CN219959291U - A battery module and battery pack - Google Patents

Abstract

The utility model relates to the technical field of batteries, and discloses a battery module and a battery pack, wherein the battery module comprises a shell, a single battery, a cover plate and a separation plate. The housing is provided with a receiving cavity and a first opening which are mutually communicated. The single battery is arranged in the accommodating cavity and is provided with a plurality of single batteries. The cover plate is covered on the first opening and is connected with the shell. The isolation plate is arranged at the first opening and is positioned between the single battery and the cover plate. The cover plate comprises a cover plate main body and a connecting protrusion, wherein the connecting protrusion is provided with a limiting surface and a second section. The isolation board is provided with a clamping groove, and the clamping groove is provided with a groove side wall. After the connecting protrusion is inserted into the clamping groove, the side wall of the groove is matched with the limiting surface and the second section to limit the connecting protrusion in the clamping groove, so that the connecting protrusion is prevented from being separated from the clamping groove, and the cover plate is fixedly connected with the isolation plate. That is, when assembling the battery module, only need make the connection protruding joint groove of inserting can make apron and division board fixed connection, easy operation, the assembly efficiency of battery module is high.

Description

A battery module and battery pack

Technical field

The utility model relates to the field of battery technology, in particular to a battery module and a battery pack.

Background technique

The main function of the battery module is to protect the single battery and provide power energy. Its structure mainly includes a casing, a single battery, a cover plate and an isolation plate. Among them, there are multiple single cells and are located in the outer casing. The isolation plate is used It is electrically isolated and located above the single battery, and the cover is fixedly connected to the isolation plate. In the existing technology, the cover plate and the isolation plate are usually fixedly connected by adding double-sided tape or adding structural parts. To connect the cover plate and the isolation plate in this way, the two need to be connected by adding double-sided tape. Or structural parts, the operation is complicated, and the assembly efficiency of battery modules is low.

Utility model content

The purpose of this utility model is to provide a battery module with high assembly efficiency.

In order to achieve the above purpose, the present utility model provides a battery module, including:

The shell is provided with a receiving cavity and a first opening that communicate with each other;

A plurality of single cells are located in the accommodation cavity;

A cover plate, covering the first opening and connected to the housing;

An isolation plate located between the single cell and the cover;

The cover plate includes:

The cover body has a first side facing the isolation plate;

Connecting protrusions are spaced on the first side. The connecting protrusions include a first section, a connecting section and a second section connected in sequence along the first direction. The first section is connected to the first side. , the connecting section has a limiting surface connecting the first section and the second section, and the extending direction of the limiting surface from the first section to the second section is oblique to the first direction. pay;

The isolating plate is provided with an engaging groove on one side facing the first side, the connecting protrusion is inserted into the engaging groove, and the engaging groove has connected groove side walls and groove bottom walls. The groove side wall is in contact with the limiting surface, the second section is opposite to the groove bottom wall and is in contact with the groove side wall. Along the first direction, the groove side wall is in contact with the groove side wall. The projections of the limiting surface and the second section on a plane perpendicular to the first direction at least partially overlap, so that the isolation plate and the cover plate are limited in the first direction.

In a specific embodiment of the present invention, along the second direction, the distance between the second section and the same side of the first section connected to the limiting surface is D 1 mm, and the distance between the first direction and the first section is D ₁ mm. The second direction intersects; along the first direction, the side of the first section and the second section that is away from each other has a distance D ₂ mm, which satisfies: 0.025 ≤ D ₁ /D ₂ ≤ 0.16.

In a specific embodiment of the present invention, the battery module satisfies: 0.2≤D ₁ ≤0.5, and/or, 3≤D ₂ ≤8.

In a specific embodiment of the present invention, along the first direction, an avoidance gap is provided between the second section and the bottom wall of the groove.

In a specific embodiment of the present invention, the first section, the connecting section and the second section are integrally connected.

In a specific embodiment of the present invention, the first section, the connecting section and the second section are all rotary structures, and the rotation center line of the rotary structure is parallel to the first direction.

In a specific embodiment of the present invention, the cover body also has an upper surface facing away from the isolation plate, a cavity is provided inside the connecting protrusion, and a cavity connected to the cavity is provided on the upper surface. The second opening.

In a specific embodiment of the present invention, the isolation plate is also provided with a plurality of first receiving grooves on one side facing the first side, and the engaging grooves have multiple, at least partially along the third direction. The first receiving groove and at least part of the engaging groove are arranged alternately;

The battery module also includes:

A plurality of bus bars are arranged in a plurality of first accommodation slots in one-to-one correspondence, and a plurality of the bus bars are connected in series with a plurality of single cells.

In a specific embodiment of the present invention, the isolation plate is also provided with a second accommodation groove on one side facing the first side; the isolation plate is also provided with a positioning post;

The battery module also includes:

The FPC board is disposed in the second accommodation groove. The FPC board is provided with a positioning hole penetrating along the first direction; the positioning post is passed through the positioning hole.

The utility model also proposes a battery pack, including:

box;

As mentioned above, the battery module is installed in the box.

Compared with the existing technology, the battery module and battery pack according to the embodiment of the present utility model have the following beneficial effects:

In the present utility model, the connecting protrusion includes a first section, a connecting section and a second section connected in sequence along the first direction, wherein the connecting section has a limiting surface, and the limiting surface extends from the first section to the second section. The direction is obliquely intersecting with the first direction. The engaging groove has connected groove side walls and groove bottom walls. In practical applications, the cover plate and the isolation plate are arranged along the first direction, the connecting protrusion is inserted into the engaging groove and the limiting surface is in contact with the side wall of the groove, and the second section is accommodated in the engaging groove and connected with the groove. The side walls are in contact with each other, and the projection of the groove side wall, the limiting surface, and the second section on a plane perpendicular to the first direction at least partially overlaps. Based on this, after the connecting protrusion is inserted into the engaging groove, the groove side wall The wall cooperates with the limiting surface and the second section to limit the connecting protrusion in the engaging groove, and the second section is also limited in the engaging groove, so that the isolation plate and the cover plate are double limited in the first direction. This effectively prevents the connecting protrusion from escaping from the engaging groove along the first direction, so that the cover plate and the isolation plate are fixedly connected. That is, when assembling the battery module, you only need to insert the connecting protrusion into the engaging groove to firmly connect the cover plate and the isolation plate. The operation is simple and the assembly efficiency of the battery module is high.

Description of the drawings

Figure 1 is a structural diagram of a battery module according to an embodiment of the present invention;

Figure 2 is an exploded view of the battery module according to the embodiment of the present invention;

Figure 3 is a structural diagram of the cover plate according to the embodiment of the present utility model;

Figure 4 is a structural diagram of an isolation plate according to an embodiment of the present utility model;

Figure 5 is a structural diagram of the connecting protrusion according to the embodiment of the present utility model;

Figure 6 is a cross-sectional structural view of the connecting protrusion according to the embodiment of the present utility model;

Figure 7 is another structural diagram of the connecting protrusion according to the embodiment of the present utility model;

Figure 8 is a structural view of the connecting protrusion and the engaging groove according to the embodiment of the present invention;

Figure 9 is a structural diagram of the engaging groove according to the embodiment of the present invention.

In the figure, 20. Shell; 30. Cover plate; 31. Cover body; 311. First side; 32. Connection protrusion; 3201. Cavity; 3202. Second opening; 321. First section; 322. Connection Section; 3221, limiting surface; 323, second section; 40, isolation plate; 401, engagement groove; 4011, groove side wall; 4012, groove bottom wall; 402, first accommodation groove; 403, second accommodation Slot; 41. Positioning post; 50. Bus bar; 60. FPC board; 601. Positioning hole; 100. Avoidance gap; X, first direction; Y, second direction; Z, third direction.

Detailed ways

The specific implementation manner of the present utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not used to limit the scope of the present invention.

In the description of this application, it needs to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " The directions indicated by "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" etc. or The positional relationship is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, Therefore, it cannot be construed as a limitation on this application. In addition, the terms “first” and “second” are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Thus, features defined as “first” and “second” may explicitly or implicitly include one or more of the described features. In the description of this application, the meaning of "plurality" refers to two or more than two, unless otherwise explicitly and specifically limited.

In the description of this application, it should be noted that, unless otherwise clearly stated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. Connection, or integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, or an internal connection between two elements or an interactive relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

In this application, unless otherwise explicitly stated and limited, the term "above" or "below" a first feature on a second feature may include direct contact between the first and second features, or may also include the first and second features. Not in direct contact but through additional characteristic contact between them. Furthermore, the terms "above", "above" and "above" a first feature on a second feature include the first feature being directly above and diagonally above the second feature, or simply mean that the first feature is higher in level than the second feature. “Below”, “below” and “beneath” the first feature of the second feature includes the first feature being directly above and diagonally above the second feature, or simply means that the first feature has a smaller horizontal height than the second feature.

In this application, the term "parallel" includes not only the absolutely parallel situation, but also the roughly parallel situation that is conventionally recognized in engineering; at the same time, the term "perpendicular" includes not only the absolutely vertical situation, but also the roughly parallel situation that is conventionally recognized in engineering. vertical situation. Equality of distances or equal angles includes not only absolute equality, but also rough equality as conventionally understood in engineering, which means there is a certain error.

The utility model proposes a battery pack, which includes a box body in which a battery module is arranged.

As shown in Figures 1-5, a battery module according to a preferred embodiment of the present invention includes a casing 20, a single cell, a cover 30 and an isolation plate 40. The housing 20 is provided with a receiving cavity and a first opening that communicate with each other. There are multiple single cells arranged in the accommodation cavity. The cover 30 covers the first opening and is connected to the housing 20 . The isolation plate 40 is located at the first opening and between the single cell and the cover 30 .

Further, the cover 30 includes a cover body 31 and a connecting protrusion 32 . The isolation plate 40 is provided with an engaging groove 401 . The connecting protrusion 32 is inserted into the engaging groove 401 to connect the cover plate 30 and the isolation plate 40 together.

Specifically, the cover body 31 has a first side 311 facing the isolation plate 40 . The connecting protrusions 32 have a plurality and are spaced on the first side 311. The connecting protrusions 32 include a first section 321, a connecting section 322 and a second section 323 connected in sequence along the first direction One side 311 is connected, and the connecting section 322 is connected between the first section 321 and the second section 323. The connecting section 322 has a limiting surface 3221 connecting the first section 321 and the second section 323. The limiting surface 3221 extends from the first section 321 to the second section 323. The extension direction of 321 to the second section 323 is obliquely intersecting with the first direction X, wherein the extension direction of the limiting surface 3221 is the overall extension direction.

There are multiple engaging grooves 401 and they are all provided on the side of the isolation plate 40 facing the first side 311. As shown in Figure 9, the engaging groove 401 has connected groove side walls 4011 and a groove bottom wall 4012. The groove side walls The angle between 4011 and the groove bottom wall 4012 is less than 90°. It should be noted that the angle between the groove side wall 4011 and the groove bottom wall 4012 is the plane where the groove bottom wall 4012 is located and the overall extension direction of the groove side wall 4011 surrounded.

In practical applications, the cover plate 30 and the isolation plate 40 are arranged along the first direction The segments 323 are opposite, and the second segment 323 is in contact with the groove side wall 4011. Along the first direction At least partially overlap, that is, the projection of the groove side wall 4011 and the limiting surface 3221 at least partially overlap, and the projection of the groove side wall 4011 and the second section 323 at least partially overlap. Based on this, the groove side wall 4011 cooperates with the limiting surface 3221 and the second section to limit the connecting protrusion 32 in the engaging groove 401, and the second section is limited in the engaging groove 401, thereby achieving double limiting and preventing the connecting protrusion from The lift 32 is disengaged from the engaging groove 401 along the first direction X, so that the cover plate 30 and the isolation plate 40 are connected reliably. That is, when assembling the battery module, you only need to insert the connecting protrusion 32 into the engaging groove 401 to firmly connect the cover 30 and the isolation plate 40. The operation is simple and the assembly efficiency of the battery module is high.

In the present utility model, the first section 321, the connecting section 322 and the second section 323 of the connecting protrusion 32 are integrally connected. Among them, the limiting surface 3221 can be a flat surface or an arc surface; the connecting section 322 can have one, two, three or more limiting surfaces 3221, which can cooperate with the engaging groove 401 to cover the cover. The plate 30 is fixedly connected to the isolation plate 40 . As shown in FIG. 5 , the connecting section 322 has one limiting surface 3221 . As shown in FIG. 7 , the connecting section 322 has two limiting surfaces 3221 arranged oppositely. The utility model does not limit this.

The present invention is illustrated by taking the connection section 322 having a limiting surface 3221 as an example. Specifically, the battery module also has a second direction Y, and the first direction X intersects the second direction Y. In some embodiments, the first direction X is perpendicular to the second direction Y; as shown in Figure 5, along the In the second direction Y, the distance between the second section 323 and the same side of the first section 321 is D ₁ mm. Specifically, the distance D ₁ refers to: along the second direction Y, the first section 321 and the second section 323 on the same side, the distance between the connection point between the first section 321 and the limiting surface 3221 and the connection point between the second section 323 and the limiting surface 3221. _{Along the first direction _} Composed of one or any two of 0.035, 0.039, 0.044, 0.048, 0.052, 0.056, 0.066, 0.074, 0.089, 0.096, 0.106, 0.112, 0.120, 0.125, 0.132, 0.140, 0.145, 0.150, 0.155 range. Among them, D ₁ /D ₂ satisfying this relationship can make the size and shape of the connecting protrusion 32 suitable and ensure the limiting effect produced by the cooperation between the connecting protrusion 32 and the engaging groove 401. Specifically, take Figure 5 as an example. To illustrate, the greater the ratio, the smaller the overall size of the connecting protrusion 32 is, and subsequently the lower the production cost. At this time, the angle between the limiting surface 3221 and the vertical surface The larger the value, the better the limiting effect produced by the coupling of the connecting protrusion 32 and the engaging groove 401. However, since the connecting protrusion 32 cooperates with the engaging groove 401 through limiting engagement, the limiting surface The greater the angle between 3221 and the vertical surface, the greater the difficulty in inserting the connecting protrusion 32 into the engaging groove 401. The smaller the ratio, the larger the overall size of the connecting protrusion 32 will be, and the higher the production cost will be. At this time, the effect will also become worse. However, the connecting protrusion 32 The difficulty of inserting into the engaging groove 401 is reduced. Therefore, if D ₁ /D ₂ satisfies this relational expression, the limiting effect and assembly difficulty of the connection protrusion 32 and the engaging groove 401 can be taken into consideration.

Preferably, the battery module satisfies: 0.2≤D ₁ ≤0.5, and/or, 3≤D ₂ ≤8, so as to better balance the limiting effect of the connection protrusion 32 and the engagement groove 401 and the difficulty of assembly.

Specifically, the distance D ₁ is measured as follows: cutting the cover plate 30 to form the structure as shown in FIG. 6 , taking the connection between the limiting surface 3221 and the first section 321 as the base point and making a cut perpendicular to the first section on the cutting surface. The first datum line of the side 311 is a second datum line perpendicular to the first side 311 on the cutting surface, taking the connection between the limiting surface 3221 and the second section 323 as the base point, where the first datum line and the second datum line The lines are all located on the cutting surface of the cover body 31. Use a length measuring tool to measure the distance between the first datum line and the second datum line multiple times to obtain multiple first measurement values. Find the value of the multiple first measurement values. The first average value is the distance D ₁ .

The distance D ₂ is measured as follows: taking the first side 311 as the first datum plane, taking the side of the connecting protrusion 32 facing away from the cover body 31 as the second datum plane, and using a length measuring tool to measure the first datum plane multiple times. The distance from the second reference plane is to obtain a plurality of second measurement values, and a second average value of the plurality of second measurement values is obtained. The second average value is the distance D ₂ .

In some embodiments, as shown in Figure ₈ , along the first direction , after the connecting protrusion 32 is inserted into the engaging groove 401, the first side 311 of the cover body 31 can be close to the isolation plate 40, and there is no gap between the first side 311 and the isolation plate 40, so that the structure of the battery module More compact.

In some embodiments, as shown in Figures 1-3 and 8, the cover body 31 also has an upper surface facing away from the isolation plate 40. A cavity 3201 is provided inside the connecting protrusion 32, and a cavity 3201 is provided on the upper surface. The connected second opening 3202, specifically, the first section 321, the connecting section 322 and the second section 323 jointly define a cavity 3201. The connecting protrusions 32 and the cover plate 30 of this structure can be manufactured by blister molding, which is easy to produce.

In other embodiments, the connecting protrusion 32 may also have a solid structure without the cavity 3201, and the present invention does not limit this.

In other embodiments, the first section 321, the connecting section 322 and the second section 323 are all rotary structures, and the center line of rotation of the rotary structure is parallel to the first direction X. The rotary body structure such as the connecting section 322 is a truncated cone structure, and its smaller end is connected to the cover body 31. At this time, the outer wall surface of the connecting section 322 is the limiting surface 3221. Based on this, when the connecting protrusion 32 is inserted into the engagement After entering the groove 401, the cover plate 30 can also be fixedly connected to the isolation plate 40, and the rotary structure can be limited with the isolation plate 40 in the circumferential direction of the connecting protrusion 32, thereby improving the connection between the cover plate 30 and the isolation plate. 40% connection reliability. The utility model does not limit this.

In practical applications, the battery module also includes a bus 50 . There are multiple bus bars 50 , and the multiple bus bars 50 connect multiple single cells in series.

In some embodiments, as shown in FIGS. 2 and 4 , a plurality of first receiving slots 402 are also formed on the side of the isolation plate 40 facing the first side 311 , and the plurality of bus bars 50 are provided in a one-to-one correspondence with the plurality of first receiving slots 402 . In the first accommodation slot 402, the electrical isolation effect is good; there are multiple engaging slots 401, and one engaging slot 401 is a connection point between the isolation plate 40 and the cover plate 30. Along the third direction Z, at least part of the first The accommodating grooves 402 and at least part of the engaging grooves 401 are arranged alternately, making full use of the position between two adjacent first accommodating grooves 402, and also improving the stability of the fixed connection between the cover plate 30 and the isolation plate 40.

In practical applications, the battery module also includes an FPC board 60 , and the FPC board 60 is connected to the bus 50 to collect working parameters such as the voltage of a single battery.

In some embodiments, as shown in Figures 2 and 4, the isolation plate 40 is also provided with a second receiving groove 403 on the side facing the first side 311; the isolation plate 40 is also provided with a positioning post 41, and the positioning post 41 A plurality of FPC boards 60 are provided at intervals on the second accommodating groove 403; the FPC board 60 is provided in the second accommodating groove 403, and the FPC board 60 is provided with a plurality of positioning holes 601 penetrating along the first direction X; a plurality of positioning holes 601 are provided. The posts 41 are respectively penetrated through a plurality of positioning holes 601, that is, the positioning posts 41 correspond to the positioning holes 601 one-to-one, and the FPC board 60 can be positioned and installed on the isolation plate 40, so that the FPC board 60 can be installed stably and prevent it from being Shake during actual application.

Specifically, the second accommodating groove 403 is elongated, and its length direction is parallel to the third direction Z, and the first accommodating groove 402 and the engaging groove are provided on both sides of the length direction of the second accommodating groove 403. slot 401.

To sum up, in the battery module of the present invention, the cover 30 includes a connecting protrusion 32, and the isolation plate 40 is provided with an engaging groove 401. The connecting protrusion 32 and the engaging groove 401 cooperate through limiting engagement, and the battery When assembling the module, you only need to insert the connecting protrusion 32 into the engaging groove 401 to make the cover 30 and the isolation plate 40 fixedly connected. This is easy to operate and the assembly efficiency of the battery module is high.

The above are only preferred embodiments of the present invention. It should be pointed out that those skilled in the art can make several improvements and substitutions without departing from the technical principles of the present invention. These improvements and replacement should also be regarded as the protection scope of the present utility model.

Claims (10)

1. A battery module, including: The shell (20) is provided with a receiving cavity and a first opening that communicate with each other; A plurality of single cells are located in the accommodation cavity; Cover plate (30), covering the first opening and connected to the housing (20); An isolation plate (40) is provided between the single cell and the cover plate (30); characterized by: The cover plate (30) includes: The cover body (31) has a first side (311) facing the isolation plate (40); The connecting protrusions (32) are spaced on the first side (311). The connecting protrusions (32) include a first section (321) and a connecting section (322) connected in sequence along the first direction (X). ) and a second section (323), the first section (321) is connected to the first side (311), and the connecting section (322) has a function to connect the first section (321) and the second section (323). The limiting surface (3221) of the section (323), the extending direction of the limiting surface (3221) from the first section (321) to the second section (323) is consistent with the first direction (X) oblique; The isolation plate (40) is provided with an engaging groove (401) on one side facing the first side (311), and the connecting protrusion (32) is inserted into the engaging groove (401). The engaging groove (401) has a connected groove side wall (4011) and a groove bottom wall (4012). The groove side wall (4011) is in contact with the limiting surface (3221), and the second section ( 323) Opposite to the groove bottom wall (4012) and in contact with the groove side wall (4011), the groove side wall (4011) and the groove bottom wall (4012) are along the first direction, and the groove side wall (4011) at least partially overlaps with the projection of the limiting surface (3221) and the second section (323) on a plane perpendicular to the first direction, so that the isolation plate (40) and the The cover plate (30) is positioned in the first direction (X). 2. The battery module according to claim 1, characterized in that, along the second direction (Y), the second section (323) and the first section (321) are connected to the limiting surface ( 3221) is D ₁ mm, the first direction (X) intersects the second direction (Y); along the first direction (X), the first section ( 321) and the second section (323) have a distance D ₂ mm on the side away from them, which satisfies: 0.025≤D ₁ /D ₂ ≤0.16. 3. The battery module according to claim 2, wherein the battery module satisfies: _{0.2≤D1≤0.5} , and/or, _3≤D2≤8 . 4. The battery module according to claim 1, characterized in that, along the first direction (X), there is an avoidance gap between the second section (323) and the bottom wall (4012) of the groove. (100). 5. The battery module according to claim 1, characterized in that the first section (321), the connecting section (322) and the second section (323) are integrally connected. 6. The battery module according to claim 1, characterized in that the first section (321), the connecting section (322) and the second section (323) are all rotary structures, and the rotary structure The center line of rotation is parallel to the first direction (X). 7. The battery module according to claim 1, wherein the cover body (31) also has an upper surface facing away from the isolation plate (40), and the first section (321) and the connecting section (322) and the second section (323) define a cavity (3201), and the upper surface is provided with a second opening (3202) communicating with the cavity (3201). 8. The battery module according to claim 1, wherein the isolation plate (40) also has a plurality of first receiving grooves (402) on one side facing the first side (311). The engaging grooves (401) have multiple, along the third direction (Z), at least part of the first receiving grooves (402) and at least part of the engaging grooves (401) are alternately arranged; The battery module also includes: A plurality of bus bars (50) are arranged in a plurality of first accommodation slots (402) in one-to-one correspondence, and a plurality of the bus bars (50) are connected in series with a plurality of single cells. 9. The battery module according to claim 1, wherein the isolation plate (40) also has a second receiving groove (403) on one side facing the first side (311); The isolation plate (40) is also provided with a positioning post (41); The battery module also includes: The FPC board (60) is located in the second accommodation groove (403). The FPC board (60) is provided with a positioning hole (601) penetrating along the first direction (X); the positioning post (41 ) is inserted through the positioning hole (601). 10. A battery pack, characterized in that it includes: box; The battery module according to any one of claims 1 to 9, wherein the battery module is installed in the box.