Battery and electric equipment

Abstract

The utility model discloses a battery and electric equipment. A shell of the battery comprises first side plates which are oppositely arranged in an X direction and second side plates which are oppositely arranged in a Y direction. Wherein the shell is internally provided with two or more battery cell groups which are arranged side by side in the Y direction, and each battery cell group is internally provided with a plurality of battery cell units which are arranged side by side in the X direction; a first heat dissipation gap is formed between every two adjacent battery cell groups, and a second heat dissipation gap is formed between every two adjacent battery cell units; a plurality of grooves are formed in the inner wall of the second side plate side by side in the X direction, the side sealing edge of each battery cell unit is located in one groove, and the top end R angle of the side sealing edge of each battery cell unit extends out of the top end opening of the groove. Therefore, in the battery, the plurality of battery cells can be positioned and subjected to heat conduction in a manner of forming the grooves in the inner walls of the side plates; and heat concentration at the position can be avoided by exposing the R angle at the top end of the side sealing edge of the battery cell unit. And the purpose of improving the safety performance of the battery is finally achieved.

Description

Technical Field

[0001] This application relates to the field of new energy technology, and in particular to a battery and an electrical device for incorporating the battery. Background Technology

[0002] Battery heat dissipation has always been a major concern in the industry, especially in high-power products where there are significant heat dissipation requirements and high demands on heat dissipation efficiency. A well-designed heat dissipation structure can not only improve battery performance and lifespan but also ensure its safe operation. Utility Model Content

[0003] In view of this, the purpose of this application is to provide a battery and an electrical device incorporating the battery, which can position and conduct heat to multiple battery cells by providing grooves on the inner wall of the side plate, thereby improving the safety performance of the battery.

[0004] To achieve the above objectives, this application provides the following technical solution:

[0005] A battery includes a casing, the casing comprising a first side plate arranged opposite each other in an X direction and a second side plate arranged opposite each other in a Y direction, the Y direction being perpendicular to the X direction. The casing contains two or more cell groups arranged side-by-side in the Y direction, each cell group containing multiple cell units arranged side-by-side along the X direction; a first heat dissipation gap is provided between adjacent cell groups, and a second heat dissipation gap is provided between adjacent cell units; the inner wall of the second side plate has multiple Z-direction protrusions arranged side-by-side along the X direction, adjacent Z-direction protrusions forming a groove, each cell unit's side sealing edge being located within one of the grooves, and the top R-angle of each cell unit's side sealing edge extending beyond the top opening of the groove.

[0006] Optionally, in the battery described above, the distance h between the top R-angle of the side seal and the top opening of the groove in the Z direction parallel to the XY plane is any value within the range of 5mm to 10mm.

[0007] Optionally, in the battery described above, the top R-angle of the side seal edge is bonded to the inner wall of the second side plate by a thermally conductive structural adhesive.

[0008] Optionally, in the above-mentioned battery, the cross-section of the groove is arc-shaped or zigzag-shaped, and its inner wall is bonded to the side sealing edge of the cell unit by thermally conductive structural adhesive.

[0009] Optionally, in the battery described above, a first foam is provided between adjacent battery cells, wherein the projection of the first foam in the X direction is located inside the side of the battery cell and maintains a greater than zero distance from the side edge of the battery cell.

[0010] Optionally, in the battery described above, in the Z direction parallel to the XY plane, the two ends of the first foam and the two ends of the core of the cell unit have a distance greater than zero.

[0011] Optionally, in the battery described above, the first foam and the second side plate have a spacing distance greater than zero in the Y direction.

[0012] Optionally, in the battery described above, two or more of the first foams are spaced apart between adjacent cell units in the Z direction, which is parallel to the XY plane.

[0013] Optionally, in the above-described battery, a second foam is provided at the bottom of each of the battery cells. Wherein: in the X direction, there is a greater than zero gap between adjacent second foams; and / or, in the Y direction, there is a greater than zero gap between the two ends of the second foam and the two ends of the core of the battery cell.

[0014] Optionally, the battery further includes a circuit board; at least some tabs of the cell unit and at least some tabs of the adjacent cell unit are welded to form a conductive connection; the circuit board is located on top of the cell assembly and is provided with a clearance notch that exposes the conductive connection.

[0015] Optionally, in the above-described battery, in each of the cell groups, one tab of the outermost cell unit is conductively connected to the busbar.

[0016] An electrical device is equipped with the battery described above.

[0017] As can be seen from the above technical solution, in the battery and electrical equipment provided by this application, the groove provided on the inner wall of the second side plate can limit and conduct heat to each cell unit, so that each cell unit can be kept and fixed in the battery casing without shaking or shifting. This helps to ensure that a reserved gap is maintained between adjacent cell units (including the second heat dissipation gap mentioned above). This reserved gap allows for uniform heat dissipation around each cell unit, avoiding the risk of high temperature caused by heat accumulation in individual cells or certain areas. In addition, since the R-corner area at the top of the side seal edge of each cell unit is located outside the groove on the inner wall of the second side plate, that is, the top of the Z-direction convex ridge on the inner wall of the second side plate is lower than the R-corner at the top of the side seal edge of the cell unit, the problem of the Z-direction convex ridge being too high on the inner wall of the second side plate affecting the assembly of the battery top cover can be avoided. Furthermore, the R-corner at the top of the side seal of each cell unit is located in the second heat dissipation gap mentioned above, and is in contact with the air in the second heat dissipation gap. This allows the air in the internal cavity of the battery (i.e., the cavity inside the battery that is not occupied by cell units or other components, and the second heat dissipation gap is part of this cavity) and the second side plate to dissipate heat simultaneously in the R-corner area at the top of the side seal. This helps to ensure the heat dissipation efficiency of the area where the R-corner at the top of the side seal is located, avoids the risk of high temperature caused by heat concentration in this area, and ultimately achieves the purpose of improving battery safety performance and lifespan and ensuring its safe operation. Attached Figure Description

[0018] 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.

[0019] Figure 1 This is an exploded structural diagram of the battery cell and casing in an embodiment of this application.

[0020] Figure 2 for Figure 1 A magnified view of the Q region.

[0021] Figure 3 for Figure 1 A schematic diagram of the assembly structure of the battery cell and casing.

[0022] Figure 4 for Figure 3 A magnified view of the T-region.

[0023] Figure 5 for Figure 3 A magnified view of the W region.

[0024] Figure 6 for Figure 3 Top view.

[0025] Figure 7 This is a schematic diagram of a structure provided in this application embodiment, in which a first foam is sandwiched between multiple battery cell units and a second foam is provided at the bottom of the battery cell unit.

[0026] in:

[0027] 1-First side plate, 2-Second side plate, 3-Bottom plate, 4-Battery cell unit

[0028] 5-Circuit board, 6-Conductive connection, 7-Heat sink,

[0029] 8 - First foam, 9 - Second foam

[0030] 21-groove, 40-cell assembly, 41-core, 42-tab, 50-avoidance notch

[0031] 411 - Side edge sealing top R angle, 210 - Top opening. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] Please see Figure 1 This application provides a battery whose casing includes a first side plate 1 arranged opposite to each other in the X direction and a second side plate 2 arranged opposite to each other in the Y direction, the Y direction being perpendicular to the X direction. It should be noted that the first side plate 1 is the large surface of the battery, the second side plate 2 is the side surface of the battery, the X direction as used in this application is the direction perpendicular to the large surface of the battery, the Y direction is the direction perpendicular to the side surface of the battery, and the Z direction is the vertical direction from the top to the bottom of the battery. These X, Y, and Z directions are perpendicular to each other.

[0034] Furthermore, the battery casing contains two or more cell groups 40 arranged side-by-side in the Y direction, and each cell group 40 contains multiple cell units 4 arranged side-by-side in the X direction. A first heat dissipation gap (i.e., ...) is provided between adjacent cell groups 40. Figure 1 and Figure 3 The cavity where the heat sink 7 is located (as shown in the diagram) has a second heat dissipation gap between adjacent battery cell units 4 (i.e., Figure 7 The Y-direction heat dissipation channel L1 shown in the diagram. Furthermore, as... Figure 6As shown, the inner wall of the second side plate 2 is provided with multiple Z-direction protrusions arranged side by side along the X direction, and the adjacent Z-direction protrusions form a groove 21. The side sealing edge of each battery cell 4 is located in a groove 21 and is fixedly connected to the second side plate 2 by thermally conductive adhesive. The top R angle 411 of the side sealing edge of each battery cell 4 is located outside the top opening 210 of the groove 21.

[0035] It should be noted that the "side seal top R-angle" mentioned in this application refers to a smooth transition area with a certain radius designed at the junction of the side and top edges of the battery cell during the battery packaging process. This design not only affects the appearance of the battery but also has a significant impact on the battery's functionality and safety in multiple aspects. For example, compared to sharp right angles, the R-angle structure can disperse stress, reduce stress concentration, and prevent material damage or crack propagation when subjected to external impacts or pressure. Moreover, the smooth R-angle structure can help achieve better sealing, prevent electrolyte leakage, and reduce the risk of scratching other components or people at the corners of the battery cell during assembly. Furthermore, it should be noted that the "top opening 210 of the groove 21" mentioned in this application refers to the inner wall of the second side plate 2 along the vertical direction (i.e., Figure 1 In the multiple grooves 21 arranged side by side in the Z direction shown, each groove 21 is a vertical through groove with a U-shaped (or isosceles trapezoidal) opening at its top. Therefore, the statement in this application that "the R-angle 411 of the side sealing edge of the battery cell 4 is located outside the top opening 210 of the groove 21" means that the side sealing edge of the battery cell 4 is located inside the groove 21, but the top of the side sealing edge extends outside the top opening 210 of the groove 21. For details, please refer to [link to relevant documentation]. Figures 3 to 5 The side sealing edge of the battery cell unit 4 extends beyond the top opening 210 of the groove 21, and its extension distance h is greater than zero. That is, the distance h between the top R angle 411 of the side sealing edge of the battery cell unit 4 and the top opening 210 of the groove 21 is greater than zero. In specific implementation, h can be any value in the range of 5mm to 10mm.

[0036] The grooves 21 described above can limit and conduct heat to each cell unit 4, ensuring that each cell unit 4 is kept fixed inside the battery casing without shaking or shifting. This helps to maintain a reserved gap between adjacent cell units 4 (including the second heat dissipation gap mentioned above, see details). Figure 7 The Y-direction heat dissipation channel L1 shown in the diagram allows for uniform heat dissipation around each battery cell 4 through the reserved gap, preventing heat accumulation in individual cells or specific areas that could lead to high temperatures. Furthermore, since the area where the R-angle 411 at the top of the side sealing edge of each battery cell 4 is located outside the groove 21 on the inner wall of the second side plate 2, that is, the top of the Z-direction convex ridge on the inner wall of the second side plate 2 is positioned lower than the R-angle 411 at the top of the side sealing edge of the battery cell 4 (i.e.,... Figures 3 to 5(where h is greater than zero), thus avoiding the problem of the Z-direction convex edge on the inner wall of the second side plate 2 being too high and affecting the fit of the battery top cover. Moreover, the R-angle 411 at the top of the side sealing edge of each cell unit 4 is located in the second heat dissipation gap mentioned above (see details). Figure 7 In the Y-direction heat dissipation channel L1 shown, it comes into contact with the air in the second heat dissipation gap, so that the air in the internal cavity of the battery (i.e. the cavity inside the battery that is not occupied by components such as the cell unit 4, and the second heat dissipation gap is a part of the cavity) and the second side plate 2 can dissipate heat at the top R corner 411 of the side sealing edge at the same time. This helps to ensure the heat dissipation efficiency of the area where the top R corner of the side sealing edge is located, avoids the risk of high temperature caused by heat concentration in this area, and ultimately achieves the purpose of improving the battery safety performance and life and ensuring its safe operation.

[0037] Please see Figure 2 and Figure 6 In some embodiments, the cross-section of the groove 21 is arc-shaped or zigzag-shaped. Specifically, the zigzag shape refers to a bent shape formed by connecting multiple line segments sequentially, similar to an arc. In specific implementation, the arc-shaped inner wall (or zigzag-shaped inner wall) of the groove 21 is adapted to the arc-shaped side sealing edge of the cell unit 4 and is bonded using thermally conductive structural adhesive. Furthermore, the top R-angle 411 of the side sealing edge mentioned above is also bonded to the inner wall of the second side plate 2 using thermally conductive structural adhesive. Thus, the second side plate 2 can position and conduct heat to multiple cell units 4. The thermally conductive structural adhesive not only transfers heat from the cell unit 4 to the second side plate 2 for heat dissipation and cooling, but also bonds the side sealing edge and its top R-angle of the cell unit 4, thereby improving the sealing strength at the side sealing edge and its top R-angle, avoiding risks such as glue separation or leakage at this location, and improving battery safety.

[0038] Please see Figure 7 In some embodiments, a first foam 8 is provided between adjacent battery cell units 4. Specifically, the projection of the first foam 8 in the X direction lies within the side surface of the battery cell unit 4, and the edge of this projection maintains a greater than zero gap distance from the side surface edge of the battery cell unit 4. Specifically, in the Z direction, parallel to the XY plane (i.e., the plane formed by the X and Y directions), both ends of the first foam 8 have a greater than zero gap distance from both ends of the core 41 of the battery cell unit 4. Specifically, the Z-direction length of the first foam 8 is less than the Z-direction length of the battery cell unit 4; moreover, in the Z direction, the top end of the first foam 8 has a greater than zero gap distance from the top sealing edge of the battery cell unit 4, and the bottom end of the first foam 8 has a greater than zero gap distance from the bottom end of the battery cell unit 4. This forms... Figure 7The Y-direction heat dissipation channel L1 is shown. Similarly, in the Y direction, there is a greater than zero gap between the first foam 8 and the second side plate 2; moreover, in the Y direction, the Y-direction length of the first foam 8 is less than the Y-direction length of the battery cell 4, and there is a greater than zero gap between the two sides of the first foam 8 and the two sides of the core 41 of the battery cell 4. This forms... Figure 6 The Z-direction heat dissipation channel L2 shown in the figure. Thus, the first foam 8 enables adjacent battery cell units 4 to form a heat dissipation channel that is not blocked by the foam, at least in the side edge region of the core body 41. This allows heat from the side peripheral edge of the battery cell unit 4 to be transferred through the heat dissipation channel, thereby improving the heat dissipation efficiency of each battery cell unit and avoiding the risk of high temperature caused by local heat concentration in the battery cell.

[0039] In some embodiments, to meet the requirements of battery weight reduction, the volume of the first foam 8 is as small as possible, so two or more first foams 8 can be spaced apart between adjacent cell units 4. For example, see [link to relevant documentation]. Figure 7 In the Z direction, parallel to the XY plane, two first foam units 4 are spaced apart. One first foam unit 8 is close to the top sealing edge of the battery cell 4 and maintains a preset distance greater than zero from the top sealing edge, while the other first foam unit 8 is close to the bottom of the battery cell 4 and maintains a preset distance greater than zero from the bottom. Thus, a space is formed between the two first foam units 8. Figure 7 The intermediate heat dissipation channel L3 is shown in the figure. This intermediate heat dissipation channel L3 is connected to the Y-direction heat dissipation channel L1 through the Z-direction heat dissipation channel L2, thereby connecting the outer side and peripheral cavity of each cell unit 4, which is conducive to uniform heat dissipation inside the battery and avoids local heat concentration in the cell.

[0040] Please see Figure 7 In some embodiments, a second foam 9 is also provided at the bottom of each battery cell 4. In the X direction, adjacent second foams 9 have a greater than zero spacing distance; and / or, in the Y direction, the two ends of the second foam 9 and the two ends of the core 41 of the battery cell 4 each have a greater than zero spacing distance. That is, multiple second foams 9 are spaced apart and correspond one-to-one with the battery cell 4, thereby forming interconnected bottom heat dissipation channels around the bottom side seal of each battery cell 4, which is beneficial for uniform heat dissipation inside the battery and avoids localized heat concentration in the battery cell.

[0041] In practice, the dimensions of each first foam 8 and second foam 9 can be specifically designed according to actual needs. For example, please refer to [link / reference]. Figure 7In some embodiments, in the Z direction: the distance between the top of the first foam 8 and the top of the core 41 of the battery cell 4 is a, where a can be any value in the range of 10mm to 30mm, for example, a = 15mm or 16.8mm or 20mm or 22.2mm or 25mm, etc.; the height dimension of each first foam 8 is b, where b can be any value in the range of 10mm to 30mm, for example, b = 15mm or 16.8mm or 20mm or 22.2mm or 25mm, etc.; the distance between the bottom of the first foam 8 and the bottom of the core 41 of the battery cell 4 is d, where d can be any value in the range of 10mm to 30mm, for example, d = 15mm or 15.8mm or 20mm or 22.2mm or 25mm, etc. Furthermore, in the X direction, the thickness of the first foam 8 is f, which can be any value in the range of 2mm to 20mm, for example, f=5mm or 5.8mm or 7mm or 7.2mm or 7.5mm or 8.1mm or 9mm or 10mm, etc.; the spacing between adjacent second foams 9 is e, which can be any value in the range of 2mm to 20mm, for example, e=5mm or 5.8mm or 7mm or 7.2mm or 7.5mm or 8.1mm or 9mm or 10mm, etc.

[0042] In summary, in the battery provided in this application embodiment, each cell unit 4 is spaced apart by foam, thus providing a heat dissipation gap between adjacent cell units 4. This gap allows the surrounding space of each cell unit 4 to be connected and conduct heat, which is beneficial for uniform heat dissipation inside the battery. For example, when the temperature of a certain local area of ​​the cell is high, the heat generated at that location can be conducted through the air around the cell in a timely manner through the aforementioned heat dissipation gap, and the heat can be transferred to other gap locations for heat dissipation through the heat sink 7 or the battery casing. Although the top R-corner area of ​​the side seal edge of the core 41 of each cell unit 4 does not directly contact the second side plate 2, it is located in the aforementioned heat dissipation gap, thereby transferring heat to the relatively cooler surrounding areas and achieving good heat dissipation efficiency.

[0043] Please see Figure 1 , Figure 3 and Figure 6In the battery provided in this application embodiment, a circuit board 5 is also provided on the top of the cell assembly 40. Specifically, the circuit board 5 can be a PCB (Printed Circuit Board). At least some of the tabs 42 of the cell unit 4 and at least some of the tabs of adjacent cell units 4 form conductive connection portions 6 by lap welding, so that multiple cell units 4 in the cell assembly 40 are connected in series or parallel sequentially; moreover, in each cell assembly 40, one tab of the outermost cell unit 4 is conductively connected to the busbar, as detailed in the following example. Figure 2 Position A in the diagram. Furthermore, the circuit board 5 is provided with a clearance notch 50 that exposes the conductive connection portion 6. Each conductive connection portion 6 is connected to the circuit board 5 near the clearance notch 50 via a nickel strip. This clearance notch 50 reduces the coverage area and volume of the circuit board 5, avoids large-area tab supports, and makes the exhaust channel at the top of the cell more unobstructed, resulting in better heat dissipation efficiency.

[0044] This application also provides an electrical device equipped with the battery described above. In specific implementations, this electrical device can be an electric vehicle, a home appliance, a smart device, a drone, a charging device, etc. This application does not specifically limit the type of electrical device; it can be any device capable of using the battery.

[0045] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed.

[0046] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0047] 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. 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 battery comprising a casing, the casing including a first side plate (1) arranged opposite to each other in an X direction, and a second side plate (2) arranged opposite to each other in a Y direction, the Y direction being perpendicular to the X direction, characterized in that: The housing contains two or more battery cell groups (40) arranged side by side in the Y direction, and each battery cell group (40) contains multiple battery cell units (4) arranged side by side in the X direction; a first heat dissipation gap is provided between adjacent battery cell groups (40), and a second heat dissipation gap is provided between adjacent battery cell units (4); The inner wall of the second side plate (2) is provided with a plurality of Z-direction protrusions arranged side by side along the X direction, and the adjacent Z-direction protrusions form a groove (21). The side sealing edge of each battery cell (4) is located in one of the grooves (21), and the top R angle (411) of the side sealing edge of each battery cell (4) is located outside the top opening (210) of the groove (21).

2. The battery according to claim 1, characterized in that, In the Z direction, which is parallel to the XY plane, the distance h between the top R angle (411) of the side sealing edge and the top opening (210) of the groove (21) is any value within the range of 5mm to 10mm.

3. The battery according to claim 1, characterized in that, The top R-angle (411) of the side sealing edge is bonded to the inner wall of the second side plate (2) by thermally conductive structural adhesive.

4. The battery according to claim 1, characterized in that, The groove (21) has an arc-shaped or zigzag-shaped cross section, and its inner wall is bonded to the side sealing edge of the battery cell (4) by a thermally conductive structural adhesive.

5. The battery according to claim 1, characterized in that, A first foam (8) is provided between adjacent battery cell units (4), wherein: The projection of the first foam (8) in the X direction is located inside the side of the battery cell (4) and maintains a greater than zero gap distance with the side edge of the battery cell (4).

6. The battery according to claim 5, characterized in that, In the Z direction, which is parallel to the XY plane, the two ends of the first foam (8) and the two ends of the core (41) of the battery cell (4) have a gap distance greater than zero.

7. The battery according to claim 5, characterized in that, In the Y direction, there is a gap distance greater than zero between the first foam (8) and the second side plate (2).

8. The battery according to claim 5, characterized in that, In the Z direction, which is parallel to the XY plane, two or more of the first foams (8) are spaced apart between adjacent battery cells (4).

9. The battery according to claim 1, characterized in that, Each of the battery cells (4) has a second foam (9) at its bottom. In the X direction, there is a greater than zero gap between adjacent second foams (9); and / or, in the Y direction, there is a greater than zero gap between the two ends of the second foams (9) and the two ends of the core (41) of the battery cell unit (4).

10. The battery according to any one of claims 1 to 9, characterized in that, It also includes circuit boards (5); At least a portion of the tabs (42) of the battery cell (4) and at least a portion of the tabs of the adjacent battery cell (4) are welded to form a conductive connection (6). The circuit board (5) is located on top of the battery cell assembly (40) and has a clearance notch (50) that exposes the conductive connection portion (6).

11. The battery according to claim 10, characterized in that, In each of the cell groups (40), one tab of the outermost cell unit (4) is electrically connected to the busbar.

12. An electrical appliance, characterized in that, The battery is provided according to any one of claims 1 to 11.

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