A square aluminum-cased lithium-ion battery cover

Abstract

This invention discloses a square aluminum-cased lithium-ion battery cover plate, comprising a lower plastic plate, a positive electrode post, a negative electrode post, a positive electrode insulating sleeve, a negative electrode insulating sleeve, and a metal substrate. A positive electrode connecting piece is integrally stamped and formed by pressing the bottom of the positive electrode post downwards, and a negative electrode connecting piece is integrally stamped and formed by pressing the bottom of the negative electrode post downwards. The lower plastic plate has positive and negative electrode mounting grooves. The metal substrate has a positive electrode post mounting groove corresponding to the positive electrode post and a negative electrode post mounting groove corresponding to the negative electrode post. A positive electrode post sealing ring is provided between the positive electrode post mounting groove and the lower plastic plate, and a negative electrode post sealing ring is provided between the negative electrode post mounting groove and the lower plastic plate. The advantages of this invention are: integrally stamping the positive electrode post and positive electrode connecting piece, and integrally stamping the negative electrode post and negative electrode connecting plate, shortens the battery manufacturing cycle and reduces the battery's internal resistance and surface temperature rise.

Description

Technical Field

[0001] This invention relates to a square aluminum-cased lithium-ion battery cover. Background Technology

[0002] With the advancement of technology, the application fields of lithium batteries are expanding further. From mobile phone batteries and electric bicycle batteries to hybrid vehicle batteries, lithium batteries are used everywhere. In these applications, square batteries are usually composed of an aluminum / steel shell, a square cover plate, positive and negative electrode plates, and electrolyte. Due to the variable usage environment and longer service life in this market, higher requirements are placed on the stability of the battery structure. Currently, the mainstream in this market is the square aluminum shell lithium-ion battery. As the core component of the battery structure, the cover plate has higher requirements for stability.

[0003] Chinese patent publication CN202110705669 discloses a square aluminum-cased battery cover, which includes a base plate and a lower plastic plate connected together. A negative electrode connecting piece and a positive electrode connecting piece are connected to the lower plastic plate. Both the negative and positive electrode connecting pieces have insertion holes that penetrate upwards through the base plate and the lower plastic plate. The base plate has an integrally stamped positive electrode post and a recessed negative electrode mounting groove. A T-shaped negative electrode post sealing ring is provided at the negative electrode mounting groove. The inner diameter of the negative electrode terminal sealing ring is interference-fitted with the insertion hole of the negative electrode connecting piece, and the lower end face of the negative electrode terminal sealing ring contacts the substrate surface. A negative electrode terminal is tightly connected inside the negative electrode terminal sealing ring; the diameter of the negative electrode terminal is larger than the negative electrode mounting groove, and the positive electrode terminal and negative electrode terminal contact the insertion holes of the negative electrode connecting piece and positive electrode connecting piece, respectively. A negative electrode insulating sheet and a positive electrode insulating sheet are also fixedly connected to the substrate, and the negative electrode insulating sheet and positive electrode insulating sheet are pressed tightly onto the negative electrode terminal and positive electrode terminal, respectively. The disadvantages of the above-disclosed technology are: a connecting piece needs to be welded to the lower end of both the positive and negative electrode terminals; this can lead to incomplete or excessive soldering of the positive and negative electrode connecting pieces, and the additional welding process results in higher internal resistance and unstable voltage. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a square aluminum-cased lithium-ion battery cover.

[0005] The technical solution adopted by this invention to solve its technical problem is:

[0006] A square aluminum-cased lithium-ion battery cover includes a lower plastic plate, a positive electrode post, a negative electrode post, a positive electrode insulating sleeve, a negative electrode insulating sleeve, and a metal substrate. A positive electrode connecting piece is integrally stamped and formed by pressing the bottom of the positive electrode post downwards, and a negative electrode connecting piece is integrally stamped and formed by pressing the bottom of the negative electrode post downwards. A positive electrode insertion hole is provided at the top of each positive and negative electrode post. The lower plastic plate has positive electrode mounting grooves corresponding to the positive electrode connecting pieces and negative electrode mounting grooves corresponding to the negative electrode connecting pieces. The metal substrate has... The positive electrode has a positive electrode mounting slot and the negative electrode has a corresponding negative electrode mounting slot. The positive electrode insulating sleeve covers the periphery of the positive electrode to isolate the positive electrode and the positive electrode mounting slot, and the negative electrode insulating sleeve covers the periphery of the negative electrode to isolate the negative electrode and the negative electrode mounting slot. A positive electrode sealing ring is provided between the positive electrode mounting slot and the lower plastic plate to isolate the positive electrode connecting piece and the metal substrate, and a negative electrode sealing ring is provided between the negative electrode mounting slot and the lower plastic plate to isolate the negative electrode connecting piece and the metal substrate. The metal substrate is mounted on the lower plastic plate.

[0007] In another preferred embodiment, the metal substrate is provided with a first injection hole and an explosion-proof valve mounting port, the lower plastic plate is provided with a second injection hole corresponding to the position of the first injection hole, and the explosion-proof valve is installed on the explosion-proof valve mounting port and covered with an explosion-proof sealing sheet.

[0008] In another preferred embodiment, a first limiting structure is provided around the bottom of the positive electrode post, and a first recessed step corresponding to the first limiting structure is provided on the lower plastic plate; a second limiting structure is provided around the bottom of the negative electrode post, and a second recessed step corresponding to the second limiting structure is provided on the lower plastic plate.

[0009] In another preferred embodiment, the first limiting structure and the second limiting structure are regular hexagons.

[0010] In another preferred embodiment, a traceability code is provided on the front side of the metal substrate; and an identifier is provided in the middle of the lower plastic plate.

[0011] In another preferred embodiment, a first annular protrusion is provided in the middle of the peripheral wall of the positive electrode post, a first annular groove corresponding to the first annular protrusion is provided in the middle of the inner wall of the positive electrode insulating sleeve, a second annular protrusion is provided in the middle of the peripheral wall of the negative electrode post, and a second annular groove corresponding to the second annular protrusion is provided in the middle of the inner wall of the negative electrode insulating sleeve.

[0012] In another preferred embodiment, a first positioning boss and a second positioning boss are respectively provided on the periphery of the positive electrode mounting groove and the negative electrode mounting groove on the metal substrate, and a first positioning annular groove corresponding to the first positioning boss and a second positioning annular groove corresponding to the second positioning boss are respectively provided on the bottom surface of the positive electrode insulating sleeve and the negative electrode insulating sleeve.

[0013] In another preferred embodiment, the inner walls of the first positioning boss and the second positioning boss are provided as wavy surfaces.

[0014] In another preferred embodiment, the top surface of the positive electrode insulating sleeve is provided with a positive electrode mark, and the top surface of the negative electrode insulating sleeve is provided with a negative electrode mark.

[0015] The beneficial effects of this invention are: the positive electrode post and the positive electrode connecting plate are integrally stamped, and the negative electrode post and the negative electrode connecting plate are integrally stamped, which changes the traditional manufacturing process, shortens the battery manufacturing cycle, reduces the battery internal resistance and battery surface temperature rise, increases the current flow area of ​​the current collector, reduces the battery interface resistance, and improves the battery safety factor.

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the square aluminum shell lithium-ion battery cover of the present invention is not limited to the embodiments. Attached Figure Description

[0017] Figure 1 This is an exploded structural diagram of a preferred embodiment of the present invention.

[0018] Figure 2 This is a three-dimensional schematic diagram of the overall installation structure of a preferred embodiment of the present invention. Figure 1 .

[0019] Figure 3 This is a three-dimensional schematic diagram of the overall installation structure of a preferred embodiment of the present invention. Figure 2 .

[0020] Figure 4 This is a front view of the overall installation structure of a preferred embodiment of the present invention.

[0021] Figure 5 yes Figure 4 A cross-sectional view along the AA direction.

[0022] Figure 6 yes Figure 4 Cross-sectional view along the BB direction. Detailed Implementation

[0023] See the example. Figures 1 to 6 As shown, a square aluminum-cased lithium-ion battery cover of the present invention includes a lower plastic plate 1, a positive electrode post 2, a negative electrode post 3, a positive electrode insulating sleeve 4, a negative electrode insulating sleeve 5, and a metal substrate 6.

[0024] The bottom of the positive electrode post 2 extends downwards and is integrally stamped to form a positive electrode connecting piece 7. The whole is made of aluminum. The top of the positive electrode post 2 is provided with a positive electrode insertion hole 2-1. The middle of the peripheral wall of the positive electrode post 2 is provided with a first annular boss 2-2. Both the area above and below the first annular boss are set as regular hexagons. A first limiting structure 2-3 is formed below the first annular boss. The negative electrode post 3 has a similar structure to the positive electrode post 2. The bottom of the negative electrode post 3 extends downwards and is integrally stamped to form a negative electrode connecting piece 8. The whole is made of nickel and copper. The top of the negative electrode post 3 is provided with a negative electrode insertion hole 3-1. The middle of the peripheral wall of the negative electrode post 3 is provided with a second annular boss 3-2. Both the area above and below the second annular boss are set as regular hexagons. A second limiting structure 3-3 is formed below the second annular boss.

[0025] The inner wall of the positive electrode insulating sleeve 4 has a first annular groove 4-1 corresponding to the first annular protrusion 2-2 in the middle. The area above and below the first annular groove corresponds to the area above and below the first annular protrusion, respectively, and are respectively set as regular hexagons. The inner wall of the negative electrode insulating sleeve 5 has a second annular groove 5-1 corresponding to the second annular protrusion 3-2 in the middle. The area above and below the second annular groove corresponds to the area above and below the second annular protrusion, respectively, and are respectively set as regular hexagons. Therefore, the positive electrode insulating sleeve 4 can tightly wrap the peripheral wall of the positive electrode post 2, and the negative electrode insulating sleeve 5 can tightly wrap the peripheral wall of the negative electrode post 3. The top surface of the positive electrode insulating sleeve 4 has a positive electrode marking, and the top surface of the negative electrode insulating sleeve 5 has a negative electrode marking.

[0026] The lower plastic plate 1 is provided with a positive electrode mounting groove 1-1 corresponding to the positive electrode connecting piece 7 and a negative electrode mounting groove 1-2 corresponding to the negative electrode connecting piece 8. The lower plastic plate 1 is provided with a first recessed step 1-3 corresponding to the first limiting structure 2-3, and a second recessed step 1-4 corresponding to the second limiting structure 33. In this way, the positive electrode connecting piece 7 of the positive electrode post 2 is inserted into the positive electrode mounting groove 1-1, and the first limiting structure 2-3 of the positive electrode post 2 is correspondingly embedded in the first recessed step 1-3. The negative electrode connecting piece 8 of the negative electrode post 3 is inserted into the negative electrode mounting groove 1-2, and the second limiting structure 33 of the negative electrode post 3 is correspondingly embedded in the second recessed step 1-4.

[0027] The metal substrate 6 is provided with a positive electrode mounting groove 6-1 corresponding to the positive electrode post 2 and a negative electrode mounting groove 6-2 corresponding to the negative electrode post 3. A first positioning boss 6-3 and a second positioning boss 6-4 are respectively provided on the periphery of the positive electrode mounting groove 6-1 and the negative electrode mounting groove 6-2 on the metal substrate 6. The bottom surfaces of the positive electrode insulating sleeve 4 and the negative electrode insulating sleeve 5 are respectively provided with a first positioning annular groove corresponding to the first positioning boss 6-3 and a second positioning annular groove corresponding to the second positioning boss 6-4. Figure 5 and Figure 6 As shown, when the positive electrode post 2, which encloses the positive electrode insulating sleeve 4, is embedded in the positive electrode post mounting groove 6-1, and the negative electrode post 3, which encloses the negative electrode insulating sleeve 5, is embedded in the negative electrode post mounting groove 6-2, the first positioning boss 6-3 on the metal substrate 6 is adapted to and connected to the first positioning annular groove of the positive electrode insulating sleeve 4, and the second positioning boss 6-4 on the metal substrate 6 is adapted to and connected to the second positioning annular groove of the negative electrode insulating sleeve 5. The inner walls of the first positioning boss 6-3 and the second positioning boss 6-4 are designed with a corrugated surface to improve the tightness of the connection.

[0028] A positive electrode post sealing ring 9 is provided between the positive electrode post mounting groove 6-1 and the lower plastic plate 1 to isolate the positive electrode connecting piece 7 and the metal substrate 6. A negative electrode post sealing ring 10 is provided between the negative electrode post mounting groove 6-2 and the lower plastic plate 1 to isolate the negative electrode connecting piece 8 and the metal substrate 6. The metal substrate 6 is mounted on the lower plastic plate 1.

[0029] In this embodiment, the metal substrate 6 is provided with a first liquid injection hole 6-5 and an explosion-proof valve mounting port 6-6. The lower plastic plate 1 is provided with a second liquid injection hole 1-5 corresponding to the position of the first liquid injection hole 6-5. The explosion-proof valve 11 is installed on the explosion-proof valve mounting port 6-6 and covered with an explosion-proof sealing sheet 12. When a safety hazard occurs in the battery, the explosion-proof valve 11 can burst open, reducing the internal pressure of the battery and preventing the battery from catching fire. The front of the metal substrate 6 is provided with a traceability code; the middle of the lower plastic plate 1 is provided with an identifier 1-6.

[0030] The square aluminum-cased lithium-ion battery cover plate of this embodiment is formed by integrally stamping the positive electrode post 2 and the positive electrode connecting piece 7, and integrally stamping the negative electrode post 3 and the negative electrode connecting plate 8. This not only improves the safety factor of the battery, but also changes the traditional battery welding method, thereby making the internal structure of the battery safer and more reliable.

[0031] The above embodiments are only used to further illustrate a square aluminum-cased lithium-ion battery cover plate of the present invention. However, the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A square aluminum-cased lithium-ion battery cover, characterized in that: It includes a lower plastic plate, a positive electrode post, a negative electrode post, a positive electrode insulating sleeve, a negative electrode insulating sleeve, and a metal substrate; the bottom of the positive electrode post extends downward and is integrally stamped to form a positive electrode connecting piece, the bottom of the negative electrode post extends downward and is integrally stamped to form a negative electrode connecting piece, the top of the positive electrode post has a positive electrode insertion hole, and the top of the negative electrode post has a negative electrode insertion hole; the lower plastic plate has a positive electrode mounting groove corresponding to the positive electrode connecting piece and a negative electrode mounting groove corresponding to the negative electrode connecting piece; the metal substrate has a positive electrode post mounting groove corresponding to the positive electrode post and a negative electrode post mounting groove corresponding to the negative electrode post; the positive electrode insulating sleeve covers the periphery of the positive electrode post to isolate the positive electrode post and the positive electrode post mounting groove, and the negative electrode insulating sleeve covers the periphery of the negative electrode post to isolate the negative electrode post and the negative electrode post mounting groove; the positive electrode post mounting groove and the lower plastic plate have a positive electrode connecting piece and a negative electrode connecting piece; the bottom of the positive electrode post extends downward and is integrally stamped to form a negative electrode connecting piece; the bottom of the positive electrode post has a positive electrode insertion hole, and the top of the negative electrode post has a negative electrode insertion hole; the bottom of the lower plastic plate has a positive electrode connecting piece mounting groove corresponding to the positive electrode connecting piece and a negative electrode connecting piece mounting groove; the bottom of the lower plastic plate has a positive electrode connecting piece mounting groove corresponding to the positive electrode connecting piece and a negative electrode connecting piece mounting groove, and the top of the metal substrate has a positive electrode connecting piece mounting groove corresponding to the positive electrode post ... A positive electrode sealing ring is provided between the plastic plates to isolate the positive electrode connecting piece and the metal substrate. A negative electrode sealing ring is provided between the negative electrode mounting groove and the lower plastic plate to isolate the negative electrode connecting piece and the metal substrate. The metal substrate is mounted on the lower plastic plate. A first limiting structure is provided around the bottom edge of the positive electrode, and a first recessed step corresponding to the first limiting structure is provided on the lower plastic plate. A second limiting structure is provided around the bottom edge of the negative electrode, and a second recessed step corresponding to the second limiting structure is provided on the lower plastic plate. A first annular boss is provided in the middle of the peripheral wall of the positive electrode, and a first annular groove corresponding to the first annular boss is provided in the middle of the inner wall of the positive electrode insulating sleeve. A second annular boss is provided in the middle of the peripheral wall of the negative electrode, and a second annular groove corresponding to the second annular boss is provided in the middle of the inner wall of the negative electrode insulating sleeve.

2. The square aluminum-cased lithium-ion battery cover plate according to claim 1, characterized in that: The metal substrate is provided with a first injection hole and an explosion-proof valve mounting port. The lower plastic plate is provided with a second injection hole corresponding to the position of the first injection hole. The explosion-proof valve is installed on the explosion-proof valve mounting port and covered with an explosion-proof sealing sheet.

3. The square aluminum-cased lithium-ion battery cover plate according to claim 1, characterized in that: The first limiting structure and the second limiting structure are regular hexagons.

4. A square aluminum-cased lithium-ion battery cover plate according to claim 1, characterized in that: The metal substrate has a traceability code on its front side; the lower plastic plate has an identification mark in the middle.

5. A square aluminum-cased lithium-ion battery cover plate according to claim 1, characterized in that: A first positioning boss and a second positioning boss are respectively provided on the periphery of the positive electrode mounting groove and the negative electrode mounting groove on the metal substrate. The bottom surfaces of the positive electrode insulating sleeve and the negative electrode insulating sleeve are respectively provided with a first positioning annular groove corresponding to the first positioning boss and a second positioning annular groove corresponding to the second positioning boss.

6. A square aluminum-cased lithium-ion battery cover plate according to claim 5, characterized in that: The inner walls of the first positioning boss and the second positioning boss are made into wavy surfaces.

7. A square aluminum-cased lithium-ion battery cover plate according to claim 1, characterized in that: The top surface of the positive electrode insulating sleeve is marked with a positive electrode symbol, and the top surface of the negative electrode insulating sleeve is marked with a negative electrode symbol.

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