Battery cell, battery cell module, battery pack and electric equipment

Abstract

The utility model relates to the technical field of batteries, and provides a battery cell, a battery cell module, a battery pack and electric equipment.The battery cell comprises a shell, a pole core and an end cover structure, at least one positive tab and at least one negative tab are formed at the two ends of the pole core respectively, the positive tabs located at the two ends of the pole core are arranged in a staggered mode in the width direction of the pole core, and the negative tabs located at the two ends of the pole core are arranged in a staggered mode in the width direction of the pole core. The cathode lugs are arranged at two ends of the pole core in a staggered manner in the width direction of the pole core, the end cover structure comprises a positive pole column, a negative pole column and an explosion-proof structure, the positive pole lug and the negative pole lug are asymmetrically arranged relative to the center line, and the explosion-proof structure is correspondingly arranged at the end part of the pole core in the width direction. The comprehensive performance of the battery cell can be effectively improved, and stable performance can be ensured for a long time.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a battery cell, a battery cell module, a battery pack, and an electrical device using the same. Background Art

[0002] In recent years, with the rapid popularization of new energy vehicles, various power batteries and energy storage batteries have also made remarkable progress. Especially with the increasing demand for charging speed and endurance of new energy vehicles, the demand for large-capacity and large-size batteries has increased sharply. The batteries used in new energy vehicles are generally installed on the vehicle in the form of a battery pack composed of battery cell modules. The overall performance of the battery pack is determined by the performance of each battery cell module, and the performance of each battery cell module depends on whether each battery cell that makes up the battery cell module can work stably for a long time and the performance level of each battery cell itself.

[0003] There are many factors that affect the working state and performance level of the battery cell. Among them, relatively important factors include the setting of the pole column of the battery cell, the setting of the explosion-proof valve, etc. With the increasing application of large-capacity and large-size batteries, especially the increasing use of such battery packs, how to ensure the long-term stable use of the battery pack under high performance has become the main challenge content and research direction. During the assembly process of the battery pack, not only the overall performance of the battery pack needs to be considered, but also the service performance of each battery cell module needs to be taken into account. More importantly, the inherent properties of a single battery cell need to be emphasized. As the capacity and size of the battery pack increase, the inherent properties of a single battery cell become more important. Its property level and the strength of performance stability will directly determine the number of later repairs and the difficulty, and also directly determine the overall performance of the battery pack. The battery cells in the related art generally focus on the design of functions and modules, while ignoring the design of details, resulting in unstable performance of the battery cells and easy occurrence of failures. Summary of the Utility Model

[0004] This application provides a battery cell, a battery cell module, a battery pack, and an electrical device using the same, which can effectively improve the comprehensive performance of the battery cell and ensure stable performance for a long time.

[0005] One aspect of this application provides a battery cell, including:

[0006] A housing having a receiving cavity;

[0007] An electrode core disposed in the receiving cavity. At least one positive electrode tab and at least one negative electrode tab are formed at each end of the electrode core. The positive electrode tabs at both ends of the electrode core are staggered in the width direction of the electrode core, and the negative electrode tabs at both ends of the electrode core are staggered in the width direction of the electrode core.

[0008] and an end cap structure, which is arranged at both ends of the electrode core and can enclose the electrode core in the housing. The end cap structure includes an explosion-proof structure, a positive electrode post electrically connected to the positive electrode tab, and a negative electrode post electrically connected to the negative electrode tab.

[0009] Wherein, in the width direction of the electrode core, there is a central dividing line that divides the width dimension into two equal parts. The positive electrode tab and the negative electrode tab are asymmetrically arranged with respect to the central dividing line, and the explosion-proof structure is correspondingly arranged at the end in the width direction of the electrode core.

[0010] The battery cell in the embodiment of the present application includes a housing, an electrode core, and an end cap structure. Structurally, due to the arrangement of at least one positive electrode tab and one negative electrode tab at both ends of the electrode core, the electrode core has at least two pairs of positive and negative electrode tabs. Correspondingly, the battery cell also includes at least two pairs of positive and negative electrode posts. This structural configuration enables the battery cell not to be paralyzed due to the damage of individual electrode tabs and electrode posts. The electrode tabs and electrode posts in the normal state can serve as alternative options for the battery cell to continue to be used, thereby providing a prerequisite for the long-term stable use of the battery cell. Secondly, the arrangement of one pair of positive electrode tabs and negative electrode tabs at both ends can directly establish an electronic circuit at both ends. For any electronic circuit, it can greatly shorten the electronic path of the battery cell and effectively reduce energy loss. Thirdly, in the battery cell in the embodiment of the present application, the positive electrode tab and the negative electrode tab are not symmetrically arranged in the width direction of the electrode core, that is, they are in an asymmetric relationship with respect to the central dividing line. This design breaks the traditional design concept, provides a larger operating space for the assembly and later maintenance of the battery cell, and also provides more space options for the arrangement of other components (such as the explosion-proof structure). This asymmetric space design principle of the battery cell provides a space basis for the performance balance and stability of the battery cell, and can improve the performance ratio of other components without affecting the performance of the electrode tabs and electrode posts. Finally, in the battery cell in the embodiment of the present application, the explosion-proof structure is arranged at the end in the width direction of the electrode core. When the battery cell is in use, the explosion-proof structure can be at the upper end and can be as far away from the electrolyte area as possible. At this time, it can avoid the electrolyte from corroding the explosion-proof valve. When the explosion-proof structure is opened for operation, it can also prevent the high-temperature gas from rising and affecting other structures of the battery cell. In addition, the position setting of the explosion-proof structure can also achieve the rapid discharge of gas and the rapid cooling of the battery cell.

[0011] In summary, the battery cell in the embodiment of the present application can effectively improve the comprehensive performance of the battery cell through the arrangement of the electrode tabs, electrode posts, and explosion-proof structure, and can ensure stable performance for a long time.

[0012] In a possible implementation manner, the positive electrode tab and the negative electrode tab at the same end of the electrode core are arranged on both sides of the central dividing line.

[0013] In a possible implementation, one of the positive electrode tab and the negative electrode tab located at the same end of the electrode core is flush with the middle dividing line.

[0014] In a possible implementation, one of the positive electrode tab and the negative electrode tab located at the same end of the electrode core is located on one side of the middle dividing line, and the other is at least partially located on the same side of the middle dividing line.

[0015] In a possible implementation, the positive electrode tab and the negative electrode tab located at the same end of the electrode core are located on the same side of the middle dividing line.

[0016] In a possible implementation, the width of the electrode core is D0, the width of the positive electrode tab is D1, the width of the negative electrode tab is D2, and D0, D1, and D2 satisfy the relational expression:

[0017] 0.05 ≤ D1 / D0 < 0.42; 0.05 ≤ D2 / D0 < 0.42.

[0018] In a possible implementation, the area for correspondingly installing the explosion-proof structure in the width direction of the electrode core is the explosion-proof installation area. The edge of the electrode core along its width direction forms the first boundary of the explosion-proof installation area. The edge of the positive electrode tab and the negative electrode tab that is close to the first boundary along the width direction forms the second boundary of the explosion-proof installation area. The width of the explosion-proof installation area is D3, and D0 and D3 satisfy the relational expression:

[0019] 0.1D0 ≤ D3 ≤ 0.35D0.

[0020] In a possible implementation, the distance between the positive electrode tab and the negative electrode tab is L, and L satisfies the relational expression:

[0021] L ≥ 5 mm.

[0022] In a possible implementation, the end cover structure includes a cover plate, and the explosion-proof structure, the positive electrode column, and the negative electrode column are all arranged on the cover plate.

[0023] In a possible implementation, at least one liquid injection hole is arranged on the cover plate.

[0024] In a possible implementation, the end cover structure further includes an insulating plate, and the insulating plate is located inside the cover plate.

[0025] In a possible implementation manner, the end cap structure further includes a positive electrode lead piece and a negative electrode lead piece. The positive electrode lead piece is connected to the positive electrode tab, and the negative electrode lead piece is connected to the negative electrode tab. The insulating plate is disposed between the positive electrode lead piece and the positive electrode column, and the insulating plate is disposed between the negative electrode lead piece and the negative electrode column.

[0026] In a possible implementation manner, the electrode core includes a positive electrode sheet, a negative electrode sheet, and a separator. Each of the two ends of the positive electrode sheet forms a positive electrode tab, and the positive electrode tabs located at the two ends of the positive electrode sheet are staggeredly arranged in the width direction of the positive electrode sheet. Each of the two ends of the negative electrode sheet forms a negative electrode tab, and the negative electrode tabs located at the two ends of the negative electrode sheet are staggeredly arranged in the width direction of the negative electrode sheet.

[0027] A second aspect of the present application provides an electric core module, including a plurality of electric cores. The electric cores are the electric cores according to the first aspect. The electric cores have a first end and a second end. The plurality of electric cores are stacked so that the first end and the second end can be alternately arranged to form either end of the electric core module.

[0028] The electric core module in the embodiment of the present application includes a plurality of electric cores of the first aspect, and the first ends and the second ends of the plurality of electric cores are alternately connected to form either end of the electric core module, so that either end of the electric core module can form an electronic circuit during use, and the two ends can form two electronic circuits. For a single electronic circuit, the electronic transmission path can be greatly shortened, the impedance can be reduced, and the overcurrent capacity of the electric core module can be improved. For the two electronic circuits, an alternative solution is provided for the smooth connection of the electric core module, and the long-term stable use of the electric core module can be ensured.

[0029] In a possible implementation manner, either end of the electric core module has at least two groups of pole column groups. In each pole column group, the positive electrode columns and the negative electrode columns are alternately arranged. A connecting piece is connected between two adjacent electric cores. Along the thickness direction of the electric core module, there are at least two groups of connecting pieces, and each group of connecting pieces is used to connect a group of pole column groups.

[0030] In a possible implementation manner, the connecting piece is disposed at either end of the electric core module.

[0031] A third aspect of the present application provides a battery pack, including the electric core module according to the second aspect.

[0032] The battery pack in the embodiment of the present application has relatively high comprehensive performance and can remain stable for a long time.

[0033] A fourth aspect of the present application provides an electrical device, including the battery pack according to the third aspect. Description of the Drawings

[0034] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0035] Figure 1 It shows a schematic structural diagram of a battery cell module provided according to an embodiment of the present application;

[0036] Figure 2 It shows a schematic end structure diagram of a battery cell module provided according to an embodiment of the present application;

[0037] Figure 3 It shows a schematic structural diagram of a battery cell provided according to an embodiment of the present application;

[0038] Figure 4 It shows an exploded view of a battery cell provided according to an embodiment of the present application;

[0039] Figure 5 It shows a sectional view of a battery cell provided according to an embodiment of the present application;

[0040] Figure 6 It shows a schematic structural diagram of the A end of a battery cell provided according to an embodiment of the present application;

[0041] Figure 7 It shows a schematic structural diagram of the B end of a battery cell provided according to an embodiment of the present application;

[0042] Figure 8 It shows an exploded view of an electrode core provided according to an embodiment of the present application;

[0043] Figure 9 It shows an exploded view of another battery cell provided according to an embodiment of the present application.

[0044] Reference numerals:

[0045] 10 - battery cell module; 11 - pole column group; 12 - connecting piece;

[0046] 20 - battery cell; 21 - liquid injection hole; 22 - first end; 23 - second end; 24 - mid - dividing line;

[0047] 100 - housing; 101 - receiving cavity;

[0048] 200 - Extreme core; 201 - A end; 202 - B end; 203 - C end; 204 - D end; 205 - Explosion - proof installation area; 210 - Positive tab; 220 - Negative tab; 230 - Positive electrode plate; 240 - Negative electrode plate; 250 - Separator;

[0049] 300 - End - cover structure; 310 - Positive terminal; 320 - Negative terminal; 330 - Explosion - proof structure; 340 - Cover plate; 350 - Insulating plate; 360 - Positive lead - out piece; 370 - Negative lead - out piece. Detailed implementation manners

[0050] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0051] The embodiments of the present application provide a battery pack. The battery pack can be a large - capacity and large - size battery pack or other types of battery packs. In the embodiments listed below, unless otherwise specified, the battery pack can be understood as a large - capacity and large - size battery pack. The battery pack in the embodiments of the present application has the advantages of relatively high comprehensive performance and being able to maintain stability for a long time through the detailed structural design of the battery cells.

[0052] The battery pack in the embodiments of the present application can be applied to electrical equipment. The electrical equipment can be a vehicle. Among them, the vehicle can be a sedan, a bus, a truck, etc.

[0053] The vehicle can include a vehicle body, an axle, and a motor. Among them, the battery pack, the axle, and the motor can all be arranged on the vehicle body. The battery pack can be electrically connected to the motor. The motor can be connected to the axle. The battery pack can supply power to the motor so that the motor can rotate, and the motor can drive the axle to rotate during rotation, so that the vehicle can travel.

[0054] Among them, the vehicle body can include a vehicle chassis and a body arranged on the chassis. The body can have a passenger compartment. A driver's cab and multiple seats can be arranged in the passenger compartment. The driver can sit in the driver's cab to operate the vehicle. For example, structural components such as a steering wheel, a clutch, and a brake that enable the vehicle to achieve complete functions can also be arranged on the body. The present application does not make any limitations.

[0055] In an embodiment of the present application, the battery pack may include a lower housing and a battery cell module located in the lower housing. A power connection piece is provided between the battery cell modules to electrically connect the battery cell modules. The specific structure and type of the battery pack in the present application can be set according to requirements, and the three-dimensional spatial structure of the power connection piece can also be designed according to the arrangement mode of each battery cell module. For example, the power connection piece can be designed into a planar sheet structure or a multi-sheet structure formed by sequentially connecting multiple bends. In addition, some parts of the power connection piece can adopt a hollow design to achieve the effects of cost reduction and strength improvement.

[0056] In the prior art, the battery cell module is prone to failures during use. The factors causing these failures may be problems in the structural composition of the battery cell module, problems in heat generation and heat dissipation of the battery cell module, or may be caused by poor electrical conduction. As the basic component unit of the battery cell module, the performance level and stability of the battery cell itself play a key role in the overall performance of the battery cell module. For example, existing battery cells generally only focus on the design of functions and modules. For example, their structural types are relatively fixed, generally including a housing, an electrode core, etc. Then, the battery cells can be quickly formed through a modular assembly method. At the same time, in the design, a symmetrical design is pursued, while ignoring the balance in the overall performance. This pursuit and inherent design method make the existing battery cells unstable in performance and prone to failures.

[0057] Figure 1 FIG. shows a schematic structural diagram of a battery cell module provided according to an embodiment of the present application; Figure 2 FIG. shows a schematic end structure diagram of a battery cell module provided according to an embodiment of the present application.

[0058] Please refer to Figure 1 and Figure 2 , the battery cell module 10 in the embodiment of the present application is configured with a battery cell 20 that is different from the prior art. The battery cell 20 has excellent comprehensive performance and can ensure stable performance for a long time.

[0059] In the embodiment of the present application, the battery cell 20 is mainly optimized in structure to achieve the purpose of obtaining high benefits at low cost. Other design elements of the battery cell 20, such as material selection, etc., can be designed with reference to related technologies.

[0060] It can be known that, apart from factors such as material selection, the indicators affecting the overall performance and performance stability of the battery cell 20 mainly come from the positional relationship, spatial range configuration, and respective dimensional relationships among the components of the battery cell 20. Based on the above considerations, the embodiments of the present application redesigned the structure of the battery cell 20. The focus of the design is to give full play to the performance of the components of the battery cell 20 by reasonably configuring the positional relationship and spatial proportion of the components of the battery cell 20, and at the same time make a certain degree of positive excitation to the performance, so that the battery cell 20 has excellent comprehensive performance. When designing, the issue of use stability was also considered, so the local structure of the battery cell 20 was also innovated to meet the use requirements.

[0061] Figure 3 FIG. 4 shows a schematic structural diagram of a battery cell provided by an embodiment of the present application; Figure 4 FIG. 5 shows an exploded schematic diagram of a battery cell provided by an embodiment of the present application; Figure 5 FIG. 6 shows a sectional view of a battery cell provided by an embodiment of the present application; Figure 6 FIG. 7 shows a schematic structural diagram of end A of a battery cell provided by an embodiment of the present application; Figure 7 FIG. 8 shows a schematic structural diagram of end B of a battery cell provided by an embodiment of the present application. Please refer to Figures 3 to 7 , in the embodiment of the present application, the battery cell 20 includes a housing 100, an electrode core 200, and an end cap structure 300.

[0062] The housing 100 serves as a protective component of the battery cell 20 and plays a role in protecting the internal components of the battery cell 20. It is generally made of temperature-resistant materials such as a steel shell, an aluminum shell, or a soft package material. The housing 100 has a receiving cavity 101, and other components of the battery cell 20, such as the electrode core 200, can be received in the receiving cavity 101.

[0063] The electrode core 200 is the core component of the battery cell 20 and plays a role in storing and releasing electrical energy. The electrode core 200 is disposed in the receiving cavity 101 of the housing 100. At least one positive tab 210 and one negative tab 220 are formed at each end of the electrode core 200. The positive tabs 210 located at both ends of the electrode core 200 are staggered in the width direction of the electrode core 200, and the negative tabs 220 located at both ends of the electrode core 200 are staggered in the width direction of the electrode core 200.

[0064] It should be noted here that the ends of the electrode core 200 refer to both ends in the length direction of the electrode core 200. Taking a square battery cell as an example, please refer to Figure 3 and Figure 4, the ends of the electrode core 200 refer to the A end 201 and the B end 202. For any end of the electrode core 200, such as the A end 201, at least one positive tab 210 and one negative tab 220 are provided at this end. The positive tab 210 and the negative tab 220 can form a set of tab pairs. At the same time, at the other end, such as the B end 202, at least one positive tab 210 and one negative tab 220 are also provided. The positive tab 210 and the negative tab 220 can also form a set of tab pairs. At least two sets of tab pairs located at both ends of the electrode core 200 are arranged in reverse. Specifically, taking the formation of a set of tab pairs at any end of the electrode core 200 as an example, for the tab pair located at the A end 201, the positive tab 210 is at one end in the width direction of the electrode core 200, such as the C end 203, and the negative tab 220 is at the other end in the width direction of the electrode core 200, such as the D end 204. For the tab pair located at the B end 202, the positive tab 210 is at the D end 204 in the width direction of the electrode core 200, and the negative tab 220 is at the C end 203 in the width direction of the electrode core 200. It shows that the positive tabs 210 located at both ends of the electrode core 200 are staggered in the width direction of the electrode core 200, and the negative tabs 220 located at both ends of the electrode core 200 are staggered in the width direction of the electrode core 200.

[0065] The advantage of this multi-tab setting is that when a part of the tabs is damaged, the other part of the tabs can still be put into use. When the battery cell 20 encounters an emergency, such as accidental local high temperature or accidental severe vibration, which may cause the battery cell 20 to be unable to be used normally, the other part of the tabs can still ensure the normal use of the battery cell 20.

[0066] The end cap structure 300 is the input and output point for the electrical energy input or output of the battery cell 20, that is, external electrical energy can be input into the battery cell 20 through the end cap structure 300, and the battery cell 20 can also transmit electrical energy to the outside through the end cap structure 300. The end cap structure 300 can also be used as the capping component of the battery cell 20, and it can enclose the electrode core 200, etc. in the housing 100 together with the housing 100. The end cap structure 300 can also play a necessary explosion-proof role. In the embodiment of the present application, please refer to Figure 4 , the end cap structure 300 is provided at both ends of the electrode core 200, and it includes an explosion-proof structure 330, a positive terminal 310 electrically connected to the positive tab 210, and a negative terminal 320 connected to the negative tab 220.

[0067] It can be understood that the part of the end cap structure 300 other than the positive terminal 310 and the negative terminal 320 generally does not have electrical conductivity to prevent short circuits between the terminals. Therefore, the main structure of the end cap structure 300 is generally made of an insulating material, while the positive terminal 310 and the negative terminal 320 that play a conductive role need to be made of a conductive material. The function of the explosion-proof structure 330 is to start when the internal temperature of the battery cell 20 is too high, so as to relieve the pressure of the battery cell 20. The explosion-proof structure 330 can be automatically opened under preset conditions or can be set to be opened passively.

[0068] In the above battery cell 20, please refer to Figure 5 , there is a center line 24 in the width direction of the electrode core 200 that divides the width dimension into two equal parts. The positive tab 210 and the negative tab 220 are asymmetrically arranged with respect to the center line, and the explosion-proof structure 330 is correspondingly arranged at the end in the width direction of the electrode core 200.

[0069] It should be noted here that please refer to Figure 5 , the center line is a virtual line in the width direction of the electrode core 200, which is only for the convenience of description. Based on this center line 24, the positive tab 210 and the negative tab 220 are in an asymmetric setting relationship with respect to the center line 24, which breaks the conventional thinking about tab design of the battery cell 20 and lays a foundation for arranging the tabs or other components of the battery cell 20 and balancing the performance of the tabs and other components of the battery cell 20.

[0070] The battery cell 20 in the embodiment of the present application includes a housing 100, an electrode core 200, and an end cap structure 300. Structurally, due to the arrangement of at least one positive electrode tab 210 and one negative electrode tab 220 at each end of the electrode core 200, the electrode core 200 has at least two pairs of positive and negative electrode tabs. Correspondingly, the battery cell 20 also includes at least two pairs of positive and negative electrode posts. This structural configuration ensures that the battery cell 20 will not malfunction due to damage to individual electrode tabs or electrode posts. The normal electrode tabs and electrode posts can serve as alternative options for the battery cell 20 to continue operating, thus providing a prerequisite for the long-term stable use of the battery cell 20. Secondly, the arrangement of one pair of positive electrode tabs 210 and negative electrode tabs 220 at each end can directly establish electronic circuits at both ends. For any electronic circuit, it can greatly shorten the electronic path of the battery cell 20 and effectively reduce energy loss. Thirdly, in the battery cell 20 of the embodiment of the present application, the positive electrode tab 210 and the negative electrode tab 220 are not symmetrically arranged in the width direction of the electrode core 200, that is, they are asymmetric with respect to the midline 24. This design breaks the traditional design concept, providing more operating space for the assembly and subsequent maintenance of the battery cell 20. At the same time, it also provides more space options for the arrangement of other components (such as the explosion-proof structure 330). This asymmetric space design principle of the battery cell 20 provides a space basis for the performance balance and stability of the battery cell 20, enabling the improvement of the performance ratio of other components without affecting the performance of the electrode tabs and electrode posts. Finally, in the battery cell 20 of the embodiment of the present application, the explosion-proof structure 330 is arranged at the end in the width direction of the electrode core 200. When the battery cell 20 is in use, the explosion-proof structure 330 can be at the upper end, as far as possible from the area where the electrolyte is located, thus avoiding the corrosion of the explosion-proof valve by the electrolyte. When the explosion-proof structure 330 is activated, it can also prevent the hot gas from rising and affecting other structures of the battery cell 20. In addition, the position setting of the explosion-proof structure 330 can also achieve the rapid discharge of gas and the rapid cooling of the battery cell 20.

[0071] In the embodiment of the present application, the arrangement rule of the positive electrode tab 210 and the negative electrode tab 220 is based on asymmetry with respect to the midline 24. At the same time, the explosion-proof structure 330 needs to be arranged on one side of the positive electrode tab 210 and the negative electrode tab 220, that is, the explosion-proof structure 330 is not between the positive electrode tab 210 and the negative electrode tab 220, but at the end in the width direction of the electrode core 200. As a general principle, in actual implementation, the positive electrode tab 210 and the negative electrode tab 220 have various combination methods in different situations. Correspondingly, the positive electrode post 310 in the end cap structure 300 should be arranged corresponding to the positive electrode tab 210, and the negative electrode post 320 in the end cap structure 300 should also be arranged corresponding to the negative electrode tab 220.

[0072] In some embodiments, the positive electrode tab 210 and the negative electrode tab 220 are disposed on both sides of the middle dividing line 24. Specifically, taking the middle dividing line 24 as the demarcation line, the electrode core 200 has two equal regions in its width direction. In these embodiments, the positive electrode tab 210 is completely within one of the regions, and the negative electrode tab 220 is completely within the other region. However, it can be understood that the distance from the positive electrode tab 210 to the middle dividing line 24 is not equal to the distance from the negative electrode tab 220 to the middle dividing line 24.

[0073] In the above embodiments, taking the middle dividing line 24 as a reference, it is relatively convenient to configure the positive electrode tab 210 and the negative electrode tab 220 for the battery cell 20 during design. By designing the distance relationship between the positive electrode tab 210 and the negative electrode tab 220 to the middle dividing line 24, a good design space can be provided for the explosion-proof structure 330, and at the same time, the performance can be easily matched to achieve the optimization of the comprehensive performance.

[0074] In some other embodiments, the edge of one of the positive electrode tab 210 and the negative electrode tab 220 is flush with the middle dividing line 24. Specifically, both the positive electrode tab 210 and the negative electrode tab 220 have a side closer to the middle dividing line 24, and this side forms the above-mentioned edge. Here, being flush with the center means that the side of the positive electrode tab 210 or the negative electrode tab 220 closer to the middle dividing line is flush with the middle dividing line 24. However, it can be understood that only one of the positive electrode tab 210 and the negative electrode tab 220 is flush with the middle dividing line 24.

[0075] In these other embodiments, taking the middle dividing line 24 as a reference, directly setting the edge of one of the positive electrode tab 210 and the negative electrode tab 220 flush on the middle dividing line 24 is beneficial to the arrangement of the positive electrode tab 210 and the negative electrode tab 220. After that, by designing the distance between the positive electrode tab 210 and the negative electrode tab 220, a design space can be provided for the explosion-proof structure 330, and the optimization of the comprehensive performance can also be achieved.

[0076] In some other embodiments, one of the positive electrode tab 210 and the negative electrode tab 220 is located on one side of the middle dividing line 24, and the other is at least partially located on the same side of the middle dividing line 24. Specifically, in this part of the embodiments, the electrode core 200 is divided into two equal regions in its width direction by the middle dividing line 24. One of the positive electrode tab 210 and the negative electrode tab 220 is completely within one of the regions, and the other of the positive electrode tab 210 and the negative electrode tab 220 straddles the two regions. However, it can be understood that as a better range, this straddling should not exceed half of the positive electrode tab 210 or the negative electrode tab 220, that is, only a small part of the positive electrode tab 210 or the negative electrode tab 220 extends from one region into the other region.

[0077] In some other embodiments, the positive electrode tab 210 and the negative electrode tab 220 will further free up space in the width direction of the electrode core 200, providing more space for the arrangement of other components such as the explosion-proof structure 330. It should be understood that since the space occupation ratio of the positive electrode tab 210 and the negative electrode tab 220 becomes smaller, the materials of the positive electrode tab 210 and the negative electrode tab 220 can be upgraded to avoid overheating and other situations of the positive electrode tab 210 and the negative electrode tab 220.

[0078] In some other embodiments, the positive electrode tab 210 and the negative electrode tab 220 are located on the same side of the middle dividing line 24. Specifically, in this part of the embodiments, the electrode core 200 is divided into two equal regions in its width direction by the middle dividing line 24, and the positive electrode tab 210 and the negative electrode tab 220 are in the same region.

[0079] In the above embodiments, when the electrode core 100 has a larger size, more design space can be provided for the explosion-proof structure 330.

[0080] The above lists the possible configuration relationships of the positive electrode tab 210 and the negative electrode tab 220 under the technical concept of this application. It can be understood that in other embodiments not mentioned in this article, the configuration relationship can also be changed without departing from the spirit and essence of this application.

[0081] It should be noted that the above mainly describes the positive electrode tab 210, the negative electrode tab 220 and the explosion-proof structure 330 in terms of the configuration relationship in the width direction of the electrode core 200. It can be understood that, please refer to Figure 6 and Figure 7 , for the positive electrode post 310 and the negative electrode post 320, they can be set in the same way as the above relationship, or other designs can be made for the positive electrode post 310 and the negative electrode post 320 without affecting the conductivity. In addition, the description of the explosion-proof structure 330 is mainly in correspondence with the electrode core 200, which does not mean that the explosion-proof structure 330 is directly installed on the electrode core 200.

[0082] In some embodiments, please refer to Figure 5 , the width of the electrode core 200 is D0, the width of the positive electrode tab 210 is D1, the width of the negative electrode tab 220 is D2, and D0, D1 and D2 satisfy the relational expression:

[0083] 0.05 ≤ D1 / D0 < 0.42; 0.05 ≤ D2 / D0 < 0.42.

[0084] Taking the positive tab 210 as an example, its width dimension cannot be designed too small, otherwise it will easily affect the over-current capacity of the battery cell 20, and the positive tab 210 is prone to severe heat generation, thus affecting the performance of the battery cell 20. Through research, it is found that designing the width of the positive tab 210 to meet the minimum requirement of 0.05 ≤ D1 / D0 can relatively balance the dimensional relationship between the positive tab 210 and the electrode core 200, and can ensure performance stability. For example, D1 / D0 can take the following values: 0.05, 0.07, 0.1, 0.2, etc. When D1 / D0 takes the above values, the positive tab 210 has better over-current capacity; similarly, the negative tab 220 has the same consideration and will not be elaborated here. For the upper limit of the width of the positive tab 210, considering factors such as the processing error of the battery cell 20 and overlapping short circuits, designing it to meet D1 / D0 < 0.42 has high performance stability, and at the same time, it can also have enough margin to set other components such as the explosion-proof structure 330 when the positive tab 210 and the negative tab 220 do not overlap.

[0085] In some embodiments, please refer to Figure 5 , in the width direction of the electrode core 200, the area for correspondingly installing the explosion-proof structure 330 is the explosion-proof installation area 205. The edge of the electrode core 200 along its width direction forms the first boundary of the explosion-proof installation area 205, and the edge of the positive tab 210 and the negative tab 220 that is close to the first boundary along the width direction forms the second boundary of the explosion-proof installation area 205. The width of the explosion-proof installation area 205 is D3, and this width D3 is the distance between the first boundary and the second boundary. D0 and D3 satisfy the relationship:

[0086] 0.1D0 ≤ D3 ≤ 0.35D0.

[0087] Here, a dimensional ratio relationship is established between the explosion-proof installation area 205 and the overall width of the electrode core 200 to achieve the purpose of optimizing the installation space of the explosion-proof structure 330, so that the explosion-proof structure 330 is more compatible with the positive tab 210 and the negative tab 220 in terms of performance, and can improve the comprehensive performance of the battery cell 20.

[0088] In some embodiments, please refer to Figure 5 , the distance between the positive tab 210 and the negative tab 220 is L, and L satisfies the relationship:

[0089] L ≥ 5mm.

[0090] The dimensional design of L here should be considered according to the capacity and overall size of the battery cell 20. During the research and development process, it is found that designing L to meet L ≥ 5mm can provide a more effective installation space for other components such as the explosion-proof structure 330 while ensuring the overall performance of the battery cell 20.

[0091] In the above-described embodiments, the configuration among the positive electrode tab 210, the negative electrode tab 220, and the explosion-proof structure 330 is described in more detail with specific dimensional ratio relationships. It should be understood that in other cases, these dimensional ratio relationships can be deformed. In addition, it can be known that the above-mentioned dimensional ratios only represent the possible ranges of the objects they respectively refer to, and do not indicate that there will be incompatibility problems in specific values. Therefore, it can be understood that when the above-listed dimensional relationships are all designed for the same battery cell 20, the values should be taken under the condition of mutual compatibility. For example, when D1 / D0 takes a larger value, correspondingly, other dimensional relationships, such as L, can take a smaller value.

[0092] In some embodiments, please refer to Figure 4 , the end cap structure 300 includes a cover plate 340, and the aforementioned explosion-proof structure 330, the positive electrode post 310, and the negative electrode post 320 are all arranged on the cover plate 340.

[0093] Combined with the foregoing, the cover plate 340 can be made of an insulating material. The explosion-proof structure 330, the positive electrode post 310, and the negative electrode post 320 can be integrally formed with the cover plate 340, or they can be installed on the cover plate 340 by subsequent mechanical connection means. Generally speaking, the positive electrode post 310 and the negative electrode post 320 can protrude from the outer surface of the cover plate 340, and the protruding length can be designed according to actual conditions.

[0094] It can be understood that the shape of the cover plate 340 should be adapted to the shape of the end of the housing 100. For a square battery cell, the cover plate 340 can be designed into a long strip shape. The connection between the cover plate 340 and the housing 100 can be made by means of adhesive or welding, which can effectively control the process flow, reduce costs and assembly difficulties.

[0095] In some embodiments, please refer to Figure 4 , the end cap structure 300 may further include an insulating plate 350. The insulating plate 350 is located inside the cover plate 340, and the cover plate 340 can enclose the insulating plate 350 in the receiving cavity 101 of the housing 100. The setting of the insulating plate 350 can further improve the safety performance of the battery cell 20 and prevent it from short-circuiting. The insulating plate 350 can be made of a plastic with good insulation performance or some other non-metals.

[0096] Furthermore, the end cap structure 300 may further include a positive electrode lead-out piece 360 and a negative electrode lead-out piece 370. The positive electrode lead-out piece 360 is connected to the positive electrode tab 210, and the negative electrode lead-out piece 370 is connected to the negative electrode tab 220. The insulating plate 350 is arranged between the positive electrode lead-out piece 360 and the positive electrode post 310, and the insulating plate 350 is arranged between the negative electrode lead-out piece 370 and the negative electrode post 320.

[0097] Here, by designing the positive electrode lead piece 360 and the negative electrode lead piece 370, a safer electrical connection between the tab and the terminal can be designed. For example, the positive electrode lead piece 360 and the negative electrode lead piece 370 can be designed to just butt against the terminal. However, an insulating plate 350 can be provided between the positive electrode lead piece 360 and the positive terminal 310, and between the negative electrode lead piece 370 and the negative terminal 320. The presence of this insulating plate 350 can further improve the safety performance and prevent the battery cell 20 from short - circuiting.

[0098] The insulating plate 350 can be manufactured in an integrally formed manner or can be designed as a split structure, with each split structure corresponding to the positive electrode lead piece 360 and the negative electrode lead piece 370 respectively.

[0099] The positive electrode lead piece 360 and the negative electrode lead piece 370 can be designed to just cover the corresponding tab structure. For example, the positive electrode lead piece 360 and the negative electrode lead piece 370 are a wrapping body adapted to the size of the tab and can directly cover the tab. In addition, the positive electrode lead piece 360 and the negative electrode lead piece 370 can also be designed to be able to adhere to the tab. For example, they can be a square structure adapted to the size of the tab.

[0100] Figure 8 An exploded view of a pole core provided according to an embodiment of the present application is shown. In some embodiments, please refer to Figure 4 、 Figure 5 and Figure 8 , the pole core 200 includes a positive electrode plate 230, a negative electrode plate 240, and a separator 250. A positive tab 210 is formed at each end of the positive electrode plate 230, and the positive tabs 210 located at both ends of the positive electrode plate 230 are staggeredly arranged in the width direction of the positive electrode plate 230. A negative tab 220 is formed at each end of the negative electrode plate 240, and the negative tabs 220 located at both ends of the negative electrode plate 240 are staggeredly arranged in the width direction of the negative electrode plate 240.

[0101] It can be understood that for the pole core 200, it is formed by stacking the positive electrode plate 230 and the negative electrode plate 240. A separator 250 is provided between every two adjacent positive electrode plates 230 and negative electrode plates 240. The separator 250 has insulating properties and can prevent a short - circuit between the positive electrode plate 230 and the negative electrode plate 240. A current collector is provided on the positive electrode plate 230 and the negative electrode plate 240. The current collector includes active materials and can achieve the collection of current. After stacking a plurality of positive electrode plates 230 and negative electrode plates 240, the pole core 200 in the embodiment of the present application can be formed.

[0102] In addition to the above, each battery cell 20 can be provided with a liquid injection hole 21, which can also penetrate through the cover plate 340 and the insulating plate 350 (for the embodiment configured with the insulating plate 350). Consideration is also given to its proportion in the width direction of the electrode core 200, and the basis for consideration can refer to the explosion-proof structure 330 described above, that is, other components including the explosion-proof structure 330 described above can also include the liquid injection hole 21.

[0103] Different from the aforementioned explosion-proof structure 330, the liquid injection hole 21 can be set at any position on the cover plate 340 and can be used for injecting liquid into the battery cell 20. The liquid injection hole 21 can be one, which can achieve process anti-fooling and facilitate process assembly.

[0104] Figure 9 Fig. shows an explosion schematic diagram of another battery cell provided according to an embodiment of the present application. In some embodiments, please refer to Figure 9 , the liquid injection hole 21 can also be multiple, which can increase the liquid injection rate and the wetting uniformity of the electrolyte on the electrode core 200.

[0105] The explosion-proof structure 330 in the embodiment of the present application can adopt well-known explosion-proof structures 330 in the market, such as various explosion-proof films, etc. In addition, the explosion-proof structure 330 can also be formed by designing weak links on certain structures. For example, the explosion-proof structure 330 can be designed as a circular sheet, the edge area of which is made of a material with higher strength, and the middle area of the circular sheet can be made of a material with lower strength. When the internal temperature of the battery cell 20 is too high, the high-pressure gas can break through the middle area to achieve the purpose of pressure relief.

[0106] Combined with the above description, the embodiment of the present application also provides a battery cell module 10. Please refer to Figure 1 and Figure 2 , the battery cell module 10 includes a plurality of the above-mentioned battery cells 20. The battery cells 20 have a first end 22 and a second end 23, and the plurality of battery cells 20 are stacked so that the first end 22 and the second end 23 can be alternately arranged to form the battery cell module 10.

[0107] It should be noted here that stacking means that the battery cells 20 are attached with their large surfaces, and the plurality of battery cells 20 can be attached with their large surfaces in sequence to form the battery cell module 10.

[0108] Combined with the above description, the first end 22 can be understood as the A end 201 described above, and the second end 23 can be understood as the B end 202 described above. For a certain end of the battery cell module 10, the A end 201 and the B end 202 will appear alternately.

[0109] The battery cell module 10 also includes two ends, which respectively correspond to the A end 201 and the B end 202 of the battery cell 20.

[0110] In the battery cell module 10 in the embodiments of the present application, it includes a plurality of battery cells 20, and the first end portions 22 and the second end portions 23 of the plurality of battery cells 20 are alternately connected to form the battery cell module 10. When the battery cell module 10 is in use, electronic circuits can be formed at both ends thereof, and two electronic circuits can be formed at the two end portions. For a single electronic circuit, the electronic transfer path can be greatly shortened, the impedance can be reduced, and the overcurrent capacity of the battery cell module 10 can be improved. For the two electronic circuits, an alternative solution is provided for the smooth connection of the battery cell module 10, and the long-term stable use of the battery cell module 10 can be ensured.

[0111] In addition to the above overall performance of the battery cell module 10, other performances can be understood by referring to the battery cell 20 in the foregoing text. For example, for the battery cell module 10, all the explosion-proof structures 330 are correspondingly arranged at the end portions in the width direction of the electrode core 200. At this time, a row of explosion-proof structures 330 will be formed on the battery cell module 10, as Figure 1 shown. These explosion-proof structures 330 can be arranged as far as possible from the region where the electrolyte is located. At this time, the explosion-proof valve can be prevented from being corroded by the electrolyte. When the explosion-proof structures 330 are opened for operation, it can also prevent the high-temperature gas from rising and affecting other structures of the battery cell module 10. In addition, the position setting of the explosion-proof structures 330 can also achieve the rapid discharge of gas, and the rapid cooling of the battery cell module 10 can be realized.

[0112] In some embodiments, please refer to Figure 1 and Figure 2 . Any end portion of the battery cell module 10 has at least two groups of pole groups 11, and each pole group 11 is arranged with positive pole columns 310 and negative pole columns 320 alternately. The connecting pieces 12 are connected between two adjacent battery cells 20. Along the thickness direction of the battery cell module 10, the connecting pieces 12 include at least two groups, and each group of connecting pieces 12 is used to connect a group of pole groups 11.

[0113] For any end portion of the battery cell module 10, the plurality of battery cells 20 are arranged in an alternating manner with the A ends 201 and the B ends 202. In other words, for the battery cell module 10, at any end portion thereof, there are two combinations, and these two combinations are composed of positive pole columns 310 and negative pole columns 320 arranged alternately, and the two combinations are arranged in an up-and-down relationship at the end portion of the battery cell module 10 (based on the Figure 2 orientation shown in the attached figure). Correspondingly, two groups of connecting pieces 12 are also provided, and each group of connecting pieces 12 is used to connect a group of pole groups 11.

[0114] Two groups of pole clusters 11 and two groups of connecting pieces 12 are provided at both ends of the battery cell module 10. On the one hand, it can achieve the purpose of shortening the electronic path and reducing energy loss. On the other hand, in the case of short circuit or damage, etc., the extra pole clusters 11 and connecting pieces 12 can be put into use, which can ensure the long-term stable use of the battery cell module 10.

[0115] Under normal circumstances, the connecting piece 12 can be arranged at any end of the battery cell module 10 to ensure that it can be quickly put into use in case of a failure. Of course, in other embodiments, the connecting piece 12 can also be arranged only at one end of the battery cell module 10, and when it is needed to be put into use, the connecting piece 12 is arranged at the other end.

[0116] In the embodiment of the present application, based on the arrangement of the pole cluster 11, the structure of the connecting piece 12 can be simplified. Only designing the connecting piece 12 into a strip shape can meet the use requirements, and can effectively control the manufacturing cost of the battery cell module 10.

[0117] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.

[0118] In the description of the present utility model, it should be understood that the terms "including" and "having" used herein and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products or devices.

[0119] Unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be directly connected, or indirectly connected through an intermediate medium, which can be the connection inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features.

[0120] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery cell (20), characterized in that, Including: A housing (100) having a receiving cavity (101); A pole core (200) disposed in the receiving cavity (101), at least one positive tab (210) and at least one negative tab (220) being formed at each of the two ends of the pole core (200), the positive tabs (210) at the two ends of the pole core (200) being staggeredly arranged in the width direction of the pole core (200), and the negative tabs (220) at the two ends of the pole core (200) being staggeredly arranged in the width direction of the pole core (200); And an end cap structure (300) disposed at the two ends of the pole core (200) and capable of enclosing the pole core (200) within the housing (100), the end cap structure (300) including an explosion-proof structure (330), a positive terminal (310) electrically connected to the positive tab (210), and a negative terminal (320) electrically connected to the negative tab (220), Wherein, in the width direction of the pole core (200), there is a center line (24) that divides the width dimension into two equal parts, the positive tabs (210) and the negative tabs (220) being asymmetrically arranged with respect to the center line (24), and the explosion-proof structure (330) being correspondingly disposed at the ends in the width direction of the pole core (200).

2. The battery cell (20) according to claim 1, characterized in that, The positive tab (210) and the negative tab (220) at the same end of the pole core (200) are respectively disposed on both sides of the center line (24).

3. The battery cell (20) according to claim 1, characterized in that, The edge of one of the positive tab (210) and the negative tab (220) at the same end of the pole core (200) is flush with the center line (24).

4. The battery cell (20) according to claim 1, characterized in that, One of the positive tab (210) and the negative tab (220) at the same end of the pole core (200) is located on one side of the center line (24), and the other is at least partially located on the same side of the center line (24).

5. The battery cell (20) according to claim 1, characterized in that, The positive tab (210) and the negative tab (220) at the same end of the pole core (200) are located on the same side of the center line (24).

6. The battery cell (20) according to any one of claims 1 to 5, characterized in that, The width of the pole core (200) is D0, the width of the positive tab (210) is D1, and the width of the negative tab (220) is D2, and D0, D1, and D2 satisfy the relational expressions: 0.05 ≤ D1 / D0 < 0.42; 0.05 ≤ D2 / D0 < 0.

42.

7. The battery cell (20) according to claim 6, wherein The area for correspondingly installing the explosion-proof structure (330) in the width direction of the pole core (200) is an explosion-proof installation area (205), the edge of the pole core (200) along its width direction forms the first boundary of the explosion-proof installation area (205), and the edge of the positive tab (210) and the negative tab (220) that is close to the first boundary in the width direction forms the second boundary of the explosion-proof installation area (205), the width of the explosion-proof installation area (205) is D3, and D0 and D3 satisfy the relational expression: 0.1D0 ≤ D3 ≤ 0.35D0.

8. The battery cell (20) according to claim 7, characterized in that, The distance between the positive tab (210) and the negative tab (220) is L, and L satisfies the relational expression: L ≥ 5 mm.

9. The battery cell (20) according to claim 1, characterized in that, The end cap structure (300) includes a cover plate (340), and the explosion-proof structure (330), the positive electrode post (310), and the negative electrode post (320) are all disposed on the cover plate (340).

10. The battery cell (20) according to claim 9, characterized in that, At least one liquid injection hole (21) is provided on the cover plate (340).

11. The battery cell (20) according to claim 9, characterized in that, The end cap structure (300) further includes an insulating plate (350), and the insulating plate (350) is located inside the cover plate (340).

12. The battery cell (20) according to claim 11, characterized in that, The end cap structure (300) further includes a positive electrode lead-out piece (360) and a negative electrode lead-out piece. The positive electrode lead-out piece (360) is connected to the positive electrode tab (210), the negative electrode lead-out piece is connected to the negative electrode tab (220), the insulating plate (350) is disposed between the positive electrode lead-out piece (360) and the positive electrode post (310), and the insulating plate (350) is disposed between the negative electrode lead-out piece and the negative electrode post (320).

13. The battery cell (20) according to claim 1, characterized in that, The electrode core (200) includes a positive electrode plate (230), a negative electrode plate (240), and a separator (250). Each of the two ends of the positive electrode plate (230) forms a positive electrode tab (210), and the positive electrode tabs (210) located at the two ends of the positive electrode plate (230) are staggeredly arranged in the width direction of the positive electrode plate (230). Each of the two ends of the negative electrode plate (240) forms a negative electrode tab (220), and the negative electrode tabs (220) located at the two ends of the negative electrode plate (240) are staggeredly arranged in the width direction of the negative electrode plate (240).

14. A battery cell module (10) comprising a plurality of battery cells (20), characterized in that, The battery cell (20) is the battery cell (20) according to any one of claims 1 to 13. The battery cell (20) has a first end portion (22) and a second end portion (23). A plurality of the battery cells (20) are stacked such that the first end portion (22) and the second end portion (23) can be alternately arranged to form the battery cell module (10).

15. The battery cell module (10) according to claim 14, characterized in that, Each end portion of the battery cell module (10) has at least two groups of electrode post groups (11). In each of the electrode post groups (11), the positive electrode post (310) and the negative electrode post (320) are alternately arranged. Adjacent two battery cells (20) are connected by a connecting piece (12). Along the thickness direction of the battery cell module (10), there are at least two groups of the connecting pieces (12), and each group of the connecting pieces (12) is used to connect one group of the electrode post groups (11).

16. The battery cell module (10) according to claim 15, characterized in that, The connecting piece (12) is provided at each end portion of the battery cell module (10).

17. A battery pack, characterized in that, It includes the battery cell module (10) according to any one of claims 14 to 16.

18. An electrical device, characterized in that, It includes the battery pack according to claim 17.

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