Battery monomer, energy storage device and electric equipment

Abstract

The utility model relates to a battery monomer, an energy storage device and electric equipment. The battery monomer comprises an insulating part, a protecting part, a battery cell, a shell and an end cover, a plurality of first bosses are arranged on the edge of the insulating part; the battery cell is arranged on one side of the insulating part; the protection part is arranged along the edge of the insulation part in a surrounding manner and corresponds to the outer surface of the battery cell, a plurality of first through holes are formed in the protection part, and the plurality of first bosses correspondingly penetrate through the plurality of first through holes respectively to limit the protection part; the shell is arranged on one side, deviating from the battery cell, of the protection piece in a surrounding manner, and an opening is formed in the shell; the end cover covers the opening, and the end cover corresponds to the insulating part. The battery monomer provided by the utility model has the advantages that the protection part is positioned more accurately so as to improve the battery cell fixing effect, the structural strength of the edge of the insulating part is improved, the probability of collapse of the shell during negative pressure pumping is reduced, and then the battery performance is improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery production, and in particular to battery cells, energy storage devices and electrical equipment. Background Art

[0002] Rechargeable battery, also known as rechargeable battery or storage battery, refers to a battery that can be used again by recharging the active material after the battery is discharged. The recyclable nature of secondary batteries has made them gradually become the main power source for electrical equipment. As the demand for secondary batteries gradually increases, people have higher and higher requirements for their performance in all aspects, especially the requirements for the energy density per unit volume of batteries. Traditional secondary batteries use protective films to protect the battery cells. The protective film plays a role in protecting and fixing the core, while ensuring the insulation performance between the battery cell and the shell. The hot melting position of the protective film is on the lower plastic side. However, the protective film is relatively thin. If the hot melting time is long and the pressure is high, it will cause over-melting and wire drawing; if the time is short and the pressure is low, it will cause cold welding; and the protective film is easy to loosen, affecting its fixing effect on the core. In addition, if the protective film is in a loose state, it will cause scratches with the shell when entering the shell, making it difficult to enter the shell. Therefore, the installation quality of the protective film needs to be improved to optimize battery performance. Summary of the invention

[0003] Based on this, it is necessary to provide a battery cell, an energy storage device and an electrical equipment to address the problem of difficulty in improving the protective effect of the battery cell protective film.

[0004] In one aspect, the present application provides a battery cell, the battery cell comprising:

[0005] An insulating member, wherein a plurality of first bosses are arranged on an edge of the insulating member;

[0006] A battery cell, arranged on one side of the insulating member;

[0007] A protective member is disposed along the edge of the insulating member and corresponds to the outer surface of the battery core, the protective member is provided with a plurality of first through holes, and a plurality of first bosses respectively and correspondingly pass through the plurality of first through holes to limit the protective member;

[0008] A shell is disposed around a side of the protective member facing away from the battery cell, and the shell forms an opening;

[0009] An end cover is disposed on the opening, and the end cover corresponds to the insulating member.

[0010] In one embodiment, the first boss includes a first protruding piece and a second protruding piece, the first protruding piece is connected to the end cover, the second protruding piece is arranged at an end of the first protruding piece away from the end cover, and the edge of the second protruding piece protrudes from the edge of the end of the first protruding piece away from the end cover.

[0011] In one embodiment, the first through hole is circular, the radial cross section of the second protrusion is circular, and the diameter of the first through hole is smaller than the diameter of the cross section.

[0012] In one embodiment, the second protruding member is provided with a curved surface.

[0013] In one embodiment, the first boss is also used for hot melting, and is hot melted until the first boss is flush with the protective member in the first through hole, so as to bond and fix the protective member.

[0014] In one embodiment, the shell is in the shape of a square cylinder.

[0015] In one of the embodiments, a second boss is further provided on the edge of the insulating member, and a third boss is provided on the inner wall of the shell, and the third boss is abutted and matched with the second boss.

[0016] In one embodiment, the second boss bends in a direction perpendicular to the thickness direction of the insulating member and away from the insulating member, away from the battery cell; and the third boss bends in a direction close to the battery cell, along the thickness direction of the shell and away from the shell.

[0017] On the other hand, the present application provides an energy storage device, comprising the above-mentioned battery cell.

[0018] On the other hand, the present application also provides an electrical equipment, including the above-mentioned energy storage device.

[0019] The battery cell is provided with a first boss on the edge of the insulating member, and a first through hole corresponding to the first boss is provided on the protective member, so that the protective member and the insulating member can be assembled and connected, so that the protective member is more accurately positioned and not easy to loosen, thereby improving its fixing effect on the battery cell. On the other hand, the first boss is provided on the edge of the insulating member to improve the structural strength of the edge of the insulating member, reduce the probability of collapse of the battery shell during the negative pressure extraction step in the battery production process, and thus provide more infiltration space for the electrolyte, thereby improving battery performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of a battery cell (with the shell hidden) in one embodiment of the present application.

[0021] Figure 2 for Figure 1 A magnified schematic diagram of center A.

[0022] Figure 3 Schematic diagram of the structure of an insulating member of a battery cell in one embodiment of the present application.

[0023] Figure 4 for Figure 3 A magnified schematic diagram of point B in the middle.

[0024] Figure 5 Schematic diagram of the structure of an insulating member of a battery cell in one embodiment of the present application.

[0025] Figure 6 for Figure 5 Enlarged schematic diagram of point C in the middle.

[0026] Figure 7 Schematic diagram of the structure of a battery cell in one embodiment of the present application.

[0027] Figure 8 for Figure 7 Enlarged schematic diagram of point D in the middle.

[0028] Description of Figure Numbers:

[0029] 100, insulating member; 110, first boss; 111, first protruding member; 112, second protruding member; 120, flange; 130, second boss; 200, protective member; 200a, first through hole; 200b, second through hole; 300, housing; 310, third boss. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0031] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0032] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0033] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0034] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0035] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0036] See also Figure 1 , Figure 1 The schematic diagram of the structure of a battery cell in an embodiment of the present application is shown. The battery cell provided in an embodiment of the present application includes an insulating member 100, a protective member 200 and a battery cell (not shown). A plurality of first bosses 110 are arranged on the edge of the insulating member 100; the battery cell is arranged on one side of the insulating member 100, the protective member 200 is arranged along the edge of the insulating member 100 and corresponds to the outer surface of the battery cell, the protective member 200 is provided with a plurality of first through holes 200a, and the plurality of first bosses 110 respectively pass through the plurality of first through holes 200a to limit the protective member 200, the shell 300 is arranged around the side of the protective member 200 away from the battery cell, and the shell 300 forms an opening; the end cover (not shown) is arranged to cover the opening, and the end cover corresponds to the insulating member 100.

[0037] The battery cell described in the present application is provided with a first boss 110 on the edge of the insulating member 100, and a first through hole 200a corresponding to the first boss 110 is provided on the protective member 200. The first boss 110 passes through the first through hole 200a, so that the protective member 200 is more accurately positioned and not easy to loosen, thereby improving its fixing effect on the battery cell. On the other hand, providing the first boss 110 on the edge of the insulating member 100 can improve the structural strength of the edge of the insulating member 100, reduce the probability of collapse of the housing 300 during the negative pressure extraction step in the battery production process, and thus provide more infiltration space for the electrolyte, thereby improving battery performance.

[0038] Illustratively, in this embodiment, the insulating member 100 is a lower plastic member, which is connected to the end cover, and the battery cell is located on a side of the lower plastic member away from the end cover.

[0039] For example, reference Figures 3 to 5 The insulating member 100 is approximately in the shape of a flat plate, and is provided with a plurality of through holes for heat dissipation or installation of other components. The edge of the insulating member 100 is provided with a flange 120 protruding downwards to facilitate fixing the protective member 200.

[0040] In other embodiments, the insulating member 100 may also be configured as an arc plate or other shapes according to actual needs.

[0041] After the protective member 200 is folded and fixed with adhesive, it can be considered that the protective member 200 is rolled along the edge of the insulating member 100 and wrapped around the outer peripheral side of the battery cell. In this embodiment, the protective member 200 is a Mylar film.

[0042] The first through hole 200 a is aligned with the first boss 110 so that the first boss 110 passes through the first through hole 200 a , thereby positioning the protection member 200 on the edge of the insulating member 100 .

[0043] The shell 300 is disposed around the outside of the protective member 200 to protect the battery cell and to fix the entire battery cell in a fixed shape for easy handling and carrying. In this embodiment, the shell is in the shape of a square cylinder. It can be understood that the two ends of the shell 300 form a square opening, and the end cover is covered on the opening, so that the entire battery cell is in a closed state, which has a better protection effect on the battery cell. In other embodiments, the shell 300 can be cylindrical or other shapes.

[0044] In some embodiments, the first boss 110 includes a first protruding piece 111 and a second protruding piece 112. The first protruding piece 111 is connected to the insulating member 100, and the second protruding piece 112 is disposed at an end of the first protruding piece 111 away from the insulating member 100, and the edge of the second protruding piece 112 protrudes from the edge of the end of the first protruding piece 111 away from the insulating member 100.

[0045] For example, reference Figures 1 to 6 The first protruding piece 111 is in the shape of a short cylinder, one end of the first protruding piece 111 is fixedly connected to the flange 120 of the insulating member 100, and the other end extends in a direction away from the flange 120 of the insulating member 100. The second protruding piece 112 is connected to the end of the first protruding piece 111 away from the flange 120. In this embodiment, the radial cross section of the end of the second protruding piece 112 close to the first protruding piece 111 is circular, and the diameter of the circular cross section is slightly larger than that of the first protruding piece 111, so that the annular edge of the second protruding piece 112 protrudes from the annular edge of the first protruding piece 111. In this way, it can be understood that after the first boss 110 penetrates the first through hole 200a of the protective member 200, the first through hole 200a stays at a position corresponding to the first protruding piece 111, and the second protruding piece 112 plays a role in preventing the protective member 200 from sliding out in a direction away from the insulating member 100. In this way, the insulating member 100 has a better positioning effect on the protective member 200, which improves the fixing quality of the battery cell, thereby optimizing the product quality of the battery. At the same time, since the edge of the second protruding member 112 protrudes from the edge of the end of the first protruding member 111 away from the insulating member 100, the second protruding member 112 has a larger heat dissipation area, which can absorb more heat in the step of hot-melt fixing the protective member 200, thereby reducing the deformation of the insulating member 100.

[0046] In some other embodiments, the first protruding piece 111 and the second protruding piece 112 may also be in other shapes respectively. For example, the first protruding piece 111 and the second protruding piece 112 may be in a square shape, an ellipsoid shape, etc. respectively.

[0047] In some embodiments, the material of the first boss 110 is plastic. The protective member 200 can also be fixed to the insulating member 100 by hot melt to improve the fixing effect of the protective member 200. Specifically, in the present embodiment, the heating point is located about 0.3mm~0.75mm above the center of the first protrusion 111. When heating, since the material of the first boss 110 is plastic, at this time, the melted part is mainly the first boss 110 instead of the protective member 200, which can reduce the overmelting rate and thus improve the yield rate of the battery cell. The first boss 110 can be integrally formed with the insulating member 100, or it can be fixedly connected to the insulating member 100 by bonding or ultrasonic welding, which is not limited here.

[0048] In some embodiments, reference Figure 2 and Figure 6 , the first through hole 200a is circular, the cross section of the second protruding piece 112 is circular, and the diameter of the first through hole 200a is smaller than the diameter of the cross section. The protective member 200 has a certain elasticity, and the diameter of the first through hole 200a is set to be slightly smaller than the diameter of the cross section of the second protruding piece 112. When the protective member 200 is positioned, the second protruding piece 112 expands the first through hole 200a. When the first through hole 200a slides into a position corresponding to the first protruding piece 111, the first through hole 200a shrinks. The first through hole 200a is set to be circular. When positioning, the first through hole 200a is expanded by the second protruding piece 112 with higher uniformity, which is more conducive to accurately positioning the protective member 200. At the same time, the second protruding piece 112 has a better effect of preventing the protective member 200 from sliding out.

[0049] In some embodiments, the second protruding member 112 is provided with a curved surface. Figure 5 and Figure 6 , illustratively, the end of the second protrusion 112 away from the flange 120 is in the shape of an arc surface, so that the second protrusion 112 is approximately in the shape of a convex mirror, and the first protrusion 111 and the second protrusion 112 are in the shape of a mushroom head as a whole. It can be understood that the end of the second protrusion 112 away from the convex surface is set as an arc surface, which can reduce the resistance when the protective member 200 is positioned, and the arc surface plays a guiding role, further improving the effect of positioning the protective member 200 on the insulating member 100. On the other hand, the first protrusion 111 and the second protrusion 112 constitute a mushroom head structure, which greatly optimizes the positioning and fixing effect of the protective member 200. In certain cases, the hot melt fixing step can be simplified or even eliminated, thereby ensuring the insulation of the battery cell from the outside to the greatest extent and simplifying the battery production process.

[0050] In some embodiments, the insulating member 100 is in the shape of a rectangular plate, and the long side edge and the short side edge of the insulating member 100 are both provided with a flange 120 protruding downward, and the first boss 110 corresponds to the flange 120 of the long side edge of the insulating member 100. Figures 3 to 5 Specifically, three flanges 120 are provided on each long side edge of the insulating member 100 in this embodiment, two of which correspond to the corners of the insulating member 100, and the other flange 120 corresponds to the middle of the long side edge of the insulating member 100, each flange 120 is provided with a first boss 110, and the entire insulating member 100 is provided with six first bosses 110, which can be used to position the protective member 200 from both sides of the insulating member 100. The first bosses 110 are arranged on the long side edges of the insulating member 100, and more first bosses 110 can be arranged, which has a better positioning and fixing effect on the protective member 200.

[0051] In some embodiments, the first boss 110 is also used for hot melting, and hot melting until the first boss 110 is flush with the protective member 200 in the first through hole 200a, so as to bond and fix the protective member 200. Exemplarily, when the first boss 110 is approximately rectangular or other shapes, the first boss 110 is heated to make the first boss 110 hot melt, and the melted first boss 110 fills the first through hole 200a and bonds the protective member 200, and the surface of the first boss 110 facing away from the battery cell is flush with the surface of the protective member 200. In this way, the first boss 110 is flush with the surface of the protective member 200 after hot melting, and the connection effect is better, so that the connection between the insulating member 100 and the protective member 200 is more stable.

[0052] In some embodiments, the housing 300 is sleeved outside the protective member 200, and the battery cell (not shown) is connected to the insulating member 100 and is arranged inside the protective member 200. In this embodiment, the installation process of the rechargeable battery is as follows: the protective member 200 is folded on the large surface and the side surface so that the protective member 200 is fixed along the edge of the insulating member 100, and then the first boss 110 is hot-melted so that the protective member 200 is fixedly connected to the insulating member 100, and finally the battery cell covered with the protective member 200 is integrally placed into the housing 300 (i.e., into the shell).

[0053] In some embodiments, the insulating member 100 of the rechargeable battery is further provided with a second boss 130, which is provided at the short side edge of the insulating member 100 and corresponds to the flange 120 provided at the short side edge. Figure 7 and Figure 8 Specifically, a second square through hole 200b is provided on one side of the protective member 200 corresponding to the short side edge of the insulating member 100, and the second boss 130 passes through the second through hole 200b and extends away from the insulating member 100. A third boss 310 is provided on the inner wall of the housing 300, that is, the side opposite to the housing 300 and the battery cell, and the third boss 310 extends toward the protective member 200. The third boss 310 corresponds to the second boss 130, and the second boss 130 extends toward the protective member 200. Figure 7Taking the rechargeable battery shown in the figure as an example, during the shell insertion operation, when the battery cell enters the shell 300 from bottom to top and reaches a certain distance, the third boss 310 abuts against the second boss 130, preventing the shell 300 and the insulating member 100 from further moving relative to each other. In this way, the accuracy of the battery cell insertion can be improved, and the structural stability of the battery cell is improved, thereby improving the quality rate of the battery product.

[0054] In some embodiments, the second boss 130 bends away from the battery cell along a direction perpendicular to the thickness direction of the insulating member 100 and away from the insulating member 100 ; the third boss 310 bends toward the battery cell along the thickness direction of the shell 300 and away from the shell 300 .

[0055] For example, Figure 8 For example, the second boss 130 bends upward and the third boss 310 bends downward. It can be understood that during the shell insertion operation, when the battery cell enters the shell 300 to a certain distance, the second boss 130 and the third boss 310 abut against each other, and because the second boss 130 and the third boss 310 are bent upward and downward respectively, the second boss 130 and the third boss 310 are prevented from slipping when abutting against each other, and the abutting effect is better, which improves the positioning accuracy of the insulating member 100 and the shell 300.

[0056] Of course, in other embodiments, the second boss 130 may be bent toward the direction close to the battery cell in the direction away from the insulating member 100; correspondingly, the third convex strip may be bent toward the direction away from the battery cell in the direction away from the housing 300. In this way, the abutment effect between the second boss 130 and the third boss 310 may also be improved.

[0057] The present application also provides an energy storage device, which includes the above-mentioned battery cells. Specifically, the energy storage device described in the present application can be a battery pack, which is composed of multiple battery cells connected in series or in parallel. Since the battery cells have better performance than ordinary batteries, the energy storage device also has better performance and can provide power for a longer period of time.

[0058] The present application also provides an electric device, which includes the energy storage device described above. Specifically, the electric device can be a new energy vehicle, which uses the battery pack described above for power supply. Due to the excellent performance of the energy storage device, the electric device can also perform better.

[0059] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0060] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A battery cell, characterized in that: The battery cell comprises: An insulating member, wherein a plurality of first bosses are arranged on an edge of the insulating member; A battery cell, arranged on one side of the insulating member; A protective member is disposed along the edge of the insulating member and corresponds to the outer surface of the battery core, the protective member is provided with a plurality of first through holes, and a plurality of first bosses respectively and correspondingly pass through the plurality of first through holes to limit the protective member; A shell is disposed around a side of the protective member facing away from the battery cell, and the shell forms an opening; An end cover is disposed on the opening, and the end cover corresponds to the insulating member.

2. The battery cell according to claim 1, characterized in that: The first boss includes a first protruding piece and a second protruding piece, the first protruding piece is connected to the end cover, the second protruding piece is arranged at an end of the first protruding piece away from the end cover, and the edge of the second protruding piece protrudes from the edge of the end of the first protruding piece away from the end cover.

3. The battery cell according to claim 2, characterized in that: The first through hole is circular, the radial cross section of the second protruding piece is circular, and the diameter of the first through hole is smaller than the diameter of the cross section.

4. The battery cell according to claim 3, characterized in that: The second protruding piece is provided with a curved surface.

5. The battery cell according to any one of claims 1 to 4, characterized in that: The first boss is also used for hot melting, and is hot melted until the first boss is flush with the protective member in the first through hole, so as to bond and fix the protective member.

6. The battery cell according to any one of claims 1 to 4, characterized in that: The shell is in a square cylinder shape.

7. The battery cell according to claim 1, characterized in that: A second boss is also provided on the edge of the insulating member, and a third boss is provided on the inner wall of the shell, and the third boss is abutted and matched with the second boss.

8. The battery cell according to claim 7, characterized in that: The second boss is bent in a direction away from the battery cell along a direction perpendicular to the thickness of the insulating member and away from the insulating member; and the third boss is bent in a direction close to the battery cell along a direction perpendicular to the thickness of the shell and away from the shell.

9. An energy storage device, characterized in that: A battery cell comprising the battery cell according to any one of claims 1 to 8.

10. An electrical device, characterized in that: Includes the energy storage device as described in claim 9.

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