Battery end plate, injection molding device and battery pack

Abstract

The utility model provides a battery end plate, an injection molding device and a battery pack, the battery end plate comprises an end plate body and a copper bar structure, the copper bar structure is partially embedded in the end plate body, and the copper bar structure comprises a first exposed part, a second exposed part and a copper bar body; the first exposed part comprises a first step and a second step, the first step and the second step are integrally formed, the first step is fixedly connected with the copper bar body, the horizontal plane of the second step is lower than the first step, and the second exposed part is connected with the copper bar body. The injection molding device has the beneficial effects that a corresponding abutting structure is used in the injection molding device and abuts against the step structure on the first exposed part and / or the second exposed part, so that injection molding glue can be prevented from flowing into the surface of the battery end plate through a gap, the bad phenomenon of glue overflow is avoided, the battery end plate can be prevented from being obliquely punched or deformed, and the service life of the battery end plate is prolonged. And the yield of finished products is guaranteed, and the injection molding device can be protected.

Description

Technical Field

[0001] The utility model relates to the field of new energy, and in particular to a battery end plate, an injection molding device and a battery pack. Background Art

[0002] At present, some positive and negative integrated parts or module end plates that are inlaid with hardware injection molding have high filling pressure during the injection molding production process, making it difficult for the filling to flow. This can easily cause the hardware copper busbar to deform, overflow or crack on the surface of the hardware copper busbar, resulting in the entire product being scrapped or having poor insulation and voltage resistance. Utility Model Content

[0003] The main purpose of the utility model is to provide a battery end plate, an injection molding device and a battery pack, aiming to solve the problem of glue overflow or cracking on the surface of the hardware copper busbar.

[0004] The utility model provides a battery end plate, comprising:

[0005] An end plate body and a copper busbar structure, wherein the copper busbar structure is partially embedded in the end plate body and includes a first exposed portion, a second exposed portion, and a copper busbar body;

[0006] The first exposed portion includes a first step and a second step, the first step and the second step are integrally formed, the first step is fixedly connected to the copper busbar body, the horizontal plane of the second step is lower than the first step, and the second exposed portion is connected to the copper busbar body.

[0007] Furthermore, the second exposed portion includes a third step and a fourth step, the third step is fixedly connected to the first end of the copper busbar body, the third step and the fourth step are integrally formed, and the horizontal plane of the fourth step is lower than the third step.

[0008] Furthermore, the copper busbar body is provided with at least one through hole.

[0009] Furthermore, the through hole is a through circular hole, and the diameter of the through circular hole is 1mm-10mm.

[0010] Furthermore, the diameter of the through circular hole is 2mm-4mm.

[0011] The utility model also provides a battery end plate, comprising:

[0012] An end plate body and a copper busbar structure, wherein the copper busbar structure is partially embedded in the end plate body and includes a first exposed portion, a second exposed portion, and a copper busbar body; a first end of the copper busbar body is fixedly connected to a first end of the first exposed portion, and a second end of the copper busbar body is fixedly connected to a first end of the second exposed portion;

[0013] The second exposed portion includes a third step and a fourth step. The third step is fixedly connected to the first end of the copper busbar body. The third step and the fourth step are integrally formed. The horizontal plane of the fourth step is lower than that of the third step.

[0014] The present invention also provides an injection molding device for preparing the battery end plate described above, comprising:

[0015] Injection molding device body, mold front mold slide and rear mold slider;

[0016] The mold front mold slide and the rear mold slider are slidably connected to the injection molding device body, and the mold front mold slide, the rear mold slider and the injection molding device body constitute an injection cavity;

[0017] The front mold slide is used to abut against the second exposed part, and the rear mold slider is used to abut against the first exposed part.

[0018] Furthermore, the battery end plate is the battery end plate described above, the mold front mold slide has a step structure adapted to the fourth step, and the mold front mold slide abuts against the fourth step through the adapted step structure;

[0019] The rear mold slider has a step structure adapted to the second step, and the rear mold slider abuts against the second step through the adapted step structure.

[0020] Furthermore, the mold front mold slide includes a first mold front mold slide and a second mold front mold slide, and the rear mold slider includes a first rear mold slider and a second rear mold slider;

[0021] The front mold slide of the first mold is in contact with the front mold slide of the second mold, the first rear mold slider is in contact with the second rear mold slider, the front mold slide of the second mold is provided with a stepped structure adapted to the fourth step, and the first rear mold slider is provided with a stepped structure adapted to the second step;

[0022] The first mold front mold slide, the second mold front mold slide, the first rear mold slide block and the second rear mold slide block are all slidably connected to the injection molding device body;

[0023] A first cavity consisting of the first mold front mold slide, the first rear mold slider, the second rear mold slider, the injection molding device body, the back surface of the first exposed part, the back surface of the second exposed part, and the copper busbar body;

[0024] The second cavity is formed by the injection molding device body, the first mold front mold slide and the copper busbar body.

[0025] Furthermore, it also includes an ejector pin, which is slidably connected to the injection molding device body, and the end of the ejector pin is arranged in the injection molding cavity for abutting against the copper busbar body.

[0026] The present invention also provides a battery pack, comprising: an electrical connector and at least two battery modules, wherein the battery module comprises a battery cell stack and two battery end plates prepared by the injection molding device described in any one of the above;

[0027] The two ends of the battery cell stack are respectively fixedly connected to the two end plate bodies, the second exposed part of one of the copper busbar structures is electrically connected to the positive electrode ear of the battery cell stack, and the second exposed part of the other copper busbar structure is electrically connected to the negative electrode ear of the battery cell stack, and the two ends of the electrical connector are respectively electrically connected to the first exposed parts of two different adjacent battery end plates to realize the series connection between the two battery modules.

[0028] The beneficial effects of the present invention are as follows: by arranging a stepped shape on the first exposed part and / or the second exposed part to form a "Z"-shaped stop structure, during the injection molding process, a corresponding abutment structure can be used in the injection molding device to abut against the stepped structure on the first exposed part and / or the second exposed part, thereby preventing the injection glue from flowing through the gap into the surface of the battery end plate and avoiding the occurrence of glue overflow. Secondly, arranging the stepped structure can enable the abutment structure to press the battery end plate tightly, and under the pressure during the injection molding process, it can also prevent the battery end plate from being distorted or deformed, thereby ensuring the yield of the finished product and protecting the injection molding device. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic structural diagram of a copper busbar structure according to an embodiment of the present invention;

[0030] Figure 2 This is a structural front view of a copper busbar structure according to an embodiment of the present invention;

[0031] Figure 3 yes Figure 2 Structural cross-section of the copper busbar structure at AA in the middle;

[0032] Figure 4 This is a structural schematic diagram of an injection molding device according to one embodiment of the present invention;

[0033] Figure 5 This is a schematic cross-sectional view of the structure of an injection molding device according to one embodiment of the present invention;

[0034] Figure 6 yes Figure 5 A partial enlarged schematic diagram;

[0035] Figure 7 This is a schematic diagram of an end plate structure according to an embodiment of the present utility model;

[0036] Figure 8 yes Figure 7 A partial enlarged schematic diagram;

[0037] Figure 9 This is a partial structural diagram of a battery pack according to an embodiment of the present invention;

[0038] Figure 10 This is an exploded schematic diagram of an end plate structure according to one embodiment of the present invention;

[0039] Figure 11 It is a partially enlarged schematic diagram of an end plate structure of an embodiment of the present utility model.

[0040] Figure 1-11 Middle: 1. First exposed part; 2. Copper busbar body; 3. Second exposed part; 11. First step; 12. Second step; 13. Bolt sleeve; 21. Through hole; 31. Third step; 32. Fourth step; 41. First mold front mold slide; 42. Second mold front mold slide; 43. First rear mold slider; 44. Second rear mold slider; 45. Injection molding device body; 46. Ejector pin; 47. First cavity; 42. Second cavity; 51. End plate body; 52. Electrical connector.

[0041] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only 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 ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0043] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. The connection can be a direct connection or an indirect connection.

[0044] The term "and / or" in this article is only a description of the association relationship between associated objects, indicating that there can be three relationships. For example, A and B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0045] In addition, in this utility model, the descriptions of "first" and "second" are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features specified as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0046] Reference Figure 1-3 as well as Figure 7-10 The utility model provides a battery end plate, comprising:

[0047] An end plate body 51 and a copper busbar structure, wherein the copper busbar structure is partially embedded in the end plate body 51 and includes a first exposed portion 1, a second exposed portion 3 and a copper busbar body 2;

[0048] The first exposed portion 1 includes a first step 11 and a second step 12. The first step 11 and the second step 12 are integrally formed. The first step 11 is fixedly connected to the copper busbar body 2. The horizontal plane of the second step 12 is lower than the first step 11. The second exposed portion 3 is connected to the copper busbar body 2.

[0049] In this embodiment, the first exposed portion 1 is configured as a first step 11 and a second step 12 structure, forming a stepped "Z"-shaped stop structure. During the injection molding process, a corresponding abutment structure can be used in the injection molding device to abut against the second step 12 structure, thereby preventing the injection glue from flowing through the gap to the surface of the first exposed portion 1 and avoiding the occurrence of glue overflow. Secondly, the step structure can be configured to enable the abutment structure to press the battery end plate, thereby preventing the battery end plate from being distorted or deformed under the pressure of the injection molding process, thereby ensuring the yield of the finished product and protecting the injection molding device. The copper busbar structure can be any copper busbar structure, such as Figure 1 The copper busbar structure in the form of a ladder can also be a flat structure. The specific design can be adapted to the battery structure, and this application does not limit this.

[0050] In a specific embodiment, the first exposed portion 1, the second exposed portion 3, and the copper busbar body 2 are integrally formed. It should be noted that the aforementioned fixed connection methods include integral molding, as well as commonly used connection methods such as welding and bolting. During the processing of the battery end plate, a copper sheet is bent using a bending process to form the structure of the first exposed portion 1, the second exposed portion 3, and the copper busbar body 2.

[0051] In one embodiment, the second exposed portion 3 includes a third step 31 and a fourth step 32, the third step 31 is fixedly connected to the first end of the copper busbar body 2, the third step 31 and the fourth step 32 are integrally formed, and the horizontal plane of the fourth step 32 is lower than the third step 31.

[0052] In this embodiment, during the injection molding process, a corresponding abutment structure can be used in the injection molding device to abut against the fourth step 32 structure and cooperate with the second step 12 structure at the other end to achieve a better pressing effect, further ensuring the yield of the finished product.

[0053] It should be noted that the third step 31 surface and the first step 11 surface are exposed step surfaces and do not require injection molding. The third step 31 surface is connected to the battery cell stack, and the first step 11 surface is connected to the electrical connector 52, which is used to connect each battery cell stack.

[0054] Reference Figure 1-2 as well as Figure 11 In one embodiment, at least one through hole 21 is provided on the copper busbar body 2. Since the plastic and the battery end plate are not welded, the copper busbar surface is smooth and the friction is small. Therefore, it is necessary to design the through hole 21 so that the injection glue can flow into the circular hole to form an "I"-shaped fixed glue column, so as to achieve a clamping state on both sides, which cannot be separated, thereby preventing the plastic from cracking and the battery end plate from shifting. The injection glue can be any glue that can be injected, such as: PS (Polycarbonate), ABS (Acrylonitrile Butadiene Styrene), or a mixture of ABS and PS.

[0055] In one embodiment, the through-holes 21 are through-holes, and the diameter of the through-holes 21 is 1 mm to 10 mm, preferably 2 mm to 4 mm. It should be noted that if the hole diameter is larger, the number of through-holes 21 should be smaller. Conversely, if the hole diameter is smaller, the number of through-holes 21 should be larger. The specific number can be set according to actual conditions. Without affecting the conductive function and the strength of the battery end plate, providing more through-holes 21 can ensure a clamping state on both sides.

[0056] In one embodiment, a bolt sleeve 13 is further provided on one side of the first exposed portion 1 close to the copper busbar body 2. The bolt sleeve 13 is used to connect with the electrical connector 52 to achieve a fixed connection between the electrical connector 52 and the first exposed portion 1.

[0057] The utility model also provides a battery end plate, comprising:

[0058] An end plate body 51 and a copper busbar structure, wherein the copper busbar structure is partially embedded in the end plate body and includes a first exposed portion 1, a second exposed portion 3, and a copper busbar body 2; a first end of the copper busbar body 2 is fixedly connected to a first end of the first exposed portion 1, and a second end of the copper busbar body 2 is fixedly connected to a first end of the second exposed portion 3;

[0059] The second exposed portion 3 includes a third step 31 and a fourth step 32 . The third step 31 is fixedly connected to the first end of the copper busbar body 2 . The third step 31 and the fourth step 32 are integrally formed. The horizontal plane of the fourth step 32 is lower than that of the third step 31 .

[0060] In one embodiment, only the second exposed portion 3 can be set to the shape of a third step 31 and a fourth step 32, and a corresponding abutment structure is used in the injection molding device. Abutting on the fourth step 32 structure can prevent the injection glue from flowing into the surface of the battery end plate through the gap, thereby avoiding the occurrence of glue overflow. Secondly, setting a step structure can enable the abutment structure to press the battery end plate tightly. Under the pressure during the injection molding process, it can also prevent the battery end plate from being distorted or deformed, thereby ensuring the yield of the finished product and protecting the injection molding device.

[0061] Reference Figure 4-6 The present invention also provides an injection molding device for injection molding the battery end plate, comprising:

[0062] Injection molding device body 45, mold front mold slide and the rear mold slider;

[0063] The mold front mold slide and the rear mold slider are slidably connected to the injection molding device body 45, and the mold front mold slide, the rear mold slider and the injection molding device body constitute an injection cavity;

[0064] The front mold slide is used to abut against the second exposed part 3, and the rear mold slider is used to abut against the first exposed part 1.

[0065] In this embodiment, during the injection molding process, the battery end plate can be pressed by the mold front mold slide abutting the second exposed part 3 and the rear mold slider abutting the first exposed part 1, and then the resin injection glue is injected into the injection cavity. It should be noted that the injection cavity specifically includes two, the mold front mold slide includes a first mold front mold slide 41 and a second mold front mold slide 42, and the rear mold slider includes a first rear mold slider 43 and a second rear mold slider 44. The first mold front mold slide 41 and the second mold front mold slide 42 are in contact and connected, and the first rear mold slider 43 and the second rear mold slider 44 are in contact and connected. The second mold front mold slide 42 is provided with a step structure that is compatible with the fourth step 32, and the first rear mold slider 43 is provided with a step that is compatible with the second step 12. Structure, and the first mold front mold slide 41, the second mold front mold slide 42, the first rear mold slider 43 and the second rear mold slider 44 are all slidably connected to the injection molding device body 45; the first mold front mold slide 41, the first rear mold slider 43, the second rear mold slider 44, the injection molding device body 45, the back of the first exposed part 1, the back of the second exposed part 3 and the copper busbar body 2 form a first cavity 47, and the injection molding device body 45, the first mold front mold slide 41 and the copper busbar body 2 form a second cavity 48, which can ensure that the upper end of the first exposed part 1 and the upper end of the second exposed part 3 are exposed. As for the structure of the first cavity 47 and the structure of the second cavity 48, this application does not limit this. Without affecting the assembly, all cavity structures should be within the protection scope of this application.

[0066] In one embodiment, the first exposed part 1 includes a first step 11 and a second step 12, the first step 11 and the second step 12 are integrally formed, the first step 11 is fixedly connected to the copper busbar body 2, and the horizontal plane of the second step 12 is lower than the first step 11, the second exposed part 3 includes a third step 31 and a fourth step 32, the third step 31 is fixedly connected to the first end of the copper busbar body 2, the third step 31 and the fourth step 32 are integrally formed, and the horizontal plane of the fourth step 32 is lower than the third step 31; the front mold slide of the mold has a step structure adapted to the fourth step 32, and the front mold slide of the mold abuts the fourth step 32 through the adapted step structure; the rear mold slider has a step structure adapted to the second step 12, and the rear mold slider abuts the second step 12 through the adapted step structure.

[0067] In this embodiment, the front mold slide of the mold abuts against the fourth step 32 through the corresponding step structure; the rear mold slider has a step structure that is compatible with the second step 12, and the rear mold slider abuts against the second step 12 through the compatible step structure, which can make the abutment more secure and ensure the clamping strength of the battery end plate. In addition, the compatible step structure can effectively prevent glue overflow.

[0068] In one embodiment, an ejector pin 46 is further included. The ejector pin 46 is slidably connected to the injection molding device body 45 . The end of the ejector pin 46 is disposed in the injection molding cavity for abutting against the copper busbar body 2 .

[0069] In this embodiment, a plurality of ejector pins 46 may be provided on both sides of the copper busbar body 2 , so as to further fix the battery end plate and prevent the battery end plate from moving during the injection molding process.

[0070] Reference Figure 7-9 The present invention further provides a battery pack, comprising: an electrical connector 52 and at least two battery modules, wherein the battery module comprises a battery cell stack and two battery end plates prepared by the above-mentioned injection molding device;

[0071] The two ends of the battery cell stack are respectively fixedly connected to the two end plate bodies 51, wherein the second exposed portion 3 of one of the copper busbar structures is electrically connected to the positive pole ear of the battery cell stack, and the second exposed portion 3 of the other copper busbar structure is electrically connected to the negative pole ear of the battery cell stack, and the two ends of the electrical connector 52 are respectively electrically connected to the first exposed portions 1 of two different adjacent battery end plates to realize the series connection between the two battery modules.

[0072] It should be noted that the battery cell stack includes multiple battery cells, the positive electrode ear of the upper battery cell is connected to the negative electrode ear of the next battery cell, and they are stacked in sequence to form a battery cell stack. The positive electrode ear and the negative electrode ear of a single battery cell stack are respectively fixedly connected to two battery end plates to form a single battery module, and the two ends of the electrical connector 52 are respectively electrically connected to the first exposed parts 1 of two different adjacent battery end plates, forming a series connection between the battery modules, thereby forming a battery pack.

[0073] The beneficial effects of the present invention are as follows: by arranging a stepped shape on the first exposed part 1 and / or the second exposed part 3 to form a "Z"-shaped stop structure, during the injection molding process, a corresponding abutment structure can be used in the injection molding device to abut against the stepped structure on the first exposed part 1 and / or the second exposed part 3, which can prevent the injection glue from flowing into the surface of the battery end plate through the gap, thereby avoiding the occurrence of glue overflow. Secondly, arranging the stepped structure can enable the abutment structure to press the battery end plate tightly, which can also prevent the battery end plate from being distorted or deformed under the pressure during the injection molding process, thereby ensuring the yield of the finished product and protecting the injection molding device.

[0074] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be within the scope of the claims of the present invention.

Claims

1. A battery end plate, characterized in that: include: An end plate body and a copper busbar structure, wherein the copper busbar structure is partially embedded in the end plate body and includes a first exposed portion, a second exposed portion, and a copper busbar body; The first exposed portion includes a first step and a second step, the first step and the second step are integrally formed, the first step is fixedly connected to the copper busbar body, the horizontal plane of the second step is lower than the first step, and the second exposed portion is connected to the copper busbar body.

2. The battery end plate according to claim 1, wherein: The second exposed portion includes a third step and a fourth step. The third step is fixedly connected to the first end of the copper busbar body. The third step and the fourth step are integrally formed. The horizontal plane of the fourth step is lower than that of the third step.

3. The battery end plate according to claim 1, wherein: The copper busbar body is provided with at least one through hole.

4. The battery end plate according to claim 3, wherein: The through hole is a through circular hole, and the diameter of the through circular hole is 1mm-10mm.

5. The battery end plate according to claim 4, wherein: The diameter of the through circular hole is 2mm-4mm.

6. A battery end plate, characterized in that: include: An end plate body and a copper busbar structure, wherein the copper busbar structure is partially embedded in the end plate body and includes a first exposed portion, a second exposed portion, and a copper busbar body; a first end of the copper busbar body is fixedly connected to a first end of the first exposed portion, and a second end of the copper busbar body is fixedly connected to a first end of the second exposed portion; The second exposed portion includes a third step and a fourth step. The third step is fixedly connected to the first end of the copper busbar body. The third step and the fourth step are integrally formed. The horizontal plane of the fourth step is lower than that of the third step.

7. An injection molding device for preparing the battery end plate according to any one of claims 1 to 6, characterized in that: include: Injection molding device body, mold front mold slide and rear mold slider; The mold front mold slide and the rear mold slider are slidably connected to the injection molding device body, and the mold front mold slide, the rear mold slider and the injection molding device body constitute an injection cavity; The front mold slide is used to abut against the second exposed part, and the rear mold slider is used to abut against the first exposed part.

8. The injection molding device according to claim 7, characterized in that The battery end plate is the battery end plate according to claim 2, the mold front mold slide has a step structure adapted to the fourth step, and the mold front mold slide abuts against the fourth step through the adapted step structure; The rear mold slider has a step structure adapted to the second step, and the rear mold slider abuts against the second step through the adapted step structure.

9. The injection molding device according to claim 8, characterized in that The mold front mold slide includes a first mold front mold slide and a second mold front mold slide, and the rear mold slider includes a first rear mold slider and a second rear mold slider; The front mold slide of the first mold is in contact with the front mold slide of the second mold, the first rear mold slider is in contact with the second rear mold slider, the front mold slide of the second mold is provided with a stepped structure adapted to the fourth step, and the first rear mold slider is provided with a stepped structure adapted to the second step; The first mold front mold slide, the second mold front mold slide, the first rear mold slide block and the second rear mold slide block are all slidably connected to the injection molding device body; A first cavity consisting of the first mold front mold slide, the first rear mold slider, the second rear mold slider, the injection molding device body, the back surface of the first exposed part, the back surface of the second exposed part, and the copper busbar body; The second cavity is formed by the injection molding device body, the first mold front mold slide and the copper busbar body.

10. The injection molding device according to claim 7, wherein: It also includes an ejector pin, which is slidably connected to the injection molding device body. The end of the ejector pin is arranged in the injection molding cavity and is used to abut against the copper busbar body.

11. A battery pack, characterized in that: include: An electrical connector and at least two battery modules, wherein the battery module comprises a battery cell stack and two battery end plates prepared by the injection molding device according to any one of claims 7 to 10; The two ends of the battery cell stack are respectively fixedly connected to the two end plate bodies, the second exposed part of one of the copper busbar structures is electrically connected to the positive electrode ear of the battery cell stack, and the second exposed part of the other copper busbar structure is electrically connected to the negative electrode ear of the battery cell stack, and the two ends of the electrical connector are respectively electrically connected to the first exposed parts of two different adjacent battery end plates to realize the series connection between the two battery modules.

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