CN112103409B - Three-section type battery shell - Google Patents
Three-section type battery shell Download PDFInfo
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- CN112103409B CN112103409B CN201910520129.8A CN201910520129A CN112103409B CN 112103409 B CN112103409 B CN 112103409B CN 201910520129 A CN201910520129 A CN 201910520129A CN 112103409 B CN112103409 B CN 112103409B
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- end cover
- edge
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention provides a three-section battery shell which comprises a first end cover, a middle shell and a second end cover. The first end cover and the second end cover are both of a cylindrical structure with end faces and side walls, and an integral cylindrical or square battery shell can be formed through the connection of the side walls of the end covers and the middle shell. The battery shell is connected on the side wall of the battery shell, so that the defects that the traditional battery end cover is welded at the right angle of the battery shell to cause connection at the stress concentration part and the welding part receives larger shearing force are overcome, and the connection strength is improved. In addition, the side walls of the first end cover and the second end cover have certain heights, so that the height of the middle shell can be reduced, the battery cell is easier to be put into the shell, and the battery cell has the advantages of being particularly more advantageous for a large-sized battery.
Description
Technical Field
The invention relates to the field of batteries, in particular to a three-section battery shell.
Background
The battery structure of the multipolar lug or the full lug is beneficial to improving the multiplying power performance of the battery, wherein the structure of the different-side distribution of the anode lug and the cathode lug becomes a preferable structure of the battery because the current is beneficial to uniform distribution. In the battery industry, the battery cell with positive and negative electrode lugs distributed at two ends and the battery shell composed of an upper and a lower transparent shells and an upper and a lower cover plates are generally adopted, so that a battery structure with two ends for collecting current is assembled. In order to fully accommodate the battery cell into the battery case, the height of the battery case needs to be larger than the length of the battery cell, the battery cell is often put into the case during the assembly process, one end of the battery cell is electrically connected with the cover plate pole, the other end of the battery cell is electrically connected with the cover plate pole, and finally the case is sealed with the cover plates at two ends. The assembly process is complex in operation and is difficult to operate due to the limitation of the shape space of the shell. Moreover, the sealing of the casing and the cover plate of the battery is mostly realized by welding the end part of the battery, a right-angle structure is formed at a welding position no matter side welding or top welding, and the right-angle structure formed by welding can lead the position to generate concentrated stress, influence the welding strength and lead the welding position to generate fatigue cracks in the long-term use process of the battery. In the prior art, a solution to increase the thickness of the cover plate is adopted in order to ensure the welding strength, which not only increases the unnecessary weight of the housing, but also wastes materials.
Disclosure of Invention
In view of the above problems, the present invention provides a three-section battery case, which includes a first end cover, a middle case and a second end cover, wherein the first end cover and the second end cover are both in a cylindrical structure with an end face and a side wall, and an integral cylindrical battery case or a square battery case can be formed by connecting the side wall of the first end cover with the middle case and connecting the side wall of the second end cover with the middle case. The battery shell is connected on the side wall of the battery shell, so that the defects that the connection is carried out at the stress concentration part and the welding part receives larger shearing force are overcome, and the connection strength is improved. In addition, the side walls of the first end cover and the second end cover have certain heights, so that the height of the middle shell can be reduced, the battery cell is easier to be put into the shell, and the battery cell has the advantages of being particularly more advantageous for a large-sized battery.
The technical scheme provided by the invention is as follows:
according to the invention, the battery shell comprises a first end cover, a middle shell and a second end cover, wherein the first end cover is a cylinder with a side wall and an end face, the middle shell is a cylinder with two open ends, the height of the middle shell is smaller than that of a battery cell so that lugs at two ends of the battery cell extend out of two ends of the middle shell respectively, the second end cover is a cylinder with a side wall and an end face, the side wall of the first end cover can be in sealing connection with one end of the middle shell, and the side wall of the second end cover can be in sealing connection with the other end of the middle shell, so that the whole battery shell is formed. The side wall of the first end cap may have a height of 10 to 100mm and the side wall of the second end cap may have a height of 10 to 100mm. Under the condition that the overall height of the battery shell is fixed, the height of the side wall of the end cover can be effectively reduced, so that the battery cell is easier to put into the middle shell, and the lugs at the two ends of the battery cell can extend out from the two ends of the middle shell under the condition that the battery cell is put into the middle shell, so that the follow-up operations such as processing or welding the lugs are facilitated. The connection of the side wall of the first end cover and one end of the middle shell and the connection of the side wall of the second end cover and the other end of the middle shell are all carried out on the side wall avoiding stress concentration at the corner, and the connection modes can be welding, compacting, clamping or bonding.
According to the invention, a structure and a connecting method for connecting an end cover with a middle shell by using a connecting bent edge are provided. The connecting bead may be provided in at least one of the following positions: an edge of a side wall of the first end cap, an edge of a side wall of the second end cap, an edge of one end of the middle housing, and an edge of the other end of the middle housing. The cross-sectional shape of the connecting bead is curved, such as semicircular, arcuate, wavy, dog-ear, or other curved line. The connecting bent edge can be processed by bending, rolling or bending, or the connecting bent edge can be integrally formed with the end cover or the middle shell. When the internal pressure of the battery shell is overlarge, the connecting bent edge deforms, so that the effect of buffering the internal pressure of the battery shell is achieved. In addition, the connecting flange can function as a limiting part, and particularly when the connecting flange is matched with a limiting ring sleeved on the battery cell, the battery cell can be prevented from moving axially in the shell. Preferably, the connecting bead is curved in the direction of the center of the battery housing (i.e. radially inward of the battery housing), which is particularly advantageous for welded connections, and the weld seam of the end cap and the middle housing can be located in the inwardly curved connecting bead, so that the weld seam is no higher than the surface of the battery housing, reducing wear at the welded site. When the end cover and the middle shell are both provided with connecting bent edges, the connecting bent edges of the first end cover and the second end cover can be respectively and hermetically connected with the connecting bent edges of the middle shell.
In one embodiment according to the invention, the edge portions of the connecting bead form a weld for welding, that is to say the free edge of the connecting bead serves as a weld for welding. Specifically, a first end cover connecting bent edge is arranged at the edge of the side wall of the first end cover, and the first end cover connecting bent edge extends continuously along the circumferential direction of the battery shell; the two ends of the middle shell are respectively provided with a first middle shell connecting bent edge and a second middle shell connecting bent edge, and the first middle shell connecting bent edge and the second middle shell connecting bent edge respectively extend continuously along the circumferential direction of the battery shell; and a second end cover connecting bent edge is arranged at the edge of the side wall of the second end cover, and the second end cover connecting bent edge extends continuously along the circumferential direction of the battery shell. The welding part of the first end cover connecting bent edge can be welded with the welding part of the first middle shell connecting bent edge in a sealing way, and the welding part of the second end cover connecting bent edge can be welded with the welding part of the second middle shell connecting bent edge in a sealing way. Several exemplary embodiments of the connecting bead will be listed below. Wherein the cross section of the connection crimp may include an arc-shaped curved portion and a straight portion connected to an end of the arc-shaped curved portion and extending in a radial direction of the battery case, the straight portion of the first end cap connection crimp is aligned with the straight portion of the first middle case connection crimp and can be connected by welding, the edge portion of the straight portion of the second end cap connection crimp is aligned with the edge portion of the straight portion of the second middle case connection crimp and can be connected by welding as a welding portion, that is, the straight portion of the end cap connection crimp is fitted to the straight portion of the middle case connection crimp, and the edge portion of the straight portion of the end cap connection crimp is welded with the edge portion of the straight portion of the middle case connection crimp (i.e., a welding portion). Or wherein the cross section of the connecting bead may be a semicircular curve, the edge portion of the semicircular curve of the first end cap connecting bead and the edge portion of the semicircular curve of the first middle housing connecting bead may be connected by welding as a welded portion, and the edge portion of the semicircular curve of the second end cap connecting bead and the edge portion of the semicircular curve of the second middle housing connecting bead may be connected by welding as a welded portion, that is, the edge portion of the semicircular connecting bead of the end cap and the edge portion of the semicircular connecting bead of the middle housing are tangent and attached, and the edge portion of the semicircular portion of the connecting bead of the end cap and the edge portion of the semicircular portion of the connecting bead of the middle housing (i.e., the welded portion) are welded together. Or wherein the cross section of the connection crimp may include a semicircular curved portion and a straight portion connected to an end of the semicircular curved portion and extending in the axial direction of the battery case, the straight portion of the first end cap connection crimp being aligned with the straight portion of the first middle case connection crimp and being capable of being connected by welding as a welding portion, the straight portion of the second end cap connection crimp being aligned with the straight portion of the second middle case connection crimp and being capable of being connected by welding as a welding portion, that is, the straight portion of the end cap connection crimp being opposite to the straight portion of the middle case connection crimp, and the straight portion of the end cap connection crimp and the straight portion of the middle case connection crimp or an edge portion of the straight portion (i.e., a welding portion) being capable of being connected together by welding.
Preferably, the maximum distance of the welded parts of the first end cap connection crimp, the first middle case connection crimp, the second end cap connection crimp, and the second middle case connection crimp from the central axis of the battery case is smaller than the radius of the battery case. That is, the portion of the connecting bead as the welding portion is retracted from the battery case toward the center of the battery so that the weld does not protrude outward from the battery case after the welding of the welding portion, thereby avoiding the abrasion of the weld and further ensuring the sealing effect of the battery.
In a further embodiment according to the invention, the edge portions of the connecting bead form a hold-down for being held down, that is to say the free edge of the connecting bead serves as a hold-down for being held down. Specifically, the edge portion of the connection crimp extends radially outward along the battery case to form a compression portion to be compressed, wherein the battery case further includes a crimp and a seal ring, the crimp is capable of compressing the compression portion of the connection crimp around the first end cap and the compression portion of the connection crimp around the first middle case in such a manner that the crimp is compressed by bending, the compression portion of the connection crimp around the first end cap, the seal ring between the compression portion of the connection crimp around the first middle case and the compression portion of the connection crimp around the second end cap, and the other crimp is capable of compressing the compression portion of the connection crimp around the second end cap, the compression portion of the connection crimp around the second middle case, and the seal ring between the compression portion of the connection crimp around the second end cap and the compression portion of the connection crimp around the second middle case in such a manner that the crimp is compressed by bending. The pressing edge can be strip-shaped, and the width of the pressing edge is larger than the sum of the heights of the two adjacent pressing parts, so that the two adjacent pressing parts can be wrapped and pressed. The material of the crimp may be a ductile metal of higher strength (e.g., stainless steel) or an electrolyte resistant thermoplastic (e.g., polypropylene). When utilizing the blank holder to compress tightly the connection, can conveniently realize dismantling and retrieving of battery through excision blank holder, the battery casing alright reuse after through the cleaning process, consequently be favorable to the easy disassembly recovery operation and the design of battery more.
Preferably, the maximum distance of the pressing portions of the first end cap connection crimp, the first middle case connection crimp, the second end cap connection crimp, and the second middle case connection crimp from the central axis of the battery case is smaller than the radius of the battery case. That is, the portion of the connecting crimp as the pressing portion is retracted from the battery case toward the battery center so that the crimp does not protrude outward from the battery case after the pressing portion is pressed by the crimp, thereby avoiding the wear of the crimp and further ensuring the sealing effect of the battery.
Preferably, the pressing edge is provided with a groove, and the thickness of the part of the pressing edge, where the groove is arranged, is smaller than the thickness of the part of the pressing edge, where the groove is not arranged. When the pressure in the battery shell is overlarge, the part of the pressing edge, which is provided with the groove, is firstly broken due to the thinner thickness of the part, so that the part can replace an explosion-proof valve to play an explosion-proof role.
As for the material of the battery case, the materials of the first end cap, the second end cap, and the middle case may be metallic materials such as stainless steel. In this case, it is necessary to draw the positive electrode post from the case and to ensure an insulating seal between the positive electrode post and the case, and to weld the positive electrode post and the positive electrode tab of the battery cell together, and similarly, it is necessary to draw the negative electrode post from the case and to ensure an insulating seal between the negative electrode post and the case, and to weld the negative electrode post and the negative electrode tab of the battery cell together. According to a preferred embodiment of the invention, insulation between the first end cap and the middle housing and insulation between the second end cap and the middle housing may be provided, such that insulation between the first end cap and the second end cap is achieved, for example: the first end cover and the second end cover are made of metal materials, and the middle shell is made of insulating materials; alternatively, the materials of the first end cover, the second end cover and the middle shell are metal materials, the part of the first end cover adjacent to the middle shell and/or the part of the middle shell adjacent to the first end cover are coated by insulating materials, and the part of the second end cover adjacent to the middle shell and/or the part of the middle shell adjacent to the second end cover are coated by insulating materials; etc. The insulating material may be, for example, polypropylene, polyethylene, polytetrafluoroethylene, or the like. Therefore, the first end cover can be directly or indirectly electrically connected with the positive electrode lug of the battery cell, and the second end cover can be directly or indirectly electrically connected with the negative electrode lug of the battery cell. In addition, the step of electrically connecting the tab with the end cap to achieve insulating sealing between the post and the case by an additional insulating member may be omitted. Under the condition of insulation between the first end cover and the second end cover, the positive pole post and the negative pole post can be respectively integrated with the first end cover and the second end cover, or the positive pole post and the negative pole post can be connected to the end cover in a simple mode of threaded connection, adhesion, clamping connection and the like, so that assembly parts are reduced, and the battery assembly process is simpler and is convenient to operate.
The surface of the battery case may further include a convex portion and a concave portion. The protruding part of the shell can be a plurality of reinforcing ribs, a concave part is formed between every two adjacent reinforcing ribs in the plurality of reinforcing ribs, and the reinforcing ribs can play a role in reinforcing the strength of the shell; alternatively, the convex and concave portions are formed by bending a plate material for forming the battery case, in other words, portions similar to grooves and protrusions are formed on the surface of the battery case by bending the plate material; alternatively, the protruding portions and the recessed portions may be formed on the battery case by punching, stretching, molding, or the like. When a plurality of batteries are arranged side by side, the convex and concave portions of the battery case surface may form a fluid flow path between two adjacent battery cases, so that the heat dissipation may be enhanced.
The invention has the advantages that:
1) The battery shell structure is more convenient for the battery core to be put into the shell, and the battery cores distributed on different sides of the lugs can simultaneously process the electric connection process of the lugs at two ends and the end cover, so that the complicated operation of lug connection and the limitation of operation space in the prior art are avoided.
2) The connecting position of the battery shell avoids the right-angle position with weaker battery strength by combining the traditional battery shell and the cover plate, so that the strength of the connecting part is higher, and in addition, the cover plate does not need to be thickened for increasing the connecting strength, thereby saving materials and cost and improving the energy density of the battery.
Drawings
FIGS. 1 (a) -1 (b) are an overall schematic and an exploded schematic of a battery case according to the present invention;
FIGS. 2 (a) -2 (b) are an overall schematic view and a partial enlarged view of another battery case according to the present invention;
fig. 3 (a) -3 (b) are an overall schematic and a partial enlarged view of still another battery case according to the present invention;
fig. 4 (a) -4 (b) are schematic views of a battery case according to the present invention during battery assembly;
fig. 5 is a partial sectional view schematically showing a battery case connection structure according to a first embodiment of the present invention;
fig. 6 is a partial sectional view schematically showing a battery case connection structure according to a second embodiment of the present invention;
fig. 7 is a partial sectional view schematically showing a battery case connection structure according to a third embodiment of the present invention;
fig. 8 is a partial sectional view schematically showing a battery case connection structure according to a fourth embodiment of the present invention;
fig. 9 is a partial sectional view schematically showing a battery case connection structure according to a fifth embodiment of the present invention;
fig. 10 is a partial sectional view schematically showing a battery case connection structure according to a sixth embodiment of the present invention.
List of reference numerals
1-end cap
1 a-first end cap
1 b-second end cap
101-sidewall
102-end face
103-through hole
2-middle casing
201-groove
202-collar
3-cell
301-positive electrode tab
302-negative electrode tab
4-connecting crimp
401-weld portion
402-pressing part
5-sealing ring
6-edge pressing
601-groove
Detailed Description
The invention will be further illustrated by way of example with reference to the accompanying drawings.
Fig. 1 (a) -1 (b) are an overall schematic view and an exploded schematic view of a battery case according to the present invention. As shown in fig. 1 (a), 1 (b), the battery case includes a first end cap 1a, a middle case 2, and a second end cap 1b. The first end cap 1a is provided with a side wall 101 and an end face 102, the second end cap 1b is also provided with a side wall 101 and an end face 102, and the middle housing 2 is cylindrical with two open ends. The height h1 of the side wall 101 of the first end cover 1a and the height h2 of the side wall 101 of the second end cover 1b are respectively 10-100 mm, and the height h3 of the middle shell 2 can be effectively shortened through the height h1 of the side wall 101 of the first end cover 1a and the height h2 of the side wall 101 of the second end cover 1b, so that the tabs at two ends of the battery core can extend out of the openings at two ends of the middle shell 2 so as to perform various operations such as tab treatment, tab electric connection and the like. The side wall 101 of the first end cap 1a may be in sealing connection with one end of the middle housing 2, and the side wall 101 of the second end cap 1b may be in sealing connection with the other end of the middle housing 2.
Fig. 2 (a) -2 (b) are an overall schematic view and a partial enlarged view of another battery case according to the present invention. The first end cap 1a, the middle case 2, and the second end cap 1b of the battery case are all made of stainless steel. In order to insulate between the first end cap 1a and the second end cap 1b, the portion of the middle housing 2 adjacent to the first end cap 1a is covered with an insulating material (see fig. 2 (b)) and the portion of the middle housing 2 adjacent to the second end cap 1b is covered with an insulating material. In the case of insulation between the first end cap 1a and the second end cap 1b, the first end cap 1a and the second end cap 1b may be electrically connected with the positive electrode tab and the negative electrode tab of the battery cell, respectively. As shown in fig. 2 (a), through holes 103 may be formed in the first end cap 1a and the second end cap 1b, respectively, and positive and negative electrode posts may be led out of the through holes 103, respectively, without additional insulating members between the posts and the end caps.
Fig. 3 (a) -3 (b) are an overall schematic and a partial enlarged view of still another battery case according to the present invention. In order to insulate between the first end cap 1a and the second end cap 1b, the first end cap 1a and the second end cap 1b of the battery case are both made of stainless steel, and the middle case 2 is made of polyethylene. Grooves 201 may be provided at both ends of the middle housing 2, a collar 202 made of a metal material may be provided in the grooves 201, and edge portions of the side walls of the end caps may be welded with the collar 202, thereby achieving connection between the middle housing 2 and the end caps. In the case of insulation between the first end cap 1a and the second end cap 1b, the first end cap 1a and the second end cap 1b may be electrically connected with the positive electrode tab and the negative electrode tab of the battery cell, respectively. As shown in fig. 3 (a), the positive electrode post and the first end cap 1a may be integrally formed, and the negative electrode post and the second end cap 1b may be integrally formed.
Fig. 4 (a) -4 (b) are schematic views of a battery case according to the present invention during battery assembly. The three-section type battery shell can be more beneficial to the assembly of the battery and the treatment of the lugs, so that the battery assembly process is simpler and more convenient, the operation is easier, and the utilization rate of the internal space is high. According to a preferred embodiment of the present invention, the first end cap 1a and the second end cap 1b of the battery case can be integrally combined and led out, and are not necessarily limited to the electrode post leading out, and the contact area between the electrode tab and the end cap is larger, so that the current collection is facilitated. In this embodiment, as shown in fig. 4 (a), during the battery assembly process, the battery cell 3 is inserted into the middle case 2, both ends of the battery cell 3 protrude from both openings of the middle case 2, the positive electrode tab 301 is electrically connected to the inner surface of the end face of the first end cap 1a, and the negative electrode tab 302 is electrically connected to the inner surface of the end face of the second end cap 1b. When the tab is electrically connected to the end face of the end cap, since the tab portion required for the electrical connection operation protrudes outward from both ends of the middle case 2, it is not necessary to pull out the battery cell 3 from the case or push the battery cell 3 into the case so as to perform the electrical connection operation at both ends of the battery cell, respectively. As shown in fig. 4 (b), after the tab and the end cap are electrically connected, the first end cap 1a and the second end cap 1b are only required to be hermetically connected with the middle case 2.
Fig. 5 is a partial sectional view schematically showing a battery case connection structure according to a first embodiment of the present invention. In this embodiment, the edge portions of the side walls of the end cap 1 are edge portions in the form of straight edges extending in the axial direction Y of the battery case, the edge portions of both ends of the middle case 2 are also edge portions in the form of straight edges extending in the axial direction Y of the battery case, the straight edge portions of the end cap 1 may be aligned with the straight edge portions of the middle case 2, and the connection of the end cap 1 with the middle case 2 may be accomplished at the side wall portions of the battery case by welding. The connecting part of the end cover 1 and the middle part shell 2 is arranged on the side wall of the battery shell, and avoids the right-angle part with concentrated stress of the battery shell, so that the connecting part can be subjected to smaller stress, and the sealing connection effect and the service life of the connecting part are improved.
Fig. 6 is a partial sectional view schematically showing a battery case connection structure according to a second embodiment of the present invention. In this embodiment, the edge of the side wall of the end cover 1 is provided with a connecting bent edge 4, the cross-section of the connecting bent edge 4 is semicircular, the upper end and the lower end of the semicircular connecting bent edge 4 are provided with transition arc parts, the upper transition arc part is smoothly connected with the side wall of the end cover 1, and the lower transition arc part can be smoothly connected with the straight edge of the end part of the middle shell 2. When the pressure inside the battery case is excessively large, the connecting crimping 4 can function to buffer the internal pressure.
Fig. 7 is a partial sectional view schematically showing a battery case connection structure according to a third embodiment of the present invention. In this embodiment, the edge of the side wall of the end cap 1 and the edge of the end of the middle housing 2 are provided with connecting beads 4. The cross section of the connecting crimp 4 is a semicircular curve, and an edge portion of the semicircular curve of the connecting crimp 4 of the end cover 1 and an edge portion of the semicircular curve of the connecting crimp 4 of the middle case 2 can be connected as a welding portion 401 by welding. The connecting bead 4 is bent toward the center direction of the battery case, i.e., the connecting bead 4 is bent toward the inside of the battery case, so that the weld can be located in a space formed by the inwardly bent connecting bead at the time of welding, and therefore the weld does not protrude outwardly from the side wall of the battery case, and further wear and damage of the weld can be avoided.
Fig. 8 is a partial sectional view schematically showing a battery case connection structure according to a fourth embodiment of the present invention. In this embodiment, the edge of the side wall of the end cap 1 and the edge of the end of the middle housing 2 are provided with connecting beads 4. The cross section of the connecting crimping 4 includes an arc-shaped curved portion and a straight portion connected to an end of the arc-shaped curved portion and extending in the radial direction X of the battery case, the straight portion of the connecting crimping 4 of the end cap 1 and the straight portion of the connecting crimping 4 of the middle case 2 may be aligned and fitted, and an edge portion of the straight portion of the connecting crimping 4 of the end cap 1 and an edge portion of the straight portion of the connecting crimping 4 of the middle case 2 may be connected as a welding portion 401 by welding. The maximum distance D of the welded portion 401 from the center axis of the battery case is smaller than the radius R of the battery case. Therefore, the welding seam can be effectively protected from external abrasion, the sealing effect of the welding part can be ensured, and the service life of the battery is prolonged.
Fig. 9 is a partial sectional view schematically showing a battery case connection structure according to a fifth embodiment of the present invention. In this embodiment, the edge of the side wall of the end cap 1 and the edge of the end of the middle housing 2 are provided with connecting beads 4. The connecting bead 4 has a semicircular curve in cross section, and the edge portion of the semicircular curve of the connecting bead 4 of the end cap 1 and the edge portion of the semicircular curve of the connecting bead 4 of the middle case 2 extend substantially radially outward of the battery case and form a pressing portion 402. A sealing ring 5 is arranged between the pressing part 402 of the end cover 1 and the pressing part 402 of the middle shell 2, and the pressing part 402 of the end cover 1 and the outer part of the pressing part 402 of the middle shell 2 are covered and pressed by a pressing edge 6. The pressing edge 6 is provided with a groove 601, the position of the groove 601 can approximately correspond to the position of the sealing ring 5, and the thickness of the part of the pressing edge 6 where the groove 601 is arranged is smaller than that of the part of the pressing edge 6 where the groove is not arranged. When the pressure in the battery shell is overlarge, the part of the pressure edge, which is provided with the groove, is firstly broken due to the thinner thickness of the part, so that the pressure relief explosion-proof valve can be replaced to play a role in pressure relief explosion-proof.
Fig. 10 is a partial sectional view schematically showing a battery case connection structure according to a sixth embodiment of the present invention. In this embodiment, the edge of the side wall of the end cap 1 and the edge of the end of the middle housing 2 are provided with connecting beads 4. The cross section of the connecting crimping 4 includes an arc-shaped curved portion and a straight portion connected to an end of the arc-shaped curved portion and extending in the radial direction X of the battery case, and the straight portion of the connecting crimping 4 of the end cap 1 and the straight portion of the connecting crimping 4 of the middle case 2 can be fitted in alignment and serve as the pressing portion 402. A sealing ring 5 is arranged between the pressing part 402 of the end cover 1 and the pressing part 402 of the middle shell 2, and the pressing part 402 of the end cover 1 and the outer part of the pressing part 402 of the middle shell 2 are covered and pressed by a pressing edge 6. The pressing edge 6 is provided with a groove 601, the position of the groove 601 can approximately correspond to the position of the sealing ring 5, and the thickness of the part of the pressing edge 6 where the groove 601 is arranged is smaller than that of the part of the pressing edge 6 where the groove is not arranged. When the pressure in the battery shell is overlarge, the part of the pressure edge, which is provided with the groove, is firstly broken due to the thinner thickness of the part, so that the pressure relief explosion-proof valve can be replaced to play a role in pressure relief explosion-proof.
The embodiments of the present invention are not intended to limit the present invention. Any person skilled in the art can make many possible variations and modifications to the technical solution of the present invention or modifications to equivalent embodiments using the methods and technical contents disclosed above, without departing from the scope of the technical solution of the present invention. Therefore, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.
Claims (10)
1. The three-section battery shell is characterized by comprising a first end cover, a middle shell and a second end cover, wherein the first end cover is a cylinder with a side wall and an end face, the middle shell is a cylinder with two open ends, the height of the middle shell is smaller than that of a battery cell so that lugs at two ends of the battery cell respectively extend out of two ends of the middle shell, the second end cover is a cylinder with a side wall and an end face, the side wall of the first end cover can be in sealing connection with one end of the middle shell, the side wall of the second end cover can be in sealing connection with the other end of the middle shell, thereby forming an integral battery shell, the side wall of the first end cover is 10-100 mm in height, the side wall of the second end cover is 10-100 mm in height, at least one of the side wall edge of the first end cover, the side edge of the middle shell, the other end edge of the middle shell and the side wall of the second end cover is provided with a connecting bent edge, the connecting bent edge is formed by the connecting side wall of the curved shell, the connecting side wall of the connecting end cover extends towards the connecting side edge of the curved shell, and the connecting side wall of the curved end cover is formed by continuously welding the connecting side edge of the curved shell; the edges of the two ends of the middle shell are respectively provided with a first middle shell connecting bent edge and a second middle shell connecting bent edge, and the first middle shell connecting bent edge and the second middle shell connecting bent edge respectively extend continuously along the circumferential direction of the battery shell; a second end cover connecting bent edge is arranged at the edge of the side wall of the second end cover, and the second end cover connecting bent edge continuously extends along the circumferential direction of the battery shell, wherein the welding part of the first end cover connecting bent edge can be in sealing welding with the welding part of the first middle shell connecting bent edge, and the welding part of the second end cover connecting bent edge can be in sealing welding with the welding part of the second middle shell connecting bent edge; or, the edge portion of the connecting crimp extends radially outward along the battery case to form a compression portion to be compressed, the battery case further includes a crimp and a seal ring, the crimp can surround the compression portion of the first end cap connecting crimp and the compression portion of the first middle case connecting crimp by bending and extruding the compression portion of the first end cap connecting crimp, the compression portion of the first middle case connecting crimp, and the seal ring disposed between the compression portion of the first end cap connecting crimp and the compression portion of the first middle case connecting crimp are sealed and pressed, and the crimp can surround the compression portion of the second end cap connecting crimp and the compression portion of the second middle case connecting crimp by bending and extruding the compression portion of the second end cap connecting crimp, the compression portion of the second middle case connecting crimp, and the seal ring disposed between the compression portion of the second end cap connecting crimp and the compression portion of the second middle case connecting crimp.
2. The battery case according to claim 1, wherein the cross section of the connection crimp includes an arc-shaped curved portion and a straight portion connected to an end of the arc-shaped curved portion and extending in a radial direction of the battery case, the straight portion of the first end cap connection crimp is aligned with and fitted to the straight portion of the first middle case connection crimp, an edge portion of the straight portion of the first end cap connection crimp and an edge portion of the straight portion of the first middle case connection crimp are connectable as a welded portion by welding, the straight portion of the second end cap connection crimp and the straight portion of the second middle case connection crimp are aligned with and fitted to each other, and an edge portion of the straight portion of the second end cap connection crimp and an edge portion of the straight portion of the second middle case connection crimp are connectable as a welded portion by welding.
3. The battery case according to claim 1, wherein the cross section of the connection crimp is a semicircular curve, an edge portion of the semicircular curve of the first end cap connection crimp and an edge portion of the semicircular curve of the first middle case connection crimp are connectable as a welded portion by welding, and an edge portion of the semicircular curve of the second end cap connection crimp and an edge portion of the semicircular curve of the second middle case connection crimp are connectable as a welded portion by welding.
4. The battery case according to claim 1, wherein the cross section of the connection crimp includes a semicircular curve portion and a straight line portion connected to an end of the semicircular curve portion and extending in an axial direction of the battery case, an edge portion of the straight line portion of the first end cap connection crimp is aligned with an edge portion of the straight line portion of the first middle case connection crimp and can be connected by welding as a welding portion, and an edge portion of the straight line portion of the second end cap connection crimp is aligned with an edge portion of the straight line portion of the second middle case connection crimp and can be connected by welding as a welding portion.
5. The battery housing of claim 1, wherein a maximum distance of a weld of the first end cap connection crimp, the first middle housing connection crimp, the second end cap connection crimp, and the second middle housing connection crimp from a central axis of the battery housing is less than a radius of the battery housing.
6. The battery housing of claim 1, wherein a maximum distance of the pinched portions of the first end cap connection crimp, the first middle housing connection crimp, the second end cap connection crimp, and the second middle housing connection crimp from a central axis of the battery housing is less than a radius of the battery housing.
7. The battery case according to claim 6, wherein a groove is provided on the crimp, and a thickness of a portion of the crimp where the groove is provided is smaller than a thickness of a portion of the crimp where the groove is not provided.
8. The battery housing of claim 1, wherein the materials of the first end cap, the second end cap, and the middle housing are metallic materials.
9. The battery case according to claim 1, wherein the material of the first and second end caps is a metal material, and the material of the middle case is an insulating material; or, the first end cover, the second end cover and the middle shell are made of metal materials, the part, adjacent to the middle shell, of the first end cover and/or the part, adjacent to the first end cover, of the middle shell are coated with insulating materials, and the part, adjacent to the middle shell, of the second end cover and/or the part, adjacent to the second end cover, of the middle shell are coated with insulating materials, so that the first end cover and the second end cover are insulated, and therefore the first end cover and a positive electrode lug of a battery cell can be directly or indirectly electrically connected, and the second end cover and a negative electrode lug of the battery cell can be directly or indirectly electrically connected.
10. The battery case according to claim 1, wherein a surface of the battery case includes a convex portion and a concave portion through which a fluid communication passage is formed between two adjacent battery cases when a plurality of the battery cases are juxtaposed.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910520129.8A CN112103409B (en) | 2019-06-17 | 2019-06-17 | Three-section type battery shell |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910520129.8A CN112103409B (en) | 2019-06-17 | 2019-06-17 | Three-section type battery shell |
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| CN112103409A CN112103409A (en) | 2020-12-18 |
| CN112103409B true CN112103409B (en) | 2023-05-26 |
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| US6042967A (en) * | 1998-07-29 | 2000-03-28 | Duracell Inc | End cap seal assembly for an electrochemical cell |
| KR20130101418A (en) * | 2012-03-05 | 2013-09-13 | 삼성에스디아이 주식회사 | Secondary battery |
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| Publication number | Publication date |
|---|---|
| CN112103409A (en) | 2020-12-18 |
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Address after: No. 1, 1st Floor, Building 4, No. 10, South 3rd Road, Shodu, Wuhou District, Chengdu City, Sichuan Province, 610043 Patentee after: Haofengguang Energy storage (Chengdu) Co.,Ltd. Address before: 1711, 17th floor, building 2, yard 1, Shangdi 10th Street, Haidian District, Beijing 100085 Patentee before: Beijing Hawaga Power Storage Technology Co.,Ltd. |
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