Single battery cell, battery module and battery pack

Abstract

The present application discloses a single cell, a battery module and a battery pack. Among them, the single cell includes a housing, a top cover, an electrode core and potting glue. The top cover includes a cover body, pins and pole columns. The pole columns penetrate through the cover body. The pins include a connecting portion and a lead-out portion. The connecting portion and the lead-out portion are connected to each other. The connecting portion is connected to the pole column. The cover body is buckled on the housing, and the pins are accommodated inside the housing. The electrode core is accommodated inside the housing. The electrode core includes a body and electrode tabs. The electrode tabs are connected to the lead-out portion. The potting glue covers the electrode tabs and the lead-out portion. The potting glue can play a certain role in fixing the electrode tabs and the lead-out portion, reducing the possibility of breakage between the electrode tabs and the lead-out portion. And it can reduce or eliminate the gaps between the electrode tabs and the housing, and between the lead-out portion and the housing, enhance the restraint on the electrode tabs and the lead-out portion, reduce the moving space of the electrode core in the housing, and reduce the possibility of problems such as deformation of the lead-out portion, interlayer misalignment of the electrode plates of the electrode core, cracking of the electrode tabs, and internal short circuit caused by contact with the housing.

Description

Technical Field

[0001] This application relates to the technical field of power batteries, and particularly to a single battery, a battery module, and a battery pack. Background Art

[0002] In related technologies, the top cover of a single battery usually leads out two pins, which are respectively welded to the positive tab and negative tab of the battery cell. The restraint and fixation of the battery cell completely rely on the connection between the positive and negative tabs and the pins. There is a certain gap between the pins and the housing, resulting in insufficient restraint of the battery cell and a large movement space. The stability between the pins and the battery cell is insufficient. Under working conditions of vibration or impact, on the one hand, the pins are prone to deformation or even fracture, causing problems such as zero voltage, internal short circuit, and liquid leakage. On the other hand, the battery cell is prone to problems such as interlayer misalignment of the electrode sheets, tab cracking, and internal short circuit caused by contact with the housing, with poor safety performance. Summary of the Invention

[0003] This application aims to solve at least one of the technical problems existing in the prior art. For this purpose, this application provides a single battery that can improve the stability between the pins and the battery cell, thereby improving the safety performance of the single battery.

[0004] This application also provides a battery module having the above single battery.

[0005] This application also provides a battery pack having the above battery module.

[0006] The single battery provided in the first aspect embodiment of this application includes a housing, a top cover, a battery cell, and potting glue. The top cover includes a cover body, pins, and a pole column. The pole column penetrates through the cover body. The pins include a connecting portion and a leading-out portion. The connecting portion and the leading-out portion are connected to each other. The connecting portion is connected to the pole column. The cover body is buckled on the housing. The pins are accommodated inside the housing. The battery cell is accommodated inside the housing. The battery cell includes a body and tabs. The tabs are connected to the leading-out portion. The potting glue covers the tabs and the leading-out portion.

[0007] The single battery provided in the first aspect embodiment of this application has at least the following beneficial effects: The potting glue covers the tabs and the leading-out portion, which can play a certain fixing role and reduce the possibility of fracture between the tabs and the leading-out portion. And it can reduce or eliminate the gaps between the tabs and the housing, and between the leading-out portion and the housing, enhance the restraint on the tabs and the leading-out portion, reduce the movement space of the battery cell in the housing, and reduce the possibility of problems such as deformation of the leading-out portion, interlayer misalignment of the electrode sheets of the battery cell, tab cracking, and internal short circuit caused by contact with the housing, thereby improving the safety performance of the single battery.

[0008] In some embodiments of the present application, the potting glue is filled in the gaps between the housing and the tab and between the housing and the lead-out portion.

[0009] In some embodiments of the present application, the housing is provided with a glue injection hole for injecting the potting glue into the interior of the housing.

[0010] In some embodiments of the present application, the glue injection hole is located at a corresponding position of the tab or the lead-out portion.

[0011] In some embodiments of the present application, a sealing member is further included, and the sealing member is connected to the housing and covers the glue injection hole.

[0012] In some embodiments of the present application, the housing is provided with a sealing groove, the glue injection hole is opened at the bottom of the sealing groove, and the sealing member is embedded in the sealing groove.

[0013] In some embodiments of the present application, the cover body is provided with a glue injection hole for injecting the potting glue into the interior of the housing.

[0014] In some embodiments of the present application, a baffle is further included. The baffle is connected to the inner wall of the housing and the end of the body near the tab. The housing, the tab and the baffle define a potting cavity, and the potting glue is filled in the potting cavity.

[0015] The battery module provided by the second aspect embodiment of the present application includes a busbar and the single battery provided by any one of the first aspect embodiments of the present application. A plurality of the single batteries are stacked in sequence; a plurality of busbars are provided, and the plurality of busbars are connected to the pole columns to electrically connect the plurality of single batteries.

[0016] The battery module provided by the second aspect embodiment of the present application has at least the following beneficial effects: By using a single battery that can improve the stability between the pins and the battery cell and has a relatively high safety performance, the safety performance of the battery module can be improved.

[0017] The battery pack provided by the third aspect embodiment of the present application includes a box body and the battery module provided by any one of the second aspect embodiments of the present application, and the battery module is accommodated inside the box body.

[0018] The battery pack provided by the third aspect embodiment of the present application has at least the following beneficial effects: By using a battery module with relatively high safety performance, the safety performance of the battery pack can be improved.

[0019] The additional aspects and advantages of the present application will be partially given in the following description, partially become apparent from the following description, or be understood through the practice of the present application. Description of the Drawings

[0020] The following further describes the present application in conjunction with the accompanying drawings and embodiments, where:

[0021] Figure 1 is a three-dimensional schematic diagram of a single battery provided by some embodiments of the first aspect of the present application;

[0022] Figure 2 is Figure 1 a cross-sectional view of the A-A section in;

[0023] Figure 3 is Figure 1 a cross-sectional view of the B-B section in;

[0024] Figure 4 is Figure 1 an exploded view of the single battery shown;

[0025] Figure 5 is Figure 1 a glue injection schematic diagram of the single battery shown;

[0026] Figure 6 is a glue injection schematic diagram of a single battery provided by some other embodiments of the first aspect of the present application;

[0027] Figure 7 is a three-dimensional schematic diagram of a single battery provided by some other embodiments of the first aspect of the present application;

[0028] Figure 8 is Figure 7 a cross-sectional view of the C-C section in;

[0029] Figure 9 is Figure 7 a cross-sectional view of the C-C section of the single battery before potting shown.

[0030] Reference numerals:

[0031] housing 100, glue injection hole 110, sealing groove 120, top cover 200, cover body 210, pin 220, connecting portion 221, lead-out portion 222, pole column 230, battery cell 300, body 310, tab 320, potting adhesive 400, seal 500, baffle 600, potting cavity 700. Detailed implementation manners

[0032] The following details the embodiments of the present application. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and should not be construed as a limitation of the present application.

[0033] In the description of the present application, it should be understood that with respect to the orientation description, for example, the orientation or positional relationship indicated by up, down, left, right, etc. is based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application.

[0034] In the description of the present application, unless otherwise clearly defined, terms such as "arrangement", "installation", "connection", etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above terms in the present application in combination with the specific content of the technical solution.

[0035] In the description of the present application, the description referring to terms such as "one embodiment", "some embodiments", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0036] The single cell provided by the first aspect embodiment of the present application includes a housing 100, a top cover 200, an electric core 300 and a potting adhesive 400. The top cover 200 includes a cover body 210, pins 220 and terminal posts 230. The terminal post 230 penetrates through the cover body 210. The pin 220 includes a connecting portion 221 and a leading-out portion 222. The connecting portion 221 and the leading-out portion 222 are connected to each other. The connecting portion 221 is connected to the terminal post 230. The cover body 210 is buckled on the housing 100. The pin 220 is accommodated inside the housing 100. The electric core 300 is accommodated inside the housing 100. The electric core 300 includes a body 310 and tabs 320. The tab 320 is connected to the leading-out portion 222. The potting adhesive 400 covers the tab 320 and the leading-out portion 222.

[0037] For example, as Figures 1 to 4As shown, the single cell includes a housing 100, a top cover 200, an electrode core 300, and potting glue 400. The top cover 200 includes a cover body 210, pins 220, and pole columns 230. The pole columns 230 penetrate through the cover body 210. The pins 220 include a connecting portion 221 and a leading-out portion 222. The connecting portion 221 and the leading-out portion 222 are connected to each other. The connecting portion 221 is welded to the pole column 230. The cover body 210 is buckled on the housing 100, and the pins 220 are accommodated inside the housing 100. The electrode core 300 is accommodated inside the housing 100. The electrode core 300 includes a main body 310 and electrode tabs 320. The electrode tabs 320 are welded to the leading-out portion 222. The potting glue 400 covers the electrode tabs 320 and the leading-out portion 222. The potting glue 400 covering the electrode tabs 320 and the leading-out portion 222 can play a certain fixing role and reduce the possibility of breakage between the electrode tabs 320 and the leading-out portion 222. And it can reduce or eliminate the gaps between the electrode tabs 320 and the housing 100 and between the leading-out portion 222 and the housing 100, enhance the restraint on the electrode tabs 320 and the leading-out portion 222, reduce the moving space of the electrode core 300 in the housing 100, and reduce the possibilities of problems such as deformation of the leading-out portion 222, interlayer misalignment of the electrode plates of the electrode core 300, cracking of the electrode tabs 320, and internal short circuit caused by contact with the housing 100, thereby improving the safety performance of the single cell.

[0038] It can be understood that the potting glue 400 should be made of an insulating material to prevent internal short circuit of the single cell. The potting glue 400 can be made of a material with better thermal conductivity to improve the heat dissipation efficiency at the electrode tabs 320 and reduce the temperature rise during the use of the single cell. The connecting portion 221 and the pole column 230, and the electrode tabs 320 and the leading-out portion 222 can be welded by laser or other means.

[0039] It should be noted that the potting glue 400 fills the gaps between the housing 100 and the electrode tabs 320 and between the housing 100 and the leading-out portion 222.

[0040] For example, as Figure 3As shown, the potting adhesive 400 is filled in the gaps between the housing 100 and the tab 320, and between the housing 100 and the lead-out portion 222, which can eliminate the movement space of the tab 320 and the lead-out portion 222, fix the tab 320 and the lead-out portion 222 relative to the housing 100, further enhance the constraint on the tab 320 and the lead-out portion 222, reduce the movement space of the battery cell 300 within the housing 100, and reduce the possibility of problems such as deformation of the lead-out portion 222, misalignment between the electrode sheets of the battery cell 300, cracking of the tab 320, and internal short circuit caused by contact with the housing 100, thereby improving the safety performance of the single battery. In addition, if a material with good thermal conductivity is used as the potting adhesive 400, the potting adhesive 400 filled in the gaps between the housing 100 and the tab 320, and between the housing 100 and the lead-out portion 222 can also play a role in improving the heat dissipation efficiency. The heat generated at the tab 320 can be conducted to the housing 100 relatively quickly and dissipated to the outside through the housing 100, reducing the temperature rise during the use of the single battery.

[0041] It should be noted that the housing 100 is provided with a glue injection hole 110, and the glue injection hole 110 is used to pour the potting adhesive 400 into the interior of the housing 100.

[0042] For example, as Figure 5 shown, the glue injection hole 110 is provided on the bottom surface of the housing 100, and the glue injection hole 110 is used to pour the potting adhesive 400 into the interior of the housing 100. During production, after the housing 100, the top cover 200, and the battery cell 300 are assembled, the potting adhesive 400 can be poured into the housing 100 through the glue injection hole 110. The operation is relatively simple and can improve production efficiency.

[0043] It can be understood that the glue injection hole 110 can also be provided on any side surface of the housing 100. There are no restrictions on the number, size, etc. of the glue injection hole 110, and it can be set according to actual needs.

[0044] It should be noted that the glue injection hole 110 is located at the corresponding position of the tab 320 or the lead-out portion 222.

[0045] For example, as Figure 2 shown, the glue injection hole 110 is located at the corresponding position of the tab 320 or the lead-out portion 222. After the potting adhesive 400 is injected through the glue injection hole 110, it can directly cover the tab 320 and the lead-out portion 222, which can improve the injection efficiency of the potting adhesive 400 and reduce material waste.

[0046] It should be noted that the single battery further includes a seal 500, and the seal 500 is connected to the housing 100 and covers the glue injection hole 110.

[0047] For example, as Figure 2 and Figure 3As shown, the single cell further includes a seal 500. The seal 500 is connected to the housing 100 and covers the glue injection hole 110, which can prevent the uncured potting glue 400 from flowing out of the glue injection hole 110 during the production process, and can improve the sealing performance of the housing 100, prevent dust, water vapor, etc. from entering the single cell through the glue injection hole 110, and ensure the safety performance of the single cell.

[0048] It can be understood that the seal 500 can be made of metal materials, or can be made of materials such as rubber and silica gel.

[0049] It should be noted that the housing 100 is provided with a sealing groove 120, the glue injection hole 110 is opened at the bottom of the sealing groove 120, and the seal 500 is embedded in the sealing groove 120.

[0050] For example, as Figure 5 shown, the housing 100 is provided with a sealing groove 120, the glue injection hole 110 is opened at the bottom of the sealing groove 120. Referring to Figure 2 , the seal 500 is embedded in the sealing groove 120, which is convenient for the installation and positioning of the seal 500, and can improve the cleanliness of the housing 100. In addition, the seal 500 embedded in the sealing groove 120 is not easily detached due to external scraping, which can further ensure the sealing performance of the housing 100.

[0051] It can be understood that the shape, size, etc. of the sealing groove 120 should match the shape and size of the seal 500.

[0052] In some other embodiments, the cover 210 is provided with a glue injection hole 110, and the glue injection hole 110 is used to pour the potting glue 400 into the interior of the housing 100.

[0053] For example, as Figure 6 shown, the cover 210 is provided with a glue injection hole 110, and the glue injection hole 110 is used to pour the potting glue 400 into the interior of the housing 100. During production, after the housing 100, the top cover 200, and the battery cell 300 are assembled, the potting glue 400 can be poured into the housing 100 through the glue injection hole 110. The operation is relatively simple and can improve production efficiency.

[0054] It can be understood that the glue injection hole 110 can be set at the corresponding positions of the tab 320 and the lead-out part 222. After the glue injection hole 110 is injected, it can directly cover the tab 320 and the lead-out part 222, which can improve the pouring efficiency of the potting glue 400 and reduce material waste. The single cell may further include a seal 500, and the seal 500 is connected to the cover 210 and covers the glue injection hole 110; referring to Figure 6 , the cover 210 may be provided with a sealing groove 120, the glue injection hole 110 is opened at the bottom of the sealing groove 120, and the seal 500 is embedded in the sealing groove 120.

[0055] It should be noted that the single cell further includes a baffle 600. The baffle 600 is connected to the inner wall of the housing 100 and the end of the body 310 near the tab 320. The housing 100, the tab 320 and the baffle 600 define a potting cavity 700, and the potting adhesive 400 is filled in the potting cavity 700.

[0056] For example, as Figure 7 and Figure 8 shown, the single cell further includes a baffle 600. The baffle 600 is connected to the inner wall of the housing 100 and the end of the body 310 near the tab 320. Referring to Figure 9 , the housing 100, the tab 320 and the baffle 600 define a potting cavity 700, and the potting adhesive 400 is filled in the potting cavity 700. The baffle 600 can confine the potting adhesive 400 within the potting cavity 700. While ensuring that the potting adhesive 400 covers the tab 320 and the lead-out portion 222, it can prevent the potting adhesive 400 from overflowing between the body 310 and the inner wall of the housing 100, and can reduce the waste of the potting adhesive 400.

[0057] It can be understood that the baffle 600, the housing 100 and the body 310 can be set as three separate components, or the baffle 600 and the housing 100 can be integrally formed.

[0058] It should be noted that tabs 320 are provided on both sides of the body 310, two pins 220 are provided, and the lead-out portions 222 are bent away from the cover 210 relative to the connection portions 221. One of the lead-out portions 222 is welded to the tab 320 on one side of the body 310, and the other lead-out portion 222 is welded to the tab 320 on the other side of the body 310.

[0059] For example, as Figures 1 to 4 shown, tabs 320 are provided on both sides of the body 310, two pins 220 are provided, and the lead-out portions 222 are bent away from the cover 210 relative to the connection portions 221. One of the lead-out portions 222 is welded to the tab 320 on one side of the body 310, and the other lead-out portion 222 is welded to the tab 320 on the other side of the body 310, and the structural layout is relatively reasonable. During installation, the two lead-out portions 222 are respectively aligned with the tabs 320 on both sides of the body 310 and welded. The welding space is large, the operation is relatively convenient, and the production efficiency can be improved.

[0060] It can be understood that when the tabs 320 are provided on both sides of the body 310, a plurality of injection holes 110 should be provided on the housing 100 or the cover 210, and the plurality of injection holes 110 are respectively provided at the corresponding positions of the tabs 320 on both sides of the body 310 or the two lead-out portions 222.

[0061] Next, referring to Figures 1 to 5Illustrate the single cell provided by the first aspect of the present application with a complete embodiment. It should be understood that the following solutions are only examples and do not constitute a limitation to the present application.

[0062] The single cell includes a housing 100, a top cover 200, an electric core 300, potting glue 400 and two seals 500.

[0063] The top cover 200 includes a cover body 210, two pins 220 and two terminal posts 230. Both terminal posts 230 penetrate through the cover body 210. The pin 220 includes a connecting portion 221 and a leading-out portion 222. The connecting portion 221 and the leading-out portion 222 are connected to each other. The two connecting portions 221 are welded to the two terminal posts 230 in a one-to-one correspondence. The cover body 210 is buckled on the housing 100, and the pins 220 are accommodated inside the housing 100.

[0064] The electric core 300 is accommodated inside the housing 100. The electric core 300 includes a body 310 and two tab ears 320. The two tab ears 320 are respectively connected to both sides of the body 310, and the tab ears 320 are welded to the leading-out portions 222.

[0065] Two sealing grooves 120 are formed at the bottom of the housing 100. A glue injection hole 110 is formed at the bottom of each sealing groove 120. One of the glue injection holes 110 corresponds to the position of the tab ear 320 on one side of the body 310, and the other glue injection hole 110 corresponds to the position of the tab ear 320 on the other side of the body 310.

[0066] The potting glue 400 fills the gaps between the housing 100 and the tab ears 320, and between the housing 100 and the leading-out portions 222.

[0067] Both of the two seals 500 are connected to the housing 100 and are respectively embedded inside the two sealing grooves 120 in a one-to-one correspondence.

[0068] The production process is as follows. After the housing 100, the top cover 200 and the electric core 300 are assembled, the potting glue 400 is injected into the housing 100 through the two glue injection holes 110, so that the potting glue 400 fills the gaps between the housing 100 and the tab ears 320, and between the housing 100 and the leading-out portions 222. Then, the seals 500 are installed in the sealing grooves 120. After the potting glue 400 is completely cured, it can play a certain role in fixing the tab ears 320 and the leading-out portions 222, reducing the possibility of breakage between the tab ears 320 and the leading-out portions 222; and it can reduce or eliminate the gaps between the tab ears 320 and the housing 100, and between the leading-out portions 222 and the housing 100, enhancing the constraint on the tab ears 320 and the leading-out portions 222, reducing the moving space of the electric core 300 inside the housing 100, and reducing the possibility of problems such as deformation of the leading-out portions 222, interlayer misalignment of the electrode sheets of the electric core 300, cracking of the tab ears 320, and internal short circuit caused by contact with the housing 100, thereby improving the safety performance of the single cell.

[0069] The battery module provided by the second aspect embodiment of the present application includes a busbar and the single cell provided by any embodiment of the first aspect of the present application. There are multiple single cells, and the multiple single cells are stacked in sequence; there are multiple busbars, and the multiple busbars are connected to the pole 230 to electrically connect the multiple single cells.

[0070] Using a single cell that can improve the stability between the pin and the battery core and has a relatively high safety performance can improve the safety performance of the battery module.

[0071] The battery pack provided by the third aspect embodiment of the present application includes a box body and the battery module provided by any embodiment of the second aspect of the present application, and the battery module is accommodated inside the box body.

[0072] Using a battery module with relatively high safety performance can improve the safety performance of the battery pack.

[0073] The embodiments of the present application have been described in detail above in conjunction with the accompanying drawings. However, the present application is not limited to the above embodiments. Various changes can be made without departing from the purpose of the present application within the knowledge scope of those of ordinary skill in the art. In addition, the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

Claims

1. A single cell, characterized in that, Comprising: A housing; A top cover, including a cover body, pins and a terminal post, the terminal post passing through the cover body, the pins including a connecting portion and a leading portion, the connecting portion being connected to the leading portion, the connecting portion being connected to the terminal post, the cover body being fastened to the housing, and the pins being received inside the housing; An electric core, received inside the housing, the electric core including a body and an electrode tab, the electrode tab being connected to the leading portion; Potting glue, covering the electrode tab and the leading portion, the housing further having a glue injection hole for injecting the potting glue into the inside of the housing, the glue injection hole being located at a position corresponding to the electrode tab or the leading portion; A baffle, connected to the inner wall of the housing and the end of the body near the electrode tab, the housing, the electrode tab and the baffle defining a potting cavity, and the potting glue being filled in the potting cavity.

2. The single cell according to claim 1, characterized in that The potting glue fills the gaps between the housing and the electrode tab and between the housing and the leading portion.

3. The single cell according to claim 1, characterized in that, It further includes a seal, the seal being connected to the housing and covering the glue injection hole.

4. The single cell according to claim 3, characterized in that, The housing has a sealing groove, the glue injection hole is opened at the bottom of the sealing groove, and the seal is embedded in the sealing groove.

5. The single cell according to claim 1, characterized in that, The cover body has a glue injection hole for injecting the potting glue into the inside of the housing.

6. Battery module, characterized in that, Comprising: The single cell according to any one of claims 1 to 5, a plurality of the single cells being stacked in sequence; Busbars, a plurality of the busbars being connected to the terminal posts to electrically connect the plurality of single cells.

7. Battery pack, characterized in that, Comprising: A box body; The battery module according to claim 6, the battery module being received inside the box body.

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