 211. a boss; 212. a seal ring; 301. a negative electrode bus bar; 302. a negative electrode insulating sheet; 303. a negative electrode cover plate; 4. a winding core; 5. an insulating tape; 6. and (5) mounting holes.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that, if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like are used, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, only for convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the indicated apparatus or element must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like, as used herein, are used for descriptive purposes only and are not to be construed as indicating or implying any relative importance.

In the description of the present utility model, it should be noted that unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Fig. 1 is a first exploded view of a cylindrical battery module according to the present utility model; fig. 2 is a second exploded view of the cylindrical battery module according to the present utility model; fig. 3 is a cross-sectional view of a positive cap portion in the present utility model; fig. 4 is a schematic structural diagram of a positive electrode post and a positive electrode sealing nail in the present utility model, please refer to fig. 1 to 4, which illustrate a preferred embodiment, and a cylindrical battery module is illustrated, including a housing 1 and a positive electrode cap integrally installed at one end of the housing 1, wherein the other end of the housing 1 is provided with a negative electrode cap, the negative electrode cap is directly contacted with the housing 1, the positive electrode cap is in insulation connection with the housing 1, a winding core 4 is provided in the housing 1, the positive electrode cap includes a positive electrode post 201, a positive electrode busbar 202 and an insulation mechanism, the positive electrode post 201 is installed at one end of the housing 1, the positive electrode post 201 is connected with the positive electrode busbar 202, and the insulation mechanism is provided between the positive electrode post 201 and the housing 1. In this embodiment, referring to fig. 1 and 2, the upper end of the winding core 4 is the positive end, the lower end is the negative end, and an insulating tape 5 is disposed on the periphery of the winding core 4, and the direct contact between the negative cap and the shell 1 makes the shell 1 form the negative shell 1, so that the winding core 1 can participate in a battery power-up loop, and the contact between the liquid cooling plate and the winding core 4 of the battery is increased, which is beneficial to the thermal management of rapid temperature rise and temperature reduction of the winding core 4. And insulation is realized between the positive electrode cap and the shell 1 through an insulation mechanism. The positive electrode cap in the embodiment does not have an explosion-proof piece, so that the strength of the positive electrode column 201 is enhanced, and the internal resistance of the positive electrode can be reduced.

Further, as a preferred embodiment, the axial section of the positive electrode post 201 is in an i-shape, one end of the housing 1 is provided with a mounting hole 6, and the positive electrode post 201 partially extends into the housing 1 through the mounting hole 6 and is connected to the positive electrode busbar 202, and the positive electrode busbar 202 is connected to the positive electrode end of the winding core 4. In this embodiment, as shown in fig. 3, the positive electrode post 201 is partially installed in the mounting hole 6, but does not contact with the inner peripheral wall of the mounting hole 6, and a reserved gap is provided between the positive electrode post and the mounting hole, so as to install the first insulating ring 204, thereby realizing insulating connection between the positive electrode post and the mounting hole.

Further, as a preferred embodiment, the insulating mechanism includes a first insulating ring 204, where the first insulating ring 204 is disposed on the outer edge of the positive electrode post 201, and a part of the first insulating ring 204 is located in the mounting hole 6, and another part is located outside the casing 1.

Further, as a preferred embodiment, the upper end of the first insulating ring 204 is bent outwards to form a bent portion, the lower end of the first insulating ring 204 is located in the mounting hole 6, and the bent portion covers one end surface of the housing 1. Referring to fig. 1, the lower end of the first insulating ring 204 is located between the outer wall of the positive electrode post 201 and the inner wall of the mounting hole 6 for insulation therebetween, and the bent portion of the upper end of the first insulating ring 204 is located at the upper end surface of the case 1.

Further, as a preferred embodiment, the insulation mechanism further includes a second insulation ring 205, and the second insulation ring 205 is installed in the case 1 and located between the positive electrode post 201 and the case 1. Referring to fig. 3, the bottom of the second insulating ring 205 is provided with a protruding structure protruding downward, and the protruding structure abuts against the outer edge of the lower end of the positive electrode post 201 and the inner peripheral wall of the casing 1, and the rest of the second insulating ring 205 abuts against the upper surface of the lower end of the positive electrode post 201 and the upper inner wall of the casing 1, as shown in fig. 3.

Further, as a preferred embodiment, the positive electrode post 201 further comprises a steel ring 206, and the outer edge of the positive electrode post 201 is further provided with the steel ring 206, and the steel ring 206 is located between the positive electrode post 201 and the first insulating ring 204. Referring to fig. 3, the steel ring 206 is made of stainless steel and is sleeved on the upper end of the first insulating ring 204, an annular groove is formed in the upper end of the first insulating ring 204, the steel ring 206 is arranged in the annular groove, and the upper surface of the steel ring 206 abuts against the lower surface of the upper end of the positive electrode column 201 for fixing the first insulating ring 204 between the positive electrode column 201 and the casing 1 in a pressing manner.

Further, as a preferred embodiment, the positive electrode sealing nail 207 is further included, a first round hole 208 and a second round hole 209 which are coaxially arranged and are mutually communicated are formed in the middle of the positive electrode column 201, the second round hole 209 is located on the bottom wall of the first round hole 208, chamfering is excessive on the outer edge of the joint of the second round hole 209 and the first round hole 208, the chamfering range is 0.1-5mm, the chamfering angle is 0-90 degrees, and the chamfering angle can be specifically selected according to requirements. The positive electrode sealing nail 207 is installed in the first circular hole 208 and the second circular hole 209, and the lower end of the positive electrode sealing nail 207 is connected with the positive electrode buss bar 202. Referring to fig. 4, the positive electrode sealing nail 207 is matched with the first round hole 208 and the second round hole 209 on the positive electrode column 201, and the positive electrode sealing nail 207 can be connected and fixed with the positive electrode busbar 202 by means of laser welding or ultrasonic welding or riveting, and then connected and fixed with the positive electrode column 201 by means of laser welding connection. And the positive electrode buss 202 and the positive end of the jellyroll 4 may be laser welded together.

Further, as a preferred embodiment, the positive electrode sealing nail 207 includes a circular table 210 and a boss 211 integrally connected, the circular table 210 is installed in the first circular hole 208, and the boss 211 is installed in the second circular hole 209. The diameter of the round table 210 is larger than that of the boss 211, and the round table 210 is installed in the first round hole 208 in a laser welding connection mode, and the boss 211 is installed in the second round hole 209 in a laser welding connection mode or a riveting connection mode.

Further, as a preferred embodiment, the battery pack further comprises a sealing ring 212, wherein the sealing ring 212 is arranged at the outer edge of the positive electrode column 201, one side surface of the sealing ring 212 is abutted against the casing 1, and the other side surface is abutted against the positive electrode column 201. The sealing ring 212 is used for sealing between the positive electrode column 201 and the casing 1, and prevents electrolyte of a battery of the casing 1 from leaking.

Further, as a preferred embodiment, the negative electrode cap includes a negative electrode bus bar 301, a negative electrode insulating sheet 302, and a negative electrode cap plate 303, the negative electrode bus bar 301 is mounted in the case 1 and connected to the negative electrode end of the winding core 4, the negative electrode insulating sheet 302 is mounted between the negative electrode bus bar 301 and the case 1, and the negative electrode cap plate 303 is mounted on the negative electrode insulating sheet 302 and connected to the case 1. In this embodiment, as shown in fig. 2, the negative electrode bus bar 301 is mounted inside the negative electrode insulating sheet 302, and the negative electrode bus bar 301 and the negative electrode end of the winding core 4 are welded together by laser, and the negative electrode cover plate 303 is mounted at one end of the negative electrode insulating sheet 302 away from the winding core 4, and is located at the other end of the case 1, and is connected with the other end of the case 1 in a sealing manner. The negative electrode busbar 301 and the shell 1 are welded by laser, which is beneficial to controlling the state of the winding core 4 and increasing the stability of the winding core 4.

The positive electrode bus bar 202 and the positive electrode end of the winding core 4 are welded together by laser, the positive electrode sealing nail 207 and the positive electrode bus bar 202 are welded together by laser or ultrasonic or riveted together, the positive electrode sealing nail 207 and the positive electrode column 201 are connected by laser welding, the first insulating ring 204, the second insulating ring 205 and the sealing ring 212 are arranged at corresponding positions on the positive electrode column 201, and then the steel ring 206 is arranged on the insulating ring. The roll core 4 can be pushed when the negative electrode cap is installed, the roll core 4 moves up and down to drive the positive electrode column 201 to extrude the sealing ring 212, sealing between the positive electrode column 201 and the shell 1 is achieved, the positive electrode cap can be fixed at the upper end of the shell 1 through the arrangement of the steel ring 206, when the negative electrode cap is installed, the negative electrode end of the roll core 4 and the negative electrode busbar 301 are welded together by laser, the negative electrode insulating sheet 302 is installed between the negative electrode busbar 301 and the shell 1, the negative electrode cover plate 303 is installed on the negative electrode insulating sheet 302, and the negative electrode cover plate 303 is connected with the other end of the shell 1 in a sealing mode.

The foregoing description is only illustrative of the preferred embodiments of the present utility model and is not to be construed as limiting the scope of the utility model, and it will be appreciated by those skilled in the art that equivalent substitutions and obvious variations may be made using the description and illustrations of the present utility model, and are intended to be included within the scope of the present utility model.

Claims

1. The utility model provides a cylinder battery module, its characterized in that, including casing and integrated install in the positive pole cap of casing one end, the other end of casing has the negative pole cap, the negative pole cap with direct contact between the casing, the positive pole cap with insulating connection between the casing, be equipped with the book core in the casing, the positive pole cap includes positive pole post, positive busbar and insulating mechanism, install the one end of casing the positive pole post, the positive pole post with positive busbar is connected, the positive pole post with be equipped with between the casing insulating mechanism.

2. The cylindrical battery module according to claim 1, wherein the axial section of the positive electrode post is provided in an i-shape, a mounting hole is provided at one end of the case, the positive electrode post portion extends into the case through the mounting hole and is connected with the positive electrode bus bar, and the positive electrode bus bar is connected with the positive electrode end of the winding core.

3. The cylindrical battery module according to claim 2, wherein the insulating mechanism comprises a first insulating ring provided at an outer edge of the positive electrode post, and a part of the first insulating ring is located in the mounting hole and the other part is located outside the case.

4. The cylindrical battery module according to claim 3, wherein the upper end of the first insulating ring is bent outward to form a bent portion, the lower end of the first insulating ring is positioned in the mounting hole, and the bent portion covers one end surface of the case.

5. The cylindrical battery module according to claim 2, wherein the insulating mechanism further comprises a second insulating ring mounted within the housing and located between the positive post and the housing.

6. The cylindrical battery module according to claim 3, further comprising a steel ring, wherein the outer edge of the positive electrode post is further provided with the steel ring, and the steel ring is located between the positive electrode post and the first insulating ring.

7. The cylindrical battery module according to claim 2, further comprising a positive electrode sealing nail, wherein a first round hole and a second round hole which are coaxially arranged and communicated with each other are formed in the middle of the positive electrode column, the second round hole is positioned on the bottom wall of the first round hole, the outer edge of the joint of the second round hole and the first round hole is excessively chamfered, the positive electrode sealing nail is installed in the first round hole and the second round hole, and the lower end of the positive electrode sealing nail is connected with the positive electrode busbar.

8. The cylindrical battery module according to claim 7, wherein the positive electrode sealing nail comprises a circular truncated cone and a boss which are integrally connected, the circular truncated cone is installed in the first circular hole, and the boss is installed in the second circular hole.

9. The cylindrical battery module according to claim 4, further comprising a seal ring provided on an outer periphery of the positive electrode post, wherein one side surface of the seal ring abuts against the housing, and the other side surface abuts against the positive electrode post.

10. The cylindrical battery module according to claim 1, wherein the negative cap includes a negative electrode buss bar mounted in the case and connected to the negative electrode end of the winding core, a negative electrode insulating sheet mounted between the negative electrode buss bar and the case, and a negative electrode cap plate mounted on the negative electrode insulating sheet and connected to the case.