Battery and electric device

Abstract

The utility model discloses a battery and an electric device. The battery comprises a positive plate and a negative plate, the negative plate and the positive plate are stacked; the bipolar pole pieces are stacked between the positive pole piece and the negative pole piece, diaphragms are arranged between every two adjacent bipolar pole pieces, between every two adjacent bipolar pole pieces and the positive pole piece and between every two adjacent bipolar pole pieces and the negative pole piece, and a test tab protruding out of each bipolar pole piece is led out of each bipolar pole piece. One end of the battery along the first direction is a leading-out end, the plurality of test tabs are all located at the leading-out end, and the first direction is perpendicular to the stacking direction of the positive plate and the negative plate. According to the battery disclosed by the utility model, connection between the bipolar pole piece and the sampling terminals is facilitated, and the battery is convenient to be matched with detection equipment with a plurality of sampling terminals to quickly detect the state of each battery unit.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery and an electrical device. Background Technology

[0002] In related technologies, lithium-ion batteries are composed of several bipolar battery cells connected in parallel. Each bipolar battery cell includes a positive electrode unit, a negative electrode unit, and several stacked bipolar electrode units arranged in series. The number of stacked bipolar electrode units can be determined according to actual needs. In this way, on the one hand, the series connection of several stacked bipolar electrode units can increase the output voltage of the bipolar battery cell; on the other hand, the parallel connection of several bipolar battery cells can increase the battery capacity of the lithium-ion battery. Therefore, when multiple lithium-ion batteries are connected in series to form a lithium-ion battery module, the number of lithium-ion batteries can be greatly reduced, thereby reducing the number of connectors and effectively avoiding the technical problem of reduced output power of the lithium-ion battery module caused by an excessive number of connectors.

[0003] However, existing batteries only have tabs on the positive and negative electrode units, making it difficult to perform state detection on each bipolar battery unit. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a battery that facilitates the testing of each battery cell.

[0005] This utility model also proposes an electrical device, which includes the battery described above.

[0006] A battery according to an embodiment of the present invention includes: a positive electrode; a negative electrode, wherein the negative electrode and the positive electrode are stacked; a plurality of bipolar electrodes, wherein the bipolar electrodes are stacked between the positive electrode and the negative electrode, and a separator is provided between two adjacent bipolar electrodes, between adjacent bipolar electrodes and the positive electrode, and between adjacent bipolar electrodes and the negative electrode. Each bipolar electrode has a test tab protruding from it. One end of the battery along a first direction is a lead-out end, and the plurality of test tabs are all located at the lead-out end. The first direction is perpendicular to the stacking direction of the positive electrode and the negative electrode.

[0007] According to the battery embodiment of this utility model, test tabs are led out on each bipolar electrode, facilitating the connection between the bipolar electrode and the sampling terminal, and enabling rapid detection of the state of each battery cell using a detection device with multiple sampling terminals. Furthermore, the multiple test tabs are located at the same end of the battery, facilitating the connection between multiple sampling terminals and multiple test tabs, ensuring neat sampling lines, and simplifying detection.

[0008] According to some embodiments of the present invention, in the second direction, a plurality of test tabs are arranged at intervals, and the first direction, the second direction, and the stacking directions of the positive electrode and the negative electrode are perpendicular to each other.

[0009] In some embodiments of this utility model, in the direction from the positive electrode to the negative electrode, the multiple test tabs of the multiple bipolar electrodes are arranged sequentially along the second direction.

[0010] In some embodiments of this invention, the plurality of test tabs are arranged at equal intervals in the second direction.

[0011] In some embodiments of this invention, along the second direction, the distance between two adjacent test tabs is greater than the length of the test tab.

[0012] In some embodiments of this invention, along the second direction, the distance between two adjacent test tabs is greater than twice the length of the test tab.

[0013] According to some embodiments of this utility model, the length of the test electrode is less than or equal to 10 mm.

[0014] According to some embodiments of this utility model, the test tab can be cut and disposed on the bipolar electrode, and the test tab is cut after the battery test is completed.

[0015] According to some embodiments of the present invention, the positive electrode sheet has a positive electrode tab, and the positive electrode tab and the test electrode tab are located at different ends of the battery; and / or, the negative electrode sheet has a negative electrode tab, and the negative electrode tab and the test electrode tab are located at different ends of the battery.

[0016] In some embodiments of this invention, the positive electrode tab and the negative electrode tab are located at opposite ends of the battery.

[0017] In some embodiments of this utility model, the positive electrode tab and the negative electrode tab are respectively located at both ends of the second direction of the battery, and the first direction, the second direction and the stacking direction of the positive electrode sheet and the negative electrode sheet are perpendicular to each other.

[0018] According to some embodiments of the present invention, the positive electrode sheet includes a positive current collector and a positive electrode dressing layer, the positive electrode dressing layer being disposed on the side of the positive current collector facing the negative electrode sheet, and the positive current collector being connected to a positive electrode tab; the negative electrode sheet includes a negative current collector and a negative electrode dressing layer, the negative electrode dressing layer being disposed on the side of the negative current collector facing the positive electrode sheet, and the negative current collector being connected to a negative electrode tab; the bipolar electrode sheet includes a bipolar current collector, a positive electrode dressing layer, and a negative electrode dressing layer, the positive electrode dressing layer being disposed on the side of the bipolar current collector facing the negative electrode sheet, and the negative electrode dressing layer being disposed on the side of the bipolar current collector facing the positive electrode sheet.

[0019] In some embodiments of this utility model, the positive electrode dressing layer is located at the center of the positive electrode current collector, and the distance between each edge of the positive electrode dressing layer and the corresponding edge of the positive electrode current collector is the same; and / or, the negative electrode dressing layer is located at the center of the negative electrode current collector, and the distance between each edge of the negative electrode dressing layer and the corresponding edge of the negative electrode current collector is the same; and / or, the positive electrode dressing layer is located at the center of the bipolar electrode current collector, and the distance between each edge of the positive electrode dressing layer and the corresponding edge of the bipolar current collector is the same; and / or, the negative electrode dressing layer is located at the center of the bipolar electrode current collector, and the distance between each edge of the negative electrode dressing layer and the corresponding edge of the bipolar current collector is the same; and / or, the projections of the plurality of positive electrode dressing layers and the plurality of negative electrode dressing layers in a plane perpendicular to the thickness direction of the bipolar current collector completely coincide.

[0020] In some embodiments of this invention, the diaphragm completely covers the positive electrode dressing layer and the negative electrode auxiliary layer on both sides.

[0021] In some embodiments of this utility model, a sealing film is provided between two adjacent bipolar current collectors, between adjacent bipolar current collectors and the positive current collector, and between adjacent bipolar current collectors and the negative current collector. The sealing film extends along the circumferential direction of the positive current collector, the negative current collector, or the bipolar current collector.

[0022] In some embodiments of this utility model, the positive current collector, the negative current collector, and the plurality of bipolar current collectors are sealed together by a hot pressing process, and hot indentations are formed on the positive current collector, the negative current collector, and the plurality of bipolar current collectors.

[0023] In some embodiments of this utility model, the outer contour of the diaphragm is located inside the outer contour of the positive current collector, the negative current collector, or the bipolar current collector on both sides. The inner edge dimension of the sealing film is smaller than the outer edge dimension of the diaphragm, and the outer edge dimension of the sealing film is larger than the outer edge dimensions of the positive current collector, the negative current collector, and the plurality of bipolar current collectors.

[0024] In some embodiments of this utility model, the outer edge of the sealing film extends 1mm-2mm beyond the corresponding outer edges of the positive current collector, the negative current collector, and the plurality of bipolar current collectors.

[0025] In some embodiments of this utility model, the outer edges of the positive current collector, the negative current collector, and the plurality of bipolar current collectors are flush.

[0026] The electrical device according to an embodiment of the present invention includes the battery described above.

[0027] According to the embodiment of this utility model, the electrical device, by setting the battery described above, has test tabs led out from each bipolar electrode, facilitating the connection between the bipolar electrode and the sampling terminal, and enabling rapid detection of the state of each battery cell when used with a detection device having multiple sampling terminals. Furthermore, the multiple test tabs are located at the same end of the battery, facilitating the connection between the multiple sampling terminals and the multiple test tabs, ensuring the neatness of the sampling lines, and facilitating detection.

[0028] Additional aspects and advantages of this invention 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 the invention. Attached Figure Description

[0029] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0030] Figure 1 This is a top view of a battery according to an embodiment of the present utility model;

[0031] Figure 2 This is a front view of a battery according to an embodiment of the present utility model;

[0032] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0033] Figure 4 This is a top view of the positive electrode and separator of the battery according to an embodiment of the present invention;

[0034] Figure 5This is a top view of the first layer of bipolar electrode and separator of the battery according to an embodiment of the present invention;

[0035] Figure 6 This is a top view of the second bipolar electrode and separator of the battery according to an embodiment of the present invention;

[0036] Figure 7 This is a top view of the third bipolar electrode and separator of the battery according to an embodiment of the present invention;

[0037] Figure 8 This is a top view of the fourth bipolar electrode and separator of the battery according to an embodiment of the present invention;

[0038] Figure 9 This is a top view of the five-layer bipolar electrode and separator of the battery according to an embodiment of the present invention;

[0039] Figure 10 This is a top view of the negative electrode of a battery according to an embodiment of the present invention;

[0040] Figure 11 This is a top view of the sealing film of the battery according to an embodiment of the present utility model;

[0041] Figure 12 This is a front view of a battery according to an embodiment of the present utility model, wherein sampling terminals are provided on the positive electrode tab, the negative electrode tab, and the test electrode tab.

[0042] Figure label:

[0043] 100. Battery;

[0044] 1. Positive electrode sheet; 11. Positive electrode tab; 12. Positive electrode current collector; 13. Positive electrode dressing layer;

[0045] 2. Negative electrode sheet; 21. Negative electrode tab; 22. Negative electrode current collector; 23. Negative electrode dressing layer;

[0046] 3. Bipolar electrode; 31. Test tab; 32. Bipolar current collector;

[0047] 4. Diaphragm;

[0048] 5. Sealing film;

[0049] 6. Hot-press seal marks;

[0050] A. Sampling terminal. Detailed Implementation

[0051] The embodiments of this utility model 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 utility model, and should not be construed as limiting this utility model.

[0052] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0053] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0054] The following is for reference. Figures 1-12 A battery 100 according to an embodiment of the present utility model is described.

[0055] like Figures 1-3 As shown, the battery 100 according to an embodiment of the present invention includes: a positive electrode 1, a negative electrode 2 and a plurality of bipolar electrodes 3.

[0056] Specifically, such as Figures 1-3As shown, negative electrode 2 and positive electrode 1 are stacked, and multiple bipolar electrodes 3 are stacked between positive electrode 1 and negative electrode 2. A separator 4 is provided between two adjacent bipolar electrodes 3, between adjacent bipolar electrodes 3 and positive electrode 1, and between adjacent bipolar electrodes 3 and negative electrode 2. A positive electrode 1, adjacent bipolar electrodes 3, and the separator 4 in between form a battery unit; two adjacent bipolar electrodes 3 and the separator 4 in between form a battery unit; a negative electrode 2, adjacent bipolar electrodes 3, and the separator 4 in between form a battery unit. The battery 100 of this application includes multiple stacked battery units, which are connected in series.

[0057] In addition, such as Figures 1-3 As shown, each bipolar electrode 3 has a test tab 31 protruding from it. One end of the battery 100 along the first direction is the lead-out end, and multiple test tabs 31 are located at the lead-out end. The first direction is the same as the stacking direction of the positive electrode 1 and the negative electrode 2 (e.g., ...). Figure 2 The vertical direction (as shown) is perpendicular. This allows for the detection of the state of each battery cell in each layer.

[0058] exist Figures 1-10 In the example shown, the bipolar electrode 3 has five layers, namely the first layer bipolar electrode 3, the second layer bipolar electrode 3, the third layer bipolar electrode 3, the fourth layer bipolar electrode 3, and the fifth layer bipolar electrode 3. The entire battery 100 is formed by stacking the positive electrode 1, the separator 4, the first layer bipolar electrode 3, the separator 4, the second layer bipolar electrode 3, the separator 4, the third layer bipolar electrode 3, the separator 4, the fourth layer bipolar electrode 3, the separator 4, the fifth layer bipolar electrode 3, the separator 4, and the negative electrode 2 in sequence, forming a total of 6 battery cells.

[0059] Reference Figure 12 The diagram shows a schematic of the state detection process of the battery 100 mentioned in this patent. The positive electrode 1 has a positive electrode tab 11, and the negative electrode 2 has a negative electrode tab 21. The battery 100 state detection device detects the state of the battery 100 by connecting multiple sampling terminals A to the positive electrode tab 11, the test tab 31 on the first layer of bipolar electrode 3, the test tab 31 on the second layer of bipolar electrode 3, the test tab 31 on the third layer of bipolar electrode 3, the test tab 31 on the fourth layer of bipolar electrode 3, the test tab 31 on the fifth layer of bipolar electrode 3, and the negative electrode tab 21.

[0060] The state testing of a first battery cell composed of a positive electrode 1 and a first layer of bipolar electrodes 3 can be achieved by collecting electrical signal data between the positive electrode tab 11 and the test tab 31 on the first layer of bipolar electrodes 3; the state testing of a second battery cell composed of a first layer of bipolar electrodes 3 and a second layer of bipolar electrodes 3 can be achieved by collecting electrical signal data between the test tab 31 on the first layer of bipolar electrodes 3 and the test tab 31 on the second layer of bipolar electrodes 3; the state testing of a third battery cell composed of a second layer of bipolar electrodes 3 and a third layer of bipolar electrodes 3 can be achieved by collecting electrical signal data between the test tab 31 on the second layer of bipolar electrodes 3 and the test tab 31 on the third layer of bipolar electrodes 3; and the state testing of a third battery cell composed of a second layer of bipolar electrodes 3 can be achieved by collecting electrical signal data between the test tab 31 on the second layer of bipolar electrodes 3 and the test tab 31 on the third layer of bipolar electrodes 3. The electrical signal data between the test tab 31 on the fourth bipolar electrode 3 and the test tab 31 on the fourth bipolar electrode 3 can realize the state test of the fourth battery cell composed of the third bipolar electrode 3 and the fourth bipolar electrode 3; the electrical signal data between the test tab 31 on the fourth bipolar electrode 3 and the test tab 31 on the fifth bipolar electrode 3 can realize the state test of the fifth battery cell composed of the fourth bipolar electrode 3 and the fifth bipolar electrode 3; the electrical signal data between the test tab 31 on the fifth bipolar electrode 3 and the negative electrode tab 21 can realize the state test of the sixth battery cell composed of the fifth bipolar electrode 3 and the negative electrode 2; the electrical signal data between the positive electrode tab 11 and the negative electrode tab 21 can realize the state test of the entire battery 100.

[0061] Of course, this utility model is not limited to this. The bipolar electrode 3 can also be two, three, four, or six layers or even more layers.

[0062] In this application, a test tab 31 is led out from each bipolar electrode 3. Combined with a detection device having multiple sampling terminals A, rapid detection of the state of each battery cell can be achieved. Furthermore, in this application, multiple test tabs 31 are located at the same end of the battery 100, facilitating the connection between the multiple sampling terminals A and the multiple test tabs 31, ensuring neat sampling lines, and facilitating detection.

[0063] According to the embodiment of the present invention, the battery 100 has test tabs 31 led out from each bipolar electrode 3, which facilitates the connection between the bipolar electrode 3 and the sampling terminal A, and facilitates the rapid detection of the state of each battery cell with a detection device having multiple sampling terminals A. In addition, the multiple test tabs 31 are located at the same end of the battery 100, which facilitates the connection between the multiple sampling terminals A and the multiple test tabs 31, ensures the neatness of the sampling lines, and facilitates detection.

[0064] In some embodiments of this utility model, such as Figure 1 and Figure 2As shown, in the second direction, multiple test tabs 31 are arranged at intervals, and the first direction, the second direction, and the stacking directions of the positive electrode 1 and the negative electrode 2 are perpendicular to each other. This avoids the risk of short circuits between the electrodes caused by multiple test tabs 31 coming into contact with each other, ensuring the reliability of the battery 100.

[0065] Furthermore, such as Figure 1 and Figure 2 As shown, in the direction from positive electrode 1 to negative electrode 2, multiple test tabs 31 of multiple bipolar electrodes 3 are arranged sequentially along the second direction. It can be understood that in... Figure 1 In the example with five layers of bipolar electrodes 3, the test tabs 31 of the first layer of bipolar electrodes 3, the second layer of bipolar electrodes 3, the third layer of bipolar electrodes 3, the fourth layer of bipolar electrodes 3, and the fifth layer of bipolar electrodes 3 are arranged sequentially along the second direction. Furthermore, the test tabs 31 of the first layer of bipolar electrodes 3, the second layer of bipolar electrodes 3, the third layer of bipolar electrodes 3, the fourth layer of bipolar electrodes 3, and the fifth layer of bipolar electrodes 3 are arranged from bottom to top.

[0066] Furthermore, such as Figure 1 and Figure 2 As shown, in the second direction, multiple test tabs 31 are arranged at equal intervals. This simplifies the structure of the battery 100 and better avoids the risk of short circuits between electrodes caused by multiple test tabs 31 contacting each other, thus ensuring the reliability of the battery 100. It is understandable that... Figure 1 In the example with five layers of bipolar electrodes 3, along the second direction, the distances between the test tabs 31 of the first layer of bipolar electrodes 3 and the test tabs 31 of the second layer of bipolar electrodes 3, the distances between the test tabs 31 of the second layer of bipolar electrodes 3 and the test tabs 31 of the third layer of bipolar electrodes 3, the distances between the test tabs 31 of the third layer of bipolar electrodes 3 and the test tabs 31 of the fourth layer of bipolar electrodes 3, and the distances between the test tabs 31 of the fourth layer of bipolar electrodes 3 and the test tabs 31 of the fifth layer of bipolar electrodes 3 are the same.

[0067] In some embodiments of this invention, along the second direction, the distance between two adjacent test tabs 31 is greater than the length of the test tabs 31. This avoids the situation where one test tab 31 bends and comes into contact with another test tab 31, causing a short circuit between the electrodes, reducing the risk of short circuits between electrodes due to multiple tabs coming into contact, and ensuring the reliability of the battery 100.

[0068] Furthermore, along the second direction, the distance between two adjacent test tabs 31 is greater than twice the length of the test tab 31. This avoids the situation where two adjacent test tabs 31 bend towards each other, causing a short circuit between the electrodes, reducing the risk of short circuits between electrodes due to multiple tab contacts, and ensuring the reliability of the battery 100.

[0069] In some embodiments of this invention, the length of the test tab 31 is less than or equal to 10 mm. This saves costs and better avoids the risk of short circuits between electrodes caused by multiple test tabs 31 contacting each other due to excessive length, thus ensuring the reliability of the battery 100. Preferably, the length of the test tab 31 is 10 mm, which not only reduces the risk of short circuits between electrodes caused by multiple test tabs 31 contacting each other, but also facilitates the connection between the sampling terminal A and the test tab 31, making it easier to detect the status of each battery cell.

[0070] In some embodiments of this invention, the test tab 31 is cut and disposed on the bipolar electrode 3. After the battery 100 is tested, the test tab 31 is cut off. The test tab 31 can be used for testing during the battery 100 testing phase, and can be cut off after the test is completed. Of course, this invention is not limited to this. After the battery 100 is installed, if there is a need to test the battery cells, the test tab 31 may not be cut off and can be used for testing during the battery 100's use.

[0071] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, a positive electrode tab 11 is led out from the positive electrode plate 1, and the positive electrode tab 11 and the test tab 31 are located at different ends of the battery 100. This avoids the risk of short circuit between the electrodes caused by contact between the positive electrode tab 11 and the test tab 31, thus ensuring the reliability of the battery 100.

[0072] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the negative electrode 2 has a negative electrode tab 21, which is located at a different end of the battery 100 from the test tab 31. This avoids the risk of short circuit between the electrodes caused by contact between the negative electrode tab 21 and the test tab 31, thus ensuring the reliability of the battery 100.

[0073] Furthermore, such as Figure 1 and Figure 2As shown, the positive electrode tab 11 and the negative electrode tab 21 are located at opposite ends of the battery 100. The positive electrode tab 11 can be connected to the positive terminal of the battery 100, and the negative electrode tab 21 can be connected to the negative terminal of the battery 100. The positive electrode tab 11 and the negative electrode tab 21 are located at opposite ends of the battery 100. On the one hand, this can prevent short circuits caused by contact between the positive electrode tab 11 and the negative electrode tab 21. On the other hand, it can provide more space at the ends where the positive electrode tab 11 and the negative electrode tab 21 are located, which facilitates the connection between the positive electrode tab 11 and the positive terminal, and the connection between the negative electrode tab 21 and the negative terminal.

[0074] In a specific example of this utility model, such as Figure 1 and Figure 2 As shown, the positive electrode tab 11 and the negative electrode tab 21 are located at opposite ends of the battery 100 in the second direction, and the first direction, the second direction, and the stacking directions of the positive electrode plate 1 and the negative electrode plate 2 are perpendicular to each other. This not only allows the positive electrode tab 11 and the negative electrode tab 21 to be better spaced apart, but also allows both the positive electrode tab 11 and the negative electrode tab 21 to be spaced apart from the test tab 31, better avoiding the problem of short circuits caused by contact between multiple tabs, and facilitating the connection between multiple tabs and other components such as terminals.

[0075] In some embodiments of this utility model, such as Figures 4-10 As shown, the positive electrode 1 includes a positive current collector 12 and a positive electrode dressing layer 13. The positive electrode dressing layer 13 is disposed on the side of the positive current collector 12 facing the negative electrode 2, and the positive current collector 12 is connected to a positive electrode tab 11. The negative electrode 2 includes a negative current collector 22 and a negative electrode dressing layer 23. The negative electrode dressing layer 23 is disposed on the side of the negative current collector 22 facing the positive electrode 1, and the negative current collector 22 is connected to a negative electrode tab 21. The bipolar electrode 3 includes a bipolar current collector 32, a positive electrode dressing layer 13, and a negative electrode dressing layer 23. The positive electrode dressing layer 13 is disposed on the side of the bipolar current collector 32 facing the negative electrode 2, and the negative electrode dressing layer 23 is disposed on the side of the bipolar current collector 32 facing the positive electrode 1.

[0076] The positive electrode tab 11 is led out from the center of one end of the positive current collector 12 in the second direction, and the negative electrode tab 21 is led out from the center of the other end of the negative current collector 22 in the second direction. The test tab 31 is led out from one end of the bipolar current collector 32 in the first direction. The multiple bipolar electrodes 3 are roughly the same in size and structure, only the position of the test tab 31 along the second direction is slightly different.

[0077] For example, in Figure 1 and Figure 2In the example shown, the test tab 31 led out by the second layer bipolar current collector 32 is offset by a certain distance along the second direction compared to the test tab 31 led out by the first layer bipolar current collector 32. The test tab 31 led out by the third layer bipolar current collector 32 is offset by the same distance along the second direction towards the side away from the test tab 31 led out by the first layer bipolar current collector 32, and so on.

[0078] In some embodiments of this utility model, such as Figure 4 As shown, the positive electrode coating layer 13 is located at the center of the positive electrode current collector 12. The distance between each edge of the positive electrode coating layer 13 and the corresponding edge of the positive electrode current collector 12 is the same. This allows the positive electrode coating layer 13 to better contact the electrolyte, participate in the reaction better, and improve the overcurrent capacity of the battery 100.

[0079] In some embodiments of this utility model, such as Figure 10 As shown, the negative electrode coating layer 23 is located at the center of the negative electrode current collector 22. The distance between each edge of the negative electrode coating layer 23 and the corresponding edge of the negative electrode current collector 22 is the same. This allows the negative electrode coating layer 23 to better contact the electrolyte, participate in the reaction better, and improve the overcurrent capacity of the battery 100.

[0080] In some embodiments of this utility model, such as Figure 5 and Figure 9 As shown, the positive electrode coating layer 13 is located at the center of the bipolar current collector, and the distance between each edge of the positive electrode coating layer 13 and the edge of the corresponding bipolar current collector 32 is the same. The negative electrode coating layer 23 is located at the center of the bipolar current collector, and the distance between each edge of the negative electrode coating layer 23 and the edge of the corresponding bipolar current collector 32 is the same. This allows the positive electrode coating layer 13 to have better contact with the electrolyte, and the negative electrode coating layer 23 to have better contact with the electrolyte, thus participating in the reaction better and improving the overcurrent capacity of the battery 100.

[0081] In some embodiments of this invention, the projections of multiple positive electrode dressing layers 13 and multiple negative electrode dressing layers 23 in a plane perpendicular to the thickness direction of the bipolar current collector 32 completely overlap. It is understood that the projections of the positive electrode dressing layer 13 on the positive electrode current collector 12, the negative electrode dressing layer 23 on the negative electrode current collector 22, and the positive electrode dressing layer 13 and negative electrode dressing layer 23 on the bipolar current collector 32 in a plane perpendicular to the thickness direction of the bipolar current collector 32 completely overlap, thereby saving costs while ensuring better contact between the positive electrode dressing layer 13 and the electrolyte, and better contact between the negative electrode dressing layer 23 and the electrolyte.

[0082] In some embodiments of this utility model, such as Figures 4-10As shown, the diaphragm 4 completely covers the positive electrode dressing layer 13 and the negative electrode auxiliary layer 23 on both sides. The diaphragm 4 can separate the positive electrode dressing layer 13 and the negative electrode dressing layer 23.

[0083] In some embodiments of this utility model, a sealing film 5 is provided between two adjacent bipolar current collectors 32, between adjacent bipolar current collectors 32 and positive current collector 12, and between adjacent bipolar current collectors 32 and negative current collector 22. The sealing film 5 extends along the circumferential direction of the positive current collector 12, the negative current collector 22, or the bipolar current collector 32. It can be understood that the sealing film 5 is "U"-shaped.

[0084] For example, in Figure 2 In the example shown, sealing sheets 5 are provided between the positive current collector 12 and the first layer of bipolar current collector 32, between the first layer of bipolar current collector 32 and the second layer of bipolar current collector 32, between the second layer of bipolar current collector 32 and the third layer of bipolar current collector 32, between the third layer of bipolar current collector 32 and the fourth layer of bipolar current collector 32, between the fourth layer of bipolar current collector 32 and the fifth layer of bipolar current collector 32, and between the fifth layer of bipolar current collector 32 and the negative current collector 22. The entire battery 100 is stacked in sequence as follows: positive electrode 1, sealing sheet 5, first layer of bipolar electrode 3, sealing sheet 5, second layer of bipolar electrode 3, sealing sheet 5, third layer of bipolar electrode 3, sealing sheet 5, fourth layer of bipolar electrode 3, sealing sheet 5, fifth layer of bipolar electrode 3, sealing sheet 5, and negative electrode 2.

[0085] This allows for connections between the positive current collector 12 and adjacent bipolar current collectors 32, between the negative current collector 22 and adjacent bipolar current collectors 32, and between two adjacent bipolar current collectors 32. Electrolytes can then be filled between the positive electrode 1 and adjacent bipolar electrode 3, between the negative electrode 2 and adjacent bipolar electrode 3, and between two adjacent bipolar electrode 3. The electrolyte can be solid, liquid, or semi-solid; in particular, when the electrolyte is liquid or semi-solid, leakage problems can be avoided.

[0086] In related technologies, a common method for assembling bipolar batteries involves mounting a separator and bipolar electrodes within a sealed frame, and then stacking multiple sealed frames. However, this bipolar battery structure requires additional battery components, increasing battery costs. Furthermore, the added sealed frame results in a thicker individual battery cell, reducing the battery's energy density and output power.

[0087] In this application, the connection between multiple electrodes is achieved through a sealing film 5, eliminating the need for additional structural components. This results in a compact overall structure, improving the overall energy density of the battery 100 and reducing costs. Consequently, the battery cell thickness is relatively thin, typically 100μm-150μm.

[0088] In some embodiments of this invention, the positive current collector 12, the negative current collector 22, and multiple bipolar current collectors 32 are sealed together by a hot-pressing process, and hot-pressing indentations 6 are formed on the positive current collector 12, the negative current collector 22, and the multiple bipolar current collectors 32. This allows for a sealed connection between adjacent current collectors, preventing leakage and simplifying the operation.

[0089] In specific production processes, for example... Figure 1 As shown, the positive current collector 12, the negative current collector 22, and multiple bipolar current collectors 32 are square. The positive current collector 12 is thermo-sealed with three sides of adjacent bipolar current collectors 32, the negative current collector 22 with adjacent bipolar current collectors 32, and two adjacent bipolar current collectors 32. Liquid is injected between two adjacent electrodes through the open end of the last unsealed side. Finally, the positive current collector 12 with adjacent bipolar current collectors 32, the negative current collector 22 with adjacent bipolar current collectors 32, and two adjacent bipolar current collectors 32 are thermo-sealed with four sides. The adjacent electrodes, together with the central sealing film 5, form a battery cell. During the thermo-sealing process, thermo-sealing marks 6 are generated.

[0090] In some embodiments of this utility model, such as Figures 4-10 As shown, the outer contour of the diaphragm 4 is located inside the outer contours of the positive current collector 12, negative current collector 22, or bipolar current collector 32 on both sides. The inner edge dimension of the sealing film 5 is smaller than the outer edge dimension of the diaphragm 4, and the outer edge dimension of the sealing film 5 is larger than the outer edge dimensions of the positive current collector 12, negative current collector 22, and multiple bipolar current collectors 32. The sealing film 5 is connected to the diaphragm 4, completely separating the positive current collector 12 and the bipolar current collector 32, the negative current collector 22 and the bipolar current collector 32, and two adjacent bipolar current collectors 32, avoiding the risk of short circuits. At the same time, it can save the cost of the diaphragm 4 and facilitate the connection of the sealing film 5.

[0091] The width of the overlapping area between the sealing film 5 and the diaphragm 4 can be 3mm-7mm.

[0092] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the outer edge of the sealing film 5 extends 1mm-2mm beyond the corresponding outer edges of the positive current collector 12, the negative current collector 22, and the multiple bipolar current collectors 32. This ensures that the edges of the stacked electrodes do not contact each other after heat sealing.

[0093] In some embodiments of this invention, the outer edges of the positive current collector 12, the negative current collector 22, and the plurality of bipolar current collectors 32 are flush. This makes the battery 100 appear neater, easier to stack, more compact in structure, and occupies less space.

[0094] The battery 100 structure described in this application is mainly used for the state detection of each battery cell in the battery 100, changing the number of battery cell layers or changing the position of the tabs, but any technical solution that still adopts a multi-side tab structure similar to that described in this patent should be within the scope of protection of this patent.

[0095] The following describes an electrical device according to an embodiment of the present invention.

[0096] The electrical device according to an embodiment of the present invention includes the battery 100 described above.

[0097] Electrical devices can include, but are not limited to, mobile devices, electric vehicles, electric trains, ships and satellites, energy storage systems, etc. Mobile devices can include, for example, mobile phones and laptops; electric vehicles can include, for example, pure electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, electric bicycles, electric scooters, electric golf carts, electric trucks, etc., but are not limited to these.

[0098] Furthermore, the electrical device can be a pure electric vehicle, a hybrid electric vehicle, or a plug-in hybrid electric vehicle. To meet the high power and high energy density requirements of the bipolar battery 100, a battery pack or battery module can be used.

[0099] According to the embodiment of the present invention, the power device, by setting the battery 100 described above, has test tabs 31 led out from each bipolar electrode 3, which facilitates the connection between the bipolar electrode 3 and the sampling terminal A, and facilitates the rapid detection of the state of each battery cell when used with a detection device having multiple sampling terminals A. Furthermore, the multiple test tabs 31 are located at the same end of the battery 100, which facilitates the connection between the multiple sampling terminals A and the multiple test tabs 31, ensuring the neatness of the sampling lines and facilitating detection.

[0100] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. 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.

[0101] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery, characterized in that, include: Positive electrode plate; A negative electrode sheet, wherein the negative electrode sheet and the positive electrode sheet are stacked together; Multiple bipolar electrodes are stacked between the positive electrode and the negative electrode. Separators are provided between adjacent bipolar electrodes, between adjacent bipolar electrodes and the positive electrode, and between adjacent bipolar electrodes and the negative electrode. Each of the bipolar electrodes has a test tab protruding from it. One end of the battery along a first direction is the lead-out end, and multiple test tabs are located at the lead-out end. The first direction is perpendicular to the stacking direction of the positive electrode and the negative electrode.

2. The battery according to claim 1, characterized in that, In the second direction, a plurality of the test tabs are arranged at intervals, and the first direction, the second direction, and the stacking direction of the positive electrode and the negative electrode are perpendicular to each other.

3. The battery according to claim 2, characterized in that, In the direction from the positive electrode to the negative electrode, the multiple test tabs of the multiple bipolar electrodes are arranged sequentially along the second direction.

4. The battery according to claim 2, characterized in that, In the second direction, the plurality of test tabs are arranged at equal intervals.

5. The battery according to claim 2, characterized in that, Along the second direction, the distance between two adjacent test tabs is greater than the length of the test tab.

6. The battery according to claim 5, characterized in that, Along the second direction, the distance between two adjacent test tabs is greater than twice the length of the test tab.

7. The battery according to claim 1, characterized in that, The length of the test electrode is less than or equal to 10 mm.

8. The battery according to claim 1, characterized in that, The test tab can be cut and disposed on the bipolar electrode. After the battery test is completed, the test tab is cut.

9. The battery according to claim 1, characterized in that, The positive electrode plate has a positive electrode tab leading out, and the positive electrode tab and the test electrode tab are located at different ends of the battery; And / or, the negative electrode sheet has a negative electrode tab, and the negative electrode tab and the test tab are located at different ends of the battery.

10. The battery according to claim 9, characterized in that, The positive electrode tab and the negative electrode tab are located at opposite ends of the battery.

11. The battery according to claim 10, characterized in that, The positive electrode tab and the negative electrode tab are located at opposite ends of the battery in a second direction, and the first direction, the second direction, and the stacking direction of the positive electrode and the negative electrode are perpendicular to each other.

12. The battery according to claim 1, characterized in that, The positive electrode sheet includes a positive electrode current collector and a positive electrode dressing layer. The positive electrode dressing layer is disposed on the side of the positive electrode current collector facing the negative electrode sheet, and the positive electrode current collector is connected to a positive electrode tab. The negative electrode sheet includes a negative electrode current collector and a negative electrode dressing layer. The negative electrode dressing layer is disposed on the side of the negative electrode current collector facing the positive electrode sheet, and the negative electrode current collector is connected to a negative electrode tab. The bipolar electrode includes a bipolar current collector, a positive electrode dressing layer, and a negative electrode dressing layer. The positive electrode dressing layer is disposed on the side of the bipolar current collector facing the negative electrode, and the negative electrode dressing layer is disposed on the side of the bipolar current collector facing the positive electrode.

13. The battery according to claim 12, characterized in that, The positive electrode dressing layer is located at the center of the positive electrode current collector, and the distance between each edge of the positive electrode dressing layer and the corresponding edge of the positive electrode current collector is the same; And / or, the negative electrode dressing layer is located at the center of the negative electrode current collector, and the distance between each edge of the negative electrode dressing layer and the corresponding edge of the negative electrode current collector is the same; And / or, the positive electrode dressing layer is located at the center of the bipolar current collector, and the distance between each edge of the positive electrode dressing layer and the corresponding edge of the bipolar current collector is the same; And / or, the negative electrode dressing layer is located at the center of the bipolar current collector, and the distance between each edge of the negative electrode dressing layer and the corresponding edge of the bipolar current collector is the same; And / or, the projections of the plurality of positive electrode dressing layers and the plurality of negative electrode dressing layers in a plane perpendicular to the thickness direction of the bipolar current collector completely overlap.

14. The battery according to claim 12, characterized in that, The diaphragm completely covers the positive electrode dressing layer and the negative electrode auxiliary layer on both sides.

15. The battery according to claim 12, characterized in that, A sealing film is provided between two adjacent bipolar current collectors, between adjacent bipolar current collectors and the positive current collector, and between adjacent bipolar current collectors and the negative current collector. The sealing film extends along the circumferential direction of the positive current collector, the negative current collector, or the bipolar current collector.

16. The battery according to claim 12, characterized in that, The positive current collector, the negative current collector, and the plurality of bipolar current collectors are sealed together by a hot pressing process, and hot indentations are formed on the positive current collector, the negative current collector, and the plurality of bipolar current collectors.

17. The battery according to claim 15, characterized in that, The outer contour of the diaphragm is located inside the outer contour of the positive current collector, the negative current collector, or the bipolar current collector on both sides. The inner edge dimension of the sealing film is smaller than the outer edge dimension of the diaphragm, and the outer edge dimension of the sealing film is larger than the outer edge dimensions of the positive current collector, the negative current collector, and the plurality of bipolar current collectors.

18. The battery according to claim 15, characterized in that, The outer edge of the sealing film extends 1mm-2mm beyond the corresponding outer edges of the positive current collector, the negative current collector, and the plurality of bipolar current collectors.

19. The battery according to claim 12, characterized in that, The outer edges of the positive current collector, the negative current collector, and the plurality of bipolar current collectors are flush.

20. An electrical appliance, characterized in that, Includes the battery according to any one of claims 1-19.

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