Single battery and battery pack

Abstract

The utility model relates to the technical field of batteries, and particularly discloses a single battery and a battery pack. The single battery comprises a shell with a containing cavity, an electrode assembly and a top cover covering the shell to seal the containing cavity, and the electrode assembly is arranged in the containing cavity. Wherein the shell comprises a support and a light-transmitting plate, the support and the light-transmitting plate define a containing cavity, the support is provided with a side plate, the side plate is provided with a hollowed-out part communicated with the containing cavity, and the light-transmitting plate is connected with the side plate to seal the hollowed-out part; a clamping part is arranged on the edge, facing the hollow part, of at least one of the light-transmitting plate and the side plate, the clamping part is provided with clamping surfaces arranged on the two sides of the side plate in the thickness direction, and at least part of the other one is clamped with the clamping part to limit the mutual position between the light-transmitting plate and the side plate. According to the scheme, the connection strength between the light-transmitting plate and the side plate is ensured while the internal condition of the shell is visually observed, so that the reliability of the single battery is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular to a single cell and a battery pack. Background Art

[0002] A single cell generally includes a housing, an electrode assembly disposed within the housing, and a top cover. In the process of manufacturing a single cell, the electrolyte injection process is a relatively important step.

[0003] The shell of a conventional single cell battery is an opaque metal shell. During the electrolyte injection process, workers cannot intuitively know the specific conditions inside the shell. Therefore, they cannot accurately control the injection volume, electrolyte infiltration conditions, etc., which affects the processing accuracy and product quality.

[0004] In some technologies, a transparent window is provided on the housing for easy observation, but the stability and reliability of the connection between the transparent window and the housing has always been a critical and difficult problem to solve.

[0005] Application Contents

[0006] The present application provides a single cell and a battery pack to solve the technical problem that a transparent window is currently provided on a shell, resulting in an unstable and unreliable shell structure.

[0007] The present application provides a single cell battery having a first direction and a second direction intersecting with each other, and the single cell battery includes: a shell having a accommodating cavity; an electrode assembly arranged in the accommodating cavity; a top cover, which is covered on the shell along the first direction to close the accommodating cavity; wherein, the shell includes a bracket and a light-transmitting plate, the bracket and the light-transmitting plate enclose a accommodating cavity, the bracket has a side plate extending along the first direction, the light-transmitting plate has a second direction intersecting with the first direction, the side plate is provided with a hollow portion passing through along the second direction and communicating with the accommodating cavity, and the light-transmitting plate is connected to the side plate to close the hollow portion; wherein, at least one of the light-transmitting plate and the side plate is provided with a clamping portion toward the edge of the hollow portion, the clamping portion has clamping surfaces respectively arranged on both sides of the side plate in the second direction, and at least a portion of the other is clamped with the clamping portion to limit the position of the light-transmitting plate in the second direction.

[0008] By implementing the above technical solution, the conditions inside the housing can be directly observed through the light-transmitting plate, such as the liquid level after electrolyte injection, the infiltration condition of the electrode assembly, etc., thereby facilitating the staff to intuitively and quickly understand the conditions inside the housing, and providing a basis for quick and accurate judgment for subsequent processing. In addition, in this solution, by providing a snap-fitting engagement between a snap-fitting portion provided on one of the light-transmitting plate or the side panel and the other, the position of the light-transmitting plate in the second direction is limited, thereby improving the connection strength between the light-transmitting plate and the side panel. While realizing the separate design of the light-transmitting plate and the bracket to be assembled into the housing, the reliability of the housing can also be ensured. In addition, the snap-fitting engagement of the snap-fitting portion can reduce the welding workload, improve processing efficiency, and also facilitate the flexible selection of the light-transmitting plate material.

[0009] As an optional embodiment of the solution of the present application, the light-transmitting plate has a circumferential direction intersecting with the second direction, and the clamping portion is arranged around the outer peripheral side of the light-transmitting plate along the circumferential direction.

[0010] To implement the above technical solution, the clamping portion is arranged on the light-transmitting plate, and the clamping portion is an integral structure that is continuous along the circumferential direction, which enables the side panels located on the circumferential side of the hollow portion to fully engage with the clamping portion, further improving the stability of the connection between the light-transmitting plate and the bracket, thereby ensuring the reliability of the shell.

[0011] As an optional embodiment of the present application, the hollow portion has an inner wall surface along the circumferential direction; the light-transmitting plate includes a main body and a clamping portion, the main body has an outer peripheral surface, the outer peripheral surface is arranged opposite to the inner wall surface, the main body is arranged in the hollow portion, and the clamping portion is protruded on the outer peripheral surface; the clamping portion includes a first clamping protrusion and a second clamping protrusion, and the first clamping protrusion and the second clamping protrusion are both arranged around along the circumferential direction; wherein, the first clamping protrusion and the second clamping protrusion are respectively arranged on both sides of the side plate in the second direction, and the surfaces of the first clamping protrusion and the second clamping protrusion facing the side plate both constitute clamping surfaces.

[0012] As an optional embodiment of the present application, the light-transmitting plate has a circumferential direction intersecting with the second direction, and the light-transmitting plate includes a main body portion and a clamping portion that are interconnected; the main body portion has an outer peripheral surface, and the hollow portion has an inner wall surface along the circumferential direction, the outer peripheral surface and the inner wall surface are arranged opposite to each other, and the main body portion is arranged in the hollow portion; the clamping portion includes a first limiting protrusion and a second limiting protrusion, both of which are arranged on the outer peripheral surface, at least one first limiting protrusion and / or second limiting protrusion is provided and extends along the circumferential direction, and the first limiting protrusion and / or second limiting protrusion are arranged intermittently between the head and tail. The first limiting protrusion and the second limiting protrusion are respectively arranged on both sides of the side plate in the second direction, and the surfaces of the first limiting protrusion and the second limiting protrusion facing the side plate constitute the clamping surface.

[0013] As an optional embodiment of the present application, it also includes a stabilizing member, which is arranged on the side panel. The stabilizing member includes a fixing part passing through the side panel and a limiting part connected to the fixing part. A limited space is set between the limiting part and the side panel, and the edge of the light-transmitting plate is partially clamped in the limiting space.

[0014] By implementing the above technical solution, the limiting portion can further limit the light-transmitting plate in the second direction, thereby further improving the connection firmness between the light-transmitting plate and the bracket, and improving the reliability of the housing while achieving separate snap-fit ​​assembly of the light-transmitting plate and the bracket.

[0015] As an optional embodiment of the solution of the present application, a fixing hole extending along the second direction is opened on the side panel, and the fixing part is passed through the fixing hole.

[0016] As an optional embodiment of the solution of the present application, along the second direction, the projection of the light-transmitting plate on the side plate partially overlaps with the area defined by the fixing hole, and the fixing portion is fixedly connected to the light-transmitting plate.

[0017] To implement the above technical solution, the fixing part is fixed in the fixing hole to achieve a firm connection between the fixing part and the side panel, and at the same time the fixing part is fixedly connected to the light-transmitting plate. Therefore, the light-transmitting plate and the side panel are further stably connected by the fixing part as an intermediate connecting piece, thereby improving the overall structural stability of the shell.

[0018] As an optional embodiment of the present application, a plurality of stabilizing members are provided along the circumference of the hollow portion.

[0019] As an optional embodiment of the solution of the present application, a sealing layer is further included, and the sealing layer is arranged at the contact position between the edge of the light-transmitting plate and the side plate.

[0020] By implementing the above technical solution, the sealing layer ensures the sealing performance of the connection between the light-transmitting plate and the side plate, thereby ensuring the reliability of the housing.

[0021] The present application also discloses a battery pack, comprising:

[0022] The box body has a receiving cavity; and the above-mentioned single battery is accommodated in the receiving cavity.

[0023] One of the above technical solutions has the following advantages or beneficial effects:

[0024] By providing a snap-fitting engagement between a snap-fitting portion on one of the light-transmitting panel or the side panel and the other, the position of the light-transmitting panel in the second direction is defined, thereby improving the connection strength between the light-transmitting panel and the side panel. This allows the light-transmitting panel and the bracket to be assembled into a separate housing while also ensuring the reliability and structural strength of the housing. Furthermore, the snap-fitting engagement of the snap-fitting portion reduces welding workload, improves processing efficiency, and facilitates flexible selection of light-transmitting panel materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The following detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings will make the technical solutions and other beneficial effects of the present application apparent.

[0026] Figure 1 This is an overall structural diagram of a single cell provided in an embodiment of the present application;

[0027] Figure 2 This is an overall exploded structural diagram of a single cell provided in an embodiment of the present application;

[0028] Figure 3 This is a cross-sectional view provided in an embodiment of the present application for illustrating the connection structure between the light-transmitting plate and the bracket;

[0029] Figure 4 This embodiment of the present application provides Figure 3 A partial enlarged view of part A;

[0030] Figure 5 This is an overall schematic diagram for illustrating the structure of a light-transmitting plate provided in an embodiment of the present application;

[0031] Figure 6 is a cross-sectional view provided in an embodiment of the present application for illustrating the structure of a light-transmitting plate;

[0032] Figure 7 This embodiment of the present application provides Figure 5 A partial enlarged view of part B;

[0033] Figure 8 is a schematic diagram of a light-transmitting plate structure in another embodiment of the present application;

[0034] Figure 9 is a schematic diagram of a light-transmitting plate structure in another embodiment of the present application;

[0035] Figure 10 is a schematic diagram provided in an embodiment of the present application for illustrating the structure of a stabilizing member;

[0036] Figure 11 This is a partial cross-sectional view provided in an embodiment of the present application for illustrating the connection structure between the light-transmitting plate and the bracket;

[0037] Figure 12 This is a schematic diagram provided in an embodiment of the present application for illustrating a first processing method of a housing;

[0038] Figure 13 This is a schematic diagram provided in an embodiment of the present application for demonstrating two processing methods for the shell.

[0039] Reference numerals: 1, housing; 10, accommodating cavity;

[0040] 11. Bracket; 111. Side panel; 1110. Fixing hole; 112. Hollow portion; 1121. Inner wall surface;

[0041] 12. Light-transmitting plate; 120. Clamping portion; 1200. Clamping surface; 121. Main body; 1211. Outer peripheral surface; 122. First clamping protrusion; 123. Second clamping protrusion;

[0042] 1201, first limiting protrusion; 1202, second limiting protrusion;

[0043] 2. Electrode assembly; 3. Top cover;

[0044] 4. Stabilizing member; 41. Fixing portion; 42. Limiting portion; 40. Limiting space; 5. Sealing layer;

[0045] Z, first direction; X, second direction; Y, circumferential direction;

[0046] 500, mold; 501, left mold; 502, right mold; 601, first part; 602, second part; 60, welding part. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0048] In the description of this application, it should be noted that, unless otherwise specified or limited, the term "and / or" herein is merely a description of an association relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, and B exists alone. Furthermore, the character " / " herein, unless otherwise specified, generally indicates that the associated objects are in an "or" relationship.

[0049] The following is combined with Figure 1-13 This application is further described.

[0050] Reference Figure 1 and Figure 2, is a single cell provided in the present application, wherein the single cell has a first direction Z and a second direction X intersecting each other. The single cell includes a housing 1, an electrode assembly 2, and a top cover 3. The housing 1 is square and includes a square bracket 11 and a light-transmitting plate 12 disposed on the bracket 11. An open accommodating cavity 10 is formed within the bracket 11. The top cover 3 is disposed on the open accommodating cavity 10 along the first direction Z to seal the accommodating cavity 10. The electrode assembly 2 is disposed within the accommodating cavity 10. In an optional example, the housing 1 can also be configured in other shapes such as a circle.

[0051] The electrode assembly 2 is disposed within the accommodating chamber 10 and includes a bare cell, which primarily reacts electrochemically with the electrolyte within the accommodating chamber 10 to achieve chemical energy to electrical energy conversion. The bare cell includes a positive electrode sheet, a negative electrode sheet, and a separator, formed by processes such as winding or lamination. In one example, the electrode assembly 2 may further include a structure such as a transition piece, which is used to connect the positive and negative electrodes of the bare cell to the poles of the top cover 3.

[0052] Reference Figure 3 and Figure 4 The bracket 11 is arranged in a square shape and has a side panel 111 extending along a first direction Z. The light-transmitting plate 12 has a second direction X intersecting the first direction Z. The side panel 111 is provided with a hollow portion 112 extending along the second direction X and communicating with the accommodating cavity 10. The light-transmitting plate 12 is mounted on the side panel 111 to close the hollow portion 112. The bracket 11 and the light-transmitting plate 12 together form the aforementioned accommodating cavity 10. A snap-fitting portion 120 is provided on the edge of at least one of the light-transmitting plate 12 and the side panel 111 facing the hollow portion 112. The snap-fitting portion 120 has snap-fitting surfaces 1200 provided on both sides of the side panel 111 in the second direction X. At least a portion of the other snap-fitting portion 120 is snap-fitted to the snap-fitting portion 120 to define the position of the light-transmitting plate 12 in the second direction X.

[0053] Reference Figure 5-Figure 7 Specifically, in the embodiment of the present application, the clamping portion 120 is provided on the light-transmitting plate 12 as a part of the light-transmitting plate 12. It is understandable that in some other optional embodiments, the clamping portion 120 can be provided separately on the light-transmitting plate 12, in which case the clamping portion 120 is clamped and matched with the side panel 111. Alternatively, the clamping portion 120 is provided separately on the side panel 111, in which case the clamping portion 120 is clamped and matched with the light-transmitting plate 12. Alternatively, part of the clamping portion 120 is provided on the light-transmitting plate 12, and part of the clamping portion 120 is provided on the side panel 111. In this case, the clamping portion 120 provided on the light-transmitting plate 12 is clamped and matched with the side panel 111, and the clamping portion 120 provided on the side panel 111 is clamped and matched with the light-transmitting plate 12. Finally, the clamping and matching of the clamping portion 120 can achieve the limited fixation of the light-transmitting plate 12 and the side panel 111 in the second direction X.

[0054] It should be noted that in the embodiment of the present application, four side panels 111 are provided, each of which is arranged in a square shape. Each side panel 111 has a hollow portion 112 and is mounted with a light-transmitting plate 12. Therefore, in one example, the second direction X refers to the thickness direction of the light-transmitting plate 12.

[0055] By implementing the above technical solution, the conditions inside the housing 1, such as the liquid level after electrolyte injection and the infiltration of the electrode assembly 2, can be directly observed through the light-transmitting plate 12, thereby facilitating the staff to intuitively and quickly understand the conditions inside the housing 1, providing a basis for quick and accurate judgment for subsequent processing. In addition, in this solution, by providing a snap-fitting engagement between the snap-fitting portion 120 on one of the light-transmitting plate 12 or the side plate 111 and the other, the position of the light-transmitting plate 12 in the second direction X is limited, thereby improving the connection strength between the light-transmitting plate 12 and the side plate 111. While realizing the separate design of the light-transmitting plate 12 and the bracket 11 to assemble into the housing 1, the strength of the housing 1 can also be ensured. In addition, the snap-fitting engagement of the snap-fitting portion 120 can reduce the welding workload, improve processing efficiency, and facilitate the flexible selection of materials for the light-transmitting plate 12.

[0056] Among them, the reduction in welding workload can be understood as follows: since the main influence affecting the stability of the connection between the side plate 111 and the light-transmitting plate 12 is the outward squeezing force of the electrode assembly 2 when it expands, normally for the side plate 111, this squeezing force spreads outward along the second direction X. In the embodiment of the present application, the snap-fitting portion 120 is used to achieve the snap-fitting of the light-transmitting plate 12 and the side plate 111, so that the side plate 111 and the light-transmitting plate 12 can be at least partially fixed in the second direction X. The corresponding area does not need to be welded and fixed, thus reducing the welding workload. The flexible selection of the material of the light-transmitting plate 12 can be understood as follows: since the light-transmitting plate 12 can be optionally snap-fitted to the side plate 111, some materials that do not support welding can be selected for the light-transmitting plate 12, providing more diverse choices.

[0057] Reference Figure 5-Figure 7 In the embodiment of the present application, the light-transmitting plate 12 has a circumferential direction Y intersecting the second direction X. The engaging portion 120 is disposed along the circumferential direction Y, surrounding the outer periphery of the light-transmitting plate 12 in the circumferential direction Y, forming a closed annular structure. The engaging portion 120 is disposed on the light-transmitting plate 12 and is a continuous, integral structure along the circumferential direction Y. This allows the side panels 111 located around the hollow portion 112 to fully engage with the engaging portion 120, further enhancing the stability of the connection between the light-transmitting plate 12 and the bracket 11, thereby ensuring the reliability of the housing 1.

[0058] Reference Figure 4-Figure 7As an optional embodiment of the present invention, the hollow portion 112 has an inner wall surface 1121 along the circumferential direction Y. The inner wall surface 1121 refers to the inner surface of the side panel 111 facing the hollow portion 112. The inner wall surface 1121 is an annular surface that is continuous from beginning to end along the circumferential direction Y. The light-transmitting plate 12 includes a main body 121 and a clamping portion 120. The main body 121 is a rectangular plate and has an outer peripheral surface 1211 extending along the circumferential direction Y. The outer peripheral surface 1211 is disposed opposite the inner wall surface 1121. The clamping portion 120 is protruding from the outer peripheral surface 1211. The clamping portion 120 includes a first clamping protrusion 122 and a second clamping protrusion 123, and the first clamping protrusion 122 and the second clamping protrusion 123 are both arranged around the circumferential direction Y; wherein, the first clamping protrusion 122 and the second clamping protrusion 123 are respectively arranged on both sides of the side plate 111 in the second direction X, and the surfaces of the first clamping protrusion 122 and the second clamping protrusion 123 facing the side plate 111 constitute a clamping surface 1200.

[0059] More specifically, the main body 121 is embedded within the hollow portion 112, with the outer surface 1211 and the inner wall surface 1121 being disposed in contact with each other. The outer surface 1211 is larger in the second direction X than the inner wall surface 1121 in the second direction X. In the second direction X, the outer surface 1211 extends outward from the inner wall surface 1121, and the first and second engaging protrusions 122 and 123 are disposed on the extended portions of the outer surface 1211. The first and second engaging protrusions 122 and 123 are plate-shaped, each having a thickness D mm in the second direction X, where D satisfies 0.2 ≤ D ≤ 0.4. In the first direction Z, the first and second engaging protrusions 122 and 123 extend from the outer surface 1211 away from the outer surface 1211 by a length L mm, where L satisfies 2 ≤ L ≤ 3. It is understandable that the design of D and L is related to the application scenario and battery type, and can be adaptively adjusted according to actual needs.

[0060] Reference Figure 8 and Figure 9It should be noted that, in an optional example, the light-transmitting plate 12 can also be designed into other structures. The light-transmitting plate 12 has a circumferential direction Y intersecting with the second direction X. The light-transmitting plate 12 includes a main body 121 and a clamping portion 120 connected to each other; the main body 121 has an outer peripheral surface 1211, and the outer peripheral surface 1211 is arranged opposite to the inner wall surface 1121. The main body 121 is arranged in the hollow portion 112; the clamping portion 120 includes a first limiting protrusion 1201 and a second limiting protrusion 1202, and the first limiting protrusion 1201 and the second limiting protrusion 1202 are both arranged on the outer peripheral surface. 1211, the first limiting protrusion 1201 and / or the second limiting protrusion 1202 extend circumferentially along the circumferential direction Y, and the first limiting protrusion 1201 and / or the second limiting protrusion 1202 are intermittently arranged between the head and the tail; wherein, the first limiting protrusion 1201 and the second limiting protrusion 1202 are respectively arranged on both sides of the side plate 111 in the second direction X, and the surfaces of the first limiting protrusion 1201 and the second limiting protrusion 1202 facing the side plate 111 constitute a clamping surface 1200.

[0061] More specifically, the configuration in which the first limiting protrusion 1201 and the second limiting protrusion 1202 are both discontinuously arranged in the circumferential direction Y may include the following situations: for example Figure 8 As shown in FIG, in the second direction X, the projections of the first limiting protrusion 1201 and the second limiting protrusion 1202 on the engaging surface 1200 do not overlap with each other, that is, the two are staggered along the circumferential direction Y. Alternatively, Figure 8 Other embodiments can be derived, for example Figure 9 In the second direction X, the projections of the first limiting protrusion 1201 and the second limiting protrusion 1202 on the engaging surface 1200 at least partially overlap, meaning that they at least partially face each other in the second direction X. The first limiting protrusion 1201 and the second limiting protrusion 1202 of the above structure are discontinuous in the circumferential direction Y, which saves material and reduces the difficulty of the manufacturing process. However, compared to a continuous first limiting protrusion 1201 and second limiting protrusion 1202, this structure has limited reliability and lacks sufficient retaining force for the light-transmitting plate 12.

[0062] Specifically, the first limiting protrusion 1201 and the second limiting protrusion 1202 can be one or more. In the case of more than one, the first limiting protrusions 1201 are spaced apart, or the second limiting protrusions 1202 are spaced apart.

[0063] In this embodiment, unlike the aforementioned light-transmitting plate 12 structure, the clipping portion 120 is discontinuous in the circumferential direction Y. That is, the side panels 111 and the light-transmitting plate 12 are only secured by the discontinuous clipping portion 120. Unlike the aforementioned light-transmitting plate 12, this embodiment reduces the processing complexity and material requirements of the light-transmitting plate 12 itself. However, the connection strength between the light-transmitting plate 12 and the side panels 111 in this embodiment is generally weaker than that of the aforementioned light-transmitting plate 12 structure. Adhesion or welding can be used to strengthen the connection between the light-transmitting plate 12 and the side panels 111 to improve reliability.

[0064] Reference Figure 3-Figure 4 、 Figure 10-11 As an optional embodiment of the present application, the single battery further includes a stabilizing member 4, which is disposed on the side panel 111. The stabilizing member 4 includes a fixing portion 41 extending through the side panel 111 and a limiting portion 42 connected to the fixing portion 41. A limiting space 40 is defined between the limiting portion 42 and the side panel 111, and the edge of the light-transmitting plate 12 is partially engaged within the limiting space 40. The limiting portion 42 can further limit the position of the light-transmitting plate 12 in the second direction X, thereby further improving the secure connection between the light-transmitting plate 12 and the bracket 11, thereby achieving separate snap-fit ​​assembly of the light-transmitting plate 12 and the bracket 11 while improving the reliability of the housing 1.

[0065] Specifically, a fixing hole 1110 extending along the second direction X is provided on the side panel 111. In one example, the fixing hole 1110 is provided through the side panel 111. Most of the fixing portion 41 is located in the fixing hole 1110 so that the fixing portion 41 is passed through the fixing hole 1110. In the second direction X, the projection of the light-transmitting plate 12 on the side panel 111 partially overlaps with the area defined by the fixing hole 1110, and the fixing portion 41 is fixedly connected to the light-transmitting plate 12. In one example, the processing process of the fixing portion 41 is in a fluid or semi-fluid state, and a fluid or semi-fluid material such as resin is selected and injected into the fixing hole 1110 and then solidified, which enables the fixing portion 41 to be connected to the light-transmitting plate 12. Specifically, the fixing portion 41 adheres to the snap-fit ​​surface 1200 to achieve connection with the light-transmitting plate 12. It should be noted that in the embodiment of the present application, the limiting portion 42 is integrally connected to the fixing portion 41. Before processing, the limiting portion 42 is also in a fluid or semi-fluid state, and the limiting portion 42 and the fixing portion 41 are formed together in the mold. In other optional embodiments, the limiting portion 42 can also be fixedly connected to the fixing portion 41 through subsequent secondary processing.

[0066] The above arrangement allows the fixing portion 41 to be fixed within the fixing hole 1110, thereby achieving a secure connection between the fixing portion 41 and the side panel 111. At the same time, the fixing portion 41 is also securely connected to the light-transmitting panel 12. Thus, the fixing portion 41 acts as an intermediate connector, further stabilizing the connection between the light-transmitting panel 12 and the side panel 111, thereby improving the overall structural stability of the housing 1. To enhance reliability, multiple stabilizing members 4 are provided along the circumference Y of each side panel 111, along the circumference of the hollow portion 112.

[0067] Back to Figure 6 and Figure 7 As an optional embodiment of the present invention, the single cell further includes a sealing layer 5, which is disposed at the contact point between the edge of the light-transmitting plate 12 and the side panel 111. The sealing layer 5 ensures the sealing performance of the connection between the light-transmitting plate 12 and the side panel 111, thereby ensuring the reliability of the housing 1. It should be noted that while the sealing layer 5 is disposed on the exterior of the housing 1 in the present embodiment, in other optional embodiments, the sealing layer 5 may alternatively be disposed on the interior of the housing 1.

[0068] The following explains the process of assembling the light-transmitting plate 12 and the side plate 111.

[0069] Since the outer peripheral surface 1211 of the light-transmitting plate 12 is provided with the clamping portion 120, it is difficult to directly mount the light-transmitting plate 12 on the side plate 111. Therefore, the following two methods are used to complete the processing of the housing 1 in the present application.

[0070] First, use the injection molding method. Figure 12 After the hollow portion 112 is opened on the side panel 111, the mold 500 is used to cover the two sides of the hollow portion 112 in the second direction X. The mold 500 includes a left mold 501 and a right mold 502. During injection molding, the left mold 501 and the right mold 502 can be pressed against the side panel 111 by an external machine or equipment, so that a mold cavity for molding the light-transmitting plate 12 is formed between the left mold 501 and the right mold 502. A transparent or light-transmitting fluid or semi-fluid material such as a resin is injected into the mold cavity after curing, and the light-transmitting plate 12 can be formed after curing.

[0071] Second, adopt the form of split welding. Figure 13 Before assembly, the bracket 11 is designed as a split structure. In the first direction Z, the bracket 11 above the hollow portion 112 forms a first portion 601, while the bracket 11 below the hollow portion 112 forms a second portion 602. The first portion 601 and the second portion 602 are designed separately before assembly. During processing, each light-transmitting plate 12 is first snapped into the hollow portion 112 along the first direction Z, and then the first portion 601 is welded to the second portion 602. The specific welding location can be the weld 60 indicated by the dotted line in the figure.

[0072] The above description is only a partial implementation of the embodiments of the present application and does not constitute any form of limitation to the application. The protection scope of the embodiments of the present application is not limited thereto. Any simple modifications, equivalent changes and modifications that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed in the embodiments of the present application should be covered within the protection scope of the embodiments of the present application.

Claims

1. A single battery, characterized in that: Having a first direction (Z), the single battery comprises: A housing (1) having a receiving cavity (10); An electrode assembly (2) is disposed in the accommodating cavity (10); A top cover (3) is provided on the outer shell (1) along the first direction (Z) to close the accommodating cavity (10); The housing (1) comprises a bracket (11) and a light-transmitting plate (12), the bracket (11) and the light-transmitting plate (12) enclose the accommodating cavity (10), the bracket (11) has a side plate (111) extending along the first direction (Z), the light-transmitting plate (12) has a second direction (X) intersecting with the first direction (Z), the side plate (111) is provided with a hollow portion (112) passing through along the second direction (X) and communicating with the accommodating cavity (10), and the light-transmitting plate (12) is connected to the side plate (111) to close the hollow portion (112); Wherein, at least one of the light-transmitting plate (12) and the side plate (111) is provided with a clamping portion (120) toward the edge of the hollow portion (112), the clamping portion (120) having clamping surfaces (1200) respectively provided on both sides of the side plate (111) in the second direction (X), and at least a portion of the other is clamped with the clamping portion (120) to limit the position of the light-transmitting plate (12) in the second direction (X).

2. The single cell according to claim 1, wherein: The light-transmitting plate (12) has a circumferential direction (Y) intersecting with the second direction (X), and the clamping portion (120) is arranged around the outer peripheral side of the light-transmitting plate (12) along the circumferential direction (Y).

3. The single cell according to claim 2, wherein: The hollow portion (112) has an inner wall surface (1121) along the circumferential direction (Y); The light-transmitting plate (12) comprises a main body portion (121) and the clamping portion (120); The main body (121) has an outer peripheral surface (1211), the outer peripheral surface (1211) is arranged opposite to the inner wall surface (1121), the main body (121) is arranged in the hollow portion (112), and the clamping portion (120) is protruded on the outer peripheral surface (1211); The clamping portion (120) comprises a first clamping protrusion (122) and a second clamping protrusion (123), and the first clamping protrusion (122) and the second clamping protrusion (123) are both arranged circumferentially along the circumferential direction (Y); The first clamping protrusion (122) and the second clamping protrusion (123) are respectively arranged on both sides of the side plate (111) in the second direction (X), and the surfaces of the first clamping protrusion (122) and the second clamping protrusion (123) facing the side plate (111) both constitute the clamping surface (1200).

4. The single cell according to claim 1, wherein: The light-transmitting plate (12) has a circumferential direction (Y) intersecting the second direction (X), and the light-transmitting plate (12) comprises a main body portion (121) and the clamping portion (120) connected to each other: The main body (121) has an outer peripheral surface (1211), the hollow portion (112) has an inner wall surface (1121) along the circumferential direction (Y), the outer peripheral surface (1211) and the inner wall surface (1121) are arranged opposite to each other, and the main body (121) is arranged in the hollow portion (112); The clamping portion (120) comprises a first limiting protrusion (1201) and a second limiting protrusion (1202), the first limiting protrusion (1201) and the second limiting protrusion (1202) are both arranged on the outer peripheral surface (1211), at least one of the first limiting protrusion (1201) and / or the second limiting protrusion (1202) is provided and extends along the circumferential direction (Y), and the first limiting protrusion (1201) and / or the second limiting protrusion (1202) are intermittently arranged between the head and the tail; The first limiting protrusion (1201) and the second limiting protrusion (1202) are respectively arranged on both sides of the side plate (111) in the second direction (X), and the surfaces of the first limiting protrusion (1201) and the second limiting protrusion (1202) facing the side plate (111) constitute the clamping surface (1200).

5. The single cell according to any one of claims 2 to 4, characterized in that: It also includes a stabilizing member (4), wherein the stabilizing member (4) is arranged on the side plate (111); The stabilizing member (4) comprises a fixing portion (41) passing through the side panel (111) and a limiting portion (42) connected to the fixing portion (41); a limiting space (40) is provided between the limiting portion (42) and the side panel (111); and an edge of the light-transmitting plate (12) is partially engaged in the limiting space (40).

6. The single cell according to claim 5, wherein: The side plate (111) is provided with a fixing hole (1110) extending along the second direction (X), and the fixing portion (41) is passed through the fixing hole (1110).

7. The single cell according to claim 6, wherein: Along the second direction (X), the projection of the light-transmitting plate (12) on the side plate (111) partially overlaps with the area defined by the fixing hole (1110), and the fixing portion (41) is fixedly connected to the light-transmitting plate (12).

8. The single cell according to claim 7, wherein: A plurality of the stabilizing members (4) are provided along the circumference of the hollow portion (112).

9. The single cell according to any one of claims 2 to 4, characterized in that: It also includes a sealing layer (5), which is arranged at a position where the edge of the light-transmitting plate (12) contacts the side plate (111).

10. A battery pack, characterized in that: include: a box body having a receiving cavity; and The single cell according to any one of claims 1 to 9 is accommodated in the accommodating cavity.

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