Internal series battery and power utilization device
By setting a barrier layer in the aluminum-plastic film, the problem of the battery cells affecting each other during secondary packaging of the inner string batteries is solved, the packaging quality rate and safety performance are improved, and the charging and discharging capacity and service life of the battery are ensured.
Patent Information
- Application Number
- CN202420617197.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-28
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-03-28
AI Technical Summary
During secondary packaging, the internal string battery has different liquid retention volumes of the two battery cells, which affect each other, and the risks cannot be identified in advance, affecting the packaging quality rate and safety performance.
Set up barrier layers in aluminum-plastic film to prevent the battery cells from affecting each other during secondary packaging, through microporous calcium carbonate, polyurethane hard foam, polystyrene foam, phenolic foam or metal-plated polyester/polyimide film materials The barrier layer ensures that the head only encapsulates one side where the barrier layer is not installed, avoids heat transfer, and increases the packaging quality and safety performance.
It effectively avoids the mutual influence of the battery cells during secondary packaging, improves the packaging quality rate and safety performance, and ensures the charging and discharging capacity and service life of the battery.
Smart Images
Figure CN222190945U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of battery structure, and in particular relates to an internal series battery and an electric device. Background Art
[0002] Nowadays, with the development of modern society and the enhancement of people's environmental awareness, more and more devices choose batteries as power sources, such as mobile phones, laptops, power tools and electric vehicles, which provides broad space for the application and development of batteries.
[0003] Among them, the internal series battery achieves the purpose of reducing the temperature rise of the battery charging by splitting and merging the system, which prolongs the battery life to a certain extent and ensures the safety of the battery. However, due to the particularity of its design, sealing two cells at the same time may cause the problem of unequal liquid retention in the two cells, and the risk cannot be identified in advance. If the two cells are sealed twice, there is a situation where the two packages affect each other. Therefore, it is urgent to propose a new technical solution to solve the above problems. Utility Model Content
[0004] One of the purposes of the utility model is to provide an inner series battery to address the deficiencies of the prior art, which prevents two bare cells from influencing each other during secondary packaging by providing a barrier layer.
[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0006] An inner series battery comprises a first battery cell, a second battery cell and an aluminum-plastic film, wherein the aluminum-plastic film is wrapped around the first battery cell and the second battery cell, an intermediate layer is arranged between the first battery cell and the second battery cell, the aluminum-plastic film is provided with a barrier layer, and the barrier layers are respectively arranged in barrier areas corresponding to the packaging areas of the first battery cell and the second battery cell.
[0007] As an improvement of the inner-series battery described in the utility model, the aluminum-plastic film includes a first film body, the first film body is used to wrap the first battery cell, and the barrier layer is arranged at the second sealing area of the first film body corresponding to the second battery cell.
[0008] As an improvement of the internal series battery described in the utility model, the aluminum-plastic film also includes a second film body connected to the first film body, the second film body is used to wrap the second battery cell, and the second film body is provided with the barrier layer at the second sealing area and the liquid injection sealing area corresponding to the first battery cell.
[0009] In the utility model, the material of the barrier layer is one or more of microporous calcium carbonate, polyurethane rigid foam, polystyrene foam plastic, phenolic foam plastic and metal-plated polyester / polyimide film, which has good heat resistance. During the secondary packaging, the head only packages the side where the barrier layer is not provided when contacting the aluminum-plastic film, which can avoid the first battery cell and the second battery cell from affecting each other during the secondary packaging, thereby increasing the packaging quality rate and safety performance of the inner series battery.
[0010] As an improvement of the inner series battery described in the utility model, the first film body and the second film body are both provided with a conventional area connected to the barrier area, and in the conventional area, the first film body and the second film body are both provided with a nylon layer, an aluminum layer and a polypropylene layer stacked in sequence; in the barrier area, the first film body and the second film body are both provided with a nylon layer, an aluminum layer, a barrier layer and a polypropylene layer stacked in sequence, the nylon layer is provided on the side away from the middle layer, the aluminum layer and the polypropylene layer have poor heat resistance, and the barrier layer is provided between the polypropylene layer and the aluminum layer, which can further ensure that the first battery cell and the second battery cell do not affect each other during secondary packaging.
[0011] As an improvement of the inner-string battery described in the utility model, the width W1 of the barrier layer and the width W2 of the packaging area in the width direction of the inner-string battery satisfy the following relationship: W1=W2+a, a is an adjustment constant, 1mm≤a≤3mm, wherein a is preferably 2mm, and the width of the barrier layer is greater than the width of the packaging area, which can further ensure that when the head contacts the aluminum-plastic film, only the side where the barrier layer is not provided is packaged.
[0012] As an improvement of the internal series battery described in the utility model, the spacing between the two barrier layers located in the second film body in the width direction is W3, and W3 and W2 satisfy the relationship: 0mm≤W3≤0.5*W2. The setting of the above distance parameters can further ensure the good sealing performance of the secondary packaging.
[0013] As an improvement of the inner series battery described in the utility model, the thickness D1 of the barrier layer, the thickness D2 of the aluminum layer and the thickness D3 of the polypropylene layer satisfy the following relationship: [(D2+D3) / 2]*50%≤D1≤[(D2+D3) / 2]*60%. The setting of the above parameters can ensure the realization of heat resistance performance while ensuring that the two battery cells to be packaged have equivalent liquid retention and capacity after packaging, further ensuring the charging and discharging capacity and service life of the battery.
[0014] As an improvement of the inner-series battery described in the utility model, the middle layer includes the nylon layer, the aluminum layer and the polypropylene layer stacked in sequence, and the middle layer is used to isolate the first battery cell and the second battery cell to improve the safety performance of the inner-series battery.
[0015] As an improvement of the inner series battery described in the utility model, the first film body and the middle layer form a first accommodating space, and the first accommodating space is located between the first battery cell and the liquid injection sealing area of the first battery cell.
[0016] As an improvement of the internal series battery described in the utility model, the second membrane body and the middle layer form a second accommodating space, the second accommodating space is located between the second battery cell and the liquid injection sealing area of the second battery cell, and the first accommodating space and the second accommodating space are both used to store excess electrolyte and gas generated during formation.
[0017] The second object of the present utility model is to provide an electrical device comprising the internal series batteries as described above.
[0018] The beneficial effect of the utility model is that the inner series battery of the utility model comprises a first battery cell, a second battery cell and an aluminum-plastic film, the aluminum-plastic film is wrapped around the first battery cell and the second battery cell, an intermediate layer is provided between the first battery cell and the second battery cell, the aluminum-plastic film is also provided with a barrier layer, and the barrier layer is respectively provided in the barrier area corresponding to the packaging area of the first battery cell and the second battery cell. The provision of the barrier layer in the utility model enables the inner series battery of the utility model to contact the aluminum-plastic film when the second packaging is performed, and only the side without the barrier layer can be packaged, and the heat generated by the packaging cannot be transferred to the side with the barrier layer, which ensures that the first battery cell and the second battery cell do not affect each other during the second packaging, thereby improving the quality rate of the inner series battery packaging and the safety performance of the inner series battery. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
[0020] Figure 1 It is a cross-sectional schematic diagram of the utility model.
[0021] Figure 2 It is a structural schematic diagram of part of the aluminum-plastic film in the utility model.
[0022] Figure 3 It is a schematic structural diagram of the middle layer of the utility model.
[0023] The reference numerals are described as follows:
[0024] 1-first battery cell;
[0025] 2- the second battery cell;
[0026] 3-aluminum-plastic film; 31-nylon layer; 32-aluminum layer; 33-polypropylene layer; 34-barrier layer; 35-first film body; 36-second film body;
[0027] 4-Middle layer;
[0028] 5- first accommodation space;
[0029] 6- second accommodation space;
[0030] 100 - width direction. DETAILED DESCRIPTION
[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0032] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific implementation methods and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.
[0033] Reference to "embodiment" in this application means that a particular feature, structure or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.
[0034] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0035] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.
[0036] In the present application, the battery cell may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery or a magnesium-ion battery, etc., and the embodiments of the present application are not limited thereto. The battery cell may be cylindrical, flat, rectangular or in other shapes, etc., and the embodiments of the present application are not limited thereto.
[0037] The battery cell includes a battery core and an electrolyte. The battery core is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The positive electrode collector not coated with the positive electrode active material layer serves as the positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide. The negative electrode sheet includes a negative electrode collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode collector. The negative electrode collector not coated with the negative electrode active material layer protrudes from the negative electrode collector coated with the negative electrode active material layer. The negative electrode collector not coated with the negative electrode active material layer serves as the negative electrode tab. The negative electrode current collector may be made of copper, and the negative electrode active material may be carbon or silicon. In order to ensure that a large current can pass without melting, the positive electrode tabs are multiple and stacked together, and the negative electrode tabs are multiple and stacked together. The material of the separator may be PP (polypropylene) or PE (polyethylene).
[0038] The development of battery technology must take into account many design factors at the same time, such as energy density, cycle life, discharge capacity, charge and discharge rate and other performance parameters. In addition, battery safety must also be considered.
[0039] For internal series batteries, since there are multiple battery cells inside, there are safety risks in the secondary packaging regardless of whether the battery cells are packaged simultaneously or individually for multiple times. In view of this, the embodiment of the present application provides a technical solution, by setting a barrier layer at the corresponding position of the battery cell packaging area on the aluminum-plastic film, it is possible to prevent the battery cells from affecting each other during the secondary packaging.
[0040] The following is combined with Figures 1 to 3 The utility model is further described in detail with specific implementation modes, but is not intended to limit the utility model.
[0041] An inner series battery comprises a first battery cell 1, a second battery cell 2 and an aluminum-plastic film 3, wherein the aluminum-plastic film 3 is wrapped around the first battery cell 1 and the second battery cell 2, and an intermediate layer 4 is arranged between the first battery cell 1 and the second battery cell 2, wherein the intermediate layer 4 comprises a nylon layer 31, an aluminum layer 32 and a polypropylene layer 33 stacked in sequence, and the intermediate layer 4 is used to isolate the first battery cell 1 and the second battery cell 2. It is understandable that the intermediate layer 4 may also be made of other materials with isolation properties, which can be adjusted according to actual needs without specific settings.
[0042] Preferably, the aluminum-plastic film 3 includes a first film body 35 and a second film body 36 connected to the first film body 35, the first film body 35 is used to wrap the first battery cell 1, and the second film body 36 is used to wrap the second battery cell 2, the packaging area of the first battery cell 1 includes the second sealing area and the liquid injection sealing area located in the first film body 35, and the packaging area of the second battery cell 2 includes the second sealing area and the liquid injection sealing area located in the second film body 36. In this embodiment, the aluminum-plastic film 3 is not provided at the corresponding position of the liquid injection sealing area of the second battery cell 2, and the barrier area of the first film body 35 is at the second sealing area corresponding to the second battery cell 2. In some other embodiments, when the first film body 35 extends to the corresponding position of the second liquid injection sealing area of the second battery cell 2, the barrier area of the first film body 35 is at the second sealing area and the liquid injection sealing area corresponding to the second battery cell 2; the barrier area of the second film body 36 is at the second sealing area and the liquid injection sealing area corresponding to the first battery cell 1.
[0043] It can be understood that the barrier area is arranged on the other side of the aluminum-plastic film 3 corresponding to the packaging area of the aluminum-plastic film 3 on one side, and can be adjusted according to actual conditions.
[0044] Preferably, the first film body 35 and the second film body 36 are both provided with a conventional area connected to the barrier area. In the conventional area, the first film body 35 and the second film body 36 are both provided with a nylon layer 31, an aluminum layer 32 and a polypropylene layer 33 stacked in sequence; in the barrier area, the first film body 35 and the second film body 36 are both provided with a nylon layer 31, an aluminum layer 32, a barrier layer 34 and a polypropylene layer 33 stacked in sequence.
[0045] In this embodiment, the material of the barrier layer 34 is set to one or more of microporous calcium carbonate, polyurethane rigid foam, polystyrene foam plastic, phenolic foam plastic and metal-plated polyester / polyimide film, which has good heat resistance. During the secondary packaging, the head only packages the side where the barrier layer 34 is not provided when contacting the aluminum-plastic film 3, which can avoid the first battery cell 1 and the second battery cell 2 from affecting each other during the secondary packaging, thereby increasing the packaging quality rate and safety performance of the inner series battery.
[0046] Preferably, the width W1 of the barrier layer 34 and the width W2 of the packaging area in the width direction 100 of the inner battery string satisfy the following relationship: W1=W2+a, a is an adjustment constant, 1mm≤a≤3mm, a is preferably 2mm, the width of the barrier layer 34 is greater than the width of the packaging area, further ensuring that the first battery cell 1 and the second battery cell 2 do not affect each other during the secondary packaging; the spacing between the two barrier layers 34 located in the second film body 36 in the width direction 100 is W3, W3 and W2 satisfy the relationship: 0mm≤W3≤0.5*W2, the setting of the above distance parameters can further ensure the good sealing performance of the secondary packaging.
[0047] Preferably, the thickness D1 of the barrier layer 34, the thickness D2 of the aluminum layer 32 and the thickness D3 of the polypropylene layer 33 satisfy the following relationship: [(D2+D3) / 2]*50%≤D1≤[(D2+D3) / 2]*60%. The setting of these parameters can ensure the realization of heat resistance performance while ensuring that the two battery cells to be packaged have equivalent liquid retention and capacity after packaging, further ensuring the charging and discharging capacity and service life of the battery.
[0048] The inner series battery in this embodiment includes two battery cells. It can be understood that the inner series battery can be set as a structure in which multiple battery cells are wrapped by the aluminum-plastic film 3. It only needs to provide a barrier layer 34 in the barrier area to achieve the effect that multiple battery cells do not affect each other when they are repackaged.
[0049] Preferably, the first film body 35 and the middle layer 4 form a first accommodating space 5, which is located between the first battery cell 1 and the liquid injection sealing area of the first battery cell 1, and the second film body 36 and the middle layer 4 form a second accommodating space 6, which is located between the second battery cell 2 and the liquid injection sealing area of the second battery cell 2. The first accommodating space 5 and the second accommodating space 6 are used to accommodate excess electrolyte and gas generated during battery cell formation, thereby further increasing the safety performance of the internal series battery.
[0050] In order to better demonstrate the beneficial effects of this embodiment, the following examples and comparative examples are provided for comparative explanation.
[0051] Example 1
[0052] Two lithium-ion secondary batteries are used as the first battery cell 1 and the second battery cell 2. The aluminum-plastic film adopts the aluminum-plastic film 3 with a barrier layer mentioned in the present invention, which is wrapped around the first battery cell 1 and the second battery cell 2. An intermediate layer 4 is arranged between the first battery cell 1 and the second battery cell 2. After stacking them in sequence and packaging them twice, an inner series battery is obtained. The material of the barrier layer 34 is microporous calcium carbonate, and the thickness D1 is [(D2+D3) / 2]*55%.
[0053] Example 2
[0054] The difference from the first embodiment is that the thickness D1 of the barrier layer 34 in the present embodiment is equal to [(D2+D3) / 2]*50%. The other parts are the same as those in the first embodiment and will not be described in detail.
[0055] Example 3
[0056] The difference from the first embodiment is that the thickness D1 of the barrier layer 34 in the present embodiment is equal to [(D2+D3) / 2]*60%. The other parts are the same as those in the first embodiment and will not be described in detail.
[0057] Comparative Example 1
[0058] The difference from the first embodiment is that the thickness D1 of the barrier layer 34 in the present embodiment is equal to [(D2+D3) / 2]*45%. The other parts are the same as those in the first embodiment and will not be described in detail.
[0059] Comparative Example 2
[0060] The difference from the first embodiment is that the thickness D1 of the barrier layer 34 in the present embodiment is equal to [(D2+D3) / 2]*65%. The other parts are the same as those in the first embodiment and will not be described in detail.
[0061] Comparative Example 3
[0062] The difference from Example 1 is that the aluminum-plastic film in this embodiment does not include a barrier layer 34. The rest is the same as in Example 1 and will not be described in detail.
[0063] 100 pcs of prepared inner series batteries were prepared from the above-mentioned embodiment and comparative example respectively, and the secondary sealing rate of the battery cells and the uniformity of the liquid retention of the first battery cell and the second battery cell were monitored.
[0064] 5 cells were selected from each group of cells that met the standards. The lithium battery was repeatedly charged and discharged in a 25°C environment through the following steps, and the cycle capacity retention rate of the battery was calculated. First, the first charge and discharge was performed in a 25°C environment, with constant current and constant voltage charging at a charging current of 1C until the upper limit voltage was 4.53V, and then constant current discharge was performed at a discharge current of 0.5C until the final voltage was 3V, and the discharge capacity of the first cycle was recorded; then 300 charge and discharge cycles were performed, and the discharge capacity of the initial and 300th cycles was recorded. The results are shown in Table 1. Among them, the cycle capacity retention rate = (discharge capacity of the 300th cycle / discharge capacity of the first cycle) × 100%.
[0065] Table 1
[0066]
[0067]
[0068] By comparing comparative examples 1-3 and embodiments 1-3, it can be seen that when the aluminum-plastic film 3 with the barrier layer 34 is used as the packaging for the inner-series battery, the mutual influence of the aluminum-plastic films 3 on both sides during the double sealing process is avoided, the superiority rate of the double sealing process is greatly improved, the liquid retention uniformity of the two battery cells is also higher, the obtained battery capacity is more uniform, and better charging and discharging capabilities and cycle life are shown, thereby improving the safety performance of the battery cells; at the same time, a suitable thickness of the barrier layer 34 can also further improve the above performance.
[0069] Electrical devices
[0070] An electrical device includes the above-mentioned internal series battery, and the battery can be a lithium ion battery, a sodium ion battery, a magnesium ion battery, etc. Among them, the electrical device can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, and an electric tool. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle; the spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft; the electric toy includes a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer. The embodiment of the present application does not impose any special restrictions on the above-mentioned electrical devices.
[0071] According to the disclosure and teaching of the above description, the technicians in the field of the utility model can also change and modify the above implementation. Therefore, the utility model is not limited to the above specific implementation, and any obvious improvement, replacement or modification made by the technicians in this field on the basis of the utility model belongs to the protection scope of the utility model. In addition, although some specific terms are used in this specification, these terms are only for the convenience of explanation and do not constitute any limitation to the utility model.
Claims
1. An internal series battery, comprising a first battery cell (1), a second battery cell (2) and an aluminum-plastic film (3), wherein the aluminum-plastic film (3) is wrapped around the first battery cell (1) and the second battery cell (2), and an intermediate layer (4) is arranged between the first battery cell (1) and the second battery cell (2), characterized in that: The aluminum-plastic film (3) is provided with a barrier layer (34), and the barrier layer (34) is respectively provided in barrier areas corresponding to the packaging areas of the first battery cell (1) and the second battery cell (2).
2. The inner series battery as claimed in claim 1, characterized in that: The aluminum-plastic film (3) comprises a first film body (35), the first film body (35) being used to wrap the first battery cell (1), and the barrier layer (34) is provided at a second sealing area of the first film body (35) corresponding to the second battery cell (2).
3. The inner series battery as claimed in claim 2, characterized in that: The aluminum-plastic film (3) further comprises a second film body (36) connected to the first film body (35), the second film body (36) being used to wrap the second battery cell (2), and the second film body (36) is provided with the barrier layer (34) at the second sealing area and the liquid injection sealing area corresponding to the first battery cell (1).
4. The inner series battery as claimed in claim 3, characterized in that: The first film body (35) and the second film body (36) are both provided with a conventional area connected to the barrier area. In the conventional area, the first film body (35) and the second film body (36) are both provided with a nylon layer (31), an aluminum layer (32) and a polypropylene layer (33) stacked in sequence; in the barrier area, the first film body (35) and the second film body (36) are both provided with a nylon layer (31), an aluminum layer (32), a barrier layer (34) and a polypropylene layer (33) stacked in sequence.
5. The inner series battery as claimed in claim 3, characterized in that: The width W1 of the barrier layer (34) and the width W2 of the packaging area in the width direction (100) of the inner series battery satisfy the following relationship: W1=W2+a, where a is an adjustment constant, 1mm≤a≤3mm.
6. The inner series battery as claimed in claim 5, characterized in that: The distance between the two barrier layers (34) located on the second film body (36) in the width direction (100) is W3, and W3 and W2 satisfy the relationship: 0mm≤W3≤0.5*W2.
7. The inner series battery as claimed in claim 4, characterized in that: The thickness D1 of the barrier layer (34), the thickness D2 of the aluminum layer (32) and the thickness D3 of the polypropylene layer (33) satisfy the following relationship: [(D2+D3) / 2]*50%≤D1≤[(D2+D3) / 2]*60%.
8. The inner series battery as claimed in claim 2, characterized in that: The first film body (35) and the intermediate layer (4) form a first accommodating space (5), and the first accommodating space (5) is located between the first battery cell (1) and the liquid injection sealing area of the first battery cell (1).
9. The inner series battery as claimed in claim 3, characterized in that: The second membrane body (36) and the intermediate layer (4) form a second accommodating space (6), and the second accommodating space (6) is located between the second battery cell (2) and the liquid injection sealing area of the second battery cell (2).
10. An electrical device, characterized in that: Comprising the inner series battery as described in any one of claims 1-9.