Bipolar column battery structure and cylindrical battery

Abstract

The utility model provides a bipolar column battery structure and a cylindrical battery. The bipolar column battery structure comprises a positive electrode assembly, a negative electrode assembly, a battery cell and a shell, the shell is provided with a mounting cavity, the battery cell is mounted in the mounting cavity, the positive electrode assembly comprises a positive electrode end cover, a positive electrode column assembly, a positive electrode bus bar and a positive electrode explosion-proof valve, the positive electrode end cover covers one end of the shell, the positive electrode column assembly penetrates through the positive electrode end cover, and the positive electrode end cover covers the other end of the shell. The positive pole explosion-proof valve is mounted on the positive pole end cover; the positive pole column assembly, the positive pole confluence sheet and the battery cell are connected in sequence; the cathode assembly comprises a cathode end cover, a cathode column assembly, a cathode confluence sheet and a cathode explosion-proof valve, the cathode end cover covers the other end of the shell, the cathode column assembly penetrates through the cathode end cover, the cathode explosion-proof valve is mounted on the cathode end cover, and the anode column assembly, the cathode confluence sheet and the battery cell are sequentially connected. The positive pole assembly and the negative pole assembly are not in contact with the shell, electric leakage of the shell is avoided, the double-explosion-proof-valve design is adopted, the pressure relief speed in the battery is increased, and the safety performance is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of large cylindrical batteries, in particular to a bipolar column battery structure and a cylindrical battery. Background Art

[0002] With the rapid development of the new energy industry, the energy storage industry has also ushered in a rapid development. The market share of large cylindrical battery products has gradually increased. The large cylindrical battery structure is relatively new, and due to the large battery capacity, its safety requirements are higher.

[0003] At present, large cylindrical batteries mainly have an integrated welded aluminum shell structure. The explosion-proof valve is set at one end of the battery, and the pressure relief speed is not fast enough. Since the polar end of the battery is in contact with the aluminum shell, leakage will occur when the aluminum shell contacts the metal, resulting in safety hazards, such as the technical solution disclosed in the comparative document CN201921042245.5. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a bipolar column battery structure and a cylindrical battery.

[0005] The purpose of this utility model is achieved through the following technical solutions:

[0006] A bipolar column battery structure includes a positive electrode assembly, a negative electrode assembly, a battery cell and a shell, wherein the shell is provided with an installation cavity, and the battery cell is installed in the installation cavity.

[0007] The positive electrode assembly comprises a positive terminal cover, a positive column assembly, a positive busbar and a positive explosion-proof valve. The positive terminal cover is provided on one end of the shell, and is provided with a positive through hole, a first mounting hole and a first injection hole. The positive column assembly is passed through the positive through hole, and the positive explosion-proof valve is installed in the first mounting hole. The positive busbar is arranged in the mounting cavity, and the two ends of the positive busbar are respectively connected to the positive column assembly and one end of the battery cell;

[0008] The negative electrode assembly includes a negative terminal cover, a negative electrode column assembly, a negative busbar and a negative explosion-proof valve. The negative terminal cover is covered on the other end of the shell. The negative terminal cover is provided with a negative via hole and a second mounting hole. The negative electrode column assembly is passed through the negative via hole. The negative explosion-proof valve is mounted on the negative via hole. The negative busbar is arranged in the mounting cavity. The two ends of the negative busbar are respectively connected to the negative electrode column assembly and the other end of the battery cell.

[0009] In one embodiment, the positive electrode assembly also includes a positive electrode separator and a positive electrode grid member, the positive electrode separator is provided with a positive electrode pressure relief hole, a positive electrode isolation through hole and a second liquid injection hole, the positive electrode isolation through hole is connected to the positive via hole, one end of the positive electrode column assembly is passed through the positive electrode isolation through hole, the two ends of the positive electrode pressure relief hole are respectively connected to the mounting cavity and the first mounting hole, the number of the positive electrode grid members is multiple, and the multiple positive electrode grid members are arranged in the positive electrode isolation through hole, and the multiple positive electrode grid members divide the positive electrode isolation through hole into multiple positive connecting holes, and the second liquid injection hole is connected to the first liquid injection hole.

[0010] In one embodiment, the positive electrode column assembly includes a positive inner electrode column, a positive sealing ring, a positive outer electrode column and a positive insulating ring. The positive sealing ring is inserted into the positive isolation through hole and the positive through hole. The positive sealing ring is provided with a positive sealing through hole. The positive outer electrode column is provided with a first through hole. The positive insulating ring is provided with a second through hole. The positive sealing ring is clamped between the positive isolation sheet and the positive terminal cover. The positive insulating ring cover is provided on the positive terminal cover. The positive outer electrode column cover is provided on the positive insulating ring. The second through hole is connected to the sealing through hole. The first through hole is connected to the second through hole. One end of the positive inner electrode column abuts against the positive isolation sheet. The positive inner electrode column is sequentially inserted into the positive sealing through hole, the second through hole and the first through hole.

[0011] In one of the embodiments, a first positioning groove is provided on the side of the positive terminal cover facing away from the positive sealing ring, the first positioning groove is connected to the positive via hole, and a first positioning block is protrudingly provided on the side of the positive insulating ring facing away from the positive outer pole, and the first positioning block is embedded in the first positioning groove.

[0012] In one embodiment, the negative electrode assembly also includes a negative electrode separator and a negative electrode grid member, the negative electrode separator is provided with a negative electrode pressure relief hole and a negative electrode isolation through hole, the negative electrode isolation through hole is connected to the negative electrode through hole, one end of the negative electrode column assembly is passed through the negative electrode isolation through hole, the two ends of the negative electrode pressure relief hole are respectively connected to the mounting cavity and the second mounting hole, the number of the negative electrode grid members is multiple, and the multiple negative electrode grid members are arranged in the negative electrode isolation through hole, and the multiple negative electrode grid members divide the negative electrode isolation through hole into multiple negative electrode connecting holes.

[0013] In one embodiment, the negative electrode column assembly includes a negative electrode inner column, a negative electrode sealing ring, a negative electrode outer column and a negative electrode insulating ring. The negative electrode sealing ring is inserted into the negative electrode isolation through hole and the negative electrode through hole. The negative electrode sealing ring is provided with a negative electrode sealing through hole. The negative electrode outer column is provided with a third through hole. The negative electrode insulating ring is provided with a fourth through hole. The negative electrode sealing ring is clamped between the negative electrode isolation sheet and the negative end cover. The negative electrode insulating ring cover is provided on the negative end cover. The negative electrode outer column cover is provided on the negative electrode insulating ring. The fourth through hole is connected to the sealing through hole. The third through hole is connected to the fourth through hole. One end of the negative electrode inner column abuts against the negative electrode isolation sheet. The negative electrode inner column is sequentially inserted into the negative electrode sealing through hole, the fourth through hole and the third through hole.

[0014] In one of the embodiments, a second positioning groove is provided on the side of the negative end cover away from the negative sealing ring, the second positioning groove is connected to the negative via hole, and a second positioning block is protruding from the side of the negative insulating ring away from the negative outer pole, and the second positioning block is embedded in the second positioning groove.

[0015] In one embodiment, the positive electrode explosion-proof valve includes a positive electrode pressure relief valve body and a positive electrode protection sheet, the positive electrode pressure relief valve body is installed in the first installation hole, and the positive electrode protection sheet is installed in the positive electrode pressure relief valve body.

[0016] In one embodiment, the negative electrode explosion-proof valve includes a negative electrode pressure relief valve body and a negative electrode protection sheet, the negative electrode pressure relief valve body is installed in the second installation hole, and the negative electrode protection sheet is installed in the negative electrode pressure relief valve body.

[0017] A cylindrical battery comprises the bipolar column battery structure described in any one of the above embodiments.

[0018] Compared with the prior art, the utility model has at least the following advantages:

[0019] 1. In the above-mentioned bipolar column battery structure and cylindrical battery, the positive column assembly, the positive busbar and the battery cell are welded in sequence, and the negative column assembly, the negative busbar and the battery cell are welded in sequence, so that the shell and the positive column assembly and the negative column assembly are not in contact, so that the shell is not charged, avoiding the leakage phenomenon caused by the contact between the shell and the metal, and making it easier to weld one end of the positive column assembly and the negative column assembly with other bipolar column battery structures, reducing the risk of leakage during welding;

[0020] 2. By adopting the design of double explosion-proof valves, a positive explosion-proof valve is installed on the positive terminal cover, and a negative explosion-proof valve is installed on the negative terminal cover. When the internal pressure of the battery is too high, the positive explosion-proof valve and the negative explosion-proof valve simultaneously release pressure and dissipate heat, which speeds up the pressure relief and heat dissipation speed in the battery installation cavity, thereby improving the safety performance of the bipolar column battery structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A schematic structural diagram of a bipolar column battery structure according to an embodiment;

[0023] Figure 2 for Figure 1 A schematic diagram of the structure of the positive electrode assembly shown;

[0024] Figure 3 for Figure 2 An exploded view of the positive electrode assembly is shown;

[0025] Figure 4 for Figure 3 A schematic diagram of the structure of the positive electrode insulating ring shown;

[0026] Figure 5 for Figure 2 A cross-sectional view of the positive electrode assembly shown;

[0027] Figure 6 for Figure 1 A schematic diagram of the structure of the negative electrode assembly shown;

[0028] Figure 7 for Figure 6 An exploded view of the negative electrode assembly is shown;

[0029] Figure 8 for Figure 7 A schematic diagram of the structure of the negative electrode insulating ring shown;

[0030] Fig. 9 for Figure 6 A cross-sectional view of the negative electrode assembly is shown. DETAILED DESCRIPTION

[0031] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the relevant drawings. The drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood.

[0032] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0034] In order to better understand the technical solutions and beneficial effects of the present application, the present application is further described in detail below in conjunction with specific embodiments:

[0035] like Figure 1 As shown, a bipolar column battery structure 10 of an embodiment includes a positive electrode assembly 100, a negative electrode assembly 200, a battery cell 300 and a shell 400. The shell 400 is provided with an installation cavity 401. The battery cell 300 is installed in the installation cavity 401. The battery cell 300 is first wound, and the two ends of the battery cell 300 respectively form a positive terminal stacking connection and a negative terminal stacking connection, and then the wound battery cell 300 is loaded into the installation cavity 401.

[0036] like Figures 2 to 9As shown, further, the positive electrode assembly 100 includes a positive terminal cover 110, a positive column assembly 120, a positive busbar 130 and a positive explosion-proof valve 140, the positive terminal cover 110 is covered at one end of the shell 400, the positive terminal cover 110 is provided with a positive through hole 1101, a first mounting hole 1102 and a first injection hole 1103, the first injection hole 1103 is connected to the mounting cavity 401, and the electrolyte can be injected through the first injection hole 1103, the positive column assembly 120 is passed through the positive through hole 1101, the positive explosion-proof valve 140 is installed in the first mounting hole 1102, the positive busbar 130 is arranged in the mounting cavity 401, and the two ends of the positive busbar 130 are respectively connected to The positive terminal stacking connection of the positive electrode column assembly 120 and one end of the battery cell 300; the negative electrode assembly 200 includes a negative terminal cover 210, a negative electrode column assembly 220, a negative busbar 230 and a negative explosion-proof valve 240, the negative terminal cover 210 is covered on the other end of the shell 400, the negative terminal cover 210 is provided with a negative via 2101 and a second mounting hole 2102, the negative electrode column assembly 220 is passed through the negative via 2101, the negative explosion-proof valve 240 is installed in the second mounting hole 2102, the negative busbar 230 is arranged in the mounting cavity 401, and the two ends of the negative busbar 230 are respectively connected to the negative terminal stacking connection of the negative electrode column assembly 220 and the other end of the battery cell 300.

[0037] In this embodiment, after the battery cell 300 is wound and installed, one end of the positive busbar 130 is fixed to the positive electrode stacking surface of the battery cell 300 by laser welding, and the other end of the positive busbar 130 is welded to the positive electrode column assembly 120. One end of the negative busbar 230 is fixed to the negative electrode stacking surface of the battery cell 300 by laser welding, and the other end of the negative busbar 230 is welded to the negative electrode column assembly 220, so that the positive electrode column assembly 120 and the negative electrode column assembly 220 of the battery cell 300 are not in contact with the shell 400, so that the shell 400 is not charged; the positive explosion-proof valve 140 is installed in the positive via 1101, and the negative explosion-proof valve 240 is installed in the negative via 2101. When the internal pressure of the installation cavity 401 is too high, the positive explosion-proof valve 140 and the negative explosion-proof valve 240 are connected to the outside to release pressure and dissipate heat, so that the pressure in the installation cavity 401 is reduced.

[0038] In the above-mentioned bipolar column battery structure 10, the positive column assembly 120, the positive busbar 130 and the battery cell 300 are welded in sequence, and the negative column assembly 220, the negative busbar 230 and the battery cell 300 are welded in sequence, so that the shell 400 and the positive column assembly 120 and the negative column assembly 220 are not in contact with each other, so that the shell 400 is not charged, avoiding the leakage phenomenon caused by the contact between the shell 400 and the metal, and making the positive column assembly 120 and the negative column assembly 220 One end is more convenient to be welded with other bipolar column battery structures 10, reducing the risk of leakage during welding; by adopting the design of double explosion-proof valves, a positive explosion-proof valve 140 is installed on the positive terminal cover 110, and a negative explosion-proof valve 240 is installed on the negative terminal cover 210. When the internal pressure of the battery is too high, the positive explosion-proof valve 140 and the negative explosion-proof valve 240 simultaneously release pressure and dissipate heat, thereby accelerating the pressure relief and heat dissipation speed in the battery installation cavity 401, thereby improving the safety performance of the bipolar column battery structure 10.

[0039] like Figure 3 and Figure 5 As shown, in one embodiment, the positive electrode assembly 100 also includes a positive electrode separator 150 and a positive electrode grid member 160, the positive electrode separator 150 is provided with a positive electrode pressure relief hole 1501, a positive electrode isolation through hole 1502 and a second liquid injection hole 1503, the positive electrode isolation through hole 1502 is connected to the positive via hole 1101, one end of the positive electrode column assembly 120 is penetrated through the positive electrode isolation through hole 1502, the two ends of the positive electrode pressure relief hole 1501 are respectively connected to the mounting cavity 401 and the first mounting hole 1102, the number of positive electrode grid members 160 is multiple, and multiple positive electrode grid members 160 are arranged in the positive electrode isolation through hole 1502, and the multiple positive electrode grid members 160 divide the positive electrode isolation through hole 1602 into multiple positive connecting holes 1504, and the second liquid injection hole 1503 is connected to the first liquid injection hole 1103. In this embodiment, liquid is injected into the first injection hole 1103 during injection, and the electrolyte enters the installation cavity 401 after passing through the first injection hole 1103 and the second injection hole 1503 in sequence. The positive electrode isolation sheet 150 can isolate the electrolyte in the installation cavity 401 to avoid contact between the electrolyte and the positive terminal cover 110, thereby preventing the positive terminal cover 110 from being corroded by the electrolyte. The installation cavity 401 can be connected to the positive electrode explosion-proof valve 140 through the positive electrode pressure relief hole 1501. The multiple positive electrode grid members 160 arranged in the positive electrode pressure relief hole 1501 can block the electrolyte, thereby reducing the electrolyte from entering the first installation hole 1102 through the positive electrode connecting hole 1504 and contacting the positive electrode explosion-proof valve 140; when the internal pressure of the installation cavity 401 in the battery is too high, the positive electrode explosion-proof valve 140 is squeezed, so that the positive electrode explosion-proof valve 140 is connected to the outside to relieve pressure.

[0040] like Figure 3 and Figure 5As shown, in one embodiment, the positive electrode column assembly 120 includes a positive inner electrode column 121, a positive electrode sealing ring 122, a positive outer electrode column 123 and a positive electrode insulating ring 124, the positive electrode sealing ring 122 is inserted into the positive electrode isolation through hole 1502 and the positive electrode through hole 1101, the positive electrode sealing ring 121 is provided with a positive electrode sealing through hole 1201, the positive electrode outer electrode column 123 is provided with a first through hole 1202, the positive electrode insulating ring 124 is provided with a second through hole 1203, and the positive electrode sealing ring 121 is clamped Between the positive electrode separator 150 and the positive terminal cover 110, the positive electrode insulating ring 124 is covered on the positive terminal cover 110, the positive electrode outer pole 123 is covered on the positive electrode insulating ring 124, the second via hole 1203 is connected to the sealed via hole 1201, the first via hole 1202 is connected to the second via hole 1203, one end of the positive electrode inner pole 123 abuts against the positive electrode separator 150, and the positive electrode inner pole 123 is sequentially penetrated through the positive sealed via hole 1201, the second via hole 1203 and the first via hole 1204. In this embodiment, when the positive inner pole 121 passes through the positive sealing ring 122, the positive separator 150 and the positive terminal cover 110, the positive sealing ring 122 seals the gap between the positive inner pole 121 and the positive via 1101, so that the electrolyte in the installation cavity 401 cannot overflow from the positive via 1101, thereby increasing the sealing performance in the installation cavity 401; the positive insulating ring 124 isolates the positive terminal cover 110 from contact with the positive outer pole 123, thereby preventing The positive outer pole 123 is connected to the shell 400 through the positive terminal cover 110, and the positive outer pole 123 is in contact with the positive inner pole 121, so that the positive outer pole 123 and the positive inner pole 121 together form a positive contact terminal, which increases the contact area and welding area of ​​the positive contact terminal, facilitates the welding of the bipolar column battery structure 10, and the positive outer pole 123 is made of rust-proof aluminum of manganese-aluminum alloy, which makes the positive outer pole 123 easy to weld and has good corrosion resistance.

[0041] like Figure 3 and Figure 4 As shown, in one embodiment, a first positioning groove 1104 is provided on the side of the positive terminal cover 110 away from the positive sealing ring 122, and the first positioning groove 1104 is connected to the positive via 1101, and a first positioning block 1241 is convexly provided on the side of the positive insulating ring 124 away from the positive outer pole 123, and the first positioning block 1241 is embedded in the first positioning groove 1104. In this embodiment, the first positioning block 1241 is adapted to be embedded in the first positioning groove 1104, so that the installation position of the positive insulating ring 124 covered on the positive terminal cover 110 is fixed, so that the position of the positive outer pole 123 covered on the positive insulating ring 124 is fixed, and then the structure of each positive pole assembly 120 is the same.

[0042] like Figure 7 and Fig. 9As shown, in one embodiment, the negative electrode assembly 200 also includes a negative electrode separator 250 and a negative electrode grid member 260, the negative electrode separator 250 is provided with a negative electrode pressure relief hole 2501 and a negative electrode isolation through hole 2502, the negative electrode isolation through hole 2502 is connected to the negative electrode through hole 2101, one end of the negative electrode column assembly 220 is penetrated through the negative electrode isolation through hole 2502, the two ends of the negative electrode pressure relief hole 2501 are respectively connected to the mounting cavity 401 and the second mounting hole 2102, the number of negative electrode grid members 260 is multiple, and multiple negative electrode grid members 260 are arranged in the negative electrode isolation through hole 2502, and the multiple negative electrode grid members 260 divide the negative electrode isolation through hole 2502 into multiple negative electrode connecting holes 2503. In this embodiment, the negative electrode isolation sheet 250 can isolate the electrolyte in the installation cavity 401 to prevent the electrolyte from contacting the negative terminal cover 210, thereby extending the service life of the negative terminal cover 210; the installation cavity 401 can be connected to the negative electrode explosion-proof valve 240 through the negative electrode pressure relief hole 2501; the multiple positive electrode grid members 160 arranged in the negative electrode pressure relief hole 2501 can block the electrolyte, thereby reducing the electrolyte from entering the second installation hole 2102 through the negative electrode connecting hole 2503 and contacting the negative electrode explosion-proof valve 240; when the internal pressure of the installation cavity 401 in the battery is too high, the negative electrode explosion-proof valve 240 is squeezed, so that the negative electrode explosion-proof valve 240 is connected to the outside and the pressure is released in time.

[0043] like Figure 7 and Fig. 9As shown, in one embodiment, the negative electrode column assembly 220 includes a negative electrode inner column 221, a negative electrode sealing ring 222, a negative electrode outer column 223 and a negative electrode insulating ring 224, the negative electrode sealing ring 222 is inserted into the negative electrode isolation through hole 2502 and the negative electrode through hole 2101, the negative electrode sealing ring 222 is provided with a negative electrode sealing through hole 2201, the negative electrode outer column 223 is provided with a third through hole 2202, the negative electrode insulating ring 224 is provided with a fourth through hole 2203, and the negative electrode sealing ring 222 is clamped Between the negative electrode separator 250 and the negative end cover 210, the negative electrode insulating ring 222 is covered on the negative end cover 210, the negative electrode outer pole 223 is covered on the negative electrode insulating ring 222, the fourth through hole 2203 is connected to the sealed through hole 2201, the third through hole 2202 is connected to the fourth through hole 2203, one end of the negative electrode inner pole 221 abuts against the negative electrode separator 250, and the negative electrode inner pole 221 is sequentially penetrated through the negative electrode sealed through hole 2201, the fourth through hole 2203 and the third through hole 2202. In this embodiment, when the negative electrode inner pole 221 passes through the negative electrode sealing ring 222, the negative electrode separator 250 and the negative terminal cover 210, the negative electrode sealing ring 222 seals the gap between the negative electrode inner pole 221 and the positive electrode via 1101, so that the electrolyte in the installation cavity 401 cannot overflow from the positive electrode via 1101, thereby improving the sealing of the installation cavity 401; the negative electrode insulating ring 224 isolates the contact between the negative terminal cover 210 and the negative electrode outer pole 223, thereby preventing The negative outer pole 223 is connected to the shell 400 through the negative terminal cover 210, and the negative outer pole 223 contacts the negative inner pole 221, so that the negative outer pole 223 and the negative inner pole 2211 together form a negative contact terminal, which increases the contact area and welding area of ​​the negative contact terminal, facilitates the welding of the bipolar column battery structure 10, and the negative outer pole 223 is made of rust-proof aluminum of manganese-aluminum alloy, so that the negative outer pole 223 is easy to weld and has good corrosion resistance.

[0044] like Figure 7 and Figure 8 As shown, in one embodiment, a second positioning groove 2103 is provided on the side of the negative terminal cover 210 away from the negative sealing ring 222, and the second positioning groove 2103 is connected to the negative via 2101. A second positioning block 2241 is convexly provided on the side of the negative insulating ring 224 away from the negative outer pole 223, and the second positioning block 2241 is embedded in the second positioning groove 2103. The second positioning block 2241 is adapted to be embedded in the second positioning groove 2103, so that the installation position of the negative insulating ring 224 covered on the negative terminal cover 210 is fixed, so that the position of the negative outer pole 223 covered on the negative insulating ring 224 is fixed, and then the structure of each negative pole assembly 220 is the same.

[0045] like Figure 3As shown, in one embodiment, the positive electrode explosion-proof valve 140 includes a positive electrode pressure relief valve body 141 and a positive electrode protection sheet 142. The positive electrode pressure relief valve body 141 is installed in the first installation hole 1102, and the positive electrode protection sheet 142 is installed in the positive electrode pressure relief valve body 141. In this embodiment, when the pressure in the installation cavity 401 increases, the pressure in the positive electrode pressure relief valve body 141 connected to the installation cavity 401 increases. When the pressure exceeds a certain limit, the positive electrode protection sheet 142 is broken, so that the positive electrode pressure relief valve body 141 is connected to the outside to quickly release pressure, thereby improving the safety performance of the bipolar column battery structure 10.

[0046] like Figure 7 As shown, in one embodiment, the negative electrode explosion-proof valve 240 includes a negative electrode pressure relief valve body 241 and a negative electrode protection sheet 242. The negative electrode pressure relief valve body 241 is installed in the second installation hole 2102, and the negative electrode protection sheet 242 is installed in the negative electrode pressure relief valve body 241. In this embodiment, when the pressure in the installation cavity 401 increases, the pressure in the negative electrode pressure relief valve body 241 connected to the installation cavity 401 increases. When the pressure exceeds a certain limit, the negative electrode protection sheet 242 is broken, so that the negative electrode pressure relief valve body 241 is connected to the outside to quickly release pressure, thereby improving the safety performance of the bipolar column battery structure 10.

[0047] The present application also provides a cylindrical battery including the bipolar column battery structure 10 in any of the above embodiments. In this embodiment, the shell 400 of the cylindrical battery is not charged, which can effectively avoid leakage when the shell 400 contacts the metal, and adopts a double explosion-proof valve design of a positive electrode explosion-proof valve 140 and a negative electrode explosion-proof valve 240, so that when the internal pressure of the cylindrical battery is too high, the pressure can be quickly released and the heat can be dissipated.

[0048] Compared with the prior art, the utility model has at least the following advantages:

[0049] 1. The above-mentioned bipolar column battery structure 10 and cylindrical battery, the positive column assembly 120, the positive busbar 130 and the battery cell 300 are welded in sequence, and the negative column assembly 220, the negative busbar 230 and the battery cell 300 are welded in sequence, so that the shell 400 and the positive column assembly 120 and the negative column assembly 220 are not in contact with each other, so that the shell 400 is not charged, avoiding the leakage phenomenon caused by the contact between the shell 400 and the metal, and making it easier to weld one end of the positive column assembly 120 and the negative column assembly 220 with other bipolar column battery structures 10, reducing the risk of leakage during welding;

[0050] 2. By adopting a double explosion-proof valve design, a positive explosion-proof valve 140 is installed on the positive terminal cover 110, and a negative explosion-proof valve 240 is installed on the negative terminal cover 210. When the internal pressure of the battery is too high, the positive explosion-proof valve 140 and the negative explosion-proof valve 240 simultaneously release pressure and dissipate heat, which speeds up the pressure relief and heat dissipation speed in the battery installation cavity 401, thereby improving the safety performance of the bipolar column battery structure 10.

[0051] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A bipolar column battery structure, characterized in that: It includes a positive electrode assembly, a negative electrode assembly, a battery cell and a shell, wherein the shell is provided with an installation cavity, and the battery cell is installed in the installation cavity. The positive electrode assembly comprises a positive terminal cover, a positive column assembly, a positive busbar and a positive explosion-proof valve. The positive terminal cover is provided on one end of the shell, and is provided with a positive through hole, a first mounting hole and a first injection hole. The positive column assembly is passed through the positive through hole, and the positive explosion-proof valve is installed in the first mounting hole. The positive busbar is arranged in the mounting cavity, and the two ends of the positive busbar are respectively connected to the positive column assembly and one end of the battery cell; The negative electrode assembly includes a negative terminal cover, a negative electrode column assembly, a negative busbar and a negative explosion-proof valve. The negative terminal cover is covered on the other end of the shell. The negative terminal cover is provided with a negative via hole and a second mounting hole. The negative electrode column assembly is passed through the negative via hole. The negative explosion-proof valve is mounted on the negative via hole. The negative busbar is arranged in the mounting cavity. The two ends of the negative busbar are respectively connected to the negative electrode column assembly and the other end of the battery cell.

2. The bipolar column battery structure according to claim 1, characterized in that: The positive electrode assembly also includes a positive electrode separator and a positive electrode grid member. The positive electrode separator is provided with a positive electrode pressure relief hole, a positive electrode isolation through hole and a second liquid injection hole. The positive electrode isolation through hole is connected to the positive via hole. One end of the positive electrode column assembly is passed through the positive electrode isolation through hole. The two ends of the positive electrode pressure relief hole are respectively connected to the mounting cavity and the first mounting hole. There are multiple positive electrode grid members, and multiple positive electrode grid members are arranged in the positive electrode isolation through hole. The multiple positive electrode grid members divide the positive electrode isolation through hole into multiple positive connecting holes, and the second liquid injection hole is connected to the first liquid injection hole.

3. The bipolar column battery structure according to claim 2, characterized in that: The positive electrode column assembly includes a positive inner electrode column, a positive sealing ring, a positive outer electrode column and a positive insulating ring. The positive sealing ring is inserted into the positive isolation through hole and the positive through hole. The positive sealing ring is provided with a positive sealing through hole. The positive outer electrode column is provided with a first through hole. The positive insulating ring is provided with a second through hole. The positive sealing ring is clamped between the positive isolation sheet and the positive terminal cover. The positive insulating ring cover is provided on the positive terminal cover. The positive outer electrode column cover is provided on the positive insulating ring. The second through hole is connected to the sealing through hole. The first through hole is connected to the second through hole. One end of the positive inner electrode column abuts against the positive isolation sheet. The positive inner electrode column is sequentially inserted into the positive sealing through hole, the second through hole and the first through hole.

4. The bipolar column battery structure according to claim 3, characterized in that: A first positioning groove is provided on the side of the positive terminal cover away from the positive sealing ring, and the first positioning groove is connected to the positive via hole. A first positioning block is protruding from the side of the positive insulating ring away from the positive outer pole, and the first positioning block is embedded in the first positioning groove.

5. The bipolar column battery structure according to claim 1, characterized in that: The negative electrode assembly also includes a negative electrode separator and a negative electrode grid member. The negative electrode separator is provided with a negative electrode pressure relief hole and a negative electrode isolation through hole. The negative electrode isolation through hole is connected to the negative electrode through hole. One end of the negative electrode column assembly is passed through the negative electrode isolation through hole. The two ends of the negative electrode pressure relief hole are respectively connected to the mounting cavity and the second mounting hole. There are multiple negative electrode grid members. Multiple negative electrode grid members are arranged in the negative electrode isolation through hole. Multiple negative electrode grid members divide the negative electrode isolation through hole into multiple negative electrode connecting holes.

6. The bipolar column battery structure according to claim 5, characterized in that: The negative electrode column assembly includes a negative electrode inner column, a negative electrode sealing ring, a negative electrode outer column and a negative electrode insulating ring. The negative electrode sealing ring is inserted into the negative electrode isolation through hole and the negative electrode through hole. The negative electrode sealing ring is provided with a negative electrode sealing through hole. The negative electrode outer column is provided with a third through hole. The negative electrode insulating ring is provided with a fourth through hole. The negative electrode sealing ring is clamped between the negative electrode isolation sheet and the negative end cover. The negative electrode insulating ring cover is provided on the negative end cover. The negative electrode outer column cover is provided on the negative electrode insulating ring. The fourth through hole is connected to the sealing through hole. The third through hole is connected to the fourth through hole. One end of the negative electrode inner column abuts against the negative electrode isolation sheet. The negative electrode inner column is sequentially inserted into the negative electrode sealing through hole, the fourth through hole and the third through hole.

7. The bipolar column battery structure according to claim 6, characterized in that: A second positioning groove is provided on the side of the negative terminal cover away from the negative sealing ring, and the second positioning groove is connected to the negative via hole. A second positioning block is protruding from the side of the negative insulating ring away from the negative outer pole, and the second positioning block is embedded in the second positioning groove.

8. The bipolar column battery structure according to claim 1, characterized in that: The positive electrode explosion-proof valve comprises a positive electrode pressure relief valve body and a positive electrode protection sheet. The positive electrode pressure relief valve body is installed in the first installation hole, and the positive electrode protection sheet is installed in the positive electrode pressure relief valve body.

9. The bipolar column battery structure according to claim 1, characterized in that: The negative electrode explosion-proof valve comprises a negative electrode pressure relief valve body and a negative electrode protection sheet. The negative electrode pressure relief valve body is installed in the second installation hole, and the negative electrode protection sheet is installed in the negative electrode pressure relief valve body.

10. A cylindrical battery, characterized in that: A bipolar column battery structure comprising any one of claims 1 to 9.

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