Battery case, secondary battery, liquid injection device, battery pack, and electronic device

Abstract

The utility model provides a battery shell, which comprises a shell body, a first side wall, a second side wall, a third side wall and a fourth side wall, the shell body is provided with a first side wall, a second side wall, a third side wall and a fourth side wall, the second side wall is opposite to the first side wall, the third side wall and the fourth side wall are connected with the first side wall and the second side wall and are arranged oppositely, the area of the first side wall and the second side wall is larger than that of the third side wall and the fourth side wall, and the third side wall is provided with a liquid injection hole; the first top cover is connected with the first side wall, the second side wall, the third side wall and the fourth side wall, the first top cover comprises a negative pole, and the distance between the negative pole and the third side wall is smaller than that between the negative pole and the fourth side wall. The utility model aims to provide a battery shell, a secondary battery, a liquid injection device, a battery pack and an electronic device, so as to at least improve the safety of the battery shell.

Description

Technical Field

[0001] An embodiment of the present utility model relates to a battery case, a secondary battery, a liquid injection device, a battery pack and an electronic device. Background Art

[0002] In the field of new energy power batteries, secondary batteries such as lithium-ion batteries are usually used as energy storage units for equipment such as electric vehicles and energy storage stations, which have the advantages of large energy storage capacity, high energy density, and recyclability. The position of the liquid injection hole of the current double-pass battery is usually located on the positive electrode top cover. During the liquid injection and formation stages of the battery cell, the battery cell is in an upright state: that is, the positive electrode top cover is on the upper part, the negative electrode top cover is on the lower part, and the inner side of the negative electrode top cover is completely immersed in the electrolyte. Summary of the Utility Model

[0003] Aiming at the problems existing in the related art, the purpose of the present utility model is to provide a battery case, a secondary battery, a liquid injection device, a battery pack and an electronic device to at least improve the safety of the battery case.

[0004] To achieve the above purpose, the present utility model provides a battery case, including: a housing having a first side wall, a second side wall opposite to the first side wall, a third side wall and a fourth side wall connecting the first side wall and the second side wall and arranged opposite to each other, the areas of the first side wall and the second side wall are larger than those of the third side wall and the fourth side wall, and a liquid injection hole is provided on the third side wall; a first top cover connecting the first side wall, the second side wall, the third side wall and the fourth side wall, the first top cover includes a negative electrode terminal, and the distance between the negative electrode terminal and the third side wall is less than the distance between the negative electrode terminal and the fourth side wall.

[0005] In some embodiments, the battery case further includes: a second top cover arranged opposite to the first top cover and connecting the first side wall, the second side wall, the third side wall and the fourth side wall, the second top cover includes a positive electrode terminal, and the distance between the positive electrode terminal and the third side wall is less than the distance between the positive electrode terminal and the fourth side wall.

[0006] In some embodiments, no liquid injection hole is provided on the first top cover and the second top cover.

[0007] In some embodiments, the distance between the liquid injection hole and the first top cover is less than the distance between the liquid injection hole and the second top cover.

[0008] In some embodiments, when projected along the direction from the first top cover to the second top cover, the negative electrode terminal and the positive electrode terminal overlap.

[0009] In some embodiments, the material of the housing is aluminum.

[0010] An embodiment of the present application further provides a secondary battery, including: the battery case according to any one of the above; and an electrode assembly accommodated in the battery case.

[0011] An embodiment of the present application further provides a liquid injection device, which injects electrolyte into the secondary battery through the liquid injection hole of any one of the above.

[0012] An embodiment of the present application further provides a battery pack, including at least one of the battery housing of any one of the above and the secondary battery.

[0013] An embodiment of the present application further provides an electronic device, including at least one of the battery housing of any one of the above, the secondary battery, and the battery pack.

[0014] The beneficial technical effects of the present utility model are as follows:

[0015] The liquid injection hole of the embodiment of the present application is arranged on the third side wall closer to the negative electrode terminal. Therefore, the liquid injection hole and the negative electrode terminal are on the same side. During the liquid injection, formation, and other production processes of the secondary battery, the secondary battery is placed on its side, which can, to a certain extent, prevent the electrolyte from entering the inner side of the first top cover where the negative electrode terminal is located, thereby avoiding affecting the insulation resistance value of the first top cover and improving the safety of the battery housing and the secondary battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 Shows a schematic diagram when the electronic device of the embodiment of the present application is a vehicle.

[0018] Figure 2 Shows a perspective view of a secondary battery according to an embodiment of the present application.

[0019] Figure 3 Shows a front view of a secondary battery according to an embodiment of the present application.

[0020] Figure 4 Shows a top view of a secondary battery according to an embodiment of the present application.

[0021] Figure 5 Shows a sectional view taken along the A-A line of Figure 4

[0022] Figure 6 Shows Figure 5 An enlarged view of area B in

[0023] Figure 7 ​Shows a secondary battery and a liquid injection device according to an embodiment of the present application. Detailed implementation mode

[0024] To better understand the spirit of the embodiments of the present application, the following further describes it in conjunction with some preferred embodiments of the present application.

[0025] The embodiments of the present application will be described in detail below. Throughout the specification of the present application, the same or similar components and components with the same or similar functions are represented by similar reference numerals. The embodiments related to the drawings described herein are illustrative, diagrammatic and are used to provide a basic understanding of the present application. The embodiments of the present application should not be construed as a limitation of the present application.

[0026] As used herein, the terms "substantially", "generally", "essentially" and "about" are used to describe and account for minor variations. When used in connection with an event or circumstance, the terms can refer to instances where the event or circumstance occurs exactly and instances where the event or circumstance occurs very nearly.

[0027] In this specification, unless specifically specified or limited otherwise, relative terms such as: "central", "longitudinal", "lateral", "front", "rear", "right", "left", "inner", "outer", "lower", "higher", "horizontal", "vertical", "above", "below", "upper", "lower", "top", "bottom" and their derivative terms (such as "horizontally", "downwardly", "upwardly", etc.) should be interpreted as referring to the directions described in the discussion or depicted in the drawings. These relative terms are for convenience of description only and do not require the present application to be constructed or operated in a specific direction.

[0028] For ease of description, "first", "second", "third", etc. may be used herein to distinguish different components of a figure or a series of figures. "First", "second", "third", etc. are not intended to describe the corresponding components.

[0029] As described in the background art, during the cell liquid injection and formation stages, the inner side of the negative electrode top cover of the prior art is in a state of being soaked by the electrolyte, and the electrolyte will enter the negative electrode terminal inside, resulting in a decrease in the insulation resistance value on the negative electrode side. In certain cases, it is likely to cause abnormal side voltage of the battery and there is a risk of corrosion of the aluminum shell.

[0030] The present utility model provides an electronic device 1000, and the electronic device 1000 includes a battery pack 10. The working part of the electronic device 1000 is electrically connected to the battery pack 1002 to obtain power support. As an example, the electronic device 1000 is a vehicle, which can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc., but not limited thereto. The working part is the vehicle body, and the battery pack 1002 is arranged at the bottom of the vehicle body and provides power support for the running of the vehicle or the operation of the electrical components in the vehicle. However, in some other embodiments, the electronic device 1000 can also be a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy and an electric tool, etc. The spacecraft includes an airplane, a rocket, a space shuttle and a spaceship, etc.; the working part can obtain the electric energy of the battery pack 1002 and is a unit component that performs corresponding work, such as the fan blade rotation unit of a fan, the dust suction working unit of a vacuum cleaner, etc. The electric toy includes a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy and an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and a railway electric tool, for example, an electric drill, an electric grinding wheel, an electric wrench, an electric screwdriver, a hammer drill, an impact electric drill, a concrete vibrator and a planer, etc. The embodiments of the present application do not impose special restrictions on the above-mentioned electronic device 1000.

[0031] For the convenience of description, the following embodiments take the electronic device 1000 as a vehicle as an example for description. Refer to Figure 1 , a battery pack 1002 is arranged inside the vehicle, and the battery pack 1002 can be arranged at the bottom, head or tail of the vehicle body 1001. The battery pack 1002 can be used for the power supply of the vehicle. For example, the battery pack 1002 can be used as the operating power source of the vehicle.

[0032] Figure 2 shows a perspective view of a secondary battery 100 according to an embodiment of the present application, Figure 3 shows a front view of a secondary battery 100 according to an embodiment of the present application, Figure 4 shows a top view of a secondary battery 100 according to an embodiment of the present application, Figure 5 shows along Figure 4 a sectional view taken along line A-A, Figure 6 shows Figure 5 an enlarged view of area B in Figure 7 shows a secondary battery 100 and a liquid injection device 200 according to an embodiment of the present application. It should be understood that due to the angle of the drawing, some surfaces are not shown, and some surfaces only show the lines or a certain side presented by their projections. The reference numerals refer to these projection lines or sides.

[0033] Refer to Figures 2 to 7, embodiments of the present application provide a battery housing 170, including: a housing 110 having a first sidewall 11, a second sidewall 12 opposite to the first sidewall 11, a third sidewall 13 and a fourth sidewall 14 that connect the first sidewall 11 and the second sidewall 12 and are oppositely arranged. The areas of the first sidewall 11 and the second sidewall 12 are larger than those of the third sidewall 13 and the fourth sidewall 14. Therefore, the third sidewall 13 and the fourth sidewall 14 are also called the small faces of the housing 110. A liquid injection hole 132 is provided on the third sidewall 13; a first top cover 21 is connected to the first sidewall 11, the second sidewall 12, the third sidewall 13 and the fourth sidewall 14. The first top cover 21 includes a negative electrode terminal 212, and the distance between the negative electrode terminal 212 and the third sidewall 13 is less than the distance between the negative electrode terminal 212 and the fourth sidewall 14. The liquid injection hole 132 of the embodiment of the present application is provided on the third sidewall 13 that is closer to the negative electrode terminal 212. Therefore, the liquid injection hole 132 and the negative electrode terminal 212 are on the same side. During the processes of injecting liquid, forming, and other production processes of the secondary battery 100, the secondary battery 100 is placed sideways, which can, to a certain extent, prevent the electrolyte from entering the inside of the first top cover 21 where the negative electrode terminal 212 is located, thereby avoiding affecting the insulation resistance value of the first top cover 21 and improving the safety of the battery housing 170 and the secondary battery 100.

[0034] In some embodiments, the battery housing 170 further includes: a second top cover 22, which is oppositely arranged to the first top cover 21 and is connected to the first sidewall 11, the second sidewall 12, the third sidewall 13 and the fourth sidewall 14. The second top cover 22 includes a positive electrode terminal 222, and the distance between the positive electrode terminal 222 and the third sidewall 13 is less than the distance between the positive electrode terminal 222 and the fourth sidewall 14. The liquid injection hole 132 is located on the third sidewall 13 that is closer to the positive electrode terminal 222. Therefore, the liquid injection hole 132 and the positive electrode terminal 222 are on the same side. During the processes of injecting liquid, forming, and other production processes of the secondary battery 100, the secondary battery 100 is placed sideways, which can, to a certain extent, prevent the electrolyte from entering the inside of the second top cover 22 where the positive electrode terminal 222 is located, thereby avoiding affecting the insulation resistance value of the second top cover 22 and improving the safety of the battery housing 170 and the secondary battery 100.

[0035] In some embodiments, the secondary battery 100 is a double-pass battery. In some embodiments, the size of the liquid injection hole 132 is a common industry model, and the specific size is not limited.

[0036] In some embodiments, no liquid injection hole 132 is provided on the first top cover 21 and the second top cover 22. Therefore, the embodiments of the present application avoid the influence on the electrode terminal and the housing caused by setting the liquid injection hole 132 on the top cover as in the prior art.

[0037] In some embodiments, the distance between the liquid injection hole 132 and the first top cover 21 is less than the distance between the liquid injection hole 132 and the second top cover 22. With such an arrangement, the distance between the liquid injection hole 132 and the negative electrode terminal 212 is further increased, and the probability of the electrolyte entering the inner side of the first top cover 21 where the negative electrode terminal 212 is located is reduced, thereby reducing the possibility of the negative insulation resistance being affected.

[0038] In some embodiments, when projected along the direction from the first top cover 21 to the second top cover 22, the negative electrode terminal 212 overlaps with the positive electrode terminal 222. That is to say, during the liquid injection process, the third side wall 13 where the liquid injection hole 132 is located faces upward, and along the vertical direction, the distances between the liquid injection hole 132 and the negative electrode terminal 212 and the positive electrode terminal 222 are the same.

[0039] In some embodiments, the material of the housing 110 is aluminum. In the embodiments of the present application, the liquid injection hole 132 is arranged on the third side wall on the same side as the negative electrode terminal 212, so that the electrolyte is not easily introduced into the negative electrode terminal 212, avoiding the occurrence of abnormal side voltage of the secondary battery 100 and the corrosion of the aluminum housing 110.

[0040] The embodiments of the present application further provide a secondary battery 100, including: the battery housing 170 according to any one of the above; an electrode assembly (bare battery core, laminate) 120, which is accommodated in the battery housing 170. Refer to Figure 6 Furthermore, the secondary battery 100 further includes an insulating bracket 3 located between the second top cover 22 and the electrode assembly 120. The ear avoidance grooves on the insulating bracket 3 are for the positive electrode ears of the electrode assembly 120 to pass through, so that the positive electrode ears in adjacent two ear avoidance grooves do not contact each other, thereby realizing an effective isolation effect on the positive electrode ears, greatly improving the safety of the secondary battery 100. At the same time, the insulating bracket 3 is installed between the second top cover 22 and the electrode assembly 120 and has a supporting effect, further improving the stability of the secondary battery 100. The bottom support plate 91 is arranged between the electrode assembly 120 and the housing 110 to play a role in anti-collision.

[0041] Refer to Figure 7 Furthermore, the embodiments of the present application further provide a liquid injection device 200, which injects electrolyte into the secondary battery 100 through the liquid injection hole 132 according to any one of the above. A plurality of secondary batteries 100 are placed on the tray 700 side by side for liquid injection at the same time.

[0042] The embodiments of the present application further provide a battery pack 1002, including the battery housing 170 according to any one of the above and at least one of the secondary batteries 100.

[0043] The embodiments of the present application further provide an electronic device 1000, including at least one of the battery housing 170 according to any one of the above, the secondary battery 100, and the battery pack 1002.

[0044] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, various modifications and variations can be made to the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A battery casing, characterized in that: include: The housing comprises a first side wall, a second side wall opposite to the first side wall, a third side wall and a fourth side wall connected to the first side wall and opposite to each other, the first side wall and the second side wall having larger areas than the third side wall and the fourth side wall, and a liquid injection hole being arranged on the third side wall; A first top cover connects the first side wall, the second side wall, the third side wall and the fourth side wall, wherein the first top cover comprises a negative pole, and the distance between the negative pole and the third side wall is smaller than the distance between the negative pole and the fourth side wall.

2. The battery housing according to claim 1, characterized in that: Also includes: A second top cover is arranged opposite to the first top cover and connects the first side wall, the second side wall, the third side wall and the fourth side wall, the second top cover includes a positive pole, and the distance between the positive pole and the third side wall is smaller than the distance between the positive pole and the fourth side wall.

3. The battery housing according to claim 2, characterized in that: The first top cover and the second top cover are not provided with a liquid injection hole.

4. The battery housing according to claim 2, characterized in that: The distance between the injection hole and the first top cover is smaller than the distance between the injection hole and the second top cover.

5. The battery housing according to claim 2, characterized in that: Projected along the direction from the first top cover to the second top cover, the negative electrode post overlaps with the positive electrode post.

6. The battery housing according to claim 1, characterized in that: The material of the housing is aluminum.

7. A secondary battery, characterized in that: include: The battery casing according to any one of claims 1 to 6; The electrode assembly is housed in the battery casing.

8. A liquid injection device, characterized in that: The electrolyte is injected into the secondary battery according to claim 7 through the injection hole according to any one of claims 1 to 6.

9. A battery pack, characterized in that: The invention comprises at least one of the battery case according to any one of claims 1 to 6 and the secondary battery according to claim 7.

10. An electronic device, characterized in that: The invention comprises at least one of the battery case according to any one of claims 1 to 6, the secondary battery according to claim 7 and the battery pack according to claim 9.

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