A battery and battery pack

Abstract

This utility model discloses a battery and a battery pack. The battery includes a cell and a cover plate. The cell includes a body and a tab disposed on the side of the body. The cover plate and the tab are located on the same side of the body. The cover plate includes a terminal post and a retainer. The retainer has a through hole, and the terminal post is disposed in the through hole and welded to the tab. The battery also includes a first adhesive member disposed on the side of the tab away from the terminal post. In this case, the first adhesive member can prevent the tab from short-circuiting with other structures and increase the insulation performance of the battery. The tab includes multiple stacked sheet-like structures. The first adhesive member is bonded to the retainer and the outermost sheet-like structure respectively. In this case, the first adhesive member can increase the adhesive force on the outermost sheet-like structure and increase the closing effect of each sheet-like structure in the tab, thereby improving the performance of the battery.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more particularly to a battery and battery pack. Background Technology

[0002] A battery typically consists of a cell and two cover plates. The positive tab of the cell is welded to the positive terminal of one of the cover plates, and the negative tab of the cell is welded to the negative terminal of the other cover plate. In a prismatic battery, the cell typically has two large faces, two side faces, and two end faces. When the positive and negative tabs of the cell are located on the two side faces respectively, the two cover plates are also located on the two side faces respectively. The cover plate with the positive terminal is located on the same side as the positive tab, and the cover plate with the negative terminal is located on the same side as the negative terminal.

[0003] Whether it's a positive or negative tab, there is usually a soldering area where the corresponding tab can be soldered to the terminal. There is usually an insulating coating on the soldering area to prevent the positive or negative tab from short-circuiting with other structures and to increase the insulation performance of the battery.

[0004] Furthermore, both the positive and negative tabs consist of multiple stacked sheet structures. Each sheet structure is welded to the corresponding terminal after being folded together. However, the insulating coating has limited effect on folding together the sheet structures, which can easily cause the outermost sheet structure to loosen, thus leading to a decrease in battery performance. Utility Model Content

[0005] This utility model provides a battery and battery pack to increase the convergence effect of the sheet-like structures in the tabs, thereby improving the battery performance.

[0006] In a first aspect, the present invention provides a battery, including a battery cell and a cover plate. The battery cell includes a body and a tab disposed on the side of the body. The cover plate and the tab are located on the same side of the body. The cover plate includes a post and a retainer. The retainer has a through hole, and the post is disposed in the through hole and welded to the tab.

[0007] The battery also includes a first adhesive element, which is located on the side of the tab away from the terminal post; the tab includes multiple stacked sheet structures, and the first adhesive element is respectively bonded to the retainer and the outermost sheet structure.

[0008] Secondly, this utility model provides a battery pack, including: a housing and a battery as described in the first aspect above, the battery being disposed within the housing.

[0009] The beneficial effects of this utility model are as follows:

[0010] The present invention provides a battery and battery pack in which the first adhesive member is disposed on the side of the tab away from the terminal post. When the first adhesive member is disposed on the side of the tab away from the terminal post, the first adhesive member can prevent the tab from short-circuiting with other structures and increase the insulation performance of the battery. When the first adhesive member is bonded to the cage and the outermost sheet structure respectively, the first adhesive member can increase the bonding force on the outermost sheet structure and increase the closing effect of each sheet structure in the tab, thereby improving the performance of the battery. Attached Figure Description

[0011] Figure 1 This is a three-dimensional structural diagram of a battery provided in an embodiment of the present utility model;

[0012] Figure 2 for Figure 1 A partially enlarged schematic diagram of the end of the battery cell within the dashed box 1 in the diagram;

[0013] Figure 3 This is a partially enlarged schematic diagram of the electrode tab provided in an embodiment of this utility model;

[0014] Figure 4 This is a partially enlarged schematic diagram of the cover plate provided in an embodiment of this utility model;

[0015] Figure 5 for Figure 1 A partially enlarged schematic diagram of the inner cover plate of the dashed box 1 after it has been lifted from the side of the battery cell;

[0016] Figure 6 For along Figure 5 The cross-sectional view shown by the dashed line x1 in the figure;

[0017] Figure 7 for Figure 1 Another enlarged partial schematic diagram of the inner cover plate of the dashed box 1 after it has been lifted from the side of the battery cell;

[0018] Figure 8 For along Figure 7 The cross-sectional view shown by the dashed line x2 in the figure;

[0019] Figure 9 This is a schematic diagram of the battery pack provided in an embodiment of the present utility model.

[0020] Figure label:

[0021] 10-Cell, 11-Body, 12-Taper, 121-Sheet structure, 20-Cover plate, 21-Cover plate corresponding to the positive electrode, 22-Cover plate corresponding to the negative electrode, 20a-Second flat plate structure, 20b-Cage, 20b1-Support member, 20b2-First flat plate structure, 20c-Terminal post, 20d-Cavity, 20e-Through hole, 110-Box, 120-Battery, 31-First adhesive member, 32-Second adhesive member, b1-Side, b2-Large surface, b3-End face, b4-Inner wall of the cavity, b5-Surface of the support member facing the body, Q0-Soldering area. Detailed Implementation

[0022] The specific embodiments of a battery and battery pack provided by this utility model will be described in detail below with reference to the accompanying drawings. It should be noted that the described embodiments are only some embodiments of this utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0023] This utility model embodiment provides a battery, such as Figures 1 to 6 As shown, the battery may include: a battery cell 10 and a cover plate 20. The battery cell 10 includes: a body 11, and a cover plate 20 disposed on the side of the body 11 (e.g., Figure 1 and Figure 2 The electrode tab 12 (shown as side b1 in the figure) comprises multiple stacked sheet-like structures 121; the cover plate 20 and the electrode tab 12 are located on the same side of the body 11 (e.g., side b1 in the figure). Figure 1 and Figure 2 (as shown in b1); the cover plate 20 includes a pole post 20c and a retainer 20b, the retainer 20b having a through hole, due to the viewing angle, Figures 1 to 6 The through holes are not shown in the middle, but the position of the pole post 20c is the position of the through hole. The pole post 20c is located in the through hole and is welded to the tab 12. The battery may also include a first adhesive 31, which is located on the side of the tab 12 away from the pole post 20c. The first adhesive 31 is bonded to the retainer 20b and the outermost sheet structure 121 respectively.

[0024] Thus, when the first adhesive member 31 is located on the side of the tab 12 away from the terminal post 20c, the first adhesive member 31 can prevent the tab 12 from short-circuiting with other structures and increase the insulation performance of the battery; when the first adhesive member 31 is bonded to the retainer 20b and the outermost sheet structure 121 respectively, the first adhesive member 31 can increase the adhesive force on the outermost sheet structure 121, increase the closing effect of each sheet structure 121 in the tab 12, thereby improving the performance of the battery.

[0025] Optionally, the battery cell 10 can be a laminated battery cell, which includes multiple positive electrode plates (such as...). Figure 3 Electrodes marked with a "+", and multiple negative electrodes (such as...) Figure 3 The electrode plates (marked with -) and separators are arranged in a stacked manner. Each positive electrode plate and each negative electrode plate is inserted into the "Z"-shaped folded separator at intervals. In the stacked battery cell 10, the smallest surface area among the stacked layers is the end face b3 of the battery cell 10. Figure 3 In the main body 11, the surface parallel to the paper is the end face b3. The larger surface adjacent to the end face b3 of the battery cell 10 is the large surface b2 of the battery cell 10. The surfaces adjacent to the end face b3 and the large surface b2 of the battery cell 10 are the side surfaces b1 of the battery cell 10.

[0026] It should be understood that the number of positive and negative electrode plates included in cell 10 is not limited to... Figure 3 As shown, Figure 3 This is merely an example of one embodiment and does not represent the number of setups in a real-world scenario.

[0027] At this time, each positive electrode has a sheet-like structure 121 on the same side of the cell 10. These sheet-like structures 121 converge and retract to form a positive electrode tab. Correspondingly, the cover plate located on the same side as the positive electrode tab can be called the positive electrode corresponding cover plate 21. At this time, the cover plate has a positive electrode post to facilitate the connection between the positive electrode tab and the positive electrode post. Similarly, each negative electrode has a sheet-like structure 121 on the same side of the cell 10. These sheet-like structures 121 converge and retract to form a negative electrode tab. Correspondingly, the cover plate located on the same side as the negative electrode tab can be called the negative electrode corresponding cover plate 22. At this time, the cover plate has a negative electrode post to facilitate the connection between the negative electrode tab and the negative electrode post. The electrode tab 12 mentioned in this embodiment can be either a positive electrode tab or a negative electrode tab. Accordingly, the cover plate 20 mentioned in this embodiment is the cover plate 20 located on the same side as the electrode tab 12.

[0028] Optionally, the surface of the tab 12 away from the terminal post 20c has a solder area Q0, and the first adhesive 31 covers the solder area Q0. The solder area Q0 can be considered as the area of ​​the tab 12 used for welding with the terminal post 20c. Therefore, welding slag may appear in the solder area Q0 after welding. Since an insulating coating is usually provided in the solder area Q0 in the prior art, and the insulating coating has a weak covering effect on the welding slag, the welding slag may puncture the insulating coating, leading to a short circuit between the positive tab and the negative electrode in the body 11, or vice versa, which would cause a short circuit in the cell 10. In this embodiment of the invention, when the first adhesive 31 is used instead of the insulating coating, the first adhesive 31 has a larger thickness and harder than the insulating coating, thus improving the covering effect on the welding slag, thereby preventing a short circuit in the cell 10 and improving the reliability of the battery.

[0029] Furthermore, the greater the thickness d1 of the first adhesive 31, the better the coverage of welding slag. Therefore, the thickness d1 of the first adhesive 31 can be set to 30μm to 100μm, thereby improving the reliability of the battery.

[0030] Optionally, the retainer 20b has a cavity 20d, which provides space for accommodating the tab 12, allowing the tab 12 to be placed within the cavity 20d for convenient assembly of the cell 10 and the cover plate 20. During assembly, the tab 12 is bent and welded to the electrode post 20c. When there is a certain distance d2 between the end of the tab 12 furthest from the body 11 (referred to as the distal end of the tab 12) and the inner wall b4 of the cavity 20d, if the distance d2 is too small, the distal end of the tab 12 may accumulate and wrinkle within the cavity 20d after assembly, potentially affecting the assembly effect of the first adhesive component 31. If the distance d2 is too large, the solder area Q0 may become smaller, affecting the welding effect. Therefore, to avoid affecting the assembly of the first adhesive component 31 while achieving a better welding effect, the distance d2 between the end of the tab 12 furthest from the body 11 and the inner wall of the cavity 20d can be set to 0.5mm to 1mm.

[0031] The retainer 20b may include a first flat plate structure 20b2 and a support member 20b1. The support member 20b1 extends from the surface of the first flat plate structure 20b2 toward the body 11 to the body 11, so that the support member 20b1 and the first flat plate structure 20b2 form a cavity 20d, thereby facilitating the placement of the tab 12 in the cavity 20d.

[0032] Furthermore, if the arrangement direction of the cover plate 20 and the body 11 is considered as the first direction, such as... Figure 1 As shown in the x-direction, the through hole where the pole post 20c is located can penetrate the first flat plate structure 20b2 along the first direction. This facilitates the welding of the pole post 20c to the pole lug 12 when the lug 12 is located within the cavity 20d, improving assembly convenience. It should be understood that, in order to clearly see the internal structure of the cover plate 20, therefore... Figure 5 The image shows the cover 20 after it has been lifted from the side of the battery cell 10. However, in reality, the cover 20 is fastened to the side of the battery cell 10, as shown in the image. Figure 1 The state shown in the image.

[0033] At this time, due to the presence of welding slag on the surface of the soldering area Q0, the bonding effect between the first adhesive 31 and the tab 12 in the soldering area Q0 may not be good. When the first adhesive 31 can be bonded to the inner wall of the cavity 20d and the surface b5 of the support 20b1 facing the body 11, the bonding area between the first adhesive 31 and the retainer 20b can be increased, the bonding strength of the first adhesive 31 can be improved, and the first adhesive 31 can be prevented from falling off, thereby improving the reliability of the battery.

[0034] Furthermore, such as Figure 4 As shown, the support member 20b1 has through holes 20e extending along the first direction. The through holes 20e can be one, two, three or more, and multiple through holes 20e can be arranged in an array or according to other rules. These through holes 20e can be used to release heat and gas. When a large amount of heat and gas is generated inside the cell 10, it can be dispersed to the outside of the cell 10 through the through holes 20e to avoid thermal runaway of the cell 10, thereby improving the safety of battery use.

[0035] Optionally, such as Figure 7 and Figure 8 As shown, it should be understood that, in order to make it easier to see the internal structure of the cover plate 20, therefore... Figure 7 The image shows the cover 20 after it has been lifted from the side of the battery cell 10. However, in reality, the cover 20 is fastened to the side of the battery cell 10, as shown in the image. Figure 1 The state shown is illustrated. The battery may also include a second adhesive member 32, which is bonded to the body 11, the tab 12, and the first adhesive member 31. In this case, the second adhesive member 32 can gather the sheet-like structures 121 in the tab 12, preventing the sheet-like structures 121 from becoming loose or scattered, thereby improving the connection effect between the tab 12 and the terminal post 20c.

[0036] The first adhesive component 31 can be located on the side of the second adhesive component 32 away from the tab 12. That is, during assembly, the second adhesive component 32 can be used to gather the sheet structures 121 first, and then the first adhesive component 31 can be assembled, so that the first adhesive component 31 is bonded to the side of the second adhesive component 32 away from the tab 12, thereby allowing the gathered sheet structures 121 to be welded to the pole post 20c better.

[0037] Furthermore, when the surface of the tab 12 away from the pole post 20c has a solder area Q0, and there is a distance d3 between the second adhesive 32 and the solder area Q0, if the distance d3 is too small, it will damage the second adhesive 32 during welding. If the distance d3 is too large, the outermost sheet structure 121 may warp after bending due to the weakened shrinkage effect, thus affecting the welding effect. Therefore, the distance d3 between the second adhesive 32 and the solder area Q0 can be set to 1.5mm to 4mm, which can avoid damage to the second adhesive 32 and improve the welding effect.

[0038] Optionally, the cover plate 20 also includes a second flat plate structure 20a, one end of the pole post 20c is fixed to the surface of the second flat plate structure 20a, and the other end of the pole post 20c is used to connect to the tab 12. The second flat plate structure 20a is located on the side of the retainer 20b away from the body 11. In this way, the second flat plate structure 20a can fix the support member 20b1 and prevent the support member 20b1 from shifting. The support member 20b1 can support the second flat plate structure 20a and prevent the tab 12 from being squeezed, thereby improving the reliability of the battery.

[0039] It should be understood that, Figure 4 , Figure 5 and Figure 7 The structure of the cover plate 20 shown is merely an exemplary embodiment. In reality, the structure of the cover plate 20 can be any embodiment that satisfies the above description. In other words, any structure of the cover plate 20 that satisfies the above description falls within the protection scope of this utility model.

[0040] Optionally, the first adhesive component 31 and the second adhesive component 32 may be made of the same or different materials. The first adhesive component 31 may be made of a material with insulating and adhesive properties, such as, but not limited to, insulating tape. The second adhesive component 32 may be made of a material with insulating and adhesive properties, such as, but not limited to, insulating tape.

[0041] The cage 20b can be made of an insulating material with a certain degree of hardness, such as, but not limited to, polyester and polyurethane.

[0042] The material used to make the second plate structure 20a can be an insulating material with a certain degree of hardness, such as, but not limited to, polyester and polyurethane. The materials used to make the second plate structure 20a and the cage 20b can be the same or different.

[0043] Based on the same inventive concept, this utility model embodiment also provides a battery pack, such as... Figure 9As shown, the battery pack may include: a housing 110 and a battery 120 as described in any of the embodiments above, wherein the battery 120 is disposed within the housing 110.

[0044] The battery 110 can be configured in multiple ways, and each battery can be connected in series, parallel or a combination of series and parallel to meet the performance requirements of the battery pack.

[0045] Of course, in addition to the battery 110 and the housing 120, the battery pack may also include other structures for realizing the functions of the battery pack, such as, but not limited to, battery management devices. The specific configuration can be set according to actual needs, and no specific limitation is made here.

[0046] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A battery, characterized by, The device includes a battery cell and a cover plate. The battery cell includes a body and a tab disposed on the side of the body. The cover plate and the tab are located on the same side of the body. The cover plate includes a post and a retainer. The retainer has a through hole, and the post is disposed in the through hole and welded to the tab. The battery further includes a first adhesive member disposed on the side of the tab away from the terminal post; the tab includes a plurality of stacked sheet-like structures, and the first adhesive member is respectively bonded to the retainer and the outermost sheet-like structure.

2. The battery of claim 1, wherein, The tab has a solder area on the side away from the pole post, and the first adhesive covers the solder area.

3. The battery as described in claim 2, characterized in that, The thickness of the first adhesive component is 30μm to 100μm.

4. The battery as described in claim 1, characterized in that, The retainer has a cavity, and the electrode tab is disposed in the cavity. The distance between the end of the electrode tab away from the body and the inner wall of the cavity is 0.5 mm to 1 mm.

5. The battery as described in claim 1, characterized in that, The retainer includes a first plate structure and a support member, the support member extending from one side surface of the first plate structure toward the body to the body; the support member and the first plate structure form a cavity, and the electrode tab is disposed in the cavity; the through hole penetrates the first plate structure along a first direction, the first direction being the arrangement direction of the cover plate and the body; The first adhesive is bonded to the inner wall of the cavity and the surface of the support facing the body, respectively.

6. The battery as described in claim 5, characterized in that, The support member has a through hole extending along the first direction.

7. The battery according to any one of claims 1-6, characterized in that, The battery also includes a second adhesive component, which is bonded to the body, the tab, and the first adhesive component.

8. The battery as claimed in claim 7, characterized in that, The first adhesive is located on the side of the second adhesive away from the tab.

9. The battery as described in claim 7, characterized in that, The tab has a solder area on the side away from the pole post, and the distance between the second adhesive and the solder area is 1.5 mm to 4 mm.

10. A battery pack, characterized in that, include: The housing and the battery as described in any one of claims 1-9, wherein the battery is disposed within the housing.

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