Battery cell housing, battery cell and battery pack

Abstract

The application discloses a battery cell shell, a single battery and a battery pack. The battery cell shell comprises a main body, a first limiting piece and a second limiting piece. The first limiting piece and the second limiting piece are respectively arranged on opposite sides of the main body along the width direction of the main body. The first limiting piece can cooperate with the second limiting piece of an adjacent battery cell shell to limit the displacement of the battery cell shell in at least one of the length direction, the height direction and the width direction. The cooperation of the first limiting piece and the second limiting piece can limit the displacement between the battery cell shells, reduce the use of external limiting pieces, and help to reduce the overall volume and the number of components of the battery pack.

Description

Technical Field

[0001] This application relates to the field of power battery technology, and in particular to a cell casing, a single cell, and a battery pack. Background Technology

[0002] In the field of power batteries, multiple individual cells are typically installed inside a cell casing to form a battery pack. To ensure the stable placement of each individual cell, related technologies also include a limiting structure in the battery pack. This limiting structure positions the individual cells in various directions. However, this approach increases both the number of components in the battery pack and its overall size. Summary of the Invention

[0003] This application aims to at least solve one of the technical problems existing in the prior art. To this end, this application proposes a cell housing that can reduce the number of components in a battery pack and reduce the volume of the battery pack.

[0004] This application also proposes single-cell batteries and battery packs using the aforementioned cell casing.

[0005] The cell housing according to the first embodiment of this application: main body; The first limiting member is disposed on one side of the main body along the width direction of the main body; The second limiting member is disposed on the opposite side of the main body along the width direction; The first limiting member can cooperate with the second limiting member of the adjacent cell housing to limit the displacement of the cell housing in at least one of the length direction, height direction and width direction.

[0006] The battery cell casing according to the embodiments of this application has at least the following beneficial effects: The cell casings can be limited by the cooperation of the first and second limiting members, which can reduce the use of external limiting members and help to reduce the overall volume and number of components of the battery pack.

[0007] According to some embodiments of this application, at least one of the first limiting member and the second limiting member extends along the length direction; Along the height direction, the first limiting member and the second limiting member are offset from each other, and the first limiting member can abut against the second limiting member of the adjacent cell housing to limit the displacement of the cell housing along the height direction.

[0008] According to some embodiments of this application, the battery cell housing further includes a third limiting member, which is disposed on the same side of the main body as the first limiting member and can be engaged with the second limiting member of the adjacent battery cell housing to limit the displacement of the battery cell housing along the width direction.

[0009] According to some embodiments of this application, the second limiting member includes a first protrusion and a second protrusion, the first protrusion being disposed on the rear side of the main body, and the second protrusion being disposed on the upper side or lower side of the main body: The third limiting member includes a third connecting part and a third fastening part. The third connecting part is connected to the main body and is capable of elastic movement along the height direction. The third fastening part is connected to the third connecting part. The first limiting member can abut against the first protrusion of the adjacent cell housing, and the third limiting member can engage with the second protrusion of the adjacent cell housing.

[0010] According to some embodiments of this application, at least one of the first limiting member and the second limiting member extends along the length direction; The first limiting member includes a first connecting part and a first fastening part. The first connecting part is connected to the main body, and the first fastening part is connected to the first connecting part. The first fastening part, the first connecting part, and the main body define a first groove. The second limiting member includes a second connecting part and a second fastening part. The second connecting part is connected to the main body, and the second fastening part is connected to the second connecting part. The second fastening part, the second connecting part, and the main body define a second groove. The first fastening part can be inserted into the second groove of the adjacent cell housing. The first groove is used to accommodate the second fastening part of the adjacent cell housing to limit the displacement of the cell housing along the height direction and the width direction.

[0011] According to some embodiments of this application, at least one of the first limiting member and the second limiting member extends along the length direction; The first limiting member includes a fourth connecting part and a fourth fastening part, wherein the fourth connecting part is connected to the main body and the fourth fastening part is connected to the fourth connecting part; The second limiting member has a limiting cavity extending along the length direction and an opening communicating with the limiting cavity. Along the height direction, the maximum size of the fourth fastening part is greater than the maximum size of the opening. The fourth connecting part can pass through the opening of the adjacent cell housing, and the fourth fastening part can be inserted into the limiting cavity of the adjacent cell housing to limit the displacement of the cell housing along the height direction and the width direction.

[0012] According to some embodiments of this application, at least two of the first limiting member and the second limiting member are provided. Along the height direction, at least two of the first limiting members are respectively provided at both ends of the main body, and at least two of the second limiting members are respectively provided at both ends of the main body.

[0013] According to some embodiments of this application, at least one of the first limiting member and the second limiting member extends along the height direction, and the first limiting member and the second limiting member are offset along the length direction. The first limiting member can abut against the second limiting member of the adjacent cell housing to limit the displacement of the cell housing along the length direction.

[0014] The single-cell battery according to the second embodiment of this application includes: The aforementioned battery cell housing; The battery cell is located inside the battery cell housing.

[0015] The battery pack according to the third embodiment of this application includes: Battery casing; The single battery cell is configured in multiple ways, all located within the battery casing, and adjacent single batteries are limited by the cooperation of the first limiting member and the second limiting member.

[0016] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0017] The present application will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a three-dimensional schematic diagram of a single cell in related technologies; Figure 2 This is an exploded view of a battery pack in related technologies; Figure 3 This is a three-dimensional schematic diagram of the battery cell casing in the first embodiment of this application; Figure 4 for Figure 1 Side view of the battery cell casing; Figure 5 To adopt Figure 3 A cross-sectional view of a single battery cell after assembly in the cell housing; Figure 6 for Figure 5 Enlarged view of region A in the middle; Figure 7 This is a schematic diagram of the assembly method of a single battery cell in this application; Figure 8 This is a schematic diagram of another assembly method for a single cell in this application; Figure 9 This is a cross-sectional view of the assembled single battery cell housing according to the second embodiment of this application; Figure 10 for Figure 9 Enlarged view of region B in the middle; Figure 11 for Figure 9 An enlarged schematic diagram of an alternative assembly method for a single cell; Figure 12 for Figure 9 An enlarged schematic diagram of another alternative assembly method for single-cell batteries; Figure 13 This is a cross-sectional view of the assembled single battery cell housing according to the third embodiment of this application; Figure 14 for Figure 13 Enlarged view of region C in the middle; Figure 15 for Figure 13 A cross-sectional view of an alternative assembly method for a single cell; Figure 16 for Figure 15 Enlarged schematic diagram of region D in the middle; Figure 17 for Figure 13 A cross-sectional view of an alternative assembly method for a single cell. Figure 18 for Figure 17 Enlarged schematic diagram of region E in the middle; Figure 19 for Figure 13 An enlarged schematic diagram of another alternative assembly method for single-cell batteries; Figure 20 for Figure 13 An enlarged schematic diagram of another alternative assembly method for single-cell batteries; Figure 21 This is a perspective view of the battery cell housing in the fourth embodiment of this application; Figure 22 To adopt Figure 21 A top view of the assembled individual battery cells in the cell housing.

[0018] Figure label: Cell casing 100; Main body 110, front side 111, rear side 112, upper side 113; First limiting member 120, first connecting part 121, first fastening part 122, first groove 123, fourth connecting part 124, fourth fastening part 125; Second limiting member 130, first protrusion 131, second protrusion 132, second connecting part 133, second fastening part 134, second groove 135, limiting cavity 136, opening 137; Third limiting member 140, third connecting part 141, third fastening part 142; Battery pack 200; Lateral limiting component 210; Top limiting component 220. Detailed Implementation

[0019] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0020] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0021] In the description of this application, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0022] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0023] In the description of this application, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0024] This application applies to single-cell batteries with a large length-to-thickness ratio. A typical structure of this type of single-cell battery is as follows: Figure 1 As shown, it is a rectangular prism, and its length dimension (e.g.) Figure 1 The dimension in the left-right direction is greater than the dimension in the height direction (e.g.) Figure 1 The dimensions in the vertical direction are much larger than the dimensions in the width direction (e.g., the dimensions in the vertical direction). Figure 1 The dimensions in the front and back directions are considered, resulting in an overall elongated shape.

[0025] The common way to combine the above-mentioned individual cells into a battery pack 200 is as follows: Figure 2 As shown, since the width of a single battery cell is the smallest, multiple single batteries are arranged along the width direction. As can be seen from the diagram, except for the downward direction (where the single battery cell remains in contact with the bottom support structure under gravity), the single batteries are not constrained in other directions. To achieve stable placement of each single battery cell, it is necessary to limit their movement from above, left, right, front, and rear. A common method in related technologies is to use external limiting components. For example, lateral limiting components 210 are used on the sides of the single battery cell to limit its movement to the left, right, front, and rear, while top limiting components 220 are used to limit its movement from above. Obviously, external limiting components not only increase the volume of the entire battery pack 200 but also increase the number of components, thus increasing costs.

[0026] Based on the above, this application provides a cell housing 100 that achieves inter-housing positioning through its own limiting structure, reducing the use of external limiting components and helping to reduce the overall volume and number of components of the battery pack 200. (Refer to...) Figure 3 , Figure 4 The battery cell housing 100 in this embodiment includes a main body 110, a first limiting member 120 and a second limiting member 130. The main body 110 is used to accommodate the internal structure of the battery, such as the battery cell. The first limiting member 120 and the second limiting member 130 are both connected to the main body 110 to limit the position of the batteries.

[0027] Taking the illustration as an example, the main body 110 is a rectangular shell with an internal cavity for accommodating the battery cell. The main body 110 has a long strip structure, meaning its length is much greater than its width. Openings are formed at both ends of the main body 110. The first limiting member 120 and the second limiting member 130 are arranged opposite each other, specifically along the width direction of the battery cell shell 100. The first limiting member 120 is located on one side of the main body 110 (e.g., Figure 3 The front side 111), and the second limiting member 130 are provided on the other side of the main body 110 (e.g., the front side 111), the second limiting member 130 is ... Figure 3 The rear side 112 of the main body 110 is a long strip structure. Therefore, the area of ​​its side side in the width direction (such as the front side 111 and the rear side 112 in the figure) is much larger than the area of ​​the side side in other directions. This provides enough space for the setting of the limiting member. At the same time, setting the limiting member on both sides in the width direction can also adapt to the layout of the single battery cells arranged along the width direction.

[0028] It should be noted that the terms "one side" and "the other side" used in this application are only to indicate the relative positional relationship between the first limiting member 120 and the second limiting member 130, and do not restrict the first limiting member 120 from being completely located on the front side 111 of the main body 110, or the second limiting member 130 from being completely located on the rear side 112 of the main body 110. Depending on the limiting method, the limiting members may extend to or be completely located on other adjacent sides. For example, a part of the second limiting member 130 may be located on the rear side 112, and the other end may be located on the upper side 113. The specific form will be described below in conjunction with the accompanying drawings and specific embodiments.

[0029] Adjacent cell housings 100 are mutually restrained by limiting members. Taking three adjacent cell housings 100 arranged along the width direction as an example, the first limiting member 120 of the middle cell housing 100 cooperates with the second limiting member 130 of the front cell housing 100, and the second limiting member 130 of the middle cell housing 100 cooperates with the first limiting member 120 of the rear cell housing 100. Based on the above limiting relationship, the limiting members can restrict the displacement of the cell housing 100 in at least one of the length, height, and width directions. It should be noted that the above-mentioned length, height, and width directions each include two specific directions. The limiting of the length, height, or width direction mentioned in this application may include the case of limiting only one specific direction. Taking the height direction as an example, it includes the vertically upward direction and the vertically downward direction (e.g., Figure 6As shown in the diagram, the limiting component's height-direction limiting can be interpreted as limiting only the upward direction. It is understandable that as long as the limiting component can restrict displacement in a specific direction, the external limiting structure in that direction can be eliminated, thereby achieving the goal of reducing volume and simplifying the structure. Of course, the more directions the limiting component can restrict, the more external limiting structures can be eliminated, and the more significant the effect of reducing volume and the number of components.

[0030] Based on the above, the cell casing 100 can be provided with at least one first limiting member 120 and one second limiting member 130 to at least limit displacement in a specific direction. Of course, to balance the force and enhance the limiting effect, the number of limiting members is usually increased. Figure 3 As shown in the example, the front side 111 of the main body 110 is provided with two first limiting members 120, and the rear side 112 is provided with two second limiting members 130. The two first limiting members 120 and the two second limiting members 130 cooperate to completely restrict displacement in the height direction. It should be noted that the number of first limiting members 120 and second limiting members 130 can also be adjusted as needed. For example, the battery cell housing 100 can be provided with more than three first limiting members 120 and second limiting members 130.

[0031] Furthermore, as a specific arrangement of the aforementioned limiting members, at least one of the first limiting member 120 and the second limiting member 130 extends along the length direction of the cell housing 100. Since the cell housing 100 has a large dimension along its length, it is prone to deformation in that direction. The limiting member extending along the length direction can serve as a reinforcing structure for the main body 110, strengthening the rigidity of the cell housing 100 in the length direction and reducing deformation. Specific arrangements of the limiting members include, but are not limited to, the following combinations: a. The first limiting member 120 extends continuously along the aforementioned length direction and has a long extension distance, while the second limiting member 130 has a smaller dimension along its length direction; b. Both the first limiting member 120 and the second limiting member 130 extend continuously along the aforementioned length direction; c. The first limiting member 120 includes multiple sub-limiting members spaced apart along the aforementioned length direction. In particular, a preferred arrangement is that both the first limiting member 120 and the second limiting member 130 extend continuously along the aforementioned length direction, and their lengths are equal to the length of the main body 110, thereby further increasing the strength of the main body 110. The battery cell housing 100 can also be integrally formed by extrusion molding, without the need for separate processing of the limiting members, which helps to simplify the molding process. In addition, since the limiting members extend to the ends of the main body 110 in both the left and right directions, adjacent battery cell housings 100 can be connected from either the left or right end, making assembly more convenient.

[0032] In general, this application uses limiting members on the cell housing 100 to mutually limit each other, thereby reducing the use of external limiting structures. The following will be described in conjunction with various specific embodiments.

[0033] First Embodiment Reference Figures 3 to 6 The diagram shows a schematic of a single cell housing 100 and a schematic of a single cell battery using the cell housing arranged along the width direction. There are two first limiting members 120, both located on the front side of the main body 110 and arranged sequentially along the height direction of the cell housing 100. There are also two second limiting members 130, located on the rear side of the main body 110 and arranged sequentially along the height direction of the cell housing 100.

[0034] Along the height direction of the cell casing 100, the first limiting member 120 and the corresponding second limiting member 130 are offset, as shown in the figure below. Figure 4 As shown, the minimum distance H1 between the two second limiting members 130 along the height direction is equal to or slightly greater than the maximum distance H2 between the two first limiting members 120. Thus, when two adjacent cell housings 100 pass through... Figure 6 When the two battery cell housings 100 are engaged in the manner shown, the upper side of the upper first limiting member 120 abuts against the lower side of the upper second limiting member 130. Similarly, the lower side of the lower first limiting member 120 abuts against the upper side of the upper second limiting member 130, thereby limiting the two battery cell housings 100 to each other and preventing displacement in the height direction (including upward and downward directions). Of course, since the first limiting member 120 and the corresponding second limiting member 130 are misaligned, when the first limiting member 120 restricts upward displacement, the second limiting member 130 will restrict downward displacement, and vice versa. Therefore, in the alternative embodiment, only one first limiting member 120 and one second limiting member 130 can be set to achieve complete limiting of the cell housing 100 in the height direction. In addition, since the first limiting member 120 can abut against the rear side 112 of the adjacent cell housing 100 and the second limiting member 130 can abut against the front side 111 of the adjacent cell housing 100, the adjacent cell housing 100 can no longer approach each other after approaching a certain distance in the width direction (but can freely separate from each other in the width direction). That is, this embodiment can also achieve incomplete limiting in the width direction.

[0035] In this embodiment, both the first limiting member 120 and the second limiting member 130 have rectangular cross-sections, so their contact area is planar, which helps to ensure a certain contact area and thus ensure the limiting effect. Both limiting members extend continuously along the length direction, and their lengths are equal to the length of the main body 110. Thus, this embodiment provides two assembly methods: one is to fix one battery cell housing 100, and then install the other battery cell housing 100 along the length direction (…). Figure 7Move the two cells in the direction of the middle arrow until they are aligned; the second is to fix one cell housing 100 and then move the other cell housing 100 along the width direction (in the direction of the middle arrow). Figure 8 Move the two (in the direction of the middle arrow) until they are in contact, which can shorten the moving distance of the cell housing 100.

[0036] Furthermore, as shown in the figure, due to the presence of the limiting member, a gap is generated between adjacent cell housings 100. This gap can serve as space for the expansion and deformation of a single cell. That is, in this embodiment, the limiting member integrated into the cell housing 100 acts as a separator between individual cells. Compared to the related art's method of separating individual cells using separate separators, this further simplifies the number of components in the battery pack and reduces the workload of assembling the separators. In addition, to better avoid deformed portions of the individual cells, the limiting member is provided at the end of the main body 110 along the height direction.

[0037] Second Embodiment The limiting member in the first embodiment can only achieve limiting in the height direction and incomplete limiting in the width direction. This embodiment is an improvement on the first embodiment, achieving complete limiting in the height direction and also complete limiting in the width direction. (Refer to...) Figure 9 and Figure 10 The main body 110 and the first limiting member 120 of the cell housing 100 are the same as in the first embodiment, and will not be described in detail here. The difference between this embodiment and the first embodiment includes: a third limiting member 140 is also provided. The third limiting member 140 and the first limiting member 120 are provided on the same side of the main body 110. The third limiting member 140 can be engaged with the second limiting member 130 of the adjacent cell housing 100 to restrict the cell housings 100 from moving away from each other in the width direction.

[0038] As a specific implementation of this embodiment, the second limiting member 130 includes a first protrusion 131 and a second protrusion 132 integrally connected. The first protrusion 131 and the second protrusion 132 are located on two adjacent sides of the main body 110 (that is, the limiting member is not limited to one side). Figure 10Taking the second limiting member 130 in the upper middle as an example, the first protrusion 131 is disposed on the rear side 112 of the main body 110 and has a first limiting surface parallel to the upper side 113. The second protrusion 132 is disposed on the upper side 113 of the main body 110 and has a second limiting surface parallel to the rear side 112. The first limiting member 120 is located on the front side 111, and the third limiting member 140 is located on the upper side 113. The third limiting member 140 includes a third connecting part 141 and a third fastening part 142. One end of the third connecting part 141 is connected to the front side 111, and the other end extends away from the main body 110. The third fastening part 142 is connected to the distal end of the third connecting part 141. When engaged, the upper side of the first limiting member 120 abuts against the first limiting surface of the first protrusion 131 on the adjacent cell housing 100 to achieve height-direction limiting. The third fastening part 142 of the third limiting member 140 fastens to the second limiting surface of the second protrusion 132 on the adjacent cell housing 100. The engaging limiting members abut against the front side 111 or rear side 112 of the adjacent housing, so that the cell housings 100 can neither approach each other nor move away from each other in the width direction, thereby achieving complete width-direction limiting.

[0039] It should be noted that, in order to achieve a better snap-fit ​​effect, both the third connecting part 141 and the third fastening part 142 of the third limiting member 140 need to maintain a certain length. If the fastening part is located between adjacent cell housings 100, it may increase the gap between adjacent cell housings 100 (e.g., Figure 11 As shown), this increases the overall volume of the battery pack. However, in this embodiment, since the second protrusion 132 is located on the upper side 113 of the main body 110, the gap between adjacent cell housings 100 is not affected by the length of the third limiting member 140 and the second protrusion 132. Therefore, while ensuring sufficient battery deformation space, the gap width between cell housings 100 can be reduced. Of course, the above description does not mean that this application excludes the solution of setting the fastening part of the third fastening part 142 and the second protrusion 132 between adjacent cell housings 100, for example... Figure 11 As shown, the second limiting member 130 can be completely located on the rear side 112, and the third limiting member 140 can be completely located on the front side 111.

[0040] The first limiting member 120, the second limiting member 130, and the third limiting member 140 all extend along the length direction of the main body 110, and their lengths are all equal to the length of the main body 110. Therefore, it is possible to use... Figure 7Assembly is performed in this manner. It is understood that, since this embodiment uses a separate third limiting member 140 to limit the first limiting member 120, the third limiting member 140 does not need to bear the force in the height direction, and the third limiting member 140 is a cantilever structure. Therefore, the third connecting part 141 can be set as an elastic member that can deform to a certain extent along the height direction. Thus, this embodiment can also employ... Figure 8 The assembly is performed in the manner shown, whereby the third connecting part 141 deforms as the third fastening part 142 passes over the second protrusion 132, and the third connecting part 141 resets after the third fastening part 142 has completely passed over the second protrusion 132, thus realizing the fastening action of the third fastening part 142. Based on the above, this embodiment has the following effects: it can achieve complete limiting in the width and height directions, and has a good overall limiting effect; it can minimize the gap between adjacent cell housings 100, thereby reducing the overall volume of the battery pack; and it can be assembled along the width direction, making assembly convenient.

[0041] In order to facilitate the third fastening part 142 to pass over the second protrusion 132, both the second protrusion 132 and the third fastening part 142 are provided with arc surfaces or bevels.

[0042] As another specific implementation of this embodiment, refer to Figure 12 The first protrusion 131 and the second protrusion 132 can be two independent structures.

[0043] Third Embodiment In this embodiment, the first limiting member 120 can be fastened to the second limiting member 130 of the adjacent cell housing 100. Compared with the first embodiment, the fastening relationship between the two can limit the displacement of the cell housing 100 in the height and width directions. Compared with the second embodiment, there is no need to set the third limiting member 140.

[0044] As one specific implementation method of this embodiment, refer to Figure 13 , Figure 14 The first limiting member 120 includes a first connecting portion 121 and a first fastening portion 122. One end of the first connecting portion 121 is connected to the front side 111 of the main body 110, and the other end extends away from the main body 110. The first fastening portion 122 is connected to the distal end of the first connecting portion 121. The first fastening portion 122, the first connecting portion 121, and the main body 110 define a first groove 123. Similarly, the second limiting member 130 includes a second connecting portion 133 and a second fastening portion 134. One end of the second connecting portion 133 is connected to the rear side 112 of the main body 110, and the other end extends away from the main body 110. The second fastening portion 134 is connected to the distal end of the second connecting portion 133. The second fastening portion 134, the second connecting portion 133, and the main body 110 define a second groove 135. When engaged, the first limiting member 120 and the second limiting member 130 of adjacent cell housings 100 interlock. Specifically, taking three adjacent cell housings 100 as an example, the first interlocking part 122 of the middle cell housing 100 is inserted into the second groove 135 of the front cell housing 100, and the second interlocking part 134 of the middle cell housing 100 is inserted into the first groove 123 of the rear cell housing 100. In this way, complete limiting in both the height and width directions can be achieved simultaneously. Since the limiting member in this embodiment needs to withstand forces in both the width and height directions, it is a rigid structure that is not easily deformed, and is typically made of... Figure 7 Assembly according to the method shown.

[0045] As another specific implementation method of this embodiment, refer to Figure 15 , Figure 16 The first limiting member 120 can be adopted Figure 10 The third limiting member 140 has a structure, and the second limiting member 130 can also adopt the same structure. Figure 10 The structure in the middle, that is, the complete limitation in the height direction and the width direction is achieved by the fastening of the second protrusion 132 on the first limiting member 120 and the second limiting member 130. The specific structure and cooperation relationship are detailed in the second embodiment, and will not be repeated here.

[0046] It is understandable that the assembly method of this embodiment can be adjusted according to the different stress conditions of the individual battery cells during use. Specifically, if the individual battery cells will be subjected to a small force along the height direction during use, the first limiting member 120 can adopt an elastic structure similar to the third limiting member 140, thereby enabling simultaneous... Figure 7 and Figure 8 As shown, the assembly is performed as follows; if the individual battery cells will experience significant forces along the height direction during use, the first limiting member 120 can be reinforced (e.g., thickened) to make it a rigid structure, thus allowing for the use of... Figure 7 Assemble as shown.

[0047] As another specific implementation method of this embodiment, refer to Figure 17 , Figure 18 The first limiting member 120 in this embodiment includes a fourth connecting part 124 and a fourth fastening part 125. One end of the fourth connecting part 124 is connected to the front side 111 of the main body 110, and the other end extends away from the main body 110. The fourth fastening part 125 is connected to the far end of the fourth connecting part 124.

[0048] The second limiting member 130 is connected to the rear side 112 of the main body 110 and has a limiting cavity 136 and an opening 137. The limiting cavity 136 extends through the second limiting member 130 along its length, thereby forming entrances for the first limiting member 120 to enter at both ends of the second limiting member 130. The opening 137 communicates with the limiting cavity 136 and is located at the end of the second limiting member 130 away from the main body 110. Along the height direction, the following size relationships exist: the maximum height of the fourth fastening part 125 is greater than the maximum height of the fourth connecting part 124; the maximum height of the limiting cavity 136 is greater than the maximum height of the opening 137; and the maximum height of the fourth connecting part 124 is less than the maximum height of the opening 137. The maximum height of the fourth fastening part 125 is less than the maximum height of the limiting cavity 136 but greater than the maximum height of the opening 137.

[0049] During assembly, the first limiting member 120 slides into the second limiting member 130 from the left or right end of the adjacent cell housing 100, so that the fourth connecting part 124 passes through the opening 137 of the adjacent second limiting member 130, and the fourth fastening part 125 is located in the limiting cavity 136 of the adjacent second limiting member 130. Since the maximum height of the fourth fastening part 125 is greater than the maximum height of the opening 137, due to the abutment of the cavity wall of the limiting cavity 136, the fourth fastening part 125 cannot disengage from the limiting cavity 136 along the height and width directions, thus limiting the displacement of the cell housing 100 along the height and width directions. Figure 14 Compared to the scheme shown, this embodiment has more limiting surfaces, which can provide a better limiting effect.

[0050] In this embodiment, both ends of the fourth fastening portion 125 extend beyond the fourth connecting portion 124 along the height direction. It is understood that the fourth fastening portion 125 may also extend beyond the fourth connecting portion 124 at only one end, for example... Figure 19 As shown, the cross-sectional shape of the fourth fastening part 125 is not limited to a rectangle; for example, it can be... Figure 20 The aforementioned circular shape, etc.

[0051] It should be noted that although the above embodiments are all described based on the premise that the limiting member extends along the length direction, this application is not limited thereto. Figure 21 , Figure 22 For example, both the first limiting member 120 and the second limiting member 130 extend along the height. Along the length direction, the first limiting member 120 and the second limiting member 130 are offset, and their shape and mating method are similar to... Figure 6 Similar to the scheme shown, after assembly in this embodiment, the first limiting member 120 and the second limiting member 130 of adjacent cell housings 100 abut against each other, thereby limiting the displacement of the cell housing 100 in the length direction. It is understood that, based on the limiting member extending along the height direction, adjusting the structure of the limiting member can achieve different limiting effects. For example, when the limiting member adopts... Figure 14 The structure shown enables the cell housing 100 to be limited along both the length and width directions.

[0052] This application also provides a single-cell battery, which includes a cell, an end cap, and a cell housing 100 as described in the above embodiments. The cell is installed within the cell housing 100 and encapsulated by the end cap. Both the cell and the end cap can employ known technologies, which will not be described in detail here.

[0053] This application also provides a battery pack, which includes a battery casing and the aforementioned individual cells, wherein multiple individual cells are positioned relative to each other by limiting members, and then installed inside the battery casing. Figure 2 Compared to the scheme shown, the battery pack provided in this application can eliminate at least some of the external limiting components, thereby achieving the effect of reducing volume and simplifying structure. In particular, when the cell casing 100 adopts... Figures 10 to 20 In this approach, only the displacement in the length direction between individual cells is not restricted. In this case, an adhesive can be applied to the lower surface of the individual cell to connect it to the battery casing. That is, the displacement in the length direction of the individual cell is restricted by the adhesive. In this way, external limiting components can be completely eliminated, further improving the effect of reducing volume and simplifying structure.

[0054] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application. Furthermore, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other.

Claims

1. A battery cell casing, characterized in that, include: The main body is configured as a rectangular shell, wherein the length dimension of the main body is greater than the height dimension and the width dimension; The first limiting member is disposed on one side of the main body along the width direction of the main body; The second limiting member is disposed on the opposite side of the main body along the width direction; The second limiting member includes a first protrusion and a second protrusion. The first protrusion is disposed on the rear side of the main body, and the second protrusion is disposed on the upper or lower side of the main body. The battery cell housing also includes a third limiting member disposed on the same side of the main body as the first limiting member. The third limiting member includes a third connecting part and a third fastening part. One end of the third connecting part is connected to the front side of the main body, and the other end extends away from the main body, enabling elastic movement along the height direction. The third fastening part is connected to the distal end of the third connecting part. The first limiting member can abut against the first protrusion of the adjacent cell housing to limit the displacement of the cell housing in the height direction, and the third fastening part can fasten to the second protrusion of the adjacent cell housing to limit the displacement of the cell housing in the width direction.

2. The cell housing according to claim 1, characterized in that, At least one of the first limiting member and the second limiting member extends along the length direction; Along the height direction, the first limiting member is offset from the first protrusion.

3. The cell housing according to claim 1, characterized in that, Both the first limiting member and the second limiting member are provided in at least two. Along the height direction, at least two of the first limiting members are respectively provided at both ends of the main body, and at least two of the second limiting members are respectively provided at both ends of the main body.

4. A single-cell battery, characterized in that, include: The cell housing according to any one of claims 1 to 3; The battery cell is located inside the battery cell housing.

5. A battery pack, characterized in that, include: Battery casing; The single-cell battery of claim 4 is provided in multiple configurations, all located within the battery casing, and adjacent single-cell batteries are positioned by the cooperation of the first limiting member and the second limiting member.

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