Battery cover plate and battery

Abstract

The invention relates to the technical field of new energy batteries, and discloses a battery cover plate and a battery, and the battery cover plate is characterized in that a first through hole is formed in a cover plate main body; the insulating part comprises a first plastic part and a second plastic part, a second through hole is formed in the first plastic part, and the second through hole is communicated with the first through hole; a third through hole is formed in the second plastic part and is communicated with the first through hole; the hot melting structure is arranged on one of the cover plate main body and the insulating part, and the volume of the hot melting structure is V1; the hot melting hole is formed in the other one of the cover plate main body and the insulating part, the hot melting structure is embedded into the hot melting hole, the volume of the hot melting hole is V2, and V1 / V2 is larger than or equal to 0.7 and smaller than or equal to 1. By arranging the hot melting structure and the hot melting hole, the insulating part and the cover plate main body are in hot melting connection, firm and seamless connection is formed, and the anti-vibration capacity of the insulating part and the cover plate main body is high; while the strength of hot melting connection is ensured, a gap is prevented from being formed between the insulating part and the cover plate main body after hot melting connection.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy batteries, and in particular to a battery cover and a battery. Background Art

[0002] With the continuous development of science and technology, the technology of new energy batteries is also constantly innovating and improving. The battery cover is a key structure in new energy batteries that protects the internal structure of the battery from external influences. The battery cover directly affects the safety and reliability of the battery.

[0003] New energy batteries are often used in high-vibration environments. Under the influence of vibration, the insulating parts in the battery cover are easily separated from the cover body, affecting the safety performance of the battery. Summary of the invention

[0004] In view of this, the present invention provides a battery cover and a battery to solve the problem that the insulating member in the battery cover is easily separated from the cover body, thereby affecting the safety performance of the battery.

[0005] In the first aspect, the present invention provides a battery cover, comprising: a cover body, provided with a first through hole; an insulating member, comprising a first plastic member and a second plastic member, the first plastic member being arranged on one side of the cover body, the first plastic member being provided with a second through hole, the second through hole being connected to the first through hole; the second plastic member being arranged on the other side of the cover body, the second plastic member being provided with a third through hole, the third through hole being connected to the first through hole; a hot melt structure being arranged on one of the cover body and the insulating member, the volume of the hot melt structure being V1; a hot melt hole being arranged on the other of the cover body and the insulating member, the hot melt structure being embedded in the hot melt hole, the volume of the hot melt hole being V2, satisfying 0.7≤V1 / V2≤1.

[0006] Beneficial effect: By setting the hot melt structure and the hot melt hole, the insulating part and the cover body are hot-melt connected to form a firm and seamless connection, and the insulating part and the cover body have strong vibration resistance; while ensuring the strength of the hot melt connection, it prevents the existence of a gap between the insulating part and the cover body after the hot melt connection.

[0007] In an optional embodiment, the hot melt structure is arranged on the cover plate body, and the hot melt hole is opened on the first plastic part and / or the second plastic part.

[0008] In an optional embodiment, the hot melt hole is opened on the cover plate body, and the hot melt structure is arranged on the first plastic part and / or the second plastic part.

[0009] Beneficial effect: The hot melt structure and the multi-position setting of the hot melt holes further improve the connection strength between the insulating member and the cover body, and prevent the insulating member from being separated from the cover body.

[0010] In an optional implementation, along the xy plane, the maximum width of the hot melt structure is W, satisfying W≤1 mm.

[0011] Beneficial effect: By limiting the maximum width of the hot-melt structure, the phenomenon of poor hot-melt effect or even failure of hot-melt due to the hot-melt structure being too wide can be prevented.

[0012] In an optional embodiment, along the xy plane, the cross-section of the hot-melt structure is circular or polygonal.

[0013] In an optional embodiment, the hot melt hole is a vertical hole, an inclined hole or a stepped hole.

[0014] Beneficial effects: The hot melt holes are vertical holes, which are easy to process and shape; the hot melt holes are inclined holes or stepped holes, which improve the connection strength of ultrasonic hot melt.

[0015] In an optional embodiment, a plurality of the hot melt holes and a plurality of the hot melt structures are provided, and the plurality of the hot melt holes and the plurality of the hot melt structures are provided in a one-to-one correspondence.

[0016] Beneficial effect: By providing a plurality of hot melt holes and hot melt structures, the connection strength between the insulating member and the cover plate body is further improved, and the insulating member is prevented from being separated from the cover plate body.

[0017] In an optional implementation, along the z direction, a distance between a surface of the first plastic part away from the second plastic part and a surface of the cover plate body away from the second plastic part is A, satisfying 0<A≤0.5 mm.

[0018] Beneficial effect: By limiting the distance between the upper surface of the first plastic part and the upper surface of the cover plate body, the structural strength of the cover plate is ensured while improving the utilization rate of the internal space of the battery cell.

[0019] In an optional embodiment, the hot melt structure and the insulating component are integrally formed.

[0020] Beneficial effects: The hot melt structure and the insulating part are integrally formed, which saves process costs. The connection strength between the hot melt structure and the insulating part is high. After the hot melt structure is embedded in the hot melt hole and ultrasonically melted, the connection strength between the insulating part and the cover plate body is higher.

[0021] In a second aspect, the present invention further provides a battery, comprising the above-mentioned battery cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of the structure explosion of the battery cover plate of an embodiment of the present invention (front view);

[0024] Figure 2 It is a schematic diagram of the structure explosion of the battery cover plate of an embodiment of the present invention (reverse);

[0025] Figure 3 A schematic diagram of the top structure of a battery cover plate according to an embodiment of the present invention;

[0026] Figure 4 for Figure 3 BB section view in;

[0027] Figure 5 It is a schematic structural diagram of a vertical hot melt hole according to an embodiment of the present invention;

[0028] Figure 6 It is a schematic structural diagram of an inclined hot melt hole according to an embodiment of the present invention;

[0029] Figure 7 It is a schematic structural diagram of a stepped hot melt hole according to an embodiment of the present invention.

[0030] Description of reference numerals:

[0031] 10. Cover plate body; 11. First perforation; 20. Insulating member; 21. First plastic member; 211. Second perforation; 22. Second plastic member; 221. Third perforation; 30. Hot melt structure; 40. Hot melt hole; 50. Liquid injection port. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0033] Combine the following Figures 1 to 7 , describing an embodiment of the present invention.

[0034] According to an embodiment of the present invention, in the first aspect, a battery cover is provided, including a cover body 10, an insulating member 20, a hot melt structure 30 and a hot melt hole 40. The cover body 10 is provided with a first through hole 11; the insulating member 20 includes a first plastic member 21 and a second plastic member 22, the first plastic member 21 is arranged on one side of the cover body 10, the first plastic member 21 is provided with a second through hole 211, and the second through hole 211 is connected to the first through hole 11; the second plastic member 22 is arranged on the other side of the cover body 10, the second plastic member 22 is provided with a third through hole 221, and the third through hole 221 is connected to the first through hole 11; the hot melt structure 30 is arranged on one of the cover body 10 and the insulating member 20, and the volume of the hot melt structure 30 is V1; the hot melt hole 40 is arranged on the other of the cover body 10 and the insulating member 20, the hot melt structure 30 is embedded in the hot melt hole 40, and the volume of the hot melt hole 40 is V2, satisfying 0.7≤V1 / V2≤1.

[0035] The battery cover of this embodiment is applied, by providing a hot melt structure 30 and a hot melt hole 40, so that the insulating member 20 and the cover body 10 are hot-melt connected to form a firm, seamless connection, and the insulating member 20 and the cover body 10 have strong vibration resistance; while ensuring the strength of the hot melt connection, a gap is prevented from existing between the insulating member 20 and the cover body 10 after the hot melt connection.

[0036] It should be noted that when V1 / V2 is less than 0.7, due to the limited amount of melt provided by the hot melt structure 30, the hot melt hole 40 cannot be fully filled, resulting in a poor hot melt effect and a low hot melt strength; when V1 / V2 is greater than 1, the pressure applied to the hot melt hole 40 by the hot melt structure 30 during the hot melt process is more concentrated. This concentrated pressure causes excessive deformation or stress in the material around the hot melt hole 40, thereby affecting the flatness and precision of the mating surface.

[0037] It should be noted that, in the present embodiment, after the hot melt structure 30 and the insulating member 20 are injection molded, the hot melt structure 30 is embedded in the hot melt hole 40 for ultrasonic hot melting.

[0038] Specifically, in this embodiment, the first through hole 11, the second through hole 211 and the third through hole 221 are connected, and the pole ear in the pole group can pass through the first through hole 11, the second through hole 211 and the third through hole 221 and be folded over the battery cover.

[0039] It should be noted that in the related art, the tab needs to be connected to the battery cover through a connecting piece to transmit electrical energy to the outside. However, the connecting piece is arranged in the battery shell, occupying the internal space of the battery shell.

[0040] It is worth noting that, in the present embodiment, the pole ear passes through the first perforation 11, the second perforation 211 and the third perforation 221 and is folded over the top of the battery cover, so that electric energy is directly transmitted to the outside through the pole ear, eliminating the use of connecting plates, thereby reducing the internal space occupied by the battery shell, and the size of the pole group can be increased to increase the space utilization inside the battery, thereby improving the battery energy density.

[0041] Please note that Figure 1 The first plastic part 21 is arranged on one side of the cover body 10, that is, along the z direction, the first plastic part 21 is arranged on the upper side of the cover body 10; the second plastic part 22 is arranged on the other side of the cover body 10, that is, along the z direction, the second plastic part 22 is arranged on the lower side of the cover body 10.

[0042] In one embodiment, Figure 1 and Figure 2 As shown, the hot melt structure 30 is arranged on the first plastic part 21 and the second plastic part 22, and the hot melt hole 40 is opened on the cover body 10. The multiple positions of the hot melt structure 30 and the hot melt hole 40 further improve the connection strength between the insulating part 20 and the cover body 10, and prevent the insulating part 20 from being separated from the cover body 10.

[0043] For details, please refer to Figure 1 and Figure 2 There are a plurality of hot melt structures 30 and hot melt holes 40, a plurality of hot melt structures 30 are arranged on the first plastic part 21 at intervals, a plurality of hot melt structures 30 are arranged on the second plastic part 22 at intervals, a plurality of hot melt holes 40 are arranged on the upper and lower sides of the cover body 10 at intervals, the plurality of hot melt structures 30 on the first plastic part 21 correspond one-to-one to the plurality of hot melt holes 40 opened on the upper surface of the cover body 10, and the plurality of hot melt structures 30 on the second plastic part 22 correspond one-to-one to the plurality of hot melt holes 40 opened on the lower surface of the cover body 10.

[0044] In other alternative embodiments, the hot melt structure 30 may also be only disposed on the upper surface of the cover body 10 , and the hot melt hole 40 may be only opened on the first plastic part 21 ;

[0045] Alternatively, the hot melt structure 30 may also be only disposed on the lower surface of the cover body 10 , and the hot melt hole 40 may be only opened on the second plastic part 22 ;

[0046] Alternatively, the plurality of hot melt structures 30 may be respectively disposed on the upper and lower surfaces of the cover body 10, and the plurality of hot melt holes 40 may be respectively opened on the first plastic part 21 and the second plastic part 22, wherein the plurality of hot melt holes 40 on the first plastic part 21 correspond one-to-one to the plurality of hot melt structures 30 on the upper surface of the cover body 10, and the plurality of hot melt holes 40 on the second plastic part 22 correspond one-to-one to the plurality of hot melt structures 30 on the lower surface of the cover body 10;

[0047] Alternatively, the hot melt hole 40 may also be only provided on the upper surface of the cover body 10 , and the hot melt structure 30 may be only provided on the first plastic part 21 ;

[0048] Alternatively, the hot melt hole 40 may also be only provided on the lower surface of the cover body 10 , and the hot melt structure 30 may be only provided on the second plastic part 22 ;

[0049] Alternatively, multiple hot melt structures 30 can also be respectively arranged on the upper and lower sides of the cover body 10, the first plastic part 21 and the second plastic part 22, and multiple hot melt holes 40 are respectively opened on the upper and lower sides of the cover body 10, the first plastic part 21 and the second plastic part 22. The multiple hot melt structures 30 on the first plastic part 21 correspond one-to-one to the multiple hot melt holes 40 opened on the upper surface of the cover body 10, and the multiple hot melt structures 30 on the second plastic part 22 correspond one-to-one to the multiple hot melt holes 40 opened on the lower surface of the cover body 10. The multiple hot melt holes 40 on the first plastic part 21 correspond one-to-one to the multiple hot melt structures 30 on the upper surface of the cover body 10, and the multiple hot melt holes 40 on the second plastic part 22 correspond one-to-one to the multiple hot melt structures 30 on the lower surface of the cover body 10.

[0050] It should be noted that the locations of the hot melt structure 30 and the hot melt hole 40 can be adjusted according to actual conditions.

[0051] In one embodiment, Figure 2 As shown, along the xy plane, the maximum width of the hot melt structure 30 is W, which satisfies W≤1 mm. By limiting the maximum width of the hot melt structure 30, the phenomenon of poor hot melt effect or even failure of hot melt due to the hot melt structure 30 being too wide can be prevented.

[0052] It should be noted that when W>1mm, the hot melt structure 30 will be too wide, which may cause part of the structure to fail to be hot-melted in place, resulting in poor hot melt effect. The poor hot melt effect will lead to poor connection and bonding effect between the hot melt structure 30 and the hot melt hole 40, and ultimately cause failure of the connection between the insulating part 20 and the cover plate body 10.

[0053] In one embodiment, along the xy plane, the cross-section of the hot melt structure 30 is circular.

[0054] It should be noted that circular holes are easier to position because the circle has isotropic properties, making the assembly process smoother. The shape of the circular hole helps to evenly distribute heat inside the material, reduce heat loss, and improve hot melt efficiency.

[0055] In other alternative embodiments, the cross section of the hot melt structure 30 may also be a polygon. Compared with a circular hole, a polygonal hole has higher variability and adjustability, so as to adapt to different manufacturing and assembly requirements.

[0056] In one embodiment, Figure 5 As shown, the hot melt hole 40 is a vertical hole. The hot melt hole 40 is a vertical hole, which is convenient for processing and forming.

[0057] Specifically, the vertical hole has a simple structure, is easy to process, and is convenient for the molding design of the corresponding hot melt structure 30 .

[0058] In another embodiment, Figure 6 As shown, the hot melt hole 40 can also be an inclined hole. The hot melt hole 40 uses an inclined hole to improve the connection strength of ultrasonic hot melt.

[0059] It should be noted that the reason why the hot melt effect can be improved when the hot melt hole 40 is an inclined hole is mainly because the design of the inclined hole helps to transfer heat more concentratedly and evenly inside the material, promote the flow and mixing of the molten material, and reduce the generation of bubbles and defects.

[0060] In another embodiment, Figure 7 As shown, the hot melt hole 40 can also be a stepped hole. The hot melt hole 40 is a stepped hole to improve the connection strength of ultrasonic hot melt.

[0061] It should be noted that the reason why the hot melt effect can be improved when the hot melt hole 40 is designed as a stepped hole is mainly because the design of the stepped hole helps to optimize heat distribution, improve the material melting and fusion process, and improve process adaptability and flexibility.

[0062] It should be noted that a groove body can be opened on the basis of the stepped hole to further improve the hot melting effect.

[0063] In one embodiment, Figure 1 and Figure 2 As shown, there are a plurality of hot melt holes 40 and a plurality of hot melt structures 30, and the plurality of hot melt holes 40 and the plurality of hot melt structures 30 are arranged one by one. By providing a plurality of hot melt holes 40 and hot melt structures 30, the connection strength between the insulating member 20 and the cover body 10 is further improved to prevent the insulating member 20 from being separated from the cover body 10.

[0064] It should be noted that the number of the hot melt holes 40 and the hot melt structures 30 can be selected according to actual conditions.

[0065] In one embodiment, Figure 4 As shown, along the z direction, the distance between the side of the first plastic part 21 away from the second plastic part 22 and the side of the cover body 10 away from the second plastic part 22 is A, which satisfies 0<A≤0.5mm. By limiting the distance between the upper surface of the first plastic part 21 and the upper surface of the cover body 10, the structural strength of the cover is ensured while improving the utilization rate of the internal space of the battery cell.

[0066] It should be noted that when A>0.5mm, the overall strength of the battery cover will be reduced and will not meet the use requirements; when the upper surface of the first plastic part 21 is higher than the upper surface of the cover body 10, the overall height of the battery cover is relatively high, affecting the space utilization of the battery.

[0067] In one embodiment, the hot melt structure 30 is integrally formed with the insulating member 20. The hot melt structure 30 is integrally formed with the insulating member 20, which saves process costs, and the connection strength between the hot melt structure 30 and the insulating member 20 is high. After the hot melt structure 30 is embedded in the hot melt hole 40 and ultrasonically melted, the connection strength between the insulating member 20 and the cover plate body 10 is higher.

[0068] Specifically, after the hot melt structure 30 and the insulating member 20 are integrally injection-molded, the hot melt structure 30 and the hot melt hole 40 are ultrasonically hot-melted to connect the insulating member 20 and the cover plate body 10 .

[0069] In one embodiment, Figures 1 to 3 As shown, a liquid injection port 50 is provided on the cover body 10, and the liquid injection port 50 is set through the cover body 10. By providing the liquid injection hole, the electrolyte can be directly added to the battery through the liquid injection hole without opening the battery cover when adding electrolyte, so as to ensure the normal operation of the battery.

[0070] Next, an anti-detachment test is performed on battery covers with different V1 / V2 ratios. The anti-detachment test includes a vibration test and a pulling test. The specific test results are shown in Table 1 below.

[0071] Table 1 Anti-detachment test results

[0072]

[0073] It should be noted that when the battery cover is subjected to a vibration test, the battery cover is placed in a vibration tester, and the connection between the insulating member 20 and the cover body 10 is checked after the test.

[0074] It should be noted that when the battery cover is subjected to a pulling test, one of the insulating member 20 and the cover body 10 is fixed, and a pulling force is applied to the other of the insulating member 20 and the cover body 10. After the test, the connection between the insulating member 20 and the cover body 10 is checked.

[0075] Specifically, the pulling force of the pulling test is 25N.

[0076] It can be seen from the test results in Table 1 that in Examples 1 to 11, 0.7≤V1 / V2≤1. In this case, after the insulating member 20 and the cover plate body 10 were ultrasonically hot-melted, a vibration test and a pulling test were performed respectively. No fracture was found between the insulating member 20 and the cover plate body 10, and the insulating member 20 did not separate from the cover plate body 10.

[0077] It can be seen from the test results in Table 1 that in Comparative Example 1, V1 / V2 is less than 0.7. In this case, after the insulating member 20 and the cover plate body 10 are ultrasonically hot-melted, a vibration test and a pulling test are respectively carried out. A fracture is found between the insulating member 20 and the cover plate body 10, and the insulating member 20 and the cover plate body 10 are separated.

[0078] It should be noted that, from the test results in Table 1, it can be seen that after ultrasonic heat-melting the insulating member 20 and the cover body 10 in the case of V1 / V2>1, although no fracture was found between the insulating member 20 and the cover body 10, and the insulating member 20 and the cover body 10 did not separate, it was found that there was a gap between the insulating member 20 and the cover body 10, which additionally occupied the internal space of the battery shell, affecting the internal space utilization of the battery, and the electrolyte was easily accumulated in this gap, affecting the battery cycle life. Therefore, the case of V1 / V2>1 is not recommended.

[0079] In summary, by limiting 0.7≤V1 / V2≤1, the strength of the hot melt connection is ensured while preventing a gap from existing between the insulating member 20 and the cover plate body 10 after the hot melt connection, thereby ensuring the stability of the battery.

[0080] According to an embodiment of the present invention, in a second aspect, a battery is further provided, comprising the above-mentioned battery cover.

[0081] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the present invention.

Claims

1. A battery cover, characterized in that: include: The cover plate body is provided with a first through hole; The insulating member includes a first plastic member and a second plastic member, wherein the first plastic member is disposed on one side of the cover body, a second through hole is formed on the first plastic member, and the second through hole is connected to the first through hole; the second plastic member is disposed on the other side of the cover body, a third through hole is formed on the second plastic member, and the third through hole is connected to the first through hole; A hot melt structure is provided on one of the cover plate body and the insulating member, and the volume of the hot melt structure is V1; A hot melt hole is provided on the other of the cover plate body and the insulating member, the hot melt structure is embedded in the hot melt hole, and the volume of the hot melt hole is V2, satisfying 0.7≤V1 / V2≤1.

2. The battery cover according to claim 1, characterized in that: The hot melt structure is arranged on the cover plate body, and the hot melt hole is opened on the first plastic part and / or the second plastic part.

3. The battery cover according to claim 1, characterized in that: The hot melt hole is opened on the cover plate body, and the hot melt structure is arranged on the first plastic part and / or the second plastic part.

4. The battery cover according to any one of claims 1 to 3, characterized in that: Along the xy plane, the maximum width of the hot melt structure is W, satisfying W≤1 mm.

5. The battery cover according to any one of claims 1 to 3, characterized in that: Along the xy plane, the cross section of the hot melt structure is circular or polygonal.

6. The battery cover according to any one of claims 1 to 3, characterized in that: The hot melt hole is a vertical hole, an inclined hole or a stepped hole.

7. The battery cover according to any one of claims 1 to 3, characterized in that: A plurality of the hot melt holes and the hot melt structures are provided, and the plurality of the hot melt holes and the plurality of the hot melt structures are provided in a one-to-one correspondence.

8. The battery cover according to any one of claims 1 to 3, characterized in that: Along the z direction, a distance between a surface of the first plastic part away from the second plastic part and a surface of the cover plate body away from the second plastic part is A, satisfying 0<A≤0.5 mm.

9. The battery cover according to claim 1 or 3, characterized in that: The hot melt structure and the insulating member are integrally formed.

10. A battery, characterized in that: A battery cover comprising the battery cover according to any one of claims 1 to 9.

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