Battery devices and electrical equipment

Abstract

This application provides a battery device and an electrical appliance. The battery device includes at least two individual batteries. Each individual battery includes: a battery body having a first wall, and the battery body including terminals disposed on the first wall; an insulating liner covering the first wall, the insulating liner having a clearance hole and an opening extending along its thickness direction, wherein the terminals pass through the clearance hole and the first wall is exposed through the opening; insulating adhesive filling the opening; a busbar disposed on the side of the insulating liner facing away from the battery body and electrically connected to the terminals of the two individual batteries respectively; and a connecting strip disposed on the side of the insulating liner facing away from the battery body. The orthographic projection of the opening of the insulating liner of each individual battery on the first wall at least partially coincides with the connecting strip, and the first wall of each battery body and the connecting strip are connected by insulating adhesive. The battery device of this application is beneficial to improving the connection stability between the busbar and the terminals and reducing the occurrence of thermal runaway in the battery device.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery device and electrical equipment. Background Technology

[0002] In electric vehicles, energy storage systems, and other electronic devices, the battery pack serves as a core power supply component, and its performance and safety directly impact the reliability and efficiency of the entire system. A battery pack typically consists of multiple cells connected in series and / or parallel to meet specific voltage and capacity requirements.

[0003] During the connection of these battery cells, the welding quality between the terminals and the busbars is crucial. Because the battery generates heat during charging and discharging, the thermal expansion and contraction of the welded area can lead to fatigue and cracking at the weld joint. The welded areas are also susceptible to mechanical damage under the influence of external environmental factors such as vibration and impact.

[0004] If the welding between the terminal block and the busbar is damaged, it will cause thermal runaway of the battery pack, which may lead to the battery pack catching fire or even exploding, causing serious property damage and personal injury. Utility Model Content

[0005] In view of the above problems, this application provides a battery device and electrical equipment that improves the connection stability between the busbar and the terminal post.

[0006] This application provides a battery device, comprising: at least two single-cell batteries arranged side by side, each single-cell battery comprising: a battery body having a first wall, the battery body including terminals disposed on the first wall; an insulating liner covering the first wall, the insulating liner having a clearance hole and an opening extending along its own thickness direction, wherein the terminals pass through the clearance hole and the first wall is exposed through the opening; insulating adhesive filling the opening; and a busbar disposed on the side of the insulating liner facing away from the battery body, and electrically connected to the terminals of the two single-cell batteries respectively. A connecting strip is provided on the side of the insulating liner facing away from the battery body. The orthographic projection of the opening of the insulating liner of each individual battery cell onto the first wall at least partially coincides with the connecting strip. The first wall of each battery body and the connecting strip are connected by the insulating adhesive. The terminal post is welded to the busbar to form a solder mark. The area of ​​the end face of the terminal post facing the busbar is S1, the area of ​​the solder mark is S2, and the distance between the solder mark and the opening along the length of the first wall is a. S1, S2, and a satisfy 0.015 mm. -1 ≤S2 / (S1×a)≤0.09mm -1 .

[0007] Compared to traditional battery packs, the battery device of this application uses a busbar to weld and fix multiple individual battery cells to their terminals, forming an integral structure. Simultaneously, an opening is made in the insulating liner of each individual battery cell, and an insulating adhesive is used to directly fix a connecting strip to the first wall on the battery body. In other words, the connecting strip further secures the individual batteries, creating a double-fixed installation scheme that improves the connection stability between the busbar and the terminals on the battery body.

[0008] In addition, when the insulating adhesive inside the opening is used to fix the connecting strip to the first wall, part of the insulating adhesive also connects the insulating liner to the first wall. This improves the installation stability of the insulating liner and helps to prevent relative displacement between the terminal post passing through the clearance hole on the insulating liner and the insulating liner. This further improves the installation stability of the terminal post, thereby making the connection between the busbar and the terminal post stable and improving the safety of the battery device.

[0009] The stability of the connection between the busbar and the terminal post is improved by further limiting the value of S2 / (S1×a), which characterizes the relative position of the opening and the terminal post and the relative size of the solder mark. On the one hand, if S2 / (S1×a) is too large, that is, if the solder mark area S2 is too large or the distance between the solder mark and the opening is too small, the insulating adhesive is prone to melting during the welding of the terminal post and the busbar, causing a short circuit between the terminal post and the casing of the individual cell, resulting in the failure of the individual cell and affecting the normal use of the battery device. On the other hand, if S2 / (S1×a) is too small, that is, if the solder mark area S2 is too small or the distance between the solder mark and the opening is too large, the supplementary support provided by the connecting strip is insufficient, the connection stability between the terminal post and the busbar is poor, and welding failure is prone to occur when the battery is subjected to vibration. Furthermore, under these conditions, the current carrying capacity between the terminal post and the busbar is poor, and the battery device is prone to overheating during use. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is one of the partial structural schematic diagrams of the battery device according to an embodiment of this application;

[0012] Figure 2 This is a schematic diagram of the structure of a single battery cell in the battery device of this application embodiment;

[0013] Figure 3This is a second partial structural schematic diagram of the battery device according to an embodiment of this application;

[0014] Figure 4 This is a schematic diagram of the structure of the insulating liner according to an embodiment of this application;

[0015] Figure 5 This is a schematic diagram of the structure of the battery body according to an embodiment of this application.

[0016] Explanation of reference numerals in the attached figures:

[0017] 100-Battery Unit;

[0018] 101 - Individual cell; 102 - Busbar; 103 - Connecting strip;

[0019] 110 - Battery body; 111 - First wall; 112 - Terminal; 112a - Solder mark;

[0020] 120 - Insulating liner; 121 - Clearance hole; 122 - Opening;

[0021] 140 - Insulating adhesive. Detailed Implementation

[0022] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, 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 a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0023] Battery packs are typically composed of multiple cells connected in series and / or parallel to meet specific voltage and capacity requirements. During the connection of these cells, the welding quality between the terminals and the busbars is crucial. Because the battery generates heat during charging and discharging, the thermal expansion and contraction of the welded area can lead to fatigue and cracking at the weld joints. Under the influence of external environmental factors such as vibration and impact, the welded areas of the battery pack are also susceptible to mechanical damage.

[0024] If the welding between the terminal block and the busbar is damaged, it will cause thermal runaway of the battery pack, which may lead to the battery pack catching fire or even exploding, causing serious property damage and personal injury.

[0025] In view of this, this application provides a battery device and electrical equipment. Based on the provision of a busbar to connect the individual cells of the battery device, a connecting strip is provided to further connect the individual cells, which improves the installation stability between the individual cells, helps to evenly distribute the impact on the battery device, and thus improves the connection stability between the busbar and the terminal post.

[0026] For ease of explanation and understanding, please refer to... Figure 2 In this application, the length direction of the first wall can be the same as the length direction of the battery body, that is... Figure 2 In the X direction, the width direction of the first wall can be the same as the width direction of the battery body, that is... Figure 2 Y direction in, Figure 2 The Z direction can be the height direction of the battery body.

[0027] refer to Figures 1 to 5 In a first aspect, embodiments of this application provide a battery device 100, which may include at least two individual battery cells 101 arranged side by side, a busbar 102, and a connecting strip 103. The side-by-side direction of the individual battery cells 101 may be the thickness direction of the battery body 110, that is... Figure 2 Y direction shown.

[0028] Understandably, the number of individual cells 101 in the battery device of this application can be two or more, and the number of individual cells 101 can also be more than two, such as three, four, five, etc. The individual cells 101 are connected in series or in parallel.

[0029] The single cell 101 may include a cell body 110, an insulating liner 120, a busbar 102, and an insulating adhesive 140.

[0030] The battery body 110 may include a casing and battery cells. The casing may have a cavity for accommodating the battery cells. At least one end of the casing has an opening communicating with the cavity. For example, the opening may be located at one end of the casing, or the opening may be located at both opposite ends of the casing along the height (width / length) direction of the battery. The location of the opening is related to the battery cell arrangement, with the tabs on the battery cells facing the opening. The opening may be located on one side of the casing along the Z direction, or on one side of the casing along the Y direction. Of course, the opening 112 may also be located on one side along the X direction.

[0031] Understandably, the battery body 110 of this application can be a prismatic battery, and correspondingly, the cross-section of the casing is square and the casing opening is also square; or, the battery body 110 can be a cylindrical battery, and correspondingly, the cross-section of the casing is circular and the casing opening is also circular.

[0032] Optionally, the material of the housing may include at least one of aluminum, aluminum alloy, steel, copper, nickel, magnesium, and titanium, or the housing may also include other alloy materials.

[0033] The casing may contain a battery cell, and the cavity contains an electrolyte. During normal use of the battery body 110, the electrolyte continuously wets the battery cell, replenishing it. The battery cell may include a cell body, which is formed by winding or stacking a positive electrode, a negative electrode, and a separator disposed between them.

[0034] The positive electrode sheet may include a positive electrode current collector and a positive electrode active material. The positive electrode current collector may be made of metal materials such as aluminum foil, nickel foil, or stainless steel, or it may be a composite foil formed by combining metals and insulating materials. The positive electrode active material includes the main positive electrode material, conductive agent, and binder. Among them, the main positive electrode material includes one or more lithium-containing positive electrode active materials such as lithium iron phosphate, ternary materials containing nickel, cobalt, and manganese, and lithium manganese iron phosphate.

[0035] Similarly, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material. The negative electrode current collector may be made of metal materials such as copper foil, aluminum foil, or stainless steel, or it may be a composite foil formed by combining metals and insulating materials. The negative electrode active material may include a negative electrode active material, a conductive agent, and a binder. Among them, the negative electrode active material includes one or more of the following: artificial graphite, natural graphite, silicon carbide, silicon oxide, and lithium titanate.

[0036] The positive and negative electrode plates can be led out with positive and negative tabs, respectively, and the positive and negative tabs are connected to terminals 112. During the charging and discharging process of the battery device 100, the positive and negative tabs serve as current inlets and outlets, used to conduct electrical energy out of the battery cell, or to output external electrical energy into the battery cell for storage.

[0037] refer to Figure 2 and Figure 5 The battery body 110 has a first wall 111, which, exemplarily, is the top wall of the casing. The battery body 110 includes terminals 112 disposed on the first wall 111. Understandably, the first wall 111 can cover the casing opening. On the battery cell, the positive and negative terminals are led out towards the first wall 111 to facilitate connection with the terminals 112 disposed on the first wall 111, thereby forming a current channel and transmitting current.

[0038] refer to Figure 2 and Figure 4An insulating liner 120 is installed on the first wall 111 to provide electrical insulation and mechanical protection for the battery body 110, preventing external dust and other dirt from entering the battery body 110 and improving the service life of the battery body 110.

[0039] The insulating liner 120 has a clearance hole 121 and an opening 122 extending along its thickness direction, wherein the electrode post 112 passes through the clearance hole 121 and the first wall 111 is exposed from the opening 122. It can be understood that in this application, the battery bodies 110 of the multiple individual cells 101 of the battery device 100 can be electrically connected to each other through the busbar 102.

[0040] refer to Figure 1 and Figure 3 Busbar 102 is disposed on the side of insulating liner 120 facing away from battery body 110 and connected to terminal post 112. Exemplarily, busbar 102 can be welded to terminal post 112, or busbar 102 can be connected to terminal post 112 via conductive wire. In this way, the current can be collected and conducted among the multiple battery bodies 110 of battery device 100 through the collecting effect of busbar 102, which is beneficial to improve the power consumption of electrical devices equipped with the battery device 100 of this application or extend the battery life of electrical devices.

[0041] In this configuration, the battery bodies 110 of multiple individual battery cells 101 are electrically connected via busbars 102. Specifically, the terminals 112 at the same polarity end of each battery body 110 can be connected via busbars 102; that is, the positive terminal 112 of each battery body 110 is connected via busbar 102, and the negative terminal 112 is connected via another busbar 102. This parallel connection of the battery bodies 110 of the battery device 100 improves the battery capacity of the battery device 100, thereby extending the driving time of the electrical equipment. Furthermore, in this parallel connection, each battery body 110 can independently provide current to the battery device 100. Therefore, the total current output capability of the battery device 100 is the sum of the current output capabilities of each individual battery body 110. This allows the parallel-connected battery device 100 to meet the needs of high-power devices, such as the acceleration and hill-climbing scenarios of electric vehicles.

[0042] Alternatively, the terminals 112 at opposite polarities of the battery bodies 110 can be connected via busbars 102. That is, the positive terminal 112 of one battery body 110 is connected to the negative terminal 112 of the preceding battery body 110 via busbar 102, while the negative terminal 112 of that battery body 110 is connected to the positive terminal 112 of the following battery body 110 via another busbar 102. This series connection ensures that the battery bodies 110 of the battery device 100 have the same total voltage as all the battery bodies 110, thus meeting the high-voltage application requirements of electrical equipment. (Continue to refer to...) Figure 1 and Figure 3 The connecting strip 103 is located on the side of the insulating liner 120 facing away from the battery body 110. The orthographic projection of the opening 122 on the insulating liner 120 of each individual battery 101 onto the first wall 111 at least partially coincides with the connecting strip 103. In other words, along the height direction of the battery body 110 ( Figure 2 (As shown in the Z direction), at least a portion of the structure of the connecting strip 103 coincides with the opening 122. For example, a portion of the structure of the connecting strip 103 may coincide with the opening 122, or the connecting strip 103 may completely cover the opening 122. In this way, an additional connection channel is provided between the connecting strip 103 and the first wall 111 through the opening 122.

[0043] Insulating adhesive 140 fills the opening 122, and the first wall 111 and the connecting strip 103 are connected by insulating adhesive 140. On the one hand, the insulating adhesive 140 directly fixes the connecting strip 103 to the first wall 111, providing an additional fixing method besides the connection between the busbar 102 and the battery body 110 via the terminal post 112. This helps improve the connection stability between the busbar 102 and the battery body 110, thereby avoiding connection failure between the busbar 102 and the terminal post 112, reducing the possibility of thermal runaway in the battery body 110, and improving the safety of the battery device 100. On the other hand, the insulating adhesive 140 also prevents the formation of a current path between the first wall 111 and the busbar 102, which could lead to a short circuit failure in the battery body 110, thus improving the safety of the battery device 100 from another perspective.

[0044] Furthermore, when the insulating adhesive 140 inside the opening 122 is used to fix the busbar 102 to the first wall 111, a portion of the insulating adhesive 140 also connects the insulating liner 120 to the first wall 111.

[0045] This improves the installation stability of the insulating liner 120, helps to prevent relative displacement between the terminal post 112 passing through the clearance hole 121 on the insulating liner 120 and the insulating liner 120, thereby improving the installation stability of the terminal post 112, making the connection between the busbar 102 and the terminal post 112 stable, and improving the safety of the battery device 100.

[0046] Understandably, in this application, the busbar 102 can be arranged parallel to the connecting strip 103, extending along the thickness direction of the battery body 110, connecting multiple individual cells 101 of the battery device 100, thereby enhancing the structural stability of the battery device 100. Alternatively, the busbar 102 and the connecting strip 103 can also be an integral structure, connected by the terminal post 112 and double-fixed by the insulating adhesive 140, further enhancing the structural stability of the battery device 100. The terminal post 112 is welded to the busbar 102 to form a solder mark 112a.

[0047] The area of ​​the end face of the pole post 112 facing the busbar 102 is S1, and the area of ​​the solder mark 112a is S2, along the length direction of the first wall 111 ( Figure 2 (As shown in the X direction), the distance between solder mark 112a and opening 122 is a, and S1, S2 and a satisfy: 0.015mm -1 ≤S2 / (S1×a)≤0.09mm -1 For example, the value of S2 / (S1×a) can be 0.015mm. -1 0.03mm -1 0.045mm -1 0.06mm -1 0.075mm -1 Or 0.09mm -1 Of course, S2 / (S1×a) can also be other values, and designers can choose according to their needs. This application does not impose any restrictions on this.

[0048] On the one hand, to avoid S2 / (S1×a) being too large, the insulating adhesive 140 may melt during the welding of the terminal 112 and the busbar 102, causing a short circuit between the terminal 112 and the casing of the individual battery 101, leading to the failure of the individual battery 101 and affecting the normal use of the battery device 100. On the other hand, to avoid S2 / (S1×a) being too small, the reinforcing effect of the connecting strip 103 on the stability of the connection between the busbar 102 and the terminal 112 will be weak, resulting in poor connection stability between the terminal 112 and the busbar 102. When the battery is subjected to vibration, welding failure may easily occur. Furthermore, under these conditions, the current carrying capacity between the terminal 112 and the busbar 102 will be poor, and the battery device 100 may easily overheat during use.

[0049] Compared to traditional battery packs, the battery device 100 of this application is fixed to the terminals of multiple individual battery cells 101 by welding a busbar 102, thereby forming an integral structure of multiple individual battery cells 101. Simultaneously, an opening 122 is formed on the insulating liner 120 of each individual battery cell 101, and an insulating adhesive 140 is used to directly fix the connecting strip 103 to the first wall 111 on the battery body 110. In other words, the connecting strip 103 further fixes the individual battery cells 101 relative to each other, forming a double-fixed installation scheme. This improves the installation stability between the individual battery cells 101, helps to evenly distribute the impact force received by the battery device 100, and further improves the connection stability between the busbar 102 and the terminals 112 on the battery body 110.

[0050] Furthermore, when the insulating adhesive 140 inside the opening 122 is used to fix the connecting strip 103 to the first wall 111, part of the insulating adhesive 140 connects the insulating liner 120 to the first wall 111. This improves the installation stability of the insulating liner 120 and helps to prevent relative displacement between the terminal post 112 passing through the clearance hole on the insulating liner 120 and the insulating liner 120. This further improves the installation stability of the terminal post 112, thereby making the connection between the busbar 102 and the terminal post 112 stable and improving the safety of the battery device 100.

[0051] The stability of the connection between the busbar 102 and the pole post 112 is improved by further defining the value of S2 / (S1×a) which represents the relative position of the opening 122 and the pole post 112 and the relative size of the solder mark 112a.

[0052] According to some embodiments of this application, the busbar 102 can be an aluminum busbar. Aluminum has a low density, and compared to steel, aluminum busbars can significantly reduce the overall weight of the battery device 100. This is particularly important for weight-sensitive applications such as electric vehicles, helping to improve the energy efficiency and range of the device. Simultaneously, aluminum has good thermal conductivity, enabling effective heat dissipation. This is highly beneficial for the thermal management of the battery device 100, helping to reduce the risk of thermal runaway and improve the safety and reliability of the system.

[0053] Furthermore, S1, S2, and a satisfy: 0.018mm -1 ≤S2 / (S1×a)≤0.09mm -1 ,

[0054] For example, the value of S2 / (S1×a) can be 0.018mm. -1 0.03mm -1 0.045mm -1 0.06mm -10.075mm -1 Or 0.09mm -1 Of course, S2 / (S1×a) can also be other values, and designers can choose according to their needs. This application does not impose any restrictions on this. In this embodiment, since the busbar 102 is an aluminum busbar, the melting point of aluminum is low, and the heat required for welding is small. Thus, on the one hand, the area of ​​the solder mark 112a can be appropriately increased to improve the connection stability between the terminal post 112 and the busbar 102. On the other hand, since the welding temperature is low at this time, the distance a between the connection position of the terminal post 112 and the busbar 102 and the opening 122 can be appropriately reduced to improve the contribution of the insulating adhesive 140 to the installation of the terminal post 112 and the connection stability between the busbar 102 and the battery body.

[0055] In summary, when the busbar 102 is made of aluminum, the lower limit of S2 / (S1×a) can be appropriately increased to improve the connection stability between the busbar 102 and the pole post 112.

[0056] According to some embodiments of this application, the busbar 102 can be a copper busbar. Copper has extremely high electrical conductivity and is one of the best conductors among commonly used metals. This makes the copper busbar highly efficient in current conduction, minimizing power loss and improving the overall efficiency of the battery device 100. Simultaneously, copper not only has excellent electrical conductivity but also high thermal conductivity. This means that the copper busbar can effectively dissipate heat, aiding in the thermal management of the battery device 100 and reducing the risk of localized overheating and thermal runaway. Furthermore, the welding and connection between the copper busbar and other metals (such as the terminal post 112) are generally reliable, forming a stable electrical connection and reducing contact resistance.

[0057] Furthermore, S1, S2, and a satisfy: 0.015mm -1 ≤S2 / (S1×a)≤0.085mm -1 For example, the value of S2 / (S1×a) can be 0.015mm. -1 0.03mm -1 0.045mm -1 0.06mm -1 0.075mm -1 Or 0.085mm -1Of course, S2 / (S1×a) can also be other values, and designers can choose according to their needs. This application does not impose any restrictions on this. In this embodiment, since the busbar 102 is a copper busbar, and since the connection strength between the copper busbar and the terminal 112 is relatively high, the welding area of ​​the solder mark 112a can be appropriately reduced. Therefore, when the busbar 102 is a copper busbar, the upper limit of S2 / (S1×a) can be appropriately reduced, which can improve production efficiency while ensuring the connection stability between the busbar 102 and the terminal 112.

[0058] Understandably, in this application, the area S1 of the end face of the pole 112 facing the busbar 102 can satisfy 70mm². 2 ≤S1≤620mm 2 For example, the area of ​​S1 can be 70 mm². 2 100mm 2 200mm 2 300mm 2 400mm 2 500mm 2 600mm 2 Or 620mm 2 Of course, S1 can also be other values, and this application does not impose any restrictions on this.

[0059] This design ensures that the terminal 112 has a suitable welding area. On the one hand, it avoids S1 being too large, which would cause the terminal 112 to occupy too much lateral (Y direction) space of the insulating liner 120, resulting in an excessively large terminal 112 and an unstable connection with the battery body 110. On the other hand, it avoids S1 being too small, which would result in a small area available for welding between the terminal 112 and the busbar 102, poor current carrying capacity of the terminal 112, and a tendency to overheat, thus affecting the performance of the battery device 100.

[0060] The area S2 of solder mark 112a can meet the requirement of 20mm. 2 ≤S2≤190mm 2 For example, the area of ​​S1 can be 20 mm². 2 60mm 2 100mm 2 120mm 2 160mm 2 Or 190mm 2 Of course, S2 can also be other values, and this application does not impose any restrictions on this.

[0061] With the end face area S1 of the terminal 112 relatively fixed, the relative size of the area S2 of the solder mark 112a can characterize the area of ​​the welding region between the terminal 112 and the busbar 102. The larger S2 is, the larger the welding region between the terminal 112 and the busbar 102, and the more stable the connection between the terminal 112 and the busbar 102. However, conversely, when welding between the busbar 102 and the terminal 112, a larger solder mark 112a area S2 generates more welding heat, which can easily cause the insulating adhesive 140 of the opening 122 to melt. At this time, the insulation effect between the shell and the terminal 112 is poor, which may lead to a short circuit between the terminal 112 and the shell, causing the battery device 100 to fail. The smaller S2 is, the smaller the current flow area between the terminal 112 and the busbar 102, and the more prone the battery device 100 is to thermal runaway. Preferably, S2 / S1 can satisfy: 0.2≤S2 / S1≤0.4, which takes into account the current carrying capacity of the pole 112 while avoiding the formation of excessive solder marks 112a, and avoiding the generation of large heat when the pole 112 is welded to the busbar 102, which would cause the insulating adhesive 140 to fail.

[0062] The distance 'a' between the connection point of the pole 112 and the busbar 102 and the opening 122 can satisfy 4mm ≤ a ≤ 22mm. For example, a can be 4mm, 8mm, 12mm, 16mm, 20mm, or 22mm. Of course, a can also be other values, and this application does not limit this.

[0063] The size of the distance 'a' between the connection point of the terminal post 112 and the busbar 102 and the opening 122 is related to the contribution of the insulating adhesive 140 to the installation stability of the terminal post 112: the larger 'a' is, the farther the distance between the opening 122 and the terminal post 112 is. In fact, when the terminal post 112 shakes or shifts, the insulating adhesive 140 contributes little to improving the stability of the terminal post 112. The smaller 'a' is, the closer the distance between the opening 122 and the terminal post 112 is. Correspondingly, the insulating adhesive 140 contributes more to improving the connection stability between the terminal post 112 and the busbar 102. However, the closer the relative position between the opening 122 and the terminal post 112, the more likely the heat generated during welding of the busbar 102 and the terminal post 112 may be conducted to the insulating adhesive 140 in the opening 122, causing the insulating adhesive 140 to melt and potentially causing a short circuit between the terminal post 112 and the first wall 111.

[0064] Therefore, the stability of the connection between the busbar 102 and the pole post 112 is measured by the value of S2 / (S1×a), which takes into account the relative positions of the opening 122 and the pole post 112 and the relative size of the solder mark 112a.

[0065] refer to Figure 2 , Figure 3 and Figure 4 In some embodiments, there can be multiple openings 122. For example, there can be two, three, or four openings 122. Of course, the number of openings 122 can be selected by the designer according to the needs, and this application does not limit this. By setting multiple openings 122, the connection between the connecting strip 103 and the first wall 111 is more stable, forming a multi-point connection structure. When the battery device 100 is subjected to impact, it is beneficial to distribute and transmit the force evenly, thereby improving the connection stability between the busbar 102 and the terminal post 112.

[0066] Multiple openings 122 can be along the length direction of the first wall 111 ( Figure 2 The openings 122 are arranged at intervals in the X direction shown, or the multiple openings 122 can also be arranged along the width direction of the first wall 111. Figure 2 The openings 122 can be arranged at intervals along the Y direction (as shown), or multiple openings 122 can be arranged at intervals along both the length and width directions of the first wall 111 to form an array structure. In this way, the designer can set the position of the openings 122 as needed, so that the busbar 102 can be connected to the first wall 111 at different positions, providing greater flexibility and redundancy.

[0067] The projections of multiple openings 122 on the first wall 111 all coincide with the connecting strip 103. This ensures that the insulating adhesive 140 inside the openings 122 can provide a connection between the connecting strip 103 and the first wall 111, thereby improving the reliability of the connection between the connecting strip 103 and the first wall 111.

[0068] refer to Figure 4 According to some embodiments of this application, a plurality of openings 122 are arranged at intervals along the width direction of the first wall 111. Along the width direction of the first wall 111, the ratio of the sum of the widths b of the plurality of openings 122 to the width c of the insulating liner 120 satisfies: 0.55 ≤ b / c ≤ 0.8. For example, b / c can be 0.55, 0.6, 0.65, 0.7, 0.75, or 0.8. Of course, b / c can also be other values, which designers can choose according to their needs; this application does not impose any restrictions on this. On the one hand, this avoids the ratio b / c of ​​the sum of the widths b of the plurality of openings 122 to the width c of the insulating liner 120 being too small. In this case, the total area of ​​the openings 122 is small, the connection area between the busbar 102 and the first wall 111 is small, and the contribution to improving the connection stability between the busbar 102 and the pole post 112 is small. On the other hand, to avoid the ratio b / c of ​​the sum of the widths b of the multiple openings 122 to the width c of the insulating liner 120 being too large, the insulating adhesive 140 will have a large distribution area in the width direction of the insulating liner 120, which is easily affected by the heat during the welding of the busbar 102 and the pole post 112, resulting in poor insulation between the busbar 102 and the first wall 111.

[0069] The width c of the insulating liner 120 can satisfy the following condition: 15mm ≤ c ≤ 85mm. For example, c can be 15mm, 30mm, 45mm, 60mm, 75mm, or 85mm. Of course, b can also be other values, which designers can choose according to their needs; this application does not impose any restrictions on this. By setting a suitable width c of the insulating liner 120, the compatibility between the insulating liner 120 and the battery body 110 is improved, thereby enhancing the structural stability of the battery device 100.

[0070] The sum of the widths b of the multiple openings 122 can satisfy: 8mm ≤ b ≤ 75mm. For example, b can be 8mm, 15mm, 30mm, 45mm, 60mm, or 75mm. Of course, b can also be other values, which designers can choose according to their needs; this application does not impose any restrictions on this. On the one hand, this avoids the openings 122 occupying too large a width of the insulating liner 120, which would reduce the structural strength of the insulating liner 120. Simultaneously, the insulating adhesive 140 filled within the openings 122 is more susceptible to the welding process between the pole post 112 and the busbar 102, and is prone to melting due to heat. On the other hand, this avoids the total size of the openings 122 being too small, resulting in poor connection stability between the connecting strip 103 and the first wall 111. (Reference) Figure 1 , Figure 2 , Figure 3 and Figure 4 In some embodiments, there can be two poles 112, corresponding to the positive and negative poles of the battery body 110 respectively. The busbar 102 and the connecting strip 103 are two poles corresponding to the poles 112. There are two sets of openings 122 corresponding to the connecting strips 103. Each set is located on the side of the pole 112 away from the other pole 112. In other words, the opening 122 can be located on the side of the pole 112 facing outward from the battery body 110 along the X direction. In this way, the connecting strip 103 and the first wall 111 are bonded by the insulating adhesive 140 in the opening 122, forming a larger connection surface, which is beneficial to improving the connection stability between the connecting strip 103 and the first wall 111.

[0071] According to some embodiments of this application, the solder mark 112a can be circular, forming a circular solder pool during welding, which facilitates welding, requires less welding heat, avoids the welding heat affecting the insulating adhesive 140, and provides good insulation between the busbar 102 and the first wall 111.

[0072] Of course, the solder mark 112a can also be square. A square solder mark 112a corresponds to a large welding area and has good welding strength between the busbar 102 and the pole post 112.

[0073] refer to Figure 2In some embodiments, the end face of the terminal post 112 facing the busbar 102 is higher than the side surface of the insulating liner 120 facing away from the battery body 110. In other words, along the Z direction, the top end of the terminal post 112 protrudes from the upper end face of the insulating liner 120. This avoids interference between the insulating liner 120 and the busbar 102 when the busbar 102 is welded to the terminal post 112, which helps to improve the structural reliability of the battery device 100.

[0074] The thickness of the insulating adhesive 140 is greater than the depth of the opening 122, so that both sides of the insulating adhesive 140 along the Z direction can extend beyond the two sides of the insulating liner 120 along the Z direction, thereby ensuring the reliability of the connection between the busbar 102 and the first wall 111.

[0075] Secondly, embodiments of this application provide an electrical device including the battery device 100 described above.

[0076] The electrical equipment of this application, due to the use of the aforementioned battery device 100, has a higher connection stability between the busbar 102 and the terminal post 112 on the battery body 110 during use, which helps to avoid thermal runaway and failure of the battery device 100, and improves the safety of the electrical equipment.

[0077] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0078] It should be noted that the embodiments referred to in the specification, such as "one embodiment," "embodiment," "exemplary embodiment," and "some embodiments," may include specific features, structures, or characteristics, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0079] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0080] It should be readily understood that the terms “on,” “above,” and “on top of” in this disclosure should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on top of something” but also “on top of something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery device, characterized in that, include: At least two individual cells arranged side by side, the individual cells comprising: A battery body having a first wall, the battery body including terminals disposed on the first wall; An insulating liner is provided on the first wall. The insulating liner has a clearance hole and an opening that extend through the thickness direction. The pole is inserted through the clearance hole, and the first wall is exposed through the opening. Insulating adhesive is used to fill the opening; A busbar is located on the side of the insulating liner facing away from the battery body and is electrically connected to the terminals of the two individual batteries respectively. A connecting strip is provided on the side of the insulating liner facing away from the battery body. The orthographic projection of the opening of the insulating liner of each individual battery on the first wall at least partially coincides with the connecting strip. The first wall of each battery body and the connecting strip are connected by the insulating adhesive. The electrode post is welded to the busbar to form a solder mark. The area of ​​the end face of the electrode post facing the busbar is S1, and the area of ​​the solder mark is S2. The distance between the solder mark and the opening along the length of the first wall is a. S1, S2, and a satisfy 0.015 mm. -1 ≤S2 / (S1×a)≤0.09mm -1 .

2. The battery device according to claim 1, characterized in that, The busbar is made of aluminum.

3. The battery device according to claim 2, characterized in that, S1, S2, and a satisfy: 0.018mm -1 ≤S2 / (S1×a)≤0.09mm -1 .

4. The battery device according to claim 1, characterized in that, The busbar is a copper busbar.

5. The battery device according to claim 4, characterized in that, S1, S2, and a satisfy: 0.015mm -1 ≤S2 / (S1×a)≤0.085mm -1 .

6. The battery device according to any one of claims 1-5, characterized in that, The openings are multiple, and the multiple openings are arranged at intervals along the length and / or width direction of the first wall. The projections of the multiple openings on the first wall all coincide with the connecting strip.

7. The battery device according to claim 6, characterized in that, The plurality of openings are arranged at intervals along the width direction of the first wall. Along the width direction of the first wall, the ratio of the sum of the widths b of the plurality of openings to the width c of the insulating liner satisfies: 0.55 ≤ b / c ≤ 0.

8.

8. The battery device according to any one of claims 1-5, characterized in that, There are two pole posts, and the busbar and the connecting strip are both two corresponding to the pole posts. The openings are two sets corresponding to the connecting strip, each set being located on the side of the pole away from the other pole.

9. The battery device according to any one of claims 2-5, characterized in that, The solder mark is circular or square.

10. The battery device according to any one of claims 1-5, characterized in that, The end face of the terminal post facing the busbar is higher than the side surface of the insulating liner facing away from the battery body. The thickness of the insulating adhesive is greater than the depth of the opening.

11. An electrical appliance, characterized in that, The battery device includes any one of claims 1-10.

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