Battery module

Abstract

The utility model discloses a battery module, and relates to the technical field of energy storage. The battery module comprises a battery cell and a protection plate, the battery cell is provided with a pole, the battery cell is provided with a first side face, the pole is located on the first side face, the protection plate is arranged on the first side face, the protection plate is provided with a bearing face used for bearing electronic components, the bearing face faces the first side face, and the first side face faces the first side face. And the protection plate is electrically conducted with the pole. According to the scheme, the problem that the size of the current battery module is relatively large can be solved.

Description

Technical Field

[0001] The present application belongs to the field of energy storage technology, and specifically relates to a battery module. Background Art

[0002] With the continuous miniaturization and diversification of functions of electronic devices, users have higher and higher requirements for the capacity of the power supply of electronic devices, that is, the battery module, to ensure the battery life of electronic devices. Usually, after the protection board of the battery module is installed, it is necessary to use hot melt adhesive to encapsulate the exposed electronic components on the protection board. However, since the electronic components have a certain height, the hot melt adhesive needs to completely cover the entire electronic components, which results in a larger size of the battery module after encapsulation. Utility Model Content

[0003] The purpose of the embodiments of the present application is to provide a battery module that can solve the problem of large size of current battery modules.

[0004] In order to solve the above technical problems, this application is implemented as follows:

[0005] In a first aspect, an embodiment of the present application provides a battery module, comprising a battery cell and a protection plate, wherein the battery cell has a pole, the battery cell is provided with a first side surface, the pole is located on the first side surface, the protection plate is arranged on the first side surface, the protection plate is provided with a carrying surface for carrying electronic components, the carrying surface faces the first side surface, and the protection plate is electrically connected to the pole.

[0006] In the embodiment of the present application, the protection board is electrically connected to the pole of the battery cell, and the protection board is provided with a bearing surface for bearing electronic components, and the bearing surface faces the first side of the battery cell, that is, the electronic components arranged on the protection board are located between the protection board and the battery cell. Since the pole has a certain height, there must be a certain gap between the protection board and the battery cell. By arranging the electronic components on the side of the protection board facing the battery cell, compared with the prior art that arranges the electronic components on the side of the protection board away from the battery cell, the electronic components can be avoided from being exposed. Therefore, after the protection board is installed, there is no need to use hot melt adhesive to encapsulate the electronic components on the side of the protection board away from the battery cell, thereby reducing the size of the battery module. Therefore, the present application can solve the problem of the current large size of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 An exploded view of a battery module disclosed in an embodiment of the present application;

[0008] Figures 2 to 7 It is a schematic diagram of the structure corresponding to each process in the assembly process of the battery module disclosed in the embodiment of the present application;

[0009] Figure 8A cross-sectional view of a battery module disclosed in an embodiment of the present application;

[0010] Figures 9 and 10 Schematic diagram of the structure of the battery module disclosed in the embodiment of the present application at different viewing angles.

[0011] Description of reference numerals:

[0012] 100 - battery cell, 110 - pole, 120 - first side surface, 130 - second side surface;

[0013] 200-protection plate, 210-bearing surface, 220-main board, 221-first surface, 230-connecting portion, 231-conducting portion, 232-second surface, 233-third surface, 240-first reinforcing plate, 250-second reinforcing plate, 260-third reinforcing plate;

[0014] 300-Electronic components;

[0015] 400-buffer, 410-avoidance hole, 420-tape, 421-main body, 422-extension part, 430-foam;

[0016] 500-outer adhesive tape;

[0017] 600-encapsulation layer;

[0018] 700-Metal connector. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0020] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0021] The battery module provided in the embodiment of the present application is described in detail below through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0022] like Figures 1 to 10 As shown, the embodiment of the present application provides a battery module. Optionally, the battery module can be a lithium battery module, and of course it can also be other types of batteries, such as a nickel-cadmium battery module, a nickel-metal hydride battery module, etc., and the embodiment of the present application does not impose specific restrictions on this. The battery module includes a battery cell 100 and a protection plate 200. Optionally, the battery cell 100 can be a steel shell battery cell, and of course it can also be an aluminum shell battery cell, and there is no specific restriction on this; Optionally, the battery cell 100 can be a square structure for easy manufacturing. The battery cell 100 has a pole 110, and the pole 110 here includes a positive pole and a negative pole. The battery cell 100 is provided with a first side 120, and the pole 110 is located on the first side 120. The protection plate 200 is arranged on the first side 120. The protection plate 200 is provided with a bearing surface 210 for carrying electronic components 300. The electronic components here specifically include thermal switches, overcurrent protectors, resistors, capacitors and other devices. The bearing surface 210 faces the first side surface 120 , and the protection plate 200 is electrically connected to the pole 110 .

[0023] In the embodiment of the present application, the protection plate 200 is electrically connected to the pole 110 of the battery cell 100, and the protection plate 200 is provided with a carrying surface 210 for carrying the electronic component 300, and the carrying surface 210 faces the first side surface 120 of the battery cell 100, that is, the electronic component 300 arranged on the protection plate 200 is located between the protection plate 200 and the battery cell 100. Since the pole 110 has a certain height, there must be a certain gap between the protection plate 200 and the battery cell 100. By arranging the electronic component 300 on the side of the protection plate 200 facing the battery cell 100, compared with the prior art in which the electronic component 300 is arranged on the side of the protection plate 200 away from the battery cell 100, the electronic component 300 can be avoided from being exposed. Therefore, after the protection plate 200 is installed, there is no need to use hot melt adhesive to encapsulate the electronic component 300 on the side of the protection plate 200 away from the battery cell 100, thereby reducing the size of the battery module; at the same time, the amount of hot melt adhesive can also be reduced to save costs. Therefore, the present application can solve the problem of the current large size of the battery module.

[0024] In an optional embodiment, the battery module also includes a buffer member 400, which is arranged on the battery cell 100. The buffer member 400 is provided with an avoidance hole 410 for avoiding the pole 110. One end of the pole 110 passes through the avoidance hole 410 and is electrically connected to the protection plate 200. Optionally, the shape of the avoidance hole 410 can be adapted to the cross-sectional shape of the pole 110; optionally, the shape of the avoidance hole 410 can be circular, rectangular, etc., and the embodiment of the present application does not impose any specific restrictions on this. At least part of the buffer 400 is located between the first side surface 120 and the electronic component 300 to prevent the electronic component 300 from contacting the battery cell 100, thereby protecting the electronic component 300. Furthermore, compared with the prior art in which a silicone pad is provided between the protective plate 200 and the battery cell 100 to support the protective plate 200, this solution not only utilizes the space between the protective plate 200 and the battery cell 100 to accommodate the electronic component 300, but also fixes the electronic component 300 by providing the buffer 400. In addition, the buffer 400 itself has a certain deformation performance, which can avoid damage to the electronic component 300.

[0025] Optionally, the buffer 400 may be a foam plastic (such as expandable polystyrene (EPS), expandable polyethylene (EPE), rubber, etc.); or, in other embodiments, the buffer 400 includes a foam 430, which has a certain elasticity, and also has the characteristics of light weight, ultra-thin volume, reliable performance, etc.; Optionally, the foam 430 may be a PU (Poly urethane) foam, which has the characteristics of heat insulation, sound absorption, shock absorption, flame retardancy, anti-static, good air permeability, etc. The foam 430 is bonded to the battery cell 100, and the foam 430 faces the electronic component 300. At this time, the connection area between the foam 430 and the battery cell 100 is small. When the battery cell 100 is working and dissipating heat, the glue used to bond the foam 430 is easy to melt, and the foam 430 is easy to move. Based on this, optionally, the buffer 400 also includes adhesive tape 420. Optionally, the adhesive tape 420 may be PI adhesive tape. (Polyimide, polyimide foam), which has good sealing, adhesion, softness, toughness and compactness. Foam 430 is arranged on adhesive tape 420. Optionally, foam 430 and adhesive tape 420 can be an integrated structure. Adhesive tape 420 is attached to battery cell 100, and both adhesive tape 420 and foam 430 are provided with avoidance holes 410. In this solution, foam 430 is fixed to battery cell 100 by adhesive tape 420. At this time, the connection area between buffer 400 and battery cell 100 is larger, and the stability of foam 430 is better.

[0026] Optionally, the sum of the thickness of the foam 430 and the thickness of the adhesive tape 420 may be equal to or slightly greater than the distance between the electronic component 300 and the first side surface 120 of the battery cell 100 .

[0027] Optionally, the number of foams 430 may be one, in which case each electronic component 300 is arranged opposite to the same foam 430; or, in other embodiments, the number of foams 430 may be at least two, and each foam 430 is arranged at intervals on the adhesive tape 420, and each foam 430 is arranged one-to-one with each electronic component 300. In this case, foams 430 of different heights can be set for electronic components 300 of different heights, so that different foams 430 can better adapt to different electronic components 300.

[0028] In another optional embodiment, in the direction perpendicular to the first side surface 120, the orthographic projection of the foam 430 covers the orthographic projection of the electronic component 300, that is, the contour line of the orthographic projection of the electronic component 300 is located within the contour line of the orthographic projection of the foam 430. At this time, it can be ensured that the foam 430 fully protects the electronic component 300 disposed on the protection plate 200, and even if the protection plate 200 moves slightly relative to the battery cell 100, the electronic component 300 disposed on the protection plate 200 can still be opposite to the foam 430 and protected by the foam 430. Of course, in the direction perpendicular to the first side surface 120, the orthographic projection of the foam 430 can be equal to the orthographic projection of the electronic component 300.

[0029] In another optional embodiment, the battery cell 100 is further provided with a second side surface 130 adjacent to the first side surface 120, and the adhesive tape 420 includes a main body portion 421 and an extension portion 422 connected to each other, the main body portion 421 is attached to the first side surface 120, and the extension portion 422 is attached to the second side surface 130. In this case, the connection area between the adhesive tape 420 and the battery cell 100 can be increased, the connection stability of the adhesive tape 420 can be improved, and the adhesive tape attached to the first side surface 120 can be prevented from warping due to the heat emitted by the protective plate 200 during operation. Of course, the extension portion 422 can also be omitted, and only the main body portion 421 can be provided on the first side surface 120.

[0030] Optionally, when the battery cell 100 is a cube structure or a rectangular parallelepiped structure, the number of the second side surfaces 130 is four, and the number of the extension portions 422 may be at least two, thereby further improving the bonding stability of the adhesive tape 420 .

[0031] In a further optional embodiment, the battery module further includes an outer adhesive tape 500. Optionally, the outer adhesive tape 500 may be a trademark paper; optionally, the outer adhesive tape 500 may be an insulating adhesive tape. When the battery cell 100 generates a large current, the insulating adhesive tape may protect the battery cell 100, thereby preventing the battery cell 100 from short-circuiting; in addition, the insulating adhesive tape may prevent the battery module from generating friction during vibration and damaging the battery cell 100; further optionally, the insulating adhesive tape may be made of highland barley paper, and of course, may also be made of other materials, which is not specifically limited here. The outer adhesive tape 500 wraps the battery cell 100, and the outer adhesive tape 500 covers at least part of the extension 422. At this time, the outer adhesive tape 500 and the adhesive tape 420 of the buffer 400 may be partially overlapped, thereby further improving the bonding firmness of the buffer 400.

[0032] In another optional embodiment, the battery module further includes a packaging layer 600. Optionally, the packaging layer 600 may be an insulating structure. The packaging layer 600 fills the gap between the bearing surface 210 and the first side surface 120 to cover the pole 110 and the electronic components 300, thereby fixing and protecting the pole 110 and the electronic components 300. Optionally, the packaging layer 600 may be a hot melt adhesive. After the protection plate 200 is installed, the hot melt adhesive may be poured into the gap between the protection plate 200 and the first side surface 120 of the battery cell 100. The hot melt adhesive solidifies after cooling to form the packaging layer 600. Optionally, in the process of packaging the pole 110 and the electronic components 300, a low-pressure injection molding method may be used, which has the characteristics of short process cycle, high yield rate, and good waterproof sealing. Optionally, during the injection molding process, a hot melt adhesive with better bonding with the product, such as hot melt adhesives with models 861B and 630, may be selected to better bond the edge of the protective plate 200 with the hot melt adhesive, thereby improving the reliability of the battery module.

[0033] Optionally, in order to meet the requirement of full glue flow during the injection molding process, the thickness of the encapsulation layer 600 can be 0.25 to 0.3 mm. Of course, it can also be flexibly selected according to actual needs, and the embodiments of the present application do not impose specific restrictions on this.

[0034] In an optional embodiment, the protection plate 200 includes a main board 220 and a connecting portion 230 connected to each other. The main board 220 is a long strip structure. In the width direction of the main board 220, the connecting portion 230 is arranged side by side with the main board 220. The main board 220 has a bearing surface 210. The edge of the main board 220 is spot-welded to the edge of the first side surface 120. At this time, the main board 220 and the outer shell of the battery cell 100 do not need to be punched, which is conducive to improving the structural strength of the main board 220 and the outer shell of the battery cell 100. Optionally, the connecting portion 230 has a conducting portion 231 for electrically conducting with an external structure, that is, the connecting portion 230 protrudes from the main board 220, and the conducting portion 231 is arranged on the connecting portion 230, so that the conducting portion 231 is electrically conducting with the external structure. Of course, the connecting portion 230 can also be omitted, and the conducting portion 231 can be arranged on the side of the main board 220 away from the battery cell 100.

[0035] Optionally, the protection plate 200 also includes a first reinforcing plate 240 and a second reinforcing plate 250, and the main board 220 is also provided with a first surface 221 opposite to the bearing surface 210, and the first reinforcing plate 240 is arranged on the first surface 221, that is, the electronic component 300 and the first reinforcing plate 240 are respectively arranged on two opposite sides of the main board 220, thereby improving the structural strength of the main board 220; the connecting part 230 has a second surface 232 and a third surface 233 arranged opposite to each other, the second surface 232 is provided with a conducting part 231, and the third surface 233 is provided with a second reinforcing plate 250, that is, the conducting part 231 and the second reinforcing plate 250 are respectively arranged on two opposite sides of the connecting part 230, thereby improving the structural strength of the connecting part 230.

[0036] Optionally, the protection plate 200 also includes a third reinforcing plate 260, which is arranged on the bearing surface 210. One end of the electronic component 300 is connected to the main board 220 through a through hole on the third reinforcing plate 260. The third reinforcing plate 260 can be used to further enhance the structural strength of the main board 220 and can fix the electronic component 300, thereby improving the stability of the electronic component 300.

[0037] In a further optional embodiment, the connection portion 230 is bent relative to the main board 220. Optionally, the connection portion 230 can be perpendicular to the main board 220. The connection portion 230 is located on the side of the main board 220 away from the battery cell 100, that is, the battery cell 100, the main board 220 and the connection portion 230 are arranged in sequence along a direction perpendicular to the bearing surface 210. At this time, the protective plate 200 occupies a smaller space in the thickness direction of the battery cell 100. When the battery module is installed in an electronic device, it is conducive to the thinness of the electronic device. Optionally, in the length direction of the main board 220, the connection portion 230 protrudes from the main board 220, and the conductive portion 231 is located at one end of the connection portion 230 away from the main board 220. At this time, the conductive portion 231 can avoid the battery cell 100, thereby further facilitating the electrical connection of the conductive portion 231 with the external structure.

[0038] In an optional embodiment, the battery module further includes a metal connector 700, which is connected between the bearing surface 210 and the pole 110 to make the protection plate 200 electrically conductive with the battery cell 100. Optionally, the metal connector 700 can be a copper structure, such as a copper column, a copper core ball, etc.; or, in other embodiments, the metal connector 700 is a nickel sheet. Since the nickel sheet has ductility, it is conducive to the flexible connection between the protection plate 200 and the pole 110. In addition, the nickel sheet also has the characteristics of corrosion resistance, oxidation resistance, and low price. In addition, the nickel sheet and the electronic components 300 are both arranged on the same side of the protection plate 200, which can reduce the single reflow of the welding nickel sheet, thereby improving the bonding strength of the welding nickel sheet and increasing the product reliability of the battery module.

[0039] Based on the battery module disclosed in this application, in the actual process of assembling the battery module, the specific steps are as follows:

[0040] First, attach the buffer 400 to the battery cell 100, then fix the protection plate 200 to the edge of the first side 120 of the battery cell 100 by spot welding, and make the protection plate 200 electrically connected to the pole 110 through the metal connector 700, then fold the protection plate 200 so that the electronic components 300 on the protection plate 200 are opposite to the buffer 400, and then pour hot melt adhesive into the gap between the protection plate 200 and the first side 120 of the battery cell 100 to cover the pole 110 and the electronic components 300. After the hot melt adhesive is cooled, a packaging layer 600 is formed, and finally the outer adhesive tape 500 is attached to the battery cell 100.

[0041] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A battery module, characterized in that: The invention comprises a battery cell (100) and a protective plate (200), wherein the battery cell (100) has a pole (110), the battery cell (100) is provided with a first side surface (120), the pole (110) is located on the first side surface (120), the protective plate (200) is arranged on the first side surface (120), the protective plate (200) is provided with a bearing surface (210) for bearing an electronic component (300), the bearing surface (210) faces the first side surface (120), and the protective plate (200) is electrically connected to the pole (110).

2. The battery module according to claim 1, characterized in that: The battery module further comprises a buffer component (400), the buffer component (400) being arranged on the battery cell (100), the buffer component (400) being provided with an escape hole (410) for escaping the pole (110), one end of the pole (110) passing through the escape hole (410) being electrically connected to the protection plate (200), and at least a portion of the buffer component (400) being located between the first side surface (120) and the electronic component (300).

3. The battery module according to claim 2, characterized in that: The buffer (400) comprises adhesive tape (420) and foam (430), wherein the foam (430) is arranged on the adhesive tape (420), the adhesive tape (420) is attached to the battery core (100), the foam (430) faces the electronic component (300), and the adhesive tape (420) and the foam (430) are both provided with the avoidance hole (410).

4. The battery module according to claim 3, characterized in that: In a direction perpendicular to the first side surface (120), the orthographic projection of the foam (430) covers the orthographic projection of the electronic component (300).

5. The battery module according to claim 3, characterized in that: The battery cell (100) is also provided with a second side surface (130) adjacent to the first side surface (120); the adhesive tape (420) comprises a main body portion (421) and an extension portion (422) connected to each other; the main body portion (421) is attached to the first side surface (120), and the extension portion (422) is attached to the second side surface (130).

6. The battery module according to claim 5, characterized in that: The battery module further comprises an outer adhesive tape (500), wherein the outer adhesive tape (500) wraps the battery core (100), and the outer adhesive tape (500) covers at least a portion of the extension portion (422).

7. The battery module according to claim 1, characterized in that: The battery module further comprises a packaging layer (600), wherein the packaging layer (600) fills a gap between the bearing surface (210) and the first side surface (120) to cover the pole (110) and the electronic component (300).

8. The battery module according to claim 1, characterized in that: The protection plate (200) comprises a main board (220) and a connecting portion (230) which are connected to each other. The main board (220) is a long strip structure. In the width direction of the main board (220), the connecting portion (230) and the main board (220) are arranged side by side. The main board (220) has the bearing surface (210). The edge of the main board (220) is spot-welded to the edge of the first side surface (120). The connecting portion (230) has a conducting portion (231) for electrically conducting with an external structure.

9. The battery module according to claim 8, characterized in that: The connecting portion (230) is bent relative to the main board (220), the connecting portion (230) is located on a side of the main board (220) away from the battery cell (100), and in the length direction of the main board (220), the connecting portion (230) protrudes from the main board (220), and the conducting portion (231) is located at an end of the connecting portion (230) away from the main board (220).

10. The battery module according to claim 1, characterized in that: The battery module also includes a metal connector (700), which is connected between the bearing surface (210) and the pole (110) to enable electrical conduction between the protection plate (200) and the battery cell (100), and the metal connector (700) is a nickel sheet.

Images