Battery housing and battery assembly

Abstract

This application discloses a battery housing and a battery assembly, relating to the field of battery housing design technology. The battery housing includes a connected housing body and a buffer structure. The housing body has a receiving space for accommodating battery cells, and the buffer structure is disposed on the outer peripheral surface of the housing body. In the event of a drop, the buffer structure can deform. This solution addresses the problem of poor impact resistance in current battery housings.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to a battery housing and a battery assembly. Background Technology

[0002] Battery modules, as power supply devices for electronic devices, provide electrical energy for the normal operation of these devices. A battery module mainly consists of battery cells, a protection board, and a housing. The battery cells store and release electrical energy, the protection board provides overcharge, over-discharge, and short-circuit protection for the battery module, and the housing secures the battery cells, preventing them from shaking and providing good heat dissipation.

[0003] However, the current battery module frames have poor impact resistance. In drop tests, the frames are prone to breakage due to impact, and the corners of the cells may even be squeezed and deformed. This will affect the safety and reliability of the battery module in later use. Utility Model Content

[0004] The purpose of this application is to provide a battery housing and battery assembly that can solve the problem of poor impact resistance of current battery housings.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows:

[0006] In a first aspect, embodiments of this application provide a battery housing, including a housing body and a buffer structure connected together. The housing body has a receiving space for accommodating battery cells, and the buffer structure is disposed on the outer peripheral surface of the housing body.

[0007] The buffer structure can deform in the event of an electronic device being dropped.

[0008] Secondly, embodiments of this application also provide a battery assembly, including a battery cell and the aforementioned battery frame, wherein the battery frame is disposed around the battery cell.

[0009] In this embodiment, the battery housing includes a housing body and a buffer structure connected together. The housing body has a housing space for accommodating the battery cell, and the buffer structure is disposed on the outer peripheral surface of the housing body. When the electronic device is in a drop state, the buffer structure can deform.

[0010] Compared to existing technologies, the battery housing in this application improves its impact resistance by providing a buffer structure on the outer periphery of the housing body. When an electronic device is dropped, the battery component inside the device is impacted. The buffer structure of the battery housing deforms to absorb the impact force on the battery component, thereby protecting the housing body and the battery cells housed within it. Therefore, this application solves the problem of poor impact resistance in current battery housings. Attached Figure Description

[0011] Figures 1 to 2 This is a schematic diagram showing the battery housing structure disclosed in the embodiments of this application in different states;

[0012] Figure 3 This is a schematic diagram of the buffer structure disclosed in the embodiments of this application;

[0013] Figure 4 This is a schematic diagram of a portion of the structure of the frame body disclosed in the embodiments of this application;

[0014] Figure 5 This is a schematic diagram of the structure of the frame body disclosed in the embodiments of this application;

[0015] Figure 6 This is a partial structural schematic diagram of the battery housing disclosed in an embodiment of this application.

[0016] Explanation of reference numerals in the attached figures:

[0017] 100 - Frame body, 110 - Accommodation space, 120 - First edge, 130 - Second edge, 140 - First accommodating groove, 150 - Second accommodating groove;

[0018] 200-Buffer structure, 210-First extension section, 220-Second extension section, 230-Deformation space, 240-Inner elastic wall, 250-Outer elastic wall, 251-First straight section, 252-Arc segment, 253-Second straight section, 260-First connecting part, 270-Second connecting part, 280-Reinforcing rib, 281-First connecting section, 282-Second connecting section. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0021] The battery housing and battery assembly provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0022] like Figures 1 to 4 As shown in the figure, this application provides a battery frame for fixing the battery cell and preventing it from shaking, thereby ensuring the safety and reliability of the battery assembly. At the same time, the battery frame can provide good heat dissipation performance for the battery cell.

[0023] The battery housing includes a connected housing body 100 and a buffer structure 200. The housing body 100 has a receiving space 110 for accommodating the battery cell. Optionally, the shape and size of the receiving space 110 can be adapted to the shape and size of the battery cell so that the outer peripheral surface of the battery cell fits against the inner surface of the receiving space 110, thereby improving the stability of the fit between the battery cell and the battery housing. The buffer structure 200 is disposed on the outer peripheral surface of the housing body 100. Optionally, the buffer structure 200 can be a ring structure, in which case the buffer structure 200 is disposed around the housing body 100; or, the buffer structure 200 can be an open ring structure, in which case the buffer structure 200 is disposed around a portion of the housing body 100. Optionally, the buffer structure 200 can extend in a direction away from the receiving space 110. In the event of a drop, the buffer structure 200 can deform. When an electronic device is dropped, the frame body 100 has a certain structural strength, which can provide good support for the battery cell. The buffer structure 200 has a certain degree of deformation, which can absorb the impact energy, thereby reducing the impact force on the frame body 100 and protecting the battery cell.

[0024] Optionally, the material of the buffer structure 200 may be different from that of the frame body 100. For example, the frame body 100 may be made of PC (Polycarbonate), which has high strength, toughness and impact resistance, as well as good mechanical properties and heat resistance. Of course, the frame body 100 may also be made of other materials, and this application embodiment does not impose specific limitations on this.

[0025] Optionally, a two-color molding process or an overmolding process can be used in the manufacturing of the battery frame; this application embodiment does not impose specific limitations on either. Further, optionally, when using the two-color molding process to manufacture the battery frame, the frame body 100 is first injection molded using a two-color injection molding machine, and then the buffer structure 200 is injection molded in the same mold. This process offers fast molding speed, high appearance quality, and is suitable for producing precision products. Alternatively, optionally, when using the overmolding process to manufacture the battery frame, the frame body 100 is first injection molded, and then the injection-molded frame body 100 is placed in another mold for secondary injection molding, thereby forming the buffer structure 200 on the frame body 100. This process does not require a two-color injection molding machine, resulting in lower equipment investment.

[0026] Compared to existing technologies, the battery housing in this embodiment improves its impact resistance by providing a buffer structure 200 on the outer peripheral surface of the housing body 100. When an electronic device is dropped, the battery component inside the device is impacted. The buffer structure 200 of the battery housing deforms to absorb the impact force on the battery component, thereby protecting the housing body 100 and the battery cells housed within the housing space of the housing body 100. Therefore, this application solves the problem of poor impact resistance in current battery housings.

[0027] In an optional embodiment, the buffer structure 200 is an elastic deformation structure, which has recoverability and reversibility. In this case, the buffer structure 200 will deform after being subjected to external force, and when the external force is removed, the buffer structure 200 can recover its deformation, which helps to extend the service life of the buffer structure 200. Optionally, the buffer structure 200 can be a rubber structure, a spring structure, etc.

[0028] Optionally, the elastic modulus of the buffer structure 200 is less than that of the frame body 100. That is, under the same force, the deformation of the buffer structure 200 is greater than that of the frame body 100. Correspondingly, the buffer structure 200 has a greater capacity to absorb impact energy than the frame body 100. Therefore, when the battery frame is subjected to impact, the buffer structure 200 can absorb most of the impact energy, reducing the impact energy transmitted to the frame body 100 and thus better protecting the battery cell. Optionally, the frame body 100 and the battery cell can be interference-fitted. During the assembly of the battery cell, the frame body 100 can undergo a small amount of deformation to facilitate cell assembly.

[0029] Optionally, the material of the buffer structure 200 can be thermoplastic polyurethane elastomer, also known as thermoplastic polyurethane rubber, or TPU for short. It has excellent elasticity, wear resistance and impact resistance, and can effectively absorb the impact energy when falling, so as to better protect the battery cell.

[0030] In one optional embodiment, the buffer structure 200 is provided with a deformation space 230. The buffer structure 200 includes an inner elastic wall 240, an outer elastic wall 250, a first connecting portion 260, and a second connecting portion 270. The inner elastic wall 240 and the outer elastic wall 250 are arranged opposite each other in a direction away from the receiving space 110, that is, the outer elastic wall 250 and the inner elastic wall 240 are arranged opposite each other in the radial direction of the frame body 100. The first end of the inner elastic wall 240 is connected to the first end of the outer elastic wall 250 through the first connecting portion 260, and the second end of the inner elastic wall 240 is connected to the second end of the outer elastic wall 250 through the second connecting portion 270. That is, the buffer structure 200 is an annular structure to form the deformation space 230. When the buffer structure 200 is impacted, the outer elastic wall 250 deforms to move closer to the inner elastic wall 240. Simultaneously, the deformation space provides room for the outer elastic wall 250 to deform, allowing it to absorb more impact energy and preventing it from compressing the inner elastic wall 240, thus protecting the frame body 100. Therefore, by providing a deformation space in the buffer structure 200, its buffering performance is improved. Of course, the deformation space in the buffer structure 200 can also be omitted.

[0031] In a further optional embodiment, the buffer structure 200 further includes at least two reinforcing ribs 280, each reinforcing rib 280 being connected between the inner elastic wall 240 and the outer elastic wall 250. The reinforcing ribs 280 are arranged at intervals along the circumference of the frame body 100. The arrangement of the reinforcing ribs 280 not only increases the connection area between the inner elastic wall 240 and the outer elastic wall 250, thereby improving the structural strength of the buffer structure 200, but also enhances the performance of the buffer structure 200 in absorbing impact energy. Of course, the aforementioned reinforcing ribs 280 may also be omitted.

[0032] Optionally, each reinforcing rib 280 can be a straight structure (i.e., a linear structure); or, in other optional embodiments, each reinforcing rib 280 includes a connected first connecting segment 281 and a second connecting segment 282. The first connecting segment 281 is connected to the inner elastic wall 240, and the second connecting segment 282 is connected to the outer elastic wall 250. In the circumferential direction of the frame body 100, the first connecting segment 281 and the second connecting segment 282 are staggered, that is, the reinforcing rib 280 has a bent structure. When the buffer structure 200 is impacted, the outer elastic wall 250 deforms to move closer to the inner elastic wall 240. At the same time, each reinforcing rib 280 also tends to deform after being compressed. At this time, because the first connecting segment 281 and the second connecting segment 282 of the reinforcing rib 280 are staggered, the reinforcing rib 280 has a bent structure. The bent structure has better compressive and bending resistance, which is beneficial to improving the structural strength of each reinforcing rib 280, thereby improving the impact resistance of the buffer structure 200.

[0033] In another optional embodiment, a buffer structure 200 is provided at the corner of the frame body 100. The frame body 100 has a first edge 120 and a second edge 130 connected in its circumferential direction. The first edge 120 is bent relative to the second edge 130 to form a corner of the frame body 100. Optionally, the outer elastic wall 250 of the buffer structure 200 may include a first straight segment 251 and a second straight segment 253 connected in its circumferential direction. The first straight segment 251 is opposite to the first edge 120, and the second straight segment 253 is opposite to the second edge 130. In this case, the first straight segment 251 and the second straight segment 253 form a straight corner. Alternatively, in other optional embodiments, the outer elastic wall 250 of the buffer structure 200 may also include an arc segment 252. The first straight segment 251, the arc segment 252 and the second straight segment 253 are connected in sequence to form an arc corner, and the arc segment 252 is opposite to the corner. Because the curvature of the arc segment 252 is small and the stress is more dispersed, it helps to improve the impact resistance of the outer elastic wall 250, thereby improving the structural stability of the buffer structure 200.

[0034] Optionally, the inner elastic wall 240 of the buffer structure 200 can be L-shaped, and an arc-shaped surface can be provided at the corner of the side of the inner elastic wall 240 facing the outer elastic wall 250 to disperse the stress at the corner.

[0035] Optionally, the first connecting portion 260 may be vertically disposed relative to the inner elastic wall 240; or, in other optional embodiments, the first connecting portion 260 may be inclined relative to the inner elastic wall 240, and the angle formed between the first connecting portion 260 and the inner elastic wall 240 is an acute angle. In this case, the connection area between the first connecting portion 260 and the inner elastic wall 240 is larger, giving the first connecting portion 260 better support stability. When the outer elastic wall 250 is impacted, the inclined first connecting portion 260 can reduce the deformation of the outer elastic wall 250, thereby improving the structural stability of the buffer structure 200. Furthermore, when the first connecting portion 260 is inclined relative to the inner elastic wall 240, it can disperse the stress at the connection between the first connecting portion 260 and the outer elastic wall 250, thereby improving the impact resistance of the buffer structure 200.

[0036] Optionally, the second connecting portion 270 may be vertically disposed relative to the inner elastic wall 240; or, the second connecting portion 270 may be inclined relative to the inner elastic wall 240, with the included angle between the second connecting portion 270 and the inner elastic wall 240 being an acute angle. In this case, the connection area between the second connecting portion 270 and the inner elastic wall 240 is larger, giving the second connecting portion 270 better support stability. When the outer elastic wall 250 is impacted, the inclined second connecting portion 270 can reduce the deformation of the outer elastic wall 250, thereby improving the structural stability of the buffer structure 200. Furthermore, when the second connecting portion 270 is inclined relative to the inner elastic wall 240, it can disperse the stress at the connection between the second connecting portion 270 and the outer elastic wall 250, thereby improving the impact resistance of the buffer structure 200.

[0037] Optionally, at least one of the first connecting portion 260 and the second connecting portion 270 can be a straight structure or an arc structure, and the embodiments of this application do not impose specific limitations on this.

[0038] In an optional embodiment, the number of buffer structures 200 can be one; or, the number of buffer structures 200 can be at least two, with each buffer structure 200 spaced apart along the circumference of the frame body 100, and a buffer structure 200 provided at the corner of the frame body 100; the frame body 100 has a first edge 120 and a second edge 130 connected in its circumference, the first edge 120 being bent relative to the second edge 130 to form a corner of the frame body 100, and the buffer structure 200 provided at the corner includes a first extension segment 210 and a second extension segment 220 connected, the first extension segment 210 being bent relative to the second extension segment 220, that is, the buffer structure 200 is L-shaped, the first extension segment 210 is provided at the first edge 120, and the second extension segment 220 is provided at the second edge 130. Typically, a battery cell has a rectangular structure. When the housing 100 surrounds the battery cell, the shape of the housing 100 matches the shape of the battery cell. In this case, the housing 100 is also rectangular. Since the stress is concentrated at the corners of a rectangular structure, the corners of the housing 100 are prone to breakage after an electronic device is dropped. Therefore, a buffer structure 200 is provided at the corners of the housing 100 to absorb impact energy and better protect the battery cell. Alternatively, a buffer structure 200 can also be provided along the straight edges of the housing 100.

[0039] Optionally, a buffer structure 200 may be provided at each corner of the frame body 100, or a buffer structure 200 may be provided only at some corners of the frame body 100. This application embodiment does not impose specific limitations on this.

[0040] In a further optional embodiment, the outer peripheral surface of the frame body 100 can be a plane; or, the outer peripheral surface of the frame body 100 is provided with a first receiving groove 140 and a second receiving groove 150 that are connected. The first receiving groove 140 and the second receiving groove 150 both extend to two opposite sides of the frame body 100 in its thickness direction (i.e., in the thickness direction of the battery cell). The first receiving groove 140 is located at the first edge 120, and the second receiving groove 150 is located at the second edge 130. A portion of the first extension section 210 is disposed in the first receiving groove 140, and a portion of the second extension section 220 is disposed in the second receiving groove 150. This can not only increase the connection area between the buffer structure 200 and the frame body 100, thereby improving the connection stability and firmness between the two, but also reduce the size of the entire battery frame.

[0041] Optionally, the buffer structure 200 and the frame body 100 can be bonded together by plasma treatment (plasma treatment is a surface modification technology that can improve the surface activity of TPU material, thereby enhancing its adhesion and bonding force with other materials) to increase the adhesion between the two, thereby improving the connection stability and firmness between the buffer structure 200 and the frame body 100; further optionally, the buffer structure 200 and the frame body 100 can be bonded together by adhesives (such as glue) to further increase the adhesion between the two.

[0042] Optionally, the thickness of the buffer structure 200 (i.e., the dimension of the buffer structure 200 in the thickness direction of the cell) can be 0.8~2mm. Of course, it can also be selected according to actual needs. This application embodiment does not impose specific limitations on this.

[0043] Based on the battery frame provided in this application embodiment, in the drop test of the battery module, compared with the battery frame in the prior art, the drop impact energy absorption rate of the battery frame provided in this application embodiment is increased by 30-50%, and the peak pressure in the stress concentration area at the corner is reduced by about 40%. It can be seen that the protective performance of the battery frame provided in this application embodiment has been greatly improved, which can greatly improve the safety and reliability of the battery cell.

[0044] like Figures 5 to 6 As shown, based on the battery frame provided in the embodiments of this application, the embodiments of this application also provide a battery assembly, which includes a battery cell and the battery frame described in any of the above embodiments, with the battery frame surrounding the battery cell.

[0045] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A battery gasket, characterized by, The device includes a connected frame body (100) and a buffer structure (200). The frame body (100) has a receiving space (110) for accommodating the battery cell, and the buffer structure (200) is disposed on the outer peripheral surface of the frame body (100). The buffer structure (200) may deform in the event of an electronic device being dropped.

2. The battery gasket frame of claim 1, wherein, The buffer structure (200) is an elastic deformation structure, and the elastic modulus of the buffer structure (200) is less than the elastic modulus of the frame body (100).

3. The battery gasket frame of claim 2, wherein, The buffer structure (200) is provided with a deformation space (230). The buffer structure (200) includes an inner elastic wall (240), an outer elastic wall (250), a first connecting part (260), and a second connecting part (270). The inner elastic wall (240) and the outer elastic wall (250) are arranged opposite to each other in a direction away from the receiving space (110). The first end of the inner elastic wall (240) is connected to the first end of the outer elastic wall (250) through the first connecting part (260), and the second end of the inner elastic wall (240) is connected to the second end of the outer elastic wall (250) through the second connecting part (270) to form the deformation space (230).

4. The battery gasket frame of claim 3, wherein, The buffer structure (200) further includes at least two reinforcing ribs (280), each of the reinforcing ribs (280) being connected between the inner elastic wall (240) and the outer elastic wall (250), and each of the reinforcing ribs (280) being arranged at intervals along the circumference of the frame body (100).

5. The battery gasket frame of claim 4, wherein, Each of the reinforcing ribs (280) includes a first connecting segment (281) and a second connecting segment (282) connected together. The first connecting segment (281) is connected to the inner elastic wall (240), and the second connecting segment (282) is connected to the outer elastic wall (250). In the circumferential direction of the frame body (100), the first connecting segment (281) and the second connecting segment (282) are staggered.

6. The battery gasket frame of claim 3, wherein, The buffer structure (200) is provided at the corner of the frame body (100). The frame body (100) has a first edge (120) and a second edge (130) connected in its circumferential direction. The first edge (120) is bent relative to the second edge (130) to form the corner. The outer elastic wall (250) of the buffer structure (200) includes a first straight segment (251), an arc segment (252) and a second straight segment (253) connected in sequence. The first straight segment (251) is opposite to the first edge (120), the second straight segment (253) is opposite to the second edge (130), and the arc segment (252) is opposite to the corner.

7. The battery gasket frame of claim 3, wherein, The first connecting portion (260) is inclined relative to the inner elastic wall (240), and the included angle formed between the first connecting portion (260) and the inner elastic wall (240) is an acute angle; and / or, The second connecting part (270) is inclined relative to the inner elastic wall (240), and the included angle formed between the second connecting part (270) and the inner elastic wall (240) is an acute angle.

8. The battery gasket frame of claim 1, wherein, The number of buffer structures (200) is at least two, and each buffer structure (200) is arranged at intervals along the circumference of the frame body (100). The buffer structure (200) is provided at the corner of the frame body (100). The frame body (100) has a first edge (120) and a second edge (130) connected in its circumferential direction. The first edge (120) is bent relative to the second edge (130) to form the corner. The buffer structure (200) disposed at the corner includes a first extension segment (210) and a second extension segment (220) connected. The first extension segment (210) is bent relative to the second extension segment (220). The first extension segment (210) is disposed at the first edge (120), and the second extension segment (220) is disposed at the second edge (130).

9. The battery gasket frame of claim 8, wherein, The outer peripheral surface of the frame body (100) is provided with a first receiving groove (140) and a second receiving groove (150) that are connected. The first receiving groove (140) and the second receiving groove (150) both extend to two opposite sides of the frame body (100) in its thickness direction. The first receiving groove (140) is located at the first edge (120), and the second receiving groove (150) is located at the second edge (130). A portion of the first extension section (210) is disposed in the first receiving groove (140), and a portion of the second extension section (220) is disposed in the second receiving groove (150).

10. A battery assembly characterized by, It includes a battery cell and a battery housing according to any one of claims 1 to 9, the battery housing being disposed around the battery cell.

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