Battery case, wound electrode core, laminated electrode core, and battery

Abstract

This invention belongs to the field of lithium-ion battery technology, and relates to a battery casing, a wound electrode core, a stacked electrode core, and a battery. It includes a casing, a rivet, an insulating sealant, and an external adapter plate. The top of the casing has a recess and a protrusion. The recess is recessed towards the bottom of the casing, and the protrusion is connected to one or both sides of the recess. The protrusion has a liquid injection hole. The external adapter plate is fixed to the protrusion. The bottom wall of the recess has a mounting hole. The insulating sealant is sealed between the wall of the mounting hole and the outer peripheral surface of the rivet. The inner end of the rivet extends into the inner cavity of the casing, and the outer end of the rivet extends into the recess, with the outer end face of the rivet not exceeding the top surface of the protrusion. The battery casing of this application has an optimized "U"-shaped top space, which increases the effective space of the casing, accommodates larger electrode cores, and effectively improves the capacity and energy density of the electrode core.

Description

Technical Field

[0001] This invention belongs to the field of lithium-ion battery technology and relates to a battery casing, a wound electrode core, a stacked electrode core, and a battery. Background Technology

[0002] Currently, lithium-ion battery steel shells on the market mainly include square steel shells and back covers. The top plane of the square steel shell has a liquid injection hole, the positive electrode of the battery and the negative electrode of the battery. The positive electrode of the battery is composed of rivets and insulating seals, and is assembled on the square steel shell through a special sealing method. The negative electrode of the battery is the square steel shell body, which is welded to the steel shell by an external adapter piece.

[0003] Compared to aluminum-plastic composite film packaging, this type of battery steel casing allows for greater punching depth, stronger pressure resistance, greater resistance to external damage, and better safety. At the same time, due to its thinner casing and higher processing precision, and the absence of the top step in aluminum-plastic composite film packaging, the effective design space for the core is increased under the same core design parameters, leading to increased core capacity and energy density.

[0004] However, the injection holes, rivets, and external adapter plates on the top of the casing still occupy some space during assembly, which limits the space utilization of the square steel casing and hinders further improvement in battery capacity and energy density. Summary of the Invention

[0005] The technical problem to be solved by the present invention is that the liquid injection hole, rivets and external adapter pieces on the top of the existing battery case still occupy part of the space during assembly, which limits the space utilization of the battery case and hinders the further improvement of battery capacity and energy density. The present invention provides a battery case, a wound electrode core, a stacked electrode core and a battery.

[0006] To address the aforementioned technical problems, this invention provides a battery casing. The battery casing includes a housing, a rivet, an insulating seal, and an external adapter plate. The top of the housing has a recess and a protrusion. The recess is recessed towards the bottom of the housing, and the protrusion is connected to one or both sides of the recess. The protrusion has an injection hole. The external adapter plate is fixed to the protrusion. The bottom wall of the recess has a mounting hole. The insulating seal is sealingly connected between the wall of the mounting hole and the outer peripheral surface of the rivet. The inner end of the rivet extends into the inner cavity of the housing, and the outer end of the rivet extends into the recess. The outer end face of the rivet does not extend beyond the top surface of the protrusion.

[0007] Optionally, the housing includes a square main housing and a rear cover plate, with an opening on one side of the square main housing and the rear cover plate fixed to the opening of the square main housing to form a sealed space between the two for accommodating the electrode core.

[0008] Optionally, the opening edge of the square main housing is provided with an outwardly extending flange, the outer edge of the rear cover plate is fitted and fixed to the flange, and the side wall of the square main housing opposite to the rear cover plate is parallel to the flange.

[0009] Optionally, the width of the flange is 2-10 mm.

[0010] Optionally, the rear cover plate is provided with a recessed portion that is recessed toward the square main housing. The recessed portion engages with the inside of the opening of the square main housing and can abut against one side surface of the pole core.

[0011] Optionally, the depth of the recess is 0.2-1 mm.

[0012] Optionally, the housing, rivets, and external adapter plates are all metal parts.

[0013] The battery casing provided in this embodiment of the invention has a recess and a protrusion on its top. The recess is recessed towards the bottom of the casing, and the protrusion is connected to one or both sides of the recess. An injection hole is provided on the protrusion, and an external adapter is fixed to the protrusion. A mounting hole is provided on the bottom wall of the recess. An insulating sealant is sealingly connected between the wall of the mounting hole and the outer peripheral surface of a rivet. The inner end of the rivet extends into the inner cavity of the casing, and the outer end of the rivet extends into the recess. The outer end face of the rivet does not extend beyond the top surface of the protrusion. In this way, the top space of the casing is optimized into a "U" shape, which can increase the effective space of the casing, accommodate larger electrode cores, and effectively improve the capacity and energy density of the electrode cores.

[0014] On the other hand, embodiments of the present invention also provide a wound electrode core, wherein the wound electrode core is provided with a recess for accommodating the inner end of a rivet of the aforementioned battery casing, the positive electrode tab of the wound electrode core is located at the bottom of the recess, and the inner end of the rivet is connected to the positive electrode tab of the wound electrode core.

[0015] On the other hand, embodiments of the present invention also provide a stacked electrode core, wherein the stacked electrode core is provided with a recess for accommodating the inner end of a rivet of the aforementioned battery casing, the positive electrode tab of the stacked electrode core is located at the bottom of the recess, and the inner end of the rivet is connected to the positive electrode tab of the stacked electrode core.

[0016] On the other hand, embodiments of the present invention also provide a battery, which includes an electrode core and the battery casing described above, wherein the electrode core is housed in the inner cavity of the battery casing, and the electrode core is the aforementioned wound electrode core or stacked electrode core. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a battery casing provided in an embodiment of the present invention;

[0018] Figure 2 This is a top view of a battery casing provided in an embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of a square main housing of a battery case provided in an embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of a stacked electrode core provided in an embodiment of the present invention;

[0021] Figure 5 This is a schematic diagram of the assembly of a stacked electrode core and a square main housing according to an embodiment of the present invention;

[0022] Figure 6 This is a schematic diagram of a wound electrode sheet provided in an embodiment of the present invention;

[0023] Figure 7 This is a schematic diagram of a stacked electrode provided in an embodiment of the present invention.

[0024] The reference numerals in the accompanying drawings are as follows:

[0025] 1. Shell; 11. Square main shell; 111. Flange; 12. Rear cover plate; 121. Recess; 13. Recess; 14. Protrusion; 141. Injection hole; 15. Inner cavity;

[0026] 2. Rivets; 3. Insulating seals; 4. External adapter plates;

[0027] 100, Stacked electrode core; 101, Positive electrode tab; 102, Negative electrode tab; 200, Winded electrode sheet; 201, Recessed area; 300, Stacked electrode sheet; 301, Recessed area. Detailed Implementation

[0028] To make the technical problems solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the invention.

[0029] like Figures 1 to 3As shown, the battery casing provided in this embodiment of the invention includes a casing 1, a rivet 2, an insulating seal 3, and an external adapter 4. The top of the casing 1 is provided with a recess 13 and a protrusion 14. The recess 13 is recessed towards the bottom of the casing 1. The protrusion 14 is connected to one or both sides of the recess 13. The protrusion 14 is provided with an injection hole 141. The external adapter 4 is fixed on the protrusion 14. The bottom wall of the recess 13 is provided with a mounting hole (not shown in the figure). The insulating seal 3 is sealed between the hole wall of the mounting hole and the outer peripheral surface of the rivet 2. The inner end of the rivet 2 extends into the inner cavity 15 of the casing 1, and the outer end of the rivet 2 extends into the recess 13. The outer end face of the rivet 2 does not extend beyond the top surface of the protrusion 14.

[0030] Specifically, the housing 1 provided by the present invention has five forms:

[0031] (1) such as Figure 2 As shown, the recess 13 is located at the center of the top of the housing 1, a liquid injection hole 141 is provided on one side of the protrusion 14, and an external adapter piece 4 is provided on the other side of the protrusion 14.

[0032] (2) In embodiments not shown, the recess 13 is located on the right edge of the top of the housing 1, and the injection hole 141 and the external adapter plate 4 are both located on the protrusion 14 on one side of the recess 13.

[0033] (3) In embodiments not shown, the recess 13 is located on the left edge of the top of the housing 1, and the injection hole 141 and the external adapter plate 4 are both located on the protrusion 14 on one side of the recess 13.

[0034] (4) In embodiments not shown, the recess 13 is located on the right side of the top of the housing 1, and the injection hole 141 and the external adapter plate 4 are both located on the protrusion 14 on the left side of the recess 13.

[0035] (5) In embodiments not shown, the recess 13 is located on the left side of the top of the housing 1, and the injection hole 141 and the external adapter plate 4 are both located on the protrusion 14 on the right side of the recess 13.

[0036] In one embodiment, the housing 1 includes a square main housing 11 and a rear cover plate 12, with an opening on one side of the square main housing 11 and the rear cover plate 12 fixed to the opening of the square main housing 11 to form a sealed space between the two for accommodating the electrode core.

[0037] In one embodiment, the opening edge of the square main housing 11 is provided with an outwardly extending flange 111, the outer edge of the rear cover plate 12 is fitted and fixed to the flange 111, and the side wall of the square main housing 11 opposite to the rear cover plate 12 is parallel to the flange 111.

[0038] In one embodiment, the width of the flange 111 is 2-10 mm.

[0039] In one embodiment, the rear cover plate 12 is provided with a recessed portion 121 that is recessed toward the square main housing 11. The recessed portion 121 is fastened to the inside of the opening of the square main housing 11 and can abut against one side surface of the pole core.

[0040] In one embodiment, the depth of the recess 121 is 0.2-1 mm.

[0041] In one embodiment, the housing 1, the rivet 2, and the external adapter plate 4 are all metal parts.

[0042] According to an embodiment of the present invention, the battery casing has a recess and a protrusion on its top. The recess is recessed towards the bottom of the casing, and the protrusion is connected to one or both sides of the recess. An injection hole is provided on the protrusion, and an external adapter is fixed to the protrusion. A mounting hole is provided on the bottom wall of the recess. An insulating sealant is sealingly connected between the wall of the mounting hole and the outer peripheral surface of the rivet. The inner end of the rivet extends into the inner cavity of the casing, and the outer end of the rivet extends into the recess. The outer end face of the rivet does not extend beyond the top surface of the protrusion. In this way, the top space of the casing is optimized into a "U" shape, which can increase the effective space of the casing, accommodate larger electrode cores, and effectively improve the capacity and energy density of the electrode cores.

[0043] In addition, one embodiment of the present invention provides a wound electrode core, wherein the wound electrode core is provided with a recess (not shown in the figure) for accommodating the inner end of the rivet 2 of the battery case of the above embodiment, the positive electrode tab of the wound electrode core is located at the bottom of the recess, and the inner end of the rivet 2 is connected to the positive electrode tab of the wound electrode core.

[0044] In one embodiment, such as Figure 6 As shown, the wound electrode core is formed by winding a wound electrode sheet 200 with multiple recesses 201. When the wound electrode sheet 200 is wound into multiple layers, the multiple recesses 201 can overlap to form pits, and the positive electrode tab connects to the pits. The negative electrode tab of the wound electrode core is welded to the square main housing 11 and then assembled through the external adapter plate 4. The wound electrode core and the battery housing cooperate with each other, which can better utilize the effective space of the housing 1, thereby improving the battery capacity and energy density.

[0045] In addition, one embodiment of the present invention also provides a stacked electrode core 100, wherein the stacked electrode core 100 is provided with a recess (not shown in the figure) for accommodating the inner end of the rivet 2 of the battery case of the above embodiment, the positive electrode tab 101 of the stacked electrode core 100 is located at the bottom of the recess, and the inner end of the rivet 2 is connected to the positive electrode tab 101 of the stacked electrode core 100.

[0046] In one embodiment, such as Figure 7 As shown, the stacked electrode core 100 is formed by stacking stacked electrode sheets 300 with recesses 301. When multiple stacked electrode sheets 300 are stacked, each recess 301 can overlap to form the recess, and the positive electrode tab 101 connects to the recess. The negative electrode tab 102 of the stacked electrode core 100 is welded to the square main housing 11 and subsequently assembled through the external adapter 4. The stacked electrode core 100 cooperates with the battery housing to better utilize the effective space of the housing 1, thereby improving the battery capacity and energy density.

[0047] The stacked electrode and the wound electrode include a plastic film, a negative electrode metal coating, a positive electrode metal coating, a negative electrode active material, a positive electrode active material, a negative electrode tab, and a positive electrode tab. The negative electrode metal coating covers the upper surface of the plastic film, the positive electrode metal coating covers the lower surface of the plastic film, the negative electrode active material is coated on the upper surface of the negative electrode metal coating, and the positive electrode active material is coated on the lower surface of the positive electrode metal coating. The negative electrode metal coating, the plastic film, and the positive electrode metal coating are stacked to form a bipolar current collector but are not conductive.

[0048] The negative electrode tab is connected to the first side edge of the negative electrode metal coating, and the positive electrode tab is connected to the second side edge of the positive electrode metal coating. The negative electrode tab and the positive electrode tab are arranged opposite to each other. A diaphragm is provided on the negative electrode metal coating or the positive electrode metal coating.

[0049] In addition, one embodiment of the present invention provides a battery, which includes an electrode core and a battery casing as described in the above embodiment. The electrode core is housed in the inner cavity of the battery casing, and the electrode core is a wound electrode core or a stacked electrode core as described above.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A battery casing, characterized in that, Includes housing, rivets, insulating seals, and external adapter plate. The top of the housing has a recess and a protrusion. The recess is recessed towards the bottom of the housing, and the protrusion is connected to one or both sides of the recess. The protrusion has a liquid injection hole. The external adapter is fixed to the protrusion. The bottom wall of the recess has a mounting hole. The insulating seal is sealed between the wall of the mounting hole and the outer peripheral surface of the rivet. The inner end of the rivet extends into the inner cavity of the housing, and the outer end of the rivet extends into the recess. The outer end face of the rivet does not extend beyond the top surface of the protrusion. The housing includes a square main housing and a rear cover plate. The square main housing has an opening on one side, and the rear cover plate is fixed to the opening of the square main housing to form a sealed space between the two for accommodating the electrode core. The rear cover plate is provided with a recessed portion that is recessed toward the square main housing. The recessed portion is fastened to the inside of the opening of the square main housing and can abut against one side surface of the pole core.

2. The battery casing according to claim 1, characterized in that, The opening edge of the square main housing is provided with an outwardly extending flange, the outer edge of the rear cover plate is fitted and fixed to the flange, and the side wall of the square main housing opposite to the rear cover plate is parallel to the flange.

3. The battery casing according to claim 2, characterized in that, The width of the flange is 2-10 mm.

4. The battery casing according to claim 1, characterized in that, The depth of the recess is 0.2-1 mm.

5. The battery casing according to claim 1, characterized in that, The housing, rivets, and external adapter plates are all metal parts.

6. A wound electrode core, characterized in that, The wound electrode core is provided with a recess for accommodating the inner end of the rivet of the battery casing according to any one of claims 1-5, the positive electrode tab of the wound electrode core is located at the bottom of the recess, and the inner end of the rivet is connected to the positive electrode tab of the wound electrode core.

7. A stacked electrode core, characterized in that, The laminated electrode core is provided with a recess for accommodating the inner end of the rivet of the battery casing according to any one of claims 1-5, the positive electrode tab of the laminated electrode core is located at the bottom of the recess, and the inner end of the rivet is connected to the positive electrode tab of the laminated electrode core.

8. A battery, characterized in that, The battery includes an electrode core and a battery casing as described in any one of claims 1-5, wherein the electrode core is housed in the inner cavity of the battery casing, and the electrode core is a wound electrode core as described in claim 6 or a stacked electrode core as described in claim 7.

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