Quadrangular prism type battery and battery device
By adopting a steel shell design in the battery, the non-adhesive insulation layer is removed and the core rolling group is reinforced with an insulating belt, the problem of slow heat dissipation speed and easy scratches of the core rolling group is solved, and higher heat dissipation is achieved Efficiency and safety.
Patent Information
- Application Number
- CN202421058120.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-15
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-05-15
AI Technical Summary
The heat dissipation speed of the core rolling group in the existing batteries is slow, which affects the overall performance of the battery. After removing the Maila film, the core rolling group is easily scratched by the battery shell, resulting in short circuits and other problems.
The quadrupole type battery design is adopted, and the battery shell is a steel shell. The non-adhesive insulation layer between the core rolling group and the battery shell is removed, and the insulating belt is added to reinforce the core rolling group, and the insulating belt is adjusted. The size ratio of the connection end faces is to improve thermal conductivity and protect the core set.
The heat dissipation speed of the core rolling group is improved, the risk of the core rolling group being scratched by the battery shell is reduced, and the safety and stability of the battery is enhanced.
Smart Images
Figure CN222463114U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, in particular to a quadrangular prism battery and a battery device. Background Art
[0002] In the related art, the battery includes a battery housing and a core pack, and the surface of the core pack is wrapped with a Mylar film to protect the core pack. However, the Mylar film is relatively thick, which affects the heat dissipation speed of the core pack to the battery housing.
[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content
[0004] The utility model provides a quadrangular prism battery, which can solve the technical problem of slow heat dissipation speed of a winding core group.
[0005] The quadrangular prism battery includes:
[0006] Battery shell, the battery shell is a steel shell;
[0007] A core assembly is at least partially located in the battery housing, and no non-adhesive insulating layer is provided between the core assembly and the battery housing, and the core assembly includes one or more cores;
[0008] At least one insulating band, the insulating band being bonded to two opposite end surfaces of the winding core assembly and to a connecting end surface between the two opposite end surfaces;
[0009] Among them, in the insulating tightening band and the connecting end face where the insulating tightening band is located, the ratio of the size of the insulating tightening band in the length direction of the connecting end face to the size of the connecting end face in the length direction thereof is 0.05-0.7.
[0010] On the one hand, the utility model sets the battery shell as a steel shell. Since the steel shell is not easy to corrode, the utility model can remove the non-adhesive insulating layer such as the Mylar film between the core group and the battery shell while satisfying the protection effect of the core group, so as to improve the heat conduction speed between the core group and the battery shell and the space utilization rate of the battery shell; on the other hand, after the battery removes the non-adhesive insulating layer such as the Mylar film, the core group is relatively loose. During the process of assembling the core group into the battery shell, the battery shell may scratch the core group, thereby causing problems such as short circuit of the core group. The utility model reinforces the core group by an insulating tightening belt, thereby reducing the risk of the core group being scratched by the battery shell when the core group enters the battery shell; On the other hand, the ratio of the size of the insulating strap in the length direction of the connecting end face to the size of the connecting end face in its length direction is too small, and the reinforcing effect of the insulating strap on the core group is not obvious. The ratio of the size of the insulating strap in the length direction of the connecting end face to the size of the connecting end face in its length direction is too large, and the influence of the insulating strap on the heat conduction rate between the core group and the battery shell is too large. The utility model sets the ratio of the size of the insulating strap in the length direction of the connecting end face to the size of the connecting end face in its length direction to an appropriate size. This setting can not only ensure the reinforcing effect of the insulating strap on the core group, but also reduce the influence of the insulating strap on the heat conduction rate between the core group and the battery shell.
[0011] The utility model also provides a battery device, which includes the above-mentioned quadrangular prism battery. The winding core group in the battery has a higher heat dissipation speed, and the winding core group is not easily damaged by the battery shell, so that the battery device also has good safety and stability.
[0012] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] In order to better understand the present disclosure, reference may be made to the embodiments shown in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, related elements or components may have different arrangements as known in the art. In addition, in the drawings, the same reference numerals represent the same or similar components in each drawing.
[0014] in:
[0015] Figure 1 It is a schematic structural diagram of an exemplary embodiment of a quadrangular prism battery disclosed in the present invention;
[0016] Figure 2 for Figure 1 A cross-sectional view of the quadrangular prism-shaped battery along the dashed line AA;
[0017] Figure 3 It is a schematic structural diagram of a core pack in an exemplary embodiment of a quadrangular prism battery disclosed in the present invention;
[0018] Figure 4 A schematic structural diagram of a core pack in an exemplary embodiment of a quadrangular prism battery disclosed herein from another perspective;
[0019] Figure 5 A bottom view of a core pack in an exemplary embodiment of a quadrangular prism battery disclosed herein;
[0020] Figure 6 A side view of a core pack in an exemplary embodiment of a quadrangular prism battery of the present disclosure;
[0021] Figure 7 for Figure 4 An enlarged view of a local area BB of the winding core group is shown.
[0022] Description of reference numerals:
[0023] 1. Battery case; 2. Winding core assembly; 21. Winding core; 3. Insulating band; 31. First insulating band; 32. Second insulating band; 41. Open end face; 42. Corner end face; 5. Tab; 6. Liquid injection hole. DETAILED DESCRIPTION
[0024] The following will be combined with the accompanying drawings in the exemplary embodiments of the present disclosure to clearly and completely describe the technical solutions in the exemplary embodiments of the present disclosure. The exemplary embodiments described herein are only for illustrative purposes and are not intended to limit the scope of protection of the present disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of the present disclosure.
[0025] In the description of the present disclosure, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more; the term "and / or" includes any and all combinations of one or more associated listed items. In particular, reference to "the / the" object or "an" object is also intended to indicate one of a possible plurality of such objects.
[0026] Unless otherwise specified or explained, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.
[0027] Further, in the description of the present disclosure, it should be understood that the directional words such as "upper", "lower", "inner", "outer" and the like described in the exemplary embodiments of the present disclosure are described at the angles shown in the accompanying drawings and should not be understood as limitations on the exemplary embodiments of the present disclosure. It should also be understood that, in the context, when it is mentioned that an element or feature is connected to one or more "upper", "lower", or "inner", "outer" of another element, it can not only be directly connected to the "upper", "lower", "inner", "outer" of another element or elements, but can also be indirectly connected to the "upper", "lower", "inner", "outer" of another element or elements through an intermediate element.
[0028] This exemplary embodiment provides a battery such as Figure 1-6 As shown, Figure 1 This is a schematic structural diagram of an exemplary embodiment of a quadrangular prism battery disclosed in the present invention. Figure 2 for Figure 1 The cross-sectional view of the quadrangular prism type battery along the dotted line AA is shown. Figure 3 This is a schematic structural diagram of a core pack 2 in an exemplary embodiment of a quadrangular prism battery disclosed herein. Figure 4 This is a schematic structural diagram of another perspective of the core pack 2 in an exemplary embodiment of the quadrangular prism battery disclosed in the present invention. Figure 5 FIG. 2 is a bottom view of a core pack 2 in an exemplary embodiment of a quadrangular prism battery of the present disclosure. Figure 6 FIG. 1 is a side view of a core pack 2 in an exemplary embodiment of a quadrangular prism battery of the present disclosure.
[0029] like Figure 1-6 As shown, the quadrangular prism battery includes: a battery shell 1, a core group 2, and at least one insulating tightening band 3, the battery shell 1 is a steel shell; at least part of the core group 2 is located in the battery shell 1, and no non-adhesive insulating layer is provided between the core group 2 and the battery shell 1, the core group 2 includes one or more cores 21; at least one insulating tightening band 3, the insulating tightening band 3 is bonded to two opposite end faces of the core group 2, and to the connecting end face between the two opposite end faces; wherein, in the insulating tightening band 3 and the connecting end face where the insulating tightening band 3 is located, the ratio of the dimension L1 of the insulating tightening band 3 in the length direction of the connecting end face to the dimension L2 of the connecting end face in its length direction is 0.05-0.7.
[0030] On the one hand, the present exemplary embodiment sets the battery case 1 as a steel case. Since the steel case is not easy to corrode, the present exemplary embodiment can remove the non-adhesive insulating layer such as the Mylar film between the core group 2 and the battery case 1 while satisfying the protection effect of the core group 2, so as to improve the heat conduction rate between the core group 2 and the battery case 1 and the space utilization rate of the battery case 1; on the other hand, after the battery removes the non-adhesive insulating layer such as the Mylar film, the core group 2 is relatively loose. During the process of assembling the core group 2 into the battery case 1, the battery case 1 may scratch the core group 2, thereby causing problems such as a short circuit in the core group 2. The present exemplary embodiment reinforces the core group 2 by the insulating tightening tape 3, thereby reducing the risk of the core group 2 being scratched by the battery case 1 when the core group 2 enters the battery case 1. risk of injury; on the other hand, the ratio of the size of the insulating tape 3 in the length direction of the connecting end face to the size of the connecting end face in its length direction is too small, and the reinforcing effect of the insulating tape 3 on the core group 2 is not obvious; the ratio of the size of the insulating tape 3 in the length direction of the connecting end face to the size of the connecting end face in its length direction is too large, and the influence of the insulating tape 3 on the heat conduction rate between the core group 2 and the battery shell 1 is too large. In this exemplary embodiment, the ratio of the size of the insulating tape 3 in the length direction of the connecting end face to the size of the connecting end face in its length direction is set to an appropriate size. This setting can not only ensure the reinforcing effect of the insulating tape 3 on the core group 2, but also reduce the influence of the insulating tape 3 on the heat conduction rate between the core group 2 and the battery shell 1.
[0031] In this exemplary embodiment, in the insulating band 3 and the connecting end face where the insulating band 3 is located, the ratio of the size of the insulating band 3 in the length direction of the connecting end face to the size of the connecting end face in the length direction is 0.05-0.7. For example, the ratio of the size of the insulating band 3 in the length direction of the connecting end face to the size of the connecting end face in the length direction can be equal to 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, etc. The ratio of the size of the insulating band 3 in the length direction of the connecting end face to the size of the connecting end face in the length direction can preferably be 0.15-0.5. For example, the ratio of the size of the insulating band 3 in the length direction of the connecting end face to the size of the connecting end face in the length direction can be equal to 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, etc.
[0032] In this exemplary embodiment, Figure 1-6As shown, the open end face 41 is the end face of the core 21 that is not covered by the diaphragm. On the open end face 41, the pole piece and the diaphragm are stacked, so that the open end face 41 is an open end face, and the pole 5 ear can be selected to be led out from any open end 41 without damaging the diaphragm. At least one insulating constriction band 3 includes a first insulating constriction band 31, and the core group 2 includes two open end faces 41 arranged opposite to each other in the winding axis of the core 21. The electrolyte can quickly enter the inside of the core 21 through the open end 41, and at the same time, the gas inside the core 21 can be quickly released through the open end 41. Any open end face 41 can form a connecting end face, and the first insulating constriction band 31 can be bonded to at least one open end face 41, as well as two opposite end faces connected to the open end face 41. The core group 2 is relatively loose at the open end face 41, and the first insulating constriction band 31 can constrict the core group 2 at the open end face 41 to facilitate the assembly of the core group 2 into the battery shell 1.
[0033] In this exemplary embodiment, Figure 1-6 As shown, only one open end surface 41 is provided with the insulating band 3 . It should be understood that in other exemplary embodiments, both open end surfaces 41 may be provided with the insulating band 3 .
[0034] In this exemplary embodiment, Figure 1-6 As shown, at least one insulating tightening band 3 may also include a second insulating tightening band 32, and the core group 2 may include multiple cores 21, and the core 21 includes an arc-shaped end face, and the arc-shaped end faces of the multiple cores 21 on the same side form a corner end face 42 of the core group 2, and the corner end face 42 forms a connecting end face; the second insulating tightening band 32 can be bonded to the corner end face 42, and to the two opposite end faces connected to the corner end face 42. The second insulating tightening band 32 can not only fix the multiple cores 21 together, but also press the core group 2 to facilitate the assembly of the core group 2 into the battery housing 1. In addition, the corner end face 42 of the core group 2 is prone to damage, lithium deposition and other problems. The second insulating tightening band 32 can play a certain protective role on the corner end face 42, thereby reducing the risk of damage and lithium deposition of the corner end face 42.
[0035] In this exemplary embodiment, Figure 1-6 As shown, the second insulating band 32 can be provided on two opposite corner end surfaces 42 of the winding core group 2 . It should be understood that in other exemplary embodiments, the second insulating band 32 can also be provided on only one corner end surface 42 of the winding core group 2 .
[0036] In this exemplary embodiment, Figure 1-6As shown, the two open end faces 41 of the winding core group 2 respectively form a first open end face 411 and a second open end face 412; the first insulating tightening band 31 is bonded to the first open end face 411, and to two opposite end faces connected to the first open end face 411, and the winding core group 2 also includes a pole ear 5, and the pole ear 5 is led out from the second open end face 412. This arrangement can avoid mutual interference between the first insulating tightening band 31 and the pole ear 5. In addition, a liquid injection hole 6 is provided on the wall surface of the battery housing 1 opposite to the second open end face 412, and the electrolyte can enter the interior of the battery through the liquid injection hole 6. In this exemplary embodiment, the first insulating tightening band 31 is bonded to the first open end face 411, so as to avoid the first insulating tightening band 31 blocking the second open end face 412, and then the electrolyte can smoothly enter the interior of the winding core group 2 through the second open end face 412.
[0037] It should be understood that in other exemplary embodiments, the tab 5 is led out from the second opening end face 412; the first insulating band 31 may also be bonded to the second opening end face 412 and the two opposite end faces connected to the second opening end face 412. A liquid injection hole 6 is provided on the wall surface of the battery housing 1 opposite to the second opening end face 412. This arrangement can prevent the electrolyte passing through the liquid injection hole 6 from directly impacting the winding core group 2 through the first insulating band 31, thereby reducing the risk of the electrolyte damaging the winding core group 2.
[0038] It should be noted that in different groups of insulating bands 3 and the connecting end faces where the insulating bands 3 are located, the dimensions of the insulating bands 3 in the length direction of the connecting end faces may be the same or different. For example, the dimension of the first insulating band 31 in the length direction of the first opening end face 411 and the dimension of the second insulating band 32 in the length direction of the corner end face 42 of the winding core group 2 may be the same or different.
[0039] In this exemplary embodiment, Figure 1-6As shown, the ratio of the size of the first insulating band 31 in the length direction of the first opening end face 411 to the size of the second insulating band 32 in the length direction of the corner end face 42 of the winding core group 2 is 0.2-5. For example, the ratio of the size of the first insulating band 31 in the length direction of the first opening end face 411 to the size of the second insulating band 32 in the length direction of the corner end face 42 of the winding core group 2 can be equal to 0.2, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, etc. The ratio of the size of the first insulating tightening band 31 in the length direction of the first opening end face 411 to the size of the second insulating tightening band 32 in the length direction of the corner end face 42 of the core group 2 is too large. The size of the first insulating tightening band 31 in the length direction of the first opening end face 411 is too large, and it is difficult for the free electrolyte at the bottom of the battery to enter the core group 2 through the bottom of the core group 2 to replenish the electrolyte required by the core group 2. In addition, the size of the first insulating tightening band 31 in the length direction of the first opening end face 411 is too large, and the tightening strength of the first insulating tightening band 31 on the bottom of the core group 2 is too large. The stress of the core group 2 is transmitted to the top of the core group 2 for release, which will cause the top of the core group 2 to tear; the ratio of the size of the first insulating tightening band 31 in the length direction of the first opening end face 411 to the size of the second insulating tightening band 32 in the length direction of the corner end face 42 of the core group 2 is too small. The size of the first insulating tightening band 31 in the length direction of the first opening end face 411 is too small, and the tightening effect of the first insulating tightening band 31 on the core group 2 is not obvious. In this exemplary embodiment, the ratio of the dimension of the first insulating tightening band 31 in the length direction of the first opening end face 411 and the dimension of the second insulating tightening band 32 in the length direction of the corner end face 42 of the core group 2 is set to an appropriate size. This setting can facilitate the free electrolyte inside the battery casing 1 to enter the core 21 through the bottom of the core group 2, and at the same time, it can also improve the structural stability of the core group 2.
[0040] In this exemplary embodiment, Figure 1-6 As shown, the two open end faces 41 of the winding core group 2 respectively form a first open end face 411 and a second open end face 412; the distance between the second insulating band 32 and the second open end face 412 is h1, and the distance between the second insulating band 32 and the first open end face 411 is h2, and h1 / h2 is 0.5-5. For example, h1 / h2 can be equal to 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, etc. In this exemplary embodiment, h1 / h2 is set to a suitable size, which can avoid excessive tightening force at one end of the winding core group 2, resulting in stress imbalance relative to the other end and cracking.
[0041] In this exemplary embodiment, Figure 1-6As shown, the two open end faces 41 of the core group 2 respectively form a first open end face 411 and a second open end face 412, the first insulating constriction band 31 is bonded to the first open end face 411 and the two opposite end faces connected to the first open end face 411, and the second open end face 412 is not provided with the insulating constriction band 3; wherein, the distance between the second insulating constriction band 32 and the second open end face 412 is h1, and the distance between the second insulating constriction band 32 and the first open end face 411 is h2, and h2 / h1≥1.1. For example, h2 / h1 can be equal to 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, etc. Since the first insulating constriction band 31 is bonded to the first open end face 411, this exemplary embodiment sets h2 to be greater than h1, and this setting can balance the constriction force on the core group 2 at different positions, thereby avoiding excessive concentration of the constriction force of the core group 2 and causing local cracking.
[0042] It should be noted that if Figure 1-6 As shown, the pole lug 5 is led out from the second opening end face 412. It should be understood that in other exemplary embodiments, the pole lug 5 can also be led out from the first opening end face 411. In this exemplary embodiment, the pole lug 5 extends to the outside of the battery housing. It should be understood that in other exemplary embodiments, the pole lug can be located inside the battery housing and can be connected to the pole.
[0043] In this exemplary embodiment, the bonding strength between the insulating band 3 and the winding core group 2 is 0.1Mpa-5Mpa. For example, the bonding strength between the insulating band 3 and the winding core group 2 can be equal to 0.1Mpa, 0.2Mpa, 0.4Mpa, 0.6Mpa, 0.8Mpa, 1Mpa, 1.5Mpa, 2Mpa, 2.5Mpa, 3Mpa, 3.5Mpa, 4Mpa, 4.5Mpa, 5Mpa, etc. If the bonding strength between the insulating band 3 and the winding core group 2 is too small, the insulating band 3 and the winding core group 2 are easily separated; if the bonding strength between the insulating band 3 and the winding core group 2 is too large, the insulating band 3 is not easy to remove. In this exemplary embodiment, the bonding strength between the insulating band 3 and the winding core group 2 is set to an appropriate size, which can ensure that the insulating band 3 and the winding core group 2 are not easy to separate, and can also facilitate the removal of the insulating band 3.
[0044] In this exemplary embodiment, Figure 1-6As shown, the thickness of the insulating band 3 is 0.02mm-0.1mm. For example, the thickness of the insulating band 3 can be equal to 0.02mm, 0.03mm, 0.04mm, 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, etc. If the thickness of the insulating band 3 is too small, the insulating band 3 cannot play a good tightening effect on the winding core group 2. If the thickness of the insulating band 3 is too large, the insulating band 3 occupies a large space of the battery housing 1, and the space utilization rate of the battery housing 1 is low. This exemplary embodiment sets the thickness of the insulating band 3 to a suitable size. This setting can not only ensure the tightening effect of the insulating band 3 on the winding core group 2, but also improve the space utilization rate of the battery housing 1.
[0045] In this exemplary embodiment, Figure 1-6 As shown, the thickness of the battery housing 1 is 0.1mm-0.4mm. For example, the thickness of the battery housing 1 can be equal to 0.1mm, 0.2mm, 0.3mm, 0.4mm, etc. If the thickness of the battery housing 1 is too large, the space utilization rate inside the battery is too small, which will affect the energy density of the battery; if the thickness of the battery housing 1 is too small, the strength of the battery housing 1 is insufficient, and the battery housing 1 is easily deformed under the action of external forces. This exemplary embodiment sets the thickness of the battery housing 1 to a suitable size, which can ensure both the energy density of the battery and the strength of the battery housing 1.
[0046] In this exemplary embodiment, Figure 1-6 As shown, the cross-sectional area of the core pack 2 perpendicular to the winding axis of the core 21 is S1, and the cross-sectional area of the battery housing 1 perpendicular to the winding axis of the core 21 is S2, S1 / S2≤99%, for example, S1 / S2 can be equal to 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, etc. In this exemplary embodiment, S1 / S2 is set to a smaller value, so that the core pack 2 can be easily inserted into the battery housing 1.
[0047] In this exemplary embodiment, Figure 4 , 7 As shown, Figure 7 for Figure 4 The enlarged view of the local area BB of the winding core group 2 is shown. The insulating band 3 includes a serrated side edge 7 located on the largest end surface of the winding core group 2, and the ratio of the total length of the serrations of the serrated side edge 7 to the length L3 of the serrated side edge is 1.01-3. For example, the ratio of the total length of the serrations of the serrated side edge 7 to the length L3 of the serrated side edge can be equal to 1.01, 1.2, 1.4, 1.6, 1.8, 2, 2.2, 2.4, 2.6, 2.8, 3, etc.
[0048] The total length of the serrations of the serrated side edge 7 is the total length of the serrated side edge 7 after being straightened. If the ratio of the total length of the serrations of the serrated side edge 7 to the length L3 of the serrated side edge is too large, the serrated side edge 7 is likely to crush the largest side surface of the core group 2; if the ratio of the total length of the serrations of the serrated side edge 7 to the length L3 of the serrated side edge is too small, the bonding length between the serrated side edge 7 and the core group 2 is small, and the bonding strength between the serrated side edge 7 and the core group 2 is insufficient. In this exemplary embodiment, the ratio of the total length of the serrations of the serrated side edge 7 to the length L3 of the serrated side edge is set to an appropriate size, which can prevent the serrated side edge 7 from crushing the largest side surface of the core group 2, and can also ensure the bonding strength between the serrated side edge 7 and the core group 2.
[0049] In this exemplary embodiment, Figure 1-6 As shown, the insulating band 3 is bonded to the two opposite end faces of the core group 2 in the thickness direction of the core 21, and the connecting end face between the two end faces. The insulating band 3 can be used to band the core group 2 in the thickness direction of the core 21. The thickness direction of the core 21 is perpendicular to the largest side of the core.
[0050] In this exemplary embodiment, the insulating band 3 may be an insulating adhesive tape.
[0051] In this exemplary embodiment, the winding core may include a winding core body and a pole ear. The winding core body includes a positive electrode sheet and a negative electrode sheet stacked and a separator between the positive and negative electrode sheets. The continuous positive electrode sheet, separator and negative electrode sheet are formed by continuous winding to form a wound battery cell. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer located on at least one side of the positive electrode collector. The negative electrode sheet may include a negative electrode collector and a negative electrode active material layer located on at least one side of the negative electrode collector. The pole ear includes a positive electrode ear and a negative electrode ear. The positive electrode ear 5 is connected to the positive electrode collector in the positive electrode sheet. For example, the positive electrode ear 5 can be formed by cutting the positive electrode collector material layer; the negative electrode ear 5 is connected to the negative electrode collector in the negative electrode sheet. For example, the negative electrode ear 5 can be formed by cutting the negative electrode collector material layer. The positive electrode active material of the lithium-ion battery can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide. The negative electrode active material can be graphite, silicon, etc. During charging, lithium ions are separated from the positive electrode active material and move through the electrolyte to the negative electrode active material. The lithium ions are embedded in the interlayer gaps of the carbon material, completing the battery charging process. During discharging, lithium ions are separated from the negative electrode active material and move through the electrolyte to the positive electrode active material, completing the battery discharging process.
[0052] In this exemplary embodiment, the battery may be a lithium-ion battery. It should be understood that in other exemplary embodiments, the battery may also be a nickel-cadmium battery, a nickel-metal hydride battery, a lithium polymer battery, a sodium-ion battery, a solid-state battery, etc.
[0053] In this exemplary embodiment, the battery can be a square battery, that is, the battery can be a quadrangular prism-type battery. The quadrangular prism-type battery mainly refers to a battery with a prism shape, but it is not strictly limited whether each side of the prism must be a straight line in the strict sense, and the corners between the sides are not necessarily right angles, and can be arc transitions.
[0054] The exemplary embodiment further provides a battery device, which is a battery module or a battery pack.
[0055] The battery module includes a plurality of batteries, and the batteries may be square batteries. The battery module may further include end plates and side plates, and the end plates and side plates are used to fix the plurality of batteries.
[0056] The battery pack includes a plurality of batteries and a box body, and the box body is used to fix the plurality of batteries.
[0057] It should be noted that the battery pack includes a battery, and the battery may be multiple, and the multiple batteries are arranged in the box. Among them, the multiple batteries can be installed in the box after forming a battery module. Alternatively, the multiple batteries can be directly arranged in the box, that is, there is no need to group the multiple batteries, and the box is used to fix the multiple batteries.
[0058] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing what is disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary technical means in the art that are not disclosed in the present disclosure. The specification and embodiments are to be considered merely as exemplary, and the true scope and spirit of the present disclosure are indicated by the claims.
[0059] The drawings in the present disclosure only relate to the structures involved in the present disclosure, and other structures may refer to the usual design. In the absence of conflict, the embodiments of the present disclosure and the features in the embodiments may be combined with each other to obtain new embodiments. It should be understood by those of ordinary skill in the art that the technical solutions of the present disclosure may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present disclosure, and should be included in the scope of the claims of the present disclosure.
[0060] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims
1. A quadrangular prism battery, characterized in that: The quadrangular prism battery comprises: A battery housing (1), wherein the battery housing (1) is a steel shell; A core assembly (2) is at least partially located in the battery housing (1), and no non-adhesive insulating layer is provided between the core assembly (2) and the battery housing (1), and the core assembly (2) comprises one or more cores (21); At least one insulating band (3), the insulating band (3) being bonded to two opposite end faces of the winding core group (2) and to a connecting end face between the two opposite end faces; Among them, in the insulating tightening band (3) and the connecting end face where the insulating tightening band (3) is located, the ratio of the size of the insulating tightening band (3) in the length direction of the connecting end face to the size of the connecting end face in its length direction is 0.05-0.
7.
2. The quadrangular prism battery according to claim 1, characterized in that: At least one insulating tightening band (3) includes a first insulating tightening band (31), the core group (2) includes two open end surfaces (41) arranged opposite to each other in the winding axis direction of the core (21), any one of the open end surfaces (41) forms the connecting end surface, and the first insulating tightening band (31) is bonded to at least one of the open end surfaces (41) and to two opposite end surfaces connected to the open end surfaces (41).
3. The quadrangular prism battery according to claim 1 or 2, characterized in that: At least one insulating band (3) includes a second insulating band (32), the core group (2) includes a plurality of cores (21), the cores (21) include arc-shaped end surfaces, and the arc-shaped end surfaces of the plurality of cores (21) located on the same side form a corner end surface (42) of the core group (2); The corner end face (42) forms the connecting end face, and the second insulating band (32) is bonded to the corner end face (42) and to two opposite end faces connected to the corner end face (42).
4. The quadrangular prism battery according to claim 2, characterized in that: The two opening end surfaces (41) of the winding core group (2) respectively form a first opening end surface (411) and a second opening end surface (412); The first insulating tightening band (31) is bonded to the first opening end surface (411) and to two opposite end surfaces connected to the first opening end surface (411), and the winding core group (2) also includes a pole ear (5), and the pole ear (5) is led out from the second opening end surface (412).
5. The quadrangular prism battery according to claim 4, characterized in that: A liquid injection hole (6) is provided on a wall surface of the battery housing (1) opposite to the second opening end surface (412).
6. The battery according to claim 2, characterized in that The two opening end surfaces (41) of the winding core group (2) respectively form a first opening end surface (411) and a second opening end surface (412); The winding core assembly (2) further comprises a pole ear (5), wherein the pole ear (5) is led out from the second opening end surface (412); The first insulating tightening band (31) is bonded to the second opening end surface (412) and to two opposite end surfaces connected to the second opening end surface (412).
7. The quadrangular prism battery according to claim 4, characterized in that: At least one insulating band (3) includes a second insulating band (32), the core group (2) includes a plurality of cores (21), the cores (21) include arc-shaped end surfaces, and the arc-shaped end surfaces of the plurality of cores (21) located on the same side form a corner end surface (42) of the core group (2); The corner end face (42) forms the connecting end face, and the second insulating band (32) is bonded to the corner end face (42) and to two opposite end faces connected to the corner end face (42); The ratio of the dimension of the first insulating tightening band (31) in the length direction of the first opening end surface (411) to the dimension of the second insulating tightening band (32) in the length direction of the corner end surface (42) of the winding core group (2) is 0.2-5.
8. The quadrangular prism battery according to claim 3, characterized in that: The winding core group (2) comprises two opening end surfaces (41) arranged opposite to each other in the winding axis direction of the winding core (21), and the two opening end surfaces (41) of the winding core group (2) respectively form a first opening end surface (411) and a second opening end surface (412); The distance between the second insulating band (32) and the second opening end surface (412) is h1, the distance between the second insulating band (32) and the first opening end surface (411) is h2, and h1 / h2 is 0.5-5.
9. The quadrangular prism battery according to claim 2, characterized in that: At least one insulating band (3) includes a second insulating band (32), the core group (2) includes a plurality of cores (21), the cores (21) include arc-shaped end surfaces, and the arc-shaped end surfaces of the plurality of cores (21) located on the same side form a corner end surface (42) of the core group (2); The corner end face (42) forms the connecting end face, and the second insulating band (32) is bonded to the corner end face (42) and to two opposite end faces connected to the corner end face (42); The two open end surfaces (41) of the winding core group (2) respectively form a first open end surface (411) and a second open end surface (412); the first insulating band (31) is bonded to the first open end surface (411) and to two opposite end surfaces connected to the first open end surface (411); and the second open end surface (412) is not provided with the insulating band (3); The distance between the second insulating band (32) and the second opening end surface (412) is h1, the distance between the second insulating band (32) and the first opening end surface (411) is h2, and h2 / h1≥1.
1.
10. The quadrangular prism battery according to claim 9, characterized in that: The winding core assembly (2) further comprises a pole lug (5); The pole lug (5) is led out from the first opening end surface (411), or the pole lug (5) is led out from the second opening end surface (412).
11. The quadrangular prism battery according to claim 1 or 2, characterized in that: The bonding strength between the insulating tightening band (3) and the winding core group (2) is 0.1Mpa-5Mpa.
12. The battery according to claim 1 or 2, characterized in that: The thickness of the insulating tightening tape (3) is 0.02 mm-0.1 mm.
13. The quadrangular prism battery according to claim 1 or 2, characterized in that: The thickness of the battery casing (1) is 0.1 mm-0.4 mm.
14. The quadrangular prism battery according to claim 1 or 2, characterized in that: The cross-sectional area of the winding core group (2) perpendicular to the winding axis of the winding core (21) is S1, and the cross-sectional area of the battery housing (1) perpendicular to the winding axis of the winding core (21) is S2, and S1 / S2≤99%.
15. The quadrangular prism battery according to claim 1 or 2, characterized in that: The insulating tightening belt (3) comprises a serrated side edge (7) located on the largest end face of the winding core group (2), and the ratio of the total length of the serrations of the serrated side edge (7) to the length of the serrated side edge (7) is 1.01-3.
16. The quadrangular prism battery according to claim 1 or 2, characterized in that: The insulating tightening band (3) is bonded to two opposite end faces of the winding core group (2) in the thickness direction of the winding core (21), and to a connecting end face between the two end faces.
17. The quadrangular prism battery according to claim 1 or 2, characterized in that: The ratio of the dimension of the insulating tightening band (3) in the length direction of the connecting end face to the dimension of the connecting end face in its length direction is 0.15-0.
5.
18. A battery device, characterized in that: The battery device comprises the quadrangular prism battery according to any one of claims 1 to 17.