Battery, battery module and electric device
By using a common sealing section of aluminum-plastic film to connect the packaging sections of multiple batteries in the battery module, the problem of excessive time spacing when batteries are placed side by side is solved, achieving efficient packaging and improved safety of the battery module.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- ZHEJIANG LIWINON ENERGY TECHNOLOGY CO LTD
- Filing Date
- 2024-12-30
- Publication Date
- 2026-07-02
AI Technical Summary
In existing technologies, when multiple batteries are placed side by side, the spacing between adjacent batteries is relatively large, which affects the energy density of the battery module.
The common sealing section of aluminum-plastic film connects the packaging sections of multiple batteries to form a common sealing edge, reducing the number of sealing steps, reducing battery width and spacing, and improving packaging efficiency and safety.
The reduced spacing between batteries improves the energy density and safety of the battery module, lowers production costs, and enhances the energy density and safety of the battery.
Smart Images
Figure CN2024143768_02072026_PF_FP_ABST
Abstract
Description
Batteries, battery modules and electrical equipment
[0001] Cross-references to related applications
[0002] This application is based on and claims priority to Chinese Patent Application No. 202423221749.7, filed on December 25, 2024, the entire contents of which are incorporated herein by reference. Technical Field
[0003] This application relates to the field of new energy technology, and in particular to a battery, battery module and electrical equipment. Background Technology
[0004] In pursuit of larger battery capacity, longer battery life, and faster charging speeds, mobile phones, tablets, and other 3C electronic devices have begun to use multiple batteries connected in series to increase voltage and power.
[0005] In related technologies, each battery is individually packaged and then placed side-by-side or stacked together. Batteries often employ a double-folding process to improve performance and enhance safety. When batteries are placed side-by-side, there are at least six folds between adjacent batteries, resulting in a larger gap between them and affecting the energy density of the battery module. Summary of the Invention
[0006] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a battery that can reduce the spacing between battery cells, which is beneficial for further reducing battery size or further increasing energy density.
[0007] This application also proposes a battery module having the aforementioned battery.
[0008] This application also proposes an electrical device having the above-mentioned battery module.
[0009] The battery according to the first aspect embodiment of this application includes an aluminum-plastic film and a plurality of battery cells:
[0010] The aluminum-plastic film includes a first packaging section, a second packaging section, and a common sealing section. The first packaging section defines a first receiving cavity, and the second packaging section defines a second receiving cavity. The first receiving cavity and the second receiving cavity respectively house the battery cell. The first packaging section and the second packaging section are connected through the common sealing section.
[0011] The first packaging section and the second packaging section are stacked, and the common sealing section is connected to the same end of the first packaging section and the second packaging section.
[0012] The battery according to the embodiments of this application has at least the following beneficial effects:
[0013] In related technologies, the width of a single battery is equal to the thickness of the two folded edges on the left side + the width of the battery body + the thickness of the two folded edges on the right side. However, in this application, because the first packaging section and the second packaging section share a common sealing edge, the width of a single battery is equal to the thickness of the two folded edges on the left side + the width of the battery body + the thickness of the single folded edge on the right side, thus reducing the width of a single battery. When multiple batteries are assembled into a battery module, the batteries are grouped in pairs, with batteries in the same group arranged side-by-side and their common sealing edges fitting together. Therefore, the spacing between batteries in the same group is equal to the thickness of two folded edges. Compared to the related technologies where the spacing between adjacent batteries is four folded edges, the battery in this application can significantly reduce the spacing between batteries, thereby facilitating further reduction in battery size or further improvement in energy density.
[0014] According to some embodiments of this application, the first receiving cavity is located on the side of the first packaging portion facing the second packaging portion, and the second receiving cavity is located on the side of the second packaging portion facing the first packaging portion.
[0015] According to some embodiments of this application, the aluminum-plastic film includes a first housing and a second housing. The first housing defines a first perforation and a second perforation. The second housing is connected to the first housing to close the first perforation to form the first receiving cavity and to close the second perforation to form the second receiving cavity.
[0016] According to some embodiments of this application, the dimension of the common sealing portion along the stacking direction is not less than the sum of the thicknesses of the first packaging portion and the second packaging portion.
[0017] According to some embodiments of this application, the dimension A of the common sealing portion along the stacking direction, the thickness H1 of the first packaging portion, and the thickness H2 of the second packaging portion have the following relationship: 1.5mm > A-H1-H2 > 0.2mm.
[0018] According to some embodiments of this application, the first packaging portion further includes a first sealing edge surrounding the first receiving cavity, and the second packaging portion further includes a second sealing edge surrounding the second receiving cavity, wherein the first sealing edge and the second sealing edge overlap to form the common sealing edge portion.
[0019] According to some embodiments of this application, the first accommodating cavity is located on the side of the first packaging portion facing the second packaging portion, and the second accommodating cavity is located on the side of the second packaging portion away from the first packaging portion;
[0020] Alternatively, the first receiving cavity is formed on the side of the first packaging portion opposite to the second packaging portion, and the second receiving cavity is formed on the side of the second packaging portion opposite to the first packaging portion.
[0021] According to some embodiments of this application, the two said cells are connected in series or in parallel.
[0022] According to some embodiments of this application, the common sealing portion includes a sealing section and a transition section. The two sides of the sealing section are respectively connected to the first packaging portion and the second packaging portion through the transition section. The aluminum-plastic film includes a first shell and a second shell stacked together. The first shell and the second shell at the sealing section are connected. The first shell and the second shell at the transition section define a liquid replenishment cavity. The first accommodating cavity and the second accommodating cavity are respectively connected to the liquid replenishment cavity on the corresponding side.
[0023] According to some embodiments of this application, the dimension A of the common sealing portion along the stacking direction and the dimension B of the sealing segment along the stacking direction have the following relationship: A > B, and B > 0.1 mm.
[0024] The battery module according to the second aspect of this application includes the battery described in any one of the above embodiments.
[0025] According to some embodiments of this application, the battery module includes at least two batteries, which are grouped in pairs, with the common sealing portions of the batteries in the same group facing each other.
[0026] According to some embodiments of this application, two cells in the same battery are connected in series, and two batteries in the same group are connected in series, wherein the positive and negative tabs of each cell are arranged in the same position;
[0027] Alternatively, two cells in the same battery may be connected in parallel, or two batteries in the same group may be connected in parallel, wherein the positive and negative tabs of the two cells in the same battery are arranged in opposite positions.
[0028] Alternatively, two cells in the same battery may be connected in parallel, or two batteries in the same group may be connected in series, wherein the positive and negative tabs of the two cells in the same battery are arranged in opposite positions.
[0029] According to some embodiments of this application, the common sealing portions of the batteries in the same group are interconnected;
[0030] Alternatively, the battery module may further include a frame, with each battery connected to the frame to define the relative positions of the batteries in the same group.
[0031] The electrical device according to the third aspect of this application includes the battery module described in any of the above embodiments.
[0032] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description
[0033] The present application will be further described below with reference to the accompanying drawings and embodiments, wherein:
[0034] Figure 1 is a schematic diagram of a structure in which multiple batteries are stacked in parallel in a related technology;
[0035] Figure 2 is a structural schematic diagram of the battery in the assembled state according to an embodiment of this application;
[0036] Figure 3 is a front view of the structure in Figure 2;
[0037] Figure 4 is a schematic diagram of the battery in the initial state according to an embodiment of this application;
[0038] Figure 5 is a cross-sectional view of the structure in Figure 4;
[0039] Figure 6 is an enlarged schematic diagram of region A in Figure 5;
[0040] Figure 7 is a schematic diagram of the structure of the battery module according to an embodiment of this application;
[0041] Figure 8 is a simplified schematic diagram of the battery module according to an embodiment of this application from another angle;
[0042] Figure 9 is a schematic diagram showing the connection between the common sealing portion and the first packaging portion in an embodiment of this application;
[0043] Figure 10 is a schematic diagram of the edge sealing according to an embodiment of this application;
[0044] Figure 11 is a schematic diagram of another edge sealing embodiment of this application;
[0045] Figure 12 is a circuit connection diagram of an embodiment of this application (Scheme 1);
[0046] Figure 13 is a circuit connection diagram of an embodiment of this application (Scheme 2);
[0047] Figure 14 is a circuit connection diagram of an embodiment of this application (Scheme 3).
[0048] Reference numerals: Battery 10; First battery 11; Second battery 12; Aluminum-plastic film 100; First housing 101; First perforation 1011; Second perforation 1012; Second housing 102; First packaging section 110; First receiving cavity 111; Second packaging section 120; Second receiving cavity 121; Common sealing edge section 130; Sealing section 131; Transition section 132; Liquid replenishment cavity 133; First corner seal 140; Second corner seal 150; Battery cell 200; First battery cell 210; Second battery cell 220; Third battery cell 230; Fourth battery cell 240. Detailed Implementation
[0049] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein 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 this application, and should not be construed as limiting this application.
[0050] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0051] In the description of this application, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.
[0052] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.
[0053] In the description of this application, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0054] In pursuit of larger battery capacity, longer battery life, and faster charging speeds, mobile phones, tablets, and other 3C electronic devices have begun to use multiple batteries connected in series to increase voltage and power.
[0055] In related technologies, as shown in Figure 1, each battery is individually packaged and then placed side-by-side or stacked together. Batteries often employ a double-folding process to improve battery performance and enhance safety. When batteries are placed side-by-side, there are at least six folds between adjacent batteries, resulting in a larger gap between them and affecting the energy density of the battery module.
[0056] To address the aforementioned problems, a first aspect of this application provides a battery 10, which includes an aluminum-plastic film 100 and a battery cell 200. Referring to Figures 1 to 6, the aluminum-plastic film 100 includes a first packaging section 110, a second packaging section 120, and a common sealing section 130. As shown in Figures 5 and 6, the first packaging section 110 defines a first receiving cavity 111, and the second packaging section 120 defines a second receiving cavity 121. Both the first and second receiving cavities 111 and 121 are relatively sealed and not interconnected. The first and second receiving cavities 111 and 121 respectively contain the battery cell 200 and an electrolyte for electrochemical reactions. The first packaging section 110 and the second packaging section 120 are connected by the common sealing section 130. As shown in Figures 2 and 3, the first packaging section 110 and the second packaging section 120 are stacked, and the common sealing section 130 is connected to the same end of the first and second packaging sections 110 and 120.
[0057] It should be noted that the battery 10 has an initial state before folding and an assembled state after folding. In the initial state, as shown in Figures 4 to 6, the aluminum-plastic film 100 extends horizontally, and the first packaging part 110 and the second packaging part 120 are arranged side by side and spaced apart along the length of the aluminum-plastic film 100. The first packaging part 110 and the second packaging part 120 are connected to a common sealing edge 130. The aluminum-plastic film 100 includes a first shell 101 and a second shell 102. Taking the embodiment shown in Figures 5 and 6 as an example, the first shell 101 is defined with a first perforation 1011 and a second perforation 1012. The second shell 102 is connected to the first shell 101 and covers the first perforation 1011 and the second perforation 1012, thereby closing the first perforation 1011 to form a first receiving cavity 111 and closing the second perforation 1012 to form a second receiving cavity 121. The first housing 101 and the second housing 102 are connected by encapsulation processes such as hot pressing, hot melting, and adhesive bonding. During encapsulation, the edges of the perforation need to be sealed around the perimeter to form a closed accommodating cavity. In the embodiment of this application, the right side sealing edge of the first perforation 1011 is formed on the common sealing edge portion 130, and the left side sealing edge of the second perforation 1012 is also formed on the common sealing edge portion 130.
[0058] It should be noted that the right edge sealing of the first punch 1011 and the left edge sealing of the second punch 1012 can be formed in one step, that is, the first receiving cavity 111 and the second receiving cavity 121 can be separated by one edge sealing; or, the right edge sealing of the first punch 1011 and the left edge sealing of the second punch 1012 can also be formed separately in two steps. For example, after the right edge sealing of the first punch 1011 is completed, the left edge sealing of the second punch 1012 is completed, and the right edge sealing of the first punch 1011 and the left edge sealing of the second punch 1012 are combined to form the common edge sealing part 130 of this application.
[0059] After the battery 10 is packaged, it forms the initial state shown in Figure 4. Then, it is bent and folded along the common sealing edge 130 so that the first packaging part 110 and the second packaging part 120 are stacked, thus forming the assembled state shown in Figure 2. In the assembled state, as shown in Figure 2, the battery 10 includes two cells 200 stacked together. The left sealing edges of the two cells 200 are folded by a double-folding process, and the right sides of the two cells 200 are sealed by the common sealing edge 130.
[0060] Based on the above, the two battery cells 200 of this application share a common sealing portion 130, which can reduce the number of sealing operations in the process and improve the packaging efficiency of the battery 10. It also reduces material loss due to cutting, folding, etc., and improves the utilization rate of the aluminum-plastic film 100. Furthermore, the common sealing portion 130 reduces the width of the battery 10, which is beneficial for improving the energy density of the battery 10.
[0061] As shown in Figure 1, in related technologies, the width of a single battery is equal to the thickness of the three-layer folded edge on the left + the width of the battery body + the thickness of the three-layer folded edge on the right. However, in this application, as shown in Figure 3, since the first packaging section 110 and the second packaging section 120 share a common sealing edge 130, the width of a single battery 10 is equal to the thickness of the three-layer folded edge on the left (the folded edge is not shown in the figure, but can be referred to Figure 8) + the width of the battery body + the thickness of the single-layer common sealing edge 130 on the right. It should be noted that the thickness of the single-layer folded edge is equal to the sum of the thicknesses of the first housing 101 and the second housing 102, and the thickness of the common sealing edge 130 is also equal to the sum of the thicknesses of the first housing 101 and the second housing 102. Therefore, the thickness of the common sealing edge 130 is equal to the thickness of the single-layer folded edge. Thus, compared to the battery width in related technologies, the width of the battery 10 in this application is significantly reduced.
[0062] When multiple batteries 10 are assembled into a battery module, the batteries 10 are grouped in pairs, as shown in Figure 8. The batteries 10 in the same group are arranged side by side and the common sealing edge 130 is attached. Thus, the spacing between the batteries 10 in the same group is the thickness of two layers of folded edge. Compared with the related technology where the spacing between adjacent batteries 10 is six layers of folded edge (as shown in Figure 1), the battery 10 of this application can greatly reduce the spacing between batteries 10, which is conducive to further reducing the volume of battery 10 or further increasing energy density.
[0063] It should be noted that in related technologies, the aluminum-plastic film 100 needs to be cut before edge sealing, and a double-folding process is used to fold the edge sealing. This is to protect the edge sealing section to avoid short circuits. The battery 10 of this application includes two cells 200. The aluminum-plastic film 100 does not need to be cut to seal the two cells 200 separately. The two cells 200 share a common edge sealing section 130. Therefore, there is no edge sealing section at the common edge sealing section 130, which can improve the safety of the battery 10.
[0064] For the sealing edge of a single cell 200, there are certain requirements for its sealing edge size. Taking the battery module that requires two cells 200 to be connected in series as an example, if the relevant technology uses a structure of two single-cell batteries connected in series, each battery needs at least two sealing edge widths + one cell width of aluminum-plastic film, and two batteries need at least four sealing edge widths + two cell widths of aluminum-plastic film.
[0065] For the battery 10 of this application, since it adopts a structure in which two cells 200 share a common sealing edge 130, it is possible to achieve the same charging speed and output power as two parallel batteries 10 in related technologies. Therefore, the production of the battery 10 of this application only requires an aluminum-plastic film 100 with a sealing edge width of three + two cell 200 widths, thereby reducing the production cost of the battery 10.
[0066] During the folding process of switching the battery 10 from its initial state to its assembled state, various folding schemes exist depending on the length of the common sealing edge portion 130. For example, in the embodiment shown in FIG3, the aluminum-plastic film 100 folds the sides of the first packaging portion 110 and the second packaging portion 120 that form the receiving cavity towards each other. That is, after the aluminum-plastic film 100 is folded, the first receiving cavity 111 is located on the side of the first packaging portion 110 facing the second packaging portion 120, and the second receiving cavity 121 is located on the side of the second packaging portion 120 facing the first packaging portion 110. Thus, the dimension of the common sealing edge portion 130 along the stacking direction is not less than the sum of the thicknesses of the first packaging portion 110 and the second packaging portion 120. It can be understood that the common sealing edge portion 130 can be arranged vertically along the stacking direction. Alternatively, the common sealing edge portion 130 can be arranged with a certain curvature along the stacking direction.
[0067] Furthermore, the dimension A of the common sealing portion 130 along the lamination direction, the thickness H1 of the first packaging portion 110, and the thickness H2 of the second packaging portion 120 have the following relationship: 1.5mm > A - H1 - H2 > 0.2mm. That is, the dimension of the common sealing portion 130 along the lamination direction is greater than the sum of the thicknesses of the first packaging portion 110 and the second packaging portion 120, thus allowing for some expansion space. However, the dimension of the common sealing portion 130 cannot be too large; excessive folding allowance will not only reduce energy density but also worsen safety performance such as drop resistance.
[0068] Therefore, the present application conducted the following drop test to verify the optimal size range of the common edge banding 130.
[0069] A fully charged battery (battery 10) was dropped freely from a height of 1 meter onto a concrete slab, once in each of the six directions (X, Y, Z, positive and negative). Voltage and internal resistance were measured before and after the test. Three batteries were tested in total. The passing criteria for the drop test were: the battery did not catch fire, explode, or smoke; the internal resistance change was less than 10mΩ; and the cell voltage change was less than 0.1V. The table below shows the drop test results:
[0070] Therefore, it can be seen that when the range of A-H1-H2 is within the range of 0.2mm to 1.5mm, the battery 10 can pass the drop test and has good safety performance.
[0071] It is understandable that the opposing walls of the first packaging section 110 and the second packaging section 120 can directly abut against each other, or a heat insulation pad or a support and cushioning pad can be provided between the first packaging section 110 and the second packaging section 120. While separating the first packaging section 110 and the second packaging section 120, they can also fix the first packaging section 110 and the second packaging section 120 to prevent relative shaking and displacement.
[0072] Furthermore, based on the aforementioned folded assembly state, as shown in Figures 4 and 5, the first punch 1011 and the second punch 1012 are both formed on the first housing 101, while the second housing 102 does not require punching.
[0073] It is understood that after the first housing 101 and the second housing 102 are packaged and connected, a first sealing edge is formed in the first packaging part 110 to surround the first receiving cavity 111, and a second sealing edge is formed in the second packaging part 120 to surround the second receiving cavity 121. The first sealing edge and the second sealing edge overlap to form a common sealing edge part 130.
[0074] In other embodiments (not shown in the figures), after the aluminum-plastic film 100 is folded, the first accommodating cavity 111 is located on the side of the first packaging portion 110 facing the second packaging portion 120, and the second accommodating cavity 121 is located on the side of the second packaging portion 120 away from the first packaging portion 110. Thus, the length of the common sealing portion 130 is not less than the thickness of the first packaging portion 110. A first perforation 1011 is formed on the first housing 101, and a second perforation 1012 is formed on the second housing 102. After the first housing 101 and the second housing 102 are connected, the first perforation 1011 and the second perforation 1012 are staggered and form the common sealing portion 130 between them.
[0075] In other embodiments, after the aluminum-plastic film 100 is folded, a first accommodating cavity 111 is formed on the side of the first packaging portion 110 opposite to the second packaging portion 120, and a second accommodating cavity 121 is formed on the side of the second packaging portion 120 opposite to the first packaging portion 110. This type of battery 10 is suitable for applications requiring shorter sealing edges. For example, a spacer is provided between the first packaging portion 110 and the second packaging portion 120, and the length of the common sealing edge portion 130 only needs to be no less than the thickness of the spacer.
[0076] It should be noted that, for cases where the common sealing portion 130 is large, as shown in Figure 3, it is not necessary to heat-seal all of the common sealing portion 130 in actual production. Specifically, in some embodiments, as shown in Figures 3 and 9, the common sealing portion 130 includes a sealing section 131 and a transition section 132. Transition sections 132 are respectively provided on both sides of the sealing section 131. It should be noted that the first housing 101 and the second housing 102 at the sealing section 131 are connected together by heat sealing or other connection methods. The first housing 101 and the second housing 102 at the transition section 132 are not heat-sealed, thus defining the liquid replenishment chamber 133 at the first housing 101 and the second housing 102 at the transition section 132. The two liquid replenishment chambers 133 separated by the sealing section 131 are respectively connected to the first receiving chamber 111 and the second receiving chamber 121.
[0077] It is understandable that, taking the connection between the replenishment chamber 133 and the first accommodating chamber 111 as an example, although in the embodiment shown in Figure 3, the common sealing portion 130 is respectively intersecting with the first packaging portion 110, and the shell at the connection between the common sealing portion 130 and the first packaging portion 110 is bent, which may block the flow of electrolyte between the first accommodating chamber 111 and the replenishment chamber 133, during the battery cell cycle, the electrolyte in the first accommodating chamber 111 is continuously consumed, and the thickness and width of the battery cell expand. At this time, the replenishment chamber 133 is subjected to expansion and compression, and the electrolyte in the replenishment chamber 133 can be squeezed into the first accommodating chamber 111 along with the expansion to replenish the electrolyte in the first accommodating chamber 111 and improve the cycle life.
[0078] Furthermore, the dimension A of the common sealing portion 130 along the stacking direction and the dimension B of the sealing section 131 along the stacking direction have the following relationship: A > B, and B > 0.1 mm, so as to ensure that the strength at the sealing section 131 can meet the requirements of the battery.
[0079] As shown in Figure 10, when the aluminum-plastic film 100 is not folded, the battery cell 200 in the accommodating cavity has a large amount of room to move due to the unclosed transition section 132 in the common sealing edge 130, which poses a risk of the battery cell 200 shifting position. Therefore, in some embodiments, the position of the battery cell 200 in the accommodating cavity is limited.
[0080] Specifically, the battery cell 200 includes a first end and a second end, the first end having a tab, and the second end not having a tab. The battery cell 200 includes four corner positions, with the first end and the second end each having two corner positions. Because the tab is sandwiched between the first housing 101 and the second housing 102 during the sealing process, the position of the first end of the battery cell within the receiving cavity is often fixed. However, there is a risk that the second end may shift towards the transition section 132 of the common sealing portion 130.
[0081] For ease of description, the corner located at the second end of the battery cell 200 and near the common sealing edge 130 is designated as the first corner. The first packaging section 110 is also provided with a first corner seal 140, which corresponds to the first corner of the battery cell 200 in the first packaging section 110. Similarly, the second packaging section 120 can also be provided with a first corner seal 140, which corresponds to the first corner of the battery cell 200 in the second packaging section 120. The first corner seal 140 can be an arc-shaped sealing edge as shown in Figure 10, or it can be a dotted sealing edge, a rectangular sealing edge, or a circular sealing edge, etc., located outside the transition section 132 and corresponding to the side of the battery cell 200.
[0082] The first corner seal 140 restricts the movement of the battery cell 200 towards the common sealing edge 130 in the first accommodating cavity 111 and / or the second accommodating cavity 121, thus avoiding the problem of positional displacement of the battery cell 200 and improving the yield of the battery cell 200. Furthermore, as shown in Figure 10, the arc-shaped corner seal can prevent stress concentration at the first corner of the battery cell 200, reducing the probability of damage to the aluminum-plastic film 100 at the first corner when the battery cell 200 expands.
[0083] Furthermore, as shown in Figure 11, the corner located at the first end of the battery cell 200 and near the common sealing edge 130 is designated as the second corner. The first packaging section 110 includes a second corner seal 150, which corresponds to the second corner of the battery cell 200 in the first packaging section 110. Similarly, the second packaging section 120 may also include a second corner seal 150, which corresponds to the second corner of the battery cell 200 in the second packaging section 120. It is understood that since the aluminum-plastic film 100 needs to be folded at the first and second corners to allow the first packaging section 110 and the second packaging section 120 to be stacked, the first and second corners of the two battery cells 200 are stress concentration points. By providing an additional corner seal, stress can be dispersed, reducing the probability of damage to the aluminum-plastic film 100.
[0084] Furthermore (not shown in the figure), corner seals are also provided for the other two corners of the battery cell 200. Specifically, the two corners furthest from the common sealing edge 130 are designated as third corners, and the first packaging section 110 includes third corner seals, which correspond to the third corner positions of the battery cell 200 in the first packaging section 110. Similarly, the second packaging section 120 may also include third corner seals, which correspond to the third corner positions of the battery cell 200 in the second packaging section 120. Thus, when the battery cell 200 is in the receiving cavity, all four corners are limited and protected by corner seals, improving the positional stability of the battery cell 200 in the receiving cavity and reducing the probability of damage to the aluminum-plastic film 100 at the corners of the battery cell 200.
[0085] In some embodiments, the dual cells 200 in the battery 10 can be connected in series or in parallel, depending on the specific application scenario.
[0086] A second aspect of this application provides a battery module that includes the battery 10 mentioned in the above embodiments.
[0087] Furthermore, as shown in Figure 8, the battery module includes at least two dual-cell batteries 10, which are arranged in pairs, with the common sealing edge 130 of the batteries 10 in the same group facing each other. This greatly reduces the spacing between the batteries 10 in the same group.
[0088] Furthermore, the two batteries 10 in the same group can be connected in series or in parallel. Considering the series and parallel connections of the two cells 200 within the same battery 10, there are three possible electrical connection schemes: It should be noted that, for ease of description, the battery 10 on the left in Figures 12 to 14 is named the first battery 11, and the battery 10 on the right is named the second battery 12. The upper cell 200 in the first battery 11 is named the first cell 210, and the lower cell 200 in the first battery 11 is named the second cell 220. The upper cell 200 in the second battery 12 is named the third cell 230, and the lower cell 200 in the second battery 12 is named the fourth cell 240.
[0089] Option 1: Two cells 200 in the same battery 10 are connected in series, and batteries 10 in the same group are connected in series;
[0090] As shown in Figure 12, the four cells 200 are connected in series. The two cells 200 in the same battery 10 are the same, and the cells 200 in different batteries 10 are also the same.
[0091] It should be noted that the similarities or differences mentioned here are all based on whether the positions of the tabs on the battery cell and the polarity of the tabs at the same positions are the same. Taking the first battery cell 210 and the second battery cell 220 as examples, referring to Figures 5 and 12, when the first battery cell 210 is placed in the first pit, its left tab should be the positive tab and its right tab should be the negative tab. When the second battery cell 220 is placed in the second pit, its left tab should be the positive tab and its right tab should be the negative tab, and their tab positions are the same. Therefore, it is determined that the first battery cell 210 and the second battery cell 220 are the same.
[0092] The tabs of the first battery cell 210 and the second battery cell 220 are positioned at the same location, and the polarity of the tabs at the same location is the same. Therefore, when the sides of the first packaging section 110 and the second packaging section 120 with the receiving cavity are folded towards each other, the tabs of the first battery cell 210 are both located above the tabs of the second battery cell 220, and the positive tab of the first battery cell 210 is positioned corresponding to the negative tab of the second battery cell 220, and the negative tab of the first battery cell 210 is positioned corresponding to the positive tab of the second battery cell 220.
[0093] The same applies to the third cell 230 and the fourth cell 240. Furthermore, the positive and negative tabs of the first cell 210, second cell 220, third cell 230, and fourth cell 240 are positioned in the same way. Thus, in the four-cell series connection scheme of Scheme 1, the circuit connection can be achieved using a shorter connecting wire.
[0094] Option 2: Two cells 200 in the same battery 10 are connected in parallel, and batteries 10 in the same group are connected in parallel; as shown in Figure 13, the first cell 210 and the second cell 220 are connected in parallel, the third cell 230 and the fourth cell 240 are connected in parallel, and the first battery 11 and the second battery 12 are connected in parallel.
[0095] In this configuration, the tabs of the first battery cell 210 and the second battery cell 220 are positioned in the same location, but the polarity of the tabs at the same location is opposite. That is, the positive and negative tabs of the first battery cell 210 and the second battery cell 220 are positioned oppositely. Similarly, the positive and negative tabs of the third battery cell 230 and the fourth battery cell 240 are positioned oppositely. Thus, the first battery cell 210 and the fourth battery cell 240 are identical, and the second battery cell 220 and the third battery cell 230 are identical. After folding, the structure shown in Figure 13 is formed, so that the positive tab of the first battery cell 210 is located above the positive tab of the second battery cell 220, and the connecting wire can directly connect the two positive tabs. The same applies to the negative tabs, so as to realize the parallel connection of the two battery cells 200.
[0096] Option 3: Two cells 200 in the same battery 10 are connected in parallel, and batteries 10 in the same group are connected in series; as shown in Figure 14, the first cell 210 and the second cell 220 are connected in parallel, the third cell 230 and the fourth cell 240 are connected in parallel, and the first battery 11 and the second battery 12 are connected in series.
[0097] In this scheme, the positive and negative tabs of the first cell 210 and the second cell 220 are positioned oppositely, as are the positive and negative tabs of the third cell 230 and the fourth cell 240. Therefore, the first cell 210 and the fourth cell 240 are identical, and the second cell 220 and the third cell 230 are identical. The cell distribution in this third scheme is the same as that in the second scheme, but the circuit connection method has changed.
[0098] Furthermore, it can be observed that in the battery module of this application, by adopting a stacked structure of dual cells 200 with a shared common sealing edge 130, the two batteries 10 in the same group can have good consistency. For example, as shown in Figures 12 to 14, the tab height of the first cell 210 is consistent with the tab height of the third cell 230, and the tab height of the second cell 220 is consistent with the tab height of the fourth cell 240. Therefore, when designing the protection board (a component connected to the battery 10, which plays the role of battery protection, monitoring and balancing charge, etc.), the height of the points on the protection board used for connecting with each tab can be relatively consistent, thereby reducing the design difficulty of the protection board and facilitating the wiring layout on the protection board.
[0099] In some embodiments, based on the foregoing, the common sealing portions of the two batteries 10 in the same group are arranged facing each other and connected to each other. The connection method can be adhesive bonding or other connection methods. This connects the two batteries 10 in the same group into a single structure. In other embodiments, the battery module also includes a frame, and the two batteries 10 in the same group are respectively connected to the frame. The connection method can be adhesive bonding of the top and bottom surfaces of the battery 10 to the frame, or fixing of a single battery 10 to the frame through snap-fit or other connection methods, thereby fixing the position of the two batteries 10 in the same group.
[0100] A third aspect of this application provides an electrical device that includes the battery module mentioned in the above embodiments. It is understood that the electrical device can be a mobile phone, computer, camera, or other 3C digital device; it can also be a power tool such as an electric drill or electric grinder; it can be a household appliance such as an electric vacuum cleaner or robot vacuum cleaner; or it can be a transportation vehicle such as a new energy vehicle. The battery module can also be applied to outdoor equipment, industrial equipment, and other fields. The list is exhaustive, and the applications that can be made by those skilled in the art shall prevail.
[0101] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application. Furthermore, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other.
Claims
1. Battery, including aluminum-plastic film and multiple battery cells: The aluminum-plastic film includes a first packaging section, a second packaging section, and a common sealing section. The first packaging section defines a first receiving cavity, and the second packaging section defines a second receiving cavity. The first receiving cavity and the second receiving cavity respectively house the battery cell. The first packaging section and the second packaging section are connected through the common sealing section. in, The first packaging section and the second packaging section are stacked, and the common sealing section is connected to the same end of the first packaging section and the second packaging section.
2. The battery according to claim 1, wherein, The first receiving cavity is located on the side of the first packaging section facing the second packaging section, and the second receiving cavity is located on the side of the second packaging section facing the first packaging section.
3. The battery according to claim 2, wherein, The aluminum-plastic film includes a first shell and a second shell. The first shell defines a first dent and a second dent. The second shell is connected to the first shell to close the first dent to form the first receiving cavity and to close the second dent to form the second receiving cavity.
4. The battery according to claim 2, wherein, The dimension of the common sealing portion along the stacking direction is not less than the sum of the thicknesses of the first packaging portion and the second packaging portion.
5. The battery according to claim 4, wherein, The dimension A of the common sealing portion along the stacking direction, the thickness H1 of the first packaging portion, and the thickness H2 of the second packaging portion have the following relationship: 1.5mm > A-H1-H2 > 0.2mm.
6. The battery according to claim 2, wherein, The first packaging section further includes a first sealing edge surrounding the first receiving cavity, and the second packaging section further includes a second sealing edge surrounding the second receiving cavity, wherein the first sealing edge and the second sealing edge overlap to form the common sealing edge section.
7. The battery according to claim 1, wherein, The first accommodating cavity is located on the side of the first packaging section facing the second packaging section, and the second accommodating cavity is located on the side of the second packaging section away from the first packaging section; Alternatively, the first receiving cavity is formed on the side of the first packaging portion opposite to the second packaging portion, and the second receiving cavity is formed on the side of the second packaging portion opposite to the first packaging portion.
8. The battery according to claim 1, wherein, The two cells are connected in series or in parallel.
9. The battery according to claim 1, wherein, The common sealing section includes a sealing section and a transition section. The two sides of the sealing section are respectively connected to the first packaging section and the second packaging section through the transition section. The aluminum-plastic film includes a first shell and a second shell stacked together. The first shell and the second shell at the sealing section are connected. The first shell and the second shell at the transition section define a liquid replenishment cavity. The first accommodating cavity and the second accommodating cavity are respectively connected to the liquid replenishment cavity on the corresponding side.
10. The battery according to claim 9, wherein, The dimension A of the common sealing portion along the stacking direction and the dimension B of the sealing section along the stacking direction have the following relationship: A > B, and B > 0.1 mm.
11. The battery according to claim 1, wherein, The battery cell includes a first end with a tab and a second end opposite to the first end, and the battery cell has four corner positions, with the corner position located at the second end of the battery cell and close to the common sealing edge being designated as the first corner position; Wherein, the first packaging section includes a first corner seal, the first corner seal being disposed at a first corner position corresponding to the battery cell in the first packaging section; and / or, the second packaging section includes a first corner seal, the first corner seal being disposed at a first corner position corresponding to the battery cell in the second packaging section.
12. The battery according to claim 11, wherein, The corner located at the first end of the battery cell and near the common sealing edge is designated as the second corner position. The first packaging part includes a second corner seal, and the second corner seal is provided corresponding to the second corner position of the battery cell in the first packaging part; and / or, the second packaging part includes a second corner seal, and the second corner seal is provided corresponding to the second corner position of the battery cell in the second packaging part.
13. The battery according to claim 12, wherein, The two corners away from the common sealing edge are designated as the third corners. The first packaging part includes a third corner seal, which corresponds to the third corner of the battery cell in the first packaging part; and / or, the second packaging part includes a third corner seal, which corresponds to the third corner of the battery cell in the second packaging part.
14. A battery module comprising the battery as claimed in any one of claims 1 to 13.
15. The battery module according to claim 14, wherein, The battery module includes at least two batteries, which are grouped in pairs, with the common sealing edges of the batteries in the same group facing each other.
16. The battery module according to claim 15, wherein, Two cells in the same battery are connected in series, and two batteries in the same group are connected in series, wherein the positive and negative tabs of each cell are positioned in the same way; Alternatively, two cells in the same battery may be connected in parallel, or two batteries in the same group may be connected in parallel, wherein the positive and negative tabs of the two cells in the same battery are arranged in opposite positions. Alternatively, two cells in the same battery may be connected in parallel, or two batteries in the same group may be connected in series, wherein the positive and negative tabs of the two cells in the same battery are arranged in opposite positions.
17. The battery module according to claim 15, wherein, The common sealing edges of the batteries in the same group are connected to each other; Alternatively, the battery module may further include a frame, with each battery connected to the frame to define the relative positions of the batteries in the same group.
18. Electrical equipment, including a battery module as claimed in any one of claims 14 to 17.