Steel-cased batteries

Abstract

This utility model discloses a steel-cased battery, including a casing and a lead-out electrode assembly. The casing includes a bottom shell and a cover plate, which together form an inner cavity. A bare battery cell is arranged in the inner cavity, and each bare battery cell has a first electrode and a second electrode with opposite polarities. The bottom shell has at least one first through hole, corresponding to either the first or second electrode. The lead-out electrode assembly is arranged on the first through hole and includes a sealing ring and lead-out electrode pieces. The sealing ring has a connecting hole; one side of the sealing ring is bonded to the bottom shell, and the other side is bonded to the lead-out electrode pieces. The lead-out electrode pieces are electrically connected to the first or second electrode through the connecting hole. This steel-cased battery reduces the installation space required for the lead-out electrodes, helps to increase the battery's energy density, enhances sealing performance, and improves battery reliability.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a steel-cased battery. Background Technology

[0002] Steel-cased batteries typically have positive and negative leads to connect to the positive and negative plates of the bare cells. Currently, the positive and negative leads are mainly installed on the casing by riveting. However, riveting requires a large installation space, which occupies the installation space of the bare cells, resulting in a reduction in the size of the bare cells and a decrease in the energy density of the battery. In addition, there are rubber gaskets pressed between the positive and negative leads and the casing. Over time, the rubber gaskets are prone to creep, which can lead to battery seal failure and affect the reliability of the battery. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a steel-cased battery, which helps to improve the battery's energy density and reliability.

[0004] A steel-cased battery according to a first aspect of the present invention includes a casing and an electrode assembly. The casing includes a bottom shell and a cover plate, the bottom shell and the cover plate forming an inner cavity. A bare battery cell is arranged in the inner cavity. The bare battery cell is provided with a first electrode and a second electrode with opposite polarities. The bottom shell has at least one first through hole, the first through hole corresponding to the first electrode or the second electrode. The electrode assembly is arranged on the first through hole, and the electrode assembly corresponds one-to-one with the first through hole. The electrode assembly includes a sealing ring and an electrode sheet. The sealing ring has a connecting hole. One side of the sealing ring is bonded to the bottom shell, and the other side of the sealing ring is bonded to the electrode sheet. The electrode sheet is electrically connected to the first electrode or the second electrode through the connecting hole.

[0005] The steel-cased battery according to this utility model embodiment has at least the following beneficial effects: The bottom shell and cover plate form an inner cavity, in which the bare battery cell is arranged. The bottom shell has two first through holes, and the lead-out electrode assembly corresponds to the first through holes. One side of the sealing ring is bonded to the bottom shell, and the other side of the sealing ring is bonded to the lead-out electrode sheet. The first or second electrode sheet of the bare battery cell passes through the first through holes and the connecting hole in sequence and is electrically connected to the lead-out electrode sheet. By setting the sealing ring to install the lead-out electrode sheet on the shell, not only can the installation space required for the lead-out electrode assembly be reduced, and the volume occupied in the inner cavity be reduced, but the volume of the bare battery cell can also be increased, thus improving the energy density of the steel-cased battery. Furthermore, the bottom shell and the lead-out electrode sheet are bonded to both sides of the sealing ring respectively, which can improve the sealing performance between the shell and the lead-out electrode sheet, avoid sealing failure caused by creep of the sealing ring, and improve the reliability of the battery.

[0006] According to some embodiments of the present invention, a boss is provided on one side of the lead-out electrode sheet, and the boss passes through the connecting hole.

[0007] According to some embodiments of the present invention, the bottom shell is fixedly connected to a flange ring, the flange ring is arranged on the first through hole, the flange ring has a second through hole, the side of the sealing ring away from the lead-out electrode sheet is bonded to the flange ring, and the connecting hole communicates with the second through hole.

[0008] According to some embodiments of the present invention, the sealing ring is located inside the first through hole, and the outer dimensions of the sealing ring are larger than the outer dimensions of the lead-out electrode sheet.

[0009] According to some embodiments of the present invention, the flange ring is arranged on the inner or outer side of the bottom shell sidewall.

[0010] According to some embodiments of the present invention, the outer dimensions of the cover plate are larger than the outer dimensions of the bottom shell along the circumferential direction of the cover plate.

[0011] According to some embodiments of the present invention, the cover plate has a stepped portion protruding from the side near the bottom shell, the stepped portion extends into the bottom shell, and the side wall of the stepped portion abuts against the side wall of the bottom shell.

[0012] According to some embodiments of the present invention, the cover plate and the stepped portion are separately provided, and the cover plate and the stepped portion are fixedly connected.

[0013] According to some embodiments of the present invention, the cover plate has a third through hole, which is located in the middle of the cover plate.

[0014] According to some embodiments of the present invention, the bottom shell has an injection hole that communicates with the inner cavity, and a sealing plate is fixedly connected to the injection hole, the sealing plate being used to block the injection hole.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0017] Figure 1 This is a schematic diagram of a steel-cased battery according to an embodiment of the present invention;

[0018] Figure 2 This is an exploded view of the steel-cased battery according to an embodiment of the present invention. Figure 1 ;

[0019] Figure 3 This is an exploded view of the steel-cased battery according to an embodiment of the present invention. Figure 2 ;

[0020] Figure 4 This is a schematic diagram of the installation of the lead electrode assembly of the steel-cased battery according to an embodiment of the present invention. Figure 1 ;

[0021] Figure 5 This is a schematic diagram of the installation of the lead electrode assembly of the steel-cased battery according to an embodiment of the present invention. Figure 2 ;

[0022] Figure 6 This is a schematic diagram of the installation of the lead electrode assembly of the steel-cased battery according to an embodiment of the present invention. Figure 3 ;

[0023] Figure 7 This is a schematic diagram of the installation of the lead electrode assembly of the steel-cased battery according to an embodiment of the present invention. Figure 4 ;

[0024] Figure 8 A schematic diagram of the cover plate of the steel-cased battery according to an embodiment of this utility model. Figure 1 ;

[0025] Figure 9 A schematic diagram of the cover plate of the steel-cased battery according to an embodiment of this utility model. Figure 2 .

[0026] Figure label:

[0027] Housing 100, bottom shell 110, first through hole 111, flange ring 112, second through hole 113, liquid injection hole 114, sealing plate 115, cover plate 120, stepped part 121, third through hole 122, inner cavity 130, bare cell 140, first electrode 141, second electrode 142;

[0028] Lead-out electrode assembly 200, sealing ring 210, connecting hole 211, lead-out electrode piece 220, boss 221. Detailed Implementation

[0029] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0030] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0032] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0033] In related technologies, steel-cased batteries are typically equipped with positive and negative leads to facilitate connection to the positive and negative electrode plates of the bare battery cell.

[0034] First, the existing installation method for positive and negative leads mainly involves arranging the leads and the pads sequentially on the housing, and then fixing them to the housing by riveting. However, the riveting structure requires a large installation space, which occupies the installation space of the bare cell, resulting in a reduction in the volume of the bare cell and a decrease in the energy density of the battery.

[0035] Secondly, because the rubber gasket is pressed onto the casing by a riveting structure, the sealing effect between the rubber gasket and the casing is poor. Moreover, the rubber gasket is prone to creep after long-term use, which leads to battery seal failure and affects battery reliability.

[0036] Therefore, this utility model proposes a steel-cased battery, which can reduce the installation space required for the lead-out electrodes, help improve the energy density of the battery, and enhance the sealing performance and reliability of the battery.

[0037] Understandably, referring to Figures 1 to 4The steel-cased battery of this utility model includes a casing 100 and an electrode assembly 200. The casing 100 includes a bottom shell 110 and a cover plate 120, which together form an inner cavity 130. A bare cell 140 is arranged in the inner cavity 130. The bare cell 140 is provided with a first electrode 141 and a second electrode 142 of opposite polarity. The bottom shell 110 has at least one first through hole 111, which corresponds to the first electrode 141 or the second electrode 142 of opposite polarity. Diode 142; Lead-out electrode assembly 200 is arranged on the first through hole 111. Lead-out electrode assembly 200 includes a sealing ring 210 and a lead-out electrode sheet 220. The sealing ring 210 has a connecting hole 211. One side of the sealing ring 210 is bonded to the bottom shell 110, and the other side of the sealing ring 210 is bonded to the lead-out electrode sheet 220. The lead-out electrode sheet 220 is electrically connected to the first electrode 141 or the second electrode 142 through the connecting hole 211.

[0038] The bottom shell 110 and the cover plate 120 form an inner cavity 130. The bare battery cell 140 is arranged in the inner cavity 130. The bottom shell 110 has at least one first through hole 111. The lead-out electrode group 200 corresponds to the first through hole 111. One side of the sealing ring 210 is bonded to the bottom shell 110, and the other side of the sealing ring 210 is bonded to the lead-out electrode piece 220. The first electrode piece 141 or the second electrode piece 142 of the bare battery cell 140 passes through the first through hole 111 and the connecting hole 211 in sequence and is electrically connected to the lead-out electrode piece 220.

[0039] By installing the lead electrode 220 on the housing 100 using a sealing ring 210, the installation space required for the lead electrode assembly 200 can be reduced, the volume occupied by the inner cavity 130 can be reduced, and the volume of the bare cell 140 can be increased, thereby improving the energy density of the steel-cased battery.

[0040] In addition, the bottom shell 110 and the lead electrode plate 220 are respectively bonded to both sides of the sealing ring 210, so that the bottom shell 110 and the lead electrode plate 220 can maintain a seal, which can improve the sealing performance between the shell 100 and the lead electrode plate 220, avoid the sealing ring 210 from creeping and causing sealing failure, and improve the reliability of the battery.

[0041] It should be noted that the sealing ring 210 can be made of maleic anhydride-modified polypropylene, polyethylene, etc., and is not limited here. By thermally bonding the sealing ring 210 between the bottom shell 110 and the lead electrode 220, the position of the sealing ring 210 can be kept stable, thereby improving the connection stability between the sealing ring 210 and the bottom shell 110, and between the sealing ring 210 and the lead electrode 220, and improving the reliability of the steel-cased battery.

[0042] Understandably, referring to Figure 2The sealing ring 210 is bonded to the bottom shell 110. When the battery accidentally causes the internal temperature to rise, the sealing ring 210 can be heated and melted and separated from the bottom shell 110, so that the pressure in the inner cavity 130 can be released through the first through hole 111, thereby reducing the possibility of battery explosion and improving the reliability of steel-cased battery.

[0043] Specifically, refer to Figure 3 When the number of the first through hole 111 and the number of lead-out electrode groups 200 are both set to one, the first through hole 111 and the lead-out electrode groups 200 are both corresponding to the first electrode 141 of the bare cell 140, so that the first electrode 141 of the bare cell 140 is electrically connected to the lead-out electrode group 200 and the second electrode 142 of the bare cell 140 is electrically connected to the housing 100.

[0044] Reference Figure 2 When the number of first through holes 111 and lead-out electrode groups 200 is both set to two, the two first through holes 111 correspond to the first electrode 141 and the second electrode 142 of the bare cell 140, respectively. The first electrode 141 and the second electrode 142 are electrically connected through the two lead-out electrode groups 200, so that the two lead-out electrode groups 200 are separated from the housing 100, the distance between the two lead-out electrode groups 200 is extended, the possibility of accidental short circuit is reduced, which is helpful for battery processing and manufacturing and improves the convenience of processing.

[0045] Understandably, referring to Figure 2 and Figure 5 A boss 221 is provided on one side of the lead electrode 220, and the boss 221 passes through the connection hole 211. The boss 221 is arranged on one side of the lead electrode 220. By providing the boss 221 to pass through the connection hole 211, it is convenient to connect the first electrode 141 or the second electrode 142, which makes it easier to shorten the length of the first electrode 141 and the second electrode 142, and helps to increase the volume of the bare cell 140 and improve the energy density.

[0046] Specifically, refer to Figure 2 and Figure 6 A flange ring 112 is fixedly connected to the bottom shell 110. The flange ring 112 is arranged on the first through hole 111 and has a second through hole 113. The side of the sealing ring 210 away from the lead-out electrode 220 is bonded to the flange ring 112. The connecting hole 211 communicates with the second through hole 113. By setting the flange ring 112 to be fixedly connected to the bottom shell 110 and bonding the sealing ring 210 to the flange ring 112, the lead-out electrode assembly 200 can be easily assembled onto the housing 100, so that the first electrode 141 or the second electrode 142 can pass through the second through hole 113 and the connecting hole 211 in sequence and be electrically connected to the boss 221, thereby improving the convenience of processing.

[0047] It should be noted that before the sealing ring 210 is bonded to the flange ring 112, the flange ring 112 needs to be passivated to enhance the bonding performance between the sealing ring 210 and the flange ring 112. By bonding the flange ring 112 to the sealing ring 210, the entire bottom shell 110 can be passivated instead of being passivated. This not only improves processing efficiency but also reduces the amount of chemical raw materials required for passivation, thus lowering processing costs.

[0048] The flange ring 112 can be fixed to the bottom shell 110 by welding, gluing, or other methods, which are not limited here.

[0049] Specifically, refer to Figure 2 and Figure 6 The sealing ring 210 is located inside the first through hole 111, and the outer dimensions of the sealing ring 210 are larger than the outer dimensions of the lead-out electrode sheet 220. By setting the sealing ring 210 inside the first through hole 111, the space in the depth direction of the first through hole 111 is fully utilized, making the overall structure of the lead-out electrode assembly 200 more compact and avoiding occupying the space of the inner cavity 130.

[0050] In addition, the outer dimensions of the sealing ring 210 are larger than the outer dimensions of the lead electrode 220, so that the lead electrode 220 can always be located within the projection plane of the sealing ring 210. This can prevent the lead electrode 220 from contacting the inner wall of the first through hole 111 and prevent the two lead electrode 220 from short-circuiting through the housing 100, which helps to improve the reliability of the battery.

[0051] Specifically, refer to Figure 6 and Figure 7 The flange ring 112 is arranged on the inner or outer side of the side wall of the bottom shell 110. The flange ring 112 can be arranged on the inner or outer side of the side wall of the bottom shell 110, which can enhance the installation flexibility of the flange ring 112 and adapt to different battery installation requirements.

[0052] Reference Figure 6 When the flange ring 112 is arranged on the inner side of the side wall of the bottom shell 110, the flange ring 112 is bonded to one side of the sealing ring 210, and the lead-out electrode plate 220 is bonded to the other side. The lead-out electrode plate 220 faces outwards from the shell 100, and the boss 221 faces inwards from the shell 100, making the outer perimeter of the shell 100 smoother, facilitating the installation and arrangement of the steel-cased battery, and improving ease of use.

[0053] Reference Figure 7When the flange ring 112 is positioned on the outer side of the sidewall of the bottom shell 110, the flange ring 112 is bonded to one side of the sealing ring 210, and the lead-out electrode plate 220 is bonded to the other side. The lead-out electrode plate 220 faces the inner side of the shell 100, and the boss 221 faces the outer side of the shell 100. This avoids the flange ring 112 occupying space in the inner cavity 130, helps to increase the volume of the bare cell 140, and improves the energy density of the battery.

[0054] Understandably, referring to Figure 1 Along the circumference of the cover plate 120, the outer dimension of the cover plate 120 is larger than the outer dimension of the bottom shell 110. By setting the outer dimension of the cover plate 120 to be larger than the outer dimension of the bottom shell 110, the cover plate 120 can protrude from the edge of the bottom shell 110, thereby facilitating the fixed installation of the bottom shell 110 and the cover plate 120 together and improving the sealing performance.

[0055] It should be noted that the bottom shell 110 and the cover plate 120 are fixedly connected together by welding. By setting the outer dimensions of the cover plate 120 to be larger than those of the bottom shell 110, it is convenient to weld the bottom shell 110 and the cover plate 120 together. This also avoids the positional misalignment of the bottom shell 110 and the cover plate 120 during welding, which would cause welding slag to splash into the inner cavity 130, thereby improving the yield of the battery.

[0056] In addition, the larger outer dimensions of the cover plate 120 can disperse external impacts, reduce the possibility of external forces acting directly on the bottom shell 110, reduce the risk of deformation, sealing failure or even internal short circuits caused by external impacts, and ensure the safe operation of the battery.

[0057] Understandably, referring to Figure 2 and Figure 8 A stepped portion 121 protrudes from the side of the cover plate 120 near the bottom shell 110, extending into the bottom shell 110, and the sidewall of the stepped portion 121 abuts against the sidewall of the bottom shell 110. The stepped portion 121 is positioned on the side of the cover plate 120 near the bottom shell 110. By abutting against the sidewall of the bottom shell 110, the stepped portion 121 can seal the bottom shell 110, enhancing the sealing of the inner cavity 130 and preventing weld slag from splashing into the inner cavity 130 during welding of the bottom shell 110 and the cover plate 120, thereby improving the battery yield.

[0058] In addition, the side wall of the stepped portion 121 abuts against the side wall of the bottom shell 110 so that the stepped portion 121 can position the bottom shell 110, prevent the side wall of the bottom shell 110 from bending and deforming, stabilize the structure of the shell 100, and improve the reliability of the battery.

[0059] Specifically, the outer dimensions of the cover plate 120 are the same as those of the bottom shell 110, so that the outer contour of the shell 100 is flat, which facilitates the installation and arrangement of the steel shell battery and improves the convenience of use.

[0060] Specifically, refer to Figure 2 and Figure 9 The cover plate 120 and the stepped portion 121 are separate components, but are fixedly connected. By making the cover plate 120 and the stepped portion 121 separate components, it is easier to process and manufacture, reduces processing difficulty, helps to improve yield, and reduces processing costs.

[0061] It should be noted that, due to the small thickness of the cover plate 120 and the small distance between the side wall of the cover plate 120 and the side wall of the stepped portion 121, the processing of the cover plate 120 is difficult. By setting the cover plate 120 and the stepped portion 121 as separate parts, the step portion 121 can be formed by cutting and machining the cover plate 120 instead of the step portion 121, thus reducing the processing difficulty and improving the yield.

[0062] The cover plate 120 and the stepped portion 121 can be fixedly connected together by means of adhesive, welding or other methods, which will not be described in detail here.

[0063] Specifically, refer to Figure 2 and Figure 9 The cover plate 120 has a third through hole 122, which is located in the middle of the cover plate 120. By opening the third through hole 122 on the cover plate 120, the cover plate 120 and the stepped part 121 can be easily welded together, which facilitates the processing operation and improves the convenience of processing.

[0064] In addition, by opening a third through hole 122 on the cover plate 120, the weight of the cover plate 120 can be reduced, thereby reducing the overall weight of the steel-cased battery and improving the performance of the steel-cased battery.

[0065] Understandably, referring to Figure 1 and Figure 2 The bottom shell 110 has an injection hole 114 that communicates with the inner cavity 130. A sealing plate 115 is fixedly connected to the injection hole 114, and the sealing plate 115 is used to seal the injection hole 114. The injection hole 114 in the bottom shell 110 communicates with the inner cavity 130, which allows electrolyte to be easily injected into the inner cavity 130 through the injection hole 114. After the injection is completed, the sealing plate 115 seals the injection hole 114 to prevent external air, moisture and other impurities from entering the battery, avoid electrolyte leakage, and thus ensure the stability of the inner cavity 130.

[0066] It should be noted that the sealing sheet 115 can be fixed to the bottom shell 110 by welding, gluing, or other methods, which will not be described in detail here.

[0067] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A steel-cased battery, characterized in that, include: The housing includes a bottom shell and a cover plate, the bottom shell and the cover plate forming an inner cavity, the inner cavity being arranged with bare cells, the bare cells being provided with a first electrode and a second electrode with opposite polarities, the bottom shell having at least one first through hole, the first through hole corresponding to the first electrode or the second electrode; The electrode assembly is arranged on the first through hole. The electrode assembly includes a sealing ring and an electrode sheet. The sealing ring has a connecting hole. One side of the sealing ring is bonded to the bottom shell, and the other side of the sealing ring is bonded to the electrode sheet. The electrode sheet is electrically connected to the first electrode or the second electrode through the connecting hole.

2. The steel-cased battery according to claim 1, characterized in that, A boss is provided on one side of the lead-out electrode plate, and the boss passes through the connection hole.

3. The steel-cased battery according to claim 2, characterized in that, The bottom shell is fixedly connected to a flange ring, which is arranged on the first through hole. The flange ring has a second through hole. The side of the sealing ring away from the lead-out electrode plate is bonded to the flange ring. The connecting hole communicates with the second through hole.

4. The steel-cased battery according to claim 3, characterized in that, The sealing ring is located inside the first through hole, and the outer dimensions of the sealing ring are larger than the outer dimensions of the lead-out electrode sheet.

5. The steel-cased battery according to claim 3, characterized in that, The flange ring is arranged on the inner or outer side of the bottom shell sidewall.

6. The steel-cased battery according to claim 1, characterized in that, Along the circumferential direction of the cover plate, the outer dimensions of the cover plate are larger than the outer dimensions of the bottom shell.

7. The steel-cased battery according to claim 1, characterized in that, The cover plate has a stepped portion protruding from the side near the bottom shell. The stepped portion extends into the bottom shell, and the side wall of the stepped portion abuts against the side wall of the bottom shell.

8. The steel-cased battery according to claim 7, characterized in that, The cover plate and the stepped portion are separate components, and the cover plate and the stepped portion are fixedly connected.

9. The steel-cased battery according to claim 8, characterized in that, The cover plate has a third through hole, which is located in the middle of the cover plate.

10. The steel-cased battery according to claim 1, characterized in that, The bottom shell has an injection hole that communicates with the inner cavity. A sealing plate is fixedly connected to the injection hole, and the sealing plate is used to block the injection hole.

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