Cover plate, battery cell and battery pack

Abstract

The utility model discloses a cover plate, a battery cell and a battery pack, the cover plate comprises a cover plate main body, a pole and a first bulge, the pole comprises a pole main body and a pole plate body, the pole main body is arranged on the pole plate body and penetrates through the cover plate main body, and the first bulge is arranged on one side, far away from the cover plate main body, of the pole plate body. In the specific assembling process of the battery cell, the two pole cores are arranged on the two sides of the cover plate side by side, the tabs of the two pole cores are attached and positioned to the two sides of the first protrusion respectively, and after positioning is completed, the tabs and the pole column plate body are welded; after welding is completed, the two pole cores are turned by 90 degrees towards the direction close to each other for core combination, so that the two pole cores are changed from side-by-side arrangement to stacking arrangement in the same direction to form a whole, and subsequent assembly of the battery core can be performed at the moment. Through the arrangement of the first bulge, the accurate positioning of the tab welding position of the pole core is realized, so that the tearing problem caused by the bending of the tab during core closing is avoided, and the quality and the safety performance of the battery core are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, and more particularly to a cover plate, a battery cell and a battery pack. BACKGROUND

[0002] The bipolar core structure of the energy storage battery is mainly manufactured by using the butterfly welding process, that is, the tabs of two core poles are welded, and then the core poles are rotated by 90 degrees to realize core combination. However, the tabs of the current core are prone to tearing during the core combination process, which directly affects the performance of the core. Therefore, how to solve the problem that the tabs are prone to tearing during the core combination process has become a technical problem to be solved by the technical personnel in the field. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the purpose of the present application is to provide a cover plate to solve the problem that the tabs are prone to tearing during the core combination process and to ensure the performance of the core.

[0004] Another purpose of the present application is to provide a battery cell comprising the cover plate.

[0005] Still another purpose of the present application is to provide a battery pack comprising the battery cell.

[0006] To achieve the above purpose, the present application provides the following technical solution:

[0007] A top cover, comprising:

[0008] a cover plate body;

[0009] a pole, comprising a pole body and a pole plate body, the pole body being arranged on the pole plate body, and the pole body penetrating the cover plate body;

[0010] a first protrusion arranged on a side of the pole plate body away from the cover plate body.

[0011] Optionally, in the cover plate described above, a first mounting hole is formed through the cover plate body, and a pole connecting protrusion is arranged on a side of the cover plate body away from the pole plate body.

[0012] The pole body penetrates the first mounting hole and is electrically connected with the pole connecting protrusion.

[0013] Optionally, in the cover plate described above, a first insulating plate is arranged between the cover plate body and the pole plate body, a first avoiding hole is formed through the first insulating plate and communicates with the first mounting hole, the pole body penetrates the first avoiding hole, and the first insulating plate is made of an insulating material.

[0014] Optionally, in the cover plate described above, the first insulating plate has a second protrusion on the side away from the cover plate body that abuts against the pole core.

[0015] Optionally, in the cover plate described above, a sealing element is provided between the pole plate and the first insulating plate, and the pole body passes through the sealing element.

[0016] Optionally, in the cover plate described above, a second insulating plate is provided between the cover plate body and the pole post. The second insulating plate has a second clearance hole that communicates with the first mounting hole. The pole post body passes through the second clearance hole. The second insulating plate is made of insulating material.

[0017] Optionally, in the cover plate described above, a second mounting hole is provided on the side of the pole facing the cover plate body. The second mounting hole communicates with the first mounting hole and allows the pole body to be embedded.

[0018] Optionally, in the above-mentioned cover plate, there are two pole plates, which are spaced apart on the first side of the cover plate body, and the first protrusions on the two pole plates respectively abut and position with the positive and negative tabs of the pole core.

[0019] Optionally, in the above-mentioned cover plate, a first injection hole is provided through the cover plate body, and the first injection hole is sealed by a sealing member.

[0020] A battery cell, comprising:

[0021] case;

[0022] A base plate is disposed at the first end of the housing;

[0023] Two pole pieces are disposed within the housing;

[0024] The aforementioned cover plate is disposed at the second end of the housing, and the two electrode tabs of the two electrode cores respectively abut against and are positioned on both sides of the first protrusion, and are connected to the electrode plate.

[0025] Optionally, in the above-mentioned battery cell, the two electrode cores are covered with an insulating film.

[0026] A battery pack comprising at least one of the aforementioned cells connected in series and parallel.

[0027] The cover plate provided in this application includes a cover plate body, a pole post, and a first protrusion. The pole post includes a pole post body and a pole post plate. The pole post body is disposed on the pole post plate and penetrates the cover plate body to transmit the core current. The first protrusion is disposed on the side of the pole post plate away from the cover plate body, and the two sides of the first protrusion are used to abut and position the pole tabs of the pole post. In the specific assembly process of the battery cell, the two pole posts are first arranged side by side on both sides of the cover plate, and the pole tabs of the two pole posts are respectively fitted and positioned with the two sides of the first protrusion. After positioning, the pole tabs are welded to the pole post plate. After welding, the two pole posts are rotated 90° in the direction of mutual approach to join them, so that the two are changed from side by side to stacked in the same direction and form a whole. At this time, the pole tabs of the two pole posts are still arranged on both sides of the first protrusion, and the subsequent assembly of the battery cell can be carried out.

[0028] Compared to existing technologies, the cover plate provided in this application, through the setting of the first protrusion, allows the two electrode tabs of the electrode core to abut against the two sides of the first protrusion respectively when the electrode tabs of the electrode core are welded to the electrode post plate, thereby achieving precise positioning of the electrode tab welding position, thus avoiding the tearing problem caused by the bending of the electrode tabs during core assembly, and improving the quality and safety performance of the battery cell.

[0029] The battery cell provided in this application includes a housing, a base plate, electrode cores, and the aforementioned cover plate. The base plate is located at the first end of the housing, and two electrode cores are disposed inside the housing. The cover plate is located at the second end of the housing. The tabs of the two electrode cores respectively abut and are positioned against the two sides of the first protrusion and connected to the electrode plate. Because it includes the aforementioned cover plate, it also possesses the aforementioned structure and beneficial effects. Other structural features are described in the prior art and will not be repeated here.

[0030] The battery pack provided in this application includes at least one of the above-mentioned cells connected in series and parallel, so it also has the above-mentioned structure and beneficial effects. Other structures refer to the prior art and will not be described in detail here. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is an exploded view of the cover plate disclosed in the embodiments of this application;

[0033] Figure 2 This is an isometric view of the cover plate disclosed in the embodiments of this application;

[0034] Figure 3This is a schematic diagram of the bipolar core tab welding disclosed in an embodiment of this application;

[0035] Figure 4 This is a schematic diagram of the internal structure of the battery cell disclosed in the embodiments of this application;

[0036] Figure 5 This is a schematic diagram of the appearance of the battery cell disclosed in the embodiments of this application;

[0037] Figure 6 This is a schematic diagram of a pole plate body disclosed in an embodiment of this application;

[0038] Figure 7 This is a schematic diagram of another structure of the pole plate disclosed in the embodiments of this application.

[0039] Among them, 100 is the pole plate body, 101 is the first protrusion, 102 is the pole body, 110 is the sealing element, 120 is the first insulating plate, 121 is the side protrusion, 122 is the end protrusion, 123 is the first clearance hole, 124 is the second injection hole, 130 is the cover plate body, 131 is the first injection hole, 132 is the first mounting hole, 140 is the second insulating plate, 141 is the second clearance hole, 150 is the pole connection protrusion, and 151 is the second mounting hole;

[0040] 200 is the core electrode, 201 is the positive electrode tab, and 202 is the negative electrode tab;

[0041] 300 is the casing, and 310 is the insulating film;

[0042] 400 is the base plate, 410 is the third insulation plate, and 420 is the explosion-proof valve. Detailed Implementation

[0043] The core of this application is to disclose a cover plate to solve the problem that the tabs are easily torn during the core assembly process, thereby ensuring the performance of the battery cell.

[0044] Another key aspect of this application is the disclosure of a battery cell that includes the aforementioned cover plate.

[0045] Another key aspect of this application is the disclosure of a battery pack comprising the aforementioned cells.

[0046] Hereinafter, embodiments will be described with reference to the accompanying drawings. Furthermore, the embodiments shown below do not limit the scope of the utility model as described in the claims. Additionally, the complete contents of the structures represented in the embodiments below are not limited to those necessary for the solution of the utility model as described in the claims. It should be noted that, for ease of description, only the parts relevant to the utility model are shown in the drawings. Unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0047] CombinationFigures 1-5 The cover plate disclosed in this application includes a cover plate body 130, an electrode post, and a first protrusion 101. The electrode post includes an electrode post body 102 and an electrode post plate 100. The electrode post body 102 is disposed on the electrode post plate 100 and penetrates the cover plate body 130 to transmit current to the electrode core 200. The first protrusion 101 is disposed on the side of the electrode post plate 100 away from the cover plate body 130, and the two sides of the first protrusion 101 are used to abut and position with the electrode tabs of the electrode core 200.

[0048] In the specific assembly process of the battery cell, the two electrode cores 200 are first arranged side by side on both sides of the cover plate, and the tabs of the two electrode cores 200 are respectively attached and positioned to the sides of the first protrusion 101. After positioning, the tabs are welded to the electrode plate 100. After welding, the two electrode cores 200 are rotated 90° in the direction of mutual approach to join the cores, so that the two are changed from being arranged side by side to being stacked in the same direction and forming a whole. At this time, the tabs of the two electrode cores 200 are still arranged on both sides of the first protrusion 101, and the subsequent assembly of the battery cell can be carried out.

[0049] Compared to existing technologies, the cover plate disclosed in this application, through the setting of the first protrusion 101, allows the two tabs of the electrode core 200 to abut against the two sides of the first protrusion 101 respectively when the tabs of the electrode core 200 are welded to the electrode post plate 100, thereby achieving precise positioning of the electrode tab welding position of the electrode core 200, thus avoiding the tearing problem caused by the bending of the tabs during core assembly, and improving the quality and safety performance of the battery cell.

[0050] For example, in combination Figure 2 A first protrusion 101 can be provided on an electrode plate 100. The first protrusion 101 can be a strip structure, and its two sides can respectively abut and position with the tabs of the two electrode cores 200. The structure is simple and easy to manufacture; combined with Figure 6 Two strip-shaped first protrusions 101 can be arranged side-by-side and spaced apart on a single electrode plate 100. The sides of the two first protrusions 101 that are far apart from each other can respectively abut and be positioned with the tabs of the two electrode cores 200. This method uses less material and makes the battery cell lighter. Figure 7 The multiple block-shaped first protrusions 101 arranged side by side and spaced apart can also play a technical role in positioning the electrode tabs, and have the advantages of reducing material usage and reducing cell weight.

[0051] Specifically, the protrusion height of the first protrusion 101 on the pole plate 100 can be set in the range of 0.2mm to 1mm.

[0052] In a specific embodiment disclosed in this application, a first mounting hole 132 is provided through the cover plate body 130, and a pole connection protrusion 150 is provided on the side of the cover plate body 130 away from the pole plate body 100. The pole body 102 passes through the first mounting hole 132 and is electrically connected to the pole connection protrusion 150 to transmit current. The provision of the pole body 102 ensures a reliable electrical connection between the pole plate body 100 and the pole connection protrusion 150. Specifically, the pole body 102 may be cylindrical or cubic.

[0053] Furthermore, in order to improve the insulation performance of the cover plate, a first insulating plate 120 is provided between the cover plate body 130 and the pole plate body 100. The first insulating plate 120 has a first clearance hole 123 that communicates with the first mounting hole 132. The pole body 102 passes through the first clearance hole 123 and the first mounting hole 132 in sequence and is electrically connected to the pole connecting protrusion 150. The first insulating plate 120 can be made of plastic insulating materials such as polyphenylene sulfide, polyimide, polyamide, and polyethylene to ensure good insulation and isolation between the pole core 200 inside the cell and the outside world.

[0054] Combination Figure 1 and Figure 2 A second protrusion is provided on the side of the first insulating plate 120 away from the cover plate body 130 for abutting against the electrode core 200. The second protrusion prevents the electrode core from moving inside the cell housing 300, thus improving the safety performance of the cell. For example, in combination with... Figure 2 The second protrusion may specifically include two end protrusions 122 and two side protrusions 121. The two end protrusions 122 are respectively disposed at both ends of the first insulating plate 120, and the two side protrusions 121 are respectively disposed on both sides of the first insulating plate 120. The side protrusions 121 are positioned to avoid the installation position of the electrode tab, and also to avoid the position of the electrode tab on the cover plate before the core is closed.

[0055] Combination Figure 1 and Figure 4 A sealing element 110 is provided between the electrode plate 100 and the first insulating plate 120, and the electrode body 102 passes through the sealing element 110. The sealing element 110 is used to seal the electrode plate 100 and the first insulating plate 120 at the electrode body 102 to prevent leakage of the battery cell at the first mounting hole 132 and improve the safety of the battery cell. Specifically, the sealing element 110 is annular, and its inner ring through which the electrode body 102 passes is adapted to the cross-sectional shape of the electrode body 102.

[0056] Furthermore, a second insulating plate 140 is provided between the cover plate body 130 and the pole post connecting protrusion 150. The second insulating plate 140 has a second clearance hole 141 that communicates with the first mounting hole 132. The pole post body 102 passes through the first clearance hole 123, the first mounting hole 132 and the second clearance hole 141 in sequence and is electrically connected to the pole post connecting protrusion 150. The second insulating plate 140 can be made of plastic insulating materials such as polyphenylene sulfide, polyimide, polyamide, and polyethylene to achieve an insulating connection between the cover plate body 130 and the pole post connecting protrusion 150, prevent the metal cover plate body 130 from becoming charged, and thus ensure the insulation and safety performance of the battery cell.

[0057] Combination Figure 1 To ensure the effective positioning and installation of the pole connecting protrusion 150 and the pole body 102, a second mounting hole 151 is provided on the side of the pole connecting protrusion 150 facing the cover plate body 130. The second mounting hole 151 communicates with the first mounting hole 132. During assembly, the pole body 102 is embedded in the second mounting hole 151. The shape of the second mounting hole 151 matches that of the pole body 102 to facilitate assembly and ensure a tight fit between the two, thus guaranteeing the reliability of the electrical connection.

[0058] Combination Figure 3 The electrode core 200 has two tabs: a positive tab 201 and a negative tab 202. Since the positive tab 201 and negative tab 202 are usually located on the same side of the electrode core 200, in order to simultaneously position the positive tab 201 and negative tab 202, a combination of... Figure 1 and Figure 2 There are two pole plate bodies 100, which are spaced apart on the first side of the cover plate body 130. The two pole plate bodies 100 are welded to the positive electrode tab 201 and the negative electrode tab 202 of the pole core 200, respectively. The first protrusion 101 on the two pole plate bodies 100 abuts and positions itself against the positive electrode tab 201 and the negative electrode tab 202 of the pole core 200, respectively.

[0059] Combination Figure 5 Each of the two pole plate bodies 100 corresponds to a pole connection protrusion 150. The two pole connection protrusions 150 correspond to the positive electrode tab 201 and the negative electrode tab 202, respectively, for the introduction and extraction of current. The second insulating plate 140 can be two plates arranged in a one-to-one correspondence with the pole connection protrusions 150.

[0060] After the battery cell assembly is completed, electrolyte needs to be added into the cell through the injection port. If the injection port is located on the cover plate, then... Figure 1 and Figure 2A first injection hole 131 is formed through the cover plate body 130, and a second injection hole 124 is formed through the first insulating plate 120. The second injection hole 124 communicates with the first injection hole 131 for electrolyte injection. After injection, the first injection hole 131 and the second injection hole 124 are sealed by a sealing component to prevent leakage. The sealing component includes one or more combinations of sealing pins, sealant, heat shrink tubing, and sealing gaskets to ensure the sealing effect of the battery cell.

[0061] Combination Figure 4 The battery cell disclosed in this application includes a housing 300, a base plate 400, electrode cores 200, and the aforementioned cover plate. The base plate 400 is disposed at the first end of the housing 300. There are two electrode cores 200, which are disposed inside the housing 300. The cover plate is disposed at the second end of the housing 300. The tabs of the two electrode cores 200 respectively abut and are positioned against both sides of the first protrusion 101 and connected to the electrode post plate 100. Since the cover plate is included, it also has the aforementioned structure and beneficial effects. Other structures refer to the prior art and will not be described in detail here.

[0062] In one specific embodiment, the electrode core 200 is formed by alternating layers of positive electrode plates, negative electrode plates, and separators. Before assembling the battery cell, the positive electrode tabs 201 of the electrode core 200 are connected to form a whole by means of ultrasonic welding or the like, and the negative electrode tabs 202 of the electrode core 200 are connected to form a whole by means of ultrasonic welding or the like, and then combined... Figure 3 The two pole cores 200 are placed side by side on both sides of the cover plate, and the pole tabs of the two pole cores 200 are respectively positioned by contacting the two sides opposite to the first protrusion 101. After positioning, the pole tabs are welded to the pole plate 100. After welding, the two pole cores 200 are rotated 90° towards each other to be joined together, and then subsequent assembly can be carried out.

[0063] To ensure the insulation performance of the battery cell, the two electrode cores 200 are covered with an insulating film 310. The insulating film 310 is made of materials including, but not limited to, polyimide, polyethylene, polypropylene, polyvinylidene fluoride, polyester, and glass fiber reinforced plastic. Figure 4 After the two electrode cores 200 are joined together, the insulating film 310 is used to completely wrap the surface of the whole formed by the two electrode cores 200 except for the electrode tabs, before placing it inside the cell housing 300. Finally, the rest of the cell assembly is completed. After assembly, the second protrusion on the first insulating plate 120 abuts against the insulating film 310, forming a complete seal between the housing 300 and the electrode cores 200.

[0064] Further optimize the plan, combined with Figure 4A third insulating plate 410 is provided on the side of the base plate 400 facing the interior of the housing 300. The third insulating plate 410 is made of plastic insulating materials such as polyphenylene sulfide, polyimide, polyamide, and polyethylene to improve the support capacity of the base plate 400 and to provide insulation between the electrode core 200 and the base plate 400. An explosion-proof valve 420 can be installed on the base plate 400 or the cover plate. It can automatically open and release excessive pressure when the internal pressure of the cell reaches a certain value, thereby preventing the cell from exploding or being damaged.

[0065] The battery pack disclosed in this application includes at least one of the aforementioned cells connected in series and parallel, thus possessing the same structure and beneficial effects as described above. Other structures refer to existing technologies and will not be elaborated upon here. Specifically, when the battery pack includes one of the aforementioned cells, the cell is connected in series and parallel. When the battery pack includes multiple of the aforementioned cells, the multiple cells can be electrically connected using a series-parallel connection method, such as first connecting in series and then in parallel, or first connecting in parallel and then in series. The battery pack disclosed in this application includes, but is not limited to, battery packs, battery clusters, or other possible cell assembly configurations.

[0066] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Specific technical means in some embodiments may be incorporated, in whole or in part, into another embodiment unless explicitly excluded by another embodiment. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A cover plate, characterized in that, include: Cover plate body (130); The pole includes a pole body (102) and a pole plate (100), wherein the pole body (102) is disposed on the pole plate (100) and the pole body (102) penetrates the cover plate body (130). The first protrusion (101) is disposed on the side of the pole plate (100) away from the cover plate body (130).

2. The cover plate as described in claim 1, characterized in that, The cover plate body (130) has a first mounting hole (132) through it, and the cover plate body (130) has a pole connection protrusion (150) on the side away from the pole plate body (100). The pole body (102) passes through the first mounting hole (132) and is electrically connected to the pole connection protrusion (150).

3. The cover plate as described in claim 2, characterized in that, A first insulating plate (120) is provided between the cover plate body (130) and the pole plate body (100). A first clearance hole (123) communicating with the first mounting hole (132) is provided on the first insulating plate (120). The pole body (102) passes through the first clearance hole (123). The first insulating plate (120) is made of insulating material.

4. The cover plate as described in claim 3, characterized in that, The first insulating plate (120) has a second protrusion on the side away from the cover plate body (130) that abuts against the pole core (200).

5. The cover plate as described in claim 3, characterized in that, A sealing element (110) is provided between the pole plate (100) and the first insulating plate (120), and the pole body (102) passes through the sealing element (110).

6. The cover plate as described in claim 2, characterized in that, A second insulating plate (140) is provided between the cover plate body (130) and the pole connecting protrusion (150). The second insulating plate (140) has a second clearance hole (141) that communicates with the first mounting hole (132). The pole body (102) passes through the second clearance hole (141). The second insulating plate (140) is made of insulating material.

7. The cover plate as described in claim 2, characterized in that, The pole connecting protrusion (150) facing the cover plate body (130) has a second mounting hole (151), which communicates with the first mounting hole (132) and allows the pole body (102) to be inserted.

8. The cover plate as claimed in claim 1, characterized in that, There are two pole plate bodies (100), which are spaced apart on one side of the cover plate body (130). The first protrusion (101) on the two pole plate bodies (100) respectively abuts and positions with the positive electrode tab (201) and negative electrode tab (202) of the pole core (200).

9. The cover plate as claimed in claim 1, characterized in that, The cover plate body (130) has a first injection hole (131) through it, and the first injection hole (131) is sealed by a plug.

10. A battery cell, characterized in that, include: Housing (300); A base plate (400) is disposed at the first end of the housing (300); Two pole pieces (200) are disposed within the housing (300); The cover plate as described in any one of claims 1-9 is disposed at the second end of the housing (300), and the tabs of the two pole cores (200) are respectively positioned to abut against the two sides of the first protrusion (101) and connected to the pole plate (100).

11. The battery cell as described in claim 10, characterized in that, The two pole pieces (200) are covered with an insulating film (310).

12. A battery pack, characterized in that, Includes at least one cell as described in claim 10 or 11 connected in series or parallel.

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