Battery pack and electric equipment

Abstract

The utility model relates to a battery pack and electric equipment, and relates to the technical field of batteries, the battery pack comprises a plurality of battery cells, a plurality of busbars and a heat exchange plate, the plurality of battery cells are arranged along a first direction; each busbar comprises a first connecting part, a transition part and a second connecting part which are connected in sequence, in every two adjacent battery cells, at least part of the first connecting part is connected with the pole of one battery cell, at least part of the second connecting part is connected with the pole of the other battery cell, and the transition part is located between the poles of every two adjacent battery cells; the heat exchange plate covers the first connecting parts and the second connecting parts of the plurality of busbars; the sum of the lengths of the first connecting part and the second connecting part in the first direction is a, the length of the transition part in the first direction is b, and a and b meet the condition that b / a is smaller than 10%. According to the battery pack and the electric equipment, the contact area of the busbar and the heat exchange plate can be increased, so that the heat exchange area is increased, and the cooling effect is improved.

Description

Technical Field

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

[0002] During the operation of a battery, current is transmitted between battery cells through a bus bar. When current passes through the bus bar, it generates heat and causes the temperature to rise. In related technologies, a heat exchange plate is usually covered on the bus bar, and the heat exchange plate can cool the bus bar. However, in related technologies, the contact area between the bus bar and the heat exchange plate is small, the heat exchange area is small, and the cooling effect is poor, which easily leads to a relatively high temperature of the bus bar and causes safety accidents. Utility Model Content

[0003] To solve the above technical problems, embodiments of this application provide a battery pack and an electrical device, which can increase the contact area between the bus bar and the heat exchange plate, thereby increasing the heat exchange area, improving the cooling effect, keeping the temperature of the bus bar within a normal range during operation, and avoiding safety accidents.

[0004] In a first aspect, a battery pack is provided, including:

[0005] A plurality of battery cells arranged along a first direction;

[0006] A plurality of bus bars, each bus bar including a first connection portion, a transition portion, and a second connection portion connected in sequence. Among two adjacent battery cells, at least part of the first connection portion is connected to the terminal of one of the battery cells, at least part of the second connection portion is connected to the terminal of the other battery cell, and the transition portion is located between the terminals of the two adjacent battery cells;

[0007] A heat exchange plate covering the first connection portions and the second connection portions of the plurality of bus bars;

[0008] Wherein, the sum of the lengths of the first connection portion and the second connection portion in the first direction is a, the length of the transition portion in the first direction is b, and a and b satisfy: b / a < 10%.

[0009] According to the first aspect of this application, the area of the surface of the heat exchange plate close to the bus bar is c, and the surface area of the plurality of first connection portions and the plurality of second connection portions is d, and c and d satisfy: d / c > 80%.

[0010] According to the first aspect of this application, an accommodation cavity is formed between the bus bar and the top cover of the battery cell;

[0011] The battery pack further includes:

[0012] A circuit board assembly is disposed in the accommodation cavity, and the circuit board assembly is attached to the bus bar.

[0013] According to the first aspect of the present application, the circuit board assembly includes:

[0014] An FPC is attached to the bus bar;

[0015] A connecting piece, with both ends of the connecting piece respectively connecting the FPC and the bus bar.

[0016] According to the first aspect of the present application, a part of the connecting piece is bent to form a first side surface and a second side surface on non - coplanar planes. The first side surface is attached to the FPC, and the second side surface is attached to the bus bar.

[0017] According to the first aspect of the present application, the battery pack further includes:

[0018] A temperature acquisition component is disposed in the accommodation cavity. The temperature acquisition component is connected to the FPC and is attached to the top cover of the battery cell.

[0019] According to the first aspect of the present application, the battery pack further includes:

[0020] A first support member is disposed between the heat exchange plate and the circuit board assembly. Opposite sides of the first support member are respectively attached to the heat exchange plate and the circuit board assembly.

[0021] According to the first aspect of the present application, the battery pack further includes:

[0022] A second support member is disposed between the circuit board assembly and the top cover of the battery cell. Opposite sides of the second support member are respectively attached to the circuit board assembly and the top cover of the battery cell;

[0023] Wherein, the projection of a part of each bus bar on the surface of the second support member is within the boundary range of the second support member.

[0024] According to the first aspect of the present application, an insulating heat conductor is provided between the heat exchange plate and the plurality of bus bars.

[0025] In a second aspect, an electrical device is further provided, including the battery pack described in the previous embodiment.

[0026] The battery pack and the electrical device provided by the embodiments of the present application can effectively increase the contact area between the bus bar and the heat exchange plate, thereby increasing the heat exchange area and improving the cooling effect, by increasing the overall proportion of the first connecting portion and the second connecting portion in the bus bar. That is, the sum of the lengths of the first connecting portion and the second connecting portion in the first direction is a, and the length of the transition portion in the first direction is b, and a and b satisfy: b / a < 10%, so that the temperature of the bus bar during operation can be maintained within the normal range and safety accidents can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] By describing the embodiments of the present application in more detail in conjunction with the accompanying drawings, the above and other objects, features, and advantages of the present application will become more obvious. The accompanying drawings are used to provide a further understanding of the embodiments of the present application, and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation to the present application. In the accompanying drawings, the same reference numerals generally represent the same components or steps.

[0028] Figure 1 FIG. 9 is a schematic structural diagram of a battery pack provided by an exemplary embodiment of the present application from a first perspective.

[0029] Figure 2 FIG. 13 is a schematic structural diagram of a battery pack provided by an exemplary embodiment of the present application from a second perspective.

[0030] Figure 3 is Figure 2 an enlarged schematic view of the H position in

[0031] Figure 4 FIG. 23 is an exploded schematic view of a battery pack provided by an exemplary embodiment of the present application.

[0032] Figure 5 FIG. 27 is a schematic structural diagram of a bus bar provided by an exemplary embodiment of the present application.

[0033] Figure 6 FIG. 31 is a schematic structural diagram of a circuit board assembly and a temperature acquisition component provided by an exemplary embodiment of the present application.

[0034] Figure 7 FIG. 35 is a schematic structural diagram of a connecting piece provided by an exemplary embodiment of the present application.

[0035] Reference numerals: 100 - battery pack; 110 - battery cell; 120 - bus bar; 121 - first connecting portion; 122 - second connecting portion; 123 - transition portion; 130 - heat exchange plate; 140 - accommodation cavity; 150 - circuit board assembly; 151 - FPC; 152 - connecting piece; 1521 - first side; 1522 - second side; 170 - temperature acquisition component; 180 - first support member; 190 - second support member; 200 - insulating heat conductor. Detailed Implementation Modes

[0036] Next, exemplary embodiments according to the present application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. It should be understood that the present application is not limited by the exemplary embodiments described herein.

[0037] Figure 1 FIG. 7 is a schematic structural diagram of a battery pack provided in an exemplary embodiment of the present application from a first perspective. Figure 2 FIG. 8 is a schematic structural diagram of a battery pack provided in an exemplary embodiment of the present application from a second perspective. Figure 3 is Figure 2 an enlarged schematic view of the position H in FIG. Figure 4 FIG. 15 is an exploded schematic diagram of a battery pack provided in an exemplary embodiment of the present application. As Figures 1 to 4 shown, the battery pack 100 provided in the embodiment of the present application may include a plurality of battery cells 110 and a plurality of busbars 120. The plurality of battery cells 110 are arranged along a first direction ( Figure 1 the directions indicated by the arrows E and F in FIG. 17), and current is transmitted between two adjacent battery cells 110 in the first direction through the busbar 120.

[0038] Specifically, Figure 5 FIG. 24 is a schematic structural diagram of a busbar provided in an exemplary embodiment of the present application. As Figures 3 to 5 shown, each busbar 120 includes a first connection portion 121, a transition portion 123, and a second connection portion 122 that are sequentially connected. Among two adjacent battery cells 110, at least a part of the first connection portion 121 is connected to the pole of one of the battery cells 110, and at least a part of the second connection portion 122 is connected to the pole of the other battery cell 110. The transition portion 123 is located between the poles of two adjacent battery cells 110. In this way, the first connection portion 121, the transition portion 123, and the second connection portion 122 are used to connect the poles of two adjacent battery cells 110, and the current between two adjacent battery cells 110 can be transmitted through the first connection portion 121, the transition portion 123, and the second connection portion 122.

[0039] It should be understood that heat is generated during the process of the busbar 120 transmitting current, and the temperature will increase accordingly. It is necessary to cool down the busbar 120. For this purpose, in combination with Figures 1 to 5 FIG. 31, the battery pack 100 may further include a heat exchange plate 130. The heat exchange plate 130 covers the first connection portion 121 and the second connection portion 122 of the plurality of busbars 120. In this way, the heat generated when the plurality of busbars 120 work can be transmitted to the heat exchange plate 130 through the first connection portion 121 and the second connection portion 122, and the heat exchange plate 130 absorbs the heat, thereby reducing the temperature of the busbar 120.

[0040] It should be noted that, as Figure 5 shown, the sum of the lengths of the first connecting portion 121 and the second connecting portion 122 in the first direction is a ( Figure 5 where a = a1 + a2 in ), the length of the transition portion 123 in the first direction is b, and a and b satisfy: b / a < 10%. In this way, the overall proportion of the first connecting portion 121 and the second connecting portion 122 in the bus bar 120 can be increased, that is, the contact area between the bus bar 120 and the heat exchange plate 130 can be effectively increased, thereby increasing the heat exchange area and improving the cooling effect, so that the temperature of the bus bar 120 during operation is maintained within the normal range and safety accidents are avoided.

[0041] In one embodiment, the length a1 of the first connecting portion 121 in the first direction and the length a2 of the second connecting portion 122 in the first direction may be equal or unequal.

[0042] It should be noted that the area of the surface of the heat exchange plate 130 close to the bus bar 120 is c, and the surface areas of the plurality of first connecting portions 121 and the plurality of second connecting portions 122 are d, and c and d satisfy: d / c > 80%. That is, the total area of the bus bar 120 in contact with the heat exchange plate 130 for heat exchange accounts for more than 80% of the total area of the surface of the heat exchange plate 130 close to the bus bar 120. In this way, the heat exchange efficiency of the heat exchange plate 130 can be fully utilized and the heat exchange efficiency can be improved.

[0043] As Figure 5 shown, the transition portion 123 is recessed relative to the first connecting portion 121 and the second connecting portion 122. In this way, on the one hand, the recessed area between the pole columns of two adjacent battery cells 110 can be adapted to improve the space utilization rate; on the other hand, when the first connecting portion 121 and the second connecting portion 122 are in contact with the heat exchange plate 130, there is a certain gap between the transition portion 123 and the heat exchange plate 130, which can avoid excessive heat concentration.

[0044] As Figure 3 and Figure 4 shown, an accommodation cavity 140 is formed between the bus bar 120 and the top cover of the battery cell 110. The battery pack 100 may include a circuit board assembly 150. The circuit board assembly 150 can be used as a connection medium between the battery cell 110 and external electrical components. The circuit board assembly 150 is disposed in the accommodation cavity 140 and the circuit board assembly 150 is attached to the bus bar 120. In this way, not only can the bus bar 120 be used to limit the circuit board assembly 150, but also the space between the bus bar 120 and the top cover of the battery cell 110 can be fully utilized to improve the space utilization rate of the battery pack 100 in the height direction.

[0045] It should be noted that the heat generated when the circuit board assembly 150 works can also be transferred to the heat exchange plate 130 through the bus bar 120, that is, the heat exchange plate 130 can also cool down the circuit board assembly 150.

[0046] Figure 6 The structural schematic diagram of the circuit board assembly and the temperature acquisition component provided by an exemplary embodiment of the present application. As Figure 3 、 Figure 4 and Figure 6 shown, the circuit board assembly 150 may include an FPC 151 (flexible printed circuit board) and a connecting piece 152. The FPC 151 is attached to the bus bar 120. The two ends of the connecting piece 152 are respectively connected to the FPC 151 and the bus bar 120. In this way, on the one hand, the connecting piece 152 can transmit current signals between the FPC 151 and the bus bar 120; on the other hand, the connecting piece 152 can enhance the connection strength between the FPC 151 and the bus bar 120 and improve the overall stability.

[0047] In one embodiment, the connecting piece 152 can be selected from nickel sheets, copper sheets, etc.

[0048] Figure 7 The structural schematic diagram of the connecting piece provided by an exemplary embodiment of the present application. As Figure 3 、 Figure 6 and Figure 7 shown, a part of the connecting piece 152 is bent, so that a first side surface 1521 and a second side surface 1522 on non - coplanar planes can be formed. The first side surface 1521 is attached to the FPC 151, and the second side surface 1522 is attached to the bus bar 120. Combining Figure 3 and Figure 5 , since the space between the bus bar 120 and the top of the battery cell 110 is limited, bending a part of the connecting piece 152 can better adapt to the layout structure between the bus bar 120 and the top wall of the battery cell 110, achieve good connection in a limited space, avoid interference with other components, effectively improve the space utilization rate, and make the overall structure of the battery pack 100 more compact.

[0049] As Figure 3 and Figure 6 shown, the battery pack 100 may further include a temperature acquisition component 170. The temperature acquisition component 170 is arranged in the accommodation cavity 140. The temperature acquisition component 170 is connected to the FPC 151. The temperature acquisition component 170 is attached to the top cover of the battery cell 110. The temperature acquisition component 170 can be used to detect the temperature of the top cover of the battery cell 110.

[0050] As Figure 6As shown, in one example, the temperature acquisition component 170 and the connection piece 152 are arranged on the same side of the FPC 151. In this way, on the one hand, it is convenient for the temperature acquisition component 170 to be attached to the top cover of the battery cell 110; on the other hand, compared with the direction where the temperature acquisition component 170 and the connection piece 152 are respectively arranged on the opposite sides of the FPC 151, the space occupied by the temperature acquisition component 170, the connection piece 152, and the FPC 151 in the height direction of the battery pack 100 can be saved, effectively improving the space utilization rate.

[0051] As Figure 3 and Figure 4 shown, the battery pack 100 may further include a first support member 180. The first support member 180 is arranged between the heat exchange plate 130 and the circuit board assembly 150. The opposite sides of the first support member 180 are respectively attached to the heat exchange plate 130 and the circuit board assembly 150. Since the main body of the circuit board assembly 150 is a flexible circuit board, the first support member 180 can provide support for the circuit board assembly 150, effectively improving the assembly stability of the circuit board assembly 150.

[0052] In one embodiment, the first support member 180 is made of an insulating material.

[0053] As Figure 3 and Figure 4 shown, the battery pack 100 may further include a second support member 190. The second support member 190 is arranged between the circuit board assembly 150 and the top cover of the battery cell 110. The opposite sides of the second support member 190 are respectively attached to the circuit board assembly 150 and the top cover of the battery cell 110. In this way, the second support member 190 can support the circuit board assembly 150 and improve the assembly stability of the circuit board assembly 150.

[0054] Combined with Figure 3 , it should be noted that the projection of a part of each bus bar 120 on the surface of the second support member 190 is within the boundary range of the second support member 190. In this way, the second support member 190 can also support the multiple bus bars 120 and prevent the multiple bus bars 120 from bending the circuit board assembly 150.

[0055] In one embodiment, the second support member 190 is made of an insulating material.

[0056] As Figure 3 described, an insulating heat conductor 200 is arranged between the heat exchange plate 130 and the multiple bus bars 120. On the one hand, the insulating heat conductor 200 can transfer the heat generated by the bus bars 120 to the heat exchange plate 130 to assist the heat exchange plate 130 in cooling the bus bars 120; on the other hand, the insulating heat conductor 200 can block the power connection between the heat exchange plate 130 and the multiple bus bars 120 to avoid short - circuit situations.

[0057] In one embodiment, the insulating heat conductor 200 is a heat-conducting adhesive, which can be adhered between the heat exchange plate 130 and the plurality of busbars 120, and its connection structure is more stable and reliable.

[0058] The embodiment of the present application also provides an electrical device, which includes the battery pack 100 described in the previous embodiment, and has all the functions and all the beneficial effects of the battery pack 100.

[0059] In one embodiment, the electrical device includes the above-mentioned battery pack and can be powered by the above-mentioned battery pack. Among them, the above-mentioned electrical device can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, an energy storage device, a amusement device, an elevator and a lifting device, etc. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or an extended-range electric vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle and a spaceship, etc.; the electric toy includes a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy or an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and a railway electric tool, for example, an electric drill, an electric grinding wheel, an electric wrench, an electric screwdriver, a hammer drill, an impact electric drill, a concrete vibrator and a planer, etc.; the energy storage device can be an energy storage wall, a base station energy storage, a container energy storage, etc.; the amusement device can be a carousel, a drop tower, etc. The present application does not make special restrictions on the above-mentioned electrical devices.

[0060] The basic principles of the present application have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, advantages, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, advantages, effects, etc. are essential for each embodiment of the present application. In addition, the above-disclosed specific details are only for the purposes of illustration and easy understanding, rather than limitations. The above details do not limit the present application to necessarily adopt the above specific details to implement.

[0061] The block diagrams of the devices, apparatuses, equipment, and systems involved in the present application are only illustrative examples and do not intend to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open-ended words, meaning "including but not limited to", and can be used interchangeably with each other. The words "or" and "and" used herein refer to the word "and / or", and can be used interchangeably with each other, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to", and can be used interchangeably with each other.

[0062] It should also be noted that in the devices, equipment and methods of the present application, each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent solutions of the present application.

[0063] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present 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 the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0064] The above description has been presented for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of the present application to the form disclosed herein. Although several example aspects and embodiments have been discussed above, those skilled in the art will recognize some of their variations, modifications, alterations, additions, and sub-combinations.

Claims

1. A battery pack, characterized in that, Comprising: A plurality of battery cells (110), the plurality of battery cells (110) being arranged along a first direction; A plurality of busbars (120), each busbar (120) including a first connection portion (121), a transition portion (123), and a second connection portion (122) connected in sequence. Among two adjacent battery cells (110), at least a part of the first connection portion (121) is connected to the terminal of one of the battery cells (110), at least a part of the second connection portion (122) is connected to the terminal of the other battery cell (110), and the transition portion (123) is located between the terminals of the two adjacent battery cells (110); A heat exchange plate (130) covering the first connection portion (121) and the second connection portion (122) of the plurality of busbars (120); Wherein, the sum of the lengths of the first connection portion (121) and the second connection portion (122) in the first direction is a, the length of the transition portion (123) in the first direction is b, and a and b satisfy: b / a < 10%.

2. The battery pack according to claim 1, wherein, The area of the surface of the heat exchange plate (130) close to the busbar (120) is c, and the surface areas of the plurality of first connection portions (121) and the plurality of second connection portions (122) are d, and c and d satisfy: d / c > 80%.

3. The battery pack according to claim 1, wherein, An accommodation cavity (140) is formed between the busbar (120) and the top cover of the battery cell (110); The battery pack further includes: A circuit board assembly (150) disposed in the accommodation cavity (140), and the circuit board assembly (150) is attached to the busbar (120).

4. The battery pack according to claim 3, characterized in that, The circuit board assembly (150) includes: An FPC (151) attached to the busbar (120); A connection piece (152), with both ends of the connection piece (152) connected to the FPC (151) and the busbar (120) respectively.

5. The battery pack according to claim 4, wherein, Part of the connection piece (152) is bent to form a first side surface (1521) and a second side surface (1522) on non - coplanar planes. The first side surface (1521) is attached to the FPC (151), and the second side surface (1522) is attached to the busbar (120).

6. The battery pack according to claim 4, characterized in that, The battery pack further includes: A temperature acquisition component (170) disposed in the accommodation cavity (140), the temperature acquisition component (170) is connected to the FPC (151), and the temperature acquisition component (170) is attached to the top cover of the battery cell (110).

7. The battery pack according to claim 3, characterized in that The battery pack further includes: A first support member (180) disposed between the heat exchange plate (130) and the circuit board assembly (150), and opposite sides of the first support member (180) are respectively attached to the heat exchange plate (130) and the circuit board assembly (150).

8. The battery pack according to claim 3, wherein, The battery pack further includes: A second support member (190) is disposed between the circuit board assembly (150) and the top cover of the battery cell (110), and opposite sides of the second support member (190) are respectively in contact with the circuit board assembly (150) and the top cover of the battery cell (110); Wherein, a projection of a part of each bus bar (120) on the surface of the second support member (190) is located within the boundary range of the second support member (190).

9. The battery pack according to any one of claims 1 to 8, characterized in that, An insulating heat conductor (200) is provided between the heat exchange plate (130) and the plurality of bus bars (120).

10. An electrical device, characterized in that, A battery pack includes the battery pack according to any one of claims 1 to 9.

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