Power battery and battery cover plate assembly thereof

Abstract

The utility model discloses a power battery and a battery cover plate assembly thereof. The battery cover plate assembly comprises a cover plate and a top cover patch, the cover plate comprises a first surface and a second surface which are opposite in the thickness direction, and the first surface of the cover plate is provided with a containing groove extending towards the second surface. The top cover patch is matched with the containing groove in shape, the top cover patch is provided with a back glue layer, and the top cover patch is attached to the interior of the containing groove through the back glue layer. According to the power battery and the battery cover plate assembly thereof, the top cover patch is fixed in the accommodating groove after being assembled and is not easy to move freely under pressure, and meanwhile, the back glue body is arranged in the accommodating groove, so that the back glue of the top cover patch is prevented from overflowing, and glue overflowing caused by pressure, lamination, non-uniform pressure and high-temperature environment is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, concretely relates to a power battery and battery cover plate assembly thereof. BACKGROUND

[0002] Due to the advantages of high energy density, high power density, multiple cycle times and long storage time, power batteries (such as lithium ion batteries) are widely used in portable electronic devices such as mobile phones, digital video cameras and laptop computers, and have a wide application prospect in electric vehicles, electric bicycles and other electric vehicles and energy storage facilities, and become the key to solving global problems such as energy crisis and environmental pollution.

[0003] The power battery generally includes a battery cell, a shell accommodating the battery cell, and a top cover sealedly installed on the shell. After the power battery is assembled, a top cover patch is usually attached to the top cover. On the one hand, it can play an insulating role to prevent the top cover patch from being short-circuited with external lines, and on the other hand, it can play a protective role to prevent the top cover patch from being scratched and damaged.

[0004] However, the existing top cover patch is flush with the base material, which causes the back adhesive body of the top cover patch to be flush with the base material. After assembly, under different environmental temperature differences, the back adhesive body is caused to overflow and adhere to dirt under pressure, resulting in poor appearance of the battery. UTILITY MODEL CONTENTS

[0005] Therefore, it is necessary to provide a power battery and a battery cover plate assembly to solve the problem that the back adhesive body of the top cover patch overflows and adheres to dirt under pressure after the existing top cover patch is assembled with the top cover.

[0006] A battery cover plate assembly comprises:

[0007] A cover plate comprises a first surface and a second surface opposite in the thickness direction, and the first surface of the cover plate is provided with a receiving groove extending toward the second surface; and

[0008] A top cover patch is matched with the shape of the receiving groove, the top cover patch is provided with a back adhesive layer, and the top cover patch is attached to the receiving groove through the back adhesive layer.

[0009] In one embodiment, the sum of the back adhesive layer and the thickness of the top cover patch is greater than or equal to the depth of the receiving groove.

[0010] In one embodiment, the bottom wall of the receiving groove is provided with a first boss, a pole is installed in the first boss, and the top cover patch is provided with a first perforation for the first boss to pass through.

[0011] In one of the embodiments, the bottom wall of the accommodating groove is provided with a second boss, an explosion-proof valve is installed in the second boss, and the top cover patch is provided with a second through hole for the second boss to pass through.

[0012] In one of the embodiments, the first boss is flush with the first surface, and the second boss is higher than the first surface.

[0013] In one of the embodiments, the bottom wall of the accommodating groove is provided with a liquid injection hole, the liquid injection hole penetrates the second surface of the cover plate, and the top cover patch is provided with a window exposing the liquid injection hole.

[0014] In one of the embodiments, a lower plastic part is further included, and the lower plastic part is installed on the second surface of the cover plate.

[0015] In one of the embodiments, the top cover patch is gap-fitted with the accommodating groove, and the single-side gap is 0.05 mm.

[0016] In one of the embodiments, the distance between the side wall of the accommodating groove and the side wall of the cover plate is greater than 1 mm, the thickness of the top cover patch is 0.1-0.2 mm, and the thickness of the back adhesive body is 0.05-0.15 mm.

[0017] A power battery comprises:

[0018] The battery cover plate assembly according to any one of the preceding embodiments.

[0019] The power battery and the battery cover plate assembly thereof have at least the following advantages:

[0020] The first surface of the cover plate is provided with an accommodating groove, the top cover patch is attached to the accommodating groove through a back adhesive layer, the top cover patch is fixed in the accommodating groove after assembly and is not easily moved under pressure, and meanwhile, the back adhesive body is in the accommodating groove, so that overflow of the back adhesive of the top cover patch is avoided, and overflow of the back adhesive due to pressure, lamination, uneven pressure and high temperature environment is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present application, the drawings required in the specific embodiments will be briefly introduced below. In all the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0022] Figure 1 It is a structural schematic view of the battery cover plate assembly in an embodiment.

[0023] Figure 2 It is a structural schematic view of the battery cover plate assembly in an embodiment. Figure 1 It is an enlarged view of part A in the embodiment.

[0024] Figure 3 It is a structural schematic view of the battery cover plate assembly in an embodiment. Figure 1A top view of the battery cover plate assembly shown;

[0025] Figure 4 For Figure 3 A sectional view along line A-A in the middle;

[0026] Figure 5 For Figure 4 An enlarged view of a portion at B in the middle.

[0027] Reference signs:

[0028] 10 - cover plate, 11 - first surface, 12 - second surface, 13 - accommodating groove, 14 - first boss, 15 - second boss, 20 - top cover patch, 22 - window, 31 - positive pole, 32 - negative pole, 40 - explosion-proof valve, 50 - liquid injection hole, 60 - lower plastic part. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned purposes, features and advantages of the present application more apparent and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, a large number of specific details are set forth in order to fully understand 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 departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0030] It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. The terms "vertical", "horizontal", "left", "right", "front", "back", and similar terms as used herein are for the purpose of illustration only and are not intended to be limiting.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0032] At present, from the development of market situation, the application of power battery is more and more widely. The power battery is not only applied to the energy storage power supply system of water power, fire power, wind power and solar power station, but also widely applied to electric bicycle, electric motorcycle, electric vehicle and other electric vehicles and other fields. With the continuous expansion of the application field of power battery, the market demand is also increasing.

[0033] The power battery comprises a shell, a top cover and an electrode assembly, the electrode assembly is accommodated in the shell, and the top cover is covered on the shell to seal the electrode assembly in the shell. The top cover is provided with a liquid injection port, electrolyte is injected into the shell through the liquid injection port, and the electrolyte can soak the electrode assembly.

[0034] After the power battery is assembled, an insulating film is usually wrapped on the outer surface of the power battery. On the one hand, the insulating film can play an insulating role to prevent the metal shell from being short-circuited with an external circuit, and on the other hand, the insulating film can play a protective role to prevent the metal shell from being abraded and scratched. In addition, since the top cover of the battery needs to lead out a pole, the insulating film cannot completely wrap the top cover of the battery, and therefore a top cover patch is usually attached to the top cover of the battery. The top cover patch has the same functions as the insulating film, that is, the top cover patch also plays an insulating and protective role.

[0035] However, the existing top cover patch is designed to be flush with the substrate, so that the back adhesive body of the top cover patch is also flush with the substrate. After assembly, under different environmental temperature differences and pressure, the adhesive of the back adhesive body overflows, adheres dirt, and causes the appearance of the battery to be poor.

[0036] In view of this, in order to solve the above problems, the battery cover plate assembly is provided, the existing cover plate structure is designed as a counterbore structure, and the top cover patch is fixed in the cover plate counterbore after assembly, so that the top cover patch is not easily moved under pressure, and the overflow of the back adhesive of the top cover patch is avoided.

[0037] In order to better understand the technical scheme and beneficial effects of the present application, the present application will be further described in detail below in combination with specific embodiments:

[0038] The power battery in an embodiment comprises a battery cover plate assembly as shown in Figure 1 The battery cover plate assembly comprises a cover plate 10 and a top cover patch 20.

[0039] The cover plate 10 is a sheet material and has a sheet structure. The specific structure is not fixed, and the applicability is adjusted according to the specific design structure of different batteries. For example, the cover plate 10 can be a narrow strip / long strip structure, or can also be made into a square or a circle, etc. The material of the cover plate 10 can be made of metal material, such as steel sheet material, aluminum sheet material, etc., or can also be made of alloy or composite plastic as the cover plate 10, which is not limited here.

[0040] Please refer to Figure 2The cover plate 10 includes a first surface 11 and a second surface 12 opposite in the thickness direction, wherein the first surface 11 is the surface of the cover plate 10 away from the battery cell, and the second surface 12 is the surface close to the battery cell. The first surface 11 is provided with a receiving groove 13 extending to the second surface 12 by a certain depth. In an embodiment, the spacing between the side wall of the receiving groove 13 and the side wall of the cover plate 10 is greater than 1mm, so as to reserve a margin for subsequent laser welding between the cover plate 10 and the shell.

[0041] Please refer to Figure 3 and Figure 4 The top cover patch 20 is matched with the shape of the receiving groove 13, and the top cover patch 20 is provided with an adhesive layer, and the top cover patch 20 is attached in the receiving groove 13 through the adhesive layer. After assembly, the top cover patch 20 is fixed in the receiving groove 13 and is not easy to move under pressure, and the adhesive is in the receiving groove 13, which avoids overflow of the adhesive of the top cover patch 20, and prevents overflow of the adhesive due to pressure, lamination, uneven pressure and high temperature environment.

[0042] In an embodiment, the top cover patch 20 is gap-fitted with the receiving groove 13, which facilitates installation of the top cover patch 20 in the receiving groove 13. The single-side gap between the top cover patch 20 and the receiving groove 13 is 0.05mm. That is, the gap between the side wall of the top cover patch 20 and the side wall of the receiving groove 13 is 0.05mm. Of course, the gap between the top cover patch 20 and the receiving groove 13 can also be other values, or the spacing between each side of the top cover patch 20 and the receiving groove 13 is not completely the same.

[0043] Please refer to Figure 5 In an embodiment, the sum of the thickness of the adhesive layer and the top cover patch 20 is greater than the depth of the receiving groove 13. That is, after the top cover patch 20 is installed in the receiving groove 13 of the top cover, the top cover patch 20 is flush with the first surface 11 of the top cover, or the top cover patch 20 is higher than the first surface 11 of the top cover. In an embodiment, the thickness of the top cover patch 20 is 0.1-0.2mm, and the thickness of the adhesive is 0.05-0.15mm.

[0044] In an embodiment, the bottom wall of the receiving groove 13 is provided with a first boss 14, the first boss 14 is provided with a pole, and the top cover patch 20 is provided with a first through hole for the first boss 14 to pass through. Specifically, since the battery has a positive electrode and a negative electrode, the first boss 14 is provided with two, and the two first bosses 14 are distributed on the cover plate 10 with a spacing, and the positive pole 31 and the negative pole 32 pass out of the two first bosses 14 respectively. The first boss 14 is not only used to realize the passing out of the positive electrode and the negative electrode, but also cooperates with the first through hole to realize positioning during installation of the top cover patch 20, thereby improving the installation efficiency of the top cover patch 20.

[0045] In an embodiment, the bottom wall of the accommodating groove 13 is provided with a second boss 15, an explosion-proof valve 40 is installed in the second boss 15, and the top cover patch 20 is provided with a second through hole for the second boss 15 to pass through. Specifically, the second boss 15 is arranged between the two first bosses 14. Among them, since a large amount of chemical substances are contained in the battery, gas will be generated during the use of charging and discharging of the battery, so that the pressure in the battery continues to accumulate, and if the pressure is not released, the battery will explode and cause serious consequences. The explosion-proof valve 40 can timely release the pressure of the battery to prevent the battery from exploding.

[0046] On the basis of the above embodiment, further, the top surface of the first boss 14 is flush with the first surface 11. That is, during the processing of the accommodating groove 13 on the cover plate 10, the material reserved on the first boss 14 is directly processed to form the first boss 14 and the second boss 15 after the processing of the accommodating groove 13 is completed, thereby improving the processing efficiency of the battery cover plate assembly. The top surface of the second boss 15 is higher than the first surface 11, and the material thickness at the installation position of the explosion-proof valve 40 is relatively thick, which can facilitate the installation of the explosion-proof valve 40 and ensure the stable installation of the explosion-proof valve 40.

[0047] In an embodiment, the bottom wall of the accommodating groove is provided with a liquid injection hole 50, the liquid injection hole 50 penetrates the second surface 12 of the cover plate 10, electrolyte is injected into the inside of the shell through the liquid injection hole 50, so that the electrolyte can soak the battery cell assembly. After the electrolyte is injected, the liquid injection hole 50 needs to be sealed by welding with sealing nails to form a sealed space in the inside of the shell.

[0048] In the embodiment, the top cover patch 20 is provided with a window 22 exposing the liquid injection hole 50, so as to facilitate the liquid injection operation in the outside. The top cover patch 20 is provided with a window 22 exposing the positive and negative electrodes on the cover plate 10, so as to facilitate the personnel to identify the positive and negative electrodes of the battery.

[0049] In an embodiment, the battery cover plate assembly further comprises a lower plastic part 60 installed on the second surface 12 of the cover plate 10, the lower plastic part 60 is used to separate the cover plate 10 from the battery cell assembly to realize the insulation between the cover plate 10 and the battery cell assembly. The top cover patch 20 is provided with a window 22 exposing the positive and negative electrodes on the cover plate 10, so as to facilitate the personnel to identify the positive and negative electrodes of the battery.

[0050] The power battery and the battery cover plate assembly thereof, the first surface 11 of the cover plate 10 is provided with an accommodating groove 13, the top cover patch 20 is attached to the accommodating groove 13 through the back adhesive layer, the top cover patch 20 is fixed in the accommodating groove 13 after assembly, and is not easy to move under pressure. At the same time, the back adhesive is in the accommodating groove 13, which avoids the overflow of the back adhesive of the top cover patch 20, and prevents the overflow caused by pressure, lamination, uneven pressure and high temperature environment.

[0051] The above examples are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can still be modified, or some or all of the technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application.

Claims

1. A battery cover plate assembly, characterized by, The battery cover plate assembly comprises: a cover plate comprising a first surface and a second surface opposite to each other in the thickness direction, the first surface of the cover plate being provided with a receiving groove extending to the second surface; and a top cover patch matching the shape of the receiving groove, the top cover patch being provided with an adhesive layer, and the top cover patch being attached to the receiving groove through the adhesive layer. The sum of the thickness of the adhesive layer and the top cover patch is greater than or equal to the depth of the receiving groove.

2. The battery cover plate assembly of claim 1, wherein, The bottom wall of the receiving groove is provided with a first boss, the first boss being provided with a polar column, and the top cover patch is provided with a first through hole for the first boss.

3. The battery cover plate assembly of claim 1, wherein, The bottom wall of the receiving groove is provided with a second boss, the second boss being provided with an explosion-proof valve, and the top cover patch is provided with a second through hole for the second boss.

4. The battery cover plate assembly of claim 3, wherein, The first boss is flush with the first surface, and the second boss is higher than the first surface.

5. The battery cover plate assembly of claim 4, wherein, The bottom wall of the receiving groove is provided with a liquid injection hole, the liquid injection hole penetrating the second surface of the cover plate, and the top cover patch is provided with a window exposing the liquid injection hole.

6. The battery cover plate assembly of claim 1, wherein, Further comprising a lower plastic part mounted on the second surface of the cover plate.

7. The battery cover plate assembly of any one of claims 1-6, wherein, The top cover patch and the receiving groove are gap-fitted, and the single-side gap is 0.05 mm.

8. The battery cover plate assembly of any one of claims 1-6, wherein, The distance between the side wall of the receiving groove and the side wall of the cover plate is greater than 1 mm, the thickness of the top cover patch is 0.1-0.2 mm, and the thickness of the adhesive layer is 0.05-0.15 mm.

9. The battery cover plate assembly of any one of claims 1-6, wherein, The battery cover plate assembly comprises:

10. A power cell, characterized by The battery cover plate assembly according to any one of claims 1-9. ​

Images