A battery pack and an electrical device

Abstract

This utility model relates to the field of battery technology and discloses a battery pack and an electrical device. The battery pack has three perpendicular directions: a first direction, a second direction, and a third direction. The battery pack includes: a housing with a receiving cavity; battery cells disposed within the receiving cavity and extending along the first direction, each battery cell including multiple individual battery cells arranged along the first direction; multiple battery cells arranged along a second direction; and a top cover at one end of each battery cell along the third direction; a first pressure strip disposed within the receiving cavity, extending along the first direction and connecting the top covers of at least two individual battery cells in the same battery cell; and a second pressure strip disposed within the receiving cavity and spaced apart from the first pressure strip, the second pressure strip being disposed on the top covers of two adjacent battery cells along the second direction. This utility model's battery pack and electrical device improve the overall structural strength and modal characteristics of the pack and effectively prevent the top cover from bursting.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery pack and an electrical device. Background Technology

[0002] Existing technologies sometimes place the explosion-proof valve of a single battery cell at the bottom, while the top cover and terminals remain at the top. When a battery pack integrating multiple cells is installed in a vehicle, thermal runaway of a single cell can cause the explosion-proof valve to open, allowing ejected material to be discharged towards the bottom, away from the passenger compartment, thus avoiding impact on the passenger compartment and effectively improving safety. However, in some cells, the explosion-proof valve may not open sufficiently or may be ruptured, blocking the exhaust channel. This prevents timely removal of gas from inside the cell. Since the top cover of the cell is a relatively weak area, gas can burst through the top cover and eject outwards, potentially causing the top cover to explode. Therefore, the technical solution presented in this application is urgently needed to solve these problems. Utility Model Content

[0003] The purpose of this invention is to provide a battery pack and power supply device that improves the overall structural strength and modal characteristics of the pack, and effectively prevents the top cover from bursting.

[0004] To achieve the above objectives, in a first aspect, this utility model provides a battery pack having two perpendicular directions: a first direction, a second direction, and a third direction, comprising:

[0005] The box-shaped enclosure has a receiving cavity;

[0006] A battery cell is disposed within the receiving cavity and extends along the first direction. The battery cell includes a plurality of battery cells arranged along the first direction. The plurality of battery cells are arranged along the second direction. One end of each battery cell along the third direction has a top cover.

[0007] A first pressure strip is disposed within the receiving cavity, the first pressure strip extending along the first direction and connecting the top covers of at least two battery cells in the same battery unit; and

[0008] The second pressure strip is disposed within the receiving cavity and spaced apart from the first pressure strip. The second pressure strip extends along the first direction and connects two adjacent battery cells. The second pressure strip is disposed on the top cover of two adjacent battery cells along the second direction.

[0009] In some embodiments, a first adhesive layer is further included, the number of first pressure strips is the same as the number of battery cells, and each battery cell is provided with one first pressure strip; each first pressure strip is connected to the top cover through the first adhesive layer.

[0010] In some embodiments, a first sealing layer is further included, which is disposed between the first pressure strip and the top cover, and the first sealing layer is connected to both sides of the first adhesive layer along the second direction.

[0011] In some embodiments, a second adhesive layer is further included, through which the second pressure strip is connected to the top cover.

[0012] In some embodiments, a second sealing layer is further included; there is a gap between two adjacent battery cells in two adjacent battery cells along the second direction, the second sealing layer is disposed between the second pressure strip and the top cover and covers the gap, and the second adhesive layer is located at least on both sides of the second sealing layer along the second direction.

[0013] In some embodiments, if the thickness of the first pressure strip is a and the thickness of the second pressure strip is b, then a < b.

[0014] In some embodiments, the battery cell includes a housing connected to the top cover, the housing having an explosion-proof valve, and the top cover having two terminals.

[0015] In some embodiments, the first pressure strip is disposed between the two terminals of the same battery cell.

[0016] In some embodiments, the housing has a bottom wall, which is disposed opposite to the top cover in the third direction, and the explosion-proof valve is disposed on the bottom wall.

[0017] In a second aspect, this utility model provides an electrical device, including the battery pack described in the first aspect.

[0018] This utility model provides a battery pack and an electrical device, which have the following advantages compared with the prior art:

[0019] The housing has a receiving cavity, in which a battery unit is disposed and extends along a first direction. The battery unit includes multiple battery cells arranged along the first direction. The multiple battery cells are arranged along a second direction. Each battery cell has a top cover at one end along a third direction. A first pressure strip is disposed in the receiving cavity, extending along the first direction and connecting the top covers of at least two battery cells in the same battery unit. A second pressure strip is disposed in the receiving cavity and spaced apart from the first pressure strip. The second pressure strip extends along the first direction and connects two adjacent battery cells. The second pressure strip is disposed on the top covers of two adjacent battery cells along the second direction. Thus, the first pressure strip connects the top covers of each battery cell in the same battery unit, and the second pressure strip connects the top covers of two adjacent battery cells. For each battery cell, mutual fixation with adjacent battery cells in two directions is achieved, thereby improving the overall structural strength and modality, and effectively preventing the top cover from bursting. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the battery pack provided in an embodiment of the present utility model.

[0021] Figure 2 This is a top view of the battery pack provided in an embodiment of the present invention.

[0022] Figure 3 This is an enlarged cross-sectional view of the battery pack along the second direction, provided in an embodiment of the present invention.

[0023] In the diagram: 1. Housing; 11. Receiving cavity; 2. Battery unit; 21. Battery cell; 3. First pressure strip; 4. Second pressure strip; 5. First adhesive layer; 6. First sealing layer; 7. First adhesive layer; 8. Second sealing layer; 22. Shell; 221. Bottom wall; 222. Explosion-proof valve; 23. Top cover; 24. Terminal post; X, First direction; Y, Second direction; Z, Third direction. Detailed Implementation

[0024] The technical solutions in 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.

[0025] It should be understood that in the description of this application, the terms "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used solely for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. That is, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Furthermore, unless otherwise stated, "a plurality of" means two or more.

[0026] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0027] like Figures 1-3 As shown, the battery pack of some embodiments of this utility model has a first direction X, a second direction Y, and a third direction Z that are perpendicular to each other, and includes: a housing 1, a battery unit 2, a first pressure strip 3, and a second pressure strip 4. The battery unit 2 is connected to the first pressure strip 3 and the second pressure strip 4 to improve the strength and modal characteristics of the battery unit 2.

[0028] The housing 1 has a receiving cavity 11. The housing 1 is the main structure constituting the outer shell of the battery pack, providing mechanical support, protection, and heat dissipation. The receiving cavity 11 provides the mounting base and environment for the battery unit 2, the first pressure strip 3, and the second pressure strip 4.

[0029] The battery unit 2 is disposed within the receiving cavity 11 and extends along the first direction X. The battery unit 2 includes multiple battery cells 21 arranged along the first direction X. The multiple battery cells 2 are arranged along the second direction Y. One end of the battery cell 21 along the third direction Z has a top cover 23. The battery cell 21 is the basic electrochemical energy storage unit constituting the battery unit 2. The top cover 23 is the interface connecting with the first pressure strip 3 and the second pressure strip 4, facilitating the installation and fixation of the first pressure strip 3 and the second pressure strip 4.

[0030] The first pressure strip 3 is disposed within the receiving cavity 11. The first pressure strip 3 extends along the first direction X and connects the top cover 23 of at least two battery cells 21 in the same battery cell 2. In this way, each first pressure strip 3 can constrain the battery cells 21 in each battery cell 2, thereby improving the structural strength and modal characteristics inside the battery cell 2.

[0031] The second pressure strip 4 is disposed within the receiving cavity 11 and spaced apart from the first pressure strip 3. The second pressure strip 4 extends along the first direction X and connects two adjacent battery cells 2. The second pressure strip 4 is disposed on the top cover 23 of two adjacent battery cells 21 along the second direction Y. In this way, the second pressure strip 4 constrains the two adjacent battery cells 2, improving the structural strength and modal characteristics between each battery cell 2.

[0032] Based on the above structural configuration, the battery unit 2 is disposed within the receiving cavity 11 and extends along the first direction X. The battery unit 2 includes multiple battery cells 21 arranged along the first direction X. The multiple battery units 2 are arranged along the second direction Y, so all battery cells 21 are arranged in an array. One end of the battery cell 21 along the third direction Z has a top cover 23. A first pressure strip 3 is disposed within the receiving cavity 11. The first pressure strip 3 extends along the first direction X and connects the top covers 23 of at least two battery cells 21 in the same battery unit 2, forming a fixed connection between the battery cells 21 arranged along the first direction X. A second pressure strip 4 is disposed within the receiving cavity 11 and spaced apart from the first pressure strip 3. The second pressure strip 4 extends along the first direction X and connects two adjacent battery units 2. The second pressure strip 4 is disposed on the top covers 23 of two adjacent battery cells 21 arranged along the second direction Y, forming a fixed connection between the two adjacent battery cells 21 arranged along the second direction Y. Thus, the first pressure strip 3 connects each battery cell 21 of the same battery unit 2, improving the structural strength and modal characteristics between each battery cell 21 within the same battery unit 2. The second pressure strip 4 connects two adjacent battery cells 2, improving the structural strength and modal characteristics between the two adjacent battery cells 2, thereby improving the overall structural stability of the entire battery pack. Furthermore, both the first pressure strip 3 and the second pressure strip 4 are connected to the top cover 23 of the battery cell 21, which is equivalent to connecting the top covers 23 of multiple battery cells 21 into a whole. When a battery cell 21 experiences thermal runaway, the top cover 23 of the thermally runaway battery cell 21 will be subjected to the pulling force of the top covers 23 of other battery cells 21, thereby effectively preventing the top cover from exploding.

[0033] In some embodiments, there are multiple first pressure strips 3, and each first pressure strip 3 corresponds one-to-one with a battery cell 2. Specifically, there are multiple battery cells 2, and the number of first pressure strips 3 is equal to the number of battery cells 2, with each first pressure strip 3 disposed on one battery cell 2. This one-to-one correspondence between the first pressure strips 3 and the battery cells 2 helps improve the structural stability of all battery cells 2 in the entire pack.

[0034] In other embodiments, a battery cell 2 has multiple battery cells 21, and a first pressure strip 3 is connected to the top cover 23 of all battery cells 21 in the same battery cell 2. This arrangement can also improve the overall structural stability of the battery cell 2.

[0035] like Figure 3As shown, in some embodiments, a first adhesive layer 5 is also included, and each first pressure strip 3 is connected to the top cover 23 through the first adhesive layer 5. Thus, the first adhesive layer 5 serves as an interface material, achieving structural bonding between the first pressure strip 3 and the top cover 23 of the battery cell 21. The first adhesive layer 5 can absorb the shear stress generated by expansion or contraction during the charge-discharge cycle of the battery cell 21, preventing fretting wear between the first pressure strip 3 and the top cover 23. Specifically, the first adhesive layer 5 uses epoxy structural adhesive, which has advantages such as high shear strength, resistance to electrolyte corrosion, and adaptability to high vibration environments; or it uses silicone-based thermally conductive adhesive, which has the advantage of low elastic modulus and is easily deformable to adapt to the thermal deformation of the battery cell 21 during use.

[0036] In some embodiments, a groove is provided on the surface of the first pressure strip 3, and the first adhesive layer 5 is accommodated in the groove. When the first pressure strip 3 is connected to the top cover 23 of the battery cell 21, the thickness of the first adhesive layer 5 is controlled by the depth of the groove to meet different connection strength requirements.

[0037] like Figure 3 As shown, in some embodiments, a first sealing layer 6 is also included. The first sealing layer 6 is disposed between the first pressure strip 3 and the top cover 23, and is connected to both sides of the first adhesive layer 5 along the second direction Y. Thus, when the first pressure strip 3 is applied with the first adhesive layer 5 and fixed to the top cover 23, the first sealing layer 6 is located on both sides of the first adhesive layer 5 along the second direction Y, thereby preventing adhesive overflow from the first adhesive layer 5, maintaining an aesthetically pleasing appearance, and facilitating the installation of the first pressure strip 3. Specifically, the first sealing layer 6 is made of foam.

[0038] like Figure 3 As shown, in some embodiments, a second adhesive layer 7 is also included, through which the second pressure strip 4 is connected to the top cover 23. Thus, the second adhesive layer 7 serves as an interface material, achieving structural bonding between the second pressure strip 4 and the top cover 23 of the battery cell 21. The second adhesive layer 7 can absorb the shear stress generated by expansion or contraction during the charge-discharge cycle of the battery cell 21, preventing fretting wear between the second pressure strip 4 and the top cover 23. Specifically, the second adhesive layer 7 may be made of epoxy structural adhesive, which has advantages such as high shear strength, resistance to electrolyte corrosion, and adaptability to high vibration environments; or it may be made of silicone-based thermally conductive adhesive, which has the advantage of low elastic modulus and is easily deformable to adapt to the thermal deformation of the battery cell 21 during use.

[0039] like Figure 3As shown, in some embodiments, a second sealing layer 8 is also included; there is a gap between two adjacent battery cells 21 along the second direction Y in two adjacent battery cells 2, the second sealing layer 8 is disposed between the second pressure strip 4 and the top cover 23 and covers the gap, and the second adhesive layer 7 is located at least on both sides of the second sealing layer 8 along the second direction Y. Thus, when the second adhesive layer 7 is applied to the second pressure strip 4 and fixed to the top cover 23, the second sealing layer 8 is located between the second pressure strip 4 and the top cover 23 and covers the gap, thereby preventing the second adhesive layer 7 from flowing into the gap between the two adjacent battery cells 21, ensuring that the second adhesive layer 7 has sufficient adhesive content, and maintaining the connection and fixation between the second pressure strip 4 and the top cover 23. Specifically, the first sealing layer 6 is made of foam.

[0040] like Figure 1 and 2 As shown, in some embodiments, the thickness of the first pressure strip 3 is 'a', and the thickness of the second pressure strip 4 is 'b', satisfying a < b. The first pressure strip 3 constrains the individual battery cells 21 within each battery cell 2, while the second pressure strip 4 constrains adjacent battery cells 2. Therefore, the shear force bearing capacity of the second pressure strip 4 is greater than that of the first pressure strip 3. Given that the first pressure strip 3 and the second pressure strip 4 are made of the same material, the thickness of the second pressure strip 4 needs to be greater than that of the first pressure strip 3 to meet the requirements for improving structural modes and strength.

[0041] like Figure 3 As shown, in some embodiments, the battery cell 21 includes a housing 22 connected to a top cover 23, and the top cover 23 has two terminals 24. The top cover 23 of the battery cell 21 is a relatively weak area, and in the event of thermal runaway, the top cover may burst. Therefore, a first pressure strip 3 and a second pressure strip 4 need to be connected to the top cover 23 to improve structural mode and strength. Furthermore, the housing 22 has an explosion-proof valve 222. Since the explosion-proof valve 222 is no longer located on the top cover 23, a space can be reserved on the top cover 23 for connecting the first pressure strip 3.

[0042] like Figure 3 As shown, in some embodiments, the first pressure strip 3 is disposed between the two terminals 24 of the same battery cell 21. In this way, the first pressure strip 3 is located between the two terminals 24, avoiding direct contact with the terminals 24 to ensure safety in use, and utilizing the space between the two terminals 24 can improve space utilization.

[0043] like Figure 3 As shown, in some embodiments, the housing 22 has a bottom wall 221, which is disposed opposite to the top cover 23 in the third direction Z, and an explosion-proof valve 222 is disposed on the bottom wall 221. Thus, by distributing the explosion-proof valve 222 on the bottom wall 221, the material ejected from the explosion-proof valve 222 can be discharged in a direction away from the passenger compartment, avoiding impact on the passenger compartment and effectively improving safety.

[0044] Other embodiments of the present invention include electrical devices, including battery packs in some embodiments.

[0045] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A battery pack having a first direction (X), a second direction (Y), and a third direction (Z) that are perpendicular to each other, characterized in that, include: The box (1) has a receiving cavity (11); A battery cell (2) is disposed in the receiving cavity (11) and extends along the first direction (X). The battery cell (2) includes a plurality of battery cells (21) arranged along the first direction (X). The plurality of battery cells (2) are arranged along the second direction (Y). The battery cells (21) have a top cover (23) at one end along the third direction (Z). A first pressure strip (3) is disposed in the receiving cavity (11). The first pressure strip (3) extends along the first direction (X) and connects the top cover (23) of at least two battery cells (21) in the same battery cell (2). as well as The second pressure strip (4) is disposed in the receiving cavity (11) and spaced apart from the first pressure strip. The second pressure strip (4) extends along the first direction (X) and connects two adjacent battery cells (2). The second pressure strip (4) is disposed on the top cover (23) of two adjacent battery cells (21) along the second direction (Y).

2. The battery pack according to claim 1, characterized in that, It also includes a first adhesive layer (5); the number of first pressure strips (3) is the same as the number of battery units (2), and each battery unit (2) is provided with a first pressure strip (3); each first pressure strip (3) is connected to the top cover (23) through the first adhesive layer (5).

3. The battery pack according to claim 2, characterized in that, It also includes a first sealing layer (6), which is disposed between the first pressure strip (3) and the top cover (23), and the first sealing layer (6) is connected to both sides of the first adhesive layer (5) along the second direction (Y).

4. The battery pack according to claim 1 or 3, characterized in that, It also includes a second adhesive layer (7), through which the second pressure strip (4) is connected to the top cover (23).

5. The battery pack according to claim 4, characterized in that, It also includes a second sealing layer (8); There is a gap between two adjacent battery cells (21) along the second direction (Y) in two adjacent battery cells (2), the second sealing layer (8) is disposed between the second pressure strip (4) and the top cover (23) and covers the gap, and the second adhesive layer (7) is located at least on both sides of the second sealing layer (8) along the second direction (Y).

6. The battery pack according to claim 1, characterized in that, If the thickness of the first pressure strip (3) is a and the thickness of the second pressure strip (4) is b, then a < b.

7. The battery pack according to claim 1, characterized in that, The battery cell (21) includes a housing (22) connected to the top cover (23), the housing (22) having an explosion-proof valve (222), and the top cover (23) having two terminals (24).

8. The battery pack according to claim 7, characterized in that, The first pressure strip (3) is disposed between the two poles (24) of the same battery cell (21).

9. The battery pack according to claim 7, characterized in that, The housing (22) has a bottom wall (221) which is disposed opposite to the top cover (23) along the third direction (Z), and the explosion-proof valve (222) is disposed on the bottom wall (221).

10. An electrical device, characterized in that, Includes the battery pack as described in any one of claims 1-9.

Images