Battery pack and electric equipment

Abstract

The utility model provides a battery pack and electric equipment. The battery pack comprises a plurality of battery cell units arranged in an arrayed manner and a sampling plate, and the sampling plate is laid above the battery cell units and electrically connected with tabs of the battery cell units through sampling terminals so as to collect voltage and / or temperature; a wiring seat is arranged on the sampling plate, a wiring cable is inserted into the wiring seat, a plurality of air guide holes are further formed in the sampling plate, and at least part of the air guide holes are formed around the wiring seat. According to the battery pack provided by the invention, through the structural arrangement, the exhaust performance in the glue filling process can be enhanced, and the problem that the protectiveness of the tabs and the sealing performance of the battery pack are affected due to the fact that an air cavity is formed between the circuit board and the glue filling cover in the glue filling process is solved.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery pack and an electrical device including the battery pack. Background Technology

[0002] A battery pack typically consists of one or two cell modules, each containing multiple cell units with their tabs connected in series or parallel. Because the tabs are thin and flexible, adhesive is usually injected into them during manufacturing to protect them. Once the adhesive solidifies, it forms a protective block around each tab. During the injection process, a cap-like component (referred to as the "injection cap" in this document) is first used to cover the tabs and the circuit board above them, creating an injection space. The cell is then inverted before injection, and the adhesive flows in from the side of the circuit board furthest from the injection cap, filling the space between the circuit board and the cap, eventually filling the entire injection space. However, due to the uneven surface of the circuit board and the essentially sealed space between the circuit board and the injection cap, some air pockets remain on the side of the circuit board facing the injection cap during the adhesive flow, affecting the protection of the tabs and the battery pack's seal. Utility Model Content

[0003] In view of this, this application aims to provide a battery pack that, through structural design, can enhance the venting performance during the potting process, in order to solve the problem that air cavities are formed between the circuit board and the potting cap during the potting process, affecting the protection of the tabs and the sealing of the battery pack.

[0004] This application provides a battery pack, including a plurality of arranged battery cell units and a sampling board. The sampling board is laid on top of each of the battery cell units and is electrically connected to the tabs of each of the battery cell units through sampling terminals to collect voltage and / or temperature.

[0005] The sampling plate is provided with a terminal block, and a wiring cable is plugged into the terminal block. The sampling plate is also provided with multiple air guide holes, and at least some of the air guide holes are arranged around the terminal block.

[0006] In one possible implementation, the terminal block includes a main body and an outward protrusion extending from one side of the main body; some of the air vents are arranged circumferentially along the outward protrusion.

[0007] In one possible implementation, the sampling plate includes a central portion and exhaust holes located on both sides of the central portion in a first direction;

[0008] The terminal block is located on the middle part, and each of the air guide holes arranged around the terminal block is located between the edge area of ​​the middle part and the terminal block.

[0009] In one possible implementation, a first gap space is provided between two adjacent cell units in the second direction, the first gap space being partially filled with foam and having exhaust channels formed on both sides of the foam in the first direction.

[0010] The projection of the exhaust port in the height direction partially overlaps with at least one of the exhaust channels.

[0011] In one possible implementation, the tabs of two adjacent battery cells in the second direction are connected by a connecting bar, and the acquisition end of the sampling terminal is connected to the connecting bar;

[0012] The projection of the exhaust port in the height direction covers at least two of the connecting rows and a second gap space located between the two connecting rows;

[0013] The second gap is opposite to one of the exhaust passages.

[0014] In one possible implementation, multiple sampling terminals are provided on both sides of the edge region of the middle portion in the first direction, and the partial air guide hole is located near the connection end of the multiple sampling terminals that is connected to the sampling plate.

[0015] In one possible implementation, each of the plurality of sampling terminals is provided with at least one of the air guide holes at its connection end.

[0016] In one possible implementation, the connection end of the sampling terminal has a bent portion for inserting into the sampling plate, and the air guide hole corresponding to the connection end is located near one or both of the bent portions.

[0017] In one possible implementation, the sampling plate includes:

[0018] The middle part;

[0019] A sampling section is located on both sides of the middle section in a first direction and is spaced apart from the middle section, and the sampling section is provided with a plurality of sampling terminals arranged along the second direction;

[0020] A connecting portion extends along the first direction and connects the sampling plate body and the intermediate portion;

[0021] An outer portion extends along the first direction and is located on the side of the sampling portion away from the middle portion;

[0022] The connecting part, the sampling part, and the intermediate part together form the exhaust hole.

[0023] In one possible implementation, the diameter of the air guide hole is 1.5-3.5 mm;

[0024] And / or, the minimum distance between the center of the air guide hole and the connection end of the sampling terminal is 2-4 mm;

[0025] And / or, the vertical distance from the center of the air vent to the terminal block is 6-10 mm.

[0026] This application also provides an electrical device including the battery pack described in any of the above claims.

[0027] The battery pack provided in this application has a circuit board, namely a sampling board, above the tabs for collecting information. The sampling board has a connector that protrudes from the board body and is used to connect to the BMS control board circuitry. Simultaneously, the sampling board has multiple vent holes, with at least some of these holes surrounding the connector protruding from the board body. This design allows air to escape from the space between the sampling board and the potting cap during potting, through the vent holes into the battery pack, and then through the gaps and spaces between the cell units. This enhances the venting performance of the space between the sampling board and the potting cap during potting, preventing the formation of large air cavities. Furthermore, since at least some of the vent holes surround the connector protruding from the board body, air at the connector is guaranteed to escape. No air bubbles or air cavities will form in uneven areas such as the corners where the connector meets the board body or in recesses / corners on its circumference. This effectively solves the problem of air cavities forming between the circuit board and the potting cap during potting, which affects the protection of the tabs and the sealing of the battery pack. Attached Figure Description

[0028] Figure 1 The diagram shown is a structural schematic of the sampling board and the battery cell at a first angle in an embodiment of this application.

[0029] Figure 2 The diagram shown is a structural schematic of the sampling board and the battery cell at a second angle in an embodiment of this application;

[0030] Figure 3 The diagram shown is a schematic representation of the first angle of the sampling plate in an embodiment of this application.

[0031] Figure 4 The diagram shown is a schematic representation of the second angle of the sampling plate in an embodiment of this application.

[0032] Figures 1-4 middle:

[0033] 1. Battery cell; 11. Battery cell unit; 12. Connecting bar; 101. First compartment space; 102. Exhaust channel; 103. Second compartment space;

[0034] 2. Sampling plate; 21. Middle section; 22. Sampling section; 23. Connecting section; 24. External connection section; 201. Air guide hole; 202. Exhaust hole; 203. First notch; 204. Second notch;

[0035] 3. Sampling terminal; 31. Connecting end; 311. Bending part;

[0036] 4. Terminal block; 41. Main body; 42. Outward protrusion; 5. Foam. Detailed Implementation

[0037] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0038] Please refer to the attached document. Figures 1-4 This application provides a battery pack comprising multiple arranged battery cell units 11 and a sampling board 2. The sampling board 2 is a circuit board for collecting information such as voltage and temperature. The sampling board 2 is laid on top of each battery cell unit 11 and is electrically connected to the tabs of each battery cell unit 11 through sampling terminals 3 to collect voltage and / or temperature. A terminal block 4 is provided on the sampling board 2. Each sampling terminal 3 is electrically connected to the terminal block 4 through a line located inside the sampling board 2 body. A wiring cable is inserted into the terminal block 4 and electrically connected to a control board through the wiring cable. At the same time, the sampling board 2 is also provided with multiple vent holes 201, at least some of which are arranged around the terminal block 4.

[0039] When the sampling plate 2 and each tab are sealed with the glue-filling cap, and then the battery cell 1 is inverted and glue is applied, the thick glue liquid is poured in from the side of the sampling plate 2 away from the glue-filling cap. It will also slowly flow through the gap between the sampling plate 2 and the glue-filling cap into the space between the sampling plate 2 and the glue-filling cap and fill that space. As the glue liquid flows into this space, the residual air in this space can be discharged to the other side of the sampling plate 2, i.e., the inside of the battery pack, through the vent 201 on the sampling plate 2, and then discharged to the outside of the battery through the gaps and spacing between the battery cell units 11. In other words, the vent 201 adds multiple venting pathways to the space between the sampling plate 2 and the glue-filling cap, enhancing the venting performance of the space between the sampling plate 2 and the glue-filling cap during the glue-filling process. Compared to the prior art where thick glue flows into the space between the sampling plate 2 and the glue-filling cap and blocks the gap, preventing all the air in the space from being expelled, this application, by opening the vent 201 on the sampling plate 2, can avoid residual air in the space between the sampling plate 2 and the glue-filling cap, and prevent the glue from having a large air cavity in the glue after solidification, which would affect the counter electrode tab. The protection and sealing of the battery pack are improved; and since at least part of the air vents 201 are arranged around the terminal block 4 protruding from the board body, air near the terminal block 4 can definitely be discharged, improving the exhaust performance of the parts that protrude significantly from the sampling board 2. This ensures that no air cavities or air chambers are generated in uneven areas such as the corner area where the terminal block 4 connects to the board body or the recessed / corner area in its circumferential direction, thereby improving the density of the solidified glue and effectively solving the problem that air chambers are formed between the circuit board and the glue cap during the glue potting process, which affects the protection of the tabs and the sealing of the battery pack.

[0040] The terminal block 4 includes a main body 41 and an outwardly protruding portion 42 extending from one side of the main body 41. Some vent holes 201 are located near the outwardly protruding portion 42, such as arranged circumferentially along the outwardly protruding portion 42. This enhances the venting performance near the terminal block 4, prevents residual air in the corner area where the outwardly protruding portion 42 connects to the main body 41 during the potting process, thus avoiding cavitation in the solidified adhesive, improving the compactness and density uniformity of the adhesive, and enhancing the protection performance for the tabs.

[0041] The battery pack's cell 1 includes two sets of cell modules arranged along a first direction, each cell module including multiple cell units 11 arranged along a second direction. A central heat sink is provided between the two cell modules. The sampling plate 2 includes a central portion 21 located above the central heat sink, and the terminal block 4 is located in the central portion 21 of the sampling plate 2, positioned in the middle of the sampling plate 2, so that the distance from the terminal block 4 to the two cell modules is the same. This reduces the voltage division effect of the operating current during the acquisition process and avoids affecting the sampling accuracy of the individual cell voltages located on both sides of the terminal block 4.

[0042] In the second direction, the tabs of two adjacent battery cell units 11 are connected by a connecting strip 12. For example, the positive tab of one battery cell unit 11 and the negative tab of another battery cell unit 11 are both connected to the same connecting strip 12. In this way, the tabs of each battery cell unit 11 are connected sequentially through the connecting strip 12, completing the series connection of the circuits of each battery cell unit 11. The acquisition end of the sampling terminal 3 is connected to the connecting strip 12 to acquire information such as voltage. When there are two battery cell modules, four columns of sampling terminals 3 are arranged along the first direction, and each column has multiple sampling terminals 3 arranged along the second direction.

[0043] like Figure 3 As shown, in some embodiments, the sampling plate 2 includes a central portion 21 and vent holes 202 located on both sides of the central portion 21 in a first direction; the terminal block 4 is located on the central portion 21, and each vent hole 201 arranged around the terminal block 4 is located between the edge area of ​​the central portion 21 and the terminal block 4. With this arrangement, the sampling plate 2 not only has multiple vent holes 201, but also vent holes 202. The large hollow area not only reduces the weight of the sampling plate 2, which is beneficial for reducing the overall weight of the battery pack and saving costs, but also increases the ventilation between the sampling plate 2 and the glue-filling cap and the outside world. During glue filling, not only can the glue flow into this space quickly, accelerating the glue filling efficiency, but it also enhances the venting performance, which can better expel the air in the space and more effectively prevent the formation of air cavities or air pockets due to residual air.

[0044] For example, such as Figure 3 As shown, the sampling plate 2 includes a middle part 21, a sampling part 22, and a connecting part 23. The middle part 21 carries the terminal block 4, etc. The sampling part 22 is located on both sides of the middle part 21 in a first direction and has a distance between it and the middle part 21. The sampling part 22 extends along a second direction and is provided with a plurality of sampling terminals 3 arranged in two directions. The connecting part 23 extends along the first direction and connects the sampling part 22 and the middle part 21. There are two connecting parts 23 in the second direction, and the two connecting parts 23, the middle part 21 and the sampling part 22 form a vent 202.

[0045] Both connecting portions 23 may be located at the edge of the sampling plate 2 in the second direction, or one of the connecting portions 23 may be located in the region inward of the edge. For example, a first notch 203 located at the edge of the sampling plate 2 in the second direction may be provided between one connecting portion 23 and the sampling portion 22 and the intermediate portion 21. Alternatively, the sampling plate 2 may have a first notch 203 at its edge in the second direction, which is enclosed by the connecting portion 23, the sampling portion 22, and the intermediate portion 21.

[0046] In some embodiments, the sampling plate 2 further includes an external portion 24, which extends along a first direction and is located on the side of the sampling portion 22 away from the intermediate portion 21. The two external portions 24 are respectively used to set the total positive and total negative terminals of the battery cell 1, such as... Figure 1 As shown. Both external portions 24 can be located at the edge of the sampling plate 2 in the second direction, forming a second notch 204 between them and the sampling portion 22. Alternatively, the sampling plate 2 has a second notch 204 at both ends in the first direction, and the second notch 204 is surrounded by the external portions 24 and the sampling portion 22.

[0047] The sampling plate 2 is located within the projection of the battery cell 1 in the height direction. The vent 202, first notch 203, and second notch 204 all expose the tabs and connecting strips 12 of multiple battery cell units 11. Two of the four rows of sampling terminals 3 are located on the edge areas on both sides of the middle section 21 in the first direction, and the remaining two rows are located on the two sampling sections 22. That is, there is one row of sampling terminals 3 on each side of the edge areas on both sides of the middle section 21 in the first direction, and there is also one row of sampling terminals 3 on each of the two sampling sections 22. The sampling terminals 3 on the middle section 21 can be connected to the connecting strip 12 through the vent 202 and the first notch 203, and the sampling terminals 3 on the sampling sections 22 can be connected to the connecting strip 12 through the second notch 204.

[0048] The size, location, and number of vent holes 202 can be set according to specific requirements. For example, such as... Figure 1 As shown, there is a first gap space 101 between two adjacent battery cells 11 in the second direction. The first gap space 101 is partially filled with foam and exhaust channels 102 are formed on both sides of the foam in the first direction. That is, the first gap space 101 is only partially filled with foam, while the foam leaves space on both sides in the first direction to form exhaust channels 102. The projection of the exhaust hole 202 in the height direction overlaps with at least one exhaust channel 102 in a partial manner. Thus, the vent 202 on the sampling plate 2 will be directly opposite and connected to at least one vent channel 102. This structural arrangement will further enhance the ventilation and exhaust performance of the space between the sampling plate 2 and the glue filling cap. During glue filling, the glue can not only flow down from the gap between the sampling plate 2 and the glue filling cap into the space between them, but also be poured into the space from the vent 202, which can enhance the glue filling efficiency. At the same time, the air in the space can also be discharged from the vent 202 when the vent 202 is not completely sealed by the glue, which enhances the speed and smoothness of exhaust and further ensures that the space will not form large air pockets and air cavities.

[0049] In some embodiments, the projection of the exhaust port 202 in the height direction covers at least two connecting rows 12 and a second gap space 103 located between the two connecting rows 12; the second gap space 103 is opposite to an exhaust channel 102, such as Figure 2As shown, the second interval space 103 is located above and communicates with the first interval space 101. In the height direction, it is opposite to a portion of the foam 6 in the first interval space 101 and the venting channel 102 near the middle part 21 (opposite means that the projections in the height direction at least partially overlap). Thus, the size of the venting hole 202 in the second direction is equivalent to that of five battery cell units 11. The large size makes the sampling plate 2 a large hollow structure, which not only facilitates processing but also more effectively enhances the venting performance during the potting process.

[0050] Meanwhile, at least some of the two rows of sampling terminals 3 on the middle part 21 will pass through the vent 202 to the bottom of the sampling plate 2 and connect to the tabs or connecting strip 12. The larger the size of the vent 202 and the larger the opening range, the more battery cells 11 it covers or can expose, and the more sampling terminals 3 can be connected to the connecting strip 12 through the same vent 202.

[0051] On the middle section 21, each air guide hole 201 arranged around the terminal block 4 is located near multiple sampling terminals 3 on both sides of the middle section 21 edge area. Specifically, it is located near the connection end 31 of the terminal block 4 that connects to the sampling plate 2. For example, each sampling terminal 3 on the middle section 21 has at least one air guide hole 201 at its connection end 31. One end of the sampling terminal 3 is the connection end 31 that connects to the sampling plate 2, and the other end is the collection end that connects to the electrode tab. The sampling terminal 3 is usually a metal sheet such as a nickel sheet. The connection with the sampling plate 2 is usually achieved by setting a bent part 311 at the end, which is inserted into the sampling plate 2 and welded to the sampling plate 2. On the one hand, the connection end 31 of the sampling terminal 3 may protrude partially from the surface of the sampling plate 2. During the potting process, air cavitation is easily generated near the connection end 31 of the sampling terminal 3. On the other hand, the high-temperature welding generates large stress, which may cause deformation of the sampling plate 2. The connection end 31 of the sampling terminal 3 may be damaged by stress compression. Therefore, one or two air vents 201 are arranged at the connection end 31 of each sampling terminal 3. This not only enhances the venting at the connection end 31 of the sampling terminal 3 and prevents cavitation during the potting process, but also reduces at least part of the welding stress, enhances the protection of the sampling terminal 3, and improves the quality of the sampling board 2.

[0052] Specifically, the connection end 31 of the sampling terminal 3 has bends 311 for inserting the sampling plate 2 on three sides in the circumferential direction, and the air guide hole 201 of the connection end 31 is located near one or two of the bends 311. For example, as Figure 3 and Figure 4 As shown, the air vent 201 near the connection end 31 is located on one side of a bend 311 or between two bends 311.

[0053] In some embodiments, the minimum distance between the center of the air guide hole 201 and the connection end 31 of the sampling terminal 3 is 2-4 mm, such as 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, etc. Both the air guide hole 201 and the slot on the plate for the bending portion 311 to be inserted are notches. If the air guide hole 201 is too close to the sampling terminal 3, it will affect the hardness of this area of ​​the sampling plate 2, making it prone to breakage.

[0054] If the diameter of the air guide hole 201 is too small, it will be difficult to process and will also affect the exhaust performance; if the air guide hole 201 is too large, setting the air guide hole 201 around the terminal block 4 will occupy more board space and affect the arrangement of the wiring connecting the terminal block 4 and the sampling terminal 3 inside the board. In some embodiments, the diameter of the air guide hole 201 is 1.5-3.5 mm, for example, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, etc.

[0055] In some embodiments, the vertical distance from the center of the vent 201 to the terminal block 4 is 6-10 mm. If the vent 201 is too far from the terminal block 4, it will affect the venting performance of the outer corner area of ​​the terminal block 4. If the distance is too close, it will be too far from the sampling terminal 3, which will also affect the routing and layout of the circuit inside the board.

[0056] This application also provides an electrical device that includes the battery pack described in any of the above embodiments. This electrical device then possesses the aforementioned beneficial effects, which will not be elaborated further here.

[0057] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0058] The components and devices described in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the accompanying drawings. As those skilled in the art will recognize, these components and devices can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the words “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0059] It should also be noted that in the apparatus and equipment of this application, the components can be disassembled and / or reassembled. These disassemblies and / or reassemblies should be considered as equivalent solutions of this application.

[0060] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0061] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

[0062] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications or equivalent substitutions made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery pack, characterized in that, Includes multiple battery cell units and sampling boards arranged in an array. The sampling plate is laid on top of each of the battery cells and is electrically connected to the tabs of each of the battery cells through sampling terminals to collect voltage and / or temperature. The sampling plate is provided with a terminal block, and a wiring cable is plugged into the terminal block. The sampling plate is also provided with multiple air guide holes, and at least some of the air guide holes are arranged around the terminal block.

2. The battery pack as described in claim 1, characterized in that, The terminal block includes a main body and an outward protrusion extending from one side of the main body; some of the air guide holes are arranged circumferentially along the outward protrusion.

3. The battery pack as described in claim 1, characterized in that, The sampling plate includes a middle section and exhaust holes located on both sides of the middle section in a first direction; The terminal block is located on the middle part, and each of the air guide holes arranged around the terminal block is located between the edge area of ​​the middle part and the terminal block.

4. The battery pack as described in claim 3, characterized in that, There is a first gap space between two adjacent battery cells in the second direction, and the first gap space is partially filled with foam and has exhaust channels on both sides of the foam in the first direction. The projection of the exhaust port in the height direction partially overlaps with at least one of the exhaust channels.

5. The battery pack as described in claim 4, characterized in that, The tabs of two adjacent battery cells in the second direction are connected by a connecting strip, and the sampling terminal is connected to the connecting strip; The projection of the exhaust port in the height direction covers at least two of the connecting rows and a second gap space located between the two connecting rows; The second gap is opposite to one of the exhaust passages.

6. The battery pack as described in claim 3, characterized in that, Multiple sampling terminals are provided on both sides of the edge area of ​​the middle part in the first direction, and the partial air guide hole is located near the connection end of the multiple sampling terminals that is connected to the sampling plate.

7. The battery pack as described in claim 6, characterized in that, Each of the plurality of sampling terminals has at least one air guide hole at its connection end.

8. The battery pack as described in claim 7, characterized in that, The connecting end of the sampling terminal has a bent portion that inserts into the sampling plate, and the air guide hole corresponding to the connecting end is located near one or two of the bent portions.

9. The battery pack as described in claim 3, characterized in that, The sampling plate includes: The middle part; The sampling section is located on both sides of the middle section in a first direction and has a distance from the middle section, and the sampling section is provided with a plurality of sampling terminals arranged in a second direction; A connecting portion extends along the first direction and connects the sampling plate body and the intermediate portion; An outer portion extends along the first direction and is located on the side of the sampling portion away from the middle portion; The connecting part, the sampling part, and the intermediate part together form the exhaust hole.

10. The battery pack as claimed in claim 4, characterized in that, The diameter of the air guide hole is 1.5-3.5 mm; And / or, the minimum distance between the center of the air guide hole and the connection end of the sampling terminal is 2-4 mm; And / or, the vertical distance from the center of the air vent to the terminal block is 6-10 mm.

11. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1-10.

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